diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 13:15:26 +0000 |
| commit | 82539ad8d59729fb45b0bb0edda8f2bddb719eb1 (patch) | |
| tree | 58f0b58e6f44f0e04d4a6373132cf426fa835fa7 /src/image | |
| parent | Initial commit. (diff) | |
| download | golang-1.17-upstream.tar.xz golang-1.17-upstream.zip | |
Adding upstream version 1.17.13.upstream/1.17.13upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/image')
167 files changed, 19711 insertions, 0 deletions
diff --git a/src/image/color/color.go b/src/image/color/color.go new file mode 100644 index 0000000..8895839 --- /dev/null +++ b/src/image/color/color.go @@ -0,0 +1,347 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package color implements a basic color library. +package color + +// Color can convert itself to alpha-premultiplied 16-bits per channel RGBA. +// The conversion may be lossy. +type Color interface { + // RGBA returns the alpha-premultiplied red, green, blue and alpha values + // for the color. Each value ranges within [0, 0xffff], but is represented + // by a uint32 so that multiplying by a blend factor up to 0xffff will not + // overflow. + // + // An alpha-premultiplied color component c has been scaled by alpha (a), + // so has valid values 0 <= c <= a. + RGBA() (r, g, b, a uint32) +} + +// RGBA represents a traditional 32-bit alpha-premultiplied color, having 8 +// bits for each of red, green, blue and alpha. +// +// An alpha-premultiplied color component C has been scaled by alpha (A), so +// has valid values 0 <= C <= A. +type RGBA struct { + R, G, B, A uint8 +} + +func (c RGBA) RGBA() (r, g, b, a uint32) { + r = uint32(c.R) + r |= r << 8 + g = uint32(c.G) + g |= g << 8 + b = uint32(c.B) + b |= b << 8 + a = uint32(c.A) + a |= a << 8 + return +} + +// RGBA64 represents a 64-bit alpha-premultiplied color, having 16 bits for +// each of red, green, blue and alpha. +// +// An alpha-premultiplied color component C has been scaled by alpha (A), so +// has valid values 0 <= C <= A. +type RGBA64 struct { + R, G, B, A uint16 +} + +func (c RGBA64) RGBA() (r, g, b, a uint32) { + return uint32(c.R), uint32(c.G), uint32(c.B), uint32(c.A) +} + +// NRGBA represents a non-alpha-premultiplied 32-bit color. +type NRGBA struct { + R, G, B, A uint8 +} + +func (c NRGBA) RGBA() (r, g, b, a uint32) { + r = uint32(c.R) + r |= r << 8 + r *= uint32(c.A) + r /= 0xff + g = uint32(c.G) + g |= g << 8 + g *= uint32(c.A) + g /= 0xff + b = uint32(c.B) + b |= b << 8 + b *= uint32(c.A) + b /= 0xff + a = uint32(c.A) + a |= a << 8 + return +} + +// NRGBA64 represents a non-alpha-premultiplied 64-bit color, +// having 16 bits for each of red, green, blue and alpha. +type NRGBA64 struct { + R, G, B, A uint16 +} + +func (c NRGBA64) RGBA() (r, g, b, a uint32) { + r = uint32(c.R) + r *= uint32(c.A) + r /= 0xffff + g = uint32(c.G) + g *= uint32(c.A) + g /= 0xffff + b = uint32(c.B) + b *= uint32(c.A) + b /= 0xffff + a = uint32(c.A) + return +} + +// Alpha represents an 8-bit alpha color. +type Alpha struct { + A uint8 +} + +func (c Alpha) RGBA() (r, g, b, a uint32) { + a = uint32(c.A) + a |= a << 8 + return a, a, a, a +} + +// Alpha16 represents a 16-bit alpha color. +type Alpha16 struct { + A uint16 +} + +func (c Alpha16) RGBA() (r, g, b, a uint32) { + a = uint32(c.A) + return a, a, a, a +} + +// Gray represents an 8-bit grayscale color. +type Gray struct { + Y uint8 +} + +func (c Gray) RGBA() (r, g, b, a uint32) { + y := uint32(c.Y) + y |= y << 8 + return y, y, y, 0xffff +} + +// Gray16 represents a 16-bit grayscale color. +type Gray16 struct { + Y uint16 +} + +func (c Gray16) RGBA() (r, g, b, a uint32) { + y := uint32(c.Y) + return y, y, y, 0xffff +} + +// Model can convert any Color to one from its own color model. The conversion +// may be lossy. +type Model interface { + Convert(c Color) Color +} + +// ModelFunc returns a Model that invokes f to implement the conversion. +func ModelFunc(f func(Color) Color) Model { + // Note: using *modelFunc as the implementation + // means that callers can still use comparisons + // like m == RGBAModel. This is not possible if + // we use the func value directly, because funcs + // are no longer comparable. + return &modelFunc{f} +} + +type modelFunc struct { + f func(Color) Color +} + +func (m *modelFunc) Convert(c Color) Color { + return m.f(c) +} + +// Models for the standard color types. +var ( + RGBAModel Model = ModelFunc(rgbaModel) + RGBA64Model Model = ModelFunc(rgba64Model) + NRGBAModel Model = ModelFunc(nrgbaModel) + NRGBA64Model Model = ModelFunc(nrgba64Model) + AlphaModel Model = ModelFunc(alphaModel) + Alpha16Model Model = ModelFunc(alpha16Model) + GrayModel Model = ModelFunc(grayModel) + Gray16Model Model = ModelFunc(gray16Model) +) + +func rgbaModel(c Color) Color { + if _, ok := c.(RGBA); ok { + return c + } + r, g, b, a := c.RGBA() + return RGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)} +} + +func rgba64Model(c Color) Color { + if _, ok := c.(RGBA64); ok { + return c + } + r, g, b, a := c.RGBA() + return RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func nrgbaModel(c Color) Color { + if _, ok := c.(NRGBA); ok { + return c + } + r, g, b, a := c.RGBA() + if a == 0xffff { + return NRGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), 0xff} + } + if a == 0 { + return NRGBA{0, 0, 0, 0} + } + // Since Color.RGBA returns an alpha-premultiplied color, we should have r <= a && g <= a && b <= a. + r = (r * 0xffff) / a + g = (g * 0xffff) / a + b = (b * 0xffff) / a + return NRGBA{uint8(r >> 8), uint8(g >> 8), uint8(b >> 8), uint8(a >> 8)} +} + +func nrgba64Model(c Color) Color { + if _, ok := c.(NRGBA64); ok { + return c + } + r, g, b, a := c.RGBA() + if a == 0xffff { + return NRGBA64{uint16(r), uint16(g), uint16(b), 0xffff} + } + if a == 0 { + return NRGBA64{0, 0, 0, 0} + } + // Since Color.RGBA returns an alpha-premultiplied color, we should have r <= a && g <= a && b <= a. + r = (r * 0xffff) / a + g = (g * 0xffff) / a + b = (b * 0xffff) / a + return NRGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func alphaModel(c Color) Color { + if _, ok := c.(Alpha); ok { + return c + } + _, _, _, a := c.RGBA() + return Alpha{uint8(a >> 8)} +} + +func alpha16Model(c Color) Color { + if _, ok := c.(Alpha16); ok { + return c + } + _, _, _, a := c.RGBA() + return Alpha16{uint16(a)} +} + +func grayModel(c Color) Color { + if _, ok := c.(Gray); ok { + return c + } + r, g, b, _ := c.RGBA() + + // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same + // as those given by the JFIF specification and used by func RGBToYCbCr in + // ycbcr.go. + // + // Note that 19595 + 38470 + 7471 equals 65536. + // + // The 24 is 16 + 8. The 16 is the same as used in RGBToYCbCr. The 8 is + // because the return value is 8 bit color, not 16 bit color. + y := (19595*r + 38470*g + 7471*b + 1<<15) >> 24 + + return Gray{uint8(y)} +} + +func gray16Model(c Color) Color { + if _, ok := c.(Gray16); ok { + return c + } + r, g, b, _ := c.RGBA() + + // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same + // as those given by the JFIF specification and used by func RGBToYCbCr in + // ycbcr.go. + // + // Note that 19595 + 38470 + 7471 equals 65536. + y := (19595*r + 38470*g + 7471*b + 1<<15) >> 16 + + return Gray16{uint16(y)} +} + +// Palette is a palette of colors. +type Palette []Color + +// Convert returns the palette color closest to c in Euclidean R,G,B space. +func (p Palette) Convert(c Color) Color { + if len(p) == 0 { + return nil + } + return p[p.Index(c)] +} + +// Index returns the index of the palette color closest to c in Euclidean +// R,G,B,A space. +func (p Palette) Index(c Color) int { + // A batch version of this computation is in image/draw/draw.go. + + cr, cg, cb, ca := c.RGBA() + ret, bestSum := 0, uint32(1<<32-1) + for i, v := range p { + vr, vg, vb, va := v.RGBA() + sum := sqDiff(cr, vr) + sqDiff(cg, vg) + sqDiff(cb, vb) + sqDiff(ca, va) + if sum < bestSum { + if sum == 0 { + return i + } + ret, bestSum = i, sum + } + } + return ret +} + +// sqDiff returns the squared-difference of x and y, shifted by 2 so that +// adding four of those won't overflow a uint32. +// +// x and y are both assumed to be in the range [0, 0xffff]. +func sqDiff(x, y uint32) uint32 { + // The canonical code of this function looks as follows: + // + // var d uint32 + // if x > y { + // d = x - y + // } else { + // d = y - x + // } + // return (d * d) >> 2 + // + // Language spec guarantees the following properties of unsigned integer + // values operations with respect to overflow/wrap around: + // + // > For unsigned integer values, the operations +, -, *, and << are + // > computed modulo 2n, where n is the bit width of the unsigned + // > integer's type. Loosely speaking, these unsigned integer operations + // > discard high bits upon overflow, and programs may rely on ``wrap + // > around''. + // + // Considering these properties and the fact that this function is + // called in the hot paths (x,y loops), it is reduced to the below code + // which is slightly faster. See TestSqDiff for correctness check. + d := x - y + return (d * d) >> 2 +} + +// Standard colors. +var ( + Black = Gray16{0} + White = Gray16{0xffff} + Transparent = Alpha16{0} + Opaque = Alpha16{0xffff} +) diff --git a/src/image/color/color_test.go b/src/image/color/color_test.go new file mode 100644 index 0000000..ea66b7b --- /dev/null +++ b/src/image/color/color_test.go @@ -0,0 +1,47 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package color + +import ( + "testing" + "testing/quick" +) + +func TestSqDiff(t *testing.T) { + // canonical sqDiff implementation + orig := func(x, y uint32) uint32 { + var d uint32 + if x > y { + d = uint32(x - y) + } else { + d = uint32(y - x) + } + return (d * d) >> 2 + } + testCases := []uint32{ + 0, + 1, + 2, + 0x0fffd, + 0x0fffe, + 0x0ffff, + 0x10000, + 0x10001, + 0x10002, + 0xfffffffd, + 0xfffffffe, + 0xffffffff, + } + for _, x := range testCases { + for _, y := range testCases { + if got, want := sqDiff(x, y), orig(x, y); got != want { + t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want) + } + } + } + if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil { + t.Fatal(err) + } +} diff --git a/src/image/color/palette/gen.go b/src/image/color/palette/gen.go new file mode 100644 index 0000000..7bb257d --- /dev/null +++ b/src/image/color/palette/gen.go @@ -0,0 +1,122 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:build ignore +// +build ignore + +package main + +// This program generates palette.go. Invoke it as +// go run gen.go -output palette.go + +import ( + "bytes" + "flag" + "fmt" + "go/format" + "io" + "log" + "os" +) + +var filename = flag.String("output", "palette.go", "output file name") + +func main() { + flag.Parse() + + var buf bytes.Buffer + + fmt.Fprintln(&buf, `// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file.`) + fmt.Fprintln(&buf) + fmt.Fprintln(&buf, "// Code generated by go run gen.go -output palette.go; DO NOT EDIT.") + fmt.Fprintln(&buf) + fmt.Fprintln(&buf, "package palette") + fmt.Fprintln(&buf) + fmt.Fprintln(&buf, `import "image/color"`) + fmt.Fprintln(&buf) + printPlan9(&buf) + printWebSafe(&buf) + + data, err := format.Source(buf.Bytes()) + if err != nil { + log.Fatal(err) + } + err = os.WriteFile(*filename, data, 0644) + if err != nil { + log.Fatal(err) + } +} + +func printPlan9(w io.Writer) { + c, lines := [3]int{}, [256]string{} + for r, i := 0, 0; r != 4; r++ { + for v := 0; v != 4; v, i = v+1, i+16 { + for g, j := 0, v-r; g != 4; g++ { + for b := 0; b != 4; b, j = b+1, j+1 { + den := r + if g > den { + den = g + } + if b > den { + den = b + } + if den == 0 { + c[0] = 0x11 * v + c[1] = 0x11 * v + c[2] = 0x11 * v + } else { + num := 17 * (4*den + v) + c[0] = r * num / den + c[1] = g * num / den + c[2] = b * num / den + } + lines[i+(j&0x0f)] = + fmt.Sprintf("\tcolor.RGBA{0x%02x, 0x%02x, 0x%02x, 0xff},", c[0], c[1], c[2]) + } + } + } + } + fmt.Fprintln(w, "// Plan9 is a 256-color palette that partitions the 24-bit RGB space") + fmt.Fprintln(w, "// into 4×4×4 subdivision, with 4 shades in each subcube. Compared to the") + fmt.Fprintln(w, "// WebSafe, the idea is to reduce the color resolution by dicing the") + fmt.Fprintln(w, "// color cube into fewer cells, and to use the extra space to increase the") + fmt.Fprintln(w, "// intensity resolution. This results in 16 gray shades (4 gray subcubes with") + fmt.Fprintln(w, "// 4 samples in each), 13 shades of each primary and secondary color (3") + fmt.Fprintln(w, "// subcubes with 4 samples plus black) and a reasonable selection of colors") + fmt.Fprintln(w, "// covering the rest of the color cube. The advantage is better representation") + fmt.Fprintln(w, "// of continuous tones.") + fmt.Fprintln(w, "//") + fmt.Fprintln(w, "// This palette was used in the Plan 9 Operating System, described at") + fmt.Fprintln(w, "// https://9p.io/magic/man2html/6/color") + fmt.Fprintln(w, "var Plan9 = []color.Color{") + for _, line := range lines { + fmt.Fprintln(w, line) + } + fmt.Fprintln(w, "}") + fmt.Fprintln(w) +} + +func printWebSafe(w io.Writer) { + lines := [6 * 6 * 6]string{} + for r := 0; r < 6; r++ { + for g := 0; g < 6; g++ { + for b := 0; b < 6; b++ { + lines[36*r+6*g+b] = + fmt.Sprintf("\tcolor.RGBA{0x%02x, 0x%02x, 0x%02x, 0xff},", 0x33*r, 0x33*g, 0x33*b) + } + } + } + fmt.Fprintln(w, "// WebSafe is a 216-color palette that was popularized by early versions") + fmt.Fprintln(w, "// of Netscape Navigator. It is also known as the Netscape Color Cube.") + fmt.Fprintln(w, "//") + fmt.Fprintln(w, "// See https://en.wikipedia.org/wiki/Web_colors#Web-safe_colors for details.") + fmt.Fprintln(w, "var WebSafe = []color.Color{") + for _, line := range lines { + fmt.Fprintln(w, line) + } + fmt.Fprintln(w, "}") + fmt.Fprintln(w) +} diff --git a/src/image/color/palette/generate.go b/src/image/color/palette/generate.go new file mode 100644 index 0000000..64c2ec0 --- /dev/null +++ b/src/image/color/palette/generate.go @@ -0,0 +1,8 @@ +// Copyright 2014 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:generate go run gen.go -output palette.go + +// Package palette provides standard color palettes. +package palette diff --git a/src/image/color/palette/palette.go b/src/image/color/palette/palette.go new file mode 100644 index 0000000..2a4cdcb --- /dev/null +++ b/src/image/color/palette/palette.go @@ -0,0 +1,503 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Code generated by go run gen.go -output palette.go; DO NOT EDIT. + +package palette + +import "image/color" + +// Plan9 is a 256-color palette that partitions the 24-bit RGB space +// into 4×4×4 subdivision, with 4 shades in each subcube. Compared to the +// WebSafe, the idea is to reduce the color resolution by dicing the +// color cube into fewer cells, and to use the extra space to increase the +// intensity resolution. This results in 16 gray shades (4 gray subcubes with +// 4 samples in each), 13 shades of each primary and secondary color (3 +// subcubes with 4 samples plus black) and a reasonable selection of colors +// covering the rest of the color cube. The advantage is better representation +// of continuous tones. +// +// This palette was used in the Plan 9 Operating System, described at +// https://9p.io/magic/man2html/6/color +var Plan9 = []color.Color{ + color.RGBA{0x00, 0x00, 0x00, 0xff}, + color.RGBA{0x00, 0x00, 0x44, 0xff}, + color.RGBA{0x00, 0x00, 0x88, 0xff}, + color.RGBA{0x00, 0x00, 0xcc, 0xff}, + color.RGBA{0x00, 0x44, 0x00, 0xff}, + color.RGBA{0x00, 0x44, 0x44, 0xff}, + color.RGBA{0x00, 0x44, 0x88, 0xff}, + color.RGBA{0x00, 0x44, 0xcc, 0xff}, + color.RGBA{0x00, 0x88, 0x00, 0xff}, + color.RGBA{0x00, 0x88, 0x44, 0xff}, + color.RGBA{0x00, 0x88, 0x88, 0xff}, + color.RGBA{0x00, 0x88, 0xcc, 0xff}, + color.RGBA{0x00, 0xcc, 0x00, 0xff}, + color.RGBA{0x00, 0xcc, 0x44, 0xff}, + color.RGBA{0x00, 0xcc, 0x88, 0xff}, + color.RGBA{0x00, 0xcc, 0xcc, 0xff}, + color.RGBA{0x00, 0xdd, 0xdd, 0xff}, + color.RGBA{0x11, 0x11, 0x11, 0xff}, + color.RGBA{0x00, 0x00, 0x55, 0xff}, + color.RGBA{0x00, 0x00, 0x99, 0xff}, + color.RGBA{0x00, 0x00, 0xdd, 0xff}, + color.RGBA{0x00, 0x55, 0x00, 0xff}, + color.RGBA{0x00, 0x55, 0x55, 0xff}, + color.RGBA{0x00, 0x4c, 0x99, 0xff}, + color.RGBA{0x00, 0x49, 0xdd, 0xff}, + color.RGBA{0x00, 0x99, 0x00, 0xff}, + color.RGBA{0x00, 0x99, 0x4c, 0xff}, + color.RGBA{0x00, 0x99, 0x99, 0xff}, + color.RGBA{0x00, 0x93, 0xdd, 0xff}, + color.RGBA{0x00, 0xdd, 0x00, 0xff}, + color.RGBA{0x00, 0xdd, 0x49, 0xff}, + color.RGBA{0x00, 0xdd, 0x93, 0xff}, + color.RGBA{0x00, 0xee, 0x9e, 0xff}, + color.RGBA{0x00, 0xee, 0xee, 0xff}, + color.RGBA{0x22, 0x22, 0x22, 0xff}, + color.RGBA{0x00, 0x00, 0x66, 0xff}, + color.RGBA{0x00, 0x00, 0xaa, 0xff}, + color.RGBA{0x00, 0x00, 0xee, 0xff}, + color.RGBA{0x00, 0x66, 0x00, 0xff}, + color.RGBA{0x00, 0x66, 0x66, 0xff}, + color.RGBA{0x00, 0x55, 0xaa, 0xff}, + color.RGBA{0x00, 0x4f, 0xee, 0xff}, + color.RGBA{0x00, 0xaa, 0x00, 0xff}, + color.RGBA{0x00, 0xaa, 0x55, 0xff}, + color.RGBA{0x00, 0xaa, 0xaa, 0xff}, + color.RGBA{0x00, 0x9e, 0xee, 0xff}, + color.RGBA{0x00, 0xee, 0x00, 0xff}, + color.RGBA{0x00, 0xee, 0x4f, 0xff}, + color.RGBA{0x00, 0xff, 0x55, 0xff}, + color.RGBA{0x00, 0xff, 0xaa, 0xff}, + color.RGBA{0x00, 0xff, 0xff, 0xff}, + color.RGBA{0x33, 0x33, 0x33, 0xff}, + color.RGBA{0x00, 0x00, 0x77, 0xff}, + color.RGBA{0x00, 0x00, 0xbb, 0xff}, + color.RGBA{0x00, 0x00, 0xff, 0xff}, + color.RGBA{0x00, 0x77, 0x00, 0xff}, + color.RGBA{0x00, 0x77, 0x77, 0xff}, + color.RGBA{0x00, 0x5d, 0xbb, 0xff}, + color.RGBA{0x00, 0x55, 0xff, 0xff}, + color.RGBA{0x00, 0xbb, 0x00, 0xff}, + color.RGBA{0x00, 0xbb, 0x5d, 0xff}, + color.RGBA{0x00, 0xbb, 0xbb, 0xff}, + color.RGBA{0x00, 0xaa, 0xff, 0xff}, + color.RGBA{0x00, 0xff, 0x00, 0xff}, + color.RGBA{0x44, 0x00, 0x44, 0xff}, + color.RGBA{0x44, 0x00, 0x88, 0xff}, + color.RGBA{0x44, 0x00, 0xcc, 0xff}, + color.RGBA{0x44, 0x44, 0x00, 0xff}, + color.RGBA{0x44, 0x44, 0x44, 0xff}, + color.RGBA{0x44, 0x44, 0x88, 0xff}, + color.RGBA{0x44, 0x44, 0xcc, 0xff}, + color.RGBA{0x44, 0x88, 0x00, 0xff}, + color.RGBA{0x44, 0x88, 0x44, 0xff}, + color.RGBA{0x44, 0x88, 0x88, 0xff}, + color.RGBA{0x44, 0x88, 0xcc, 0xff}, + color.RGBA{0x44, 0xcc, 0x00, 0xff}, + color.RGBA{0x44, 0xcc, 0x44, 0xff}, + color.RGBA{0x44, 0xcc, 0x88, 0xff}, + color.RGBA{0x44, 0xcc, 0xcc, 0xff}, + color.RGBA{0x44, 0x00, 0x00, 0xff}, + color.RGBA{0x55, 0x00, 0x00, 0xff}, + color.RGBA{0x55, 0x00, 0x55, 0xff}, + color.RGBA{0x4c, 0x00, 0x99, 0xff}, + color.RGBA{0x49, 0x00, 0xdd, 0xff}, + color.RGBA{0x55, 0x55, 0x00, 0xff}, + color.RGBA{0x55, 0x55, 0x55, 0xff}, + color.RGBA{0x4c, 0x4c, 0x99, 0xff}, + color.RGBA{0x49, 0x49, 0xdd, 0xff}, + color.RGBA{0x4c, 0x99, 0x00, 0xff}, + color.RGBA{0x4c, 0x99, 0x4c, 0xff}, + color.RGBA{0x4c, 0x99, 0x99, 0xff}, + color.RGBA{0x49, 0x93, 0xdd, 0xff}, + color.RGBA{0x49, 0xdd, 0x00, 0xff}, + color.RGBA{0x49, 0xdd, 0x49, 0xff}, + color.RGBA{0x49, 0xdd, 0x93, 0xff}, + color.RGBA{0x49, 0xdd, 0xdd, 0xff}, + color.RGBA{0x4f, 0xee, 0xee, 0xff}, + color.RGBA{0x66, 0x00, 0x00, 0xff}, + color.RGBA{0x66, 0x00, 0x66, 0xff}, + color.RGBA{0x55, 0x00, 0xaa, 0xff}, + color.RGBA{0x4f, 0x00, 0xee, 0xff}, + color.RGBA{0x66, 0x66, 0x00, 0xff}, + color.RGBA{0x66, 0x66, 0x66, 0xff}, + color.RGBA{0x55, 0x55, 0xaa, 0xff}, + color.RGBA{0x4f, 0x4f, 0xee, 0xff}, + color.RGBA{0x55, 0xaa, 0x00, 0xff}, + color.RGBA{0x55, 0xaa, 0x55, 0xff}, + color.RGBA{0x55, 0xaa, 0xaa, 0xff}, + color.RGBA{0x4f, 0x9e, 0xee, 0xff}, + color.RGBA{0x4f, 0xee, 0x00, 0xff}, + color.RGBA{0x4f, 0xee, 0x4f, 0xff}, + color.RGBA{0x4f, 0xee, 0x9e, 0xff}, + color.RGBA{0x55, 0xff, 0xaa, 0xff}, + color.RGBA{0x55, 0xff, 0xff, 0xff}, + color.RGBA{0x77, 0x00, 0x00, 0xff}, + color.RGBA{0x77, 0x00, 0x77, 0xff}, + color.RGBA{0x5d, 0x00, 0xbb, 0xff}, + color.RGBA{0x55, 0x00, 0xff, 0xff}, + color.RGBA{0x77, 0x77, 0x00, 0xff}, + color.RGBA{0x77, 0x77, 0x77, 0xff}, + color.RGBA{0x5d, 0x5d, 0xbb, 0xff}, + color.RGBA{0x55, 0x55, 0xff, 0xff}, + color.RGBA{0x5d, 0xbb, 0x00, 0xff}, + color.RGBA{0x5d, 0xbb, 0x5d, 0xff}, + color.RGBA{0x5d, 0xbb, 0xbb, 0xff}, + color.RGBA{0x55, 0xaa, 0xff, 0xff}, + color.RGBA{0x55, 0xff, 0x00, 0xff}, + color.RGBA{0x55, 0xff, 0x55, 0xff}, + color.RGBA{0x88, 0x00, 0x88, 0xff}, + color.RGBA{0x88, 0x00, 0xcc, 0xff}, + color.RGBA{0x88, 0x44, 0x00, 0xff}, + color.RGBA{0x88, 0x44, 0x44, 0xff}, + color.RGBA{0x88, 0x44, 0x88, 0xff}, + color.RGBA{0x88, 0x44, 0xcc, 0xff}, + color.RGBA{0x88, 0x88, 0x00, 0xff}, + color.RGBA{0x88, 0x88, 0x44, 0xff}, + color.RGBA{0x88, 0x88, 0x88, 0xff}, + color.RGBA{0x88, 0x88, 0xcc, 0xff}, + color.RGBA{0x88, 0xcc, 0x00, 0xff}, + color.RGBA{0x88, 0xcc, 0x44, 0xff}, + color.RGBA{0x88, 0xcc, 0x88, 0xff}, + color.RGBA{0x88, 0xcc, 0xcc, 0xff}, + color.RGBA{0x88, 0x00, 0x00, 0xff}, + color.RGBA{0x88, 0x00, 0x44, 0xff}, + color.RGBA{0x99, 0x00, 0x4c, 0xff}, + color.RGBA{0x99, 0x00, 0x99, 0xff}, + color.RGBA{0x93, 0x00, 0xdd, 0xff}, + color.RGBA{0x99, 0x4c, 0x00, 0xff}, + color.RGBA{0x99, 0x4c, 0x4c, 0xff}, + color.RGBA{0x99, 0x4c, 0x99, 0xff}, + color.RGBA{0x93, 0x49, 0xdd, 0xff}, + color.RGBA{0x99, 0x99, 0x00, 0xff}, + color.RGBA{0x99, 0x99, 0x4c, 0xff}, + color.RGBA{0x99, 0x99, 0x99, 0xff}, + color.RGBA{0x93, 0x93, 0xdd, 0xff}, + color.RGBA{0x93, 0xdd, 0x00, 0xff}, + color.RGBA{0x93, 0xdd, 0x49, 0xff}, + color.RGBA{0x93, 0xdd, 0x93, 0xff}, + color.RGBA{0x93, 0xdd, 0xdd, 0xff}, + color.RGBA{0x99, 0x00, 0x00, 0xff}, + color.RGBA{0xaa, 0x00, 0x00, 0xff}, + color.RGBA{0xaa, 0x00, 0x55, 0xff}, + color.RGBA{0xaa, 0x00, 0xaa, 0xff}, + color.RGBA{0x9e, 0x00, 0xee, 0xff}, + color.RGBA{0xaa, 0x55, 0x00, 0xff}, + color.RGBA{0xaa, 0x55, 0x55, 0xff}, + color.RGBA{0xaa, 0x55, 0xaa, 0xff}, + color.RGBA{0x9e, 0x4f, 0xee, 0xff}, + color.RGBA{0xaa, 0xaa, 0x00, 0xff}, + color.RGBA{0xaa, 0xaa, 0x55, 0xff}, + color.RGBA{0xaa, 0xaa, 0xaa, 0xff}, + color.RGBA{0x9e, 0x9e, 0xee, 0xff}, + color.RGBA{0x9e, 0xee, 0x00, 0xff}, + color.RGBA{0x9e, 0xee, 0x4f, 0xff}, + color.RGBA{0x9e, 0xee, 0x9e, 0xff}, + color.RGBA{0x9e, 0xee, 0xee, 0xff}, + color.RGBA{0xaa, 0xff, 0xff, 0xff}, + color.RGBA{0xbb, 0x00, 0x00, 0xff}, + color.RGBA{0xbb, 0x00, 0x5d, 0xff}, + color.RGBA{0xbb, 0x00, 0xbb, 0xff}, + color.RGBA{0xaa, 0x00, 0xff, 0xff}, + color.RGBA{0xbb, 0x5d, 0x00, 0xff}, + color.RGBA{0xbb, 0x5d, 0x5d, 0xff}, + color.RGBA{0xbb, 0x5d, 0xbb, 0xff}, + color.RGBA{0xaa, 0x55, 0xff, 0xff}, + color.RGBA{0xbb, 0xbb, 0x00, 0xff}, + color.RGBA{0xbb, 0xbb, 0x5d, 0xff}, + color.RGBA{0xbb, 0xbb, 0xbb, 0xff}, + color.RGBA{0xaa, 0xaa, 0xff, 0xff}, + color.RGBA{0xaa, 0xff, 0x00, 0xff}, + color.RGBA{0xaa, 0xff, 0x55, 0xff}, + color.RGBA{0xaa, 0xff, 0xaa, 0xff}, + color.RGBA{0xcc, 0x00, 0xcc, 0xff}, + color.RGBA{0xcc, 0x44, 0x00, 0xff}, + color.RGBA{0xcc, 0x44, 0x44, 0xff}, + color.RGBA{0xcc, 0x44, 0x88, 0xff}, + color.RGBA{0xcc, 0x44, 0xcc, 0xff}, + color.RGBA{0xcc, 0x88, 0x00, 0xff}, + color.RGBA{0xcc, 0x88, 0x44, 0xff}, + color.RGBA{0xcc, 0x88, 0x88, 0xff}, + color.RGBA{0xcc, 0x88, 0xcc, 0xff}, + color.RGBA{0xcc, 0xcc, 0x00, 0xff}, + color.RGBA{0xcc, 0xcc, 0x44, 0xff}, + color.RGBA{0xcc, 0xcc, 0x88, 0xff}, + color.RGBA{0xcc, 0xcc, 0xcc, 0xff}, + color.RGBA{0xcc, 0x00, 0x00, 0xff}, + color.RGBA{0xcc, 0x00, 0x44, 0xff}, + color.RGBA{0xcc, 0x00, 0x88, 0xff}, + color.RGBA{0xdd, 0x00, 0x93, 0xff}, + color.RGBA{0xdd, 0x00, 0xdd, 0xff}, + color.RGBA{0xdd, 0x49, 0x00, 0xff}, + color.RGBA{0xdd, 0x49, 0x49, 0xff}, + color.RGBA{0xdd, 0x49, 0x93, 0xff}, + color.RGBA{0xdd, 0x49, 0xdd, 0xff}, + color.RGBA{0xdd, 0x93, 0x00, 0xff}, + color.RGBA{0xdd, 0x93, 0x49, 0xff}, + color.RGBA{0xdd, 0x93, 0x93, 0xff}, + color.RGBA{0xdd, 0x93, 0xdd, 0xff}, + color.RGBA{0xdd, 0xdd, 0x00, 0xff}, + color.RGBA{0xdd, 0xdd, 0x49, 0xff}, + color.RGBA{0xdd, 0xdd, 0x93, 0xff}, + color.RGBA{0xdd, 0xdd, 0xdd, 0xff}, + color.RGBA{0xdd, 0x00, 0x00, 0xff}, + color.RGBA{0xdd, 0x00, 0x49, 0xff}, + color.RGBA{0xee, 0x00, 0x4f, 0xff}, + color.RGBA{0xee, 0x00, 0x9e, 0xff}, + color.RGBA{0xee, 0x00, 0xee, 0xff}, + color.RGBA{0xee, 0x4f, 0x00, 0xff}, + color.RGBA{0xee, 0x4f, 0x4f, 0xff}, + color.RGBA{0xee, 0x4f, 0x9e, 0xff}, + color.RGBA{0xee, 0x4f, 0xee, 0xff}, + color.RGBA{0xee, 0x9e, 0x00, 0xff}, + color.RGBA{0xee, 0x9e, 0x4f, 0xff}, + color.RGBA{0xee, 0x9e, 0x9e, 0xff}, + color.RGBA{0xee, 0x9e, 0xee, 0xff}, + color.RGBA{0xee, 0xee, 0x00, 0xff}, + color.RGBA{0xee, 0xee, 0x4f, 0xff}, + color.RGBA{0xee, 0xee, 0x9e, 0xff}, + color.RGBA{0xee, 0xee, 0xee, 0xff}, + color.RGBA{0xee, 0x00, 0x00, 0xff}, + color.RGBA{0xff, 0x00, 0x00, 0xff}, + color.RGBA{0xff, 0x00, 0x55, 0xff}, + color.RGBA{0xff, 0x00, 0xaa, 0xff}, + color.RGBA{0xff, 0x00, 0xff, 0xff}, + color.RGBA{0xff, 0x55, 0x00, 0xff}, + color.RGBA{0xff, 0x55, 0x55, 0xff}, + color.RGBA{0xff, 0x55, 0xaa, 0xff}, + color.RGBA{0xff, 0x55, 0xff, 0xff}, + color.RGBA{0xff, 0xaa, 0x00, 0xff}, + color.RGBA{0xff, 0xaa, 0x55, 0xff}, + color.RGBA{0xff, 0xaa, 0xaa, 0xff}, + color.RGBA{0xff, 0xaa, 0xff, 0xff}, + color.RGBA{0xff, 0xff, 0x00, 0xff}, + color.RGBA{0xff, 0xff, 0x55, 0xff}, + color.RGBA{0xff, 0xff, 0xaa, 0xff}, + color.RGBA{0xff, 0xff, 0xff, 0xff}, +} + +// WebSafe is a 216-color palette that was popularized by early versions +// of Netscape Navigator. It is also known as the Netscape Color Cube. +// +// See https://en.wikipedia.org/wiki/Web_colors#Web-safe_colors for details. +var WebSafe = []color.Color{ + color.RGBA{0x00, 0x00, 0x00, 0xff}, + color.RGBA{0x00, 0x00, 0x33, 0xff}, + color.RGBA{0x00, 0x00, 0x66, 0xff}, + color.RGBA{0x00, 0x00, 0x99, 0xff}, + color.RGBA{0x00, 0x00, 0xcc, 0xff}, + color.RGBA{0x00, 0x00, 0xff, 0xff}, + color.RGBA{0x00, 0x33, 0x00, 0xff}, + color.RGBA{0x00, 0x33, 0x33, 0xff}, + color.RGBA{0x00, 0x33, 0x66, 0xff}, + color.RGBA{0x00, 0x33, 0x99, 0xff}, + color.RGBA{0x00, 0x33, 0xcc, 0xff}, + color.RGBA{0x00, 0x33, 0xff, 0xff}, + color.RGBA{0x00, 0x66, 0x00, 0xff}, + color.RGBA{0x00, 0x66, 0x33, 0xff}, + color.RGBA{0x00, 0x66, 0x66, 0xff}, + color.RGBA{0x00, 0x66, 0x99, 0xff}, + color.RGBA{0x00, 0x66, 0xcc, 0xff}, + color.RGBA{0x00, 0x66, 0xff, 0xff}, + color.RGBA{0x00, 0x99, 0x00, 0xff}, + color.RGBA{0x00, 0x99, 0x33, 0xff}, + color.RGBA{0x00, 0x99, 0x66, 0xff}, + color.RGBA{0x00, 0x99, 0x99, 0xff}, + color.RGBA{0x00, 0x99, 0xcc, 0xff}, + color.RGBA{0x00, 0x99, 0xff, 0xff}, + color.RGBA{0x00, 0xcc, 0x00, 0xff}, + color.RGBA{0x00, 0xcc, 0x33, 0xff}, + color.RGBA{0x00, 0xcc, 0x66, 0xff}, + color.RGBA{0x00, 0xcc, 0x99, 0xff}, + color.RGBA{0x00, 0xcc, 0xcc, 0xff}, + color.RGBA{0x00, 0xcc, 0xff, 0xff}, + color.RGBA{0x00, 0xff, 0x00, 0xff}, + color.RGBA{0x00, 0xff, 0x33, 0xff}, + color.RGBA{0x00, 0xff, 0x66, 0xff}, + color.RGBA{0x00, 0xff, 0x99, 0xff}, + color.RGBA{0x00, 0xff, 0xcc, 0xff}, + color.RGBA{0x00, 0xff, 0xff, 0xff}, + color.RGBA{0x33, 0x00, 0x00, 0xff}, + color.RGBA{0x33, 0x00, 0x33, 0xff}, + color.RGBA{0x33, 0x00, 0x66, 0xff}, + color.RGBA{0x33, 0x00, 0x99, 0xff}, + color.RGBA{0x33, 0x00, 0xcc, 0xff}, + color.RGBA{0x33, 0x00, 0xff, 0xff}, + color.RGBA{0x33, 0x33, 0x00, 0xff}, + color.RGBA{0x33, 0x33, 0x33, 0xff}, + color.RGBA{0x33, 0x33, 0x66, 0xff}, + color.RGBA{0x33, 0x33, 0x99, 0xff}, + color.RGBA{0x33, 0x33, 0xcc, 0xff}, + color.RGBA{0x33, 0x33, 0xff, 0xff}, + color.RGBA{0x33, 0x66, 0x00, 0xff}, + color.RGBA{0x33, 0x66, 0x33, 0xff}, + color.RGBA{0x33, 0x66, 0x66, 0xff}, + color.RGBA{0x33, 0x66, 0x99, 0xff}, + color.RGBA{0x33, 0x66, 0xcc, 0xff}, + color.RGBA{0x33, 0x66, 0xff, 0xff}, + color.RGBA{0x33, 0x99, 0x00, 0xff}, + color.RGBA{0x33, 0x99, 0x33, 0xff}, + color.RGBA{0x33, 0x99, 0x66, 0xff}, + color.RGBA{0x33, 0x99, 0x99, 0xff}, + color.RGBA{0x33, 0x99, 0xcc, 0xff}, + color.RGBA{0x33, 0x99, 0xff, 0xff}, + color.RGBA{0x33, 0xcc, 0x00, 0xff}, + color.RGBA{0x33, 0xcc, 0x33, 0xff}, + color.RGBA{0x33, 0xcc, 0x66, 0xff}, + color.RGBA{0x33, 0xcc, 0x99, 0xff}, + color.RGBA{0x33, 0xcc, 0xcc, 0xff}, + color.RGBA{0x33, 0xcc, 0xff, 0xff}, + color.RGBA{0x33, 0xff, 0x00, 0xff}, + color.RGBA{0x33, 0xff, 0x33, 0xff}, + color.RGBA{0x33, 0xff, 0x66, 0xff}, + color.RGBA{0x33, 0xff, 0x99, 0xff}, + color.RGBA{0x33, 0xff, 0xcc, 0xff}, + color.RGBA{0x33, 0xff, 0xff, 0xff}, + color.RGBA{0x66, 0x00, 0x00, 0xff}, + color.RGBA{0x66, 0x00, 0x33, 0xff}, + color.RGBA{0x66, 0x00, 0x66, 0xff}, + color.RGBA{0x66, 0x00, 0x99, 0xff}, + color.RGBA{0x66, 0x00, 0xcc, 0xff}, + color.RGBA{0x66, 0x00, 0xff, 0xff}, + color.RGBA{0x66, 0x33, 0x00, 0xff}, + color.RGBA{0x66, 0x33, 0x33, 0xff}, + color.RGBA{0x66, 0x33, 0x66, 0xff}, + color.RGBA{0x66, 0x33, 0x99, 0xff}, + color.RGBA{0x66, 0x33, 0xcc, 0xff}, + color.RGBA{0x66, 0x33, 0xff, 0xff}, + color.RGBA{0x66, 0x66, 0x00, 0xff}, + color.RGBA{0x66, 0x66, 0x33, 0xff}, + color.RGBA{0x66, 0x66, 0x66, 0xff}, + color.RGBA{0x66, 0x66, 0x99, 0xff}, + color.RGBA{0x66, 0x66, 0xcc, 0xff}, + color.RGBA{0x66, 0x66, 0xff, 0xff}, + color.RGBA{0x66, 0x99, 0x00, 0xff}, + color.RGBA{0x66, 0x99, 0x33, 0xff}, + color.RGBA{0x66, 0x99, 0x66, 0xff}, + color.RGBA{0x66, 0x99, 0x99, 0xff}, + color.RGBA{0x66, 0x99, 0xcc, 0xff}, + color.RGBA{0x66, 0x99, 0xff, 0xff}, + color.RGBA{0x66, 0xcc, 0x00, 0xff}, + color.RGBA{0x66, 0xcc, 0x33, 0xff}, + color.RGBA{0x66, 0xcc, 0x66, 0xff}, + color.RGBA{0x66, 0xcc, 0x99, 0xff}, + color.RGBA{0x66, 0xcc, 0xcc, 0xff}, + color.RGBA{0x66, 0xcc, 0xff, 0xff}, + color.RGBA{0x66, 0xff, 0x00, 0xff}, + color.RGBA{0x66, 0xff, 0x33, 0xff}, + color.RGBA{0x66, 0xff, 0x66, 0xff}, + color.RGBA{0x66, 0xff, 0x99, 0xff}, + color.RGBA{0x66, 0xff, 0xcc, 0xff}, + color.RGBA{0x66, 0xff, 0xff, 0xff}, + color.RGBA{0x99, 0x00, 0x00, 0xff}, + color.RGBA{0x99, 0x00, 0x33, 0xff}, + color.RGBA{0x99, 0x00, 0x66, 0xff}, + color.RGBA{0x99, 0x00, 0x99, 0xff}, + color.RGBA{0x99, 0x00, 0xcc, 0xff}, + color.RGBA{0x99, 0x00, 0xff, 0xff}, + color.RGBA{0x99, 0x33, 0x00, 0xff}, + color.RGBA{0x99, 0x33, 0x33, 0xff}, + color.RGBA{0x99, 0x33, 0x66, 0xff}, + color.RGBA{0x99, 0x33, 0x99, 0xff}, + color.RGBA{0x99, 0x33, 0xcc, 0xff}, + color.RGBA{0x99, 0x33, 0xff, 0xff}, + color.RGBA{0x99, 0x66, 0x00, 0xff}, + color.RGBA{0x99, 0x66, 0x33, 0xff}, + color.RGBA{0x99, 0x66, 0x66, 0xff}, + color.RGBA{0x99, 0x66, 0x99, 0xff}, + color.RGBA{0x99, 0x66, 0xcc, 0xff}, + color.RGBA{0x99, 0x66, 0xff, 0xff}, + color.RGBA{0x99, 0x99, 0x00, 0xff}, + color.RGBA{0x99, 0x99, 0x33, 0xff}, + color.RGBA{0x99, 0x99, 0x66, 0xff}, + color.RGBA{0x99, 0x99, 0x99, 0xff}, + color.RGBA{0x99, 0x99, 0xcc, 0xff}, + color.RGBA{0x99, 0x99, 0xff, 0xff}, + color.RGBA{0x99, 0xcc, 0x00, 0xff}, + color.RGBA{0x99, 0xcc, 0x33, 0xff}, + color.RGBA{0x99, 0xcc, 0x66, 0xff}, + color.RGBA{0x99, 0xcc, 0x99, 0xff}, + color.RGBA{0x99, 0xcc, 0xcc, 0xff}, + color.RGBA{0x99, 0xcc, 0xff, 0xff}, + color.RGBA{0x99, 0xff, 0x00, 0xff}, + color.RGBA{0x99, 0xff, 0x33, 0xff}, + color.RGBA{0x99, 0xff, 0x66, 0xff}, + color.RGBA{0x99, 0xff, 0x99, 0xff}, + color.RGBA{0x99, 0xff, 0xcc, 0xff}, + color.RGBA{0x99, 0xff, 0xff, 0xff}, + color.RGBA{0xcc, 0x00, 0x00, 0xff}, + color.RGBA{0xcc, 0x00, 0x33, 0xff}, + color.RGBA{0xcc, 0x00, 0x66, 0xff}, + color.RGBA{0xcc, 0x00, 0x99, 0xff}, + color.RGBA{0xcc, 0x00, 0xcc, 0xff}, + color.RGBA{0xcc, 0x00, 0xff, 0xff}, + color.RGBA{0xcc, 0x33, 0x00, 0xff}, + color.RGBA{0xcc, 0x33, 0x33, 0xff}, + color.RGBA{0xcc, 0x33, 0x66, 0xff}, + color.RGBA{0xcc, 0x33, 0x99, 0xff}, + color.RGBA{0xcc, 0x33, 0xcc, 0xff}, + color.RGBA{0xcc, 0x33, 0xff, 0xff}, + color.RGBA{0xcc, 0x66, 0x00, 0xff}, + color.RGBA{0xcc, 0x66, 0x33, 0xff}, + color.RGBA{0xcc, 0x66, 0x66, 0xff}, + color.RGBA{0xcc, 0x66, 0x99, 0xff}, + color.RGBA{0xcc, 0x66, 0xcc, 0xff}, + color.RGBA{0xcc, 0x66, 0xff, 0xff}, + color.RGBA{0xcc, 0x99, 0x00, 0xff}, + color.RGBA{0xcc, 0x99, 0x33, 0xff}, + color.RGBA{0xcc, 0x99, 0x66, 0xff}, + color.RGBA{0xcc, 0x99, 0x99, 0xff}, + color.RGBA{0xcc, 0x99, 0xcc, 0xff}, + color.RGBA{0xcc, 0x99, 0xff, 0xff}, + color.RGBA{0xcc, 0xcc, 0x00, 0xff}, + color.RGBA{0xcc, 0xcc, 0x33, 0xff}, + color.RGBA{0xcc, 0xcc, 0x66, 0xff}, + color.RGBA{0xcc, 0xcc, 0x99, 0xff}, + color.RGBA{0xcc, 0xcc, 0xcc, 0xff}, + color.RGBA{0xcc, 0xcc, 0xff, 0xff}, + color.RGBA{0xcc, 0xff, 0x00, 0xff}, + color.RGBA{0xcc, 0xff, 0x33, 0xff}, + color.RGBA{0xcc, 0xff, 0x66, 0xff}, + color.RGBA{0xcc, 0xff, 0x99, 0xff}, + color.RGBA{0xcc, 0xff, 0xcc, 0xff}, + color.RGBA{0xcc, 0xff, 0xff, 0xff}, + color.RGBA{0xff, 0x00, 0x00, 0xff}, + color.RGBA{0xff, 0x00, 0x33, 0xff}, + color.RGBA{0xff, 0x00, 0x66, 0xff}, + color.RGBA{0xff, 0x00, 0x99, 0xff}, + color.RGBA{0xff, 0x00, 0xcc, 0xff}, + color.RGBA{0xff, 0x00, 0xff, 0xff}, + color.RGBA{0xff, 0x33, 0x00, 0xff}, + color.RGBA{0xff, 0x33, 0x33, 0xff}, + color.RGBA{0xff, 0x33, 0x66, 0xff}, + color.RGBA{0xff, 0x33, 0x99, 0xff}, + color.RGBA{0xff, 0x33, 0xcc, 0xff}, + color.RGBA{0xff, 0x33, 0xff, 0xff}, + color.RGBA{0xff, 0x66, 0x00, 0xff}, + color.RGBA{0xff, 0x66, 0x33, 0xff}, + color.RGBA{0xff, 0x66, 0x66, 0xff}, + color.RGBA{0xff, 0x66, 0x99, 0xff}, + color.RGBA{0xff, 0x66, 0xcc, 0xff}, + color.RGBA{0xff, 0x66, 0xff, 0xff}, + color.RGBA{0xff, 0x99, 0x00, 0xff}, + color.RGBA{0xff, 0x99, 0x33, 0xff}, + color.RGBA{0xff, 0x99, 0x66, 0xff}, + color.RGBA{0xff, 0x99, 0x99, 0xff}, + color.RGBA{0xff, 0x99, 0xcc, 0xff}, + color.RGBA{0xff, 0x99, 0xff, 0xff}, + color.RGBA{0xff, 0xcc, 0x00, 0xff}, + color.RGBA{0xff, 0xcc, 0x33, 0xff}, + color.RGBA{0xff, 0xcc, 0x66, 0xff}, + color.RGBA{0xff, 0xcc, 0x99, 0xff}, + color.RGBA{0xff, 0xcc, 0xcc, 0xff}, + color.RGBA{0xff, 0xcc, 0xff, 0xff}, + color.RGBA{0xff, 0xff, 0x00, 0xff}, + color.RGBA{0xff, 0xff, 0x33, 0xff}, + color.RGBA{0xff, 0xff, 0x66, 0xff}, + color.RGBA{0xff, 0xff, 0x99, 0xff}, + color.RGBA{0xff, 0xff, 0xcc, 0xff}, + color.RGBA{0xff, 0xff, 0xff, 0xff}, +} diff --git a/src/image/color/ycbcr.go b/src/image/color/ycbcr.go new file mode 100644 index 0000000..8b6d508 --- /dev/null +++ b/src/image/color/ycbcr.go @@ -0,0 +1,373 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package color + +// RGBToYCbCr converts an RGB triple to a Y'CbCr triple. +func RGBToYCbCr(r, g, b uint8) (uint8, uint8, uint8) { + // The JFIF specification says: + // Y' = 0.2990*R + 0.5870*G + 0.1140*B + // Cb = -0.1687*R - 0.3313*G + 0.5000*B + 128 + // Cr = 0.5000*R - 0.4187*G - 0.0813*B + 128 + // https://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'. + + r1 := int32(r) + g1 := int32(g) + b1 := int32(b) + + // yy is in range [0,0xff]. + // + // Note that 19595 + 38470 + 7471 equals 65536. + yy := (19595*r1 + 38470*g1 + 7471*b1 + 1<<15) >> 16 + + // The bit twiddling below is equivalent to + // + // cb := (-11056*r1 - 21712*g1 + 32768*b1 + 257<<15) >> 16 + // if cb < 0 { + // cb = 0 + // } else if cb > 0xff { + // cb = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute cr uses a similar pattern. + // + // Note that -11056 - 21712 + 32768 equals 0. + cb := -11056*r1 - 21712*g1 + 32768*b1 + 257<<15 + if uint32(cb)&0xff000000 == 0 { + cb >>= 16 + } else { + cb = ^(cb >> 31) + } + + // Note that 32768 - 27440 - 5328 equals 0. + cr := 32768*r1 - 27440*g1 - 5328*b1 + 257<<15 + if uint32(cr)&0xff000000 == 0 { + cr >>= 16 + } else { + cr = ^(cr >> 31) + } + + return uint8(yy), uint8(cb), uint8(cr) +} + +// YCbCrToRGB converts a Y'CbCr triple to an RGB triple. +func YCbCrToRGB(y, cb, cr uint8) (uint8, uint8, uint8) { + // The JFIF specification says: + // R = Y' + 1.40200*(Cr-128) + // G = Y' - 0.34414*(Cb-128) - 0.71414*(Cr-128) + // B = Y' + 1.77200*(Cb-128) + // https://www.w3.org/Graphics/JPEG/jfif3.pdf says Y but means Y'. + // + // Those formulae use non-integer multiplication factors. When computing, + // integer math is generally faster than floating point math. We multiply + // all of those factors by 1<<16 and round to the nearest integer: + // 91881 = roundToNearestInteger(1.40200 * 65536). + // 22554 = roundToNearestInteger(0.34414 * 65536). + // 46802 = roundToNearestInteger(0.71414 * 65536). + // 116130 = roundToNearestInteger(1.77200 * 65536). + // + // Adding a rounding adjustment in the range [0, 1<<16-1] and then shifting + // right by 16 gives us an integer math version of the original formulae. + // R = (65536*Y' + 91881 *(Cr-128) + adjustment) >> 16 + // G = (65536*Y' - 22554 *(Cb-128) - 46802*(Cr-128) + adjustment) >> 16 + // B = (65536*Y' + 116130 *(Cb-128) + adjustment) >> 16 + // A constant rounding adjustment of 1<<15, one half of 1<<16, would mean + // round-to-nearest when dividing by 65536 (shifting right by 16). + // Similarly, a constant rounding adjustment of 0 would mean round-down. + // + // Defining YY1 = 65536*Y' + adjustment simplifies the formulae and + // requires fewer CPU operations: + // R = (YY1 + 91881 *(Cr-128) ) >> 16 + // G = (YY1 - 22554 *(Cb-128) - 46802*(Cr-128)) >> 16 + // B = (YY1 + 116130 *(Cb-128) ) >> 16 + // + // The inputs (y, cb, cr) are 8 bit color, ranging in [0x00, 0xff]. In this + // function, the output is also 8 bit color, but in the related YCbCr.RGBA + // method, below, the output is 16 bit color, ranging in [0x0000, 0xffff]. + // Outputting 16 bit color simply requires changing the 16 to 8 in the "R = + // etc >> 16" equation, and likewise for G and B. + // + // As mentioned above, a constant rounding adjustment of 1<<15 is a natural + // choice, but there is an additional constraint: if c0 := YCbCr{Y: y, Cb: + // 0x80, Cr: 0x80} and c1 := Gray{Y: y} then c0.RGBA() should equal + // c1.RGBA(). Specifically, if y == 0 then "R = etc >> 8" should yield + // 0x0000 and if y == 0xff then "R = etc >> 8" should yield 0xffff. If we + // used a constant rounding adjustment of 1<<15, then it would yield 0x0080 + // and 0xff80 respectively. + // + // Note that when cb == 0x80 and cr == 0x80 then the formulae collapse to: + // R = YY1 >> n + // G = YY1 >> n + // B = YY1 >> n + // where n is 16 for this function (8 bit color output) and 8 for the + // YCbCr.RGBA method (16 bit color output). + // + // The solution is to make the rounding adjustment non-constant, and equal + // to 257*Y', which ranges over [0, 1<<16-1] as Y' ranges over [0, 255]. + // YY1 is then defined as: + // YY1 = 65536*Y' + 257*Y' + // or equivalently: + // YY1 = Y' * 0x10101 + yy1 := int32(y) * 0x10101 + cb1 := int32(cb) - 128 + cr1 := int32(cr) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + return uint8(r), uint8(g), uint8(b) +} + +// YCbCr represents a fully opaque 24-bit Y'CbCr color, having 8 bits each for +// one luma and two chroma components. +// +// JPEG, VP8, the MPEG family and other codecs use this color model. Such +// codecs often use the terms YUV and Y'CbCr interchangeably, but strictly +// speaking, the term YUV applies only to analog video signals, and Y' (luma) +// is Y (luminance) after applying gamma correction. +// +// Conversion between RGB and Y'CbCr is lossy and there are multiple, slightly +// different formulae for converting between the two. This package follows +// the JFIF specification at https://www.w3.org/Graphics/JPEG/jfif3.pdf. +type YCbCr struct { + Y, Cb, Cr uint8 +} + +func (c YCbCr) RGBA() (uint32, uint32, uint32, uint32) { + // This code is a copy of the YCbCrToRGB function above, except that it + // returns values in the range [0, 0xffff] instead of [0, 0xff]. There is a + // subtle difference between doing this and having YCbCr satisfy the Color + // interface by first converting to an RGBA. The latter loses some + // information by going to and from 8 bits per channel. + // + // For example, this code: + // const y, cb, cr = 0x7f, 0x7f, 0x7f + // r, g, b := color.YCbCrToRGB(y, cb, cr) + // r0, g0, b0, _ := color.YCbCr{y, cb, cr}.RGBA() + // r1, g1, b1, _ := color.RGBA{r, g, b, 0xff}.RGBA() + // fmt.Printf("0x%04x 0x%04x 0x%04x\n", r0, g0, b0) + // fmt.Printf("0x%04x 0x%04x 0x%04x\n", r1, g1, b1) + // prints: + // 0x7e18 0x808d 0x7db9 + // 0x7e7e 0x8080 0x7d7d + + yy1 := int32(c.Y) * 0x10101 + cb1 := int32(c.Cb) - 128 + cr1 := int32(c.Cr) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 8 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = 0xffff + // } + // + // but uses fewer branches and is faster. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 8 + } else { + r = ^(r >> 31) & 0xffff + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 8 + } else { + g = ^(g >> 31) & 0xffff + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 8 + } else { + b = ^(b >> 31) & 0xffff + } + + return uint32(r), uint32(g), uint32(b), 0xffff +} + +// YCbCrModel is the Model for Y'CbCr colors. +var YCbCrModel Model = ModelFunc(yCbCrModel) + +func yCbCrModel(c Color) Color { + if _, ok := c.(YCbCr); ok { + return c + } + r, g, b, _ := c.RGBA() + y, u, v := RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8)) + return YCbCr{y, u, v} +} + +// NYCbCrA represents a non-alpha-premultiplied Y'CbCr-with-alpha color, having +// 8 bits each for one luma, two chroma and one alpha component. +type NYCbCrA struct { + YCbCr + A uint8 +} + +func (c NYCbCrA) RGBA() (uint32, uint32, uint32, uint32) { + // The first part of this method is the same as YCbCr.RGBA. + yy1 := int32(c.Y) * 0x10101 + cb1 := int32(c.Cb) - 128 + cr1 := int32(c.Cr) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 8 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = 0xffff + // } + // + // but uses fewer branches and is faster. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 8 + } else { + r = ^(r >> 31) & 0xffff + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 8 + } else { + g = ^(g >> 31) & 0xffff + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 8 + } else { + b = ^(b >> 31) & 0xffff + } + + // The second part of this method applies the alpha. + a := uint32(c.A) * 0x101 + return uint32(r) * a / 0xffff, uint32(g) * a / 0xffff, uint32(b) * a / 0xffff, a +} + +// NYCbCrAModel is the Model for non-alpha-premultiplied Y'CbCr-with-alpha +// colors. +var NYCbCrAModel Model = ModelFunc(nYCbCrAModel) + +func nYCbCrAModel(c Color) Color { + switch c := c.(type) { + case NYCbCrA: + return c + case YCbCr: + return NYCbCrA{c, 0xff} + } + r, g, b, a := c.RGBA() + + // Convert from alpha-premultiplied to non-alpha-premultiplied. + if a != 0 { + r = (r * 0xffff) / a + g = (g * 0xffff) / a + b = (b * 0xffff) / a + } + + y, u, v := RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8)) + return NYCbCrA{YCbCr{Y: y, Cb: u, Cr: v}, uint8(a >> 8)} +} + +// RGBToCMYK converts an RGB triple to a CMYK quadruple. +func RGBToCMYK(r, g, b uint8) (uint8, uint8, uint8, uint8) { + rr := uint32(r) + gg := uint32(g) + bb := uint32(b) + w := rr + if w < gg { + w = gg + } + if w < bb { + w = bb + } + if w == 0 { + return 0, 0, 0, 0xff + } + c := (w - rr) * 0xff / w + m := (w - gg) * 0xff / w + y := (w - bb) * 0xff / w + return uint8(c), uint8(m), uint8(y), uint8(0xff - w) +} + +// CMYKToRGB converts a CMYK quadruple to an RGB triple. +func CMYKToRGB(c, m, y, k uint8) (uint8, uint8, uint8) { + w := 0xffff - uint32(k)*0x101 + r := (0xffff - uint32(c)*0x101) * w / 0xffff + g := (0xffff - uint32(m)*0x101) * w / 0xffff + b := (0xffff - uint32(y)*0x101) * w / 0xffff + return uint8(r >> 8), uint8(g >> 8), uint8(b >> 8) +} + +// CMYK represents a fully opaque CMYK color, having 8 bits for each of cyan, +// magenta, yellow and black. +// +// It is not associated with any particular color profile. +type CMYK struct { + C, M, Y, K uint8 +} + +func (c CMYK) RGBA() (uint32, uint32, uint32, uint32) { + // This code is a copy of the CMYKToRGB function above, except that it + // returns values in the range [0, 0xffff] instead of [0, 0xff]. + + w := 0xffff - uint32(c.K)*0x101 + r := (0xffff - uint32(c.C)*0x101) * w / 0xffff + g := (0xffff - uint32(c.M)*0x101) * w / 0xffff + b := (0xffff - uint32(c.Y)*0x101) * w / 0xffff + return r, g, b, 0xffff +} + +// CMYKModel is the Model for CMYK colors. +var CMYKModel Model = ModelFunc(cmykModel) + +func cmykModel(c Color) Color { + if _, ok := c.(CMYK); ok { + return c + } + r, g, b, _ := c.RGBA() + cc, mm, yy, kk := RGBToCMYK(uint8(r>>8), uint8(g>>8), uint8(b>>8)) + return CMYK{cc, mm, yy, kk} +} diff --git a/src/image/color/ycbcr_test.go b/src/image/color/ycbcr_test.go new file mode 100644 index 0000000..85c1b98 --- /dev/null +++ b/src/image/color/ycbcr_test.go @@ -0,0 +1,266 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package color + +import ( + "fmt" + "testing" +) + +func delta(x, y uint8) uint8 { + if x >= y { + return x - y + } + return y - x +} + +func eq(c0, c1 Color) error { + r0, g0, b0, a0 := c0.RGBA() + r1, g1, b1, a1 := c1.RGBA() + if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 { + return fmt.Errorf("got 0x%04x 0x%04x 0x%04x 0x%04x\nwant 0x%04x 0x%04x 0x%04x 0x%04x", + r0, g0, b0, a0, r1, g1, b1, a1) + } + return nil +} + +// TestYCbCrRoundtrip tests that a subset of RGB space can be converted to YCbCr +// and back to within 2/256 tolerance. +func TestYCbCrRoundtrip(t *testing.T) { + for r := 0; r < 256; r += 7 { + for g := 0; g < 256; g += 5 { + for b := 0; b < 256; b += 3 { + r0, g0, b0 := uint8(r), uint8(g), uint8(b) + y, cb, cr := RGBToYCbCr(r0, g0, b0) + r1, g1, b1 := YCbCrToRGB(y, cb, cr) + if delta(r0, r1) > 2 || delta(g0, g1) > 2 || delta(b0, b1) > 2 { + t.Fatalf("\nr0, g0, b0 = %d, %d, %d\ny, cb, cr = %d, %d, %d\nr1, g1, b1 = %d, %d, %d", + r0, g0, b0, y, cb, cr, r1, g1, b1) + } + } + } + } +} + +// TestYCbCrToRGBConsistency tests that calling the RGBA method (16 bit color) +// then truncating to 8 bits is equivalent to calling the YCbCrToRGB function (8 +// bit color). +func TestYCbCrToRGBConsistency(t *testing.T) { + for y := 0; y < 256; y += 7 { + for cb := 0; cb < 256; cb += 5 { + for cr := 0; cr < 256; cr += 3 { + x := YCbCr{uint8(y), uint8(cb), uint8(cr)} + r0, g0, b0, _ := x.RGBA() + r1, g1, b1 := uint8(r0>>8), uint8(g0>>8), uint8(b0>>8) + r2, g2, b2 := YCbCrToRGB(x.Y, x.Cb, x.Cr) + if r1 != r2 || g1 != g2 || b1 != b2 { + t.Fatalf("y, cb, cr = %d, %d, %d\nr1, g1, b1 = %d, %d, %d\nr2, g2, b2 = %d, %d, %d", + y, cb, cr, r1, g1, b1, r2, g2, b2) + } + } + } + } +} + +// TestYCbCrGray tests that YCbCr colors are a superset of Gray colors. +func TestYCbCrGray(t *testing.T) { + for i := 0; i < 256; i++ { + c0 := YCbCr{uint8(i), 0x80, 0x80} + c1 := Gray{uint8(i)} + if err := eq(c0, c1); err != nil { + t.Errorf("i=0x%02x:\n%v", i, err) + } + } +} + +// TestNYCbCrAAlpha tests that NYCbCrA colors are a superset of Alpha colors. +func TestNYCbCrAAlpha(t *testing.T) { + for i := 0; i < 256; i++ { + c0 := NYCbCrA{YCbCr{0xff, 0x80, 0x80}, uint8(i)} + c1 := Alpha{uint8(i)} + if err := eq(c0, c1); err != nil { + t.Errorf("i=0x%02x:\n%v", i, err) + } + } +} + +// TestNYCbCrAYCbCr tests that NYCbCrA colors are a superset of YCbCr colors. +func TestNYCbCrAYCbCr(t *testing.T) { + for i := 0; i < 256; i++ { + c0 := NYCbCrA{YCbCr{uint8(i), 0x40, 0xc0}, 0xff} + c1 := YCbCr{uint8(i), 0x40, 0xc0} + if err := eq(c0, c1); err != nil { + t.Errorf("i=0x%02x:\n%v", i, err) + } + } +} + +// TestCMYKRoundtrip tests that a subset of RGB space can be converted to CMYK +// and back to within 1/256 tolerance. +func TestCMYKRoundtrip(t *testing.T) { + for r := 0; r < 256; r += 7 { + for g := 0; g < 256; g += 5 { + for b := 0; b < 256; b += 3 { + r0, g0, b0 := uint8(r), uint8(g), uint8(b) + c, m, y, k := RGBToCMYK(r0, g0, b0) + r1, g1, b1 := CMYKToRGB(c, m, y, k) + if delta(r0, r1) > 1 || delta(g0, g1) > 1 || delta(b0, b1) > 1 { + t.Fatalf("\nr0, g0, b0 = %d, %d, %d\nc, m, y, k = %d, %d, %d, %d\nr1, g1, b1 = %d, %d, %d", + r0, g0, b0, c, m, y, k, r1, g1, b1) + } + } + } + } +} + +// TestCMYKToRGBConsistency tests that calling the RGBA method (16 bit color) +// then truncating to 8 bits is equivalent to calling the CMYKToRGB function (8 +// bit color). +func TestCMYKToRGBConsistency(t *testing.T) { + for c := 0; c < 256; c += 7 { + for m := 0; m < 256; m += 5 { + for y := 0; y < 256; y += 3 { + for k := 0; k < 256; k += 11 { + x := CMYK{uint8(c), uint8(m), uint8(y), uint8(k)} + r0, g0, b0, _ := x.RGBA() + r1, g1, b1 := uint8(r0>>8), uint8(g0>>8), uint8(b0>>8) + r2, g2, b2 := CMYKToRGB(x.C, x.M, x.Y, x.K) + if r1 != r2 || g1 != g2 || b1 != b2 { + t.Fatalf("c, m, y, k = %d, %d, %d, %d\nr1, g1, b1 = %d, %d, %d\nr2, g2, b2 = %d, %d, %d", + c, m, y, k, r1, g1, b1, r2, g2, b2) + } + } + } + } + } +} + +// TestCMYKGray tests that CMYK colors are a superset of Gray colors. +func TestCMYKGray(t *testing.T) { + for i := 0; i < 256; i++ { + if err := eq(CMYK{0x00, 0x00, 0x00, uint8(255 - i)}, Gray{uint8(i)}); err != nil { + t.Errorf("i=0x%02x:\n%v", i, err) + } + } +} + +func TestPalette(t *testing.T) { + p := Palette{ + RGBA{0xff, 0xff, 0xff, 0xff}, + RGBA{0x80, 0x00, 0x00, 0xff}, + RGBA{0x7f, 0x00, 0x00, 0x7f}, + RGBA{0x00, 0x00, 0x00, 0x7f}, + RGBA{0x00, 0x00, 0x00, 0x00}, + RGBA{0x40, 0x40, 0x40, 0x40}, + } + // Check that, for a Palette with no repeated colors, the closest color to + // each element is itself. + for i, c := range p { + j := p.Index(c) + if i != j { + t.Errorf("Index(%v): got %d (color = %v), want %d", c, j, p[j], i) + } + } + // Check that finding the closest color considers alpha, not just red, + // green and blue. + got := p.Convert(RGBA{0x80, 0x00, 0x00, 0x80}) + want := RGBA{0x7f, 0x00, 0x00, 0x7f} + if got != want { + t.Errorf("got %v, want %v", got, want) + } +} + +var sink8 uint8 +var sink32 uint32 + +func BenchmarkYCbCrToRGB(b *testing.B) { + // YCbCrToRGB does saturating arithmetic. + // Low, middle, and high values can take + // different paths through the generated code. + b.Run("0", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = YCbCrToRGB(0, 0, 0) + } + }) + b.Run("128", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = YCbCrToRGB(128, 128, 128) + } + }) + b.Run("255", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = YCbCrToRGB(255, 255, 255) + } + }) +} + +func BenchmarkRGBToYCbCr(b *testing.B) { + // RGBToYCbCr does saturating arithmetic. + // Different values can take different paths + // through the generated code. + b.Run("0", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = RGBToYCbCr(0, 0, 0) + } + }) + b.Run("Cb", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = RGBToYCbCr(0, 0, 255) + } + }) + b.Run("Cr", func(b *testing.B) { + for i := 0; i < b.N; i++ { + sink8, sink8, sink8 = RGBToYCbCr(255, 0, 0) + } + }) +} + +func BenchmarkYCbCrToRGBA(b *testing.B) { + // RGB does saturating arithmetic. + // Low, middle, and high values can take + // different paths through the generated code. + b.Run("0", func(b *testing.B) { + c := YCbCr{0, 0, 0} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) + b.Run("128", func(b *testing.B) { + c := YCbCr{128, 128, 128} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) + b.Run("255", func(b *testing.B) { + c := YCbCr{255, 255, 255} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) +} + +func BenchmarkNYCbCrAToRGBA(b *testing.B) { + // RGBA does saturating arithmetic. + // Low, middle, and high values can take + // different paths through the generated code. + b.Run("0", func(b *testing.B) { + c := NYCbCrA{YCbCr{0, 0, 0}, 0xff} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) + b.Run("128", func(b *testing.B) { + c := NYCbCrA{YCbCr{128, 128, 128}, 0xff} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) + b.Run("255", func(b *testing.B) { + c := NYCbCrA{YCbCr{255, 255, 255}, 0xff} + for i := 0; i < b.N; i++ { + sink32, sink32, sink32, sink32 = c.RGBA() + } + }) +} diff --git a/src/image/decode_example_test.go b/src/image/decode_example_test.go new file mode 100644 index 0000000..526c03f --- /dev/null +++ b/src/image/decode_example_test.go @@ -0,0 +1,149 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// This example demonstrates decoding a JPEG image and examining its pixels. +package image_test + +import ( + "encoding/base64" + "fmt" + "image" + "log" + "strings" + + // Package image/jpeg is not used explicitly in the code below, + // but is imported for its initialization side-effect, which allows + // image.Decode to understand JPEG formatted images. Uncomment these + // two lines to also understand GIF and PNG images: + // _ "image/gif" + // _ "image/png" + _ "image/jpeg" +) + +func Example_decodeConfig() { + reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data)) + config, format, err := image.DecodeConfig(reader) + if err != nil { + log.Fatal(err) + } + fmt.Println("Width:", config.Width, "Height:", config.Height, "Format:", format) +} + +func Example() { + // Decode the JPEG data. If reading from file, create a reader with + // + // reader, err := os.Open("testdata/video-001.q50.420.jpeg") + // if err != nil { + // log.Fatal(err) + // } + // defer reader.Close() + reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(data)) + m, _, err := image.Decode(reader) + if err != nil { + log.Fatal(err) + } + bounds := m.Bounds() + + // Calculate a 16-bin histogram for m's red, green, blue and alpha components. + // + // An image's bounds do not necessarily start at (0, 0), so the two loops start + // at bounds.Min.Y and bounds.Min.X. Looping over Y first and X second is more + // likely to result in better memory access patterns than X first and Y second. + var histogram [16][4]int + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + for x := bounds.Min.X; x < bounds.Max.X; x++ { + r, g, b, a := m.At(x, y).RGBA() + // A color's RGBA method returns values in the range [0, 65535]. + // Shifting by 12 reduces this to the range [0, 15]. + histogram[r>>12][0]++ + histogram[g>>12][1]++ + histogram[b>>12][2]++ + histogram[a>>12][3]++ + } + } + + // Print the results. + fmt.Printf("%-14s %6s %6s %6s %6s\n", "bin", "red", "green", "blue", "alpha") + for i, x := range histogram { + fmt.Printf("0x%04x-0x%04x: %6d %6d %6d %6d\n", i<<12, (i+1)<<12-1, x[0], x[1], x[2], x[3]) + } + // Output: + // bin red green blue alpha + // 0x0000-0x0fff: 364 790 7242 0 + // 0x1000-0x1fff: 645 2967 1039 0 + // 0x2000-0x2fff: 1072 2299 979 0 + // 0x3000-0x3fff: 820 2266 980 0 + // 0x4000-0x4fff: 537 1305 541 0 + // 0x5000-0x5fff: 319 962 261 0 + // 0x6000-0x6fff: 322 375 177 0 + // 0x7000-0x7fff: 601 279 214 0 + // 0x8000-0x8fff: 3478 227 273 0 + // 0x9000-0x9fff: 2260 234 329 0 + // 0xa000-0xafff: 921 282 373 0 + // 0xb000-0xbfff: 321 335 397 0 + // 0xc000-0xcfff: 229 388 298 0 + // 0xd000-0xdfff: 260 414 277 0 + // 0xe000-0xefff: 516 428 298 0 + // 0xf000-0xffff: 2785 1899 1772 15450 +} + +const data = ` +/9j/4AAQSkZJRgABAQIAHAAcAAD/2wBDABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzODdA +SFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2P/2wBDARESEhgVGC8aGi9jQjhCY2NjY2NjY2NjY2Nj +Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2P/wAARCABnAJYDASIAAhEBAxEB/8QA +HwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIh +MUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVW +V1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXG +x8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQF 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+eLy5zwZI/lb8fX8azIvBUUTHdfSFP4QsYB/HNZ+k+KEnRY75hHOvAk6K/v7H9K6yyvlnQBmDZ6GsnzR0 +N0oy1RzOtaN/Y1tHNFO06u+zYy4I4Jzx9KKveJblXuordSGES5b6n/62PzorKVdp2LjQTVyWz8UWEWlq +jSgyxfJt6EgdDzWTdeLIZGO7zHI/hVajGmWWP+PWL8qwlAIURrhpMAHHJA71pRcZrToZzcoEuo6heakA +GHk245CZ6/X1qPTLq40q+W5t2QybSpDAkEEc55/zilk5k2r91eKhLDzWz2rpsczbbuemeD76fUNG865I +MiysmQMZAAwa3a5j4ftu0ByP+fh/5CulkLLG7INzhSVHqe1Fh3uOoqn9qQQxyhndmHIxwOmSR2xQ13KD +KoiBZOV9JBnt707MVy5RWdNdy7wRGf3bfMinnO1jg+vY03WXLaJO3mhQ20b0zwpYf0qlG7S7icrJs08U +VwumgC+YiQyeVtZH567hzj8aSL949oGhE/2v5pJCDkksQwBHC4/+vXQ8LZ2uYxxCavY7us/xCcaBfn0h +b+VP0bnSrb94ZMJgOecj1rl/GfidUE2k2gy5+SeQjgA/wj3rlas2jdao48qrjLAGkSKPk4Gc1WMj92I+ +lIJnU8OfxPWo5inBokmtQTmM4OOh71b0q6vbFmWCbaxHyqQGAP0PT8KhSTzVyo5ocSKA5VfTOTmqsmRd +pl99XjPzThzK3zOeOSeveirNmkgg/fIpYsTkYORxRXmzlTjJqx6EVUcU7mhkKCzdAK59QI9zYxtG1fYU +UVtgtmY4nZEa8Ak9aqFv3rfSiiu1nMeifDv/AJF+T/r4f+QrqqKKQwzQenNFFMCOKFIgNuThdoJ5OPSk +ubeK6t3gnXdG4wwziiii/UTKMOg6dbzJLFE4dSCP3rEdeOM8805tDsGMvySgSsS6rM6gk9eAcUUVftZt +3uyVGNthuq3Eei6DK8H7sRR7YuMgHtXkc8rzTNLM26RyWY+p70UVnLY0iEsUipG7rhZBlDkc1HgYoorM +0HwyBXGeRjmrcUhMg2ghezd//rUUVcTKW5s2jZtY/QDaOKKKK8ip8bPRj8KP/9k= +` diff --git a/src/image/decode_test.go b/src/image/decode_test.go new file mode 100644 index 0000000..2b3ff6b --- /dev/null +++ b/src/image/decode_test.go @@ -0,0 +1,135 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image_test + +import ( + "bufio" + "fmt" + "image" + "image/color" + "os" + "testing" + + _ "image/gif" + _ "image/jpeg" + _ "image/png" +) + +type imageTest struct { + goldenFilename string + filename string + tolerance int +} + +var imageTests = []imageTest{ + {"testdata/video-001.png", "testdata/video-001.png", 0}, + // GIF images are restricted to a 256-color palette and the conversion + // to GIF loses significant image quality. + {"testdata/video-001.png", "testdata/video-001.gif", 64 << 8}, + {"testdata/video-001.png", "testdata/video-001.interlaced.gif", 64 << 8}, + {"testdata/video-001.png", "testdata/video-001.5bpp.gif", 128 << 8}, + // JPEG is a lossy format and hence needs a non-zero tolerance. + {"testdata/video-001.png", "testdata/video-001.jpeg", 8 << 8}, + {"testdata/video-001.png", "testdata/video-001.progressive.jpeg", 8 << 8}, + {"testdata/video-001.221212.png", "testdata/video-001.221212.jpeg", 8 << 8}, + {"testdata/video-001.cmyk.png", "testdata/video-001.cmyk.jpeg", 8 << 8}, + {"testdata/video-001.rgb.png", "testdata/video-001.rgb.jpeg", 8 << 8}, + {"testdata/video-001.progressive.truncated.png", "testdata/video-001.progressive.truncated.jpeg", 8 << 8}, + // Grayscale images. + {"testdata/video-005.gray.png", "testdata/video-005.gray.jpeg", 8 << 8}, + {"testdata/video-005.gray.png", "testdata/video-005.gray.png", 0}, +} + +func decode(filename string) (image.Image, string, error) { + f, err := os.Open(filename) + if err != nil { + return nil, "", err + } + defer f.Close() + return image.Decode(bufio.NewReader(f)) +} + +func decodeConfig(filename string) (image.Config, string, error) { + f, err := os.Open(filename) + if err != nil { + return image.Config{}, "", err + } + defer f.Close() + return image.DecodeConfig(bufio.NewReader(f)) +} + +func delta(u0, u1 uint32) int { + d := int(u0) - int(u1) + if d < 0 { + return -d + } + return d +} + +func withinTolerance(c0, c1 color.Color, tolerance int) bool { + r0, g0, b0, a0 := c0.RGBA() + r1, g1, b1, a1 := c1.RGBA() + r := delta(r0, r1) + g := delta(g0, g1) + b := delta(b0, b1) + a := delta(a0, a1) + return r <= tolerance && g <= tolerance && b <= tolerance && a <= tolerance +} + +func TestDecode(t *testing.T) { + rgba := func(c color.Color) string { + r, g, b, a := c.RGBA() + return fmt.Sprintf("rgba = 0x%04x, 0x%04x, 0x%04x, 0x%04x for %T%v", r, g, b, a, c, c) + } + + golden := make(map[string]image.Image) +loop: + for _, it := range imageTests { + g := golden[it.goldenFilename] + if g == nil { + var err error + g, _, err = decode(it.goldenFilename) + if err != nil { + t.Errorf("%s: %v", it.goldenFilename, err) + continue loop + } + golden[it.goldenFilename] = g + } + m, imageFormat, err := decode(it.filename) + if err != nil { + t.Errorf("%s: %v", it.filename, err) + continue loop + } + b := g.Bounds() + if !b.Eq(m.Bounds()) { + t.Errorf("%s: got bounds %v want %v", it.filename, m.Bounds(), b) + continue loop + } + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !withinTolerance(g.At(x, y), m.At(x, y), it.tolerance) { + t.Errorf("%s: at (%d, %d):\ngot %v\nwant %v", + it.filename, x, y, rgba(m.At(x, y)), rgba(g.At(x, y))) + continue loop + } + } + } + if imageFormat == "gif" { + // Each frame of a GIF can have a frame-local palette override the + // GIF-global palette. Thus, image.Decode can yield a different ColorModel + // than image.DecodeConfig. + continue + } + c, _, err := decodeConfig(it.filename) + if err != nil { + t.Errorf("%s: %v", it.filename, err) + continue loop + } + if m.ColorModel() != c.ColorModel { + t.Errorf("%s: color models differ", it.filename) + continue loop + } + } +} diff --git a/src/image/draw/bench_test.go b/src/image/draw/bench_test.go new file mode 100644 index 0000000..831fd95 --- /dev/null +++ b/src/image/draw/bench_test.go @@ -0,0 +1,263 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package draw + +import ( + "image" + "image/color" + "reflect" + "testing" +) + +const ( + dstw, dsth = 640, 480 + srcw, srch = 400, 300 +) + +var palette = color.Palette{ + color.Black, + color.White, +} + +// bench benchmarks drawing src and mask images onto a dst image with the +// given op and the color models to create those images from. +// The created images' pixels are initialized to non-zero values. +func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) { + b.StopTimer() + + var dst Image + switch dcm { + case color.RGBAModel: + dst1 := image.NewRGBA(image.Rect(0, 0, dstw, dsth)) + for y := 0; y < dsth; y++ { + for x := 0; x < dstw; x++ { + dst1.SetRGBA(x, y, color.RGBA{ + uint8(5 * x % 0x100), + uint8(7 * y % 0x100), + uint8((7*x + 5*y) % 0x100), + 0xff, + }) + } + } + dst = dst1 + case color.RGBA64Model: + dst1 := image.NewRGBA64(image.Rect(0, 0, dstw, dsth)) + for y := 0; y < dsth; y++ { + for x := 0; x < dstw; x++ { + dst1.SetRGBA64(x, y, color.RGBA64{ + uint16(53 * x % 0x10000), + uint16(59 * y % 0x10000), + uint16((59*x + 53*y) % 0x10000), + 0xffff, + }) + } + } + dst = dst1 + default: + // The == operator isn't defined on a color.Palette (a slice), so we + // use reflection. + if reflect.DeepEqual(dcm, palette) { + dst1 := image.NewPaletted(image.Rect(0, 0, dstw, dsth), palette) + for y := 0; y < dsth; y++ { + for x := 0; x < dstw; x++ { + dst1.SetColorIndex(x, y, uint8(x^y)&1) + } + } + dst = dst1 + } else { + b.Fatal("unknown destination color model", dcm) + } + } + + var src image.Image + switch scm { + case nil: + src = &image.Uniform{C: color.RGBA{0x11, 0x22, 0x33, 0x44}} + case color.CMYKModel: + src1 := image.NewCMYK(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + src1.SetCMYK(x, y, color.CMYK{ + uint8(13 * x % 0x100), + uint8(11 * y % 0x100), + uint8((11*x + 13*y) % 0x100), + uint8((31*x + 37*y) % 0x100), + }) + } + } + src = src1 + case color.GrayModel: + src1 := image.NewGray(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + src1.SetGray(x, y, color.Gray{ + uint8((11*x + 13*y) % 0x100), + }) + } + } + src = src1 + case color.RGBAModel: + src1 := image.NewRGBA(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + src1.SetRGBA(x, y, color.RGBA{ + uint8(13 * x % 0x80), + uint8(11 * y % 0x80), + uint8((11*x + 13*y) % 0x80), + 0x7f, + }) + } + } + src = src1 + case color.RGBA64Model: + src1 := image.NewRGBA64(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + src1.SetRGBA64(x, y, color.RGBA64{ + uint16(103 * x % 0x8000), + uint16(101 * y % 0x8000), + uint16((101*x + 103*y) % 0x8000), + 0x7fff, + }) + } + } + src = src1 + case color.NRGBAModel: + src1 := image.NewNRGBA(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + src1.SetNRGBA(x, y, color.NRGBA{ + uint8(13 * x % 0x100), + uint8(11 * y % 0x100), + uint8((11*x + 13*y) % 0x100), + 0x7f, + }) + } + } + src = src1 + case color.YCbCrModel: + yy := make([]uint8, srcw*srch) + cb := make([]uint8, srcw*srch) + cr := make([]uint8, srcw*srch) + for i := range yy { + yy[i] = uint8(3 * i % 0x100) + cb[i] = uint8(5 * i % 0x100) + cr[i] = uint8(7 * i % 0x100) + } + src = &image.YCbCr{ + Y: yy, + Cb: cb, + Cr: cr, + YStride: srcw, + CStride: srcw, + SubsampleRatio: image.YCbCrSubsampleRatio444, + Rect: image.Rect(0, 0, srcw, srch), + } + default: + b.Fatal("unknown source color model", scm) + } + + var mask image.Image + switch mcm { + case nil: + // No-op. + case color.AlphaModel: + mask1 := image.NewAlpha(image.Rect(0, 0, srcw, srch)) + for y := 0; y < srch; y++ { + for x := 0; x < srcw; x++ { + a := uint8((23*x + 29*y) % 0x100) + // Glyph masks are typically mostly zero, + // so we only set a quarter of mask1's pixels. + if a >= 0xc0 { + mask1.SetAlpha(x, y, color.Alpha{a}) + } + } + } + mask = mask1 + default: + b.Fatal("unknown mask color model", mcm) + } + + b.StartTimer() + for i := 0; i < b.N; i++ { + // Scatter the destination rectangle to draw into. + x := 3 * i % (dstw - srcw) + y := 7 * i % (dsth - srch) + + DrawMask(dst, dst.Bounds().Add(image.Pt(x, y)), src, image.ZP, mask, image.ZP, op) + } +} + +// The BenchmarkFoo functions exercise a drawFoo fast-path function in draw.go. + +func BenchmarkFillOver(b *testing.B) { + bench(b, color.RGBAModel, nil, nil, Over) +} + +func BenchmarkFillSrc(b *testing.B) { + bench(b, color.RGBAModel, nil, nil, Src) +} + +func BenchmarkCopyOver(b *testing.B) { + bench(b, color.RGBAModel, color.RGBAModel, nil, Over) +} + +func BenchmarkCopySrc(b *testing.B) { + bench(b, color.RGBAModel, color.RGBAModel, nil, Src) +} + +func BenchmarkNRGBAOver(b *testing.B) { + bench(b, color.RGBAModel, color.NRGBAModel, nil, Over) +} + +func BenchmarkNRGBASrc(b *testing.B) { + bench(b, color.RGBAModel, color.NRGBAModel, nil, Src) +} + +func BenchmarkYCbCr(b *testing.B) { + bench(b, color.RGBAModel, color.YCbCrModel, nil, Over) +} + +func BenchmarkGray(b *testing.B) { + bench(b, color.RGBAModel, color.GrayModel, nil, Over) +} + +func BenchmarkCMYK(b *testing.B) { + bench(b, color.RGBAModel, color.CMYKModel, nil, Over) +} + +func BenchmarkGlyphOver(b *testing.B) { + bench(b, color.RGBAModel, nil, color.AlphaModel, Over) +} + +func BenchmarkRGBA(b *testing.B) { + bench(b, color.RGBAModel, color.RGBA64Model, nil, Src) +} + +func BenchmarkPalettedFill(b *testing.B) { + bench(b, palette, nil, nil, Src) +} + +func BenchmarkPalettedRGBA(b *testing.B) { + bench(b, palette, color.RGBAModel, nil, Src) +} + +// The BenchmarkGenericFoo functions exercise the generic, slow-path code. + +func BenchmarkGenericOver(b *testing.B) { + bench(b, color.RGBA64Model, color.RGBA64Model, nil, Over) +} + +func BenchmarkGenericMaskOver(b *testing.B) { + bench(b, color.RGBA64Model, color.RGBA64Model, color.AlphaModel, Over) +} + +func BenchmarkGenericSrc(b *testing.B) { + bench(b, color.RGBA64Model, color.RGBA64Model, nil, Src) +} + +func BenchmarkGenericMaskSrc(b *testing.B) { + bench(b, color.RGBA64Model, color.RGBA64Model, color.AlphaModel, Src) +} diff --git a/src/image/draw/clip_test.go b/src/image/draw/clip_test.go new file mode 100644 index 0000000..0abf53e --- /dev/null +++ b/src/image/draw/clip_test.go @@ -0,0 +1,205 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package draw + +import ( + "image" + "testing" +) + +type clipTest struct { + desc string + r, dr, sr, mr image.Rectangle + sp, mp image.Point + nilMask bool + r0 image.Rectangle + sp0, mp0 image.Point +} + +var clipTests = []clipTest{ + // The following tests all have a nil mask. + { + "basic", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 100, 100), + image.ZR, + image.ZP, + image.ZP, + true, + image.Rect(0, 0, 100, 100), + image.ZP, + image.ZP, + }, + { + "clip dr", + image.Rect(0, 0, 100, 100), + image.Rect(40, 40, 60, 60), + image.Rect(0, 0, 100, 100), + image.ZR, + image.ZP, + image.ZP, + true, + image.Rect(40, 40, 60, 60), + image.Pt(40, 40), + image.ZP, + }, + { + "clip sr", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 100, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.ZP, + image.ZP, + true, + image.Rect(20, 20, 80, 80), + image.Pt(20, 20), + image.ZP, + }, + { + "clip dr and sr", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.ZP, + image.ZP, + true, + image.Rect(20, 20, 50, 80), + image.Pt(20, 20), + image.ZP, + }, + { + "clip dr and sr, sp outside sr (top-left)", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.Pt(15, 8), + image.ZP, + true, + image.Rect(5, 12, 50, 72), + image.Pt(20, 20), + image.ZP, + }, + { + "clip dr and sr, sp outside sr (middle-left)", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.Pt(15, 66), + image.ZP, + true, + image.Rect(5, 0, 50, 14), + image.Pt(20, 66), + image.ZP, + }, + { + "clip dr and sr, sp outside sr (bottom-left)", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.Pt(15, 91), + image.ZP, + true, + image.ZR, + image.Pt(15, 91), + image.ZP, + }, + { + "clip dr and sr, sp inside sr", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(20, 20, 80, 80), + image.ZR, + image.Pt(44, 33), + image.ZP, + true, + image.Rect(0, 0, 36, 47), + image.Pt(44, 33), + image.ZP, + }, + + // The following tests all have a non-nil mask. + { + "basic mask", + image.Rect(0, 0, 80, 80), + image.Rect(20, 0, 100, 80), + image.Rect(0, 0, 50, 49), + image.Rect(0, 0, 46, 47), + image.ZP, + image.ZP, + false, + image.Rect(20, 0, 46, 47), + image.Pt(20, 0), + image.Pt(20, 0), + }, + { + "clip sr and mr", + image.Rect(0, 0, 100, 100), + image.Rect(0, 0, 100, 100), + image.Rect(23, 23, 55, 86), + image.Rect(44, 44, 87, 58), + image.Pt(10, 10), + image.Pt(11, 11), + false, + image.Rect(33, 33, 45, 47), + image.Pt(43, 43), + image.Pt(44, 44), + }, +} + +func TestClip(t *testing.T) { + dst0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) + src0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) + mask0 := image.NewRGBA(image.Rect(0, 0, 100, 100)) + for _, c := range clipTests { + dst := dst0.SubImage(c.dr).(*image.RGBA) + src := src0.SubImage(c.sr).(*image.RGBA) + r, sp, mp := c.r, c.sp, c.mp + if c.nilMask { + clip(dst, &r, src, &sp, nil, nil) + } else { + clip(dst, &r, src, &sp, mask0.SubImage(c.mr), &mp) + } + + // Check that the actual results equal the expected results. + if !c.r0.Eq(r) { + t.Errorf("%s: clip rectangle want %v got %v", c.desc, c.r0, r) + continue + } + if !c.sp0.Eq(sp) { + t.Errorf("%s: sp want %v got %v", c.desc, c.sp0, sp) + continue + } + if !c.nilMask { + if !c.mp0.Eq(mp) { + t.Errorf("%s: mp want %v got %v", c.desc, c.mp0, mp) + continue + } + } + + // Check that the clipped rectangle is contained by the dst / src / mask + // rectangles, in their respective coordinate spaces. + if !r.In(c.dr) { + t.Errorf("%s: c.dr %v does not contain r %v", c.desc, c.dr, r) + } + // sr is r translated into src's coordinate space. + sr := r.Add(c.sp.Sub(c.dr.Min)) + if !sr.In(c.sr) { + t.Errorf("%s: c.sr %v does not contain sr %v", c.desc, c.sr, sr) + } + if !c.nilMask { + // mr is r translated into mask's coordinate space. + mr := r.Add(c.mp.Sub(c.dr.Min)) + if !mr.In(c.mr) { + t.Errorf("%s: c.mr %v does not contain mr %v", c.desc, c.mr, mr) + } + } + } +} diff --git a/src/image/draw/draw.go b/src/image/draw/draw.go new file mode 100644 index 0000000..13f6668 --- /dev/null +++ b/src/image/draw/draw.go @@ -0,0 +1,730 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package draw provides image composition functions. +// +// See "The Go image/draw package" for an introduction to this package: +// https://golang.org/doc/articles/image_draw.html +package draw + +import ( + "image" + "image/color" + "image/internal/imageutil" +) + +// m is the maximum color value returned by image.Color.RGBA. +const m = 1<<16 - 1 + +// Image is an image.Image with a Set method to change a single pixel. +type Image interface { + image.Image + Set(x, y int, c color.Color) +} + +// RGBA64Image extends both the Image and image.RGBA64Image interfaces with a +// SetRGBA64 method to change a single pixel. SetRGBA64 is equivalent to +// calling Set, but it can avoid allocations from converting concrete color +// types to the color.Color interface type. +type RGBA64Image interface { + image.RGBA64Image + Set(x, y int, c color.Color) + SetRGBA64(x, y int, c color.RGBA64) +} + +// Quantizer produces a palette for an image. +type Quantizer interface { + // Quantize appends up to cap(p) - len(p) colors to p and returns the + // updated palette suitable for converting m to a paletted image. + Quantize(p color.Palette, m image.Image) color.Palette +} + +// Op is a Porter-Duff compositing operator. +type Op int + +const ( + // Over specifies ``(src in mask) over dst''. + Over Op = iota + // Src specifies ``src in mask''. + Src +) + +// Draw implements the Drawer interface by calling the Draw function with this +// Op. +func (op Op) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point) { + DrawMask(dst, r, src, sp, nil, image.Point{}, op) +} + +// Drawer contains the Draw method. +type Drawer interface { + // Draw aligns r.Min in dst with sp in src and then replaces the + // rectangle r in dst with the result of drawing src on dst. + Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point) +} + +// FloydSteinberg is a Drawer that is the Src Op with Floyd-Steinberg error +// diffusion. +var FloydSteinberg Drawer = floydSteinberg{} + +type floydSteinberg struct{} + +func (floydSteinberg) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point) { + clip(dst, &r, src, &sp, nil, nil) + if r.Empty() { + return + } + drawPaletted(dst, r, src, sp, true) +} + +// clip clips r against each image's bounds (after translating into the +// destination image's coordinate space) and shifts the points sp and mp by +// the same amount as the change in r.Min. +func clip(dst Image, r *image.Rectangle, src image.Image, sp *image.Point, mask image.Image, mp *image.Point) { + orig := r.Min + *r = r.Intersect(dst.Bounds()) + *r = r.Intersect(src.Bounds().Add(orig.Sub(*sp))) + if mask != nil { + *r = r.Intersect(mask.Bounds().Add(orig.Sub(*mp))) + } + dx := r.Min.X - orig.X + dy := r.Min.Y - orig.Y + if dx == 0 && dy == 0 { + return + } + sp.X += dx + sp.Y += dy + if mp != nil { + mp.X += dx + mp.Y += dy + } +} + +func processBackward(dst image.Image, r image.Rectangle, src image.Image, sp image.Point) bool { + return dst == src && + r.Overlaps(r.Add(sp.Sub(r.Min))) && + (sp.Y < r.Min.Y || (sp.Y == r.Min.Y && sp.X < r.Min.X)) +} + +// Draw calls DrawMask with a nil mask. +func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op) { + DrawMask(dst, r, src, sp, nil, image.Point{}, op) +} + +// DrawMask aligns r.Min in dst with sp in src and mp in mask and then replaces the rectangle r +// in dst with the result of a Porter-Duff composition. A nil mask is treated as opaque. +func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op) { + clip(dst, &r, src, &sp, mask, &mp) + if r.Empty() { + return + } + + // Fast paths for special cases. If none of them apply, then we fall back to a general but slow implementation. + switch dst0 := dst.(type) { + case *image.RGBA: + if op == Over { + if mask == nil { + switch src0 := src.(type) { + case *image.Uniform: + sr, sg, sb, sa := src0.RGBA() + if sa == 0xffff { + drawFillSrc(dst0, r, sr, sg, sb, sa) + } else { + drawFillOver(dst0, r, sr, sg, sb, sa) + } + return + case *image.RGBA: + drawCopyOver(dst0, r, src0, sp) + return + case *image.NRGBA: + drawNRGBAOver(dst0, r, src0, sp) + return + case *image.YCbCr: + // An image.YCbCr is always fully opaque, and so if the + // mask is nil (i.e. fully opaque) then the op is + // effectively always Src. Similarly for image.Gray and + // image.CMYK. + if imageutil.DrawYCbCr(dst0, r, src0, sp) { + return + } + case *image.Gray: + drawGray(dst0, r, src0, sp) + return + case *image.CMYK: + drawCMYK(dst0, r, src0, sp) + return + } + } else if mask0, ok := mask.(*image.Alpha); ok { + switch src0 := src.(type) { + case *image.Uniform: + drawGlyphOver(dst0, r, src0, mask0, mp) + return + } + } + } else { + if mask == nil { + switch src0 := src.(type) { + case *image.Uniform: + sr, sg, sb, sa := src0.RGBA() + drawFillSrc(dst0, r, sr, sg, sb, sa) + return + case *image.RGBA: + drawCopySrc(dst0, r, src0, sp) + return + case *image.NRGBA: + drawNRGBASrc(dst0, r, src0, sp) + return + case *image.YCbCr: + if imageutil.DrawYCbCr(dst0, r, src0, sp) { + return + } + case *image.Gray: + drawGray(dst0, r, src0, sp) + return + case *image.CMYK: + drawCMYK(dst0, r, src0, sp) + return + } + } + } + drawRGBA(dst0, r, src, sp, mask, mp, op) + return + case *image.Paletted: + if op == Src && mask == nil { + if src0, ok := src.(*image.Uniform); ok { + colorIndex := uint8(dst0.Palette.Index(src0.C)) + i0 := dst0.PixOffset(r.Min.X, r.Min.Y) + i1 := i0 + r.Dx() + for i := i0; i < i1; i++ { + dst0.Pix[i] = colorIndex + } + firstRow := dst0.Pix[i0:i1] + for y := r.Min.Y + 1; y < r.Max.Y; y++ { + i0 += dst0.Stride + i1 += dst0.Stride + copy(dst0.Pix[i0:i1], firstRow) + } + return + } else if !processBackward(dst, r, src, sp) { + drawPaletted(dst0, r, src, sp, false) + return + } + } + } + + x0, x1, dx := r.Min.X, r.Max.X, 1 + y0, y1, dy := r.Min.Y, r.Max.Y, 1 + if processBackward(dst, r, src, sp) { + x0, x1, dx = x1-1, x0-1, -1 + y0, y1, dy = y1-1, y0-1, -1 + } + + var out color.RGBA64 + sy := sp.Y + y0 - r.Min.Y + my := mp.Y + y0 - r.Min.Y + for y := y0; y != y1; y, sy, my = y+dy, sy+dy, my+dy { + sx := sp.X + x0 - r.Min.X + mx := mp.X + x0 - r.Min.X + for x := x0; x != x1; x, sx, mx = x+dx, sx+dx, mx+dx { + ma := uint32(m) + if mask != nil { + _, _, _, ma = mask.At(mx, my).RGBA() + } + switch { + case ma == 0: + if op == Over { + // No-op. + } else { + dst.Set(x, y, color.Transparent) + } + case ma == m && op == Src: + dst.Set(x, y, src.At(sx, sy)) + default: + sr, sg, sb, sa := src.At(sx, sy).RGBA() + if op == Over { + dr, dg, db, da := dst.At(x, y).RGBA() + a := m - (sa * ma / m) + out.R = uint16((dr*a + sr*ma) / m) + out.G = uint16((dg*a + sg*ma) / m) + out.B = uint16((db*a + sb*ma) / m) + out.A = uint16((da*a + sa*ma) / m) + } else { + out.R = uint16(sr * ma / m) + out.G = uint16(sg * ma / m) + out.B = uint16(sb * ma / m) + out.A = uint16(sa * ma / m) + } + // The third argument is &out instead of out (and out is + // declared outside of the inner loop) to avoid the implicit + // conversion to color.Color here allocating memory in the + // inner loop if sizeof(color.RGBA64) > sizeof(uintptr). + dst.Set(x, y, &out) + } + } + } +} + +func drawFillOver(dst *image.RGBA, r image.Rectangle, sr, sg, sb, sa uint32) { + // The 0x101 is here for the same reason as in drawRGBA. + a := (m - sa) * 0x101 + i0 := dst.PixOffset(r.Min.X, r.Min.Y) + i1 := i0 + r.Dx()*4 + for y := r.Min.Y; y != r.Max.Y; y++ { + for i := i0; i < i1; i += 4 { + dr := &dst.Pix[i+0] + dg := &dst.Pix[i+1] + db := &dst.Pix[i+2] + da := &dst.Pix[i+3] + + *dr = uint8((uint32(*dr)*a/m + sr) >> 8) + *dg = uint8((uint32(*dg)*a/m + sg) >> 8) + *db = uint8((uint32(*db)*a/m + sb) >> 8) + *da = uint8((uint32(*da)*a/m + sa) >> 8) + } + i0 += dst.Stride + i1 += dst.Stride + } +} + +func drawFillSrc(dst *image.RGBA, r image.Rectangle, sr, sg, sb, sa uint32) { + sr8 := uint8(sr >> 8) + sg8 := uint8(sg >> 8) + sb8 := uint8(sb >> 8) + sa8 := uint8(sa >> 8) + // The built-in copy function is faster than a straightforward for loop to fill the destination with + // the color, but copy requires a slice source. We therefore use a for loop to fill the first row, and + // then use the first row as the slice source for the remaining rows. + i0 := dst.PixOffset(r.Min.X, r.Min.Y) + i1 := i0 + r.Dx()*4 + for i := i0; i < i1; i += 4 { + dst.Pix[i+0] = sr8 + dst.Pix[i+1] = sg8 + dst.Pix[i+2] = sb8 + dst.Pix[i+3] = sa8 + } + firstRow := dst.Pix[i0:i1] + for y := r.Min.Y + 1; y < r.Max.Y; y++ { + i0 += dst.Stride + i1 += dst.Stride + copy(dst.Pix[i0:i1], firstRow) + } +} + +func drawCopyOver(dst *image.RGBA, r image.Rectangle, src *image.RGBA, sp image.Point) { + dx, dy := r.Dx(), r.Dy() + d0 := dst.PixOffset(r.Min.X, r.Min.Y) + s0 := src.PixOffset(sp.X, sp.Y) + var ( + ddelta, sdelta int + i0, i1, idelta int + ) + if r.Min.Y < sp.Y || r.Min.Y == sp.Y && r.Min.X <= sp.X { + ddelta = dst.Stride + sdelta = src.Stride + i0, i1, idelta = 0, dx*4, +4 + } else { + // If the source start point is higher than the destination start point, or equal height but to the left, + // then we compose the rows in right-to-left, bottom-up order instead of left-to-right, top-down. + d0 += (dy - 1) * dst.Stride + s0 += (dy - 1) * src.Stride + ddelta = -dst.Stride + sdelta = -src.Stride + i0, i1, idelta = (dx-1)*4, -4, -4 + } + for ; dy > 0; dy-- { + dpix := dst.Pix[d0:] + spix := src.Pix[s0:] + for i := i0; i != i1; i += idelta { + s := spix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + sr := uint32(s[0]) * 0x101 + sg := uint32(s[1]) * 0x101 + sb := uint32(s[2]) * 0x101 + sa := uint32(s[3]) * 0x101 + + // The 0x101 is here for the same reason as in drawRGBA. + a := (m - sa) * 0x101 + + d := dpix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + d[0] = uint8((uint32(d[0])*a/m + sr) >> 8) + d[1] = uint8((uint32(d[1])*a/m + sg) >> 8) + d[2] = uint8((uint32(d[2])*a/m + sb) >> 8) + d[3] = uint8((uint32(d[3])*a/m + sa) >> 8) + } + d0 += ddelta + s0 += sdelta + } +} + +func drawCopySrc(dst *image.RGBA, r image.Rectangle, src *image.RGBA, sp image.Point) { + n, dy := 4*r.Dx(), r.Dy() + d0 := dst.PixOffset(r.Min.X, r.Min.Y) + s0 := src.PixOffset(sp.X, sp.Y) + var ddelta, sdelta int + if r.Min.Y <= sp.Y { + ddelta = dst.Stride + sdelta = src.Stride + } else { + // If the source start point is higher than the destination start + // point, then we compose the rows in bottom-up order instead of + // top-down. Unlike the drawCopyOver function, we don't have to check + // the x coordinates because the built-in copy function can handle + // overlapping slices. + d0 += (dy - 1) * dst.Stride + s0 += (dy - 1) * src.Stride + ddelta = -dst.Stride + sdelta = -src.Stride + } + for ; dy > 0; dy-- { + copy(dst.Pix[d0:d0+n], src.Pix[s0:s0+n]) + d0 += ddelta + s0 += sdelta + } +} + +func drawNRGBAOver(dst *image.RGBA, r image.Rectangle, src *image.NRGBA, sp image.Point) { + i0 := (r.Min.X - dst.Rect.Min.X) * 4 + i1 := (r.Max.X - dst.Rect.Min.X) * 4 + si0 := (sp.X - src.Rect.Min.X) * 4 + yMax := r.Max.Y - dst.Rect.Min.Y + + y := r.Min.Y - dst.Rect.Min.Y + sy := sp.Y - src.Rect.Min.Y + for ; y != yMax; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + spix := src.Pix[sy*src.Stride:] + + for i, si := i0, si0; i < i1; i, si = i+4, si+4 { + // Convert from non-premultiplied color to pre-multiplied color. + s := spix[si : si+4 : si+4] // Small cap improves performance, see https://golang.org/issue/27857 + sa := uint32(s[3]) * 0x101 + sr := uint32(s[0]) * sa / 0xff + sg := uint32(s[1]) * sa / 0xff + sb := uint32(s[2]) * sa / 0xff + + d := dpix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + dr := uint32(d[0]) + dg := uint32(d[1]) + db := uint32(d[2]) + da := uint32(d[3]) + + // The 0x101 is here for the same reason as in drawRGBA. + a := (m - sa) * 0x101 + + d[0] = uint8((dr*a/m + sr) >> 8) + d[1] = uint8((dg*a/m + sg) >> 8) + d[2] = uint8((db*a/m + sb) >> 8) + d[3] = uint8((da*a/m + sa) >> 8) + } + } +} + +func drawNRGBASrc(dst *image.RGBA, r image.Rectangle, src *image.NRGBA, sp image.Point) { + i0 := (r.Min.X - dst.Rect.Min.X) * 4 + i1 := (r.Max.X - dst.Rect.Min.X) * 4 + si0 := (sp.X - src.Rect.Min.X) * 4 + yMax := r.Max.Y - dst.Rect.Min.Y + + y := r.Min.Y - dst.Rect.Min.Y + sy := sp.Y - src.Rect.Min.Y + for ; y != yMax; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + spix := src.Pix[sy*src.Stride:] + + for i, si := i0, si0; i < i1; i, si = i+4, si+4 { + // Convert from non-premultiplied color to pre-multiplied color. + s := spix[si : si+4 : si+4] // Small cap improves performance, see https://golang.org/issue/27857 + sa := uint32(s[3]) * 0x101 + sr := uint32(s[0]) * sa / 0xff + sg := uint32(s[1]) * sa / 0xff + sb := uint32(s[2]) * sa / 0xff + + d := dpix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + d[0] = uint8(sr >> 8) + d[1] = uint8(sg >> 8) + d[2] = uint8(sb >> 8) + d[3] = uint8(sa >> 8) + } + } +} + +func drawGray(dst *image.RGBA, r image.Rectangle, src *image.Gray, sp image.Point) { + i0 := (r.Min.X - dst.Rect.Min.X) * 4 + i1 := (r.Max.X - dst.Rect.Min.X) * 4 + si0 := (sp.X - src.Rect.Min.X) * 1 + yMax := r.Max.Y - dst.Rect.Min.Y + + y := r.Min.Y - dst.Rect.Min.Y + sy := sp.Y - src.Rect.Min.Y + for ; y != yMax; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + spix := src.Pix[sy*src.Stride:] + + for i, si := i0, si0; i < i1; i, si = i+4, si+1 { + p := spix[si] + d := dpix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + d[0] = p + d[1] = p + d[2] = p + d[3] = 255 + } + } +} + +func drawCMYK(dst *image.RGBA, r image.Rectangle, src *image.CMYK, sp image.Point) { + i0 := (r.Min.X - dst.Rect.Min.X) * 4 + i1 := (r.Max.X - dst.Rect.Min.X) * 4 + si0 := (sp.X - src.Rect.Min.X) * 4 + yMax := r.Max.Y - dst.Rect.Min.Y + + y := r.Min.Y - dst.Rect.Min.Y + sy := sp.Y - src.Rect.Min.Y + for ; y != yMax; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + spix := src.Pix[sy*src.Stride:] + + for i, si := i0, si0; i < i1; i, si = i+4, si+4 { + s := spix[si : si+4 : si+4] // Small cap improves performance, see https://golang.org/issue/27857 + d := dpix[i : i+4 : i+4] + d[0], d[1], d[2] = color.CMYKToRGB(s[0], s[1], s[2], s[3]) + d[3] = 255 + } + } +} + +func drawGlyphOver(dst *image.RGBA, r image.Rectangle, src *image.Uniform, mask *image.Alpha, mp image.Point) { + i0 := dst.PixOffset(r.Min.X, r.Min.Y) + i1 := i0 + r.Dx()*4 + mi0 := mask.PixOffset(mp.X, mp.Y) + sr, sg, sb, sa := src.RGBA() + for y, my := r.Min.Y, mp.Y; y != r.Max.Y; y, my = y+1, my+1 { + for i, mi := i0, mi0; i < i1; i, mi = i+4, mi+1 { + ma := uint32(mask.Pix[mi]) + if ma == 0 { + continue + } + ma |= ma << 8 + + // The 0x101 is here for the same reason as in drawRGBA. + a := (m - (sa * ma / m)) * 0x101 + + d := dst.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + d[0] = uint8((uint32(d[0])*a + sr*ma) / m >> 8) + d[1] = uint8((uint32(d[1])*a + sg*ma) / m >> 8) + d[2] = uint8((uint32(d[2])*a + sb*ma) / m >> 8) + d[3] = uint8((uint32(d[3])*a + sa*ma) / m >> 8) + } + i0 += dst.Stride + i1 += dst.Stride + mi0 += mask.Stride + } +} + +func drawRGBA(dst *image.RGBA, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op) { + x0, x1, dx := r.Min.X, r.Max.X, 1 + y0, y1, dy := r.Min.Y, r.Max.Y, 1 + if image.Image(dst) == src && r.Overlaps(r.Add(sp.Sub(r.Min))) { + if sp.Y < r.Min.Y || sp.Y == r.Min.Y && sp.X < r.Min.X { + x0, x1, dx = x1-1, x0-1, -1 + y0, y1, dy = y1-1, y0-1, -1 + } + } + + sy := sp.Y + y0 - r.Min.Y + my := mp.Y + y0 - r.Min.Y + sx0 := sp.X + x0 - r.Min.X + mx0 := mp.X + x0 - r.Min.X + sx1 := sx0 + (x1 - x0) + i0 := dst.PixOffset(x0, y0) + di := dx * 4 + for y := y0; y != y1; y, sy, my = y+dy, sy+dy, my+dy { + for i, sx, mx := i0, sx0, mx0; sx != sx1; i, sx, mx = i+di, sx+dx, mx+dx { + ma := uint32(m) + if mask != nil { + _, _, _, ma = mask.At(mx, my).RGBA() + } + sr, sg, sb, sa := src.At(sx, sy).RGBA() + d := dst.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + if op == Over { + dr := uint32(d[0]) + dg := uint32(d[1]) + db := uint32(d[2]) + da := uint32(d[3]) + + // dr, dg, db and da are all 8-bit color at the moment, ranging in [0,255]. + // We work in 16-bit color, and so would normally do: + // dr |= dr << 8 + // and similarly for dg, db and da, but instead we multiply a + // (which is a 16-bit color, ranging in [0,65535]) by 0x101. + // This yields the same result, but is fewer arithmetic operations. + a := (m - (sa * ma / m)) * 0x101 + + d[0] = uint8((dr*a + sr*ma) / m >> 8) + d[1] = uint8((dg*a + sg*ma) / m >> 8) + d[2] = uint8((db*a + sb*ma) / m >> 8) + d[3] = uint8((da*a + sa*ma) / m >> 8) + + } else { + d[0] = uint8(sr * ma / m >> 8) + d[1] = uint8(sg * ma / m >> 8) + d[2] = uint8(sb * ma / m >> 8) + d[3] = uint8(sa * ma / m >> 8) + } + } + i0 += dy * dst.Stride + } +} + +// clamp clamps i to the interval [0, 0xffff]. +func clamp(i int32) int32 { + if i < 0 { + return 0 + } + if i > 0xffff { + return 0xffff + } + return i +} + +// sqDiff returns the squared-difference of x and y, shifted by 2 so that +// adding four of those won't overflow a uint32. +// +// x and y are both assumed to be in the range [0, 0xffff]. +func sqDiff(x, y int32) uint32 { + // This is an optimized code relying on the overflow/wrap around + // properties of unsigned integers operations guaranteed by the language + // spec. See sqDiff from the image/color package for more details. + d := uint32(x - y) + return (d * d) >> 2 +} + +func drawPaletted(dst Image, r image.Rectangle, src image.Image, sp image.Point, floydSteinberg bool) { + // TODO(nigeltao): handle the case where the dst and src overlap. + // Does it even make sense to try and do Floyd-Steinberg whilst + // walking the image backward (right-to-left bottom-to-top)? + + // If dst is an *image.Paletted, we have a fast path for dst.Set and + // dst.At. The dst.Set equivalent is a batch version of the algorithm + // used by color.Palette's Index method in image/color/color.go, plus + // optional Floyd-Steinberg error diffusion. + palette, pix, stride := [][4]int32(nil), []byte(nil), 0 + if p, ok := dst.(*image.Paletted); ok { + palette = make([][4]int32, len(p.Palette)) + for i, col := range p.Palette { + r, g, b, a := col.RGBA() + palette[i][0] = int32(r) + palette[i][1] = int32(g) + palette[i][2] = int32(b) + palette[i][3] = int32(a) + } + pix, stride = p.Pix[p.PixOffset(r.Min.X, r.Min.Y):], p.Stride + } + + // quantErrorCurr and quantErrorNext are the Floyd-Steinberg quantization + // errors that have been propagated to the pixels in the current and next + // rows. The +2 simplifies calculation near the edges. + var quantErrorCurr, quantErrorNext [][4]int32 + if floydSteinberg { + quantErrorCurr = make([][4]int32, r.Dx()+2) + quantErrorNext = make([][4]int32, r.Dx()+2) + } + pxRGBA := func(x, y int) (r, g, b, a uint32) { return src.At(x, y).RGBA() } + // Fast paths for special cases to avoid excessive use of the color.Color + // interface which escapes to the heap but need to be discovered for + // each pixel on r. See also https://golang.org/issues/15759. + switch src0 := src.(type) { + case *image.RGBA: + pxRGBA = func(x, y int) (r, g, b, a uint32) { return src0.RGBAAt(x, y).RGBA() } + case *image.NRGBA: + pxRGBA = func(x, y int) (r, g, b, a uint32) { return src0.NRGBAAt(x, y).RGBA() } + case *image.YCbCr: + pxRGBA = func(x, y int) (r, g, b, a uint32) { return src0.YCbCrAt(x, y).RGBA() } + } + + // Loop over each source pixel. + out := color.RGBA64{A: 0xffff} + for y := 0; y != r.Dy(); y++ { + for x := 0; x != r.Dx(); x++ { + // er, eg and eb are the pixel's R,G,B values plus the + // optional Floyd-Steinberg error. + sr, sg, sb, sa := pxRGBA(sp.X+x, sp.Y+y) + er, eg, eb, ea := int32(sr), int32(sg), int32(sb), int32(sa) + if floydSteinberg { + er = clamp(er + quantErrorCurr[x+1][0]/16) + eg = clamp(eg + quantErrorCurr[x+1][1]/16) + eb = clamp(eb + quantErrorCurr[x+1][2]/16) + ea = clamp(ea + quantErrorCurr[x+1][3]/16) + } + + if palette != nil { + // Find the closest palette color in Euclidean R,G,B,A space: + // the one that minimizes sum-squared-difference. + // TODO(nigeltao): consider smarter algorithms. + bestIndex, bestSum := 0, uint32(1<<32-1) + for index, p := range palette { + sum := sqDiff(er, p[0]) + sqDiff(eg, p[1]) + sqDiff(eb, p[2]) + sqDiff(ea, p[3]) + if sum < bestSum { + bestIndex, bestSum = index, sum + if sum == 0 { + break + } + } + } + pix[y*stride+x] = byte(bestIndex) + + if !floydSteinberg { + continue + } + er -= palette[bestIndex][0] + eg -= palette[bestIndex][1] + eb -= palette[bestIndex][2] + ea -= palette[bestIndex][3] + + } else { + out.R = uint16(er) + out.G = uint16(eg) + out.B = uint16(eb) + out.A = uint16(ea) + // The third argument is &out instead of out (and out is + // declared outside of the inner loop) to avoid the implicit + // conversion to color.Color here allocating memory in the + // inner loop if sizeof(color.RGBA64) > sizeof(uintptr). + dst.Set(r.Min.X+x, r.Min.Y+y, &out) + + if !floydSteinberg { + continue + } + sr, sg, sb, sa = dst.At(r.Min.X+x, r.Min.Y+y).RGBA() + er -= int32(sr) + eg -= int32(sg) + eb -= int32(sb) + ea -= int32(sa) + } + + // Propagate the Floyd-Steinberg quantization error. + quantErrorNext[x+0][0] += er * 3 + quantErrorNext[x+0][1] += eg * 3 + quantErrorNext[x+0][2] += eb * 3 + quantErrorNext[x+0][3] += ea * 3 + quantErrorNext[x+1][0] += er * 5 + quantErrorNext[x+1][1] += eg * 5 + quantErrorNext[x+1][2] += eb * 5 + quantErrorNext[x+1][3] += ea * 5 + quantErrorNext[x+2][0] += er * 1 + quantErrorNext[x+2][1] += eg * 1 + quantErrorNext[x+2][2] += eb * 1 + quantErrorNext[x+2][3] += ea * 1 + quantErrorCurr[x+2][0] += er * 7 + quantErrorCurr[x+2][1] += eg * 7 + quantErrorCurr[x+2][2] += eb * 7 + quantErrorCurr[x+2][3] += ea * 7 + } + + // Recycle the quantization error buffers. + if floydSteinberg { + quantErrorCurr, quantErrorNext = quantErrorNext, quantErrorCurr + for i := range quantErrorNext { + quantErrorNext[i] = [4]int32{} + } + } + } +} diff --git a/src/image/draw/draw_test.go b/src/image/draw/draw_test.go new file mode 100644 index 0000000..9c5a118 --- /dev/null +++ b/src/image/draw/draw_test.go @@ -0,0 +1,520 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package draw + +import ( + "image" + "image/color" + "image/png" + "os" + "testing" + "testing/quick" +) + +func eq(c0, c1 color.Color) bool { + r0, g0, b0, a0 := c0.RGBA() + r1, g1, b1, a1 := c1.RGBA() + return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1 +} + +func fillBlue(alpha int) image.Image { + return image.NewUniform(color.RGBA{0, 0, uint8(alpha), uint8(alpha)}) +} + +func fillAlpha(alpha int) image.Image { + return image.NewUniform(color.Alpha{uint8(alpha)}) +} + +func vgradGreen(alpha int) image.Image { + m := image.NewRGBA(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.RGBA{0, uint8(y * alpha / 15), 0, uint8(alpha)}) + } + } + return m +} + +func vgradAlpha(alpha int) image.Image { + m := image.NewAlpha(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.Alpha{uint8(y * alpha / 15)}) + } + } + return m +} + +func vgradGreenNRGBA(alpha int) image.Image { + m := image.NewNRGBA(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.RGBA{0, uint8(y * 0x11), 0, uint8(alpha)}) + } + } + return m +} + +func vgradCr() image.Image { + m := &image.YCbCr{ + Y: make([]byte, 16*16), + Cb: make([]byte, 16*16), + Cr: make([]byte, 16*16), + YStride: 16, + CStride: 16, + SubsampleRatio: image.YCbCrSubsampleRatio444, + Rect: image.Rect(0, 0, 16, 16), + } + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Cr[y*m.CStride+x] = uint8(y * 0x11) + } + } + return m +} + +func vgradGray() image.Image { + m := image.NewGray(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.Gray{uint8(y * 0x11)}) + } + } + return m +} + +func vgradMagenta() image.Image { + m := image.NewCMYK(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.CMYK{0, uint8(y * 0x11), 0, 0x3f}) + } + } + return m +} + +func hgradRed(alpha int) Image { + m := image.NewRGBA(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.RGBA{uint8(x * alpha / 15), 0, 0, uint8(alpha)}) + } + } + return m +} + +func gradYellow(alpha int) Image { + m := image.NewRGBA(image.Rect(0, 0, 16, 16)) + for y := 0; y < 16; y++ { + for x := 0; x < 16; x++ { + m.Set(x, y, color.RGBA{uint8(x * alpha / 15), uint8(y * alpha / 15), 0, uint8(alpha)}) + } + } + return m +} + +type drawTest struct { + desc string + src image.Image + mask image.Image + op Op + expected color.Color +} + +var drawTests = []drawTest{ + // Uniform mask (0% opaque). + {"nop", vgradGreen(255), fillAlpha(0), Over, color.RGBA{136, 0, 0, 255}}, + {"clear", vgradGreen(255), fillAlpha(0), Src, color.RGBA{0, 0, 0, 0}}, + // Uniform mask (100%, 75%, nil) and uniform source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 0, 90, 90}. + {"fill", fillBlue(90), fillAlpha(255), Over, color.RGBA{88, 0, 90, 255}}, + {"fillSrc", fillBlue(90), fillAlpha(255), Src, color.RGBA{0, 0, 90, 90}}, + {"fillAlpha", fillBlue(90), fillAlpha(192), Over, color.RGBA{100, 0, 68, 255}}, + {"fillAlphaSrc", fillBlue(90), fillAlpha(192), Src, color.RGBA{0, 0, 68, 68}}, + {"fillNil", fillBlue(90), nil, Over, color.RGBA{88, 0, 90, 255}}, + {"fillNilSrc", fillBlue(90), nil, Src, color.RGBA{0, 0, 90, 90}}, + // Uniform mask (100%, 75%, nil) and variable source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 48, 0, 90}. + {"copy", vgradGreen(90), fillAlpha(255), Over, color.RGBA{88, 48, 0, 255}}, + {"copySrc", vgradGreen(90), fillAlpha(255), Src, color.RGBA{0, 48, 0, 90}}, + {"copyAlpha", vgradGreen(90), fillAlpha(192), Over, color.RGBA{100, 36, 0, 255}}, + {"copyAlphaSrc", vgradGreen(90), fillAlpha(192), Src, color.RGBA{0, 36, 0, 68}}, + {"copyNil", vgradGreen(90), nil, Over, color.RGBA{88, 48, 0, 255}}, + {"copyNilSrc", vgradGreen(90), nil, Src, color.RGBA{0, 48, 0, 90}}, + // Uniform mask (100%, 75%, nil) and variable NRGBA source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 136, 0, 90} in NRGBA-space, which is {0, 48, 0, 90} in RGBA-space. + // The result pixel is different than in the "copy*" test cases because of rounding errors. + {"nrgba", vgradGreenNRGBA(90), fillAlpha(255), Over, color.RGBA{88, 46, 0, 255}}, + {"nrgbaSrc", vgradGreenNRGBA(90), fillAlpha(255), Src, color.RGBA{0, 46, 0, 90}}, + {"nrgbaAlpha", vgradGreenNRGBA(90), fillAlpha(192), Over, color.RGBA{100, 34, 0, 255}}, + {"nrgbaAlphaSrc", vgradGreenNRGBA(90), fillAlpha(192), Src, color.RGBA{0, 34, 0, 68}}, + {"nrgbaNil", vgradGreenNRGBA(90), nil, Over, color.RGBA{88, 46, 0, 255}}, + {"nrgbaNilSrc", vgradGreenNRGBA(90), nil, Src, color.RGBA{0, 46, 0, 90}}, + // Uniform mask (100%, 75%, nil) and variable YCbCr source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 0, 136} in YCbCr-space, which is {11, 38, 0, 255} in RGB-space. + {"ycbcr", vgradCr(), fillAlpha(255), Over, color.RGBA{11, 38, 0, 255}}, + {"ycbcrSrc", vgradCr(), fillAlpha(255), Src, color.RGBA{11, 38, 0, 255}}, + {"ycbcrAlpha", vgradCr(), fillAlpha(192), Over, color.RGBA{42, 28, 0, 255}}, + {"ycbcrAlphaSrc", vgradCr(), fillAlpha(192), Src, color.RGBA{8, 28, 0, 192}}, + {"ycbcrNil", vgradCr(), nil, Over, color.RGBA{11, 38, 0, 255}}, + {"ycbcrNilSrc", vgradCr(), nil, Src, color.RGBA{11, 38, 0, 255}}, + // Uniform mask (100%, 75%, nil) and variable Gray source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {136} in Gray-space, which is {136, 136, 136, 255} in RGBA-space. + {"gray", vgradGray(), fillAlpha(255), Over, color.RGBA{136, 136, 136, 255}}, + {"graySrc", vgradGray(), fillAlpha(255), Src, color.RGBA{136, 136, 136, 255}}, + {"grayAlpha", vgradGray(), fillAlpha(192), Over, color.RGBA{136, 102, 102, 255}}, + {"grayAlphaSrc", vgradGray(), fillAlpha(192), Src, color.RGBA{102, 102, 102, 192}}, + {"grayNil", vgradGray(), nil, Over, color.RGBA{136, 136, 136, 255}}, + {"grayNilSrc", vgradGray(), nil, Src, color.RGBA{136, 136, 136, 255}}, + // Uniform mask (100%, 75%, nil) and variable CMYK source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 136, 0, 63} in CMYK-space, which is {192, 89, 192} in RGB-space. + {"cmyk", vgradMagenta(), fillAlpha(255), Over, color.RGBA{192, 89, 192, 255}}, + {"cmykSrc", vgradMagenta(), fillAlpha(255), Src, color.RGBA{192, 89, 192, 255}}, + {"cmykAlpha", vgradMagenta(), fillAlpha(192), Over, color.RGBA{178, 67, 145, 255}}, + {"cmykAlphaSrc", vgradMagenta(), fillAlpha(192), Src, color.RGBA{145, 67, 145, 192}}, + {"cmykNil", vgradMagenta(), nil, Over, color.RGBA{192, 89, 192, 255}}, + {"cmykNilSrc", vgradMagenta(), nil, Src, color.RGBA{192, 89, 192, 255}}, + // Variable mask and variable source. + // At (x, y) == (8, 8): + // The destination pixel is {136, 0, 0, 255}. + // The source pixel is {0, 0, 255, 255}. + // The mask pixel's alpha is 102, or 40%. + {"generic", fillBlue(255), vgradAlpha(192), Over, color.RGBA{81, 0, 102, 255}}, + {"genericSrc", fillBlue(255), vgradAlpha(192), Src, color.RGBA{0, 0, 102, 102}}, +} + +func makeGolden(dst image.Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op) image.Image { + // Since golden is a newly allocated image, we don't have to check if the + // input source and mask images and the output golden image overlap. + b := dst.Bounds() + sb := src.Bounds() + mb := image.Rect(-1e9, -1e9, 1e9, 1e9) + if mask != nil { + mb = mask.Bounds() + } + golden := image.NewRGBA(image.Rect(0, 0, b.Max.X, b.Max.Y)) + for y := r.Min.Y; y < r.Max.Y; y++ { + sy := y + sp.Y - r.Min.Y + my := y + mp.Y - r.Min.Y + for x := r.Min.X; x < r.Max.X; x++ { + if !(image.Pt(x, y).In(b)) { + continue + } + sx := x + sp.X - r.Min.X + if !(image.Pt(sx, sy).In(sb)) { + continue + } + mx := x + mp.X - r.Min.X + if !(image.Pt(mx, my).In(mb)) { + continue + } + + const M = 1<<16 - 1 + var dr, dg, db, da uint32 + if op == Over { + dr, dg, db, da = dst.At(x, y).RGBA() + } + sr, sg, sb, sa := src.At(sx, sy).RGBA() + ma := uint32(M) + if mask != nil { + _, _, _, ma = mask.At(mx, my).RGBA() + } + a := M - (sa * ma / M) + golden.Set(x, y, color.RGBA64{ + uint16((dr*a + sr*ma) / M), + uint16((dg*a + sg*ma) / M), + uint16((db*a + sb*ma) / M), + uint16((da*a + sa*ma) / M), + }) + } + } + return golden.SubImage(b) +} + +func TestDraw(t *testing.T) { + rr := []image.Rectangle{ + image.Rect(0, 0, 0, 0), + image.Rect(0, 0, 16, 16), + image.Rect(3, 5, 12, 10), + image.Rect(0, 0, 9, 9), + image.Rect(8, 8, 16, 16), + image.Rect(8, 0, 9, 16), + image.Rect(0, 8, 16, 9), + image.Rect(8, 8, 9, 9), + image.Rect(8, 8, 8, 8), + } + for _, r := range rr { + loop: + for _, test := range drawTests { + dst := hgradRed(255).(*image.RGBA).SubImage(r).(Image) + // Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation. + golden := makeGolden(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op) + b := dst.Bounds() + if !b.Eq(golden.Bounds()) { + t.Errorf("draw %v %s: bounds %v versus %v", r, test.desc, dst.Bounds(), golden.Bounds()) + continue + } + // Draw the same combination onto the actual dst using the optimized DrawMask implementation. + DrawMask(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op) + if image.Pt(8, 8).In(r) { + // Check that the resultant pixel at (8, 8) matches what we expect + // (the expected value can be verified by hand). + if !eq(dst.At(8, 8), test.expected) { + t.Errorf("draw %v %s: at (8, 8) %v versus %v", r, test.desc, dst.At(8, 8), test.expected) + continue + } + } + // Check that the resultant dst image matches the golden output. + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !eq(dst.At(x, y), golden.At(x, y)) { + t.Errorf("draw %v %s: at (%d, %d), %v versus golden %v", r, test.desc, x, y, dst.At(x, y), golden.At(x, y)) + continue loop + } + } + } + } + } +} + +func TestDrawOverlap(t *testing.T) { + for _, op := range []Op{Over, Src} { + for yoff := -2; yoff <= 2; yoff++ { + loop: + for xoff := -2; xoff <= 2; xoff++ { + m := gradYellow(127).(*image.RGBA) + dst := m.SubImage(image.Rect(5, 5, 10, 10)).(*image.RGBA) + src := m.SubImage(image.Rect(5+xoff, 5+yoff, 10+xoff, 10+yoff)).(*image.RGBA) + b := dst.Bounds() + // Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation. + golden := makeGolden(dst, b, src, src.Bounds().Min, nil, image.ZP, op) + if !b.Eq(golden.Bounds()) { + t.Errorf("drawOverlap xoff=%d,yoff=%d: bounds %v versus %v", xoff, yoff, dst.Bounds(), golden.Bounds()) + continue + } + // Draw the same combination onto the actual dst using the optimized DrawMask implementation. + DrawMask(dst, b, src, src.Bounds().Min, nil, image.ZP, op) + // Check that the resultant dst image matches the golden output. + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !eq(dst.At(x, y), golden.At(x, y)) { + t.Errorf("drawOverlap xoff=%d,yoff=%d: at (%d, %d), %v versus golden %v", xoff, yoff, x, y, dst.At(x, y), golden.At(x, y)) + continue loop + } + } + } + } + } + } +} + +// TestNonZeroSrcPt checks drawing with a non-zero src point parameter. +func TestNonZeroSrcPt(t *testing.T) { + a := image.NewRGBA(image.Rect(0, 0, 1, 1)) + b := image.NewRGBA(image.Rect(0, 0, 2, 2)) + b.Set(0, 0, color.RGBA{0, 0, 0, 5}) + b.Set(1, 0, color.RGBA{0, 0, 5, 5}) + b.Set(0, 1, color.RGBA{0, 5, 0, 5}) + b.Set(1, 1, color.RGBA{5, 0, 0, 5}) + Draw(a, image.Rect(0, 0, 1, 1), b, image.Pt(1, 1), Over) + if !eq(color.RGBA{5, 0, 0, 5}, a.At(0, 0)) { + t.Errorf("non-zero src pt: want %v got %v", color.RGBA{5, 0, 0, 5}, a.At(0, 0)) + } +} + +func TestFill(t *testing.T) { + rr := []image.Rectangle{ + image.Rect(0, 0, 0, 0), + image.Rect(0, 0, 40, 30), + image.Rect(10, 0, 40, 30), + image.Rect(0, 20, 40, 30), + image.Rect(10, 20, 40, 30), + image.Rect(10, 20, 15, 25), + image.Rect(10, 0, 35, 30), + image.Rect(0, 15, 40, 16), + image.Rect(24, 24, 25, 25), + image.Rect(23, 23, 26, 26), + image.Rect(22, 22, 27, 27), + image.Rect(21, 21, 28, 28), + image.Rect(20, 20, 29, 29), + } + for _, r := range rr { + m := image.NewRGBA(image.Rect(0, 0, 40, 30)).SubImage(r).(*image.RGBA) + b := m.Bounds() + c := color.RGBA{11, 0, 0, 255} + src := &image.Uniform{C: c} + check := func(desc string) { + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !eq(c, m.At(x, y)) { + t.Errorf("%s fill: at (%d, %d), sub-image bounds=%v: want %v got %v", desc, x, y, r, c, m.At(x, y)) + return + } + } + } + } + // Draw 1 pixel at a time. + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + DrawMask(m, image.Rect(x, y, x+1, y+1), src, image.ZP, nil, image.ZP, Src) + } + } + check("pixel") + // Draw 1 row at a time. + c = color.RGBA{0, 22, 0, 255} + src = &image.Uniform{C: c} + for y := b.Min.Y; y < b.Max.Y; y++ { + DrawMask(m, image.Rect(b.Min.X, y, b.Max.X, y+1), src, image.ZP, nil, image.ZP, Src) + } + check("row") + // Draw 1 column at a time. + c = color.RGBA{0, 0, 33, 255} + src = &image.Uniform{C: c} + for x := b.Min.X; x < b.Max.X; x++ { + DrawMask(m, image.Rect(x, b.Min.Y, x+1, b.Max.Y), src, image.ZP, nil, image.ZP, Src) + } + check("column") + // Draw the whole image at once. + c = color.RGBA{44, 55, 66, 77} + src = &image.Uniform{C: c} + DrawMask(m, b, src, image.ZP, nil, image.ZP, Src) + check("whole") + } +} + +// TestFloydSteinbergCheckerboard tests that the result of Floyd-Steinberg +// error diffusion of a uniform 50% gray source image with a black-and-white +// palette is a checkerboard pattern. +func TestFloydSteinbergCheckerboard(t *testing.T) { + b := image.Rect(0, 0, 640, 480) + // We can't represent 50% exactly, but 0x7fff / 0xffff is close enough. + src := &image.Uniform{color.Gray16{0x7fff}} + dst := image.NewPaletted(b, color.Palette{color.Black, color.White}) + FloydSteinberg.Draw(dst, b, src, image.Point{}) + nErr := 0 + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + got := dst.Pix[dst.PixOffset(x, y)] + want := uint8(x+y) % 2 + if got != want { + t.Errorf("at (%d, %d): got %d, want %d", x, y, got, want) + if nErr++; nErr == 10 { + t.Fatal("there may be more errors") + } + } + } + } +} + +// embeddedPaletted is an Image that behaves like an *image.Paletted but whose +// type is not *image.Paletted. +type embeddedPaletted struct { + *image.Paletted +} + +// TestPaletted tests that the drawPaletted function behaves the same +// regardless of whether dst is an *image.Paletted. +func TestPaletted(t *testing.T) { + f, err := os.Open("../testdata/video-001.png") + if err != nil { + t.Fatalf("open: %v", err) + } + defer f.Close() + video001, err := png.Decode(f) + if err != nil { + t.Fatalf("decode: %v", err) + } + b := video001.Bounds() + + cgaPalette := color.Palette{ + color.RGBA{0x00, 0x00, 0x00, 0xff}, + color.RGBA{0x55, 0xff, 0xff, 0xff}, + color.RGBA{0xff, 0x55, 0xff, 0xff}, + color.RGBA{0xff, 0xff, 0xff, 0xff}, + } + drawers := map[string]Drawer{ + "src": Src, + "floyd-steinberg": FloydSteinberg, + } + sources := map[string]image.Image{ + "uniform": &image.Uniform{color.RGBA{0xff, 0x7f, 0xff, 0xff}}, + "video001": video001, + } + + for dName, d := range drawers { + loop: + for sName, src := range sources { + dst0 := image.NewPaletted(b, cgaPalette) + dst1 := image.NewPaletted(b, cgaPalette) + d.Draw(dst0, b, src, image.Point{}) + d.Draw(embeddedPaletted{dst1}, b, src, image.Point{}) + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !eq(dst0.At(x, y), dst1.At(x, y)) { + t.Errorf("%s / %s: at (%d, %d), %v versus %v", + dName, sName, x, y, dst0.At(x, y), dst1.At(x, y)) + continue loop + } + } + } + } + } +} + +func TestSqDiff(t *testing.T) { + // This test is similar to the one from the image/color package, but + // sqDiff in this package accepts int32 instead of uint32, so test it + // for appropriate input. + + // canonical sqDiff implementation + orig := func(x, y int32) uint32 { + var d uint32 + if x > y { + d = uint32(x - y) + } else { + d = uint32(y - x) + } + return (d * d) >> 2 + } + testCases := []int32{ + 0, + 1, + 2, + 0x0fffd, + 0x0fffe, + 0x0ffff, + 0x10000, + 0x10001, + 0x10002, + 0x7ffffffd, + 0x7ffffffe, + 0x7fffffff, + -0x7ffffffd, + -0x7ffffffe, + -0x80000000, + } + for _, x := range testCases { + for _, y := range testCases { + if got, want := sqDiff(x, y), orig(x, y); got != want { + t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want) + } + } + } + if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil { + t.Fatal(err) + } +} diff --git a/src/image/draw/example_test.go b/src/image/draw/example_test.go new file mode 100644 index 0000000..2ccc2f4 --- /dev/null +++ b/src/image/draw/example_test.go @@ -0,0 +1,48 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package draw_test + +import ( + "fmt" + "image" + "image/color" + "image/draw" + "math" +) + +func ExampleDrawer_floydSteinberg() { + const width = 130 + const height = 50 + + im := image.NewGray(image.Rectangle{Max: image.Point{X: width, Y: height}}) + for x := 0; x < width; x++ { + for y := 0; y < height; y++ { + dist := math.Sqrt(math.Pow(float64(x-width/2), 2)/3+math.Pow(float64(y-height/2), 2)) / (height / 1.5) * 255 + var gray uint8 + if dist > 255 { + gray = 255 + } else { + gray = uint8(dist) + } + im.SetGray(x, y, color.Gray{Y: 255 - gray}) + } + } + pi := image.NewPaletted(im.Bounds(), []color.Color{ + color.Gray{Y: 255}, + color.Gray{Y: 160}, + color.Gray{Y: 70}, + color.Gray{Y: 35}, + color.Gray{Y: 0}, + }) + + draw.FloydSteinberg.Draw(pi, im.Bounds(), im, image.ZP) + shade := []string{" ", "░", "▒", "▓", "█"} + for i, p := range pi.Pix { + fmt.Print(shade[p]) + if (i+1)%width == 0 { + fmt.Print("\n") + } + } +} diff --git a/src/image/format.go b/src/image/format.go new file mode 100644 index 0000000..a53b8f9 --- /dev/null +++ b/src/image/format.go @@ -0,0 +1,109 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "bufio" + "errors" + "io" + "sync" + "sync/atomic" +) + +// ErrFormat indicates that decoding encountered an unknown format. +var ErrFormat = errors.New("image: unknown format") + +// A format holds an image format's name, magic header and how to decode it. +type format struct { + name, magic string + decode func(io.Reader) (Image, error) + decodeConfig func(io.Reader) (Config, error) +} + +// Formats is the list of registered formats. +var ( + formatsMu sync.Mutex + atomicFormats atomic.Value +) + +// RegisterFormat registers an image format for use by Decode. +// Name is the name of the format, like "jpeg" or "png". +// Magic is the magic prefix that identifies the format's encoding. The magic +// string can contain "?" wildcards that each match any one byte. +// Decode is the function that decodes the encoded image. +// DecodeConfig is the function that decodes just its configuration. +func RegisterFormat(name, magic string, decode func(io.Reader) (Image, error), decodeConfig func(io.Reader) (Config, error)) { + formatsMu.Lock() + formats, _ := atomicFormats.Load().([]format) + atomicFormats.Store(append(formats, format{name, magic, decode, decodeConfig})) + formatsMu.Unlock() +} + +// A reader is an io.Reader that can also peek ahead. +type reader interface { + io.Reader + Peek(int) ([]byte, error) +} + +// asReader converts an io.Reader to a reader. +func asReader(r io.Reader) reader { + if rr, ok := r.(reader); ok { + return rr + } + return bufio.NewReader(r) +} + +// Match reports whether magic matches b. Magic may contain "?" wildcards. +func match(magic string, b []byte) bool { + if len(magic) != len(b) { + return false + } + for i, c := range b { + if magic[i] != c && magic[i] != '?' { + return false + } + } + return true +} + +// Sniff determines the format of r's data. +func sniff(r reader) format { + formats, _ := atomicFormats.Load().([]format) + for _, f := range formats { + b, err := r.Peek(len(f.magic)) + if err == nil && match(f.magic, b) { + return f + } + } + return format{} +} + +// Decode decodes an image that has been encoded in a registered format. +// The string returned is the format name used during format registration. +// Format registration is typically done by an init function in the codec- +// specific package. +func Decode(r io.Reader) (Image, string, error) { + rr := asReader(r) + f := sniff(rr) + if f.decode == nil { + return nil, "", ErrFormat + } + m, err := f.decode(rr) + return m, f.name, err +} + +// DecodeConfig decodes the color model and dimensions of an image that has +// been encoded in a registered format. The string returned is the format name +// used during format registration. Format registration is typically done by +// an init function in the codec-specific package. +func DecodeConfig(r io.Reader) (Config, string, error) { + rr := asReader(r) + f := sniff(rr) + if f.decodeConfig == nil { + return Config{}, "", ErrFormat + } + c, err := f.decodeConfig(rr) + return c, f.name, err +} diff --git a/src/image/geom.go b/src/image/geom.go new file mode 100644 index 0000000..e71aa61 --- /dev/null +++ b/src/image/geom.go @@ -0,0 +1,317 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "image/color" + "math/bits" + "strconv" +) + +// A Point is an X, Y coordinate pair. The axes increase right and down. +type Point struct { + X, Y int +} + +// String returns a string representation of p like "(3,4)". +func (p Point) String() string { + return "(" + strconv.Itoa(p.X) + "," + strconv.Itoa(p.Y) + ")" +} + +// Add returns the vector p+q. +func (p Point) Add(q Point) Point { + return Point{p.X + q.X, p.Y + q.Y} +} + +// Sub returns the vector p-q. +func (p Point) Sub(q Point) Point { + return Point{p.X - q.X, p.Y - q.Y} +} + +// Mul returns the vector p*k. +func (p Point) Mul(k int) Point { + return Point{p.X * k, p.Y * k} +} + +// Div returns the vector p/k. +func (p Point) Div(k int) Point { + return Point{p.X / k, p.Y / k} +} + +// In reports whether p is in r. +func (p Point) In(r Rectangle) bool { + return r.Min.X <= p.X && p.X < r.Max.X && + r.Min.Y <= p.Y && p.Y < r.Max.Y +} + +// Mod returns the point q in r such that p.X-q.X is a multiple of r's width +// and p.Y-q.Y is a multiple of r's height. +func (p Point) Mod(r Rectangle) Point { + w, h := r.Dx(), r.Dy() + p = p.Sub(r.Min) + p.X = p.X % w + if p.X < 0 { + p.X += w + } + p.Y = p.Y % h + if p.Y < 0 { + p.Y += h + } + return p.Add(r.Min) +} + +// Eq reports whether p and q are equal. +func (p Point) Eq(q Point) bool { + return p == q +} + +// ZP is the zero Point. +// +// Deprecated: Use a literal image.Point{} instead. +var ZP Point + +// Pt is shorthand for Point{X, Y}. +func Pt(X, Y int) Point { + return Point{X, Y} +} + +// A Rectangle contains the points with Min.X <= X < Max.X, Min.Y <= Y < Max.Y. +// It is well-formed if Min.X <= Max.X and likewise for Y. Points are always +// well-formed. A rectangle's methods always return well-formed outputs for +// well-formed inputs. +// +// A Rectangle is also an Image whose bounds are the rectangle itself. At +// returns color.Opaque for points in the rectangle and color.Transparent +// otherwise. +type Rectangle struct { + Min, Max Point +} + +// String returns a string representation of r like "(3,4)-(6,5)". +func (r Rectangle) String() string { + return r.Min.String() + "-" + r.Max.String() +} + +// Dx returns r's width. +func (r Rectangle) Dx() int { + return r.Max.X - r.Min.X +} + +// Dy returns r's height. +func (r Rectangle) Dy() int { + return r.Max.Y - r.Min.Y +} + +// Size returns r's width and height. +func (r Rectangle) Size() Point { + return Point{ + r.Max.X - r.Min.X, + r.Max.Y - r.Min.Y, + } +} + +// Add returns the rectangle r translated by p. +func (r Rectangle) Add(p Point) Rectangle { + return Rectangle{ + Point{r.Min.X + p.X, r.Min.Y + p.Y}, + Point{r.Max.X + p.X, r.Max.Y + p.Y}, + } +} + +// Sub returns the rectangle r translated by -p. +func (r Rectangle) Sub(p Point) Rectangle { + return Rectangle{ + Point{r.Min.X - p.X, r.Min.Y - p.Y}, + Point{r.Max.X - p.X, r.Max.Y - p.Y}, + } +} + +// Inset returns the rectangle r inset by n, which may be negative. If either +// of r's dimensions is less than 2*n then an empty rectangle near the center +// of r will be returned. +func (r Rectangle) Inset(n int) Rectangle { + if r.Dx() < 2*n { + r.Min.X = (r.Min.X + r.Max.X) / 2 + r.Max.X = r.Min.X + } else { + r.Min.X += n + r.Max.X -= n + } + if r.Dy() < 2*n { + r.Min.Y = (r.Min.Y + r.Max.Y) / 2 + r.Max.Y = r.Min.Y + } else { + r.Min.Y += n + r.Max.Y -= n + } + return r +} + +// Intersect returns the largest rectangle contained by both r and s. If the +// two rectangles do not overlap then the zero rectangle will be returned. +func (r Rectangle) Intersect(s Rectangle) Rectangle { + if r.Min.X < s.Min.X { + r.Min.X = s.Min.X + } + if r.Min.Y < s.Min.Y { + r.Min.Y = s.Min.Y + } + if r.Max.X > s.Max.X { + r.Max.X = s.Max.X + } + if r.Max.Y > s.Max.Y { + r.Max.Y = s.Max.Y + } + // Letting r0 and s0 be the values of r and s at the time that the method + // is called, this next line is equivalent to: + // + // if max(r0.Min.X, s0.Min.X) >= min(r0.Max.X, s0.Max.X) || likewiseForY { etc } + if r.Empty() { + return ZR + } + return r +} + +// Union returns the smallest rectangle that contains both r and s. +func (r Rectangle) Union(s Rectangle) Rectangle { + if r.Empty() { + return s + } + if s.Empty() { + return r + } + if r.Min.X > s.Min.X { + r.Min.X = s.Min.X + } + if r.Min.Y > s.Min.Y { + r.Min.Y = s.Min.Y + } + if r.Max.X < s.Max.X { + r.Max.X = s.Max.X + } + if r.Max.Y < s.Max.Y { + r.Max.Y = s.Max.Y + } + return r +} + +// Empty reports whether the rectangle contains no points. +func (r Rectangle) Empty() bool { + return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y +} + +// Eq reports whether r and s contain the same set of points. All empty +// rectangles are considered equal. +func (r Rectangle) Eq(s Rectangle) bool { + return r == s || r.Empty() && s.Empty() +} + +// Overlaps reports whether r and s have a non-empty intersection. +func (r Rectangle) Overlaps(s Rectangle) bool { + return !r.Empty() && !s.Empty() && + r.Min.X < s.Max.X && s.Min.X < r.Max.X && + r.Min.Y < s.Max.Y && s.Min.Y < r.Max.Y +} + +// In reports whether every point in r is in s. +func (r Rectangle) In(s Rectangle) bool { + if r.Empty() { + return true + } + // Note that r.Max is an exclusive bound for r, so that r.In(s) + // does not require that r.Max.In(s). + return s.Min.X <= r.Min.X && r.Max.X <= s.Max.X && + s.Min.Y <= r.Min.Y && r.Max.Y <= s.Max.Y +} + +// Canon returns the canonical version of r. The returned rectangle has minimum +// and maximum coordinates swapped if necessary so that it is well-formed. +func (r Rectangle) Canon() Rectangle { + if r.Max.X < r.Min.X { + r.Min.X, r.Max.X = r.Max.X, r.Min.X + } + if r.Max.Y < r.Min.Y { + r.Min.Y, r.Max.Y = r.Max.Y, r.Min.Y + } + return r +} + +// At implements the Image interface. +func (r Rectangle) At(x, y int) color.Color { + if (Point{x, y}).In(r) { + return color.Opaque + } + return color.Transparent +} + +// RGBA64At implements the RGBA64Image interface. +func (r Rectangle) RGBA64At(x, y int) color.RGBA64 { + if (Point{x, y}).In(r) { + return color.RGBA64{0xffff, 0xffff, 0xffff, 0xffff} + } + return color.RGBA64{} +} + +// Bounds implements the Image interface. +func (r Rectangle) Bounds() Rectangle { + return r +} + +// ColorModel implements the Image interface. +func (r Rectangle) ColorModel() color.Model { + return color.Alpha16Model +} + +// ZR is the zero Rectangle. +// +// Deprecated: Use a literal image.Rectangle{} instead. +var ZR Rectangle + +// Rect is shorthand for Rectangle{Pt(x0, y0), Pt(x1, y1)}. The returned +// rectangle has minimum and maximum coordinates swapped if necessary so that +// it is well-formed. +func Rect(x0, y0, x1, y1 int) Rectangle { + if x0 > x1 { + x0, x1 = x1, x0 + } + if y0 > y1 { + y0, y1 = y1, y0 + } + return Rectangle{Point{x0, y0}, Point{x1, y1}} +} + +// mul3NonNeg returns (x * y * z), unless at least one argument is negative or +// if the computation overflows the int type, in which case it returns -1. +func mul3NonNeg(x int, y int, z int) int { + if (x < 0) || (y < 0) || (z < 0) { + return -1 + } + hi, lo := bits.Mul64(uint64(x), uint64(y)) + if hi != 0 { + return -1 + } + hi, lo = bits.Mul64(lo, uint64(z)) + if hi != 0 { + return -1 + } + a := int(lo) + if (a < 0) || (uint64(a) != lo) { + return -1 + } + return a +} + +// add2NonNeg returns (x + y), unless at least one argument is negative or if +// the computation overflows the int type, in which case it returns -1. +func add2NonNeg(x int, y int) int { + if (x < 0) || (y < 0) { + return -1 + } + a := x + y + if a < 0 { + return -1 + } + return a +} diff --git a/src/image/geom_test.go b/src/image/geom_test.go new file mode 100644 index 0000000..9fede02 --- /dev/null +++ b/src/image/geom_test.go @@ -0,0 +1,116 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "fmt" + "testing" +) + +func TestRectangle(t *testing.T) { + // in checks that every point in f is in g. + in := func(f, g Rectangle) error { + if !f.In(g) { + return fmt.Errorf("f=%s, f.In(%s): got false, want true", f, g) + } + for y := f.Min.Y; y < f.Max.Y; y++ { + for x := f.Min.X; x < f.Max.X; x++ { + p := Point{x, y} + if !p.In(g) { + return fmt.Errorf("p=%s, p.In(%s): got false, want true", p, g) + } + } + } + return nil + } + + rects := []Rectangle{ + Rect(0, 0, 10, 10), + Rect(10, 0, 20, 10), + Rect(1, 2, 3, 4), + Rect(4, 6, 10, 10), + Rect(2, 3, 12, 5), + Rect(-1, -2, 0, 0), + Rect(-1, -2, 4, 6), + Rect(-10, -20, 30, 40), + Rect(8, 8, 8, 8), + Rect(88, 88, 88, 88), + Rect(6, 5, 4, 3), + } + + // r.Eq(s) should be equivalent to every point in r being in s, and every + // point in s being in r. + for _, r := range rects { + for _, s := range rects { + got := r.Eq(s) + want := in(r, s) == nil && in(s, r) == nil + if got != want { + t.Errorf("Eq: r=%s, s=%s: got %t, want %t", r, s, got, want) + } + } + } + + // The intersection should be the largest rectangle a such that every point + // in a is both in r and in s. + for _, r := range rects { + for _, s := range rects { + a := r.Intersect(s) + if err := in(a, r); err != nil { + t.Errorf("Intersect: r=%s, s=%s, a=%s, a not in r: %v", r, s, a, err) + } + if err := in(a, s); err != nil { + t.Errorf("Intersect: r=%s, s=%s, a=%s, a not in s: %v", r, s, a, err) + } + if isZero, overlaps := a == (Rectangle{}), r.Overlaps(s); isZero == overlaps { + t.Errorf("Intersect: r=%s, s=%s, a=%s: isZero=%t same as overlaps=%t", + r, s, a, isZero, overlaps) + } + largerThanA := [4]Rectangle{a, a, a, a} + largerThanA[0].Min.X-- + largerThanA[1].Min.Y-- + largerThanA[2].Max.X++ + largerThanA[3].Max.Y++ + for i, b := range largerThanA { + if b.Empty() { + // b isn't actually larger than a. + continue + } + if in(b, r) == nil && in(b, s) == nil { + t.Errorf("Intersect: r=%s, s=%s, a=%s, b=%s, i=%d: intersection could be larger", + r, s, a, b, i) + } + } + } + } + + // The union should be the smallest rectangle a such that every point in r + // is in a and every point in s is in a. + for _, r := range rects { + for _, s := range rects { + a := r.Union(s) + if err := in(r, a); err != nil { + t.Errorf("Union: r=%s, s=%s, a=%s, r not in a: %v", r, s, a, err) + } + if err := in(s, a); err != nil { + t.Errorf("Union: r=%s, s=%s, a=%s, s not in a: %v", r, s, a, err) + } + if a.Empty() { + // You can't get any smaller than a. + continue + } + smallerThanA := [4]Rectangle{a, a, a, a} + smallerThanA[0].Min.X++ + smallerThanA[1].Min.Y++ + smallerThanA[2].Max.X-- + smallerThanA[3].Max.Y-- + for i, b := range smallerThanA { + if in(r, b) == nil && in(s, b) == nil { + t.Errorf("Union: r=%s, s=%s, a=%s, b=%s, i=%d: union could be smaller", + r, s, a, b, i) + } + } + } + } +} diff --git a/src/image/gif/reader.go b/src/image/gif/reader.go new file mode 100644 index 0000000..9e8268c --- /dev/null +++ b/src/image/gif/reader.go @@ -0,0 +1,637 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package gif implements a GIF image decoder and encoder. +// +// The GIF specification is at https://www.w3.org/Graphics/GIF/spec-gif89a.txt. +package gif + +import ( + "bufio" + "compress/lzw" + "errors" + "fmt" + "image" + "image/color" + "io" +) + +var ( + errNotEnough = errors.New("gif: not enough image data") + errTooMuch = errors.New("gif: too much image data") + errBadPixel = errors.New("gif: invalid pixel value") +) + +// If the io.Reader does not also have ReadByte, then decode will introduce its own buffering. +type reader interface { + io.Reader + io.ByteReader +} + +// Masks etc. +const ( + // Fields. + fColorTable = 1 << 7 + fInterlace = 1 << 6 + fColorTableBitsMask = 7 + + // Graphic control flags. + gcTransparentColorSet = 1 << 0 + gcDisposalMethodMask = 7 << 2 +) + +// Disposal Methods. +const ( + DisposalNone = 0x01 + DisposalBackground = 0x02 + DisposalPrevious = 0x03 +) + +// Section indicators. +const ( + sExtension = 0x21 + sImageDescriptor = 0x2C + sTrailer = 0x3B +) + +// Extensions. +const ( + eText = 0x01 // Plain Text + eGraphicControl = 0xF9 // Graphic Control + eComment = 0xFE // Comment + eApplication = 0xFF // Application +) + +func readFull(r io.Reader, b []byte) error { + _, err := io.ReadFull(r, b) + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return err +} + +func readByte(r io.ByteReader) (byte, error) { + b, err := r.ReadByte() + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return b, err +} + +// decoder is the type used to decode a GIF file. +type decoder struct { + r reader + + // From header. + vers string + width int + height int + loopCount int + delayTime int + backgroundIndex byte + disposalMethod byte + + // From image descriptor. + imageFields byte + + // From graphics control. + transparentIndex byte + hasTransparentIndex bool + + // Computed. + globalColorTable color.Palette + + // Used when decoding. + delay []int + disposal []byte + image []*image.Paletted + tmp [1024]byte // must be at least 768 so we can read color table +} + +// blockReader parses the block structure of GIF image data, which comprises +// (n, (n bytes)) blocks, with 1 <= n <= 255. It is the reader given to the +// LZW decoder, which is thus immune to the blocking. After the LZW decoder +// completes, there will be a 0-byte block remaining (0, ()), which is +// consumed when checking that the blockReader is exhausted. +// +// To avoid the allocation of a bufio.Reader for the lzw Reader, blockReader +// implements io.ByteReader and buffers blocks into the decoder's "tmp" buffer. +type blockReader struct { + d *decoder + i, j uint8 // d.tmp[i:j] contains the buffered bytes + err error +} + +func (b *blockReader) fill() { + if b.err != nil { + return + } + b.j, b.err = readByte(b.d.r) + if b.j == 0 && b.err == nil { + b.err = io.EOF + } + if b.err != nil { + return + } + + b.i = 0 + b.err = readFull(b.d.r, b.d.tmp[:b.j]) + if b.err != nil { + b.j = 0 + } +} + +func (b *blockReader) ReadByte() (byte, error) { + if b.i == b.j { + b.fill() + if b.err != nil { + return 0, b.err + } + } + + c := b.d.tmp[b.i] + b.i++ + return c, nil +} + +// blockReader must implement io.Reader, but its Read shouldn't ever actually +// be called in practice. The compress/lzw package will only call ReadByte. +func (b *blockReader) Read(p []byte) (int, error) { + if len(p) == 0 || b.err != nil { + return 0, b.err + } + if b.i == b.j { + b.fill() + if b.err != nil { + return 0, b.err + } + } + + n := copy(p, b.d.tmp[b.i:b.j]) + b.i += uint8(n) + return n, nil +} + +// close primarily detects whether or not a block terminator was encountered +// after reading a sequence of data sub-blocks. It allows at most one trailing +// sub-block worth of data. I.e., if some number of bytes exist in one sub-block +// following the end of LZW data, the very next sub-block must be the block +// terminator. If the very end of LZW data happened to fill one sub-block, at +// most one more sub-block of length 1 may exist before the block-terminator. +// These accommodations allow us to support GIFs created by less strict encoders. +// See https://golang.org/issue/16146. +func (b *blockReader) close() error { + if b.err == io.EOF { + // A clean block-sequence terminator was encountered while reading. + return nil + } else if b.err != nil { + // Some other error was encountered while reading. + return b.err + } + + if b.i == b.j { + // We reached the end of a sub block reading LZW data. We'll allow at + // most one more sub block of data with a length of 1 byte. + b.fill() + if b.err == io.EOF { + return nil + } else if b.err != nil { + return b.err + } else if b.j > 1 { + return errTooMuch + } + } + + // Part of a sub-block remains buffered. We expect that the next attempt to + // buffer a sub-block will reach the block terminator. + b.fill() + if b.err == io.EOF { + return nil + } else if b.err != nil { + return b.err + } + + return errTooMuch +} + +// decode reads a GIF image from r and stores the result in d. +func (d *decoder) decode(r io.Reader, configOnly, keepAllFrames bool) error { + // Add buffering if r does not provide ReadByte. + if rr, ok := r.(reader); ok { + d.r = rr + } else { + d.r = bufio.NewReader(r) + } + + d.loopCount = -1 + + err := d.readHeaderAndScreenDescriptor() + if err != nil { + return err + } + if configOnly { + return nil + } + + for { + c, err := readByte(d.r) + if err != nil { + return fmt.Errorf("gif: reading frames: %v", err) + } + switch c { + case sExtension: + if err = d.readExtension(); err != nil { + return err + } + + case sImageDescriptor: + if err = d.readImageDescriptor(keepAllFrames); err != nil { + return err + } + + case sTrailer: + if len(d.image) == 0 { + return fmt.Errorf("gif: missing image data") + } + return nil + + default: + return fmt.Errorf("gif: unknown block type: 0x%.2x", c) + } + } +} + +func (d *decoder) readHeaderAndScreenDescriptor() error { + err := readFull(d.r, d.tmp[:13]) + if err != nil { + return fmt.Errorf("gif: reading header: %v", err) + } + d.vers = string(d.tmp[:6]) + if d.vers != "GIF87a" && d.vers != "GIF89a" { + return fmt.Errorf("gif: can't recognize format %q", d.vers) + } + d.width = int(d.tmp[6]) + int(d.tmp[7])<<8 + d.height = int(d.tmp[8]) + int(d.tmp[9])<<8 + if fields := d.tmp[10]; fields&fColorTable != 0 { + d.backgroundIndex = d.tmp[11] + // readColorTable overwrites the contents of d.tmp, but that's OK. + if d.globalColorTable, err = d.readColorTable(fields); err != nil { + return err + } + } + // d.tmp[12] is the Pixel Aspect Ratio, which is ignored. + return nil +} + +func (d *decoder) readColorTable(fields byte) (color.Palette, error) { + n := 1 << (1 + uint(fields&fColorTableBitsMask)) + err := readFull(d.r, d.tmp[:3*n]) + if err != nil { + return nil, fmt.Errorf("gif: reading color table: %s", err) + } + j, p := 0, make(color.Palette, n) + for i := range p { + p[i] = color.RGBA{d.tmp[j+0], d.tmp[j+1], d.tmp[j+2], 0xFF} + j += 3 + } + return p, nil +} + +func (d *decoder) readExtension() error { + extension, err := readByte(d.r) + if err != nil { + return fmt.Errorf("gif: reading extension: %v", err) + } + size := 0 + switch extension { + case eText: + size = 13 + case eGraphicControl: + return d.readGraphicControl() + case eComment: + // nothing to do but read the data. + case eApplication: + b, err := readByte(d.r) + if err != nil { + return fmt.Errorf("gif: reading extension: %v", err) + } + // The spec requires size be 11, but Adobe sometimes uses 10. + size = int(b) + default: + return fmt.Errorf("gif: unknown extension 0x%.2x", extension) + } + if size > 0 { + if err := readFull(d.r, d.tmp[:size]); err != nil { + return fmt.Errorf("gif: reading extension: %v", err) + } + } + + // Application Extension with "NETSCAPE2.0" as string and 1 in data means + // this extension defines a loop count. + if extension == eApplication && string(d.tmp[:size]) == "NETSCAPE2.0" { + n, err := d.readBlock() + if err != nil { + return fmt.Errorf("gif: reading extension: %v", err) + } + if n == 0 { + return nil + } + if n == 3 && d.tmp[0] == 1 { + d.loopCount = int(d.tmp[1]) | int(d.tmp[2])<<8 + } + } + for { + n, err := d.readBlock() + if err != nil { + return fmt.Errorf("gif: reading extension: %v", err) + } + if n == 0 { + return nil + } + } +} + +func (d *decoder) readGraphicControl() error { + if err := readFull(d.r, d.tmp[:6]); err != nil { + return fmt.Errorf("gif: can't read graphic control: %s", err) + } + if d.tmp[0] != 4 { + return fmt.Errorf("gif: invalid graphic control extension block size: %d", d.tmp[0]) + } + flags := d.tmp[1] + d.disposalMethod = (flags & gcDisposalMethodMask) >> 2 + d.delayTime = int(d.tmp[2]) | int(d.tmp[3])<<8 + if flags&gcTransparentColorSet != 0 { + d.transparentIndex = d.tmp[4] + d.hasTransparentIndex = true + } + if d.tmp[5] != 0 { + return fmt.Errorf("gif: invalid graphic control extension block terminator: %d", d.tmp[5]) + } + return nil +} + +func (d *decoder) readImageDescriptor(keepAllFrames bool) error { + m, err := d.newImageFromDescriptor() + if err != nil { + return err + } + useLocalColorTable := d.imageFields&fColorTable != 0 + if useLocalColorTable { + m.Palette, err = d.readColorTable(d.imageFields) + if err != nil { + return err + } + } else { + if d.globalColorTable == nil { + return errors.New("gif: no color table") + } + m.Palette = d.globalColorTable + } + if d.hasTransparentIndex { + if !useLocalColorTable { + // Clone the global color table. + m.Palette = append(color.Palette(nil), d.globalColorTable...) + } + if ti := int(d.transparentIndex); ti < len(m.Palette) { + m.Palette[ti] = color.RGBA{} + } else { + // The transparentIndex is out of range, which is an error + // according to the spec, but Firefox and Google Chrome + // seem OK with this, so we enlarge the palette with + // transparent colors. See golang.org/issue/15059. + p := make(color.Palette, ti+1) + copy(p, m.Palette) + for i := len(m.Palette); i < len(p); i++ { + p[i] = color.RGBA{} + } + m.Palette = p + } + } + litWidth, err := readByte(d.r) + if err != nil { + return fmt.Errorf("gif: reading image data: %v", err) + } + if litWidth < 2 || litWidth > 8 { + return fmt.Errorf("gif: pixel size in decode out of range: %d", litWidth) + } + // A wonderfully Go-like piece of magic. + br := &blockReader{d: d} + lzwr := lzw.NewReader(br, lzw.LSB, int(litWidth)) + defer lzwr.Close() + if err = readFull(lzwr, m.Pix); err != nil { + if err != io.ErrUnexpectedEOF { + return fmt.Errorf("gif: reading image data: %v", err) + } + return errNotEnough + } + // In theory, both lzwr and br should be exhausted. Reading from them + // should yield (0, io.EOF). + // + // The spec (Appendix F - Compression), says that "An End of + // Information code... must be the last code output by the encoder + // for an image". In practice, though, giflib (a widely used C + // library) does not enforce this, so we also accept lzwr returning + // io.ErrUnexpectedEOF (meaning that the encoded stream hit io.EOF + // before the LZW decoder saw an explicit end code), provided that + // the io.ReadFull call above successfully read len(m.Pix) bytes. + // See https://golang.org/issue/9856 for an example GIF. + if n, err := lzwr.Read(d.tmp[256:257]); n != 0 || (err != io.EOF && err != io.ErrUnexpectedEOF) { + if err != nil { + return fmt.Errorf("gif: reading image data: %v", err) + } + return errTooMuch + } + + // In practice, some GIFs have an extra byte in the data sub-block + // stream, which we ignore. See https://golang.org/issue/16146. + if err := br.close(); err == errTooMuch { + return errTooMuch + } else if err != nil { + return fmt.Errorf("gif: reading image data: %v", err) + } + + // Check that the color indexes are inside the palette. + if len(m.Palette) < 256 { + for _, pixel := range m.Pix { + if int(pixel) >= len(m.Palette) { + return errBadPixel + } + } + } + + // Undo the interlacing if necessary. + if d.imageFields&fInterlace != 0 { + uninterlace(m) + } + + if keepAllFrames || len(d.image) == 0 { + d.image = append(d.image, m) + d.delay = append(d.delay, d.delayTime) + d.disposal = append(d.disposal, d.disposalMethod) + } + // The GIF89a spec, Section 23 (Graphic Control Extension) says: + // "The scope of this extension is the first graphic rendering block + // to follow." We therefore reset the GCE fields to zero. + d.delayTime = 0 + d.hasTransparentIndex = false + return nil +} + +func (d *decoder) newImageFromDescriptor() (*image.Paletted, error) { + if err := readFull(d.r, d.tmp[:9]); err != nil { + return nil, fmt.Errorf("gif: can't read image descriptor: %s", err) + } + left := int(d.tmp[0]) + int(d.tmp[1])<<8 + top := int(d.tmp[2]) + int(d.tmp[3])<<8 + width := int(d.tmp[4]) + int(d.tmp[5])<<8 + height := int(d.tmp[6]) + int(d.tmp[7])<<8 + d.imageFields = d.tmp[8] + + // The GIF89a spec, Section 20 (Image Descriptor) says: "Each image must + // fit within the boundaries of the Logical Screen, as defined in the + // Logical Screen Descriptor." + // + // This is conceptually similar to testing + // frameBounds := image.Rect(left, top, left+width, top+height) + // imageBounds := image.Rect(0, 0, d.width, d.height) + // if !frameBounds.In(imageBounds) { etc } + // but the semantics of the Go image.Rectangle type is that r.In(s) is true + // whenever r is an empty rectangle, even if r.Min.X > s.Max.X. Here, we + // want something stricter. + // + // Note that, by construction, left >= 0 && top >= 0, so we only have to + // explicitly compare frameBounds.Max (left+width, top+height) against + // imageBounds.Max (d.width, d.height) and not frameBounds.Min (left, top) + // against imageBounds.Min (0, 0). + if left+width > d.width || top+height > d.height { + return nil, errors.New("gif: frame bounds larger than image bounds") + } + return image.NewPaletted(image.Rectangle{ + Min: image.Point{left, top}, + Max: image.Point{left + width, top + height}, + }, nil), nil +} + +func (d *decoder) readBlock() (int, error) { + n, err := readByte(d.r) + if n == 0 || err != nil { + return 0, err + } + if err := readFull(d.r, d.tmp[:n]); err != nil { + return 0, err + } + return int(n), nil +} + +// interlaceScan defines the ordering for a pass of the interlace algorithm. +type interlaceScan struct { + skip, start int +} + +// interlacing represents the set of scans in an interlaced GIF image. +var interlacing = []interlaceScan{ + {8, 0}, // Group 1 : Every 8th. row, starting with row 0. + {8, 4}, // Group 2 : Every 8th. row, starting with row 4. + {4, 2}, // Group 3 : Every 4th. row, starting with row 2. + {2, 1}, // Group 4 : Every 2nd. row, starting with row 1. +} + +// uninterlace rearranges the pixels in m to account for interlaced input. +func uninterlace(m *image.Paletted) { + var nPix []uint8 + dx := m.Bounds().Dx() + dy := m.Bounds().Dy() + nPix = make([]uint8, dx*dy) + offset := 0 // steps through the input by sequential scan lines. + for _, pass := range interlacing { + nOffset := pass.start * dx // steps through the output as defined by pass. + for y := pass.start; y < dy; y += pass.skip { + copy(nPix[nOffset:nOffset+dx], m.Pix[offset:offset+dx]) + offset += dx + nOffset += dx * pass.skip + } + } + m.Pix = nPix +} + +// Decode reads a GIF image from r and returns the first embedded +// image as an image.Image. +func Decode(r io.Reader) (image.Image, error) { + var d decoder + if err := d.decode(r, false, false); err != nil { + return nil, err + } + return d.image[0], nil +} + +// GIF represents the possibly multiple images stored in a GIF file. +type GIF struct { + Image []*image.Paletted // The successive images. + Delay []int // The successive delay times, one per frame, in 100ths of a second. + // LoopCount controls the number of times an animation will be + // restarted during display. + // A LoopCount of 0 means to loop forever. + // A LoopCount of -1 means to show each frame only once. + // Otherwise, the animation is looped LoopCount+1 times. + LoopCount int + // Disposal is the successive disposal methods, one per frame. For + // backwards compatibility, a nil Disposal is valid to pass to EncodeAll, + // and implies that each frame's disposal method is 0 (no disposal + // specified). + Disposal []byte + // Config is the global color table (palette), width and height. A nil or + // empty-color.Palette Config.ColorModel means that each frame has its own + // color table and there is no global color table. Each frame's bounds must + // be within the rectangle defined by the two points (0, 0) and + // (Config.Width, Config.Height). + // + // For backwards compatibility, a zero-valued Config is valid to pass to + // EncodeAll, and implies that the overall GIF's width and height equals + // the first frame's bounds' Rectangle.Max point. + Config image.Config + // BackgroundIndex is the background index in the global color table, for + // use with the DisposalBackground disposal method. + BackgroundIndex byte +} + +// DecodeAll reads a GIF image from r and returns the sequential frames +// and timing information. +func DecodeAll(r io.Reader) (*GIF, error) { + var d decoder + if err := d.decode(r, false, true); err != nil { + return nil, err + } + gif := &GIF{ + Image: d.image, + LoopCount: d.loopCount, + Delay: d.delay, + Disposal: d.disposal, + Config: image.Config{ + ColorModel: d.globalColorTable, + Width: d.width, + Height: d.height, + }, + BackgroundIndex: d.backgroundIndex, + } + return gif, nil +} + +// DecodeConfig returns the global color model and dimensions of a GIF image +// without decoding the entire image. +func DecodeConfig(r io.Reader) (image.Config, error) { + var d decoder + if err := d.decode(r, true, false); err != nil { + return image.Config{}, err + } + return image.Config{ + ColorModel: d.globalColorTable, + Width: d.width, + Height: d.height, + }, nil +} + +func init() { + image.RegisterFormat("gif", "GIF8?a", Decode, DecodeConfig) +} diff --git a/src/image/gif/reader_test.go b/src/image/gif/reader_test.go new file mode 100644 index 0000000..5eec5ec --- /dev/null +++ b/src/image/gif/reader_test.go @@ -0,0 +1,441 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package gif + +import ( + "bytes" + "compress/lzw" + "image" + "image/color" + "image/color/palette" + "io" + "os" + "reflect" + "runtime" + "runtime/debug" + "strings" + "testing" +) + +// header, palette and trailer are parts of a valid 2x1 GIF image. +const ( + headerStr = "GIF89a" + + "\x02\x00\x01\x00" + // width=2, height=1 + "\x80\x00\x00" // headerFields=(a color table of 2 pixels), backgroundIndex, aspect + paletteStr = "\x10\x20\x30\x40\x50\x60" // the color table, also known as a palette + trailerStr = "\x3b" +) + +// lzw.NewReader wants a io.ByteReader, this ensures we're compatible. +var _ io.ByteReader = (*blockReader)(nil) + +// lzwEncode returns an LZW encoding (with 2-bit literals) of in. +func lzwEncode(in []byte) []byte { + b := &bytes.Buffer{} + w := lzw.NewWriter(b, lzw.LSB, 2) + if _, err := w.Write(in); err != nil { + panic(err) + } + if err := w.Close(); err != nil { + panic(err) + } + return b.Bytes() +} + +func TestDecode(t *testing.T) { + // extra contains superfluous bytes to inject into the GIF, either at the end + // of an existing data sub-block (past the LZW End of Information code) or in + // a separate data sub-block. The 0x02 values are arbitrary. + const extra = "\x02\x02\x02\x02" + + testCases := []struct { + nPix int // The number of pixels in the image data. + // If non-zero, write this many extra bytes inside the data sub-block + // containing the LZW end code. + extraExisting int + // If non-zero, write an extra block of this many bytes. + extraSeparate int + wantErr error + }{ + {0, 0, 0, errNotEnough}, + {1, 0, 0, errNotEnough}, + {2, 0, 0, nil}, + // An extra data sub-block after the compressed section with 1 byte which we + // silently skip. + {2, 0, 1, nil}, + // An extra data sub-block after the compressed section with 2 bytes. In + // this case we complain that there is too much data. + {2, 0, 2, errTooMuch}, + // Too much pixel data. + {3, 0, 0, errTooMuch}, + // An extra byte after LZW data, but inside the same data sub-block. + {2, 1, 0, nil}, + // Two extra bytes after LZW data, but inside the same data sub-block. + {2, 2, 0, nil}, + // Extra data exists in the final sub-block with LZW data, AND there is + // a bogus sub-block following. + {2, 1, 1, errTooMuch}, + } + for _, tc := range testCases { + b := &bytes.Buffer{} + b.WriteString(headerStr) + b.WriteString(paletteStr) + // Write an image with bounds 2x1 but tc.nPix pixels. If tc.nPix != 2 + // then this should result in an invalid GIF image. First, write a + // magic 0x2c (image descriptor) byte, bounds=(0,0)-(2,1), a flags + // byte, and 2-bit LZW literals. + b.WriteString("\x2c\x00\x00\x00\x00\x02\x00\x01\x00\x00\x02") + if tc.nPix > 0 { + enc := lzwEncode(make([]byte, tc.nPix)) + if len(enc)+tc.extraExisting > 0xff { + t.Errorf("nPix=%d, extraExisting=%d, extraSeparate=%d: compressed length %d is too large", + tc.nPix, tc.extraExisting, tc.extraSeparate, len(enc)) + continue + } + + // Write the size of the data sub-block containing the LZW data. + b.WriteByte(byte(len(enc) + tc.extraExisting)) + + // Write the LZW data. + b.Write(enc) + + // Write extra bytes inside the same data sub-block where LZW data + // ended. Each arbitrarily 0x02. + b.WriteString(extra[:tc.extraExisting]) + } + + if tc.extraSeparate > 0 { + // Data sub-block size. This indicates how many extra bytes follow. + b.WriteByte(byte(tc.extraSeparate)) + b.WriteString(extra[:tc.extraSeparate]) + } + b.WriteByte(0x00) // An empty block signifies the end of the image data. + b.WriteString(trailerStr) + + got, err := Decode(b) + if err != tc.wantErr { + t.Errorf("nPix=%d, extraExisting=%d, extraSeparate=%d\ngot %v\nwant %v", + tc.nPix, tc.extraExisting, tc.extraSeparate, err, tc.wantErr) + } + + if tc.wantErr != nil { + continue + } + want := &image.Paletted{ + Pix: []uint8{0, 0}, + Stride: 2, + Rect: image.Rect(0, 0, 2, 1), + Palette: color.Palette{ + color.RGBA{0x10, 0x20, 0x30, 0xff}, + color.RGBA{0x40, 0x50, 0x60, 0xff}, + }, + } + if !reflect.DeepEqual(got, want) { + t.Errorf("nPix=%d, extraExisting=%d, extraSeparate=%d\ngot %v\nwant %v", + tc.nPix, tc.extraExisting, tc.extraSeparate, got, want) + } + } +} + +func TestTransparentIndex(t *testing.T) { + b := &bytes.Buffer{} + b.WriteString(headerStr) + b.WriteString(paletteStr) + for transparentIndex := 0; transparentIndex < 3; transparentIndex++ { + if transparentIndex < 2 { + // Write the graphic control for the transparent index. + b.WriteString("\x21\xf9\x04\x01\x00\x00") + b.WriteByte(byte(transparentIndex)) + b.WriteByte(0) + } + // Write an image with bounds 2x1, as per TestDecode. + b.WriteString("\x2c\x00\x00\x00\x00\x02\x00\x01\x00\x00\x02") + enc := lzwEncode([]byte{0x00, 0x00}) + if len(enc) > 0xff { + t.Fatalf("compressed length %d is too large", len(enc)) + } + b.WriteByte(byte(len(enc))) + b.Write(enc) + b.WriteByte(0x00) + } + b.WriteString(trailerStr) + + g, err := DecodeAll(b) + if err != nil { + t.Fatalf("DecodeAll: %v", err) + } + c0 := color.RGBA{paletteStr[0], paletteStr[1], paletteStr[2], 0xff} + c1 := color.RGBA{paletteStr[3], paletteStr[4], paletteStr[5], 0xff} + cz := color.RGBA{} + wants := []color.Palette{ + {cz, c1}, + {c0, cz}, + {c0, c1}, + } + if len(g.Image) != len(wants) { + t.Fatalf("got %d images, want %d", len(g.Image), len(wants)) + } + for i, want := range wants { + got := g.Image[i].Palette + if !reflect.DeepEqual(got, want) { + t.Errorf("palette #%d:\ngot %v\nwant %v", i, got, want) + } + } +} + +// testGIF is a simple GIF that we can modify to test different scenarios. +var testGIF = []byte{ + 'G', 'I', 'F', '8', '9', 'a', + 1, 0, 1, 0, // w=1, h=1 (6) + 128, 0, 0, // headerFields, bg, aspect (10) + 0, 0, 0, 1, 1, 1, // color table and graphics control (13) + 0x21, 0xf9, 0x04, 0x00, 0x00, 0x00, 0xff, 0x00, // (19) + // frame 1 (0,0 - 1,1) + 0x2c, + 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x01, 0x00, // (32) + 0x00, + 0x02, 0x02, 0x4c, 0x01, 0x00, // lzw pixels + // trailer + 0x3b, +} + +func try(t *testing.T, b []byte, want string) { + _, err := DecodeAll(bytes.NewReader(b)) + var got string + if err != nil { + got = err.Error() + } + if got != want { + t.Fatalf("got %v, want %v", got, want) + } +} + +func TestBounds(t *testing.T) { + // Make a local copy of testGIF. + gif := make([]byte, len(testGIF)) + copy(gif, testGIF) + // Make the bounds too big, just by one. + gif[32] = 2 + want := "gif: frame bounds larger than image bounds" + try(t, gif, want) + + // Make the bounds too small; does not trigger bounds + // check, but now there's too much data. + gif[32] = 0 + want = "gif: too much image data" + try(t, gif, want) + gif[32] = 1 + + // Make the bounds really big, expect an error. + want = "gif: frame bounds larger than image bounds" + for i := 0; i < 4; i++ { + gif[32+i] = 0xff + } + try(t, gif, want) +} + +func TestNoPalette(t *testing.T) { + b := &bytes.Buffer{} + + // Manufacture a GIF with no palette, so any pixel at all + // will be invalid. + b.WriteString(headerStr[:len(headerStr)-3]) + b.WriteString("\x00\x00\x00") // No global palette. + + // Image descriptor: 2x1, no local palette, and 2-bit LZW literals. + b.WriteString("\x2c\x00\x00\x00\x00\x02\x00\x01\x00\x00\x02") + + // Encode the pixels: neither is in range, because there is no palette. + enc := lzwEncode([]byte{0x00, 0x03}) + b.WriteByte(byte(len(enc))) + b.Write(enc) + b.WriteByte(0x00) // An empty block signifies the end of the image data. + + b.WriteString(trailerStr) + + try(t, b.Bytes(), "gif: no color table") +} + +func TestPixelOutsidePaletteRange(t *testing.T) { + for _, pval := range []byte{0, 1, 2, 3} { + b := &bytes.Buffer{} + + // Manufacture a GIF with a 2 color palette. + b.WriteString(headerStr) + b.WriteString(paletteStr) + + // Image descriptor: 2x1, no local palette, and 2-bit LZW literals. + b.WriteString("\x2c\x00\x00\x00\x00\x02\x00\x01\x00\x00\x02") + + // Encode the pixels; some pvals trigger the expected error. + enc := lzwEncode([]byte{pval, pval}) + b.WriteByte(byte(len(enc))) + b.Write(enc) + b.WriteByte(0x00) // An empty block signifies the end of the image data. + + b.WriteString(trailerStr) + + // No error expected, unless the pixels are beyond the 2 color palette. + want := "" + if pval >= 2 { + want = "gif: invalid pixel value" + } + try(t, b.Bytes(), want) + } +} + +func TestTransparentPixelOutsidePaletteRange(t *testing.T) { + b := &bytes.Buffer{} + + // Manufacture a GIF with a 2 color palette. + b.WriteString(headerStr) + b.WriteString(paletteStr) + + // Graphic Control Extension: transparency, transparent color index = 3. + // + // This index, 3, is out of range of the global palette and there is no + // local palette in the subsequent image descriptor. This is an error + // according to the spec, but Firefox and Google Chrome seem OK with this. + // + // See golang.org/issue/15059. + b.WriteString("\x21\xf9\x04\x01\x00\x00\x03\x00") + + // Image descriptor: 2x1, no local palette, and 2-bit LZW literals. + b.WriteString("\x2c\x00\x00\x00\x00\x02\x00\x01\x00\x00\x02") + + // Encode the pixels. + enc := lzwEncode([]byte{0x03, 0x03}) + b.WriteByte(byte(len(enc))) + b.Write(enc) + b.WriteByte(0x00) // An empty block signifies the end of the image data. + + b.WriteString(trailerStr) + + try(t, b.Bytes(), "") +} + +func TestLoopCount(t *testing.T) { + testCases := []struct { + name string + data []byte + loopCount int + }{ + { + "loopcount-missing", + []byte("GIF89a000\x00000" + + ",0\x00\x00\x00\n\x00\n\x00\x80000000" + // image 0 descriptor & color table + "\x02\b\xf01u\xb9\xfdal\x05\x00;"), // image 0 image data & trailer + -1, + }, + { + "loopcount-0", + []byte("GIF89a000\x00000" + + "!\xff\vNETSCAPE2.0\x03\x01\x00\x00\x00" + // loop count = 0 + ",0\x00\x00\x00\n\x00\n\x00\x80000000" + // image 0 descriptor & color table + "\x02\b\xf01u\xb9\xfdal\x05\x00" + // image 0 image data + ",0\x00\x00\x00\n\x00\n\x00\x80000000" + // image 1 descriptor & color table + "\x02\b\xf01u\xb9\xfdal\x05\x00;"), // image 1 image data & trailer + 0, + }, + { + "loopcount-1", + []byte("GIF89a000\x00000" + + "!\xff\vNETSCAPE2.0\x03\x01\x01\x00\x00" + // loop count = 1 + ",0\x00\x00\x00\n\x00\n\x00\x80000000" + // image 0 descriptor & color table + "\x02\b\xf01u\xb9\xfdal\x05\x00" + // image 0 image data + ",0\x00\x00\x00\n\x00\n\x00\x80000000" + // image 1 descriptor & color table + "\x02\b\xf01u\xb9\xfdal\x05\x00;"), // image 1 image data & trailer + 1, + }, + } + + for _, tc := range testCases { + t.Run(tc.name, func(t *testing.T) { + img, err := DecodeAll(bytes.NewReader(tc.data)) + if err != nil { + t.Fatal("DecodeAll:", err) + } + w := new(bytes.Buffer) + err = EncodeAll(w, img) + if err != nil { + t.Fatal("EncodeAll:", err) + } + img1, err := DecodeAll(w) + if err != nil { + t.Fatal("DecodeAll:", err) + } + if img.LoopCount != tc.loopCount { + t.Errorf("loop count mismatch: %d vs %d", img.LoopCount, tc.loopCount) + } + if img.LoopCount != img1.LoopCount { + t.Errorf("loop count failed round-trip: %d vs %d", img.LoopCount, img1.LoopCount) + } + }) + } +} + +func TestUnexpectedEOF(t *testing.T) { + for i := len(testGIF) - 1; i >= 0; i-- { + _, err := Decode(bytes.NewReader(testGIF[:i])) + if err == errNotEnough { + continue + } + text := "" + if err != nil { + text = err.Error() + } + if !strings.HasPrefix(text, "gif:") || !strings.HasSuffix(text, ": unexpected EOF") { + t.Errorf("Decode(testGIF[:%d]) = %v, want gif: ...: unexpected EOF", i, err) + } + } +} + +// See golang.org/issue/22237 +func TestDecodeMemoryConsumption(t *testing.T) { + const frames = 3000 + img := image.NewPaletted(image.Rectangle{Max: image.Point{1, 1}}, palette.WebSafe) + hugeGIF := &GIF{ + Image: make([]*image.Paletted, frames), + Delay: make([]int, frames), + Disposal: make([]byte, frames), + } + for i := 0; i < frames; i++ { + hugeGIF.Image[i] = img + hugeGIF.Delay[i] = 60 + } + buf := new(bytes.Buffer) + if err := EncodeAll(buf, hugeGIF); err != nil { + t.Fatal("EncodeAll:", err) + } + s0, s1 := new(runtime.MemStats), new(runtime.MemStats) + runtime.GC() + defer debug.SetGCPercent(debug.SetGCPercent(5)) + runtime.ReadMemStats(s0) + if _, err := Decode(buf); err != nil { + t.Fatal("Decode:", err) + } + runtime.ReadMemStats(s1) + if heapDiff := int64(s1.HeapAlloc - s0.HeapAlloc); heapDiff > 30<<20 { + t.Fatalf("Decode of %d frames increased heap by %dMB", frames, heapDiff>>20) + } +} + +func BenchmarkDecode(b *testing.B) { + data, err := os.ReadFile("../testdata/video-001.gif") + if err != nil { + b.Fatal(err) + } + cfg, err := DecodeConfig(bytes.NewReader(data)) + if err != nil { + b.Fatal(err) + } + b.SetBytes(int64(cfg.Width * cfg.Height)) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Decode(bytes.NewReader(data)) + } +} diff --git a/src/image/gif/writer.go b/src/image/gif/writer.go new file mode 100644 index 0000000..7220446 --- /dev/null +++ b/src/image/gif/writer.go @@ -0,0 +1,477 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package gif + +import ( + "bufio" + "bytes" + "compress/lzw" + "errors" + "image" + "image/color" + "image/color/palette" + "image/draw" + "io" +) + +// Graphic control extension fields. +const ( + gcLabel = 0xF9 + gcBlockSize = 0x04 +) + +var log2Lookup = [8]int{2, 4, 8, 16, 32, 64, 128, 256} + +func log2(x int) int { + for i, v := range log2Lookup { + if x <= v { + return i + } + } + return -1 +} + +// Little-endian. +func writeUint16(b []uint8, u uint16) { + b[0] = uint8(u) + b[1] = uint8(u >> 8) +} + +// writer is a buffered writer. +type writer interface { + Flush() error + io.Writer + io.ByteWriter +} + +// encoder encodes an image to the GIF format. +type encoder struct { + // w is the writer to write to. err is the first error encountered during + // writing. All attempted writes after the first error become no-ops. + w writer + err error + // g is a reference to the data that is being encoded. + g GIF + // globalCT is the size in bytes of the global color table. + globalCT int + // buf is a scratch buffer. It must be at least 256 for the blockWriter. + buf [256]byte + globalColorTable [3 * 256]byte + localColorTable [3 * 256]byte +} + +// blockWriter writes the block structure of GIF image data, which +// comprises (n, (n bytes)) blocks, with 1 <= n <= 255. It is the +// writer given to the LZW encoder, which is thus immune to the +// blocking. +type blockWriter struct { + e *encoder +} + +func (b blockWriter) setup() { + b.e.buf[0] = 0 +} + +func (b blockWriter) Flush() error { + return b.e.err +} + +func (b blockWriter) WriteByte(c byte) error { + if b.e.err != nil { + return b.e.err + } + + // Append c to buffered sub-block. + b.e.buf[0]++ + b.e.buf[b.e.buf[0]] = c + if b.e.buf[0] < 255 { + return nil + } + + // Flush block + b.e.write(b.e.buf[:256]) + b.e.buf[0] = 0 + return b.e.err +} + +// blockWriter must be an io.Writer for lzw.NewWriter, but this is never +// actually called. +func (b blockWriter) Write(data []byte) (int, error) { + for i, c := range data { + if err := b.WriteByte(c); err != nil { + return i, err + } + } + return len(data), nil +} + +func (b blockWriter) close() { + // Write the block terminator (0x00), either by itself, or along with a + // pending sub-block. + if b.e.buf[0] == 0 { + b.e.writeByte(0) + } else { + n := uint(b.e.buf[0]) + b.e.buf[n+1] = 0 + b.e.write(b.e.buf[:n+2]) + } + b.e.flush() +} + +func (e *encoder) flush() { + if e.err != nil { + return + } + e.err = e.w.Flush() +} + +func (e *encoder) write(p []byte) { + if e.err != nil { + return + } + _, e.err = e.w.Write(p) +} + +func (e *encoder) writeByte(b byte) { + if e.err != nil { + return + } + e.err = e.w.WriteByte(b) +} + +func (e *encoder) writeHeader() { + if e.err != nil { + return + } + _, e.err = io.WriteString(e.w, "GIF89a") + if e.err != nil { + return + } + + // Logical screen width and height. + writeUint16(e.buf[0:2], uint16(e.g.Config.Width)) + writeUint16(e.buf[2:4], uint16(e.g.Config.Height)) + e.write(e.buf[:4]) + + if p, ok := e.g.Config.ColorModel.(color.Palette); ok && len(p) > 0 { + paddedSize := log2(len(p)) // Size of Global Color Table: 2^(1+n). + e.buf[0] = fColorTable | uint8(paddedSize) + e.buf[1] = e.g.BackgroundIndex + e.buf[2] = 0x00 // Pixel Aspect Ratio. + e.write(e.buf[:3]) + var err error + e.globalCT, err = encodeColorTable(e.globalColorTable[:], p, paddedSize) + if err != nil && e.err == nil { + e.err = err + return + } + e.write(e.globalColorTable[:e.globalCT]) + } else { + // All frames have a local color table, so a global color table + // is not needed. + e.buf[0] = 0x00 + e.buf[1] = 0x00 // Background Color Index. + e.buf[2] = 0x00 // Pixel Aspect Ratio. + e.write(e.buf[:3]) + } + + // Add animation info if necessary. + if len(e.g.Image) > 1 && e.g.LoopCount >= 0 { + e.buf[0] = 0x21 // Extension Introducer. + e.buf[1] = 0xff // Application Label. + e.buf[2] = 0x0b // Block Size. + e.write(e.buf[:3]) + _, err := io.WriteString(e.w, "NETSCAPE2.0") // Application Identifier. + if err != nil && e.err == nil { + e.err = err + return + } + e.buf[0] = 0x03 // Block Size. + e.buf[1] = 0x01 // Sub-block Index. + writeUint16(e.buf[2:4], uint16(e.g.LoopCount)) + e.buf[4] = 0x00 // Block Terminator. + e.write(e.buf[:5]) + } +} + +func encodeColorTable(dst []byte, p color.Palette, size int) (int, error) { + if uint(size) >= uint(len(log2Lookup)) { + return 0, errors.New("gif: cannot encode color table with more than 256 entries") + } + for i, c := range p { + if c == nil { + return 0, errors.New("gif: cannot encode color table with nil entries") + } + var r, g, b uint8 + // It is most likely that the palette is full of color.RGBAs, so they + // get a fast path. + if rgba, ok := c.(color.RGBA); ok { + r, g, b = rgba.R, rgba.G, rgba.B + } else { + rr, gg, bb, _ := c.RGBA() + r, g, b = uint8(rr>>8), uint8(gg>>8), uint8(bb>>8) + } + dst[3*i+0] = r + dst[3*i+1] = g + dst[3*i+2] = b + } + n := log2Lookup[size] + if n > len(p) { + // Pad with black. + fill := dst[3*len(p) : 3*n] + for i := range fill { + fill[i] = 0 + } + } + return 3 * n, nil +} + +func (e *encoder) colorTablesMatch(localLen, transparentIndex int) bool { + localSize := 3 * localLen + if transparentIndex >= 0 { + trOff := 3 * transparentIndex + return bytes.Equal(e.globalColorTable[:trOff], e.localColorTable[:trOff]) && + bytes.Equal(e.globalColorTable[trOff+3:localSize], e.localColorTable[trOff+3:localSize]) + } + return bytes.Equal(e.globalColorTable[:localSize], e.localColorTable[:localSize]) +} + +func (e *encoder) writeImageBlock(pm *image.Paletted, delay int, disposal byte) { + if e.err != nil { + return + } + + if len(pm.Palette) == 0 { + e.err = errors.New("gif: cannot encode image block with empty palette") + return + } + + b := pm.Bounds() + if b.Min.X < 0 || b.Max.X >= 1<<16 || b.Min.Y < 0 || b.Max.Y >= 1<<16 { + e.err = errors.New("gif: image block is too large to encode") + return + } + if !b.In(image.Rectangle{Max: image.Point{e.g.Config.Width, e.g.Config.Height}}) { + e.err = errors.New("gif: image block is out of bounds") + return + } + + transparentIndex := -1 + for i, c := range pm.Palette { + if c == nil { + e.err = errors.New("gif: cannot encode color table with nil entries") + return + } + if _, _, _, a := c.RGBA(); a == 0 { + transparentIndex = i + break + } + } + + if delay > 0 || disposal != 0 || transparentIndex != -1 { + e.buf[0] = sExtension // Extension Introducer. + e.buf[1] = gcLabel // Graphic Control Label. + e.buf[2] = gcBlockSize // Block Size. + if transparentIndex != -1 { + e.buf[3] = 0x01 | disposal<<2 + } else { + e.buf[3] = 0x00 | disposal<<2 + } + writeUint16(e.buf[4:6], uint16(delay)) // Delay Time (1/100ths of a second) + + // Transparent color index. + if transparentIndex != -1 { + e.buf[6] = uint8(transparentIndex) + } else { + e.buf[6] = 0x00 + } + e.buf[7] = 0x00 // Block Terminator. + e.write(e.buf[:8]) + } + e.buf[0] = sImageDescriptor + writeUint16(e.buf[1:3], uint16(b.Min.X)) + writeUint16(e.buf[3:5], uint16(b.Min.Y)) + writeUint16(e.buf[5:7], uint16(b.Dx())) + writeUint16(e.buf[7:9], uint16(b.Dy())) + e.write(e.buf[:9]) + + // To determine whether or not this frame's palette is the same as the + // global palette, we can check a couple things. First, do they actually + // point to the same []color.Color? If so, they are equal so long as the + // frame's palette is not longer than the global palette... + paddedSize := log2(len(pm.Palette)) // Size of Local Color Table: 2^(1+n). + if gp, ok := e.g.Config.ColorModel.(color.Palette); ok && len(pm.Palette) <= len(gp) && &gp[0] == &pm.Palette[0] { + e.writeByte(0) // Use the global color table. + } else { + ct, err := encodeColorTable(e.localColorTable[:], pm.Palette, paddedSize) + if err != nil { + if e.err == nil { + e.err = err + } + return + } + // This frame's palette is not the very same slice as the global + // palette, but it might be a copy, possibly with one value turned into + // transparency by DecodeAll. + if ct <= e.globalCT && e.colorTablesMatch(len(pm.Palette), transparentIndex) { + e.writeByte(0) // Use the global color table. + } else { + // Use a local color table. + e.writeByte(fColorTable | uint8(paddedSize)) + e.write(e.localColorTable[:ct]) + } + } + + litWidth := paddedSize + 1 + if litWidth < 2 { + litWidth = 2 + } + e.writeByte(uint8(litWidth)) // LZW Minimum Code Size. + + bw := blockWriter{e: e} + bw.setup() + lzww := lzw.NewWriter(bw, lzw.LSB, litWidth) + if dx := b.Dx(); dx == pm.Stride { + _, e.err = lzww.Write(pm.Pix[:dx*b.Dy()]) + if e.err != nil { + lzww.Close() + return + } + } else { + for i, y := 0, b.Min.Y; y < b.Max.Y; i, y = i+pm.Stride, y+1 { + _, e.err = lzww.Write(pm.Pix[i : i+dx]) + if e.err != nil { + lzww.Close() + return + } + } + } + lzww.Close() // flush to bw + bw.close() // flush to e.w +} + +// Options are the encoding parameters. +type Options struct { + // NumColors is the maximum number of colors used in the image. + // It ranges from 1 to 256. + NumColors int + + // Quantizer is used to produce a palette with size NumColors. + // palette.Plan9 is used in place of a nil Quantizer. + Quantizer draw.Quantizer + + // Drawer is used to convert the source image to the desired palette. + // draw.FloydSteinberg is used in place of a nil Drawer. + Drawer draw.Drawer +} + +// EncodeAll writes the images in g to w in GIF format with the +// given loop count and delay between frames. +func EncodeAll(w io.Writer, g *GIF) error { + if len(g.Image) == 0 { + return errors.New("gif: must provide at least one image") + } + + if len(g.Image) != len(g.Delay) { + return errors.New("gif: mismatched image and delay lengths") + } + + e := encoder{g: *g} + // The GIF.Disposal, GIF.Config and GIF.BackgroundIndex fields were added + // in Go 1.5. Valid Go 1.4 code, such as when the Disposal field is omitted + // in a GIF struct literal, should still produce valid GIFs. + if e.g.Disposal != nil && len(e.g.Image) != len(e.g.Disposal) { + return errors.New("gif: mismatched image and disposal lengths") + } + if e.g.Config == (image.Config{}) { + p := g.Image[0].Bounds().Max + e.g.Config.Width = p.X + e.g.Config.Height = p.Y + } else if e.g.Config.ColorModel != nil { + if _, ok := e.g.Config.ColorModel.(color.Palette); !ok { + return errors.New("gif: GIF color model must be a color.Palette") + } + } + + if ww, ok := w.(writer); ok { + e.w = ww + } else { + e.w = bufio.NewWriter(w) + } + + e.writeHeader() + for i, pm := range g.Image { + disposal := uint8(0) + if g.Disposal != nil { + disposal = g.Disposal[i] + } + e.writeImageBlock(pm, g.Delay[i], disposal) + } + e.writeByte(sTrailer) + e.flush() + return e.err +} + +// Encode writes the Image m to w in GIF format. +func Encode(w io.Writer, m image.Image, o *Options) error { + // Check for bounds and size restrictions. + b := m.Bounds() + if b.Dx() >= 1<<16 || b.Dy() >= 1<<16 { + return errors.New("gif: image is too large to encode") + } + + opts := Options{} + if o != nil { + opts = *o + } + if opts.NumColors < 1 || 256 < opts.NumColors { + opts.NumColors = 256 + } + if opts.Drawer == nil { + opts.Drawer = draw.FloydSteinberg + } + + pm, _ := m.(*image.Paletted) + if pm == nil { + if cp, ok := m.ColorModel().(color.Palette); ok { + pm = image.NewPaletted(b, cp) + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + pm.Set(x, y, cp.Convert(m.At(x, y))) + } + } + } + } + if pm == nil || len(pm.Palette) > opts.NumColors { + // Set pm to be a palettedized copy of m, including its bounds, which + // might not start at (0, 0). + // + // TODO: Pick a better sub-sample of the Plan 9 palette. + pm = image.NewPaletted(b, palette.Plan9[:opts.NumColors]) + if opts.Quantizer != nil { + pm.Palette = opts.Quantizer.Quantize(make(color.Palette, 0, opts.NumColors), m) + } + opts.Drawer.Draw(pm, b, m, b.Min) + } + + // When calling Encode instead of EncodeAll, the single-frame image is + // translated such that its top-left corner is (0, 0), so that the single + // frame completely fills the overall GIF's bounds. + if pm.Rect.Min != (image.Point{}) { + dup := *pm + dup.Rect = dup.Rect.Sub(dup.Rect.Min) + pm = &dup + } + + return EncodeAll(w, &GIF{ + Image: []*image.Paletted{pm}, + Delay: []int{0}, + Config: image.Config{ + ColorModel: pm.Palette, + Width: b.Dx(), + Height: b.Dy(), + }, + }) +} diff --git a/src/image/gif/writer_test.go b/src/image/gif/writer_test.go new file mode 100644 index 0000000..af0105c --- /dev/null +++ b/src/image/gif/writer_test.go @@ -0,0 +1,734 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package gif + +import ( + "bytes" + "image" + "image/color" + "image/color/palette" + "image/draw" + _ "image/png" + "io" + "math/rand" + "os" + "reflect" + "testing" +) + +func readImg(filename string) (image.Image, error) { + f, err := os.Open(filename) + if err != nil { + return nil, err + } + defer f.Close() + m, _, err := image.Decode(f) + return m, err +} + +func readGIF(filename string) (*GIF, error) { + f, err := os.Open(filename) + if err != nil { + return nil, err + } + defer f.Close() + return DecodeAll(f) +} + +func delta(u0, u1 uint32) int64 { + d := int64(u0) - int64(u1) + if d < 0 { + return -d + } + return d +} + +// averageDelta returns the average delta in RGB space. The two images must +// have the same bounds. +func averageDelta(m0, m1 image.Image) int64 { + b := m0.Bounds() + return averageDeltaBound(m0, m1, b, b) +} + +// averageDeltaBounds returns the average delta in RGB space. The average delta is +// calculated in the specified bounds. +func averageDeltaBound(m0, m1 image.Image, b0, b1 image.Rectangle) int64 { + var sum, n int64 + for y := b0.Min.Y; y < b0.Max.Y; y++ { + for x := b0.Min.X; x < b0.Max.X; x++ { + c0 := m0.At(x, y) + c1 := m1.At(x-b0.Min.X+b1.Min.X, y-b0.Min.Y+b1.Min.Y) + r0, g0, b0, _ := c0.RGBA() + r1, g1, b1, _ := c1.RGBA() + sum += delta(r0, r1) + sum += delta(g0, g1) + sum += delta(b0, b1) + n += 3 + } + } + return sum / n +} + +// lzw.NewWriter wants an interface which is basically the same thing as gif's +// writer interface. This ensures we're compatible. +var _ writer = blockWriter{} + +var testCase = []struct { + filename string + tolerance int64 +}{ + {"../testdata/video-001.png", 1 << 12}, + {"../testdata/video-001.gif", 0}, + {"../testdata/video-001.interlaced.gif", 0}, +} + +func TestWriter(t *testing.T) { + for _, tc := range testCase { + m0, err := readImg(tc.filename) + if err != nil { + t.Error(tc.filename, err) + continue + } + var buf bytes.Buffer + err = Encode(&buf, m0, nil) + if err != nil { + t.Error(tc.filename, err) + continue + } + m1, err := Decode(&buf) + if err != nil { + t.Error(tc.filename, err) + continue + } + if m0.Bounds() != m1.Bounds() { + t.Errorf("%s, bounds differ: %v and %v", tc.filename, m0.Bounds(), m1.Bounds()) + continue + } + // Compare the average delta to the tolerance level. + avgDelta := averageDelta(m0, m1) + if avgDelta > tc.tolerance { + t.Errorf("%s: average delta is too high. expected: %d, got %d", tc.filename, tc.tolerance, avgDelta) + continue + } + } +} + +func TestSubImage(t *testing.T) { + m0, err := readImg("../testdata/video-001.gif") + if err != nil { + t.Fatalf("readImg: %v", err) + } + m0 = m0.(*image.Paletted).SubImage(image.Rect(0, 0, 50, 30)) + var buf bytes.Buffer + err = Encode(&buf, m0, nil) + if err != nil { + t.Fatalf("Encode: %v", err) + } + m1, err := Decode(&buf) + if err != nil { + t.Fatalf("Decode: %v", err) + } + if m0.Bounds() != m1.Bounds() { + t.Fatalf("bounds differ: %v and %v", m0.Bounds(), m1.Bounds()) + } + if averageDelta(m0, m1) != 0 { + t.Fatalf("images differ") + } +} + +// palettesEqual reports whether two color.Palette values are equal, ignoring +// any trailing opaque-black palette entries. +func palettesEqual(p, q color.Palette) bool { + n := len(p) + if n > len(q) { + n = len(q) + } + for i := 0; i < n; i++ { + if p[i] != q[i] { + return false + } + } + for i := n; i < len(p); i++ { + r, g, b, a := p[i].RGBA() + if r != 0 || g != 0 || b != 0 || a != 0xffff { + return false + } + } + for i := n; i < len(q); i++ { + r, g, b, a := q[i].RGBA() + if r != 0 || g != 0 || b != 0 || a != 0xffff { + return false + } + } + return true +} + +var frames = []string{ + "../testdata/video-001.gif", + "../testdata/video-005.gray.gif", +} + +func testEncodeAll(t *testing.T, go1Dot5Fields bool, useGlobalColorModel bool) { + const width, height = 150, 103 + + g0 := &GIF{ + Image: make([]*image.Paletted, len(frames)), + Delay: make([]int, len(frames)), + LoopCount: 5, + } + for i, f := range frames { + g, err := readGIF(f) + if err != nil { + t.Fatal(f, err) + } + m := g.Image[0] + if m.Bounds().Dx() != width || m.Bounds().Dy() != height { + t.Fatalf("frame %d had unexpected bounds: got %v, want width/height = %d/%d", + i, m.Bounds(), width, height) + } + g0.Image[i] = m + } + // The GIF.Disposal, GIF.Config and GIF.BackgroundIndex fields were added + // in Go 1.5. Valid Go 1.4 or earlier code should still produce valid GIFs. + // + // On the following line, color.Model is an interface type, and + // color.Palette is a concrete (slice) type. + globalColorModel, backgroundIndex := color.Model(color.Palette(nil)), uint8(0) + if useGlobalColorModel { + globalColorModel, backgroundIndex = color.Palette(palette.WebSafe), uint8(1) + } + if go1Dot5Fields { + g0.Disposal = make([]byte, len(g0.Image)) + for i := range g0.Disposal { + g0.Disposal[i] = DisposalNone + } + g0.Config = image.Config{ + ColorModel: globalColorModel, + Width: width, + Height: height, + } + g0.BackgroundIndex = backgroundIndex + } + + var buf bytes.Buffer + if err := EncodeAll(&buf, g0); err != nil { + t.Fatal("EncodeAll:", err) + } + encoded := buf.Bytes() + config, err := DecodeConfig(bytes.NewReader(encoded)) + if err != nil { + t.Fatal("DecodeConfig:", err) + } + g1, err := DecodeAll(bytes.NewReader(encoded)) + if err != nil { + t.Fatal("DecodeAll:", err) + } + + if !reflect.DeepEqual(config, g1.Config) { + t.Errorf("DecodeConfig inconsistent with DecodeAll") + } + if !palettesEqual(g1.Config.ColorModel.(color.Palette), globalColorModel.(color.Palette)) { + t.Errorf("unexpected global color model") + } + if w, h := g1.Config.Width, g1.Config.Height; w != width || h != height { + t.Errorf("got config width * height = %d * %d, want %d * %d", w, h, width, height) + } + + if g0.LoopCount != g1.LoopCount { + t.Errorf("loop counts differ: %d and %d", g0.LoopCount, g1.LoopCount) + } + if backgroundIndex != g1.BackgroundIndex { + t.Errorf("background indexes differ: %d and %d", backgroundIndex, g1.BackgroundIndex) + } + if len(g0.Image) != len(g1.Image) { + t.Fatalf("image lengths differ: %d and %d", len(g0.Image), len(g1.Image)) + } + if len(g1.Image) != len(g1.Delay) { + t.Fatalf("image and delay lengths differ: %d and %d", len(g1.Image), len(g1.Delay)) + } + if len(g1.Image) != len(g1.Disposal) { + t.Fatalf("image and disposal lengths differ: %d and %d", len(g1.Image), len(g1.Disposal)) + } + + for i := range g0.Image { + m0, m1 := g0.Image[i], g1.Image[i] + if m0.Bounds() != m1.Bounds() { + t.Errorf("frame %d: bounds differ: %v and %v", i, m0.Bounds(), m1.Bounds()) + } + d0, d1 := g0.Delay[i], g1.Delay[i] + if d0 != d1 { + t.Errorf("frame %d: delay values differ: %d and %d", i, d0, d1) + } + p0, p1 := uint8(0), g1.Disposal[i] + if go1Dot5Fields { + p0 = DisposalNone + } + if p0 != p1 { + t.Errorf("frame %d: disposal values differ: %d and %d", i, p0, p1) + } + } +} + +func TestEncodeAllGo1Dot4(t *testing.T) { testEncodeAll(t, false, false) } +func TestEncodeAllGo1Dot5(t *testing.T) { testEncodeAll(t, true, false) } +func TestEncodeAllGo1Dot5GlobalColorModel(t *testing.T) { testEncodeAll(t, true, true) } + +func TestEncodeMismatchDelay(t *testing.T) { + images := make([]*image.Paletted, 2) + for i := range images { + images[i] = image.NewPaletted(image.Rect(0, 0, 5, 5), palette.Plan9) + } + + g0 := &GIF{ + Image: images, + Delay: make([]int, 1), + } + if err := EncodeAll(io.Discard, g0); err == nil { + t.Error("expected error from mismatched delay and image slice lengths") + } + + g1 := &GIF{ + Image: images, + Delay: make([]int, len(images)), + Disposal: make([]byte, 1), + } + for i := range g1.Disposal { + g1.Disposal[i] = DisposalNone + } + if err := EncodeAll(io.Discard, g1); err == nil { + t.Error("expected error from mismatched disposal and image slice lengths") + } +} + +func TestEncodeZeroGIF(t *testing.T) { + if err := EncodeAll(io.Discard, &GIF{}); err == nil { + t.Error("expected error from providing empty gif") + } +} + +func TestEncodeAllFramesOutOfBounds(t *testing.T) { + images := []*image.Paletted{ + image.NewPaletted(image.Rect(0, 0, 5, 5), palette.Plan9), + image.NewPaletted(image.Rect(2, 2, 8, 8), palette.Plan9), + image.NewPaletted(image.Rect(3, 3, 4, 4), palette.Plan9), + } + for _, upperBound := range []int{6, 10} { + g := &GIF{ + Image: images, + Delay: make([]int, len(images)), + Disposal: make([]byte, len(images)), + Config: image.Config{ + Width: upperBound, + Height: upperBound, + }, + } + err := EncodeAll(io.Discard, g) + if upperBound >= 8 { + if err != nil { + t.Errorf("upperBound=%d: %v", upperBound, err) + } + } else { + if err == nil { + t.Errorf("upperBound=%d: got nil error, want non-nil", upperBound) + } + } + } +} + +func TestEncodeNonZeroMinPoint(t *testing.T) { + points := []image.Point{ + {-8, -9}, + {-4, -4}, + {-3, +3}, + {+0, +0}, + {+2, +2}, + } + for _, p := range points { + src := image.NewPaletted(image.Rectangle{ + Min: p, + Max: p.Add(image.Point{6, 6}), + }, palette.Plan9) + var buf bytes.Buffer + if err := Encode(&buf, src, nil); err != nil { + t.Errorf("p=%v: Encode: %v", p, err) + continue + } + m, err := Decode(&buf) + if err != nil { + t.Errorf("p=%v: Decode: %v", p, err) + continue + } + if got, want := m.Bounds(), image.Rect(0, 0, 6, 6); got != want { + t.Errorf("p=%v: got %v, want %v", p, got, want) + } + } + + // Also test having a source image (gray on the diagonal) that has a + // non-zero Bounds().Min, but isn't an image.Paletted. + { + p := image.Point{+2, +2} + src := image.NewRGBA(image.Rectangle{ + Min: p, + Max: p.Add(image.Point{6, 6}), + }) + src.SetRGBA(2, 2, color.RGBA{0x22, 0x22, 0x22, 0xFF}) + src.SetRGBA(3, 3, color.RGBA{0x33, 0x33, 0x33, 0xFF}) + src.SetRGBA(4, 4, color.RGBA{0x44, 0x44, 0x44, 0xFF}) + src.SetRGBA(5, 5, color.RGBA{0x55, 0x55, 0x55, 0xFF}) + src.SetRGBA(6, 6, color.RGBA{0x66, 0x66, 0x66, 0xFF}) + src.SetRGBA(7, 7, color.RGBA{0x77, 0x77, 0x77, 0xFF}) + + var buf bytes.Buffer + if err := Encode(&buf, src, nil); err != nil { + t.Errorf("gray-diagonal: Encode: %v", err) + return + } + m, err := Decode(&buf) + if err != nil { + t.Errorf("gray-diagonal: Decode: %v", err) + return + } + if got, want := m.Bounds(), image.Rect(0, 0, 6, 6); got != want { + t.Errorf("gray-diagonal: got %v, want %v", got, want) + return + } + + rednessAt := func(x int, y int) uint32 { + r, _, _, _ := m.At(x, y).RGBA() + // Shift by 8 to convert from 16 bit color to 8 bit color. + return r >> 8 + } + + // Round-tripping a still (non-animated) image.Image through + // Encode+Decode should shift the origin to (0, 0). + if got, want := rednessAt(0, 0), uint32(0x22); got != want { + t.Errorf("gray-diagonal: rednessAt(0, 0): got 0x%02x, want 0x%02x", got, want) + } + if got, want := rednessAt(5, 5), uint32(0x77); got != want { + t.Errorf("gray-diagonal: rednessAt(5, 5): got 0x%02x, want 0x%02x", got, want) + } + } +} + +func TestEncodeImplicitConfigSize(t *testing.T) { + // For backwards compatibility for Go 1.4 and earlier code, the Config + // field is optional, and if zero, the width and height is implied by the + // first (and in this case only) frame's width and height. + // + // A Config only specifies a width and height (two integers) while an + // image.Image's Bounds method returns an image.Rectangle (four integers). + // For a gif.GIF, the overall bounds' top-left point is always implicitly + // (0, 0), and any frame whose bounds have a negative X or Y will be + // outside those overall bounds, so encoding should fail. + for _, lowerBound := range []int{-1, 0, 1} { + images := []*image.Paletted{ + image.NewPaletted(image.Rect(lowerBound, lowerBound, 4, 4), palette.Plan9), + } + g := &GIF{ + Image: images, + Delay: make([]int, len(images)), + } + err := EncodeAll(io.Discard, g) + if lowerBound >= 0 { + if err != nil { + t.Errorf("lowerBound=%d: %v", lowerBound, err) + } + } else { + if err == nil { + t.Errorf("lowerBound=%d: got nil error, want non-nil", lowerBound) + } + } + } +} + +func TestEncodePalettes(t *testing.T) { + const w, h = 5, 5 + pals := []color.Palette{{ + color.RGBA{0x00, 0x00, 0x00, 0xff}, + color.RGBA{0x01, 0x00, 0x00, 0xff}, + color.RGBA{0x02, 0x00, 0x00, 0xff}, + }, { + color.RGBA{0x00, 0x00, 0x00, 0xff}, + color.RGBA{0x00, 0x01, 0x00, 0xff}, + }, { + color.RGBA{0x00, 0x00, 0x03, 0xff}, + color.RGBA{0x00, 0x00, 0x02, 0xff}, + color.RGBA{0x00, 0x00, 0x01, 0xff}, + color.RGBA{0x00, 0x00, 0x00, 0xff}, + }, { + color.RGBA{0x10, 0x07, 0xf0, 0xff}, + color.RGBA{0x20, 0x07, 0xf0, 0xff}, + color.RGBA{0x30, 0x07, 0xf0, 0xff}, + color.RGBA{0x40, 0x07, 0xf0, 0xff}, + color.RGBA{0x50, 0x07, 0xf0, 0xff}, + }} + g0 := &GIF{ + Image: []*image.Paletted{ + image.NewPaletted(image.Rect(0, 0, w, h), pals[0]), + image.NewPaletted(image.Rect(0, 0, w, h), pals[1]), + image.NewPaletted(image.Rect(0, 0, w, h), pals[2]), + image.NewPaletted(image.Rect(0, 0, w, h), pals[3]), + }, + Delay: make([]int, len(pals)), + Disposal: make([]byte, len(pals)), + Config: image.Config{ + ColorModel: pals[2], + Width: w, + Height: h, + }, + } + + var buf bytes.Buffer + if err := EncodeAll(&buf, g0); err != nil { + t.Fatalf("EncodeAll: %v", err) + } + g1, err := DecodeAll(&buf) + if err != nil { + t.Fatalf("DecodeAll: %v", err) + } + if len(g0.Image) != len(g1.Image) { + t.Fatalf("image lengths differ: %d and %d", len(g0.Image), len(g1.Image)) + } + for i, m := range g1.Image { + if got, want := m.Palette, pals[i]; !palettesEqual(got, want) { + t.Errorf("frame %d:\ngot %v\nwant %v", i, got, want) + } + } +} + +func TestEncodeBadPalettes(t *testing.T) { + const w, h = 5, 5 + for _, n := range []int{256, 257} { + for _, nilColors := range []bool{false, true} { + pal := make(color.Palette, n) + if !nilColors { + for i := range pal { + pal[i] = color.Black + } + } + + err := EncodeAll(io.Discard, &GIF{ + Image: []*image.Paletted{ + image.NewPaletted(image.Rect(0, 0, w, h), pal), + }, + Delay: make([]int, 1), + Disposal: make([]byte, 1), + Config: image.Config{ + ColorModel: pal, + Width: w, + Height: h, + }, + }) + + got := err != nil + want := n > 256 || nilColors + if got != want { + t.Errorf("n=%d, nilColors=%t: err != nil: got %t, want %t", n, nilColors, got, want) + } + } + } +} + +func TestColorTablesMatch(t *testing.T) { + const trIdx = 100 + global := color.Palette(palette.Plan9) + if rgb := global[trIdx].(color.RGBA); rgb.R == 0 && rgb.G == 0 && rgb.B == 0 { + t.Fatalf("trIdx (%d) is already black", trIdx) + } + + // Make a copy of the palette, substituting trIdx's slot with transparent, + // just like decoder.decode. + local := append(color.Palette(nil), global...) + local[trIdx] = color.RGBA{} + + const testLen = 3 * 256 + const padded = 7 + e := new(encoder) + if l, err := encodeColorTable(e.globalColorTable[:], global, padded); err != nil || l != testLen { + t.Fatalf("Failed to encode global color table: got %d, %v; want nil, %d", l, err, testLen) + } + if l, err := encodeColorTable(e.localColorTable[:], local, padded); err != nil || l != testLen { + t.Fatalf("Failed to encode local color table: got %d, %v; want nil, %d", l, err, testLen) + } + if bytes.Equal(e.globalColorTable[:testLen], e.localColorTable[:testLen]) { + t.Fatal("Encoded color tables are equal, expected mismatch") + } + if !e.colorTablesMatch(len(local), trIdx) { + t.Fatal("colorTablesMatch() == false, expected true") + } +} + +func TestEncodeCroppedSubImages(t *testing.T) { + // This test means to ensure that Encode honors the Bounds and Strides of + // images correctly when encoding. + whole := image.NewPaletted(image.Rect(0, 0, 100, 100), palette.Plan9) + subImages := []image.Rectangle{ + image.Rect(0, 0, 50, 50), + image.Rect(50, 0, 100, 50), + image.Rect(0, 50, 50, 50), + image.Rect(50, 50, 100, 100), + image.Rect(25, 25, 75, 75), + image.Rect(0, 0, 100, 50), + image.Rect(0, 50, 100, 100), + image.Rect(0, 0, 50, 100), + image.Rect(50, 0, 100, 100), + } + for _, sr := range subImages { + si := whole.SubImage(sr) + buf := bytes.NewBuffer(nil) + if err := Encode(buf, si, nil); err != nil { + t.Errorf("Encode: sr=%v: %v", sr, err) + continue + } + if _, err := Decode(buf); err != nil { + t.Errorf("Decode: sr=%v: %v", sr, err) + } + } +} + +type offsetImage struct { + image.Image + Rect image.Rectangle +} + +func (i offsetImage) Bounds() image.Rectangle { + return i.Rect +} + +func TestEncodeWrappedImage(t *testing.T) { + m0, err := readImg("../testdata/video-001.gif") + if err != nil { + t.Fatalf("readImg: %v", err) + } + + // Case 1: Enocde a wrapped image.Image + buf := new(bytes.Buffer) + w0 := offsetImage{m0, m0.Bounds()} + err = Encode(buf, w0, nil) + if err != nil { + t.Fatalf("Encode: %v", err) + } + w1, err := Decode(buf) + if err != nil { + t.Fatalf("Dencode: %v", err) + } + avgDelta := averageDelta(m0, w1) + if avgDelta > 0 { + t.Fatalf("Wrapped: average delta is too high. expected: 0, got %d", avgDelta) + } + + // Case 2: Enocde a wrapped image.Image with offset + b0 := image.Rectangle{ + Min: image.Point{ + X: 128, + Y: 64, + }, + Max: image.Point{ + X: 256, + Y: 128, + }, + } + w0 = offsetImage{m0, b0} + buf = new(bytes.Buffer) + err = Encode(buf, w0, nil) + if err != nil { + t.Fatalf("Encode: %v", err) + } + w1, err = Decode(buf) + if err != nil { + t.Fatalf("Dencode: %v", err) + } + + b1 := image.Rectangle{ + Min: image.Point{ + X: 0, + Y: 0, + }, + Max: image.Point{ + X: 128, + Y: 64, + }, + } + avgDelta = averageDeltaBound(m0, w1, b0, b1) + if avgDelta > 0 { + t.Fatalf("Wrapped and offset: average delta is too high. expected: 0, got %d", avgDelta) + } +} + +func BenchmarkEncodeRandomPaletted(b *testing.B) { + paletted := image.NewPaletted(image.Rect(0, 0, 640, 480), palette.Plan9) + rnd := rand.New(rand.NewSource(123)) + for i := range paletted.Pix { + paletted.Pix[i] = uint8(rnd.Intn(256)) + } + + b.SetBytes(640 * 480 * 1) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, paletted, nil) + } +} + +func BenchmarkEncodeRandomRGBA(b *testing.B) { + rgba := image.NewRGBA(image.Rect(0, 0, 640, 480)) + bo := rgba.Bounds() + rnd := rand.New(rand.NewSource(123)) + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + rgba.SetRGBA(x, y, color.RGBA{ + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + 255, + }) + } + } + + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, rgba, nil) + } +} + +func BenchmarkEncodeRealisticPaletted(b *testing.B) { + img, err := readImg("../testdata/video-001.png") + if err != nil { + b.Fatalf("readImg: %v", err) + } + bo := img.Bounds() + paletted := image.NewPaletted(bo, palette.Plan9) + draw.Draw(paletted, bo, img, bo.Min, draw.Src) + + b.SetBytes(int64(bo.Dx() * bo.Dy() * 1)) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, paletted, nil) + } +} + +func BenchmarkEncodeRealisticRGBA(b *testing.B) { + img, err := readImg("../testdata/video-001.png") + if err != nil { + b.Fatalf("readImg: %v", err) + } + bo := img.Bounds() + // Converting img to rgba is redundant for video-001.png, which is already + // in the RGBA format, but for those copy/pasting this benchmark (but + // changing the source image), the conversion ensures that we're still + // benchmarking encoding an RGBA image. + rgba := image.NewRGBA(bo) + draw.Draw(rgba, bo, img, bo.Min, draw.Src) + + b.SetBytes(int64(bo.Dx() * bo.Dy() * 4)) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, rgba, nil) + } +} diff --git a/src/image/image.go b/src/image/image.go new file mode 100644 index 0000000..930d9ac --- /dev/null +++ b/src/image/image.go @@ -0,0 +1,1271 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package image implements a basic 2-D image library. +// +// The fundamental interface is called Image. An Image contains colors, which +// are described in the image/color package. +// +// Values of the Image interface are created either by calling functions such +// as NewRGBA and NewPaletted, or by calling Decode on an io.Reader containing +// image data in a format such as GIF, JPEG or PNG. Decoding any particular +// image format requires the prior registration of a decoder function. +// Registration is typically automatic as a side effect of initializing that +// format's package so that, to decode a PNG image, it suffices to have +// import _ "image/png" +// in a program's main package. The _ means to import a package purely for its +// initialization side effects. +// +// See "The Go image package" for more details: +// https://golang.org/doc/articles/image_package.html +package image + +import ( + "image/color" +) + +// Config holds an image's color model and dimensions. +type Config struct { + ColorModel color.Model + Width, Height int +} + +// Image is a finite rectangular grid of color.Color values taken from a color +// model. +type Image interface { + // ColorModel returns the Image's color model. + ColorModel() color.Model + // Bounds returns the domain for which At can return non-zero color. + // The bounds do not necessarily contain the point (0, 0). + Bounds() Rectangle + // At returns the color of the pixel at (x, y). + // At(Bounds().Min.X, Bounds().Min.Y) returns the upper-left pixel of the grid. + // At(Bounds().Max.X-1, Bounds().Max.Y-1) returns the lower-right one. + At(x, y int) color.Color +} + +// RGBA64Image is an Image whose pixels can be converted directly to a +// color.RGBA64. +type RGBA64Image interface { + // RGBA64At returns the RGBA64 color of the pixel at (x, y). It is + // equivalent to calling At(x, y).RGBA() and converting the resulting + // 32-bit return values to a color.RGBA64, but it can avoid allocations + // from converting concrete color types to the color.Color interface type. + RGBA64At(x, y int) color.RGBA64 + Image +} + +// PalettedImage is an image whose colors may come from a limited palette. +// If m is a PalettedImage and m.ColorModel() returns a color.Palette p, +// then m.At(x, y) should be equivalent to p[m.ColorIndexAt(x, y)]. If m's +// color model is not a color.Palette, then ColorIndexAt's behavior is +// undefined. +type PalettedImage interface { + // ColorIndexAt returns the palette index of the pixel at (x, y). + ColorIndexAt(x, y int) uint8 + Image +} + +// pixelBufferLength returns the length of the []uint8 typed Pix slice field +// for the NewXxx functions. Conceptually, this is just (bpp * width * height), +// but this function panics if at least one of those is negative or if the +// computation would overflow the int type. +// +// This panics instead of returning an error because of backwards +// compatibility. The NewXxx functions do not return an error. +func pixelBufferLength(bytesPerPixel int, r Rectangle, imageTypeName string) int { + totalLength := mul3NonNeg(bytesPerPixel, r.Dx(), r.Dy()) + if totalLength < 0 { + panic("image: New" + imageTypeName + " Rectangle has huge or negative dimensions") + } + return totalLength +} + +// RGBA is an in-memory image whose At method returns color.RGBA values. +type RGBA struct { + // Pix holds the image's pixels, in R, G, B, A order. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*4]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *RGBA) ColorModel() color.Model { return color.RGBAModel } + +func (p *RGBA) Bounds() Rectangle { return p.Rect } + +func (p *RGBA) At(x, y int) color.Color { + return p.RGBAAt(x, y) +} + +func (p *RGBA) RGBA64At(x, y int) color.RGBA64 { + if !(Point{x, y}.In(p.Rect)) { + return color.RGBA64{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + r := uint16(s[0]) + g := uint16(s[1]) + b := uint16(s[2]) + a := uint16(s[3]) + return color.RGBA64{ + (r << 8) | r, + (g << 8) | g, + (b << 8) | b, + (a << 8) | a, + } +} + +func (p *RGBA) RGBAAt(x, y int) color.RGBA { + if !(Point{x, y}.In(p.Rect)) { + return color.RGBA{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + return color.RGBA{s[0], s[1], s[2], s[3]} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *RGBA) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4 +} + +func (p *RGBA) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.RGBAModel.Convert(c).(color.RGBA) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c1.R + s[1] = c1.G + s[2] = c1.B + s[3] = c1.A +} + +func (p *RGBA) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(c.R >> 8) + s[1] = uint8(c.G >> 8) + s[2] = uint8(c.B >> 8) + s[3] = uint8(c.A >> 8) +} + +func (p *RGBA) SetRGBA(x, y int, c color.RGBA) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c.R + s[1] = c.G + s[2] = c.B + s[3] = c.A +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *RGBA) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &RGBA{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &RGBA{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *RGBA) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 3, p.Rect.Dx()*4 + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i += 4 { + if p.Pix[i] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewRGBA returns a new RGBA image with the given bounds. +func NewRGBA(r Rectangle) *RGBA { + return &RGBA{ + Pix: make([]uint8, pixelBufferLength(4, r, "RGBA")), + Stride: 4 * r.Dx(), + Rect: r, + } +} + +// RGBA64 is an in-memory image whose At method returns color.RGBA64 values. +type RGBA64 struct { + // Pix holds the image's pixels, in R, G, B, A order and big-endian format. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*8]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *RGBA64) ColorModel() color.Model { return color.RGBA64Model } + +func (p *RGBA64) Bounds() Rectangle { return p.Rect } + +func (p *RGBA64) At(x, y int) color.Color { + return p.RGBA64At(x, y) +} + +func (p *RGBA64) RGBA64At(x, y int) color.RGBA64 { + if !(Point{x, y}.In(p.Rect)) { + return color.RGBA64{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + return color.RGBA64{ + uint16(s[0])<<8 | uint16(s[1]), + uint16(s[2])<<8 | uint16(s[3]), + uint16(s[4])<<8 | uint16(s[5]), + uint16(s[6])<<8 | uint16(s[7]), + } +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *RGBA64) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*8 +} + +func (p *RGBA64) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.RGBA64Model.Convert(c).(color.RGBA64) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(c1.R >> 8) + s[1] = uint8(c1.R) + s[2] = uint8(c1.G >> 8) + s[3] = uint8(c1.G) + s[4] = uint8(c1.B >> 8) + s[5] = uint8(c1.B) + s[6] = uint8(c1.A >> 8) + s[7] = uint8(c1.A) +} + +func (p *RGBA64) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(c.R >> 8) + s[1] = uint8(c.R) + s[2] = uint8(c.G >> 8) + s[3] = uint8(c.G) + s[4] = uint8(c.B >> 8) + s[5] = uint8(c.B) + s[6] = uint8(c.A >> 8) + s[7] = uint8(c.A) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *RGBA64) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &RGBA64{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &RGBA64{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *RGBA64) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 6, p.Rect.Dx()*8 + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i += 8 { + if p.Pix[i+0] != 0xff || p.Pix[i+1] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewRGBA64 returns a new RGBA64 image with the given bounds. +func NewRGBA64(r Rectangle) *RGBA64 { + return &RGBA64{ + Pix: make([]uint8, pixelBufferLength(8, r, "RGBA64")), + Stride: 8 * r.Dx(), + Rect: r, + } +} + +// NRGBA is an in-memory image whose At method returns color.NRGBA values. +type NRGBA struct { + // Pix holds the image's pixels, in R, G, B, A order. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*4]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *NRGBA) ColorModel() color.Model { return color.NRGBAModel } + +func (p *NRGBA) Bounds() Rectangle { return p.Rect } + +func (p *NRGBA) At(x, y int) color.Color { + return p.NRGBAAt(x, y) +} + +func (p *NRGBA) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := p.NRGBAAt(x, y).RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func (p *NRGBA) NRGBAAt(x, y int) color.NRGBA { + if !(Point{x, y}.In(p.Rect)) { + return color.NRGBA{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + return color.NRGBA{s[0], s[1], s[2], s[3]} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *NRGBA) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4 +} + +func (p *NRGBA) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.NRGBAModel.Convert(c).(color.NRGBA) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c1.R + s[1] = c1.G + s[2] = c1.B + s[3] = c1.A +} + +func (p *NRGBA) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + r, g, b, a := uint32(c.R), uint32(c.G), uint32(c.B), uint32(c.A) + if (a != 0) && (a != 0xffff) { + r = (r * 0xffff) / a + g = (g * 0xffff) / a + b = (b * 0xffff) / a + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(r >> 8) + s[1] = uint8(g >> 8) + s[2] = uint8(b >> 8) + s[3] = uint8(a >> 8) +} + +func (p *NRGBA) SetNRGBA(x, y int, c color.NRGBA) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c.R + s[1] = c.G + s[2] = c.B + s[3] = c.A +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *NRGBA) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &NRGBA{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &NRGBA{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *NRGBA) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 3, p.Rect.Dx()*4 + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i += 4 { + if p.Pix[i] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewNRGBA returns a new NRGBA image with the given bounds. +func NewNRGBA(r Rectangle) *NRGBA { + return &NRGBA{ + Pix: make([]uint8, pixelBufferLength(4, r, "NRGBA")), + Stride: 4 * r.Dx(), + Rect: r, + } +} + +// NRGBA64 is an in-memory image whose At method returns color.NRGBA64 values. +type NRGBA64 struct { + // Pix holds the image's pixels, in R, G, B, A order and big-endian format. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*8]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *NRGBA64) ColorModel() color.Model { return color.NRGBA64Model } + +func (p *NRGBA64) Bounds() Rectangle { return p.Rect } + +func (p *NRGBA64) At(x, y int) color.Color { + return p.NRGBA64At(x, y) +} + +func (p *NRGBA64) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := p.NRGBA64At(x, y).RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func (p *NRGBA64) NRGBA64At(x, y int) color.NRGBA64 { + if !(Point{x, y}.In(p.Rect)) { + return color.NRGBA64{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + return color.NRGBA64{ + uint16(s[0])<<8 | uint16(s[1]), + uint16(s[2])<<8 | uint16(s[3]), + uint16(s[4])<<8 | uint16(s[5]), + uint16(s[6])<<8 | uint16(s[7]), + } +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *NRGBA64) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*8 +} + +func (p *NRGBA64) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.NRGBA64Model.Convert(c).(color.NRGBA64) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(c1.R >> 8) + s[1] = uint8(c1.R) + s[2] = uint8(c1.G >> 8) + s[3] = uint8(c1.G) + s[4] = uint8(c1.B >> 8) + s[5] = uint8(c1.B) + s[6] = uint8(c1.A >> 8) + s[7] = uint8(c1.A) +} + +func (p *NRGBA64) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + r, g, b, a := uint32(c.R), uint32(c.G), uint32(c.B), uint32(c.A) + if (a != 0) && (a != 0xffff) { + r = (r * 0xffff) / a + g = (g * 0xffff) / a + b = (b * 0xffff) / a + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(r >> 8) + s[1] = uint8(r) + s[2] = uint8(g >> 8) + s[3] = uint8(g) + s[4] = uint8(b >> 8) + s[5] = uint8(b) + s[6] = uint8(a >> 8) + s[7] = uint8(a) +} + +func (p *NRGBA64) SetNRGBA64(x, y int, c color.NRGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+8 : i+8] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = uint8(c.R >> 8) + s[1] = uint8(c.R) + s[2] = uint8(c.G >> 8) + s[3] = uint8(c.G) + s[4] = uint8(c.B >> 8) + s[5] = uint8(c.B) + s[6] = uint8(c.A >> 8) + s[7] = uint8(c.A) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *NRGBA64) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &NRGBA64{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &NRGBA64{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *NRGBA64) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 6, p.Rect.Dx()*8 + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i += 8 { + if p.Pix[i+0] != 0xff || p.Pix[i+1] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewNRGBA64 returns a new NRGBA64 image with the given bounds. +func NewNRGBA64(r Rectangle) *NRGBA64 { + return &NRGBA64{ + Pix: make([]uint8, pixelBufferLength(8, r, "NRGBA64")), + Stride: 8 * r.Dx(), + Rect: r, + } +} + +// Alpha is an in-memory image whose At method returns color.Alpha values. +type Alpha struct { + // Pix holds the image's pixels, as alpha values. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*1]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *Alpha) ColorModel() color.Model { return color.AlphaModel } + +func (p *Alpha) Bounds() Rectangle { return p.Rect } + +func (p *Alpha) At(x, y int) color.Color { + return p.AlphaAt(x, y) +} + +func (p *Alpha) RGBA64At(x, y int) color.RGBA64 { + a := uint16(p.AlphaAt(x, y).A) + a |= a << 8 + return color.RGBA64{a, a, a, a} +} + +func (p *Alpha) AlphaAt(x, y int) color.Alpha { + if !(Point{x, y}.In(p.Rect)) { + return color.Alpha{} + } + i := p.PixOffset(x, y) + return color.Alpha{p.Pix[i]} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *Alpha) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*1 +} + +func (p *Alpha) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = color.AlphaModel.Convert(c).(color.Alpha).A +} + +func (p *Alpha) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = uint8(c.A >> 8) +} + +func (p *Alpha) SetAlpha(x, y int, c color.Alpha) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = c.A +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *Alpha) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &Alpha{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &Alpha{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *Alpha) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 0, p.Rect.Dx() + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i++ { + if p.Pix[i] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewAlpha returns a new Alpha image with the given bounds. +func NewAlpha(r Rectangle) *Alpha { + return &Alpha{ + Pix: make([]uint8, pixelBufferLength(1, r, "Alpha")), + Stride: 1 * r.Dx(), + Rect: r, + } +} + +// Alpha16 is an in-memory image whose At method returns color.Alpha16 values. +type Alpha16 struct { + // Pix holds the image's pixels, as alpha values in big-endian format. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*2]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *Alpha16) ColorModel() color.Model { return color.Alpha16Model } + +func (p *Alpha16) Bounds() Rectangle { return p.Rect } + +func (p *Alpha16) At(x, y int) color.Color { + return p.Alpha16At(x, y) +} + +func (p *Alpha16) RGBA64At(x, y int) color.RGBA64 { + a := p.Alpha16At(x, y).A + return color.RGBA64{a, a, a, a} +} + +func (p *Alpha16) Alpha16At(x, y int) color.Alpha16 { + if !(Point{x, y}.In(p.Rect)) { + return color.Alpha16{} + } + i := p.PixOffset(x, y) + return color.Alpha16{uint16(p.Pix[i+0])<<8 | uint16(p.Pix[i+1])} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *Alpha16) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*2 +} + +func (p *Alpha16) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.Alpha16Model.Convert(c).(color.Alpha16) + p.Pix[i+0] = uint8(c1.A >> 8) + p.Pix[i+1] = uint8(c1.A) +} + +func (p *Alpha16) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i+0] = uint8(c.A >> 8) + p.Pix[i+1] = uint8(c.A) +} + +func (p *Alpha16) SetAlpha16(x, y int, c color.Alpha16) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i+0] = uint8(c.A >> 8) + p.Pix[i+1] = uint8(c.A) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *Alpha16) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &Alpha16{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &Alpha16{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *Alpha16) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 0, p.Rect.Dx()*2 + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for i := i0; i < i1; i += 2 { + if p.Pix[i+0] != 0xff || p.Pix[i+1] != 0xff { + return false + } + } + i0 += p.Stride + i1 += p.Stride + } + return true +} + +// NewAlpha16 returns a new Alpha16 image with the given bounds. +func NewAlpha16(r Rectangle) *Alpha16 { + return &Alpha16{ + Pix: make([]uint8, pixelBufferLength(2, r, "Alpha16")), + Stride: 2 * r.Dx(), + Rect: r, + } +} + +// Gray is an in-memory image whose At method returns color.Gray values. +type Gray struct { + // Pix holds the image's pixels, as gray values. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*1]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *Gray) ColorModel() color.Model { return color.GrayModel } + +func (p *Gray) Bounds() Rectangle { return p.Rect } + +func (p *Gray) At(x, y int) color.Color { + return p.GrayAt(x, y) +} + +func (p *Gray) RGBA64At(x, y int) color.RGBA64 { + gray := uint16(p.GrayAt(x, y).Y) + gray |= gray << 8 + return color.RGBA64{gray, gray, gray, 0xffff} +} + +func (p *Gray) GrayAt(x, y int) color.Gray { + if !(Point{x, y}.In(p.Rect)) { + return color.Gray{} + } + i := p.PixOffset(x, y) + return color.Gray{p.Pix[i]} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *Gray) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*1 +} + +func (p *Gray) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = color.GrayModel.Convert(c).(color.Gray).Y +} + +func (p *Gray) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + // This formula is the same as in color.grayModel. + gray := (19595*uint32(c.R) + 38470*uint32(c.G) + 7471*uint32(c.B) + 1<<15) >> 24 + i := p.PixOffset(x, y) + p.Pix[i] = uint8(gray) +} + +func (p *Gray) SetGray(x, y int, c color.Gray) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = c.Y +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *Gray) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &Gray{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &Gray{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *Gray) Opaque() bool { + return true +} + +// NewGray returns a new Gray image with the given bounds. +func NewGray(r Rectangle) *Gray { + return &Gray{ + Pix: make([]uint8, pixelBufferLength(1, r, "Gray")), + Stride: 1 * r.Dx(), + Rect: r, + } +} + +// Gray16 is an in-memory image whose At method returns color.Gray16 values. +type Gray16 struct { + // Pix holds the image's pixels, as gray values in big-endian format. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*2]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *Gray16) ColorModel() color.Model { return color.Gray16Model } + +func (p *Gray16) Bounds() Rectangle { return p.Rect } + +func (p *Gray16) At(x, y int) color.Color { + return p.Gray16At(x, y) +} + +func (p *Gray16) RGBA64At(x, y int) color.RGBA64 { + gray := p.Gray16At(x, y).Y + return color.RGBA64{gray, gray, gray, 0xffff} +} + +func (p *Gray16) Gray16At(x, y int) color.Gray16 { + if !(Point{x, y}.In(p.Rect)) { + return color.Gray16{} + } + i := p.PixOffset(x, y) + return color.Gray16{uint16(p.Pix[i+0])<<8 | uint16(p.Pix[i+1])} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *Gray16) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*2 +} + +func (p *Gray16) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.Gray16Model.Convert(c).(color.Gray16) + p.Pix[i+0] = uint8(c1.Y >> 8) + p.Pix[i+1] = uint8(c1.Y) +} + +func (p *Gray16) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + // This formula is the same as in color.gray16Model. + gray := (19595*uint32(c.R) + 38470*uint32(c.G) + 7471*uint32(c.B) + 1<<15) >> 16 + i := p.PixOffset(x, y) + p.Pix[i+0] = uint8(gray >> 8) + p.Pix[i+1] = uint8(gray) +} + +func (p *Gray16) SetGray16(x, y int, c color.Gray16) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i+0] = uint8(c.Y >> 8) + p.Pix[i+1] = uint8(c.Y) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *Gray16) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &Gray16{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &Gray16{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *Gray16) Opaque() bool { + return true +} + +// NewGray16 returns a new Gray16 image with the given bounds. +func NewGray16(r Rectangle) *Gray16 { + return &Gray16{ + Pix: make([]uint8, pixelBufferLength(2, r, "Gray16")), + Stride: 2 * r.Dx(), + Rect: r, + } +} + +// CMYK is an in-memory image whose At method returns color.CMYK values. +type CMYK struct { + // Pix holds the image's pixels, in C, M, Y, K order. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*4]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle +} + +func (p *CMYK) ColorModel() color.Model { return color.CMYKModel } + +func (p *CMYK) Bounds() Rectangle { return p.Rect } + +func (p *CMYK) At(x, y int) color.Color { + return p.CMYKAt(x, y) +} + +func (p *CMYK) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := p.CMYKAt(x, y).RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func (p *CMYK) CMYKAt(x, y int) color.CMYK { + if !(Point{x, y}.In(p.Rect)) { + return color.CMYK{} + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + return color.CMYK{s[0], s[1], s[2], s[3]} +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *CMYK) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4 +} + +func (p *CMYK) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + c1 := color.CMYKModel.Convert(c).(color.CMYK) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c1.C + s[1] = c1.M + s[2] = c1.Y + s[3] = c1.K +} + +func (p *CMYK) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + cc, mm, yy, kk := color.RGBToCMYK(uint8(c.R>>8), uint8(c.G>>8), uint8(c.B>>8)) + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = cc + s[1] = mm + s[2] = yy + s[3] = kk +} + +func (p *CMYK) SetCMYK(x, y int, c color.CMYK) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857 + s[0] = c.C + s[1] = c.M + s[2] = c.Y + s[3] = c.K +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *CMYK) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &CMYK{} + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &CMYK{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: r, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *CMYK) Opaque() bool { + return true +} + +// NewCMYK returns a new CMYK image with the given bounds. +func NewCMYK(r Rectangle) *CMYK { + return &CMYK{ + Pix: make([]uint8, pixelBufferLength(4, r, "CMYK")), + Stride: 4 * r.Dx(), + Rect: r, + } +} + +// Paletted is an in-memory image of uint8 indices into a given palette. +type Paletted struct { + // Pix holds the image's pixels, as palette indices. The pixel at + // (x, y) starts at Pix[(y-Rect.Min.Y)*Stride + (x-Rect.Min.X)*1]. + Pix []uint8 + // Stride is the Pix stride (in bytes) between vertically adjacent pixels. + Stride int + // Rect is the image's bounds. + Rect Rectangle + // Palette is the image's palette. + Palette color.Palette +} + +func (p *Paletted) ColorModel() color.Model { return p.Palette } + +func (p *Paletted) Bounds() Rectangle { return p.Rect } + +func (p *Paletted) At(x, y int) color.Color { + if len(p.Palette) == 0 { + return nil + } + if !(Point{x, y}.In(p.Rect)) { + return p.Palette[0] + } + i := p.PixOffset(x, y) + return p.Palette[p.Pix[i]] +} + +func (p *Paletted) RGBA64At(x, y int) color.RGBA64 { + if len(p.Palette) == 0 { + return color.RGBA64{} + } + c := color.Color(nil) + if !(Point{x, y}.In(p.Rect)) { + c = p.Palette[0] + } else { + i := p.PixOffset(x, y) + c = p.Palette[p.Pix[i]] + } + r, g, b, a := c.RGBA() + return color.RGBA64{ + uint16(r), + uint16(g), + uint16(b), + uint16(a), + } +} + +// PixOffset returns the index of the first element of Pix that corresponds to +// the pixel at (x, y). +func (p *Paletted) PixOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*1 +} + +func (p *Paletted) Set(x, y int, c color.Color) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = uint8(p.Palette.Index(c)) +} + +func (p *Paletted) SetRGBA64(x, y int, c color.RGBA64) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = uint8(p.Palette.Index(c)) +} + +func (p *Paletted) ColorIndexAt(x, y int) uint8 { + if !(Point{x, y}.In(p.Rect)) { + return 0 + } + i := p.PixOffset(x, y) + return p.Pix[i] +} + +func (p *Paletted) SetColorIndex(x, y int, index uint8) { + if !(Point{x, y}.In(p.Rect)) { + return + } + i := p.PixOffset(x, y) + p.Pix[i] = index +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *Paletted) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &Paletted{ + Palette: p.Palette, + } + } + i := p.PixOffset(r.Min.X, r.Min.Y) + return &Paletted{ + Pix: p.Pix[i:], + Stride: p.Stride, + Rect: p.Rect.Intersect(r), + Palette: p.Palette, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *Paletted) Opaque() bool { + var present [256]bool + i0, i1 := 0, p.Rect.Dx() + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for _, c := range p.Pix[i0:i1] { + present[c] = true + } + i0 += p.Stride + i1 += p.Stride + } + for i, c := range p.Palette { + if !present[i] { + continue + } + _, _, _, a := c.RGBA() + if a != 0xffff { + return false + } + } + return true +} + +// NewPaletted returns a new Paletted image with the given width, height and +// palette. +func NewPaletted(r Rectangle, p color.Palette) *Paletted { + return &Paletted{ + Pix: make([]uint8, pixelBufferLength(1, r, "Paletted")), + Stride: 1 * r.Dx(), + Rect: r, + Palette: p, + } +} diff --git a/src/image/image_test.go b/src/image/image_test.go new file mode 100644 index 0000000..7f41bcb --- /dev/null +++ b/src/image/image_test.go @@ -0,0 +1,458 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "image/color" + "image/color/palette" + "testing" +) + +type image interface { + Image + Opaque() bool + Set(int, int, color.Color) + SubImage(Rectangle) Image +} + +func cmp(cm color.Model, c0, c1 color.Color) bool { + r0, g0, b0, a0 := cm.Convert(c0).RGBA() + r1, g1, b1, a1 := cm.Convert(c1).RGBA() + return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1 +} + +var testImages = []struct { + name string + image func() image +}{ + {"rgba", func() image { return NewRGBA(Rect(0, 0, 10, 10)) }}, + {"rgba64", func() image { return NewRGBA64(Rect(0, 0, 10, 10)) }}, + {"nrgba", func() image { return NewNRGBA(Rect(0, 0, 10, 10)) }}, + {"nrgba64", func() image { return NewNRGBA64(Rect(0, 0, 10, 10)) }}, + {"alpha", func() image { return NewAlpha(Rect(0, 0, 10, 10)) }}, + {"alpha16", func() image { return NewAlpha16(Rect(0, 0, 10, 10)) }}, + {"gray", func() image { return NewGray(Rect(0, 0, 10, 10)) }}, + {"gray16", func() image { return NewGray16(Rect(0, 0, 10, 10)) }}, + {"paletted", func() image { + return NewPaletted(Rect(0, 0, 10, 10), color.Palette{ + Transparent, + Opaque, + }) + }}, +} + +func TestImage(t *testing.T) { + for _, tc := range testImages { + m := tc.image() + if !Rect(0, 0, 10, 10).Eq(m.Bounds()) { + t.Errorf("%T: want bounds %v, got %v", m, Rect(0, 0, 10, 10), m.Bounds()) + continue + } + if !cmp(m.ColorModel(), Transparent, m.At(6, 3)) { + t.Errorf("%T: at (6, 3), want a zero color, got %v", m, m.At(6, 3)) + continue + } + m.Set(6, 3, Opaque) + if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) { + t.Errorf("%T: at (6, 3), want a non-zero color, got %v", m, m.At(6, 3)) + continue + } + if !m.SubImage(Rect(6, 3, 7, 4)).(image).Opaque() { + t.Errorf("%T: at (6, 3) was not opaque", m) + continue + } + m = m.SubImage(Rect(3, 2, 9, 8)).(image) + if !Rect(3, 2, 9, 8).Eq(m.Bounds()) { + t.Errorf("%T: sub-image want bounds %v, got %v", m, Rect(3, 2, 9, 8), m.Bounds()) + continue + } + if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) { + t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", m, m.At(6, 3)) + continue + } + if !cmp(m.ColorModel(), Transparent, m.At(3, 3)) { + t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", m, m.At(3, 3)) + continue + } + m.Set(3, 3, Opaque) + if !cmp(m.ColorModel(), Opaque, m.At(3, 3)) { + t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", m, m.At(3, 3)) + continue + } + // Test that taking an empty sub-image starting at a corner does not panic. + m.SubImage(Rect(0, 0, 0, 0)) + m.SubImage(Rect(10, 0, 10, 0)) + m.SubImage(Rect(0, 10, 0, 10)) + m.SubImage(Rect(10, 10, 10, 10)) + } +} + +func TestNewXxxBadRectangle(t *testing.T) { + // call calls f(r) and reports whether it ran without panicking. + call := func(f func(Rectangle), r Rectangle) (ok bool) { + defer func() { + if recover() != nil { + ok = false + } + }() + f(r) + return true + } + + testCases := []struct { + name string + f func(Rectangle) + }{ + {"RGBA", func(r Rectangle) { NewRGBA(r) }}, + {"RGBA64", func(r Rectangle) { NewRGBA64(r) }}, + {"NRGBA", func(r Rectangle) { NewNRGBA(r) }}, + {"NRGBA64", func(r Rectangle) { NewNRGBA64(r) }}, + {"Alpha", func(r Rectangle) { NewAlpha(r) }}, + {"Alpha16", func(r Rectangle) { NewAlpha16(r) }}, + {"Gray", func(r Rectangle) { NewGray(r) }}, + {"Gray16", func(r Rectangle) { NewGray16(r) }}, + {"CMYK", func(r Rectangle) { NewCMYK(r) }}, + {"Paletted", func(r Rectangle) { NewPaletted(r, color.Palette{color.Black, color.White}) }}, + {"YCbCr", func(r Rectangle) { NewYCbCr(r, YCbCrSubsampleRatio422) }}, + {"NYCbCrA", func(r Rectangle) { NewNYCbCrA(r, YCbCrSubsampleRatio444) }}, + } + + for _, tc := range testCases { + // Calling NewXxx(r) should fail (panic, since NewXxx doesn't return an + // error) unless r's width and height are both non-negative. + for _, negDx := range []bool{false, true} { + for _, negDy := range []bool{false, true} { + r := Rectangle{ + Min: Point{15, 28}, + Max: Point{16, 29}, + } + if negDx { + r.Max.X = 14 + } + if negDy { + r.Max.Y = 27 + } + + got := call(tc.f, r) + want := !negDx && !negDy + if got != want { + t.Errorf("New%s: negDx=%t, negDy=%t: got %t, want %t", + tc.name, negDx, negDy, got, want) + } + } + } + + // Passing a Rectangle whose width and height is MaxInt should also fail + // (panic), due to overflow. + { + zeroAsUint := uint(0) + maxUint := zeroAsUint - 1 + maxInt := int(maxUint / 2) + got := call(tc.f, Rectangle{ + Min: Point{0, 0}, + Max: Point{maxInt, maxInt}, + }) + if got { + t.Errorf("New%s: overflow: got ok, want !ok", tc.name) + } + } + } +} + +func Test16BitsPerColorChannel(t *testing.T) { + testColorModel := []color.Model{ + color.RGBA64Model, + color.NRGBA64Model, + color.Alpha16Model, + color.Gray16Model, + } + for _, cm := range testColorModel { + c := cm.Convert(color.RGBA64{0x1234, 0x1234, 0x1234, 0x1234}) // Premultiplied alpha. + r, _, _, _ := c.RGBA() + if r != 0x1234 { + t.Errorf("%T: want red value 0x%04x got 0x%04x", c, 0x1234, r) + continue + } + } + testImage := []image{ + NewRGBA64(Rect(0, 0, 10, 10)), + NewNRGBA64(Rect(0, 0, 10, 10)), + NewAlpha16(Rect(0, 0, 10, 10)), + NewGray16(Rect(0, 0, 10, 10)), + } + for _, m := range testImage { + m.Set(1, 2, color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}) // Non-premultiplied alpha. + r, _, _, _ := m.At(1, 2).RGBA() + if r != 0x1357 { + t.Errorf("%T: want red value 0x%04x got 0x%04x", m, 0x1357, r) + continue + } + } +} + +func TestRGBA64Image(t *testing.T) { + // memset sets every element of s to v. + memset := func(s []byte, v byte) { + for i := range s { + s[i] = v + } + } + + r := Rect(0, 0, 3, 2) + testCases := []Image{ + NewAlpha(r), + NewAlpha16(r), + NewCMYK(r), + NewGray(r), + NewGray16(r), + NewNRGBA(r), + NewNRGBA64(r), + NewNYCbCrA(r, YCbCrSubsampleRatio444), + NewPaletted(r, palette.Plan9), + NewRGBA(r), + NewRGBA64(r), + NewUniform(color.RGBA64{}), + NewYCbCr(r, YCbCrSubsampleRatio444), + r, + } + for _, tc := range testCases { + switch tc := tc.(type) { + // Most of the concrete image types in the testCases implement the + // draw.RGBA64Image interface: they have a SetRGBA64 method. We use an + // interface literal here, instead of importing "image/draw", to avoid + // an import cycle. + // + // The YCbCr and NYCbCrA types are special-cased. Chroma subsampling + // means that setting one pixel can modify neighboring pixels. They + // don't have Set or SetRGBA64 methods because that side effect could + // be surprising. Here, we just memset the channel buffers instead. + // + // The Uniform and Rectangle types are also special-cased, as they + // don't have a Set or SetRGBA64 method. + case interface { + SetRGBA64(x, y int, c color.RGBA64) + }: + tc.SetRGBA64(1, 1, color.RGBA64{0x7FFF, 0x3FFF, 0x0000, 0x7FFF}) + + case *NYCbCrA: + memset(tc.YCbCr.Y, 0x77) + memset(tc.YCbCr.Cb, 0x88) + memset(tc.YCbCr.Cr, 0x99) + memset(tc.A, 0xAA) + + case *Uniform: + tc.C = color.RGBA64{0x7FFF, 0x3FFF, 0x0000, 0x7FFF} + + case *YCbCr: + memset(tc.Y, 0x77) + memset(tc.Cb, 0x88) + memset(tc.Cr, 0x99) + + case Rectangle: + // No-op. Rectangle pixels' colors are immutable. They're always + // color.Opaque. + + default: + t.Errorf("could not initialize pixels for %T", tc) + continue + } + + // Check that RGBA64At(x, y) is equivalent to At(x, y).RGBA(). + rgba64Image, ok := tc.(RGBA64Image) + if !ok { + t.Errorf("%T is not an RGBA64Image", tc) + continue + } + got := rgba64Image.RGBA64At(1, 1) + wantR, wantG, wantB, wantA := tc.At(1, 1).RGBA() + if (uint32(got.R) != wantR) || (uint32(got.G) != wantG) || + (uint32(got.B) != wantB) || (uint32(got.A) != wantA) { + t.Errorf("%T:\ngot (0x%04X, 0x%04X, 0x%04X, 0x%04X)\n"+ + "want (0x%04X, 0x%04X, 0x%04X, 0x%04X)", tc, + got.R, got.G, got.B, got.A, + wantR, wantG, wantB, wantA) + continue + } + } +} + +func BenchmarkAt(b *testing.B) { + for _, tc := range testImages { + b.Run(tc.name, func(b *testing.B) { + m := tc.image() + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + m.At(4, 5) + } + }) + } +} + +func BenchmarkSet(b *testing.B) { + c := color.Gray{0xff} + for _, tc := range testImages { + b.Run(tc.name, func(b *testing.B) { + m := tc.image() + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + m.Set(4, 5, c) + } + }) + } +} + +func BenchmarkRGBAAt(b *testing.B) { + m := NewRGBA(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.RGBAAt(4, 5) + } +} + +func BenchmarkRGBASetRGBA(b *testing.B) { + m := NewRGBA(Rect(0, 0, 10, 10)) + c := color.RGBA{0xff, 0xff, 0xff, 0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetRGBA(4, 5, c) + } +} + +func BenchmarkRGBA64At(b *testing.B) { + m := NewRGBA64(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.RGBA64At(4, 5) + } +} + +func BenchmarkRGBA64SetRGBA64(b *testing.B) { + m := NewRGBA64(Rect(0, 0, 10, 10)) + c := color.RGBA64{0xffff, 0xffff, 0xffff, 0x1357} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetRGBA64(4, 5, c) + } +} + +func BenchmarkNRGBAAt(b *testing.B) { + m := NewNRGBA(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.NRGBAAt(4, 5) + } +} + +func BenchmarkNRGBASetNRGBA(b *testing.B) { + m := NewNRGBA(Rect(0, 0, 10, 10)) + c := color.NRGBA{0xff, 0xff, 0xff, 0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetNRGBA(4, 5, c) + } +} + +func BenchmarkNRGBA64At(b *testing.B) { + m := NewNRGBA64(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.NRGBA64At(4, 5) + } +} + +func BenchmarkNRGBA64SetNRGBA64(b *testing.B) { + m := NewNRGBA64(Rect(0, 0, 10, 10)) + c := color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetNRGBA64(4, 5, c) + } +} + +func BenchmarkAlphaAt(b *testing.B) { + m := NewAlpha(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.AlphaAt(4, 5) + } +} + +func BenchmarkAlphaSetAlpha(b *testing.B) { + m := NewAlpha(Rect(0, 0, 10, 10)) + c := color.Alpha{0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetAlpha(4, 5, c) + } +} + +func BenchmarkAlpha16At(b *testing.B) { + m := NewAlpha16(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.Alpha16At(4, 5) + } +} + +func BenchmarkAlphaSetAlpha16(b *testing.B) { + m := NewAlpha16(Rect(0, 0, 10, 10)) + c := color.Alpha16{0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetAlpha16(4, 5, c) + } +} + +func BenchmarkGrayAt(b *testing.B) { + m := NewGray(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.GrayAt(4, 5) + } +} + +func BenchmarkGraySetGray(b *testing.B) { + m := NewGray(Rect(0, 0, 10, 10)) + c := color.Gray{0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetGray(4, 5, c) + } +} + +func BenchmarkGray16At(b *testing.B) { + m := NewGray16(Rect(0, 0, 10, 10)) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.Gray16At(4, 5) + } +} + +func BenchmarkGraySetGray16(b *testing.B) { + m := NewGray16(Rect(0, 0, 10, 10)) + c := color.Gray16{0x13} + b.ResetTimer() + + for i := 0; i < b.N; i++ { + m.SetGray16(4, 5, c) + } +} diff --git a/src/image/internal/imageutil/gen.go b/src/image/internal/imageutil/gen.go new file mode 100644 index 0000000..38f4130 --- /dev/null +++ b/src/image/internal/imageutil/gen.go @@ -0,0 +1,173 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:build ignore +// +build ignore + +package main + +import ( + "bytes" + "flag" + "fmt" + "go/format" + "log" + "os" +) + +var debug = flag.Bool("debug", false, "") + +func main() { + flag.Parse() + + w := new(bytes.Buffer) + w.WriteString(pre) + for _, sratio := range subsampleRatios { + fmt.Fprintf(w, sratioCase, sratio, sratioLines[sratio]) + } + w.WriteString(post) + + if *debug { + os.Stdout.Write(w.Bytes()) + return + } + out, err := format.Source(w.Bytes()) + if err != nil { + log.Fatal(err) + } + if err := os.WriteFile("impl.go", out, 0660); err != nil { + log.Fatal(err) + } +} + +const pre = `// Code generated by go run gen.go; DO NOT EDIT. + +package imageutil + +import ( + "image" +) + +// DrawYCbCr draws the YCbCr source image on the RGBA destination image with +// r.Min in dst aligned with sp in src. It reports whether the draw was +// successful. If it returns false, no dst pixels were changed. +// +// This function assumes that r is entirely within dst's bounds and the +// translation of r from dst coordinate space to src coordinate space is +// entirely within src's bounds. +func DrawYCbCr(dst *image.RGBA, r image.Rectangle, src *image.YCbCr, sp image.Point) (ok bool) { + // This function exists in the image/internal/imageutil package because it + // is needed by both the image/draw and image/jpeg packages, but it doesn't + // seem right for one of those two to depend on the other. + // + // Another option is to have this code be exported in the image package, + // but we'd need to make sure we're totally happy with the API (for the + // rest of Go 1 compatibility), and decide if we want to have a more + // general purpose DrawToRGBA method for other image types. One possibility + // is: + // + // func (src *YCbCr) CopyToRGBA(dst *RGBA, dr, sr Rectangle) (effectiveDr, effectiveSr Rectangle) + // + // in the spirit of the built-in copy function for 1-dimensional slices, + // that also allowed a CopyFromRGBA method if needed. + + x0 := (r.Min.X - dst.Rect.Min.X) * 4 + x1 := (r.Max.X - dst.Rect.Min.X) * 4 + y0 := r.Min.Y - dst.Rect.Min.Y + y1 := r.Max.Y - dst.Rect.Min.Y + switch src.SubsampleRatio { +` + +const post = ` + default: + return false + } + return true +} +` + +const sratioCase = ` + case image.YCbCrSubsampleRatio%s: + for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X) + %s + + // This is an inline version of image/color/ycbcr.go's func YCbCrToRGB. + yy1 := int32(src.Y[yi]) * 0x10101 + cb1 := int32(src.Cb[ci]) - 128 + cr1 := int32(src.Cr[ci]) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + + // use a temp slice to hint to the compiler that a single bounds check suffices + rgba := dpix[x : x+4 : len(dpix)] + rgba[0] = uint8(r) + rgba[1] = uint8(g) + rgba[2] = uint8(b) + rgba[3] = 255 + } + } +` + +var subsampleRatios = []string{ + "444", + "422", + "420", + "440", +} + +var sratioLines = map[string]string{ + "444": ` + ci := (sy-src.Rect.Min.Y)*src.CStride + (sp.X - src.Rect.Min.X) + for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 { + `, + "422": ` + ciBase := (sy-src.Rect.Min.Y)*src.CStride - src.Rect.Min.X/2 + for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 { + ci := ciBase + sx/2 + `, + "420": ` + ciBase := (sy/2-src.Rect.Min.Y/2)*src.CStride - src.Rect.Min.X/2 + for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 { + ci := ciBase + sx/2 + `, + "440": ` + ci := (sy/2-src.Rect.Min.Y/2)*src.CStride + (sp.X - src.Rect.Min.X) + for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 { + `, +} diff --git a/src/image/internal/imageutil/imageutil.go b/src/image/internal/imageutil/imageutil.go new file mode 100644 index 0000000..10cef0c --- /dev/null +++ b/src/image/internal/imageutil/imageutil.go @@ -0,0 +1,8 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:generate go run gen.go + +// Package imageutil contains code shared by image-related packages. +package imageutil diff --git a/src/image/internal/imageutil/impl.go b/src/image/internal/imageutil/impl.go new file mode 100644 index 0000000..4581dd8 --- /dev/null +++ b/src/image/internal/imageutil/impl.go @@ -0,0 +1,268 @@ +// Code generated by go run gen.go; DO NOT EDIT. + +package imageutil + +import ( + "image" +) + +// DrawYCbCr draws the YCbCr source image on the RGBA destination image with +// r.Min in dst aligned with sp in src. It reports whether the draw was +// successful. If it returns false, no dst pixels were changed. +// +// This function assumes that r is entirely within dst's bounds and the +// translation of r from dst coordinate space to src coordinate space is +// entirely within src's bounds. +func DrawYCbCr(dst *image.RGBA, r image.Rectangle, src *image.YCbCr, sp image.Point) (ok bool) { + // This function exists in the image/internal/imageutil package because it + // is needed by both the image/draw and image/jpeg packages, but it doesn't + // seem right for one of those two to depend on the other. + // + // Another option is to have this code be exported in the image package, + // but we'd need to make sure we're totally happy with the API (for the + // rest of Go 1 compatibility), and decide if we want to have a more + // general purpose DrawToRGBA method for other image types. One possibility + // is: + // + // func (src *YCbCr) CopyToRGBA(dst *RGBA, dr, sr Rectangle) (effectiveDr, effectiveSr Rectangle) + // + // in the spirit of the built-in copy function for 1-dimensional slices, + // that also allowed a CopyFromRGBA method if needed. + + x0 := (r.Min.X - dst.Rect.Min.X) * 4 + x1 := (r.Max.X - dst.Rect.Min.X) * 4 + y0 := r.Min.Y - dst.Rect.Min.Y + y1 := r.Max.Y - dst.Rect.Min.Y + switch src.SubsampleRatio { + + case image.YCbCrSubsampleRatio444: + for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X) + + ci := (sy-src.Rect.Min.Y)*src.CStride + (sp.X - src.Rect.Min.X) + for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 { + + // This is an inline version of image/color/ycbcr.go's func YCbCrToRGB. + yy1 := int32(src.Y[yi]) * 0x10101 + cb1 := int32(src.Cb[ci]) - 128 + cr1 := int32(src.Cr[ci]) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + // use a temp slice to hint to the compiler that a single bounds check suffices + rgba := dpix[x : x+4 : len(dpix)] + rgba[0] = uint8(r) + rgba[1] = uint8(g) + rgba[2] = uint8(b) + rgba[3] = 255 + } + } + + case image.YCbCrSubsampleRatio422: + for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X) + + ciBase := (sy-src.Rect.Min.Y)*src.CStride - src.Rect.Min.X/2 + for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 { + ci := ciBase + sx/2 + + // This is an inline version of image/color/ycbcr.go's func YCbCrToRGB. + yy1 := int32(src.Y[yi]) * 0x10101 + cb1 := int32(src.Cb[ci]) - 128 + cr1 := int32(src.Cr[ci]) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + // use a temp slice to hint to the compiler that a single bounds check suffices + rgba := dpix[x : x+4 : len(dpix)] + rgba[0] = uint8(r) + rgba[1] = uint8(g) + rgba[2] = uint8(b) + rgba[3] = 255 + } + } + + case image.YCbCrSubsampleRatio420: + for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X) + + ciBase := (sy/2-src.Rect.Min.Y/2)*src.CStride - src.Rect.Min.X/2 + for x, sx := x0, sp.X; x != x1; x, sx, yi = x+4, sx+1, yi+1 { + ci := ciBase + sx/2 + + // This is an inline version of image/color/ycbcr.go's func YCbCrToRGB. + yy1 := int32(src.Y[yi]) * 0x10101 + cb1 := int32(src.Cb[ci]) - 128 + cr1 := int32(src.Cr[ci]) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + // use a temp slice to hint to the compiler that a single bounds check suffices + rgba := dpix[x : x+4 : len(dpix)] + rgba[0] = uint8(r) + rgba[1] = uint8(g) + rgba[2] = uint8(b) + rgba[3] = 255 + } + } + + case image.YCbCrSubsampleRatio440: + for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 { + dpix := dst.Pix[y*dst.Stride:] + yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X) + + ci := (sy/2-src.Rect.Min.Y/2)*src.CStride + (sp.X - src.Rect.Min.X) + for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 { + + // This is an inline version of image/color/ycbcr.go's func YCbCrToRGB. + yy1 := int32(src.Y[yi]) * 0x10101 + cb1 := int32(src.Cb[ci]) - 128 + cr1 := int32(src.Cr[ci]) - 128 + + // The bit twiddling below is equivalent to + // + // r := (yy1 + 91881*cr1) >> 16 + // if r < 0 { + // r = 0 + // } else if r > 0xff { + // r = ^int32(0) + // } + // + // but uses fewer branches and is faster. + // Note that the uint8 type conversion in the return + // statement will convert ^int32(0) to 0xff. + // The code below to compute g and b uses a similar pattern. + r := yy1 + 91881*cr1 + if uint32(r)&0xff000000 == 0 { + r >>= 16 + } else { + r = ^(r >> 31) + } + + g := yy1 - 22554*cb1 - 46802*cr1 + if uint32(g)&0xff000000 == 0 { + g >>= 16 + } else { + g = ^(g >> 31) + } + + b := yy1 + 116130*cb1 + if uint32(b)&0xff000000 == 0 { + b >>= 16 + } else { + b = ^(b >> 31) + } + + // use a temp slice to hint to the compiler that a single bounds check suffices + rgba := dpix[x : x+4 : len(dpix)] + rgba[0] = uint8(r) + rgba[1] = uint8(g) + rgba[2] = uint8(b) + rgba[3] = 255 + } + } + + default: + return false + } + return true +} diff --git a/src/image/jpeg/dct_test.go b/src/image/jpeg/dct_test.go new file mode 100644 index 0000000..845e758 --- /dev/null +++ b/src/image/jpeg/dct_test.go @@ -0,0 +1,299 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "bytes" + "fmt" + "math" + "math/rand" + "testing" +) + +func benchmarkDCT(b *testing.B, f func(*block)) { + b.StopTimer() + blocks := make([]block, 0, b.N*len(testBlocks)) + for i := 0; i < b.N; i++ { + blocks = append(blocks, testBlocks[:]...) + } + b.StartTimer() + for i := range blocks { + f(&blocks[i]) + } +} + +func BenchmarkFDCT(b *testing.B) { + benchmarkDCT(b, fdct) +} + +func BenchmarkIDCT(b *testing.B) { + benchmarkDCT(b, idct) +} + +func TestDCT(t *testing.T) { + blocks := make([]block, len(testBlocks)) + copy(blocks, testBlocks[:]) + + // Append some randomly generated blocks of varying sparseness. + r := rand.New(rand.NewSource(123)) + for i := 0; i < 100; i++ { + b := block{} + n := r.Int() % 64 + for j := 0; j < n; j++ { + b[r.Int()%len(b)] = r.Int31() % 256 + } + blocks = append(blocks, b) + } + + // Check that the FDCT and IDCT functions are inverses, after a scale and + // level shift. Scaling reduces the rounding errors in the conversion from + // floats to ints. + for i, b := range blocks { + got, want := b, b + for j := range got { + got[j] = (got[j] - 128) * 8 + } + slowFDCT(&got) + slowIDCT(&got) + for j := range got { + got[j] = got[j]/8 + 128 + } + if differ(&got, &want) { + t.Errorf("i=%d: IDCT(FDCT)\nsrc\n%s\ngot\n%s\nwant\n%s\n", i, &b, &got, &want) + } + } + + // Check that the optimized and slow FDCT implementations agree. + // The fdct function already does a scale and level shift. + for i, b := range blocks { + got, want := b, b + fdct(&got) + for j := range want { + want[j] = (want[j] - 128) * 8 + } + slowFDCT(&want) + if differ(&got, &want) { + t.Errorf("i=%d: FDCT\nsrc\n%s\ngot\n%s\nwant\n%s\n", i, &b, &got, &want) + } + } + + // Check that the optimized and slow IDCT implementations agree. + for i, b := range blocks { + got, want := b, b + idct(&got) + slowIDCT(&want) + if differ(&got, &want) { + t.Errorf("i=%d: IDCT\nsrc\n%s\ngot\n%s\nwant\n%s\n", i, &b, &got, &want) + } + } +} + +// differ reports whether any pair-wise elements in b0 and b1 differ by 2 or +// more. That tolerance is because there isn't a single definitive decoding of +// a given JPEG image, even before the YCbCr to RGB conversion; implementations +// can have different IDCT rounding errors. +func differ(b0, b1 *block) bool { + for i := range b0 { + delta := b0[i] - b1[i] + if delta < -2 || +2 < delta { + return true + } + } + return false +} + +// alpha returns 1 if i is 0 and returns √2 otherwise. +func alpha(i int) float64 { + if i == 0 { + return 1 + } + return math.Sqrt2 +} + +var cosines [32]float64 // cosines[k] = cos(π/2 * k/8) + +func init() { + for k := range cosines { + cosines[k] = math.Cos(math.Pi * float64(k) / 16) + } +} + +// slowFDCT performs the 8*8 2-dimensional forward discrete cosine transform: +// +// dst[u,v] = (1/8) * Σ_x Σ_y alpha(u) * alpha(v) * src[x,y] * +// cos((π/2) * (2*x + 1) * u / 8) * +// cos((π/2) * (2*y + 1) * v / 8) +// +// x and y are in pixel space, and u and v are in transform space. +// +// b acts as both dst and src. +func slowFDCT(b *block) { + var dst [blockSize]float64 + for v := 0; v < 8; v++ { + for u := 0; u < 8; u++ { + sum := 0.0 + for y := 0; y < 8; y++ { + for x := 0; x < 8; x++ { + sum += alpha(u) * alpha(v) * float64(b[8*y+x]) * + cosines[((2*x+1)*u)%32] * + cosines[((2*y+1)*v)%32] + } + } + dst[8*v+u] = sum / 8 + } + } + // Convert from float64 to int32. + for i := range dst { + b[i] = int32(dst[i] + 0.5) + } +} + +// slowIDCT performs the 8*8 2-dimensional inverse discrete cosine transform: +// +// dst[x,y] = (1/8) * Σ_u Σ_v alpha(u) * alpha(v) * src[u,v] * +// cos((π/2) * (2*x + 1) * u / 8) * +// cos((π/2) * (2*y + 1) * v / 8) +// +// x and y are in pixel space, and u and v are in transform space. +// +// b acts as both dst and src. +func slowIDCT(b *block) { + var dst [blockSize]float64 + for y := 0; y < 8; y++ { + for x := 0; x < 8; x++ { + sum := 0.0 + for v := 0; v < 8; v++ { + for u := 0; u < 8; u++ { + sum += alpha(u) * alpha(v) * float64(b[8*v+u]) * + cosines[((2*x+1)*u)%32] * + cosines[((2*y+1)*v)%32] + } + } + dst[8*y+x] = sum / 8 + } + } + // Convert from float64 to int32. + for i := range dst { + b[i] = int32(dst[i] + 0.5) + } +} + +func (b *block) String() string { + s := bytes.NewBuffer(nil) + fmt.Fprintf(s, "{\n") + for y := 0; y < 8; y++ { + fmt.Fprintf(s, "\t") + for x := 0; x < 8; x++ { + fmt.Fprintf(s, "0x%04x, ", uint16(b[8*y+x])) + } + fmt.Fprintln(s) + } + fmt.Fprintf(s, "}") + return s.String() +} + +// testBlocks are the first 10 pre-IDCT blocks from ../testdata/video-001.jpeg. +var testBlocks = [10]block{ + { + 0x7f, 0xf6, 0x01, 0x07, 0xff, 0x00, 0x00, 0x00, + 0xf5, 0x01, 0xfa, 0x01, 0xfe, 0x00, 0x01, 0x00, + 0x05, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0xff, 0xf8, 0x00, 0x01, 0xff, 0x00, 0x00, + 0x00, 0x01, 0x00, 0x01, 0x00, 0xff, 0xff, 0x00, + 0xff, 0x0c, 0x00, 0x00, 0x00, 0x00, 0xff, 0x01, + 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x01, 0xff, 0x01, 0x00, 0xfe, + }, + { + 0x29, 0x07, 0x00, 0xfc, 0x01, 0x01, 0x00, 0x00, + 0x07, 0x00, 0x03, 0x00, 0x01, 0x00, 0xff, 0xff, + 0xff, 0xfd, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x04, 0x00, 0xff, 0x01, 0x00, 0x00, + 0x01, 0x00, 0x01, 0xff, 0x00, 0x00, 0x00, 0x00, + 0x01, 0xfa, 0x01, 0x00, 0x01, 0x00, 0x01, 0xff, + 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0xff, 0x00, 0xff, 0x00, 0x02, + }, + { + 0xc5, 0xfa, 0x01, 0x00, 0x00, 0x01, 0x00, 0xff, + 0x02, 0xff, 0x01, 0x00, 0x01, 0x00, 0xff, 0x00, + 0xff, 0xff, 0x00, 0xff, 0x01, 0x00, 0x00, 0x00, + 0xff, 0x00, 0x01, 0x00, 0x00, 0x00, 0xff, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, + 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }, + { + 0x86, 0x05, 0x00, 0x02, 0x00, 0x00, 0x01, 0x00, + 0xf2, 0x06, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, + 0xf6, 0xfa, 0xf9, 0x00, 0xff, 0x01, 0x00, 0x00, + 0xf9, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, + 0x00, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, + 0xff, 0x00, 0x00, 0x01, 0x00, 0xff, 0x01, 0x00, + 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x01, + 0x00, 0x01, 0xff, 0x01, 0x00, 0xff, 0x00, 0x00, + }, + { + 0x24, 0xfe, 0x00, 0xff, 0x00, 0xff, 0xff, 0x00, + 0x08, 0xfd, 0x00, 0x01, 0x01, 0x00, 0x01, 0x00, + 0x06, 0x03, 0x03, 0xff, 0x00, 0x00, 0x00, 0x00, + 0x04, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, + 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x01, + 0x01, 0x00, 0x01, 0xff, 0x00, 0x01, 0x00, 0x00, + 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0xff, 0x01, + }, + { + 0xcd, 0xff, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, + 0x03, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, + 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, + 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0xff, + }, + { + 0x81, 0xfe, 0x05, 0xff, 0x01, 0xff, 0x01, 0x00, + 0xef, 0xf9, 0x00, 0xf9, 0x00, 0xff, 0x00, 0xff, + 0x05, 0xf9, 0x00, 0xf8, 0x01, 0xff, 0x01, 0xff, + 0x00, 0xff, 0x07, 0x00, 0x01, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x01, + 0xff, 0x01, 0x01, 0x00, 0xff, 0x00, 0x00, 0x00, + 0x01, 0x01, 0x00, 0xff, 0x00, 0x00, 0x00, 0xff, + }, + { + 0x28, 0x00, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x0b, 0x02, 0x01, 0x03, 0x00, 0xff, 0x00, 0x01, + 0xfe, 0x02, 0x01, 0x03, 0xff, 0x00, 0x00, 0x00, + 0x01, 0x00, 0xfd, 0x00, 0x01, 0x00, 0xff, 0x00, + 0x01, 0xff, 0x00, 0xff, 0x01, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0xff, 0x01, 0x01, 0x00, 0xff, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xff, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x01, + }, + { + 0xdf, 0xf9, 0xfe, 0x00, 0x03, 0x01, 0xff, 0xff, + 0x04, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0xff, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x01, + 0x00, 0x00, 0xfe, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0xff, 0x01, 0x00, 0x00, 0x00, 0x01, + 0xff, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, + 0x00, 0xff, 0x00, 0xff, 0x01, 0x00, 0x00, 0x01, + 0xff, 0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, + }, + { + 0x88, 0xfd, 0x00, 0x00, 0xff, 0x00, 0x01, 0xff, + 0xe1, 0x06, 0x06, 0x01, 0xff, 0x00, 0x01, 0x00, + 0x08, 0x00, 0xfa, 0x00, 0xff, 0xff, 0xff, 0xff, + 0x08, 0x01, 0x00, 0xff, 0x01, 0xff, 0x00, 0x00, + 0xf5, 0xff, 0x00, 0x01, 0xff, 0x01, 0x01, 0x00, + 0xff, 0xff, 0x01, 0xff, 0x01, 0x00, 0x01, 0x00, + 0x00, 0x01, 0x01, 0xff, 0x00, 0xff, 0x00, 0x01, + 0x02, 0x00, 0x00, 0xff, 0xff, 0x00, 0xff, 0x00, + }, +} diff --git a/src/image/jpeg/fdct.go b/src/image/jpeg/fdct.go new file mode 100644 index 0000000..c7a973e --- /dev/null +++ b/src/image/jpeg/fdct.go @@ -0,0 +1,192 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +// This file implements a Forward Discrete Cosine Transformation. + +/* +It is based on the code in jfdctint.c from the Independent JPEG Group, +found at http://www.ijg.org/files/jpegsrc.v8c.tar.gz. + +The "LEGAL ISSUES" section of the README in that archive says: + +In plain English: + +1. We don't promise that this software works. (But if you find any bugs, + please let us know!) +2. You can use this software for whatever you want. You don't have to pay us. +3. You may not pretend that you wrote this software. If you use it in a + program, you must acknowledge somewhere in your documentation that + you've used the IJG code. + +In legalese: + +The authors make NO WARRANTY or representation, either express or implied, +with respect to this software, its quality, accuracy, merchantability, or +fitness for a particular purpose. This software is provided "AS IS", and you, +its user, assume the entire risk as to its quality and accuracy. + +This software is copyright (C) 1991-2011, Thomas G. Lane, Guido Vollbeding. +All Rights Reserved except as specified below. + +Permission is hereby granted to use, copy, modify, and distribute this +software (or portions thereof) for any purpose, without fee, subject to these +conditions: +(1) If any part of the source code for this software is distributed, then this +README file must be included, with this copyright and no-warranty notice +unaltered; and any additions, deletions, or changes to the original files +must be clearly indicated in accompanying documentation. +(2) If only executable code is distributed, then the accompanying +documentation must state that "this software is based in part on the work of +the Independent JPEG Group". +(3) Permission for use of this software is granted only if the user accepts +full responsibility for any undesirable consequences; the authors accept +NO LIABILITY for damages of any kind. + +These conditions apply to any software derived from or based on the IJG code, +not just to the unmodified library. If you use our work, you ought to +acknowledge us. + +Permission is NOT granted for the use of any IJG author's name or company name +in advertising or publicity relating to this software or products derived from +it. This software may be referred to only as "the Independent JPEG Group's +software". + +We specifically permit and encourage the use of this software as the basis of +commercial products, provided that all warranty or liability claims are +assumed by the product vendor. +*/ + +// Trigonometric constants in 13-bit fixed point format. +const ( + fix_0_298631336 = 2446 + fix_0_390180644 = 3196 + fix_0_541196100 = 4433 + fix_0_765366865 = 6270 + fix_0_899976223 = 7373 + fix_1_175875602 = 9633 + fix_1_501321110 = 12299 + fix_1_847759065 = 15137 + fix_1_961570560 = 16069 + fix_2_053119869 = 16819 + fix_2_562915447 = 20995 + fix_3_072711026 = 25172 +) + +const ( + constBits = 13 + pass1Bits = 2 + centerJSample = 128 +) + +// fdct performs a forward DCT on an 8x8 block of coefficients, including a +// level shift. +func fdct(b *block) { + // Pass 1: process rows. + for y := 0; y < 8; y++ { + y8 := y * 8 + s := b[y8 : y8+8 : y8+8] // Small cap improves performance, see https://golang.org/issue/27857 + x0 := s[0] + x1 := s[1] + x2 := s[2] + x3 := s[3] + x4 := s[4] + x5 := s[5] + x6 := s[6] + x7 := s[7] + + tmp0 := x0 + x7 + tmp1 := x1 + x6 + tmp2 := x2 + x5 + tmp3 := x3 + x4 + + tmp10 := tmp0 + tmp3 + tmp12 := tmp0 - tmp3 + tmp11 := tmp1 + tmp2 + tmp13 := tmp1 - tmp2 + + tmp0 = x0 - x7 + tmp1 = x1 - x6 + tmp2 = x2 - x5 + tmp3 = x3 - x4 + + s[0] = (tmp10 + tmp11 - 8*centerJSample) << pass1Bits + s[4] = (tmp10 - tmp11) << pass1Bits + z1 := (tmp12 + tmp13) * fix_0_541196100 + z1 += 1 << (constBits - pass1Bits - 1) + s[2] = (z1 + tmp12*fix_0_765366865) >> (constBits - pass1Bits) + s[6] = (z1 - tmp13*fix_1_847759065) >> (constBits - pass1Bits) + + tmp10 = tmp0 + tmp3 + tmp11 = tmp1 + tmp2 + tmp12 = tmp0 + tmp2 + tmp13 = tmp1 + tmp3 + z1 = (tmp12 + tmp13) * fix_1_175875602 + z1 += 1 << (constBits - pass1Bits - 1) + tmp0 *= fix_1_501321110 + tmp1 *= fix_3_072711026 + tmp2 *= fix_2_053119869 + tmp3 *= fix_0_298631336 + tmp10 *= -fix_0_899976223 + tmp11 *= -fix_2_562915447 + tmp12 *= -fix_0_390180644 + tmp13 *= -fix_1_961570560 + + tmp12 += z1 + tmp13 += z1 + s[1] = (tmp0 + tmp10 + tmp12) >> (constBits - pass1Bits) + s[3] = (tmp1 + tmp11 + tmp13) >> (constBits - pass1Bits) + s[5] = (tmp2 + tmp11 + tmp12) >> (constBits - pass1Bits) + s[7] = (tmp3 + tmp10 + tmp13) >> (constBits - pass1Bits) + } + // Pass 2: process columns. + // We remove pass1Bits scaling, but leave results scaled up by an overall factor of 8. + for x := 0; x < 8; x++ { + tmp0 := b[0*8+x] + b[7*8+x] + tmp1 := b[1*8+x] + b[6*8+x] + tmp2 := b[2*8+x] + b[5*8+x] + tmp3 := b[3*8+x] + b[4*8+x] + + tmp10 := tmp0 + tmp3 + 1<<(pass1Bits-1) + tmp12 := tmp0 - tmp3 + tmp11 := tmp1 + tmp2 + tmp13 := tmp1 - tmp2 + + tmp0 = b[0*8+x] - b[7*8+x] + tmp1 = b[1*8+x] - b[6*8+x] + tmp2 = b[2*8+x] - b[5*8+x] + tmp3 = b[3*8+x] - b[4*8+x] + + b[0*8+x] = (tmp10 + tmp11) >> pass1Bits + b[4*8+x] = (tmp10 - tmp11) >> pass1Bits + + z1 := (tmp12 + tmp13) * fix_0_541196100 + z1 += 1 << (constBits + pass1Bits - 1) + b[2*8+x] = (z1 + tmp12*fix_0_765366865) >> (constBits + pass1Bits) + b[6*8+x] = (z1 - tmp13*fix_1_847759065) >> (constBits + pass1Bits) + + tmp10 = tmp0 + tmp3 + tmp11 = tmp1 + tmp2 + tmp12 = tmp0 + tmp2 + tmp13 = tmp1 + tmp3 + z1 = (tmp12 + tmp13) * fix_1_175875602 + z1 += 1 << (constBits + pass1Bits - 1) + tmp0 *= fix_1_501321110 + tmp1 *= fix_3_072711026 + tmp2 *= fix_2_053119869 + tmp3 *= fix_0_298631336 + tmp10 *= -fix_0_899976223 + tmp11 *= -fix_2_562915447 + tmp12 *= -fix_0_390180644 + tmp13 *= -fix_1_961570560 + + tmp12 += z1 + tmp13 += z1 + b[1*8+x] = (tmp0 + tmp10 + tmp12) >> (constBits + pass1Bits) + b[3*8+x] = (tmp1 + tmp11 + tmp13) >> (constBits + pass1Bits) + b[5*8+x] = (tmp2 + tmp11 + tmp12) >> (constBits + pass1Bits) + b[7*8+x] = (tmp3 + tmp10 + tmp13) >> (constBits + pass1Bits) + } +} diff --git a/src/image/jpeg/huffman.go b/src/image/jpeg/huffman.go new file mode 100644 index 0000000..95aaf71 --- /dev/null +++ b/src/image/jpeg/huffman.go @@ -0,0 +1,247 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "io" +) + +// maxCodeLength is the maximum (inclusive) number of bits in a Huffman code. +const maxCodeLength = 16 + +// maxNCodes is the maximum (inclusive) number of codes in a Huffman tree. +const maxNCodes = 256 + +// lutSize is the log-2 size of the Huffman decoder's look-up table. +const lutSize = 8 + +// huffman is a Huffman decoder, specified in section C. +type huffman struct { + // length is the number of codes in the tree. + nCodes int32 + // lut is the look-up table for the next lutSize bits in the bit-stream. + // The high 8 bits of the uint16 are the encoded value. The low 8 bits + // are 1 plus the code length, or 0 if the value is too large to fit in + // lutSize bits. + lut [1 << lutSize]uint16 + // vals are the decoded values, sorted by their encoding. + vals [maxNCodes]uint8 + // minCodes[i] is the minimum code of length i, or -1 if there are no + // codes of that length. + minCodes [maxCodeLength]int32 + // maxCodes[i] is the maximum code of length i, or -1 if there are no + // codes of that length. + maxCodes [maxCodeLength]int32 + // valsIndices[i] is the index into vals of minCodes[i]. + valsIndices [maxCodeLength]int32 +} + +// errShortHuffmanData means that an unexpected EOF occurred while decoding +// Huffman data. +var errShortHuffmanData = FormatError("short Huffman data") + +// ensureNBits reads bytes from the byte buffer to ensure that d.bits.n is at +// least n. For best performance (avoiding function calls inside hot loops), +// the caller is the one responsible for first checking that d.bits.n < n. +func (d *decoder) ensureNBits(n int32) error { + for { + c, err := d.readByteStuffedByte() + if err != nil { + if err == io.EOF { + return errShortHuffmanData + } + return err + } + d.bits.a = d.bits.a<<8 | uint32(c) + d.bits.n += 8 + if d.bits.m == 0 { + d.bits.m = 1 << 7 + } else { + d.bits.m <<= 8 + } + if d.bits.n >= n { + break + } + } + return nil +} + +// receiveExtend is the composition of RECEIVE and EXTEND, specified in section +// F.2.2.1. +func (d *decoder) receiveExtend(t uint8) (int32, error) { + if d.bits.n < int32(t) { + if err := d.ensureNBits(int32(t)); err != nil { + return 0, err + } + } + d.bits.n -= int32(t) + d.bits.m >>= t + s := int32(1) << t + x := int32(d.bits.a>>uint8(d.bits.n)) & (s - 1) + if x < s>>1 { + x += ((-1) << t) + 1 + } + return x, nil +} + +// processDHT processes a Define Huffman Table marker, and initializes a huffman +// struct from its contents. Specified in section B.2.4.2. +func (d *decoder) processDHT(n int) error { + for n > 0 { + if n < 17 { + return FormatError("DHT has wrong length") + } + if err := d.readFull(d.tmp[:17]); err != nil { + return err + } + tc := d.tmp[0] >> 4 + if tc > maxTc { + return FormatError("bad Tc value") + } + th := d.tmp[0] & 0x0f + // The baseline th <= 1 restriction is specified in table B.5. + if th > maxTh || (d.baseline && th > 1) { + return FormatError("bad Th value") + } + h := &d.huff[tc][th] + + // Read nCodes and h.vals (and derive h.nCodes). + // nCodes[i] is the number of codes with code length i. + // h.nCodes is the total number of codes. + h.nCodes = 0 + var nCodes [maxCodeLength]int32 + for i := range nCodes { + nCodes[i] = int32(d.tmp[i+1]) + h.nCodes += nCodes[i] + } + if h.nCodes == 0 { + return FormatError("Huffman table has zero length") + } + if h.nCodes > maxNCodes { + return FormatError("Huffman table has excessive length") + } + n -= int(h.nCodes) + 17 + if n < 0 { + return FormatError("DHT has wrong length") + } + if err := d.readFull(h.vals[:h.nCodes]); err != nil { + return err + } + + // Derive the look-up table. + for i := range h.lut { + h.lut[i] = 0 + } + var x, code uint32 + for i := uint32(0); i < lutSize; i++ { + code <<= 1 + for j := int32(0); j < nCodes[i]; j++ { + // The codeLength is 1+i, so shift code by 8-(1+i) to + // calculate the high bits for every 8-bit sequence + // whose codeLength's high bits matches code. + // The high 8 bits of lutValue are the encoded value. + // The low 8 bits are 1 plus the codeLength. + base := uint8(code << (7 - i)) + lutValue := uint16(h.vals[x])<<8 | uint16(2+i) + for k := uint8(0); k < 1<<(7-i); k++ { + h.lut[base|k] = lutValue + } + code++ + x++ + } + } + + // Derive minCodes, maxCodes, and valsIndices. + var c, index int32 + for i, n := range nCodes { + if n == 0 { + h.minCodes[i] = -1 + h.maxCodes[i] = -1 + h.valsIndices[i] = -1 + } else { + h.minCodes[i] = c + h.maxCodes[i] = c + n - 1 + h.valsIndices[i] = index + c += n + index += n + } + c <<= 1 + } + } + return nil +} + +// decodeHuffman returns the next Huffman-coded value from the bit-stream, +// decoded according to h. +func (d *decoder) decodeHuffman(h *huffman) (uint8, error) { + if h.nCodes == 0 { + return 0, FormatError("uninitialized Huffman table") + } + + if d.bits.n < 8 { + if err := d.ensureNBits(8); err != nil { + if err != errMissingFF00 && err != errShortHuffmanData { + return 0, err + } + // There are no more bytes of data in this segment, but we may still + // be able to read the next symbol out of the previously read bits. + // First, undo the readByte that the ensureNBits call made. + if d.bytes.nUnreadable != 0 { + d.unreadByteStuffedByte() + } + goto slowPath + } + } + if v := h.lut[(d.bits.a>>uint32(d.bits.n-lutSize))&0xff]; v != 0 { + n := (v & 0xff) - 1 + d.bits.n -= int32(n) + d.bits.m >>= n + return uint8(v >> 8), nil + } + +slowPath: + for i, code := 0, int32(0); i < maxCodeLength; i++ { + if d.bits.n == 0 { + if err := d.ensureNBits(1); err != nil { + return 0, err + } + } + if d.bits.a&d.bits.m != 0 { + code |= 1 + } + d.bits.n-- + d.bits.m >>= 1 + if code <= h.maxCodes[i] { + return h.vals[h.valsIndices[i]+code-h.minCodes[i]], nil + } + code <<= 1 + } + return 0, FormatError("bad Huffman code") +} + +func (d *decoder) decodeBit() (bool, error) { + if d.bits.n == 0 { + if err := d.ensureNBits(1); err != nil { + return false, err + } + } + ret := d.bits.a&d.bits.m != 0 + d.bits.n-- + d.bits.m >>= 1 + return ret, nil +} + +func (d *decoder) decodeBits(n int32) (uint32, error) { + if d.bits.n < n { + if err := d.ensureNBits(n); err != nil { + return 0, err + } + } + ret := d.bits.a >> uint32(d.bits.n-n) + ret &= (1 << uint32(n)) - 1 + d.bits.n -= n + d.bits.m >>= uint32(n) + return ret, nil +} diff --git a/src/image/jpeg/idct.go b/src/image/jpeg/idct.go new file mode 100644 index 0000000..a3957c8 --- /dev/null +++ b/src/image/jpeg/idct.go @@ -0,0 +1,194 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +// This is a Go translation of idct.c from +// +// http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_IEC_13818-4_2004_Conformance_Testing/Video/verifier/mpeg2decode_960109.tar.gz +// +// which carries the following notice: + +/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */ + +/* + * Disclaimer of Warranty + * + * These software programs are available to the user without any license fee or + * royalty on an "as is" basis. The MPEG Software Simulation Group disclaims + * any and all warranties, whether express, implied, or statuary, including any + * implied warranties or merchantability or of fitness for a particular + * purpose. In no event shall the copyright-holder be liable for any + * incidental, punitive, or consequential damages of any kind whatsoever + * arising from the use of these programs. + * + * This disclaimer of warranty extends to the user of these programs and user's + * customers, employees, agents, transferees, successors, and assigns. + * + * The MPEG Software Simulation Group does not represent or warrant that the + * programs furnished hereunder are free of infringement of any third-party + * patents. + * + * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware, + * are subject to royalty fees to patent holders. Many of these patents are + * general enough such that they are unavoidable regardless of implementation + * design. + * + */ + +const blockSize = 64 // A DCT block is 8x8. + +type block [blockSize]int32 + +const ( + w1 = 2841 // 2048*sqrt(2)*cos(1*pi/16) + w2 = 2676 // 2048*sqrt(2)*cos(2*pi/16) + w3 = 2408 // 2048*sqrt(2)*cos(3*pi/16) + w5 = 1609 // 2048*sqrt(2)*cos(5*pi/16) + w6 = 1108 // 2048*sqrt(2)*cos(6*pi/16) + w7 = 565 // 2048*sqrt(2)*cos(7*pi/16) + + w1pw7 = w1 + w7 + w1mw7 = w1 - w7 + w2pw6 = w2 + w6 + w2mw6 = w2 - w6 + w3pw5 = w3 + w5 + w3mw5 = w3 - w5 + + r2 = 181 // 256/sqrt(2) +) + +// idct performs a 2-D Inverse Discrete Cosine Transformation. +// +// The input coefficients should already have been multiplied by the +// appropriate quantization table. We use fixed-point computation, with the +// number of bits for the fractional component varying over the intermediate +// stages. +// +// For more on the actual algorithm, see Z. Wang, "Fast algorithms for the +// discrete W transform and for the discrete Fourier transform", IEEE Trans. on +// ASSP, Vol. ASSP- 32, pp. 803-816, Aug. 1984. +func idct(src *block) { + // Horizontal 1-D IDCT. + for y := 0; y < 8; y++ { + y8 := y * 8 + s := src[y8 : y8+8 : y8+8] // Small cap improves performance, see https://golang.org/issue/27857 + // If all the AC components are zero, then the IDCT is trivial. + if s[1] == 0 && s[2] == 0 && s[3] == 0 && + s[4] == 0 && s[5] == 0 && s[6] == 0 && s[7] == 0 { + dc := s[0] << 3 + s[0] = dc + s[1] = dc + s[2] = dc + s[3] = dc + s[4] = dc + s[5] = dc + s[6] = dc + s[7] = dc + continue + } + + // Prescale. + x0 := (s[0] << 11) + 128 + x1 := s[4] << 11 + x2 := s[6] + x3 := s[2] + x4 := s[1] + x5 := s[7] + x6 := s[5] + x7 := s[3] + + // Stage 1. + x8 := w7 * (x4 + x5) + x4 = x8 + w1mw7*x4 + x5 = x8 - w1pw7*x5 + x8 = w3 * (x6 + x7) + x6 = x8 - w3mw5*x6 + x7 = x8 - w3pw5*x7 + + // Stage 2. + x8 = x0 + x1 + x0 -= x1 + x1 = w6 * (x3 + x2) + x2 = x1 - w2pw6*x2 + x3 = x1 + w2mw6*x3 + x1 = x4 + x6 + x4 -= x6 + x6 = x5 + x7 + x5 -= x7 + + // Stage 3. + x7 = x8 + x3 + x8 -= x3 + x3 = x0 + x2 + x0 -= x2 + x2 = (r2*(x4+x5) + 128) >> 8 + x4 = (r2*(x4-x5) + 128) >> 8 + + // Stage 4. + s[0] = (x7 + x1) >> 8 + s[1] = (x3 + x2) >> 8 + s[2] = (x0 + x4) >> 8 + s[3] = (x8 + x6) >> 8 + s[4] = (x8 - x6) >> 8 + s[5] = (x0 - x4) >> 8 + s[6] = (x3 - x2) >> 8 + s[7] = (x7 - x1) >> 8 + } + + // Vertical 1-D IDCT. + for x := 0; x < 8; x++ { + // Similar to the horizontal 1-D IDCT case, if all the AC components are zero, then the IDCT is trivial. + // However, after performing the horizontal 1-D IDCT, there are typically non-zero AC components, so + // we do not bother to check for the all-zero case. + s := src[x : x+57 : x+57] // Small cap improves performance, see https://golang.org/issue/27857 + + // Prescale. + y0 := (s[8*0] << 8) + 8192 + y1 := s[8*4] << 8 + y2 := s[8*6] + y3 := s[8*2] + y4 := s[8*1] + y5 := s[8*7] + y6 := s[8*5] + y7 := s[8*3] + + // Stage 1. + y8 := w7*(y4+y5) + 4 + y4 = (y8 + w1mw7*y4) >> 3 + y5 = (y8 - w1pw7*y5) >> 3 + y8 = w3*(y6+y7) + 4 + y6 = (y8 - w3mw5*y6) >> 3 + y7 = (y8 - w3pw5*y7) >> 3 + + // Stage 2. + y8 = y0 + y1 + y0 -= y1 + y1 = w6*(y3+y2) + 4 + y2 = (y1 - w2pw6*y2) >> 3 + y3 = (y1 + w2mw6*y3) >> 3 + y1 = y4 + y6 + y4 -= y6 + y6 = y5 + y7 + y5 -= y7 + + // Stage 3. + y7 = y8 + y3 + y8 -= y3 + y3 = y0 + y2 + y0 -= y2 + y2 = (r2*(y4+y5) + 128) >> 8 + y4 = (r2*(y4-y5) + 128) >> 8 + + // Stage 4. + s[8*0] = (y7 + y1) >> 14 + s[8*1] = (y3 + y2) >> 14 + s[8*2] = (y0 + y4) >> 14 + s[8*3] = (y8 + y6) >> 14 + s[8*4] = (y8 - y6) >> 14 + s[8*5] = (y0 - y4) >> 14 + s[8*6] = (y3 - y2) >> 14 + s[8*7] = (y7 - y1) >> 14 + } +} diff --git a/src/image/jpeg/reader.go b/src/image/jpeg/reader.go new file mode 100644 index 0000000..b340723 --- /dev/null +++ b/src/image/jpeg/reader.go @@ -0,0 +1,815 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package jpeg implements a JPEG image decoder and encoder. +// +// JPEG is defined in ITU-T T.81: https://www.w3.org/Graphics/JPEG/itu-t81.pdf. +package jpeg + +import ( + "image" + "image/color" + "image/internal/imageutil" + "io" +) + +// A FormatError reports that the input is not a valid JPEG. +type FormatError string + +func (e FormatError) Error() string { return "invalid JPEG format: " + string(e) } + +// An UnsupportedError reports that the input uses a valid but unimplemented JPEG feature. +type UnsupportedError string + +func (e UnsupportedError) Error() string { return "unsupported JPEG feature: " + string(e) } + +var errUnsupportedSubsamplingRatio = UnsupportedError("luma/chroma subsampling ratio") + +// Component specification, specified in section B.2.2. +type component struct { + h int // Horizontal sampling factor. + v int // Vertical sampling factor. + c uint8 // Component identifier. + tq uint8 // Quantization table destination selector. +} + +const ( + dcTable = 0 + acTable = 1 + maxTc = 1 + maxTh = 3 + maxTq = 3 + + maxComponents = 4 +) + +const ( + sof0Marker = 0xc0 // Start Of Frame (Baseline Sequential). + sof1Marker = 0xc1 // Start Of Frame (Extended Sequential). + sof2Marker = 0xc2 // Start Of Frame (Progressive). + dhtMarker = 0xc4 // Define Huffman Table. + rst0Marker = 0xd0 // ReSTart (0). + rst7Marker = 0xd7 // ReSTart (7). + soiMarker = 0xd8 // Start Of Image. + eoiMarker = 0xd9 // End Of Image. + sosMarker = 0xda // Start Of Scan. + dqtMarker = 0xdb // Define Quantization Table. + driMarker = 0xdd // Define Restart Interval. + comMarker = 0xfe // COMment. + // "APPlication specific" markers aren't part of the JPEG spec per se, + // but in practice, their use is described at + // https://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html + app0Marker = 0xe0 + app14Marker = 0xee + app15Marker = 0xef +) + +// See https://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe +const ( + adobeTransformUnknown = 0 + adobeTransformYCbCr = 1 + adobeTransformYCbCrK = 2 +) + +// unzig maps from the zig-zag ordering to the natural ordering. For example, +// unzig[3] is the column and row of the fourth element in zig-zag order. The +// value is 16, which means first column (16%8 == 0) and third row (16/8 == 2). +var unzig = [blockSize]int{ + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63, +} + +// Deprecated: Reader is not used by the image/jpeg package and should +// not be used by others. It is kept for compatibility. +type Reader interface { + io.ByteReader + io.Reader +} + +// bits holds the unprocessed bits that have been taken from the byte-stream. +// The n least significant bits of a form the unread bits, to be read in MSB to +// LSB order. +type bits struct { + a uint32 // accumulator. + m uint32 // mask. m==1<<(n-1) when n>0, with m==0 when n==0. + n int32 // the number of unread bits in a. +} + +type decoder struct { + r io.Reader + bits bits + // bytes is a byte buffer, similar to a bufio.Reader, except that it + // has to be able to unread more than 1 byte, due to byte stuffing. + // Byte stuffing is specified in section F.1.2.3. + bytes struct { + // buf[i:j] are the buffered bytes read from the underlying + // io.Reader that haven't yet been passed further on. + buf [4096]byte + i, j int + // nUnreadable is the number of bytes to back up i after + // overshooting. It can be 0, 1 or 2. + nUnreadable int + } + width, height int + + img1 *image.Gray + img3 *image.YCbCr + blackPix []byte + blackStride int + + ri int // Restart Interval. + nComp int + + // As per section 4.5, there are four modes of operation (selected by the + // SOF? markers): sequential DCT, progressive DCT, lossless and + // hierarchical, although this implementation does not support the latter + // two non-DCT modes. Sequential DCT is further split into baseline and + // extended, as per section 4.11. + baseline bool + progressive bool + + jfif bool + adobeTransformValid bool + adobeTransform uint8 + eobRun uint16 // End-of-Band run, specified in section G.1.2.2. + + comp [maxComponents]component + progCoeffs [maxComponents][]block // Saved state between progressive-mode scans. + huff [maxTc + 1][maxTh + 1]huffman + quant [maxTq + 1]block // Quantization tables, in zig-zag order. + tmp [2 * blockSize]byte +} + +// fill fills up the d.bytes.buf buffer from the underlying io.Reader. It +// should only be called when there are no unread bytes in d.bytes. +func (d *decoder) fill() error { + if d.bytes.i != d.bytes.j { + panic("jpeg: fill called when unread bytes exist") + } + // Move the last 2 bytes to the start of the buffer, in case we need + // to call unreadByteStuffedByte. + if d.bytes.j > 2 { + d.bytes.buf[0] = d.bytes.buf[d.bytes.j-2] + d.bytes.buf[1] = d.bytes.buf[d.bytes.j-1] + d.bytes.i, d.bytes.j = 2, 2 + } + // Fill in the rest of the buffer. + n, err := d.r.Read(d.bytes.buf[d.bytes.j:]) + d.bytes.j += n + if n > 0 { + err = nil + } + return err +} + +// unreadByteStuffedByte undoes the most recent readByteStuffedByte call, +// giving a byte of data back from d.bits to d.bytes. The Huffman look-up table +// requires at least 8 bits for look-up, which means that Huffman decoding can +// sometimes overshoot and read one or two too many bytes. Two-byte overshoot +// can happen when expecting to read a 0xff 0x00 byte-stuffed byte. +func (d *decoder) unreadByteStuffedByte() { + d.bytes.i -= d.bytes.nUnreadable + d.bytes.nUnreadable = 0 + if d.bits.n >= 8 { + d.bits.a >>= 8 + d.bits.n -= 8 + d.bits.m >>= 8 + } +} + +// readByte returns the next byte, whether buffered or not buffered. It does +// not care about byte stuffing. +func (d *decoder) readByte() (x byte, err error) { + for d.bytes.i == d.bytes.j { + if err = d.fill(); err != nil { + return 0, err + } + } + x = d.bytes.buf[d.bytes.i] + d.bytes.i++ + d.bytes.nUnreadable = 0 + return x, nil +} + +// errMissingFF00 means that readByteStuffedByte encountered an 0xff byte (a +// marker byte) that wasn't the expected byte-stuffed sequence 0xff, 0x00. +var errMissingFF00 = FormatError("missing 0xff00 sequence") + +// readByteStuffedByte is like readByte but is for byte-stuffed Huffman data. +func (d *decoder) readByteStuffedByte() (x byte, err error) { + // Take the fast path if d.bytes.buf contains at least two bytes. + if d.bytes.i+2 <= d.bytes.j { + x = d.bytes.buf[d.bytes.i] + d.bytes.i++ + d.bytes.nUnreadable = 1 + if x != 0xff { + return x, err + } + if d.bytes.buf[d.bytes.i] != 0x00 { + return 0, errMissingFF00 + } + d.bytes.i++ + d.bytes.nUnreadable = 2 + return 0xff, nil + } + + d.bytes.nUnreadable = 0 + + x, err = d.readByte() + if err != nil { + return 0, err + } + d.bytes.nUnreadable = 1 + if x != 0xff { + return x, nil + } + + x, err = d.readByte() + if err != nil { + return 0, err + } + d.bytes.nUnreadable = 2 + if x != 0x00 { + return 0, errMissingFF00 + } + return 0xff, nil +} + +// readFull reads exactly len(p) bytes into p. It does not care about byte +// stuffing. +func (d *decoder) readFull(p []byte) error { + // Unread the overshot bytes, if any. + if d.bytes.nUnreadable != 0 { + if d.bits.n >= 8 { + d.unreadByteStuffedByte() + } + d.bytes.nUnreadable = 0 + } + + for { + n := copy(p, d.bytes.buf[d.bytes.i:d.bytes.j]) + p = p[n:] + d.bytes.i += n + if len(p) == 0 { + break + } + if err := d.fill(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return err + } + } + return nil +} + +// ignore ignores the next n bytes. +func (d *decoder) ignore(n int) error { + // Unread the overshot bytes, if any. + if d.bytes.nUnreadable != 0 { + if d.bits.n >= 8 { + d.unreadByteStuffedByte() + } + d.bytes.nUnreadable = 0 + } + + for { + m := d.bytes.j - d.bytes.i + if m > n { + m = n + } + d.bytes.i += m + n -= m + if n == 0 { + break + } + if err := d.fill(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return err + } + } + return nil +} + +// Specified in section B.2.2. +func (d *decoder) processSOF(n int) error { + if d.nComp != 0 { + return FormatError("multiple SOF markers") + } + switch n { + case 6 + 3*1: // Grayscale image. + d.nComp = 1 + case 6 + 3*3: // YCbCr or RGB image. + d.nComp = 3 + case 6 + 3*4: // YCbCrK or CMYK image. + d.nComp = 4 + default: + return UnsupportedError("number of components") + } + if err := d.readFull(d.tmp[:n]); err != nil { + return err + } + // We only support 8-bit precision. + if d.tmp[0] != 8 { + return UnsupportedError("precision") + } + d.height = int(d.tmp[1])<<8 + int(d.tmp[2]) + d.width = int(d.tmp[3])<<8 + int(d.tmp[4]) + if int(d.tmp[5]) != d.nComp { + return FormatError("SOF has wrong length") + } + + for i := 0; i < d.nComp; i++ { + d.comp[i].c = d.tmp[6+3*i] + // Section B.2.2 states that "the value of C_i shall be different from + // the values of C_1 through C_(i-1)". + for j := 0; j < i; j++ { + if d.comp[i].c == d.comp[j].c { + return FormatError("repeated component identifier") + } + } + + d.comp[i].tq = d.tmp[8+3*i] + if d.comp[i].tq > maxTq { + return FormatError("bad Tq value") + } + + hv := d.tmp[7+3*i] + h, v := int(hv>>4), int(hv&0x0f) + if h < 1 || 4 < h || v < 1 || 4 < v { + return FormatError("luma/chroma subsampling ratio") + } + if h == 3 || v == 3 { + return errUnsupportedSubsamplingRatio + } + switch d.nComp { + case 1: + // If a JPEG image has only one component, section A.2 says "this data + // is non-interleaved by definition" and section A.2.2 says "[in this + // case...] the order of data units within a scan shall be left-to-right + // and top-to-bottom... regardless of the values of H_1 and V_1". Section + // 4.8.2 also says "[for non-interleaved data], the MCU is defined to be + // one data unit". Similarly, section A.1.1 explains that it is the ratio + // of H_i to max_j(H_j) that matters, and similarly for V. For grayscale + // images, H_1 is the maximum H_j for all components j, so that ratio is + // always 1. The component's (h, v) is effectively always (1, 1): even if + // the nominal (h, v) is (2, 1), a 20x5 image is encoded in three 8x8 + // MCUs, not two 16x8 MCUs. + h, v = 1, 1 + + case 3: + // For YCbCr images, we only support 4:4:4, 4:4:0, 4:2:2, 4:2:0, + // 4:1:1 or 4:1:0 chroma subsampling ratios. This implies that the + // (h, v) values for the Y component are either (1, 1), (1, 2), + // (2, 1), (2, 2), (4, 1) or (4, 2), and the Y component's values + // must be a multiple of the Cb and Cr component's values. We also + // assume that the two chroma components have the same subsampling + // ratio. + switch i { + case 0: // Y. + // We have already verified, above, that h and v are both + // either 1, 2 or 4, so invalid (h, v) combinations are those + // with v == 4. + if v == 4 { + return errUnsupportedSubsamplingRatio + } + case 1: // Cb. + if d.comp[0].h%h != 0 || d.comp[0].v%v != 0 { + return errUnsupportedSubsamplingRatio + } + case 2: // Cr. + if d.comp[1].h != h || d.comp[1].v != v { + return errUnsupportedSubsamplingRatio + } + } + + case 4: + // For 4-component images (either CMYK or YCbCrK), we only support two + // hv vectors: [0x11 0x11 0x11 0x11] and [0x22 0x11 0x11 0x22]. + // Theoretically, 4-component JPEG images could mix and match hv values + // but in practice, those two combinations are the only ones in use, + // and it simplifies the applyBlack code below if we can assume that: + // - for CMYK, the C and K channels have full samples, and if the M + // and Y channels subsample, they subsample both horizontally and + // vertically. + // - for YCbCrK, the Y and K channels have full samples. + switch i { + case 0: + if hv != 0x11 && hv != 0x22 { + return errUnsupportedSubsamplingRatio + } + case 1, 2: + if hv != 0x11 { + return errUnsupportedSubsamplingRatio + } + case 3: + if d.comp[0].h != h || d.comp[0].v != v { + return errUnsupportedSubsamplingRatio + } + } + } + + d.comp[i].h = h + d.comp[i].v = v + } + return nil +} + +// Specified in section B.2.4.1. +func (d *decoder) processDQT(n int) error { +loop: + for n > 0 { + n-- + x, err := d.readByte() + if err != nil { + return err + } + tq := x & 0x0f + if tq > maxTq { + return FormatError("bad Tq value") + } + switch x >> 4 { + default: + return FormatError("bad Pq value") + case 0: + if n < blockSize { + break loop + } + n -= blockSize + if err := d.readFull(d.tmp[:blockSize]); err != nil { + return err + } + for i := range d.quant[tq] { + d.quant[tq][i] = int32(d.tmp[i]) + } + case 1: + if n < 2*blockSize { + break loop + } + n -= 2 * blockSize + if err := d.readFull(d.tmp[:2*blockSize]); err != nil { + return err + } + for i := range d.quant[tq] { + d.quant[tq][i] = int32(d.tmp[2*i])<<8 | int32(d.tmp[2*i+1]) + } + } + } + if n != 0 { + return FormatError("DQT has wrong length") + } + return nil +} + +// Specified in section B.2.4.4. +func (d *decoder) processDRI(n int) error { + if n != 2 { + return FormatError("DRI has wrong length") + } + if err := d.readFull(d.tmp[:2]); err != nil { + return err + } + d.ri = int(d.tmp[0])<<8 + int(d.tmp[1]) + return nil +} + +func (d *decoder) processApp0Marker(n int) error { + if n < 5 { + return d.ignore(n) + } + if err := d.readFull(d.tmp[:5]); err != nil { + return err + } + n -= 5 + + d.jfif = d.tmp[0] == 'J' && d.tmp[1] == 'F' && d.tmp[2] == 'I' && d.tmp[3] == 'F' && d.tmp[4] == '\x00' + + if n > 0 { + return d.ignore(n) + } + return nil +} + +func (d *decoder) processApp14Marker(n int) error { + if n < 12 { + return d.ignore(n) + } + if err := d.readFull(d.tmp[:12]); err != nil { + return err + } + n -= 12 + + if d.tmp[0] == 'A' && d.tmp[1] == 'd' && d.tmp[2] == 'o' && d.tmp[3] == 'b' && d.tmp[4] == 'e' { + d.adobeTransformValid = true + d.adobeTransform = d.tmp[11] + } + + if n > 0 { + return d.ignore(n) + } + return nil +} + +// decode reads a JPEG image from r and returns it as an image.Image. +func (d *decoder) decode(r io.Reader, configOnly bool) (image.Image, error) { + d.r = r + + // Check for the Start Of Image marker. + if err := d.readFull(d.tmp[:2]); err != nil { + return nil, err + } + if d.tmp[0] != 0xff || d.tmp[1] != soiMarker { + return nil, FormatError("missing SOI marker") + } + + // Process the remaining segments until the End Of Image marker. + for { + err := d.readFull(d.tmp[:2]) + if err != nil { + return nil, err + } + for d.tmp[0] != 0xff { + // Strictly speaking, this is a format error. However, libjpeg is + // liberal in what it accepts. As of version 9, next_marker in + // jdmarker.c treats this as a warning (JWRN_EXTRANEOUS_DATA) and + // continues to decode the stream. Even before next_marker sees + // extraneous data, jpeg_fill_bit_buffer in jdhuff.c reads as many + // bytes as it can, possibly past the end of a scan's data. It + // effectively puts back any markers that it overscanned (e.g. an + // "\xff\xd9" EOI marker), but it does not put back non-marker data, + // and thus it can silently ignore a small number of extraneous + // non-marker bytes before next_marker has a chance to see them (and + // print a warning). + // + // We are therefore also liberal in what we accept. Extraneous data + // is silently ignored. + // + // This is similar to, but not exactly the same as, the restart + // mechanism within a scan (the RST[0-7] markers). + // + // Note that extraneous 0xff bytes in e.g. SOS data are escaped as + // "\xff\x00", and so are detected a little further down below. + d.tmp[0] = d.tmp[1] + d.tmp[1], err = d.readByte() + if err != nil { + return nil, err + } + } + marker := d.tmp[1] + if marker == 0 { + // Treat "\xff\x00" as extraneous data. + continue + } + for marker == 0xff { + // Section B.1.1.2 says, "Any marker may optionally be preceded by any + // number of fill bytes, which are bytes assigned code X'FF'". + marker, err = d.readByte() + if err != nil { + return nil, err + } + } + if marker == eoiMarker { // End Of Image. + break + } + if rst0Marker <= marker && marker <= rst7Marker { + // Figures B.2 and B.16 of the specification suggest that restart markers should + // only occur between Entropy Coded Segments and not after the final ECS. + // However, some encoders may generate incorrect JPEGs with a final restart + // marker. That restart marker will be seen here instead of inside the processSOS + // method, and is ignored as a harmless error. Restart markers have no extra data, + // so we check for this before we read the 16-bit length of the segment. + continue + } + + // Read the 16-bit length of the segment. The value includes the 2 bytes for the + // length itself, so we subtract 2 to get the number of remaining bytes. + if err = d.readFull(d.tmp[:2]); err != nil { + return nil, err + } + n := int(d.tmp[0])<<8 + int(d.tmp[1]) - 2 + if n < 0 { + return nil, FormatError("short segment length") + } + + switch marker { + case sof0Marker, sof1Marker, sof2Marker: + d.baseline = marker == sof0Marker + d.progressive = marker == sof2Marker + err = d.processSOF(n) + if configOnly && d.jfif { + return nil, err + } + case dhtMarker: + if configOnly { + err = d.ignore(n) + } else { + err = d.processDHT(n) + } + case dqtMarker: + if configOnly { + err = d.ignore(n) + } else { + err = d.processDQT(n) + } + case sosMarker: + if configOnly { + return nil, nil + } + err = d.processSOS(n) + case driMarker: + if configOnly { + err = d.ignore(n) + } else { + err = d.processDRI(n) + } + case app0Marker: + err = d.processApp0Marker(n) + case app14Marker: + err = d.processApp14Marker(n) + default: + if app0Marker <= marker && marker <= app15Marker || marker == comMarker { + err = d.ignore(n) + } else if marker < 0xc0 { // See Table B.1 "Marker code assignments". + err = FormatError("unknown marker") + } else { + err = UnsupportedError("unknown marker") + } + } + if err != nil { + return nil, err + } + } + + if d.progressive { + if err := d.reconstructProgressiveImage(); err != nil { + return nil, err + } + } + if d.img1 != nil { + return d.img1, nil + } + if d.img3 != nil { + if d.blackPix != nil { + return d.applyBlack() + } else if d.isRGB() { + return d.convertToRGB() + } + return d.img3, nil + } + return nil, FormatError("missing SOS marker") +} + +// applyBlack combines d.img3 and d.blackPix into a CMYK image. The formula +// used depends on whether the JPEG image is stored as CMYK or YCbCrK, +// indicated by the APP14 (Adobe) metadata. +// +// Adobe CMYK JPEG images are inverted, where 255 means no ink instead of full +// ink, so we apply "v = 255 - v" at various points. Note that a double +// inversion is a no-op, so inversions might be implicit in the code below. +func (d *decoder) applyBlack() (image.Image, error) { + if !d.adobeTransformValid { + return nil, UnsupportedError("unknown color model: 4-component JPEG doesn't have Adobe APP14 metadata") + } + + // If the 4-component JPEG image isn't explicitly marked as "Unknown (RGB + // or CMYK)" as per + // https://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe + // we assume that it is YCbCrK. This matches libjpeg's jdapimin.c. + if d.adobeTransform != adobeTransformUnknown { + // Convert the YCbCr part of the YCbCrK to RGB, invert the RGB to get + // CMY, and patch in the original K. The RGB to CMY inversion cancels + // out the 'Adobe inversion' described in the applyBlack doc comment + // above, so in practice, only the fourth channel (black) is inverted. + bounds := d.img3.Bounds() + img := image.NewRGBA(bounds) + imageutil.DrawYCbCr(img, bounds, d.img3, bounds.Min) + for iBase, y := 0, bounds.Min.Y; y < bounds.Max.Y; iBase, y = iBase+img.Stride, y+1 { + for i, x := iBase+3, bounds.Min.X; x < bounds.Max.X; i, x = i+4, x+1 { + img.Pix[i] = 255 - d.blackPix[(y-bounds.Min.Y)*d.blackStride+(x-bounds.Min.X)] + } + } + return &image.CMYK{ + Pix: img.Pix, + Stride: img.Stride, + Rect: img.Rect, + }, nil + } + + // The first three channels (cyan, magenta, yellow) of the CMYK + // were decoded into d.img3, but each channel was decoded into a separate + // []byte slice, and some channels may be subsampled. We interleave the + // separate channels into an image.CMYK's single []byte slice containing 4 + // contiguous bytes per pixel. + bounds := d.img3.Bounds() + img := image.NewCMYK(bounds) + + translations := [4]struct { + src []byte + stride int + }{ + {d.img3.Y, d.img3.YStride}, + {d.img3.Cb, d.img3.CStride}, + {d.img3.Cr, d.img3.CStride}, + {d.blackPix, d.blackStride}, + } + for t, translation := range translations { + subsample := d.comp[t].h != d.comp[0].h || d.comp[t].v != d.comp[0].v + for iBase, y := 0, bounds.Min.Y; y < bounds.Max.Y; iBase, y = iBase+img.Stride, y+1 { + sy := y - bounds.Min.Y + if subsample { + sy /= 2 + } + for i, x := iBase+t, bounds.Min.X; x < bounds.Max.X; i, x = i+4, x+1 { + sx := x - bounds.Min.X + if subsample { + sx /= 2 + } + img.Pix[i] = 255 - translation.src[sy*translation.stride+sx] + } + } + } + return img, nil +} + +func (d *decoder) isRGB() bool { + if d.jfif { + return false + } + if d.adobeTransformValid && d.adobeTransform == adobeTransformUnknown { + // https://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#Adobe + // says that 0 means Unknown (and in practice RGB) and 1 means YCbCr. + return true + } + return d.comp[0].c == 'R' && d.comp[1].c == 'G' && d.comp[2].c == 'B' +} + +func (d *decoder) convertToRGB() (image.Image, error) { + cScale := d.comp[0].h / d.comp[1].h + bounds := d.img3.Bounds() + img := image.NewRGBA(bounds) + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + po := img.PixOffset(bounds.Min.X, y) + yo := d.img3.YOffset(bounds.Min.X, y) + co := d.img3.COffset(bounds.Min.X, y) + for i, iMax := 0, bounds.Max.X-bounds.Min.X; i < iMax; i++ { + img.Pix[po+4*i+0] = d.img3.Y[yo+i] + img.Pix[po+4*i+1] = d.img3.Cb[co+i/cScale] + img.Pix[po+4*i+2] = d.img3.Cr[co+i/cScale] + img.Pix[po+4*i+3] = 255 + } + } + return img, nil +} + +// Decode reads a JPEG image from r and returns it as an image.Image. +func Decode(r io.Reader) (image.Image, error) { + var d decoder + return d.decode(r, false) +} + +// DecodeConfig returns the color model and dimensions of a JPEG image without +// decoding the entire image. +func DecodeConfig(r io.Reader) (image.Config, error) { + var d decoder + if _, err := d.decode(r, true); err != nil { + return image.Config{}, err + } + switch d.nComp { + case 1: + return image.Config{ + ColorModel: color.GrayModel, + Width: d.width, + Height: d.height, + }, nil + case 3: + cm := color.YCbCrModel + if d.isRGB() { + cm = color.RGBAModel + } + return image.Config{ + ColorModel: cm, + Width: d.width, + Height: d.height, + }, nil + case 4: + return image.Config{ + ColorModel: color.CMYKModel, + Width: d.width, + Height: d.height, + }, nil + } + return image.Config{}, FormatError("missing SOF marker") +} + +func init() { + image.RegisterFormat("jpeg", "\xff\xd8", Decode, DecodeConfig) +} diff --git a/src/image/jpeg/reader_test.go b/src/image/jpeg/reader_test.go new file mode 100644 index 0000000..bf07fad --- /dev/null +++ b/src/image/jpeg/reader_test.go @@ -0,0 +1,517 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "bytes" + "encoding/base64" + "fmt" + "image" + "image/color" + "io" + "math/rand" + "os" + "strings" + "testing" + "time" +) + +// TestDecodeProgressive tests that decoding the baseline and progressive +// versions of the same image result in exactly the same pixel data, in YCbCr +// space for color images, and Y space for grayscale images. +func TestDecodeProgressive(t *testing.T) { + testCases := []string{ + "../testdata/video-001", + "../testdata/video-001.q50.410", + "../testdata/video-001.q50.411", + "../testdata/video-001.q50.420", + "../testdata/video-001.q50.422", + "../testdata/video-001.q50.440", + "../testdata/video-001.q50.444", + "../testdata/video-005.gray.q50", + "../testdata/video-005.gray.q50.2x2", + "../testdata/video-001.separate.dc.progression", + } + for _, tc := range testCases { + m0, err := decodeFile(tc + ".jpeg") + if err != nil { + t.Errorf("%s: %v", tc+".jpeg", err) + continue + } + m1, err := decodeFile(tc + ".progressive.jpeg") + if err != nil { + t.Errorf("%s: %v", tc+".progressive.jpeg", err) + continue + } + if m0.Bounds() != m1.Bounds() { + t.Errorf("%s: bounds differ: %v and %v", tc, m0.Bounds(), m1.Bounds()) + continue + } + // All of the video-*.jpeg files are 150x103. + if m0.Bounds() != image.Rect(0, 0, 150, 103) { + t.Errorf("%s: bad bounds: %v", tc, m0.Bounds()) + continue + } + + switch m0 := m0.(type) { + case *image.YCbCr: + m1 := m1.(*image.YCbCr) + if err := check(m0.Bounds(), m0.Y, m1.Y, m0.YStride, m1.YStride); err != nil { + t.Errorf("%s (Y): %v", tc, err) + continue + } + if err := check(m0.Bounds(), m0.Cb, m1.Cb, m0.CStride, m1.CStride); err != nil { + t.Errorf("%s (Cb): %v", tc, err) + continue + } + if err := check(m0.Bounds(), m0.Cr, m1.Cr, m0.CStride, m1.CStride); err != nil { + t.Errorf("%s (Cr): %v", tc, err) + continue + } + case *image.Gray: + m1 := m1.(*image.Gray) + if err := check(m0.Bounds(), m0.Pix, m1.Pix, m0.Stride, m1.Stride); err != nil { + t.Errorf("%s: %v", tc, err) + continue + } + default: + t.Errorf("%s: unexpected image type %T", tc, m0) + continue + } + } +} + +func decodeFile(filename string) (image.Image, error) { + f, err := os.Open(filename) + if err != nil { + return nil, err + } + defer f.Close() + return Decode(f) +} + +type eofReader struct { + data []byte // deliver from Read without EOF + dataEOF []byte // then deliver from Read with EOF on last chunk + lenAtEOF int +} + +func (r *eofReader) Read(b []byte) (n int, err error) { + if len(r.data) > 0 { + n = copy(b, r.data) + r.data = r.data[n:] + } else { + n = copy(b, r.dataEOF) + r.dataEOF = r.dataEOF[n:] + if len(r.dataEOF) == 0 { + err = io.EOF + if r.lenAtEOF == -1 { + r.lenAtEOF = n + } + } + } + return +} + +func TestDecodeEOF(t *testing.T) { + // Check that if reader returns final data and EOF at same time, jpeg handles it. + data, err := os.ReadFile("../testdata/video-001.jpeg") + if err != nil { + t.Fatal(err) + } + + n := len(data) + for i := 0; i < n; { + r := &eofReader{data[:n-i], data[n-i:], -1} + _, err := Decode(r) + if err != nil { + t.Errorf("Decode with Read() = %d, EOF: %v", r.lenAtEOF, err) + } + if i == 0 { + i = 1 + } else { + i *= 2 + } + } +} + +// check checks that the two pix data are equal, within the given bounds. +func check(bounds image.Rectangle, pix0, pix1 []byte, stride0, stride1 int) error { + if stride0 <= 0 || stride0%8 != 0 { + return fmt.Errorf("bad stride %d", stride0) + } + if stride1 <= 0 || stride1%8 != 0 { + return fmt.Errorf("bad stride %d", stride1) + } + // Compare the two pix data, one 8x8 block at a time. + for y := 0; y < len(pix0)/stride0 && y < len(pix1)/stride1; y += 8 { + for x := 0; x < stride0 && x < stride1; x += 8 { + if x >= bounds.Max.X || y >= bounds.Max.Y { + // We don't care if the two pix data differ if the 8x8 block is + // entirely outside of the image's bounds. For example, this can + // occur with a 4:2:0 chroma subsampling and a 1x1 image. Baseline + // decoding works on the one 16x16 MCU as a whole; progressive + // decoding's first pass works on that 16x16 MCU as a whole but + // refinement passes only process one 8x8 block within the MCU. + continue + } + + for j := 0; j < 8; j++ { + for i := 0; i < 8; i++ { + index0 := (y+j)*stride0 + (x + i) + index1 := (y+j)*stride1 + (x + i) + if pix0[index0] != pix1[index1] { + return fmt.Errorf("blocks at (%d, %d) differ:\n%sand\n%s", x, y, + pixString(pix0, stride0, x, y), + pixString(pix1, stride1, x, y), + ) + } + } + } + } + } + return nil +} + +func pixString(pix []byte, stride, x, y int) string { + s := bytes.NewBuffer(nil) + for j := 0; j < 8; j++ { + fmt.Fprintf(s, "\t") + for i := 0; i < 8; i++ { + fmt.Fprintf(s, "%02x ", pix[(y+j)*stride+(x+i)]) + } + fmt.Fprintf(s, "\n") + } + return s.String() +} + +func TestTruncatedSOSDataDoesntPanic(t *testing.T) { + b, err := os.ReadFile("../testdata/video-005.gray.q50.jpeg") + if err != nil { + t.Fatal(err) + } + sosMarker := []byte{0xff, 0xda} + i := bytes.Index(b, sosMarker) + if i < 0 { + t.Fatal("SOS marker not found") + } + i += len(sosMarker) + j := i + 10 + if j > len(b) { + j = len(b) + } + for ; i < j; i++ { + Decode(bytes.NewReader(b[:i])) + } +} + +func TestLargeImageWithShortData(t *testing.T) { + // This input is an invalid JPEG image, based on the fuzzer-generated image + // in issue 10413. It is only 504 bytes, and shouldn't take long for Decode + // to return an error. The Start Of Frame marker gives the image dimensions + // as 8192 wide and 8192 high, so even if an unreadByteStuffedByte bug + // doesn't technically lead to an infinite loop, such a bug can still cause + // an unreasonably long loop for such a short input. + const input = "" + + "\xff\xd8\xff\xe0\x00\x10\x4a\x46\x49\x46\x00\x01\x01\x00\x00\x01" + + "\x00\x01\x00\x00\xff\xdb\x00\x43\x00\x10\x0b\x0c\x0e\x0c\x0a\x10" + + "\x0e\x89\x0e\x12\x11\x10\x13\x18\xff\xd8\xff\xe0\x00\x10\x4a\x46" + + "\x49\x46\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x43" + + "\x00\x10\x0b\x0c\x0e\x0c\x0a\x10\x0e\x0d\x0e\x12\x11\x10\x13\x18" + + "\x28\x1a\x18\x16\x16\x18\x31\x23\x25\x1d\x28\x3a\x33\x3d\x3c\x39" + + "\x33\x38\x37\x40\x48\x5c\x4e\x40\x44\x57\x45\x37\x38\x50\x6d\x51" + + "\x57\x5f\x62\x67\x68\x67\x3e\x4d\x71\x79\x70\x64\x78\x5c\x65\x67" + + "\x63\xff\xc0\x00\x0b\x08\x20\x00\x20\x00\x01\x01\x11\x00\xff\xc4" + + "\x00\x1f\x00\x00\x01\x05\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00" + + "\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\xff" + + "\xc4\x00\xb5\x10\x00\x02\x01\x03\x03\x02\x04\x03\x05\x05\x04\x04" + + "\x00\x00\x01\x7d\x01\x02\x03\x00\x04\x11\x05\x12\x21\x31\x01\x06" + + "\x13\x51\x61\x07\x22\x71\x14\x32\x81\x91\xa1\x08\x23\xd8\xff\xdd" + + "\x42\xb1\xc1\x15\x52\xd1\xf0\x24\x33\x62\x72\x82\x09\x0a\x16\x17" + + "\x18\x19\x1a\x25\x26\x27\x28\x29\x2a\x34\x35\x36\x37\x38\x39\x3a" + + "\x43\x44\x45\x46\x47\x48\x49\x4a\x53\x54\x55\x56\x57\x58\x59\x5a" + + "\x00\x63\x64\x65\x66\x67\x68\x69\x6a\x73\x74\x75\x76\x77\x78\x79" + + "\x7a\x83\x84\x85\x86\x87\x88\x89\x8a\x92\x93\x94\x95\x96\x97\x98" + + "\x99\x9a\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xb2\xb3\xb4\xb5\xb6" + + "\xb7\xb8\xb9\xba\xc2\xc3\xc4\xc5\xc6\xc7\xff\xd8\xff\xe0\x00\x10" + + "\x4a\x46\x49\x46\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb" + + "\x00\x43\x00\x10\x0b\x0c\x0e\x0c\x0a\x10\x0e\x0d\x0e\x12\x11\x10" + + "\x13\x18\x28\x1a\x18\x16\x16\x18\x31\x23\x25\x1d\xc8\xc9\xca\xd2" + + "\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8" + + "\xe9\xea\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xff\xda\x00\x08" + + "\x01\x01\x00\x00\x3f\x00\xb9\xeb\x50\xb0\xdb\xc8\xa8\xe4\x63\x80" + + "\xdd\x31\xd6\x9d\xbb\xf2\xc5\x42\x1f\x6c\x6f\xf4\x34\xdd\x3c\xfc" + + "\xac\xe7\x3d\x80\xa9\xcc\x87\x34\xb3\x37\xfa\x2b\x9f\x6a\xad\x63" + + "\x20\x36\x9f\x78\x64\x75\xe6\xab\x7d\xb2\xde\x29\x70\xd3\x20\x27" + + "\xde\xaf\xa4\xf0\xca\x9f\x24\xa8\xdf\x46\xa8\x24\x84\x96\xe3\x77" + + "\xf9\x2e\xe0\x0a\x62\x7f\xdf\xd9" + c := make(chan error, 1) + go func() { + _, err := Decode(strings.NewReader(input)) + c <- err + }() + select { + case err := <-c: + if err == nil { + t.Fatalf("got nil error, want non-nil") + } + case <-time.After(3 * time.Second): + t.Fatalf("timed out") + } +} + +func TestPaddedRSTMarker(t *testing.T) { + // This test image comes from golang.org/issue/28717 + const base64EncodedImage = ` +/9j/4AAhQVZJMQABAQEAeAB4AAAAAAAAAAAAAAAAAAAAAAAAAP/bAEMABAIDAwMCBAMDAwQEBAQGCgYG +BQUGDAgJBwoODA8PDgwODxASFxMQERURDQ4UGhQVFxgZGhkPExweHBkeFxkZGP/bAEMBBAQEBgUGCwYG +CxgQDhAYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGBgYGP/EAaIA +AAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKCxAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1Fh +ByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNk +ZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT +1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6AQADAQEBAQEBAQEBAAAAAAAAAQIDBAUGBwgJCgsRAAIB +AgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEHYXETIjKBCBRCkaGxwQkjM1LwFWJy0QoWJDThJfEXGBka +JicoKSo1Njc4OTpDREVGR0hJSlNUVVZXWFlaY2RlZmdoaWpzdHV2d3h5eoKDhIWGh4iJipKTlJWWl5iZ +mqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uLj5OXm5+jp6vLz9PX29/j5+v/dAAQA +Cv/gAAQAAP/AABEIALABQAMBIQACEQEDEQH/2gAMAwEAAhEDEQA/APnCFTk5BPPGKliAB718W7H2j3Ip +VUuwJxzTfKXacde9VBhYRUBAyO3pTmUAbSMU5WGmybywzHGAMdelPVFC+n1qXZCuyaJADxjj2qzbBMAP +xz1rKaVib6ltLcFvlIx2pLy0dwuAMMBnH1rFON9RNsszAZPFEYHldPzrOy3KewmBk9qUABugxjtTVmiW +xWRcjp+VJtHXgVL3K6AgBDdM9eRTNzAZViOe1VyxaJavuf/Q8aW4mUcSGpo764AyHz+FfnnJBvVH1UsN +CS1Q/wDte4Trip49ecA7g3FSqMW9zlqZandxJ4/EKADcSPqKni8QQMT865qOSUNjiqZdNbFiHWYXz84N +WE1KNsfMKj2zirHHPDSj0JFvo2H36d9pUjg1sqykYOm0KbgY60omXPXmr9pFkco3zBnrQzjGcnrRzp9S +bEbuOvao3fisZSXUpIYWGKGcbetTCSswsxnmACkYrtNSpJ2YNM//0fnK1BD7sDg9KmUHeOe/Svid3qfb +SdmQ3AHmnr1pGBC5z19a0hohNiJkensM1J0yCKmY0yZR82e+BT1BxnpmpepN9SRCR0NSpweOoPWs6isr +ijuWIZGBA/lVwzMVFY8ibuhXEfr+tOz8hIqUymhRnJGTSc5wBVRRDFPXBHJpB3qdmV0EX7vXmoyfl685 +p2dxWR//0vFsHZ9TQv3T618Bqz7PSwwn1phPXpSWrQEUhIx0NVXc7j0rSNwViCS4dWYpJj3BpBqVzGy7 +ZmHSq9kpblSpxkveQ+PX7uMf6wEDtU0fi24TAkX8jTeCjJaaHDUwFN7aFq28aL/GCMGrtr4xtHGGkA+t +YTy+a+E82eAa2LsXiWzI5mXPHercOsW8hwJB+dcUqVSCOKVFxdmiwl7E2MOPzp4nQ9GH51jzNbmUoOIC +TI4okOaUXoybDCevNBPHX8qIO4mf/9P52i4dix5zjp/n1qZFBCmviL6an2kt9CGcYnJznJpOBwegq4vQ +L9xIUytSkfu/bv70p7j6EnQgjHSpFGVqXclkkaHb1+makUHgdazm7IFuSKOasrnjis2+oDm9qnIHlgd/ +es7gxqjkt1NLwH4xTTEhjkhutM3D15oGhkcnBGRTDKu3A7H1rS3cLn//1PEhJ8uM557UvmDaa/P7a3Ps +xpZcZ6mo5WG45pdUC2K8ko5JIzWfcTqu7HPHrW9OLbKWhSluVLNz3wKrS3I3KfcV1Rg9CrpXK8l0F7io +pLnLnJHGOldMYJGMpu5XNwuxjyRTBcAAjd1HWtfZmPORy3WAWWQDOM4PWtHRru6DFlmY88ZqKsVyXaKp +QjOoa7axe28G/cWqhoHjO/n1WeJwSkS9c981wUcFCopPayFj8JC8VFbs6e38VldvmHHFaMHimAoCzDB6 +V5U8FKz5TlrZU4/CXYtdtnXIarEepW7jAcfnXGqEoKx5tfBzh0P/1fnqEAsc/wB6pI9owAD1618Qn3Ps +35EE4UzHrx79aXaMcdaqAMWIADvj271IMeXg59KUmNLQkUDfjb1FSLxzg0pWJRLGAQAeMVIoA+uaxlaw +0SoF/u1KowwwDUcwuo9wMjrUrY2ZPOKy0KY1T1NMdwG/CtBEFzMqnIPNUZ75FBJP5mtIQvYfoU21JFVs +N271AurRE/e611xw73Yj/9b50GsQhOXHWnpq8JX7w4PWvjPq76H2fzHjVYCud9Q3GrRAZDUvq75kNbMz +7vV0zjdjNZ82pqzMcj7tdlPDtIiVWKKct+AxwRxUbXi7VPJAIrZUdEZOsrsga8DFgelQtd98g5P6V0Qp +GE6qIUut2cZ470kd2FjYc4Oce1bSpJ3Rzxq21GNcDZhSeg710ujKRbKzAg5rkxceWnqd+XtOo7bD9cl8 +qxLDPHasXwUvmyXU7Lgl8cegrnw2lGbZ14l3rU0bl3gMQCRgVU1y7WytUZQzMRwBXPRhzWRvVny3ZW8N +6xPdXBikiZc5IOa6GG6nDsd5xnAyfaliqEacrGOHarx5pI//1/nuL754HWngEkYx1r4VWsfaMjk4mP8A 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+xjOa96xwWstD/9D451XAhBOOTxVRlURdOa8ymrI9epu2SW23cMgDHb1qw4BcrgY9KJ25kOn8LLFsArYG +McVIu3GdvOOTWLV2axeliOYgM+FzmoL1isAwME4GKVloDvqVoI9zEEAMMGrbIAmFUdcZrSbS0MqcWQBg +0WMg4PalhCFCdpHWiXUFZtaDtqhywBwMY9Ko6sR5oXPTn2p09WianVIyEYebwMEnPNTL5eXBA4Hautp6 +WONSWt0TQMhUgjKj1q5bhQWKMDwBxWE20mbws3ElXy9pUEDqMd6hfaHUgE7B2HtWUO7NKiVrI//R8Vj4 +br37VMuT9TX55HY+ze+gMM5PSkzwR1AoWu4IRRg9akPC8HpSlfRFLXYeCN3TkipV60ulmBJGeR71IvTP +Ws5K6Ghwp3FQkMH6elNJ461didOoq9SaRjxSjqwuVbgZkH1rzrxWwk8QXj9hIR+XFejl1nVt5EV/gM2I +qCTjPTH50x+eRxya961tzzt9j//S+O9WJ+zjgDmqJYGDJYZNedSSaPXqu0tew+L7wPTvmrBO5x7Y5qZf +EnYUPhZdhUZyO3pTgcOxGOR0rnbu7M6fhK9yVEvPy59O9QX75VBjnIoS+ETa95DLbdu6nnp7VYGSMk59 +vxrWemxlTZCvMe4BTg/nSRKHVsjGfpSe90C1VmTsG2H2x3rF1J1eVxgcHr+FVQWtyK7srFGAgOrHqDnp +7VPGNzO/O3kkCut7pnGno0idCCNyt6Crca5ZiDjpgVzXsnc6X71rDyBgcbtucn8KhjBMpOfrz7VlTdtT +Sqm7JH//2Q== +` + + data, err := base64.StdEncoding.DecodeString(base64EncodedImage) + if err != nil { + t.Fatalf("base64 DecodeString: %v", err) + } + if _, err = Decode(bytes.NewReader(data)); err != nil { + t.Fatalf("Decode: %v", err) + } +} + +func TestExtraneousData(t *testing.T) { + // Encode a 1x1 red image. + src := image.NewRGBA(image.Rect(0, 0, 1, 1)) + src.Set(0, 0, color.RGBA{0xff, 0x00, 0x00, 0xff}) + buf := new(bytes.Buffer) + if err := Encode(buf, src, nil); err != nil { + t.Fatalf("encode: %v", err) + } + enc := buf.String() + // Sanity check that the encoded JPEG is long enough, that it ends in a + // "\xff\xd9" EOI marker, and that it contains a "\xff\xda" SOS marker + // somewhere in the final 64 bytes. + if len(enc) < 64 { + t.Fatalf("encoded JPEG is too short: %d bytes", len(enc)) + } + if got, want := enc[len(enc)-2:], "\xff\xd9"; got != want { + t.Fatalf("encoded JPEG ends with %q, want %q", got, want) + } + if s := enc[len(enc)-64:]; !strings.Contains(s, "\xff\xda") { + t.Fatalf("encoded JPEG does not contain a SOS marker (ff da) near the end: % x", s) + } + // Test that adding some random junk between the SOS marker and the + // EOI marker does not affect the decoding. + rnd := rand.New(rand.NewSource(1)) + for i, nerr := 0, 0; i < 1000 && nerr < 10; i++ { + buf.Reset() + // Write all but the trailing "\xff\xd9" EOI marker. + buf.WriteString(enc[:len(enc)-2]) + // Write some random extraneous data. + for n := rnd.Intn(10); n > 0; n-- { + if x := byte(rnd.Intn(256)); x != 0xff { + buf.WriteByte(x) + } else { + // The JPEG format escapes a SOS 0xff data byte as "\xff\x00". + buf.WriteString("\xff\x00") + } + } + // Write the "\xff\xd9" EOI marker. + buf.WriteString("\xff\xd9") + + // Check that we can still decode the resultant image. + got, err := Decode(buf) + if err != nil { + t.Errorf("could not decode image #%d: %v", i, err) + nerr++ + continue + } + if got.Bounds() != src.Bounds() { + t.Errorf("image #%d, bounds differ: %v and %v", i, got.Bounds(), src.Bounds()) + nerr++ + continue + } + if averageDelta(got, src) > 2<<8 { + t.Errorf("image #%d changed too much after a round trip", i) + nerr++ + continue + } + } +} + +func benchmarkDecode(b *testing.B, filename string) { + data, err := os.ReadFile(filename) + if err != nil { + b.Fatal(err) + } + cfg, err := DecodeConfig(bytes.NewReader(data)) + if err != nil { + b.Fatal(err) + } + b.SetBytes(int64(cfg.Width * cfg.Height * 4)) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Decode(bytes.NewReader(data)) + } +} + +func BenchmarkDecodeBaseline(b *testing.B) { + benchmarkDecode(b, "../testdata/video-001.jpeg") +} + +func BenchmarkDecodeProgressive(b *testing.B) { + benchmarkDecode(b, "../testdata/video-001.progressive.jpeg") +} diff --git a/src/image/jpeg/scan.go b/src/image/jpeg/scan.go new file mode 100644 index 0000000..94f3d3a --- /dev/null +++ b/src/image/jpeg/scan.go @@ -0,0 +1,523 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "image" +) + +// makeImg allocates and initializes the destination image. +func (d *decoder) makeImg(mxx, myy int) { + if d.nComp == 1 { + m := image.NewGray(image.Rect(0, 0, 8*mxx, 8*myy)) + d.img1 = m.SubImage(image.Rect(0, 0, d.width, d.height)).(*image.Gray) + return + } + + h0 := d.comp[0].h + v0 := d.comp[0].v + hRatio := h0 / d.comp[1].h + vRatio := v0 / d.comp[1].v + var subsampleRatio image.YCbCrSubsampleRatio + switch hRatio<<4 | vRatio { + case 0x11: + subsampleRatio = image.YCbCrSubsampleRatio444 + case 0x12: + subsampleRatio = image.YCbCrSubsampleRatio440 + case 0x21: + subsampleRatio = image.YCbCrSubsampleRatio422 + case 0x22: + subsampleRatio = image.YCbCrSubsampleRatio420 + case 0x41: + subsampleRatio = image.YCbCrSubsampleRatio411 + case 0x42: + subsampleRatio = image.YCbCrSubsampleRatio410 + default: + panic("unreachable") + } + m := image.NewYCbCr(image.Rect(0, 0, 8*h0*mxx, 8*v0*myy), subsampleRatio) + d.img3 = m.SubImage(image.Rect(0, 0, d.width, d.height)).(*image.YCbCr) + + if d.nComp == 4 { + h3, v3 := d.comp[3].h, d.comp[3].v + d.blackPix = make([]byte, 8*h3*mxx*8*v3*myy) + d.blackStride = 8 * h3 * mxx + } +} + +// Specified in section B.2.3. +func (d *decoder) processSOS(n int) error { + if d.nComp == 0 { + return FormatError("missing SOF marker") + } + if n < 6 || 4+2*d.nComp < n || n%2 != 0 { + return FormatError("SOS has wrong length") + } + if err := d.readFull(d.tmp[:n]); err != nil { + return err + } + nComp := int(d.tmp[0]) + if n != 4+2*nComp { + return FormatError("SOS length inconsistent with number of components") + } + var scan [maxComponents]struct { + compIndex uint8 + td uint8 // DC table selector. + ta uint8 // AC table selector. + } + totalHV := 0 + for i := 0; i < nComp; i++ { + cs := d.tmp[1+2*i] // Component selector. + compIndex := -1 + for j, comp := range d.comp[:d.nComp] { + if cs == comp.c { + compIndex = j + } + } + if compIndex < 0 { + return FormatError("unknown component selector") + } + scan[i].compIndex = uint8(compIndex) + // Section B.2.3 states that "the value of Cs_j shall be different from + // the values of Cs_1 through Cs_(j-1)". Since we have previously + // verified that a frame's component identifiers (C_i values in section + // B.2.2) are unique, it suffices to check that the implicit indexes + // into d.comp are unique. + for j := 0; j < i; j++ { + if scan[i].compIndex == scan[j].compIndex { + return FormatError("repeated component selector") + } + } + totalHV += d.comp[compIndex].h * d.comp[compIndex].v + + // The baseline t <= 1 restriction is specified in table B.3. + scan[i].td = d.tmp[2+2*i] >> 4 + if t := scan[i].td; t > maxTh || (d.baseline && t > 1) { + return FormatError("bad Td value") + } + scan[i].ta = d.tmp[2+2*i] & 0x0f + if t := scan[i].ta; t > maxTh || (d.baseline && t > 1) { + return FormatError("bad Ta value") + } + } + // Section B.2.3 states that if there is more than one component then the + // total H*V values in a scan must be <= 10. + if d.nComp > 1 && totalHV > 10 { + return FormatError("total sampling factors too large") + } + + // zigStart and zigEnd are the spectral selection bounds. + // ah and al are the successive approximation high and low values. + // The spec calls these values Ss, Se, Ah and Al. + // + // For progressive JPEGs, these are the two more-or-less independent + // aspects of progression. Spectral selection progression is when not + // all of a block's 64 DCT coefficients are transmitted in one pass. + // For example, three passes could transmit coefficient 0 (the DC + // component), coefficients 1-5, and coefficients 6-63, in zig-zag + // order. Successive approximation is when not all of the bits of a + // band of coefficients are transmitted in one pass. For example, + // three passes could transmit the 6 most significant bits, followed + // by the second-least significant bit, followed by the least + // significant bit. + // + // For sequential JPEGs, these parameters are hard-coded to 0/63/0/0, as + // per table B.3. + zigStart, zigEnd, ah, al := int32(0), int32(blockSize-1), uint32(0), uint32(0) + if d.progressive { + zigStart = int32(d.tmp[1+2*nComp]) + zigEnd = int32(d.tmp[2+2*nComp]) + ah = uint32(d.tmp[3+2*nComp] >> 4) + al = uint32(d.tmp[3+2*nComp] & 0x0f) + if (zigStart == 0 && zigEnd != 0) || zigStart > zigEnd || blockSize <= zigEnd { + return FormatError("bad spectral selection bounds") + } + if zigStart != 0 && nComp != 1 { + return FormatError("progressive AC coefficients for more than one component") + } + if ah != 0 && ah != al+1 { + return FormatError("bad successive approximation values") + } + } + + // mxx and myy are the number of MCUs (Minimum Coded Units) in the image. + h0, v0 := d.comp[0].h, d.comp[0].v // The h and v values from the Y components. + mxx := (d.width + 8*h0 - 1) / (8 * h0) + myy := (d.height + 8*v0 - 1) / (8 * v0) + if d.img1 == nil && d.img3 == nil { + d.makeImg(mxx, myy) + } + if d.progressive { + for i := 0; i < nComp; i++ { + compIndex := scan[i].compIndex + if d.progCoeffs[compIndex] == nil { + d.progCoeffs[compIndex] = make([]block, mxx*myy*d.comp[compIndex].h*d.comp[compIndex].v) + } + } + } + + d.bits = bits{} + mcu, expectedRST := 0, uint8(rst0Marker) + var ( + // b is the decoded coefficients, in natural (not zig-zag) order. + b block + dc [maxComponents]int32 + // bx and by are the location of the current block, in units of 8x8 + // blocks: the third block in the first row has (bx, by) = (2, 0). + bx, by int + blockCount int + ) + for my := 0; my < myy; my++ { + for mx := 0; mx < mxx; mx++ { + for i := 0; i < nComp; i++ { + compIndex := scan[i].compIndex + hi := d.comp[compIndex].h + vi := d.comp[compIndex].v + for j := 0; j < hi*vi; j++ { + // The blocks are traversed one MCU at a time. For 4:2:0 chroma + // subsampling, there are four Y 8x8 blocks in every 16x16 MCU. + // + // For a sequential 32x16 pixel image, the Y blocks visiting order is: + // 0 1 4 5 + // 2 3 6 7 + // + // For progressive images, the interleaved scans (those with nComp > 1) + // are traversed as above, but non-interleaved scans are traversed left + // to right, top to bottom: + // 0 1 2 3 + // 4 5 6 7 + // Only DC scans (zigStart == 0) can be interleaved. AC scans must have + // only one component. + // + // To further complicate matters, for non-interleaved scans, there is no + // data for any blocks that are inside the image at the MCU level but + // outside the image at the pixel level. For example, a 24x16 pixel 4:2:0 + // progressive image consists of two 16x16 MCUs. The interleaved scans + // will process 8 Y blocks: + // 0 1 4 5 + // 2 3 6 7 + // The non-interleaved scans will process only 6 Y blocks: + // 0 1 2 + // 3 4 5 + if nComp != 1 { + bx = hi*mx + j%hi + by = vi*my + j/hi + } else { + q := mxx * hi + bx = blockCount % q + by = blockCount / q + blockCount++ + if bx*8 >= d.width || by*8 >= d.height { + continue + } + } + + // Load the previous partially decoded coefficients, if applicable. + if d.progressive { + b = d.progCoeffs[compIndex][by*mxx*hi+bx] + } else { + b = block{} + } + + if ah != 0 { + if err := d.refine(&b, &d.huff[acTable][scan[i].ta], zigStart, zigEnd, 1<<al); err != nil { + return err + } + } else { + zig := zigStart + if zig == 0 { + zig++ + // Decode the DC coefficient, as specified in section F.2.2.1. + value, err := d.decodeHuffman(&d.huff[dcTable][scan[i].td]) + if err != nil { + return err + } + if value > 16 { + return UnsupportedError("excessive DC component") + } + dcDelta, err := d.receiveExtend(value) + if err != nil { + return err + } + dc[compIndex] += dcDelta + b[0] = dc[compIndex] << al + } + + if zig <= zigEnd && d.eobRun > 0 { + d.eobRun-- + } else { + // Decode the AC coefficients, as specified in section F.2.2.2. + huff := &d.huff[acTable][scan[i].ta] + for ; zig <= zigEnd; zig++ { + value, err := d.decodeHuffman(huff) + if err != nil { + return err + } + val0 := value >> 4 + val1 := value & 0x0f + if val1 != 0 { + zig += int32(val0) + if zig > zigEnd { + break + } + ac, err := d.receiveExtend(val1) + if err != nil { + return err + } + b[unzig[zig]] = ac << al + } else { + if val0 != 0x0f { + d.eobRun = uint16(1 << val0) + if val0 != 0 { + bits, err := d.decodeBits(int32(val0)) + if err != nil { + return err + } + d.eobRun |= uint16(bits) + } + d.eobRun-- + break + } + zig += 0x0f + } + } + } + } + + if d.progressive { + // Save the coefficients. + d.progCoeffs[compIndex][by*mxx*hi+bx] = b + // At this point, we could call reconstructBlock to dequantize and perform the + // inverse DCT, to save early stages of a progressive image to the *image.YCbCr + // buffers (the whole point of progressive encoding), but in Go, the jpeg.Decode + // function does not return until the entire image is decoded, so we "continue" + // here to avoid wasted computation. Instead, reconstructBlock is called on each + // accumulated block by the reconstructProgressiveImage method after all of the + // SOS markers are processed. + continue + } + if err := d.reconstructBlock(&b, bx, by, int(compIndex)); err != nil { + return err + } + } // for j + } // for i + mcu++ + if d.ri > 0 && mcu%d.ri == 0 && mcu < mxx*myy { + // A more sophisticated decoder could use RST[0-7] markers to resynchronize from corrupt input, + // but this one assumes well-formed input, and hence the restart marker follows immediately. + if err := d.readFull(d.tmp[:2]); err != nil { + return err + } + + // Section F.1.2.3 says that "Byte alignment of markers is + // achieved by padding incomplete bytes with 1-bits. If padding + // with 1-bits creates a X’FF’ value, a zero byte is stuffed + // before adding the marker." + // + // Seeing "\xff\x00" here is not spec compliant, as we are not + // expecting an *incomplete* byte (that needed padding). Still, + // some real world encoders (see golang.org/issue/28717) insert + // it, so we accept it and re-try the 2 byte read. + // + // libjpeg issues a warning (but not an error) for this: + // https://github.com/LuaDist/libjpeg/blob/6c0fcb8ddee365e7abc4d332662b06900612e923/jdmarker.c#L1041-L1046 + if d.tmp[0] == 0xff && d.tmp[1] == 0x00 { + if err := d.readFull(d.tmp[:2]); err != nil { + return err + } + } + + if d.tmp[0] != 0xff || d.tmp[1] != expectedRST { + return FormatError("bad RST marker") + } + expectedRST++ + if expectedRST == rst7Marker+1 { + expectedRST = rst0Marker + } + // Reset the Huffman decoder. + d.bits = bits{} + // Reset the DC components, as per section F.2.1.3.1. + dc = [maxComponents]int32{} + // Reset the progressive decoder state, as per section G.1.2.2. + d.eobRun = 0 + } + } // for mx + } // for my + + return nil +} + +// refine decodes a successive approximation refinement block, as specified in +// section G.1.2. +func (d *decoder) refine(b *block, h *huffman, zigStart, zigEnd, delta int32) error { + // Refining a DC component is trivial. + if zigStart == 0 { + if zigEnd != 0 { + panic("unreachable") + } + bit, err := d.decodeBit() + if err != nil { + return err + } + if bit { + b[0] |= delta + } + return nil + } + + // Refining AC components is more complicated; see sections G.1.2.2 and G.1.2.3. + zig := zigStart + if d.eobRun == 0 { + loop: + for ; zig <= zigEnd; zig++ { + z := int32(0) + value, err := d.decodeHuffman(h) + if err != nil { + return err + } + val0 := value >> 4 + val1 := value & 0x0f + + switch val1 { + case 0: + if val0 != 0x0f { + d.eobRun = uint16(1 << val0) + if val0 != 0 { + bits, err := d.decodeBits(int32(val0)) + if err != nil { + return err + } + d.eobRun |= uint16(bits) + } + break loop + } + case 1: + z = delta + bit, err := d.decodeBit() + if err != nil { + return err + } + if !bit { + z = -z + } + default: + return FormatError("unexpected Huffman code") + } + + zig, err = d.refineNonZeroes(b, zig, zigEnd, int32(val0), delta) + if err != nil { + return err + } + if zig > zigEnd { + return FormatError("too many coefficients") + } + if z != 0 { + b[unzig[zig]] = z + } + } + } + if d.eobRun > 0 { + d.eobRun-- + if _, err := d.refineNonZeroes(b, zig, zigEnd, -1, delta); err != nil { + return err + } + } + return nil +} + +// refineNonZeroes refines non-zero entries of b in zig-zag order. If nz >= 0, +// the first nz zero entries are skipped over. +func (d *decoder) refineNonZeroes(b *block, zig, zigEnd, nz, delta int32) (int32, error) { + for ; zig <= zigEnd; zig++ { + u := unzig[zig] + if b[u] == 0 { + if nz == 0 { + break + } + nz-- + continue + } + bit, err := d.decodeBit() + if err != nil { + return 0, err + } + if !bit { + continue + } + if b[u] >= 0 { + b[u] += delta + } else { + b[u] -= delta + } + } + return zig, nil +} + +func (d *decoder) reconstructProgressiveImage() error { + // The h0, mxx, by and bx variables have the same meaning as in the + // processSOS method. + h0 := d.comp[0].h + mxx := (d.width + 8*h0 - 1) / (8 * h0) + for i := 0; i < d.nComp; i++ { + if d.progCoeffs[i] == nil { + continue + } + v := 8 * d.comp[0].v / d.comp[i].v + h := 8 * d.comp[0].h / d.comp[i].h + stride := mxx * d.comp[i].h + for by := 0; by*v < d.height; by++ { + for bx := 0; bx*h < d.width; bx++ { + if err := d.reconstructBlock(&d.progCoeffs[i][by*stride+bx], bx, by, i); err != nil { + return err + } + } + } + } + return nil +} + +// reconstructBlock dequantizes, performs the inverse DCT and stores the block +// to the image. +func (d *decoder) reconstructBlock(b *block, bx, by, compIndex int) error { + qt := &d.quant[d.comp[compIndex].tq] + for zig := 0; zig < blockSize; zig++ { + b[unzig[zig]] *= qt[zig] + } + idct(b) + dst, stride := []byte(nil), 0 + if d.nComp == 1 { + dst, stride = d.img1.Pix[8*(by*d.img1.Stride+bx):], d.img1.Stride + } else { + switch compIndex { + case 0: + dst, stride = d.img3.Y[8*(by*d.img3.YStride+bx):], d.img3.YStride + case 1: + dst, stride = d.img3.Cb[8*(by*d.img3.CStride+bx):], d.img3.CStride + case 2: + dst, stride = d.img3.Cr[8*(by*d.img3.CStride+bx):], d.img3.CStride + case 3: + dst, stride = d.blackPix[8*(by*d.blackStride+bx):], d.blackStride + default: + return UnsupportedError("too many components") + } + } + // Level shift by +128, clip to [0, 255], and write to dst. + for y := 0; y < 8; y++ { + y8 := y * 8 + yStride := y * stride + for x := 0; x < 8; x++ { + c := b[y8+x] + if c < -128 { + c = 0 + } else if c > 127 { + c = 255 + } else { + c += 128 + } + dst[yStride+x] = uint8(c) + } + } + return nil +} diff --git a/src/image/jpeg/writer.go b/src/image/jpeg/writer.go new file mode 100644 index 0000000..a600499 --- /dev/null +++ b/src/image/jpeg/writer.go @@ -0,0 +1,641 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "bufio" + "errors" + "image" + "image/color" + "io" +) + +// min returns the minimum of two integers. +func min(x, y int) int { + if x < y { + return x + } + return y +} + +// div returns a/b rounded to the nearest integer, instead of rounded to zero. +func div(a, b int32) int32 { + if a >= 0 { + return (a + (b >> 1)) / b + } + return -((-a + (b >> 1)) / b) +} + +// bitCount counts the number of bits needed to hold an integer. +var bitCount = [256]byte{ + 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, +} + +type quantIndex int + +const ( + quantIndexLuminance quantIndex = iota + quantIndexChrominance + nQuantIndex +) + +// unscaledQuant are the unscaled quantization tables in zig-zag order. Each +// encoder copies and scales the tables according to its quality parameter. +// The values are derived from section K.1 after converting from natural to +// zig-zag order. +var unscaledQuant = [nQuantIndex][blockSize]byte{ + // Luminance. + { + 16, 11, 12, 14, 12, 10, 16, 14, + 13, 14, 18, 17, 16, 19, 24, 40, + 26, 24, 22, 22, 24, 49, 35, 37, + 29, 40, 58, 51, 61, 60, 57, 51, + 56, 55, 64, 72, 92, 78, 64, 68, + 87, 69, 55, 56, 80, 109, 81, 87, + 95, 98, 103, 104, 103, 62, 77, 113, + 121, 112, 100, 120, 92, 101, 103, 99, + }, + // Chrominance. + { + 17, 18, 18, 24, 21, 24, 47, 26, + 26, 47, 99, 66, 56, 66, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + }, +} + +type huffIndex int + +const ( + huffIndexLuminanceDC huffIndex = iota + huffIndexLuminanceAC + huffIndexChrominanceDC + huffIndexChrominanceAC + nHuffIndex +) + +// huffmanSpec specifies a Huffman encoding. +type huffmanSpec struct { + // count[i] is the number of codes of length i bits. + count [16]byte + // value[i] is the decoded value of the i'th codeword. + value []byte +} + +// theHuffmanSpec is the Huffman encoding specifications. +// This encoder uses the same Huffman encoding for all images. +var theHuffmanSpec = [nHuffIndex]huffmanSpec{ + // Luminance DC. + { + [16]byte{0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0}, + []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}, + }, + // Luminance AC. + { + [16]byte{0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125}, + []byte{ + 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, + 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, + 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, + 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, + 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, + 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, + 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, + 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, + 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, + 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, + 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, + 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, + 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, + 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, + 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, + 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, + 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, + 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, + 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, + 0xf9, 0xfa, + }, + }, + // Chrominance DC. + { + [16]byte{0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0}, + []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}, + }, + // Chrominance AC. + { + [16]byte{0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119}, + []byte{ + 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, + 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, + 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, + 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, + 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, + 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, + 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, + 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, + 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, + 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, + 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, + 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, + 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, + 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, + 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, + 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, + 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, + 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, + 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, + 0xf9, 0xfa, + }, + }, +} + +// huffmanLUT is a compiled look-up table representation of a huffmanSpec. +// Each value maps to a uint32 of which the 8 most significant bits hold the +// codeword size in bits and the 24 least significant bits hold the codeword. +// The maximum codeword size is 16 bits. +type huffmanLUT []uint32 + +func (h *huffmanLUT) init(s huffmanSpec) { + maxValue := 0 + for _, v := range s.value { + if int(v) > maxValue { + maxValue = int(v) + } + } + *h = make([]uint32, maxValue+1) + code, k := uint32(0), 0 + for i := 0; i < len(s.count); i++ { + nBits := uint32(i+1) << 24 + for j := uint8(0); j < s.count[i]; j++ { + (*h)[s.value[k]] = nBits | code + code++ + k++ + } + code <<= 1 + } +} + +// theHuffmanLUT are compiled representations of theHuffmanSpec. +var theHuffmanLUT [4]huffmanLUT + +func init() { + for i, s := range theHuffmanSpec { + theHuffmanLUT[i].init(s) + } +} + +// writer is a buffered writer. +type writer interface { + Flush() error + io.Writer + io.ByteWriter +} + +// encoder encodes an image to the JPEG format. +type encoder struct { + // w is the writer to write to. err is the first error encountered during + // writing. All attempted writes after the first error become no-ops. + w writer + err error + // buf is a scratch buffer. + buf [16]byte + // bits and nBits are accumulated bits to write to w. + bits, nBits uint32 + // quant is the scaled quantization tables, in zig-zag order. + quant [nQuantIndex][blockSize]byte +} + +func (e *encoder) flush() { + if e.err != nil { + return + } + e.err = e.w.Flush() +} + +func (e *encoder) write(p []byte) { + if e.err != nil { + return + } + _, e.err = e.w.Write(p) +} + +func (e *encoder) writeByte(b byte) { + if e.err != nil { + return + } + e.err = e.w.WriteByte(b) +} + +// emit emits the least significant nBits bits of bits to the bit-stream. +// The precondition is bits < 1<<nBits && nBits <= 16. +func (e *encoder) emit(bits, nBits uint32) { + nBits += e.nBits + bits <<= 32 - nBits + bits |= e.bits + for nBits >= 8 { + b := uint8(bits >> 24) + e.writeByte(b) + if b == 0xff { + e.writeByte(0x00) + } + bits <<= 8 + nBits -= 8 + } + e.bits, e.nBits = bits, nBits +} + +// emitHuff emits the given value with the given Huffman encoder. +func (e *encoder) emitHuff(h huffIndex, value int32) { + x := theHuffmanLUT[h][value] + e.emit(x&(1<<24-1), x>>24) +} + +// emitHuffRLE emits a run of runLength copies of value encoded with the given +// Huffman encoder. +func (e *encoder) emitHuffRLE(h huffIndex, runLength, value int32) { + a, b := value, value + if a < 0 { + a, b = -value, value-1 + } + var nBits uint32 + if a < 0x100 { + nBits = uint32(bitCount[a]) + } else { + nBits = 8 + uint32(bitCount[a>>8]) + } + e.emitHuff(h, runLength<<4|int32(nBits)) + if nBits > 0 { + e.emit(uint32(b)&(1<<nBits-1), nBits) + } +} + +// writeMarkerHeader writes the header for a marker with the given length. +func (e *encoder) writeMarkerHeader(marker uint8, markerlen int) { + e.buf[0] = 0xff + e.buf[1] = marker + e.buf[2] = uint8(markerlen >> 8) + e.buf[3] = uint8(markerlen & 0xff) + e.write(e.buf[:4]) +} + +// writeDQT writes the Define Quantization Table marker. +func (e *encoder) writeDQT() { + const markerlen = 2 + int(nQuantIndex)*(1+blockSize) + e.writeMarkerHeader(dqtMarker, markerlen) + for i := range e.quant { + e.writeByte(uint8(i)) + e.write(e.quant[i][:]) + } +} + +// writeSOF0 writes the Start Of Frame (Baseline Sequential) marker. +func (e *encoder) writeSOF0(size image.Point, nComponent int) { + markerlen := 8 + 3*nComponent + e.writeMarkerHeader(sof0Marker, markerlen) + e.buf[0] = 8 // 8-bit color. + e.buf[1] = uint8(size.Y >> 8) + e.buf[2] = uint8(size.Y & 0xff) + e.buf[3] = uint8(size.X >> 8) + e.buf[4] = uint8(size.X & 0xff) + e.buf[5] = uint8(nComponent) + if nComponent == 1 { + e.buf[6] = 1 + // No subsampling for grayscale image. + e.buf[7] = 0x11 + e.buf[8] = 0x00 + } else { + for i := 0; i < nComponent; i++ { + e.buf[3*i+6] = uint8(i + 1) + // We use 4:2:0 chroma subsampling. + e.buf[3*i+7] = "\x22\x11\x11"[i] + e.buf[3*i+8] = "\x00\x01\x01"[i] + } + } + e.write(e.buf[:3*(nComponent-1)+9]) +} + +// writeDHT writes the Define Huffman Table marker. +func (e *encoder) writeDHT(nComponent int) { + markerlen := 2 + specs := theHuffmanSpec[:] + if nComponent == 1 { + // Drop the Chrominance tables. + specs = specs[:2] + } + for _, s := range specs { + markerlen += 1 + 16 + len(s.value) + } + e.writeMarkerHeader(dhtMarker, markerlen) + for i, s := range specs { + e.writeByte("\x00\x10\x01\x11"[i]) + e.write(s.count[:]) + e.write(s.value) + } +} + +// writeBlock writes a block of pixel data using the given quantization table, +// returning the post-quantized DC value of the DCT-transformed block. b is in +// natural (not zig-zag) order. +func (e *encoder) writeBlock(b *block, q quantIndex, prevDC int32) int32 { + fdct(b) + // Emit the DC delta. + dc := div(b[0], 8*int32(e.quant[q][0])) + e.emitHuffRLE(huffIndex(2*q+0), 0, dc-prevDC) + // Emit the AC components. + h, runLength := huffIndex(2*q+1), int32(0) + for zig := 1; zig < blockSize; zig++ { + ac := div(b[unzig[zig]], 8*int32(e.quant[q][zig])) + if ac == 0 { + runLength++ + } else { + for runLength > 15 { + e.emitHuff(h, 0xf0) + runLength -= 16 + } + e.emitHuffRLE(h, runLength, ac) + runLength = 0 + } + } + if runLength > 0 { + e.emitHuff(h, 0x00) + } + return dc +} + +// toYCbCr converts the 8x8 region of m whose top-left corner is p to its +// YCbCr values. +func toYCbCr(m image.Image, p image.Point, yBlock, cbBlock, crBlock *block) { + b := m.Bounds() + xmax := b.Max.X - 1 + ymax := b.Max.Y - 1 + for j := 0; j < 8; j++ { + for i := 0; i < 8; i++ { + r, g, b, _ := m.At(min(p.X+i, xmax), min(p.Y+j, ymax)).RGBA() + yy, cb, cr := color.RGBToYCbCr(uint8(r>>8), uint8(g>>8), uint8(b>>8)) + yBlock[8*j+i] = int32(yy) + cbBlock[8*j+i] = int32(cb) + crBlock[8*j+i] = int32(cr) + } + } +} + +// grayToY stores the 8x8 region of m whose top-left corner is p in yBlock. +func grayToY(m *image.Gray, p image.Point, yBlock *block) { + b := m.Bounds() + xmax := b.Max.X - 1 + ymax := b.Max.Y - 1 + pix := m.Pix + for j := 0; j < 8; j++ { + for i := 0; i < 8; i++ { + idx := m.PixOffset(min(p.X+i, xmax), min(p.Y+j, ymax)) + yBlock[8*j+i] = int32(pix[idx]) + } + } +} + +// rgbaToYCbCr is a specialized version of toYCbCr for image.RGBA images. +func rgbaToYCbCr(m *image.RGBA, p image.Point, yBlock, cbBlock, crBlock *block) { + b := m.Bounds() + xmax := b.Max.X - 1 + ymax := b.Max.Y - 1 + for j := 0; j < 8; j++ { + sj := p.Y + j + if sj > ymax { + sj = ymax + } + offset := (sj-b.Min.Y)*m.Stride - b.Min.X*4 + for i := 0; i < 8; i++ { + sx := p.X + i + if sx > xmax { + sx = xmax + } + pix := m.Pix[offset+sx*4:] + yy, cb, cr := color.RGBToYCbCr(pix[0], pix[1], pix[2]) + yBlock[8*j+i] = int32(yy) + cbBlock[8*j+i] = int32(cb) + crBlock[8*j+i] = int32(cr) + } + } +} + +// yCbCrToYCbCr is a specialized version of toYCbCr for image.YCbCr images. +func yCbCrToYCbCr(m *image.YCbCr, p image.Point, yBlock, cbBlock, crBlock *block) { + b := m.Bounds() + xmax := b.Max.X - 1 + ymax := b.Max.Y - 1 + for j := 0; j < 8; j++ { + sy := p.Y + j + if sy > ymax { + sy = ymax + } + for i := 0; i < 8; i++ { + sx := p.X + i + if sx > xmax { + sx = xmax + } + yi := m.YOffset(sx, sy) + ci := m.COffset(sx, sy) + yBlock[8*j+i] = int32(m.Y[yi]) + cbBlock[8*j+i] = int32(m.Cb[ci]) + crBlock[8*j+i] = int32(m.Cr[ci]) + } + } +} + +// scale scales the 16x16 region represented by the 4 src blocks to the 8x8 +// dst block. +func scale(dst *block, src *[4]block) { + for i := 0; i < 4; i++ { + dstOff := (i&2)<<4 | (i&1)<<2 + for y := 0; y < 4; y++ { + for x := 0; x < 4; x++ { + j := 16*y + 2*x + sum := src[i][j] + src[i][j+1] + src[i][j+8] + src[i][j+9] + dst[8*y+x+dstOff] = (sum + 2) >> 2 + } + } + } +} + +// sosHeaderY is the SOS marker "\xff\xda" followed by 8 bytes: +// - the marker length "\x00\x08", +// - the number of components "\x01", +// - component 1 uses DC table 0 and AC table 0 "\x01\x00", +// - the bytes "\x00\x3f\x00". Section B.2.3 of the spec says that for +// sequential DCTs, those bytes (8-bit Ss, 8-bit Se, 4-bit Ah, 4-bit Al) +// should be 0x00, 0x3f, 0x00<<4 | 0x00. +var sosHeaderY = []byte{ + 0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00, 0x00, 0x3f, 0x00, +} + +// sosHeaderYCbCr is the SOS marker "\xff\xda" followed by 12 bytes: +// - the marker length "\x00\x0c", +// - the number of components "\x03", +// - component 1 uses DC table 0 and AC table 0 "\x01\x00", +// - component 2 uses DC table 1 and AC table 1 "\x02\x11", +// - component 3 uses DC table 1 and AC table 1 "\x03\x11", +// - the bytes "\x00\x3f\x00". Section B.2.3 of the spec says that for +// sequential DCTs, those bytes (8-bit Ss, 8-bit Se, 4-bit Ah, 4-bit Al) +// should be 0x00, 0x3f, 0x00<<4 | 0x00. +var sosHeaderYCbCr = []byte{ + 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, + 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, +} + +// writeSOS writes the StartOfScan marker. +func (e *encoder) writeSOS(m image.Image) { + switch m.(type) { + case *image.Gray: + e.write(sosHeaderY) + default: + e.write(sosHeaderYCbCr) + } + var ( + // Scratch buffers to hold the YCbCr values. + // The blocks are in natural (not zig-zag) order. + b block + cb, cr [4]block + // DC components are delta-encoded. + prevDCY, prevDCCb, prevDCCr int32 + ) + bounds := m.Bounds() + switch m := m.(type) { + // TODO(wathiede): switch on m.ColorModel() instead of type. + case *image.Gray: + for y := bounds.Min.Y; y < bounds.Max.Y; y += 8 { + for x := bounds.Min.X; x < bounds.Max.X; x += 8 { + p := image.Pt(x, y) + grayToY(m, p, &b) + prevDCY = e.writeBlock(&b, 0, prevDCY) + } + } + default: + rgba, _ := m.(*image.RGBA) + ycbcr, _ := m.(*image.YCbCr) + for y := bounds.Min.Y; y < bounds.Max.Y; y += 16 { + for x := bounds.Min.X; x < bounds.Max.X; x += 16 { + for i := 0; i < 4; i++ { + xOff := (i & 1) * 8 + yOff := (i & 2) * 4 + p := image.Pt(x+xOff, y+yOff) + if rgba != nil { + rgbaToYCbCr(rgba, p, &b, &cb[i], &cr[i]) + } else if ycbcr != nil { + yCbCrToYCbCr(ycbcr, p, &b, &cb[i], &cr[i]) + } else { + toYCbCr(m, p, &b, &cb[i], &cr[i]) + } + prevDCY = e.writeBlock(&b, 0, prevDCY) + } + scale(&b, &cb) + prevDCCb = e.writeBlock(&b, 1, prevDCCb) + scale(&b, &cr) + prevDCCr = e.writeBlock(&b, 1, prevDCCr) + } + } + } + // Pad the last byte with 1's. + e.emit(0x7f, 7) +} + +// DefaultQuality is the default quality encoding parameter. +const DefaultQuality = 75 + +// Options are the encoding parameters. +// Quality ranges from 1 to 100 inclusive, higher is better. +type Options struct { + Quality int +} + +// Encode writes the Image m to w in JPEG 4:2:0 baseline format with the given +// options. Default parameters are used if a nil *Options is passed. +func Encode(w io.Writer, m image.Image, o *Options) error { + b := m.Bounds() + if b.Dx() >= 1<<16 || b.Dy() >= 1<<16 { + return errors.New("jpeg: image is too large to encode") + } + var e encoder + if ww, ok := w.(writer); ok { + e.w = ww + } else { + e.w = bufio.NewWriter(w) + } + // Clip quality to [1, 100]. + quality := DefaultQuality + if o != nil { + quality = o.Quality + if quality < 1 { + quality = 1 + } else if quality > 100 { + quality = 100 + } + } + // Convert from a quality rating to a scaling factor. + var scale int + if quality < 50 { + scale = 5000 / quality + } else { + scale = 200 - quality*2 + } + // Initialize the quantization tables. + for i := range e.quant { + for j := range e.quant[i] { + x := int(unscaledQuant[i][j]) + x = (x*scale + 50) / 100 + if x < 1 { + x = 1 + } else if x > 255 { + x = 255 + } + e.quant[i][j] = uint8(x) + } + } + // Compute number of components based on input image type. + nComponent := 3 + switch m.(type) { + // TODO(wathiede): switch on m.ColorModel() instead of type. + case *image.Gray: + nComponent = 1 + } + // Write the Start Of Image marker. + e.buf[0] = 0xff + e.buf[1] = 0xd8 + e.write(e.buf[:2]) + // Write the quantization tables. + e.writeDQT() + // Write the image dimensions. + e.writeSOF0(b.Size(), nComponent) + // Write the Huffman tables. + e.writeDHT(nComponent) + // Write the image data. + e.writeSOS(m) + // Write the End Of Image marker. + e.buf[0] = 0xff + e.buf[1] = 0xd9 + e.write(e.buf[:2]) + e.flush() + return e.err +} diff --git a/src/image/jpeg/writer_test.go b/src/image/jpeg/writer_test.go new file mode 100644 index 0000000..abd5e32 --- /dev/null +++ b/src/image/jpeg/writer_test.go @@ -0,0 +1,288 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package jpeg + +import ( + "bytes" + "fmt" + "image" + "image/color" + "image/png" + "io" + "math/rand" + "os" + "testing" +) + +// zigzag maps from the natural ordering to the zig-zag ordering. For example, +// zigzag[0*8 + 3] is the zig-zag sequence number of the element in the fourth +// column and first row. +var zigzag = [blockSize]int{ + 0, 1, 5, 6, 14, 15, 27, 28, + 2, 4, 7, 13, 16, 26, 29, 42, + 3, 8, 12, 17, 25, 30, 41, 43, + 9, 11, 18, 24, 31, 40, 44, 53, + 10, 19, 23, 32, 39, 45, 52, 54, + 20, 22, 33, 38, 46, 51, 55, 60, + 21, 34, 37, 47, 50, 56, 59, 61, + 35, 36, 48, 49, 57, 58, 62, 63, +} + +func TestZigUnzig(t *testing.T) { + for i := 0; i < blockSize; i++ { + if unzig[zigzag[i]] != i { + t.Errorf("unzig[zigzag[%d]] == %d", i, unzig[zigzag[i]]) + } + if zigzag[unzig[i]] != i { + t.Errorf("zigzag[unzig[%d]] == %d", i, zigzag[unzig[i]]) + } + } +} + +// unscaledQuantInNaturalOrder are the unscaled quantization tables in +// natural (not zig-zag) order, as specified in section K.1. +var unscaledQuantInNaturalOrder = [nQuantIndex][blockSize]byte{ + // Luminance. + { + 16, 11, 10, 16, 24, 40, 51, 61, + 12, 12, 14, 19, 26, 58, 60, 55, + 14, 13, 16, 24, 40, 57, 69, 56, + 14, 17, 22, 29, 51, 87, 80, 62, + 18, 22, 37, 56, 68, 109, 103, 77, + 24, 35, 55, 64, 81, 104, 113, 92, + 49, 64, 78, 87, 103, 121, 120, 101, + 72, 92, 95, 98, 112, 100, 103, 99, + }, + // Chrominance. + { + 17, 18, 24, 47, 99, 99, 99, 99, + 18, 21, 26, 66, 99, 99, 99, 99, + 24, 26, 56, 99, 99, 99, 99, 99, + 47, 66, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + }, +} + +func TestUnscaledQuant(t *testing.T) { + bad := false + for i := quantIndex(0); i < nQuantIndex; i++ { + for zig := 0; zig < blockSize; zig++ { + got := unscaledQuant[i][zig] + want := unscaledQuantInNaturalOrder[i][unzig[zig]] + if got != want { + t.Errorf("i=%d, zig=%d: got %d, want %d", i, zig, got, want) + bad = true + } + } + } + if bad { + names := [nQuantIndex]string{"Luminance", "Chrominance"} + buf := &bytes.Buffer{} + for i, name := range names { + fmt.Fprintf(buf, "// %s.\n{\n", name) + for zig := 0; zig < blockSize; zig++ { + fmt.Fprintf(buf, "%d, ", unscaledQuantInNaturalOrder[i][unzig[zig]]) + if zig%8 == 7 { + buf.WriteString("\n") + } + } + buf.WriteString("},\n") + } + t.Logf("expected unscaledQuant values:\n%s", buf.String()) + } +} + +var testCase = []struct { + filename string + quality int + tolerance int64 +}{ + {"../testdata/video-001.png", 1, 24 << 8}, + {"../testdata/video-001.png", 20, 12 << 8}, + {"../testdata/video-001.png", 60, 8 << 8}, + {"../testdata/video-001.png", 80, 6 << 8}, + {"../testdata/video-001.png", 90, 4 << 8}, + {"../testdata/video-001.png", 100, 2 << 8}, +} + +func delta(u0, u1 uint32) int64 { + d := int64(u0) - int64(u1) + if d < 0 { + return -d + } + return d +} + +func readPng(filename string) (image.Image, error) { + f, err := os.Open(filename) + if err != nil { + return nil, err + } + defer f.Close() + return png.Decode(f) +} + +func TestWriter(t *testing.T) { + for _, tc := range testCase { + // Read the image. + m0, err := readPng(tc.filename) + if err != nil { + t.Error(tc.filename, err) + continue + } + // Encode that image as JPEG. + var buf bytes.Buffer + err = Encode(&buf, m0, &Options{Quality: tc.quality}) + if err != nil { + t.Error(tc.filename, err) + continue + } + // Decode that JPEG. + m1, err := Decode(&buf) + if err != nil { + t.Error(tc.filename, err) + continue + } + if m0.Bounds() != m1.Bounds() { + t.Errorf("%s, bounds differ: %v and %v", tc.filename, m0.Bounds(), m1.Bounds()) + continue + } + // Compare the average delta to the tolerance level. + if averageDelta(m0, m1) > tc.tolerance { + t.Errorf("%s, quality=%d: average delta is too high", tc.filename, tc.quality) + continue + } + } +} + +// TestWriteGrayscale tests that a grayscale images survives a round-trip +// through encode/decode cycle. +func TestWriteGrayscale(t *testing.T) { + m0 := image.NewGray(image.Rect(0, 0, 32, 32)) + for i := range m0.Pix { + m0.Pix[i] = uint8(i) + } + var buf bytes.Buffer + if err := Encode(&buf, m0, nil); err != nil { + t.Fatal(err) + } + m1, err := Decode(&buf) + if err != nil { + t.Fatal(err) + } + if m0.Bounds() != m1.Bounds() { + t.Fatalf("bounds differ: %v and %v", m0.Bounds(), m1.Bounds()) + } + if _, ok := m1.(*image.Gray); !ok { + t.Errorf("got %T, want *image.Gray", m1) + } + // Compare the average delta to the tolerance level. + want := int64(2 << 8) + if got := averageDelta(m0, m1); got > want { + t.Errorf("average delta too high; got %d, want <= %d", got, want) + } +} + +// averageDelta returns the average delta in RGB space. The two images must +// have the same bounds. +func averageDelta(m0, m1 image.Image) int64 { + b := m0.Bounds() + var sum, n int64 + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + c0 := m0.At(x, y) + c1 := m1.At(x, y) + r0, g0, b0, _ := c0.RGBA() + r1, g1, b1, _ := c1.RGBA() + sum += delta(r0, r1) + sum += delta(g0, g1) + sum += delta(b0, b1) + n += 3 + } + } + return sum / n +} + +func TestEncodeYCbCr(t *testing.T) { + bo := image.Rect(0, 0, 640, 480) + imgRGBA := image.NewRGBA(bo) + // Must use 444 subsampling to avoid lossy RGBA to YCbCr conversion. + imgYCbCr := image.NewYCbCr(bo, image.YCbCrSubsampleRatio444) + rnd := rand.New(rand.NewSource(123)) + // Create identical rgba and ycbcr images. + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + col := color.RGBA{ + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + 255, + } + imgRGBA.SetRGBA(x, y, col) + yo := imgYCbCr.YOffset(x, y) + co := imgYCbCr.COffset(x, y) + cy, ccr, ccb := color.RGBToYCbCr(col.R, col.G, col.B) + imgYCbCr.Y[yo] = cy + imgYCbCr.Cb[co] = ccr + imgYCbCr.Cr[co] = ccb + } + } + + // Now check that both images are identical after an encode. + var bufRGBA, bufYCbCr bytes.Buffer + Encode(&bufRGBA, imgRGBA, nil) + Encode(&bufYCbCr, imgYCbCr, nil) + if !bytes.Equal(bufRGBA.Bytes(), bufYCbCr.Bytes()) { + t.Errorf("RGBA and YCbCr encoded bytes differ") + } +} + +func BenchmarkEncodeRGBA(b *testing.B) { + img := image.NewRGBA(image.Rect(0, 0, 640, 480)) + bo := img.Bounds() + rnd := rand.New(rand.NewSource(123)) + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + img.SetRGBA(x, y, color.RGBA{ + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + uint8(rnd.Intn(256)), + 255, + }) + } + } + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + options := &Options{Quality: 90} + for i := 0; i < b.N; i++ { + Encode(io.Discard, img, options) + } +} + +func BenchmarkEncodeYCbCr(b *testing.B) { + img := image.NewYCbCr(image.Rect(0, 0, 640, 480), image.YCbCrSubsampleRatio420) + bo := img.Bounds() + rnd := rand.New(rand.NewSource(123)) + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + cy := img.YOffset(x, y) + ci := img.COffset(x, y) + img.Y[cy] = uint8(rnd.Intn(256)) + img.Cb[ci] = uint8(rnd.Intn(256)) + img.Cr[ci] = uint8(rnd.Intn(256)) + } + } + b.SetBytes(640 * 480 * 3) + b.ReportAllocs() + b.ResetTimer() + options := &Options{Quality: 90} + for i := 0; i < b.N; i++ { + Encode(io.Discard, img, options) + } +} diff --git a/src/image/names.go b/src/image/names.go new file mode 100644 index 0000000..17b0658 --- /dev/null +++ b/src/image/names.go @@ -0,0 +1,58 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "image/color" +) + +var ( + // Black is an opaque black uniform image. + Black = NewUniform(color.Black) + // White is an opaque white uniform image. + White = NewUniform(color.White) + // Transparent is a fully transparent uniform image. + Transparent = NewUniform(color.Transparent) + // Opaque is a fully opaque uniform image. + Opaque = NewUniform(color.Opaque) +) + +// Uniform is an infinite-sized Image of uniform color. +// It implements the color.Color, color.Model, and Image interfaces. +type Uniform struct { + C color.Color +} + +func (c *Uniform) RGBA() (r, g, b, a uint32) { + return c.C.RGBA() +} + +func (c *Uniform) ColorModel() color.Model { + return c +} + +func (c *Uniform) Convert(color.Color) color.Color { + return c.C +} + +func (c *Uniform) Bounds() Rectangle { return Rectangle{Point{-1e9, -1e9}, Point{1e9, 1e9}} } + +func (c *Uniform) At(x, y int) color.Color { return c.C } + +func (c *Uniform) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := c.C.RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (c *Uniform) Opaque() bool { + _, _, _, a := c.C.RGBA() + return a == 0xffff +} + +// NewUniform returns a new Uniform image of the given color. +func NewUniform(c color.Color) *Uniform { + return &Uniform{c} +} diff --git a/src/image/png/example_test.go b/src/image/png/example_test.go new file mode 100644 index 0000000..c437632 --- /dev/null +++ b/src/image/png/example_test.go @@ -0,0 +1,77 @@ +// Copyright 2016 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png_test + +import ( + "encoding/base64" + "fmt" + "image" + "image/color" + "image/png" + "io" + "log" + "os" + "strings" +) + +const gopher = `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` + +// gopherPNG creates an io.Reader by decoding the base64 encoded image data string in the gopher constant. +func gopherPNG() io.Reader { return base64.NewDecoder(base64.StdEncoding, strings.NewReader(gopher)) } + +func ExampleDecode() { + // This example uses png.Decode which can only decode PNG images. + // Consider using the general image.Decode as it can sniff and decode any registered image format. + img, err := png.Decode(gopherPNG()) + if err != nil { + log.Fatal(err) + } + + levels := []string{" ", "░", "▒", "▓", "█"} + + for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ { + for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ { + c := color.GrayModel.Convert(img.At(x, y)).(color.Gray) + level := c.Y / 51 // 51 * 5 = 255 + if level == 5 { + level-- + } + fmt.Print(levels[level]) + } + fmt.Print("\n") + } +} + +func ExampleEncode() { + const width, height = 256, 256 + + // Create a colored image of the given width and height. + img := image.NewNRGBA(image.Rect(0, 0, width, height)) + + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + img.Set(x, y, color.NRGBA{ + R: uint8((x + y) & 255), + G: uint8((x + y) << 1 & 255), + B: uint8((x + y) << 2 & 255), + A: 255, + }) + } + } + + f, err := os.Create("image.png") + if err != nil { + log.Fatal(err) + } + + if err := png.Encode(f, img); err != nil { + f.Close() + log.Fatal(err) + } + + if err := f.Close(); err != nil { + log.Fatal(err) + } +} diff --git a/src/image/png/fuzz.go b/src/image/png/fuzz.go new file mode 100644 index 0000000..6508533 --- /dev/null +++ b/src/image/png/fuzz.go @@ -0,0 +1,53 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +//go:build gofuzz +// +build gofuzz + +package png + +import ( + "bytes" + "fmt" +) + +func Fuzz(data []byte) int { + cfg, err := DecodeConfig(bytes.NewReader(data)) + if err != nil { + return 0 + } + if cfg.Width*cfg.Height > 1e6 { + return 0 + } + img, err := Decode(bytes.NewReader(data)) + if err != nil { + return 0 + } + levels := []CompressionLevel{ + DefaultCompression, + NoCompression, + BestSpeed, + BestCompression, + } + for _, l := range levels { + var w bytes.Buffer + e := &Encoder{CompressionLevel: l} + err = e.Encode(&w, img) + if err != nil { + panic(err) + } + img1, err := Decode(&w) + if err != nil { + panic(err) + } + got := img1.Bounds() + want := img.Bounds() + if !got.Eq(want) { + fmt.Printf("bounds0: %#v\n", want) + fmt.Printf("bounds1: %#v\n", got) + panic("bounds have changed") + } + } + return 1 +} diff --git a/src/image/png/paeth.go b/src/image/png/paeth.go new file mode 100644 index 0000000..9ed6300 --- /dev/null +++ b/src/image/png/paeth.go @@ -0,0 +1,71 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png + +// intSize is either 32 or 64. +const intSize = 32 << (^uint(0) >> 63) + +func abs(x int) int { + // m := -1 if x < 0. m := 0 otherwise. + m := x >> (intSize - 1) + + // In two's complement representation, the negative number + // of any number (except the smallest one) can be computed + // by flipping all the bits and add 1. This is faster than + // code with a branch. + // See Hacker's Delight, section 2-4. + return (x ^ m) - m +} + +// paeth implements the Paeth filter function, as per the PNG specification. +func paeth(a, b, c uint8) uint8 { + // This is an optimized version of the sample code in the PNG spec. + // For example, the sample code starts with: + // p := int(a) + int(b) - int(c) + // pa := abs(p - int(a)) + // but the optimized form uses fewer arithmetic operations: + // pa := int(b) - int(c) + // pa = abs(pa) + pc := int(c) + pa := int(b) - pc + pb := int(a) - pc + pc = abs(pa + pb) + pa = abs(pa) + pb = abs(pb) + if pa <= pb && pa <= pc { + return a + } else if pb <= pc { + return b + } + return c +} + +// filterPaeth applies the Paeth filter to the cdat slice. +// cdat is the current row's data, pdat is the previous row's data. +func filterPaeth(cdat, pdat []byte, bytesPerPixel int) { + var a, b, c, pa, pb, pc int + for i := 0; i < bytesPerPixel; i++ { + a, c = 0, 0 + for j := i; j < len(cdat); j += bytesPerPixel { + b = int(pdat[j]) + pa = b - c + pb = a - c + pc = abs(pa + pb) + pa = abs(pa) + pb = abs(pb) + if pa <= pb && pa <= pc { + // No-op. + } else if pb <= pc { + a = b + } else { + a = c + } + a += int(cdat[j]) + a &= 0xff + cdat[j] = uint8(a) + c = b + } + } +} diff --git a/src/image/png/paeth_test.go b/src/image/png/paeth_test.go new file mode 100644 index 0000000..cfc1896 --- /dev/null +++ b/src/image/png/paeth_test.go @@ -0,0 +1,91 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png + +import ( + "bytes" + "math/rand" + "testing" +) + +func slowAbs(x int) int { + if x < 0 { + return -x + } + return x +} + +// slowPaeth is a slow but simple implementation of the Paeth function. +// It is a straight port of the sample code in the PNG spec, section 9.4. +func slowPaeth(a, b, c uint8) uint8 { + p := int(a) + int(b) - int(c) + pa := slowAbs(p - int(a)) + pb := slowAbs(p - int(b)) + pc := slowAbs(p - int(c)) + if pa <= pb && pa <= pc { + return a + } else if pb <= pc { + return b + } + return c +} + +// slowFilterPaeth is a slow but simple implementation of func filterPaeth. +func slowFilterPaeth(cdat, pdat []byte, bytesPerPixel int) { + for i := 0; i < bytesPerPixel; i++ { + cdat[i] += paeth(0, pdat[i], 0) + } + for i := bytesPerPixel; i < len(cdat); i++ { + cdat[i] += paeth(cdat[i-bytesPerPixel], pdat[i], pdat[i-bytesPerPixel]) + } +} + +func TestPaeth(t *testing.T) { + for a := 0; a < 256; a += 15 { + for b := 0; b < 256; b += 15 { + for c := 0; c < 256; c += 15 { + got := paeth(uint8(a), uint8(b), uint8(c)) + want := slowPaeth(uint8(a), uint8(b), uint8(c)) + if got != want { + t.Errorf("a, b, c = %d, %d, %d: got %d, want %d", a, b, c, got, want) + } + } + } + } +} + +func BenchmarkPaeth(b *testing.B) { + for i := 0; i < b.N; i++ { + paeth(uint8(i>>16), uint8(i>>8), uint8(i)) + } +} + +func TestPaethDecode(t *testing.T) { + pdat0 := make([]byte, 32) + pdat1 := make([]byte, 32) + pdat2 := make([]byte, 32) + cdat0 := make([]byte, 32) + cdat1 := make([]byte, 32) + cdat2 := make([]byte, 32) + r := rand.New(rand.NewSource(1)) + for bytesPerPixel := 1; bytesPerPixel <= 8; bytesPerPixel++ { + for i := 0; i < 100; i++ { + for j := range pdat0 { + pdat0[j] = uint8(r.Uint32()) + cdat0[j] = uint8(r.Uint32()) + } + copy(pdat1, pdat0) + copy(pdat2, pdat0) + copy(cdat1, cdat0) + copy(cdat2, cdat0) + filterPaeth(cdat1, pdat1, bytesPerPixel) + slowFilterPaeth(cdat2, pdat2, bytesPerPixel) + if !bytes.Equal(cdat1, cdat2) { + t.Errorf("bytesPerPixel: %d\npdat0: % x\ncdat0: % x\ngot: % x\nwant: % x", bytesPerPixel, pdat0, cdat0, cdat1, cdat2) + break + } + } + } +} diff --git a/src/image/png/reader.go b/src/image/png/reader.go new file mode 100644 index 0000000..910520b --- /dev/null +++ b/src/image/png/reader.go @@ -0,0 +1,1035 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package png implements a PNG image decoder and encoder. +// +// The PNG specification is at https://www.w3.org/TR/PNG/. +package png + +import ( + "compress/zlib" + "encoding/binary" + "fmt" + "hash" + "hash/crc32" + "image" + "image/color" + "io" +) + +// Color type, as per the PNG spec. +const ( + ctGrayscale = 0 + ctTrueColor = 2 + ctPaletted = 3 + ctGrayscaleAlpha = 4 + ctTrueColorAlpha = 6 +) + +// A cb is a combination of color type and bit depth. +const ( + cbInvalid = iota + cbG1 + cbG2 + cbG4 + cbG8 + cbGA8 + cbTC8 + cbP1 + cbP2 + cbP4 + cbP8 + cbTCA8 + cbG16 + cbGA16 + cbTC16 + cbTCA16 +) + +func cbPaletted(cb int) bool { + return cbP1 <= cb && cb <= cbP8 +} + +// Filter type, as per the PNG spec. +const ( + ftNone = 0 + ftSub = 1 + ftUp = 2 + ftAverage = 3 + ftPaeth = 4 + nFilter = 5 +) + +// Interlace type. +const ( + itNone = 0 + itAdam7 = 1 +) + +// interlaceScan defines the placement and size of a pass for Adam7 interlacing. +type interlaceScan struct { + xFactor, yFactor, xOffset, yOffset int +} + +// interlacing defines Adam7 interlacing, with 7 passes of reduced images. +// See https://www.w3.org/TR/PNG/#8Interlace +var interlacing = []interlaceScan{ + {8, 8, 0, 0}, + {8, 8, 4, 0}, + {4, 8, 0, 4}, + {4, 4, 2, 0}, + {2, 4, 0, 2}, + {2, 2, 1, 0}, + {1, 2, 0, 1}, +} + +// Decoding stage. +// The PNG specification says that the IHDR, PLTE (if present), tRNS (if +// present), IDAT and IEND chunks must appear in that order. There may be +// multiple IDAT chunks, and IDAT chunks must be sequential (i.e. they may not +// have any other chunks between them). +// https://www.w3.org/TR/PNG/#5ChunkOrdering +const ( + dsStart = iota + dsSeenIHDR + dsSeenPLTE + dsSeentRNS + dsSeenIDAT + dsSeenIEND +) + +const pngHeader = "\x89PNG\r\n\x1a\n" + +type decoder struct { + r io.Reader + img image.Image + crc hash.Hash32 + width, height int + depth int + palette color.Palette + cb int + stage int + idatLength uint32 + tmp [3 * 256]byte + interlace int + + // useTransparent and transparent are used for grayscale and truecolor + // transparency, as opposed to palette transparency. + useTransparent bool + transparent [6]byte +} + +// A FormatError reports that the input is not a valid PNG. +type FormatError string + +func (e FormatError) Error() string { return "png: invalid format: " + string(e) } + +var chunkOrderError = FormatError("chunk out of order") + +// An UnsupportedError reports that the input uses a valid but unimplemented PNG feature. +type UnsupportedError string + +func (e UnsupportedError) Error() string { return "png: unsupported feature: " + string(e) } + +func min(a, b int) int { + if a < b { + return a + } + return b +} + +func (d *decoder) parseIHDR(length uint32) error { + if length != 13 { + return FormatError("bad IHDR length") + } + if _, err := io.ReadFull(d.r, d.tmp[:13]); err != nil { + return err + } + d.crc.Write(d.tmp[:13]) + if d.tmp[10] != 0 { + return UnsupportedError("compression method") + } + if d.tmp[11] != 0 { + return UnsupportedError("filter method") + } + if d.tmp[12] != itNone && d.tmp[12] != itAdam7 { + return FormatError("invalid interlace method") + } + d.interlace = int(d.tmp[12]) + + w := int32(binary.BigEndian.Uint32(d.tmp[0:4])) + h := int32(binary.BigEndian.Uint32(d.tmp[4:8])) + if w <= 0 || h <= 0 { + return FormatError("non-positive dimension") + } + nPixels64 := int64(w) * int64(h) + nPixels := int(nPixels64) + if nPixels64 != int64(nPixels) { + return UnsupportedError("dimension overflow") + } + // There can be up to 8 bytes per pixel, for 16 bits per channel RGBA. + if nPixels != (nPixels*8)/8 { + return UnsupportedError("dimension overflow") + } + + d.cb = cbInvalid + d.depth = int(d.tmp[8]) + switch d.depth { + case 1: + switch d.tmp[9] { + case ctGrayscale: + d.cb = cbG1 + case ctPaletted: + d.cb = cbP1 + } + case 2: + switch d.tmp[9] { + case ctGrayscale: + d.cb = cbG2 + case ctPaletted: + d.cb = cbP2 + } + case 4: + switch d.tmp[9] { + case ctGrayscale: + d.cb = cbG4 + case ctPaletted: + d.cb = cbP4 + } + case 8: + switch d.tmp[9] { + case ctGrayscale: + d.cb = cbG8 + case ctTrueColor: + d.cb = cbTC8 + case ctPaletted: + d.cb = cbP8 + case ctGrayscaleAlpha: + d.cb = cbGA8 + case ctTrueColorAlpha: + d.cb = cbTCA8 + } + case 16: + switch d.tmp[9] { + case ctGrayscale: + d.cb = cbG16 + case ctTrueColor: + d.cb = cbTC16 + case ctGrayscaleAlpha: + d.cb = cbGA16 + case ctTrueColorAlpha: + d.cb = cbTCA16 + } + } + if d.cb == cbInvalid { + return UnsupportedError(fmt.Sprintf("bit depth %d, color type %d", d.tmp[8], d.tmp[9])) + } + d.width, d.height = int(w), int(h) + return d.verifyChecksum() +} + +func (d *decoder) parsePLTE(length uint32) error { + np := int(length / 3) // The number of palette entries. + if length%3 != 0 || np <= 0 || np > 256 || np > 1<<uint(d.depth) { + return FormatError("bad PLTE length") + } + n, err := io.ReadFull(d.r, d.tmp[:3*np]) + if err != nil { + return err + } + d.crc.Write(d.tmp[:n]) + switch d.cb { + case cbP1, cbP2, cbP4, cbP8: + d.palette = make(color.Palette, 256) + for i := 0; i < np; i++ { + d.palette[i] = color.RGBA{d.tmp[3*i+0], d.tmp[3*i+1], d.tmp[3*i+2], 0xff} + } + for i := np; i < 256; i++ { + // Initialize the rest of the palette to opaque black. The spec (section + // 11.2.3) says that "any out-of-range pixel value found in the image data + // is an error", but some real-world PNG files have out-of-range pixel + // values. We fall back to opaque black, the same as libpng 1.5.13; + // ImageMagick 6.5.7 returns an error. + d.palette[i] = color.RGBA{0x00, 0x00, 0x00, 0xff} + } + d.palette = d.palette[:np] + case cbTC8, cbTCA8, cbTC16, cbTCA16: + // As per the PNG spec, a PLTE chunk is optional (and for practical purposes, + // ignorable) for the ctTrueColor and ctTrueColorAlpha color types (section 4.1.2). + default: + return FormatError("PLTE, color type mismatch") + } + return d.verifyChecksum() +} + +func (d *decoder) parsetRNS(length uint32) error { + switch d.cb { + case cbG1, cbG2, cbG4, cbG8, cbG16: + if length != 2 { + return FormatError("bad tRNS length") + } + n, err := io.ReadFull(d.r, d.tmp[:length]) + if err != nil { + return err + } + d.crc.Write(d.tmp[:n]) + + copy(d.transparent[:], d.tmp[:length]) + switch d.cb { + case cbG1: + d.transparent[1] *= 0xff + case cbG2: + d.transparent[1] *= 0x55 + case cbG4: + d.transparent[1] *= 0x11 + } + d.useTransparent = true + + case cbTC8, cbTC16: + if length != 6 { + return FormatError("bad tRNS length") + } + n, err := io.ReadFull(d.r, d.tmp[:length]) + if err != nil { + return err + } + d.crc.Write(d.tmp[:n]) + + copy(d.transparent[:], d.tmp[:length]) + d.useTransparent = true + + case cbP1, cbP2, cbP4, cbP8: + if length > 256 { + return FormatError("bad tRNS length") + } + n, err := io.ReadFull(d.r, d.tmp[:length]) + if err != nil { + return err + } + d.crc.Write(d.tmp[:n]) + + if len(d.palette) < n { + d.palette = d.palette[:n] + } + for i := 0; i < n; i++ { + rgba := d.palette[i].(color.RGBA) + d.palette[i] = color.NRGBA{rgba.R, rgba.G, rgba.B, d.tmp[i]} + } + + default: + return FormatError("tRNS, color type mismatch") + } + return d.verifyChecksum() +} + +// Read presents one or more IDAT chunks as one continuous stream (minus the +// intermediate chunk headers and footers). If the PNG data looked like: +// ... len0 IDAT xxx crc0 len1 IDAT yy crc1 len2 IEND crc2 +// then this reader presents xxxyy. For well-formed PNG data, the decoder state +// immediately before the first Read call is that d.r is positioned between the +// first IDAT and xxx, and the decoder state immediately after the last Read +// call is that d.r is positioned between yy and crc1. +func (d *decoder) Read(p []byte) (int, error) { + if len(p) == 0 { + return 0, nil + } + for d.idatLength == 0 { + // We have exhausted an IDAT chunk. Verify the checksum of that chunk. + if err := d.verifyChecksum(); err != nil { + return 0, err + } + // Read the length and chunk type of the next chunk, and check that + // it is an IDAT chunk. + if _, err := io.ReadFull(d.r, d.tmp[:8]); err != nil { + return 0, err + } + d.idatLength = binary.BigEndian.Uint32(d.tmp[:4]) + if string(d.tmp[4:8]) != "IDAT" { + return 0, FormatError("not enough pixel data") + } + d.crc.Reset() + d.crc.Write(d.tmp[4:8]) + } + if int(d.idatLength) < 0 { + return 0, UnsupportedError("IDAT chunk length overflow") + } + n, err := d.r.Read(p[:min(len(p), int(d.idatLength))]) + d.crc.Write(p[:n]) + d.idatLength -= uint32(n) + return n, err +} + +// decode decodes the IDAT data into an image. +func (d *decoder) decode() (image.Image, error) { + r, err := zlib.NewReader(d) + if err != nil { + return nil, err + } + defer r.Close() + var img image.Image + if d.interlace == itNone { + img, err = d.readImagePass(r, 0, false) + if err != nil { + return nil, err + } + } else if d.interlace == itAdam7 { + // Allocate a blank image of the full size. + img, err = d.readImagePass(nil, 0, true) + if err != nil { + return nil, err + } + for pass := 0; pass < 7; pass++ { + imagePass, err := d.readImagePass(r, pass, false) + if err != nil { + return nil, err + } + if imagePass != nil { + d.mergePassInto(img, imagePass, pass) + } + } + } + + // Check for EOF, to verify the zlib checksum. + n := 0 + for i := 0; n == 0 && err == nil; i++ { + if i == 100 { + return nil, io.ErrNoProgress + } + n, err = r.Read(d.tmp[:1]) + } + if err != nil && err != io.EOF { + return nil, FormatError(err.Error()) + } + if n != 0 || d.idatLength != 0 { + return nil, FormatError("too much pixel data") + } + + return img, nil +} + +// readImagePass reads a single image pass, sized according to the pass number. +func (d *decoder) readImagePass(r io.Reader, pass int, allocateOnly bool) (image.Image, error) { + bitsPerPixel := 0 + pixOffset := 0 + var ( + gray *image.Gray + rgba *image.RGBA + paletted *image.Paletted + nrgba *image.NRGBA + gray16 *image.Gray16 + rgba64 *image.RGBA64 + nrgba64 *image.NRGBA64 + img image.Image + ) + width, height := d.width, d.height + if d.interlace == itAdam7 && !allocateOnly { + p := interlacing[pass] + // Add the multiplication factor and subtract one, effectively rounding up. + width = (width - p.xOffset + p.xFactor - 1) / p.xFactor + height = (height - p.yOffset + p.yFactor - 1) / p.yFactor + // A PNG image can't have zero width or height, but for an interlaced + // image, an individual pass might have zero width or height. If so, we + // shouldn't even read a per-row filter type byte, so return early. + if width == 0 || height == 0 { + return nil, nil + } + } + switch d.cb { + case cbG1, cbG2, cbG4, cbG8: + bitsPerPixel = d.depth + if d.useTransparent { + nrgba = image.NewNRGBA(image.Rect(0, 0, width, height)) + img = nrgba + } else { + gray = image.NewGray(image.Rect(0, 0, width, height)) + img = gray + } + case cbGA8: + bitsPerPixel = 16 + nrgba = image.NewNRGBA(image.Rect(0, 0, width, height)) + img = nrgba + case cbTC8: + bitsPerPixel = 24 + if d.useTransparent { + nrgba = image.NewNRGBA(image.Rect(0, 0, width, height)) + img = nrgba + } else { + rgba = image.NewRGBA(image.Rect(0, 0, width, height)) + img = rgba + } + case cbP1, cbP2, cbP4, cbP8: + bitsPerPixel = d.depth + paletted = image.NewPaletted(image.Rect(0, 0, width, height), d.palette) + img = paletted + case cbTCA8: + bitsPerPixel = 32 + nrgba = image.NewNRGBA(image.Rect(0, 0, width, height)) + img = nrgba + case cbG16: + bitsPerPixel = 16 + if d.useTransparent { + nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height)) + img = nrgba64 + } else { + gray16 = image.NewGray16(image.Rect(0, 0, width, height)) + img = gray16 + } + case cbGA16: + bitsPerPixel = 32 + nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height)) + img = nrgba64 + case cbTC16: + bitsPerPixel = 48 + if d.useTransparent { + nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height)) + img = nrgba64 + } else { + rgba64 = image.NewRGBA64(image.Rect(0, 0, width, height)) + img = rgba64 + } + case cbTCA16: + bitsPerPixel = 64 + nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height)) + img = nrgba64 + } + if allocateOnly { + return img, nil + } + bytesPerPixel := (bitsPerPixel + 7) / 8 + + // The +1 is for the per-row filter type, which is at cr[0]. + rowSize := 1 + (int64(bitsPerPixel)*int64(width)+7)/8 + if rowSize != int64(int(rowSize)) { + return nil, UnsupportedError("dimension overflow") + } + // cr and pr are the bytes for the current and previous row. + cr := make([]uint8, rowSize) + pr := make([]uint8, rowSize) + + for y := 0; y < height; y++ { + // Read the decompressed bytes. + _, err := io.ReadFull(r, cr) + if err != nil { + if err == io.EOF || err == io.ErrUnexpectedEOF { + return nil, FormatError("not enough pixel data") + } + return nil, err + } + + // Apply the filter. + cdat := cr[1:] + pdat := pr[1:] + switch cr[0] { + case ftNone: + // No-op. + case ftSub: + for i := bytesPerPixel; i < len(cdat); i++ { + cdat[i] += cdat[i-bytesPerPixel] + } + case ftUp: + for i, p := range pdat { + cdat[i] += p + } + case ftAverage: + // The first column has no column to the left of it, so it is a + // special case. We know that the first column exists because we + // check above that width != 0, and so len(cdat) != 0. + for i := 0; i < bytesPerPixel; i++ { + cdat[i] += pdat[i] / 2 + } + for i := bytesPerPixel; i < len(cdat); i++ { + cdat[i] += uint8((int(cdat[i-bytesPerPixel]) + int(pdat[i])) / 2) + } + case ftPaeth: + filterPaeth(cdat, pdat, bytesPerPixel) + default: + return nil, FormatError("bad filter type") + } + + // Convert from bytes to colors. + switch d.cb { + case cbG1: + if d.useTransparent { + ty := d.transparent[1] + for x := 0; x < width; x += 8 { + b := cdat[x/8] + for x2 := 0; x2 < 8 && x+x2 < width; x2++ { + ycol := (b >> 7) * 0xff + acol := uint8(0xff) + if ycol == ty { + acol = 0x00 + } + nrgba.SetNRGBA(x+x2, y, color.NRGBA{ycol, ycol, ycol, acol}) + b <<= 1 + } + } + } else { + for x := 0; x < width; x += 8 { + b := cdat[x/8] + for x2 := 0; x2 < 8 && x+x2 < width; x2++ { + gray.SetGray(x+x2, y, color.Gray{(b >> 7) * 0xff}) + b <<= 1 + } + } + } + case cbG2: + if d.useTransparent { + ty := d.transparent[1] + for x := 0; x < width; x += 4 { + b := cdat[x/4] + for x2 := 0; x2 < 4 && x+x2 < width; x2++ { + ycol := (b >> 6) * 0x55 + acol := uint8(0xff) + if ycol == ty { + acol = 0x00 + } + nrgba.SetNRGBA(x+x2, y, color.NRGBA{ycol, ycol, ycol, acol}) + b <<= 2 + } + } + } else { + for x := 0; x < width; x += 4 { + b := cdat[x/4] + for x2 := 0; x2 < 4 && x+x2 < width; x2++ { + gray.SetGray(x+x2, y, color.Gray{(b >> 6) * 0x55}) + b <<= 2 + } + } + } + case cbG4: + if d.useTransparent { + ty := d.transparent[1] + for x := 0; x < width; x += 2 { + b := cdat[x/2] + for x2 := 0; x2 < 2 && x+x2 < width; x2++ { + ycol := (b >> 4) * 0x11 + acol := uint8(0xff) + if ycol == ty { + acol = 0x00 + } + nrgba.SetNRGBA(x+x2, y, color.NRGBA{ycol, ycol, ycol, acol}) + b <<= 4 + } + } + } else { + for x := 0; x < width; x += 2 { + b := cdat[x/2] + for x2 := 0; x2 < 2 && x+x2 < width; x2++ { + gray.SetGray(x+x2, y, color.Gray{(b >> 4) * 0x11}) + b <<= 4 + } + } + } + case cbG8: + if d.useTransparent { + ty := d.transparent[1] + for x := 0; x < width; x++ { + ycol := cdat[x] + acol := uint8(0xff) + if ycol == ty { + acol = 0x00 + } + nrgba.SetNRGBA(x, y, color.NRGBA{ycol, ycol, ycol, acol}) + } + } else { + copy(gray.Pix[pixOffset:], cdat) + pixOffset += gray.Stride + } + case cbGA8: + for x := 0; x < width; x++ { + ycol := cdat[2*x+0] + nrgba.SetNRGBA(x, y, color.NRGBA{ycol, ycol, ycol, cdat[2*x+1]}) + } + case cbTC8: + if d.useTransparent { + pix, i, j := nrgba.Pix, pixOffset, 0 + tr, tg, tb := d.transparent[1], d.transparent[3], d.transparent[5] + for x := 0; x < width; x++ { + r := cdat[j+0] + g := cdat[j+1] + b := cdat[j+2] + a := uint8(0xff) + if r == tr && g == tg && b == tb { + a = 0x00 + } + pix[i+0] = r + pix[i+1] = g + pix[i+2] = b + pix[i+3] = a + i += 4 + j += 3 + } + pixOffset += nrgba.Stride + } else { + pix, i, j := rgba.Pix, pixOffset, 0 + for x := 0; x < width; x++ { + pix[i+0] = cdat[j+0] + pix[i+1] = cdat[j+1] + pix[i+2] = cdat[j+2] + pix[i+3] = 0xff + i += 4 + j += 3 + } + pixOffset += rgba.Stride + } + case cbP1: + for x := 0; x < width; x += 8 { + b := cdat[x/8] + for x2 := 0; x2 < 8 && x+x2 < width; x2++ { + idx := b >> 7 + if len(paletted.Palette) <= int(idx) { + paletted.Palette = paletted.Palette[:int(idx)+1] + } + paletted.SetColorIndex(x+x2, y, idx) + b <<= 1 + } + } + case cbP2: + for x := 0; x < width; x += 4 { + b := cdat[x/4] + for x2 := 0; x2 < 4 && x+x2 < width; x2++ { + idx := b >> 6 + if len(paletted.Palette) <= int(idx) { + paletted.Palette = paletted.Palette[:int(idx)+1] + } + paletted.SetColorIndex(x+x2, y, idx) + b <<= 2 + } + } + case cbP4: + for x := 0; x < width; x += 2 { + b := cdat[x/2] + for x2 := 0; x2 < 2 && x+x2 < width; x2++ { + idx := b >> 4 + if len(paletted.Palette) <= int(idx) { + paletted.Palette = paletted.Palette[:int(idx)+1] + } + paletted.SetColorIndex(x+x2, y, idx) + b <<= 4 + } + } + case cbP8: + if len(paletted.Palette) != 256 { + for x := 0; x < width; x++ { + if len(paletted.Palette) <= int(cdat[x]) { + paletted.Palette = paletted.Palette[:int(cdat[x])+1] + } + } + } + copy(paletted.Pix[pixOffset:], cdat) + pixOffset += paletted.Stride + case cbTCA8: + copy(nrgba.Pix[pixOffset:], cdat) + pixOffset += nrgba.Stride + case cbG16: + if d.useTransparent { + ty := uint16(d.transparent[0])<<8 | uint16(d.transparent[1]) + for x := 0; x < width; x++ { + ycol := uint16(cdat[2*x+0])<<8 | uint16(cdat[2*x+1]) + acol := uint16(0xffff) + if ycol == ty { + acol = 0x0000 + } + nrgba64.SetNRGBA64(x, y, color.NRGBA64{ycol, ycol, ycol, acol}) + } + } else { + for x := 0; x < width; x++ { + ycol := uint16(cdat[2*x+0])<<8 | uint16(cdat[2*x+1]) + gray16.SetGray16(x, y, color.Gray16{ycol}) + } + } + case cbGA16: + for x := 0; x < width; x++ { + ycol := uint16(cdat[4*x+0])<<8 | uint16(cdat[4*x+1]) + acol := uint16(cdat[4*x+2])<<8 | uint16(cdat[4*x+3]) + nrgba64.SetNRGBA64(x, y, color.NRGBA64{ycol, ycol, ycol, acol}) + } + case cbTC16: + if d.useTransparent { + tr := uint16(d.transparent[0])<<8 | uint16(d.transparent[1]) + tg := uint16(d.transparent[2])<<8 | uint16(d.transparent[3]) + tb := uint16(d.transparent[4])<<8 | uint16(d.transparent[5]) + for x := 0; x < width; x++ { + rcol := uint16(cdat[6*x+0])<<8 | uint16(cdat[6*x+1]) + gcol := uint16(cdat[6*x+2])<<8 | uint16(cdat[6*x+3]) + bcol := uint16(cdat[6*x+4])<<8 | uint16(cdat[6*x+5]) + acol := uint16(0xffff) + if rcol == tr && gcol == tg && bcol == tb { + acol = 0x0000 + } + nrgba64.SetNRGBA64(x, y, color.NRGBA64{rcol, gcol, bcol, acol}) + } + } else { + for x := 0; x < width; x++ { + rcol := uint16(cdat[6*x+0])<<8 | uint16(cdat[6*x+1]) + gcol := uint16(cdat[6*x+2])<<8 | uint16(cdat[6*x+3]) + bcol := uint16(cdat[6*x+4])<<8 | uint16(cdat[6*x+5]) + rgba64.SetRGBA64(x, y, color.RGBA64{rcol, gcol, bcol, 0xffff}) + } + } + case cbTCA16: + for x := 0; x < width; x++ { + rcol := uint16(cdat[8*x+0])<<8 | uint16(cdat[8*x+1]) + gcol := uint16(cdat[8*x+2])<<8 | uint16(cdat[8*x+3]) + bcol := uint16(cdat[8*x+4])<<8 | uint16(cdat[8*x+5]) + acol := uint16(cdat[8*x+6])<<8 | uint16(cdat[8*x+7]) + nrgba64.SetNRGBA64(x, y, color.NRGBA64{rcol, gcol, bcol, acol}) + } + } + + // The current row for y is the previous row for y+1. + pr, cr = cr, pr + } + + return img, nil +} + +// mergePassInto merges a single pass into a full sized image. +func (d *decoder) mergePassInto(dst image.Image, src image.Image, pass int) { + p := interlacing[pass] + var ( + srcPix []uint8 + dstPix []uint8 + stride int + rect image.Rectangle + bytesPerPixel int + ) + switch target := dst.(type) { + case *image.Alpha: + srcPix = src.(*image.Alpha).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 1 + case *image.Alpha16: + srcPix = src.(*image.Alpha16).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 2 + case *image.Gray: + srcPix = src.(*image.Gray).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 1 + case *image.Gray16: + srcPix = src.(*image.Gray16).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 2 + case *image.NRGBA: + srcPix = src.(*image.NRGBA).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 4 + case *image.NRGBA64: + srcPix = src.(*image.NRGBA64).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 8 + case *image.Paletted: + srcPix = src.(*image.Paletted).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 1 + case *image.RGBA: + srcPix = src.(*image.RGBA).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 4 + case *image.RGBA64: + srcPix = src.(*image.RGBA64).Pix + dstPix, stride, rect = target.Pix, target.Stride, target.Rect + bytesPerPixel = 8 + } + s, bounds := 0, src.Bounds() + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + dBase := (y*p.yFactor+p.yOffset-rect.Min.Y)*stride + (p.xOffset-rect.Min.X)*bytesPerPixel + for x := bounds.Min.X; x < bounds.Max.X; x++ { + d := dBase + x*p.xFactor*bytesPerPixel + copy(dstPix[d:], srcPix[s:s+bytesPerPixel]) + s += bytesPerPixel + } + } +} + +func (d *decoder) parseIDAT(length uint32) (err error) { + d.idatLength = length + d.img, err = d.decode() + if err != nil { + return err + } + return d.verifyChecksum() +} + +func (d *decoder) parseIEND(length uint32) error { + if length != 0 { + return FormatError("bad IEND length") + } + return d.verifyChecksum() +} + +func (d *decoder) parseChunk() error { + // Read the length and chunk type. + if _, err := io.ReadFull(d.r, d.tmp[:8]); err != nil { + return err + } + length := binary.BigEndian.Uint32(d.tmp[:4]) + d.crc.Reset() + d.crc.Write(d.tmp[4:8]) + + // Read the chunk data. + switch string(d.tmp[4:8]) { + case "IHDR": + if d.stage != dsStart { + return chunkOrderError + } + d.stage = dsSeenIHDR + return d.parseIHDR(length) + case "PLTE": + if d.stage != dsSeenIHDR { + return chunkOrderError + } + d.stage = dsSeenPLTE + return d.parsePLTE(length) + case "tRNS": + if cbPaletted(d.cb) { + if d.stage != dsSeenPLTE { + return chunkOrderError + } + } else if d.stage != dsSeenIHDR { + return chunkOrderError + } + d.stage = dsSeentRNS + return d.parsetRNS(length) + case "IDAT": + if d.stage < dsSeenIHDR || d.stage > dsSeenIDAT || (d.stage == dsSeenIHDR && cbPaletted(d.cb)) { + return chunkOrderError + } else if d.stage == dsSeenIDAT { + // Ignore trailing zero-length or garbage IDAT chunks. + // + // This does not affect valid PNG images that contain multiple IDAT + // chunks, since the first call to parseIDAT below will consume all + // consecutive IDAT chunks required for decoding the image. + break + } + d.stage = dsSeenIDAT + return d.parseIDAT(length) + case "IEND": + if d.stage != dsSeenIDAT { + return chunkOrderError + } + d.stage = dsSeenIEND + return d.parseIEND(length) + } + if length > 0x7fffffff { + return FormatError(fmt.Sprintf("Bad chunk length: %d", length)) + } + // Ignore this chunk (of a known length). + var ignored [4096]byte + for length > 0 { + n, err := io.ReadFull(d.r, ignored[:min(len(ignored), int(length))]) + if err != nil { + return err + } + d.crc.Write(ignored[:n]) + length -= uint32(n) + } + return d.verifyChecksum() +} + +func (d *decoder) verifyChecksum() error { + if _, err := io.ReadFull(d.r, d.tmp[:4]); err != nil { + return err + } + if binary.BigEndian.Uint32(d.tmp[:4]) != d.crc.Sum32() { + return FormatError("invalid checksum") + } + return nil +} + +func (d *decoder) checkHeader() error { + _, err := io.ReadFull(d.r, d.tmp[:len(pngHeader)]) + if err != nil { + return err + } + if string(d.tmp[:len(pngHeader)]) != pngHeader { + return FormatError("not a PNG file") + } + return nil +} + +// Decode reads a PNG image from r and returns it as an image.Image. +// The type of Image returned depends on the PNG contents. +func Decode(r io.Reader) (image.Image, error) { + d := &decoder{ + r: r, + crc: crc32.NewIEEE(), + } + if err := d.checkHeader(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return nil, err + } + for d.stage != dsSeenIEND { + if err := d.parseChunk(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return nil, err + } + } + return d.img, nil +} + +// DecodeConfig returns the color model and dimensions of a PNG image without +// decoding the entire image. +func DecodeConfig(r io.Reader) (image.Config, error) { + d := &decoder{ + r: r, + crc: crc32.NewIEEE(), + } + if err := d.checkHeader(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return image.Config{}, err + } + for { + if err := d.parseChunk(); err != nil { + if err == io.EOF { + err = io.ErrUnexpectedEOF + } + return image.Config{}, err + } + paletted := cbPaletted(d.cb) + if d.stage == dsSeenIHDR && !paletted { + break + } + if d.stage == dsSeenPLTE && paletted { + break + } + } + var cm color.Model + switch d.cb { + case cbG1, cbG2, cbG4, cbG8: + cm = color.GrayModel + case cbGA8: + cm = color.NRGBAModel + case cbTC8: + cm = color.RGBAModel + case cbP1, cbP2, cbP4, cbP8: + cm = d.palette + case cbTCA8: + cm = color.NRGBAModel + case cbG16: + cm = color.Gray16Model + case cbGA16: + cm = color.NRGBA64Model + case cbTC16: + cm = color.RGBA64Model + case cbTCA16: + cm = color.NRGBA64Model + } + return image.Config{ + ColorModel: cm, + Width: d.width, + Height: d.height, + }, nil +} + +func init() { + image.RegisterFormat("png", pngHeader, Decode, DecodeConfig) +} diff --git a/src/image/png/reader_test.go b/src/image/png/reader_test.go new file mode 100644 index 0000000..3937685 --- /dev/null +++ b/src/image/png/reader_test.go @@ -0,0 +1,825 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png + +import ( + "bufio" + "bytes" + "fmt" + "image" + "image/color" + "io" + "os" + "reflect" + "strings" + "testing" +) + +var filenames = []string{ + "basn0g01", + "basn0g01-30", + "basn0g02", + "basn0g02-29", + "basn0g04", + "basn0g04-31", + "basn0g08", + "basn0g16", + "basn2c08", + "basn2c16", + "basn3p01", + "basn3p02", + "basn3p04", + "basn3p04-31i", + "basn3p08", + "basn3p08-trns", + "basn4a08", + "basn4a16", + "basn6a08", + "basn6a16", + "ftbbn0g01", + "ftbbn0g02", + "ftbbn0g04", + "ftbbn2c16", + "ftbbn3p08", + "ftbgn2c16", + "ftbgn3p08", + "ftbrn2c08", + "ftbwn0g16", + "ftbwn3p08", + "ftbyn3p08", + "ftp0n0g08", + "ftp0n2c08", + "ftp0n3p08", + "ftp1n3p08", +} + +var filenamesPaletted = []string{ + "basn3p01", + "basn3p02", + "basn3p04", + "basn3p08", + "basn3p08-trns", +} + +var filenamesShort = []string{ + "basn0g01", + "basn0g04-31", + "basn6a16", +} + +func readPNG(filename string) (image.Image, error) { + f, err := os.Open(filename) + if err != nil { + return nil, err + } + defer f.Close() + return Decode(f) +} + +// fakebKGDs maps from filenames to fake bKGD chunks for our approximation to +// the sng command-line tool. Package png doesn't keep that metadata when +// png.Decode returns an image.Image. +var fakebKGDs = map[string]string{ + "ftbbn0g01": "bKGD {gray: 0;}\n", + "ftbbn0g02": "bKGD {gray: 0;}\n", + "ftbbn0g04": "bKGD {gray: 0;}\n", + "ftbbn2c16": "bKGD {red: 0; green: 0; blue: 65535;}\n", + "ftbbn3p08": "bKGD {index: 245}\n", + "ftbgn2c16": "bKGD {red: 0; green: 65535; blue: 0;}\n", + "ftbgn3p08": "bKGD {index: 245}\n", + "ftbrn2c08": "bKGD {red: 255; green: 0; blue: 0;}\n", + "ftbwn0g16": "bKGD {gray: 65535;}\n", + "ftbwn3p08": "bKGD {index: 0}\n", + "ftbyn3p08": "bKGD {index: 245}\n", +} + +// fakegAMAs maps from filenames to fake gAMA chunks for our approximation to +// the sng command-line tool. Package png doesn't keep that metadata when +// png.Decode returns an image.Image. +var fakegAMAs = map[string]string{ + "ftbbn0g01": "", + "ftbbn0g02": "gAMA {0.45455}\n", +} + +// fakeIHDRUsings maps from filenames to fake IHDR "using" lines for our +// approximation to the sng command-line tool. The PNG model is that +// transparency (in the tRNS chunk) is separate to the color/grayscale/palette +// color model (in the IHDR chunk). The Go model is that the concrete +// image.Image type returned by png.Decode, such as image.RGBA (with all pixels +// having 100% alpha) or image.NRGBA, encapsulates whether or not the image has +// transparency. This map is a hack to work around the fact that the Go model +// can't otherwise discriminate PNG's "IHDR says color (with no alpha) but tRNS +// says alpha" and "IHDR says color with alpha". +var fakeIHDRUsings = map[string]string{ + "ftbbn0g01": " using grayscale;\n", + "ftbbn0g02": " using grayscale;\n", + "ftbbn0g04": " using grayscale;\n", + "ftbbn2c16": " using color;\n", + "ftbgn2c16": " using color;\n", + "ftbrn2c08": " using color;\n", + "ftbwn0g16": " using grayscale;\n", +} + +// An approximation of the sng command-line tool. +func sng(w io.WriteCloser, filename string, png image.Image) { + defer w.Close() + bounds := png.Bounds() + cm := png.ColorModel() + var bitdepth int + switch cm { + case color.RGBAModel, color.NRGBAModel, color.AlphaModel, color.GrayModel: + bitdepth = 8 + default: + bitdepth = 16 + } + cpm, _ := cm.(color.Palette) + var paletted *image.Paletted + if cpm != nil { + switch { + case len(cpm) <= 2: + bitdepth = 1 + case len(cpm) <= 4: + bitdepth = 2 + case len(cpm) <= 16: + bitdepth = 4 + default: + bitdepth = 8 + } + paletted = png.(*image.Paletted) + } + + // Write the filename and IHDR. + io.WriteString(w, "#SNG: from "+filename+".png\nIHDR {\n") + fmt.Fprintf(w, " width: %d; height: %d; bitdepth: %d;\n", bounds.Dx(), bounds.Dy(), bitdepth) + if s, ok := fakeIHDRUsings[filename]; ok { + io.WriteString(w, s) + } else { + switch { + case cm == color.RGBAModel, cm == color.RGBA64Model: + io.WriteString(w, " using color;\n") + case cm == color.NRGBAModel, cm == color.NRGBA64Model: + io.WriteString(w, " using color alpha;\n") + case cm == color.GrayModel, cm == color.Gray16Model: + io.WriteString(w, " using grayscale;\n") + case cpm != nil: + io.WriteString(w, " using color palette;\n") + default: + io.WriteString(w, "unknown PNG decoder color model\n") + } + } + io.WriteString(w, "}\n") + + // We fake a gAMA chunk. The test files have a gAMA chunk but the go PNG + // parser ignores it (the PNG spec section 11.3 says "Ancillary chunks may + // be ignored by a decoder"). + if s, ok := fakegAMAs[filename]; ok { + io.WriteString(w, s) + } else { + io.WriteString(w, "gAMA {1.0000}\n") + } + + // Write the PLTE and tRNS (if applicable). + useTransparent := false + if cpm != nil { + lastAlpha := -1 + io.WriteString(w, "PLTE {\n") + for i, c := range cpm { + var r, g, b, a uint8 + switch c := c.(type) { + case color.RGBA: + r, g, b, a = c.R, c.G, c.B, 0xff + case color.NRGBA: + r, g, b, a = c.R, c.G, c.B, c.A + default: + panic("unknown palette color type") + } + if a != 0xff { + lastAlpha = i + } + fmt.Fprintf(w, " (%3d,%3d,%3d) # rgb = (0x%02x,0x%02x,0x%02x)\n", r, g, b, r, g, b) + } + io.WriteString(w, "}\n") + if s, ok := fakebKGDs[filename]; ok { + io.WriteString(w, s) + } + if lastAlpha != -1 { + io.WriteString(w, "tRNS {\n") + for i := 0; i <= lastAlpha; i++ { + _, _, _, a := cpm[i].RGBA() + a >>= 8 + fmt.Fprintf(w, " %d", a) + } + io.WriteString(w, "}\n") + } + } else if strings.HasPrefix(filename, "ft") { + if s, ok := fakebKGDs[filename]; ok { + io.WriteString(w, s) + } + // We fake a tRNS chunk. The test files' grayscale and truecolor + // transparent images all have their top left corner transparent. + switch c := png.At(0, 0).(type) { + case color.NRGBA: + if c.A == 0 { + useTransparent = true + io.WriteString(w, "tRNS {\n") + switch filename { + case "ftbbn0g01", "ftbbn0g02", "ftbbn0g04": + // The standard image package doesn't have a "gray with + // alpha" type. Instead, we use an image.NRGBA. + fmt.Fprintf(w, " gray: %d;\n", c.R) + default: + fmt.Fprintf(w, " red: %d; green: %d; blue: %d;\n", c.R, c.G, c.B) + } + io.WriteString(w, "}\n") + } + case color.NRGBA64: + if c.A == 0 { + useTransparent = true + io.WriteString(w, "tRNS {\n") + switch filename { + case "ftbwn0g16": + // The standard image package doesn't have a "gray16 with + // alpha" type. Instead, we use an image.NRGBA64. + fmt.Fprintf(w, " gray: %d;\n", c.R) + default: + fmt.Fprintf(w, " red: %d; green: %d; blue: %d;\n", c.R, c.G, c.B) + } + io.WriteString(w, "}\n") + } + } + } + + // Write the IMAGE. + io.WriteString(w, "IMAGE {\n pixels hex\n") + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + switch { + case cm == color.GrayModel: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + gray := png.At(x, y).(color.Gray) + fmt.Fprintf(w, "%02x", gray.Y) + } + case cm == color.Gray16Model: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + gray16 := png.At(x, y).(color.Gray16) + fmt.Fprintf(w, "%04x ", gray16.Y) + } + case cm == color.RGBAModel: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + rgba := png.At(x, y).(color.RGBA) + fmt.Fprintf(w, "%02x%02x%02x ", rgba.R, rgba.G, rgba.B) + } + case cm == color.RGBA64Model: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + rgba64 := png.At(x, y).(color.RGBA64) + fmt.Fprintf(w, "%04x%04x%04x ", rgba64.R, rgba64.G, rgba64.B) + } + case cm == color.NRGBAModel: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + nrgba := png.At(x, y).(color.NRGBA) + switch filename { + case "ftbbn0g01", "ftbbn0g02", "ftbbn0g04": + fmt.Fprintf(w, "%02x", nrgba.R) + default: + if useTransparent { + fmt.Fprintf(w, "%02x%02x%02x ", nrgba.R, nrgba.G, nrgba.B) + } else { + fmt.Fprintf(w, "%02x%02x%02x%02x ", nrgba.R, nrgba.G, nrgba.B, nrgba.A) + } + } + } + case cm == color.NRGBA64Model: + for x := bounds.Min.X; x < bounds.Max.X; x++ { + nrgba64 := png.At(x, y).(color.NRGBA64) + switch filename { + case "ftbwn0g16": + fmt.Fprintf(w, "%04x ", nrgba64.R) + default: + if useTransparent { + fmt.Fprintf(w, "%04x%04x%04x ", nrgba64.R, nrgba64.G, nrgba64.B) + } else { + fmt.Fprintf(w, "%04x%04x%04x%04x ", nrgba64.R, nrgba64.G, nrgba64.B, nrgba64.A) + } + } + } + case cpm != nil: + var b, c int + for x := bounds.Min.X; x < bounds.Max.X; x++ { + b = b<<uint(bitdepth) | int(paletted.ColorIndexAt(x, y)) + c++ + if c == 8/bitdepth { + fmt.Fprintf(w, "%02x", b) + b = 0 + c = 0 + } + } + if c != 0 { + for c != 8/bitdepth { + b = b << uint(bitdepth) + c++ + } + fmt.Fprintf(w, "%02x", b) + } + } + io.WriteString(w, "\n") + } + io.WriteString(w, "}\n") +} + +func TestReader(t *testing.T) { + names := filenames + if testing.Short() { + names = filenamesShort + } + for _, fn := range names { + // Read the .png file. + img, err := readPNG("testdata/pngsuite/" + fn + ".png") + if err != nil { + t.Error(fn, err) + continue + } + + if fn == "basn4a16" { + // basn4a16.sng is gray + alpha but sng() will produce true color + alpha + // so we just check a single random pixel. + c := img.At(2, 1).(color.NRGBA64) + if c.R != 0x11a7 || c.G != 0x11a7 || c.B != 0x11a7 || c.A != 0x1085 { + t.Error(fn, fmt.Errorf("wrong pixel value at (2, 1): %x", c)) + } + continue + } + + piper, pipew := io.Pipe() + pb := bufio.NewScanner(piper) + go sng(pipew, fn, img) + defer piper.Close() + + // Read the .sng file. + sf, err := os.Open("testdata/pngsuite/" + fn + ".sng") + if err != nil { + t.Error(fn, err) + continue + } + defer sf.Close() + sb := bufio.NewScanner(sf) + + // Compare the two, in SNG format, line by line. + for { + pdone := !pb.Scan() + sdone := !sb.Scan() + if pdone && sdone { + break + } + if pdone || sdone { + t.Errorf("%s: Different sizes", fn) + break + } + ps := pb.Text() + ss := sb.Text() + + // Newer versions of the sng command line tool append an optional + // color name to the RGB tuple. For example: + // # rgb = (0xff,0xff,0xff) grey100 + // # rgb = (0x00,0x00,0xff) blue1 + // instead of the older version's plainer: + // # rgb = (0xff,0xff,0xff) + // # rgb = (0x00,0x00,0xff) + // We strip any such name. + if strings.Contains(ss, "# rgb = (") && !strings.HasSuffix(ss, ")") { + if i := strings.LastIndex(ss, ") "); i >= 0 { + ss = ss[:i+1] + } + } + + if ps != ss { + t.Errorf("%s: Mismatch\n%s\nversus\n%s\n", fn, ps, ss) + break + } + } + if pb.Err() != nil { + t.Error(fn, pb.Err()) + } + if sb.Err() != nil { + t.Error(fn, sb.Err()) + } + } +} + +var readerErrors = []struct { + file string + err string +}{ + {"invalid-zlib.png", "zlib: invalid checksum"}, + {"invalid-crc32.png", "invalid checksum"}, + {"invalid-noend.png", "unexpected EOF"}, + {"invalid-trunc.png", "unexpected EOF"}, +} + +func TestReaderError(t *testing.T) { + for _, tt := range readerErrors { + img, err := readPNG("testdata/" + tt.file) + if err == nil { + t.Errorf("decoding %s: missing error", tt.file) + continue + } + if !strings.Contains(err.Error(), tt.err) { + t.Errorf("decoding %s: %s, want %s", tt.file, err, tt.err) + } + if img != nil { + t.Errorf("decoding %s: have image + error", tt.file) + } + } +} + +func TestPalettedDecodeConfig(t *testing.T) { + for _, fn := range filenamesPaletted { + f, err := os.Open("testdata/pngsuite/" + fn + ".png") + if err != nil { + t.Errorf("%s: open failed: %v", fn, err) + continue + } + defer f.Close() + cfg, err := DecodeConfig(f) + if err != nil { + t.Errorf("%s: %v", fn, err) + continue + } + pal, ok := cfg.ColorModel.(color.Palette) + if !ok { + t.Errorf("%s: expected paletted color model", fn) + continue + } + if pal == nil { + t.Errorf("%s: palette not initialized", fn) + continue + } + } +} + +func TestInterlaced(t *testing.T) { + a, err := readPNG("testdata/gray-gradient.png") + if err != nil { + t.Fatal(err) + } + b, err := readPNG("testdata/gray-gradient.interlaced.png") + if err != nil { + t.Fatal(err) + } + if !reflect.DeepEqual(a, b) { + t.Fatalf("decodings differ:\nnon-interlaced:\n%#v\ninterlaced:\n%#v", a, b) + } +} + +func TestIncompleteIDATOnRowBoundary(t *testing.T) { + // The following is an invalid 1x2 grayscale PNG image. The header is OK, + // but the zlib-compressed IDAT payload contains two bytes "\x02\x00", + // which is only one row of data (the leading "\x02" is a row filter). + const ( + ihdr = "\x00\x00\x00\x0dIHDR\x00\x00\x00\x01\x00\x00\x00\x02\x08\x00\x00\x00\x00\xbc\xea\xe9\xfb" + idat = "\x00\x00\x00\x0eIDAT\x78\x9c\x62\x62\x00\x04\x00\x00\xff\xff\x00\x06\x00\x03\xfa\xd0\x59\xae" + iend = "\x00\x00\x00\x00IEND\xae\x42\x60\x82" + ) + _, err := Decode(strings.NewReader(pngHeader + ihdr + idat + iend)) + if err == nil { + t.Fatal("got nil error, want non-nil") + } +} + +func TestTrailingIDATChunks(t *testing.T) { + // The following is a valid 1x1 PNG image containing color.Gray{255} and + // a trailing zero-length IDAT chunk (see PNG specification section 12.9): + const ( + ihdr = "\x00\x00\x00\x0dIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x00\x00\x00\x00\x3a\x7e\x9b\x55" + idatWhite = "\x00\x00\x00\x0eIDAT\x78\x9c\x62\xfa\x0f\x08\x00\x00\xff\xff\x01\x05\x01\x02\x5a\xdd\x39\xcd" + idatZero = "\x00\x00\x00\x00IDAT\x35\xaf\x06\x1e" + iend = "\x00\x00\x00\x00IEND\xae\x42\x60\x82" + ) + _, err := Decode(strings.NewReader(pngHeader + ihdr + idatWhite + idatZero + iend)) + if err != nil { + t.Fatalf("decoding valid image: %v", err) + } + + // Non-zero-length trailing IDAT chunks should be ignored (recoverable error). + // The following chunk contains a single pixel with color.Gray{0}. + const idatBlack = "\x00\x00\x00\x0eIDAT\x78\x9c\x62\x62\x00\x04\x00\x00\xff\xff\x00\x06\x00\x03\xfa\xd0\x59\xae" + + img, err := Decode(strings.NewReader(pngHeader + ihdr + idatWhite + idatBlack + iend)) + if err != nil { + t.Fatalf("trailing IDAT not ignored: %v", err) + } + if img.At(0, 0) == (color.Gray{0}) { + t.Fatal("decoded image from trailing IDAT chunk") + } +} + +func TestMultipletRNSChunks(t *testing.T) { + /* + The following is a valid 1x1 paletted PNG image with a 1-element palette + containing color.NRGBA{0xff, 0x00, 0x00, 0x7f}: + 0000000: 8950 4e47 0d0a 1a0a 0000 000d 4948 4452 .PNG........IHDR + 0000010: 0000 0001 0000 0001 0803 0000 0028 cb34 .............(.4 + 0000020: bb00 0000 0350 4c54 45ff 0000 19e2 0937 .....PLTE......7 + 0000030: 0000 0001 7452 4e53 7f80 5cb4 cb00 0000 ....tRNS..\..... + 0000040: 0e49 4441 5478 9c62 6200 0400 00ff ff00 .IDATx.bb....... + 0000050: 0600 03fa d059 ae00 0000 0049 454e 44ae .....Y.....IEND. + 0000060: 4260 82 B`. + Dropping the tRNS chunk makes that color's alpha 0xff instead of 0x7f. + */ + const ( + ihdr = "\x00\x00\x00\x0dIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x03\x00\x00\x00\x28\xcb\x34\xbb" + plte = "\x00\x00\x00\x03PLTE\xff\x00\x00\x19\xe2\x09\x37" + trns = "\x00\x00\x00\x01tRNS\x7f\x80\x5c\xb4\xcb" + idat = "\x00\x00\x00\x0eIDAT\x78\x9c\x62\x62\x00\x04\x00\x00\xff\xff\x00\x06\x00\x03\xfa\xd0\x59\xae" + iend = "\x00\x00\x00\x00IEND\xae\x42\x60\x82" + ) + for i := 0; i < 4; i++ { + var b []byte + b = append(b, pngHeader...) + b = append(b, ihdr...) + b = append(b, plte...) + for j := 0; j < i; j++ { + b = append(b, trns...) + } + b = append(b, idat...) + b = append(b, iend...) + + var want color.Color + m, err := Decode(bytes.NewReader(b)) + switch i { + case 0: + if err != nil { + t.Errorf("%d tRNS chunks: %v", i, err) + continue + } + want = color.RGBA{0xff, 0x00, 0x00, 0xff} + case 1: + if err != nil { + t.Errorf("%d tRNS chunks: %v", i, err) + continue + } + want = color.NRGBA{0xff, 0x00, 0x00, 0x7f} + default: + if err == nil { + t.Errorf("%d tRNS chunks: got nil error, want non-nil", i) + } + continue + } + if got := m.At(0, 0); got != want { + t.Errorf("%d tRNS chunks: got %T %v, want %T %v", i, got, got, want, want) + } + } +} + +func TestUnknownChunkLengthUnderflow(t *testing.T) { + data := []byte{0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x06, 0xf4, 0x7c, 0x55, 0x04, 0x1a, + 0xd3, 0x11, 0x9a, 0x73, 0x00, 0x00, 0xf8, 0x1e, 0xf3, 0x2e, 0x00, 0x00, + 0x01, 0x00, 0xff, 0xff, 0xff, 0xff, 0x07, 0xf4, 0x7c, 0x55, 0x04, 0x1a, + 0xd3} + _, err := Decode(bytes.NewReader(data)) + if err == nil { + t.Errorf("Didn't fail reading an unknown chunk with length 0xffffffff") + } +} + +func TestPaletted8OutOfRangePixel(t *testing.T) { + // IDAT contains a reference to a palette index that does not exist in the file. + img, err := readPNG("testdata/invalid-palette.png") + if err != nil { + t.Errorf("decoding invalid-palette.png: unexpected error %v", err) + return + } + + // Expect that the palette is extended with opaque black. + want := color.RGBA{0x00, 0x00, 0x00, 0xff} + if got := img.At(15, 15); got != want { + t.Errorf("got %F %v, expected %T %v", got, got, want, want) + } +} + +func TestGray8Transparent(t *testing.T) { + // These bytes come from https://golang.org/issues/19553 + m, err := Decode(bytes.NewReader([]byte{ + 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, + 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x0b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x85, 0x2c, 0x88, + 0x80, 0x00, 0x00, 0x00, 0x02, 0x74, 0x52, 0x4e, 0x53, 0x00, 0xff, 0x5b, 0x91, 0x22, 0xb5, 0x00, + 0x00, 0x00, 0x02, 0x62, 0x4b, 0x47, 0x44, 0x00, 0xff, 0x87, 0x8f, 0xcc, 0xbf, 0x00, 0x00, 0x00, + 0x09, 0x70, 0x48, 0x59, 0x73, 0x00, 0x00, 0x0a, 0xf0, 0x00, 0x00, 0x0a, 0xf0, 0x01, 0x42, 0xac, + 0x34, 0x98, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 0x45, 0x07, 0xd5, 0x04, 0x02, 0x12, 0x11, + 0x11, 0xf7, 0x65, 0x3d, 0x8b, 0x00, 0x00, 0x00, 0x4f, 0x49, 0x44, 0x41, 0x54, 0x08, 0xd7, 0x63, + 0xf8, 0xff, 0xff, 0xff, 0xb9, 0xbd, 0x70, 0xf0, 0x8c, 0x01, 0xc8, 0xaf, 0x6e, 0x99, 0x02, 0x05, + 0xd9, 0x7b, 0xc1, 0xfc, 0x6b, 0xff, 0xa1, 0xa0, 0x87, 0x30, 0xff, 0xd9, 0xde, 0xbd, 0xd5, 0x4b, + 0xf7, 0xee, 0xfd, 0x0e, 0xe3, 0xef, 0xcd, 0x06, 0x19, 0x14, 0xf5, 0x1e, 0xce, 0xef, 0x01, 0x31, + 0x92, 0xd7, 0x82, 0x41, 0x31, 0x9c, 0x3f, 0x07, 0x02, 0xee, 0xa1, 0xaa, 0xff, 0xff, 0x9f, 0xe1, + 0xd9, 0x56, 0x30, 0xf8, 0x0e, 0xe5, 0x03, 0x00, 0xa9, 0x42, 0x84, 0x3d, 0xdf, 0x8f, 0xa6, 0x8f, + 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82, + })) + if err != nil { + t.Fatalf("Decode: %v", err) + } + + const hex = "0123456789abcdef" + var got []byte + bounds := m.Bounds() + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + for x := bounds.Min.X; x < bounds.Max.X; x++ { + if r, _, _, a := m.At(x, y).RGBA(); a != 0 { + got = append(got, + hex[0x0f&(r>>12)], + hex[0x0f&(r>>8)], + ' ', + ) + } else { + got = append(got, + '.', + '.', + ' ', + ) + } + } + got = append(got, '\n') + } + + const want = "" + + ".. .. .. ce bd bd bd bd bd bd bd bd bd bd e6 \n" + + ".. .. .. 7b 84 94 94 94 94 94 94 94 94 6b bd \n" + + ".. .. .. 7b d6 .. .. .. .. .. .. .. .. 8c bd \n" + + ".. .. .. 7b d6 .. .. .. .. .. .. .. .. 8c bd \n" + + ".. .. .. 7b d6 .. .. .. .. .. .. .. .. 8c bd \n" + + "e6 bd bd 7b a5 bd bd f7 .. .. .. .. .. 8c bd \n" + + "bd 6b 94 94 94 94 5a ef .. .. .. .. .. 8c bd \n" + + "bd 8c .. .. .. .. 63 ad ad ad ad ad ad 73 bd \n" + + "bd 8c .. .. .. .. 63 9c 9c 9c 9c 9c 9c 9c de \n" + + "bd 6b 94 94 94 94 5a ef .. .. .. .. .. .. .. \n" + + "e6 b5 b5 b5 b5 b5 b5 f7 .. .. .. .. .. .. .. \n" + + if string(got) != want { + t.Errorf("got:\n%swant:\n%s", got, want) + } +} + +func TestDimensionOverflow(t *testing.T) { + maxInt32AsInt := int((1 << 31) - 1) + have32BitInts := 0 > (1 + maxInt32AsInt) + + testCases := []struct { + src []byte + unsupportedConfig bool + width int + height int + }{ + // These bytes come from https://golang.org/issues/22304 + // + // It encodes a 2147483646 × 2147483646 (i.e. 0x7ffffffe × 0x7ffffffe) + // NRGBA image. The (width × height) per se doesn't overflow an int64, but + // (width × height × bytesPerPixel) will. + { + src: []byte{ + 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, + 0x7f, 0xff, 0xff, 0xfe, 0x7f, 0xff, 0xff, 0xfe, 0x08, 0x06, 0x00, 0x00, 0x00, 0x30, 0x57, 0xb3, + 0xfd, 0x00, 0x00, 0x00, 0x15, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x62, 0x62, 0x20, 0x12, 0x8c, + 0x2a, 0xa4, 0xb3, 0x42, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0x13, 0x38, 0x00, 0x15, 0x2d, 0xef, + 0x5f, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82, + }, + // It's debatable whether DecodeConfig (which does not allocate a + // pixel buffer, unlike Decode) should fail in this case. The Go + // standard library has made its choice, and the standard library + // has compatibility constraints. + unsupportedConfig: true, + width: 0x7ffffffe, + height: 0x7ffffffe, + }, + + // The next three cases come from https://golang.org/issues/38435 + + { + src: []byte{ + 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, + 0x00, 0x00, 0xb5, 0x04, 0x00, 0x00, 0xb5, 0x04, 0x08, 0x06, 0x00, 0x00, 0x00, 0xf5, 0x60, 0x2c, + 0xb8, 0x00, 0x00, 0x00, 0x15, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x62, 0x62, 0x20, 0x12, 0x8c, + 0x2a, 0xa4, 0xb3, 0x42, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0x13, 0x38, 0x00, 0x15, 0x2d, 0xef, + 0x5f, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82, + }, + // Here, width * height = 0x7ffea810, just under MaxInt32, but at 4 + // bytes per pixel, the number of pixels overflows an int32. + unsupportedConfig: have32BitInts, + width: 0x0000b504, + height: 0x0000b504, + }, + + { + src: []byte{ + 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, + 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x08, 0x06, 0x00, 0x00, 0x00, 0x30, 0x6e, 0xc5, + 0x21, 0x00, 0x00, 0x00, 0x15, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x62, 0x62, 0x20, 0x12, 0x8c, + 0x2a, 0xa4, 0xb3, 0x42, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0x13, 0x38, 0x00, 0x15, 0x2d, 0xef, + 0x5f, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82, + }, + unsupportedConfig: false, + width: 0x04000000, + height: 0x00000001, + }, + + { + src: []byte{ + 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, + 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x08, 0x06, 0x00, 0x00, 0x00, 0xaa, 0xd4, 0x7c, + 0xda, 0x00, 0x00, 0x00, 0x15, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x62, 0x66, 0x20, 0x12, 0x30, + 0x8d, 0x2a, 0xa4, 0xaf, 0x42, 0x40, 0x00, 0x00, 0x00, 0xff, 0xff, 0x14, 0xd2, 0x00, 0x16, 0x00, + 0x00, 0x00, + }, + unsupportedConfig: false, + width: 0x08000000, + height: 0x00000001, + }, + } + + for i, tc := range testCases { + cfg, err := DecodeConfig(bytes.NewReader(tc.src)) + if tc.unsupportedConfig { + if err == nil { + t.Errorf("i=%d: DecodeConfig: got nil error, want non-nil", i) + } else if _, ok := err.(UnsupportedError); !ok { + t.Fatalf("Decode: got %v (of type %T), want non-nil error (of type png.UnsupportedError)", err, err) + } + continue + } else if err != nil { + t.Errorf("i=%d: DecodeConfig: %v", i, err) + continue + } else if cfg.Width != tc.width { + t.Errorf("i=%d: width: got %d, want %d", i, cfg.Width, tc.width) + continue + } else if cfg.Height != tc.height { + t.Errorf("i=%d: height: got %d, want %d", i, cfg.Height, tc.height) + continue + } + + if nPixels := int64(cfg.Width) * int64(cfg.Height); nPixels > 0x7f000000 { + // In theory, calling Decode would succeed, given several gigabytes + // of memory. In practice, trying to make a []uint8 big enough to + // hold all of the pixels can often result in OOM (out of memory). + // OOM is unrecoverable; we can't write a test that passes when OOM + // happens. Instead we skip the Decode call (and its tests). + continue + } else if testing.Short() { + // Even for smaller image dimensions, calling Decode might allocate + // 1 GiB or more of memory. This is usually feasible, and we want + // to check that calling Decode doesn't panic if there's enough + // memory, but we provide a runtime switch (testing.Short) to skip + // these if it would OOM. See also http://golang.org/issue/5050 + // "decoding... images can cause huge memory allocations". + continue + } + + // Even if we don't panic, these aren't valid PNG images. + if _, err := Decode(bytes.NewReader(tc.src)); err == nil { + t.Errorf("i=%d: Decode: got nil error, want non-nil", i) + } + } + + if testing.Short() { + t.Skip("skipping tests which allocate large pixel buffers") + } +} + +func benchmarkDecode(b *testing.B, filename string, bytesPerPixel int) { + data, err := os.ReadFile(filename) + if err != nil { + b.Fatal(err) + } + cfg, err := DecodeConfig(bytes.NewReader(data)) + if err != nil { + b.Fatal(err) + } + b.SetBytes(int64(cfg.Width * cfg.Height * bytesPerPixel)) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Decode(bytes.NewReader(data)) + } +} + +func BenchmarkDecodeGray(b *testing.B) { + benchmarkDecode(b, "testdata/benchGray.png", 1) +} + +func BenchmarkDecodeNRGBAGradient(b *testing.B) { + benchmarkDecode(b, "testdata/benchNRGBA-gradient.png", 4) +} + +func BenchmarkDecodeNRGBAOpaque(b *testing.B) { + benchmarkDecode(b, "testdata/benchNRGBA-opaque.png", 4) +} + +func BenchmarkDecodePaletted(b *testing.B) { + benchmarkDecode(b, "testdata/benchPaletted.png", 1) +} + +func BenchmarkDecodeRGB(b *testing.B) { + benchmarkDecode(b, "testdata/benchRGB.png", 4) +} + +func BenchmarkDecodeInterlacing(b *testing.B) { + benchmarkDecode(b, "testdata/benchRGB-interlace.png", 4) +} diff --git a/src/image/png/testdata/benchGray.png b/src/image/png/testdata/benchGray.png Binary files differnew file mode 100644 index 0000000..42bc6c3 --- /dev/null +++ b/src/image/png/testdata/benchGray.png diff --git a/src/image/png/testdata/benchNRGBA-gradient.png b/src/image/png/testdata/benchNRGBA-gradient.png Binary files differnew file mode 100644 index 0000000..961934c --- /dev/null +++ b/src/image/png/testdata/benchNRGBA-gradient.png diff --git a/src/image/png/testdata/benchNRGBA-opaque.png b/src/image/png/testdata/benchNRGBA-opaque.png Binary files differnew file mode 100644 index 0000000..ca4f4a0 --- /dev/null +++ b/src/image/png/testdata/benchNRGBA-opaque.png diff --git a/src/image/png/testdata/benchPaletted.png b/src/image/png/testdata/benchPaletted.png Binary files differnew file mode 100644 index 0000000..4b4d5b9 --- /dev/null +++ b/src/image/png/testdata/benchPaletted.png diff --git a/src/image/png/testdata/benchRGB-interlace.png b/src/image/png/testdata/benchRGB-interlace.png Binary files differnew file mode 100644 index 0000000..b4b5dab --- /dev/null +++ b/src/image/png/testdata/benchRGB-interlace.png diff --git a/src/image/png/testdata/benchRGB.png b/src/image/png/testdata/benchRGB.png Binary files differnew file mode 100644 index 0000000..31ac65a --- /dev/null +++ b/src/image/png/testdata/benchRGB.png diff --git a/src/image/png/testdata/gray-gradient.interlaced.png b/src/image/png/testdata/gray-gradient.interlaced.png Binary files differnew file mode 100644 index 0000000..01f657a --- /dev/null +++ b/src/image/png/testdata/gray-gradient.interlaced.png diff --git a/src/image/png/testdata/gray-gradient.png b/src/image/png/testdata/gray-gradient.png Binary files differnew file mode 100644 index 0000000..6de1cd3 --- /dev/null +++ b/src/image/png/testdata/gray-gradient.png diff --git a/src/image/png/testdata/invalid-crc32.png b/src/image/png/testdata/invalid-crc32.png Binary files differnew file mode 100644 index 0000000..e5be408 --- /dev/null +++ b/src/image/png/testdata/invalid-crc32.png diff --git a/src/image/png/testdata/invalid-noend.png b/src/image/png/testdata/invalid-noend.png Binary files differnew file mode 100644 index 0000000..9137270 --- /dev/null +++ b/src/image/png/testdata/invalid-noend.png diff --git a/src/image/png/testdata/invalid-palette.png b/src/image/png/testdata/invalid-palette.png Binary files differnew file mode 100644 index 0000000..a747e59 --- /dev/null +++ b/src/image/png/testdata/invalid-palette.png diff --git a/src/image/png/testdata/invalid-trunc.png b/src/image/png/testdata/invalid-trunc.png Binary files differnew file mode 100644 index 0000000..d0748cf --- /dev/null +++ b/src/image/png/testdata/invalid-trunc.png diff --git a/src/image/png/testdata/invalid-zlib.png b/src/image/png/testdata/invalid-zlib.png Binary files differnew file mode 100644 index 0000000..c6d051c --- /dev/null +++ b/src/image/png/testdata/invalid-zlib.png diff --git a/src/image/png/testdata/pngsuite/README b/src/image/png/testdata/pngsuite/README new file mode 100644 index 0000000..01d1d89 --- /dev/null +++ b/src/image/png/testdata/pngsuite/README @@ -0,0 +1,20 @@ +The *.png and README.original files in this directory are copied from +libpng.org, specifically contrib/pngsuite/* in libpng 1.6.26. + +README.original gives the following license for those files: + + Permission to use, copy, and distribute these images for any purpose + and without fee is hereby granted. + +The files basn0g01-30.png, basn0g02-29.png and basn0g04-31.png are in fact not +part of pngsuite but were created from files in pngsuite. Their non-power-of-2 +sizes makes them useful for testing bit-depths smaller than a byte. + +basn3a08.png was generated from basn6a08.png using the pngnq tool, which +converted it to the 8-bit paletted image with alpha values in tRNS chunk. + +The *.sng files in this directory were generated from the *.png files by the +sng command-line tool and some hand editing. The files basn0g0{1,2,4}.sng and +ftbbn0g0{1,2,4}.sng were actually generated by first converting the PNG to a +bitdepth of 8 and then running sng on them. basn4a08.sng was generated from a +16-bit rgba version of basn4a08.png rather than the original gray + alpha. diff --git a/src/image/png/testdata/pngsuite/README.original b/src/image/png/testdata/pngsuite/README.original new file mode 100644 index 0000000..714d12c --- /dev/null +++ b/src/image/png/testdata/pngsuite/README.original @@ -0,0 +1,85 @@ + +pngsuite +-------- +(c) Willem van Schaik, 1999 + +Permission to use, copy, and distribute these images for any purpose and +without fee is hereby granted. + +These 15 images are part of the much larger PngSuite test-set of +images, available for developers of PNG supporting software. The +complete set, available at http:/www.schaik.com/pngsuite/, contains +a variety of images to test interlacing, gamma settings, ancillary +chunks, etc. + +The images in this directory represent the basic PNG color-types: +grayscale (1-16 bit deep), full color (8 or 16 bit), paletted +(1-8 bit) and grayscale or color images with alpha channel. You +can use them to test the proper functioning of PNG software. + + filename depth type + ------------ ------ -------------- + basn0g01.png 1-bit grayscale + basn0g02.png 2-bit grayscale + basn0g04.png 4-bit grayscale + basn0g08.png 8-bit grayscale + basn0g16.png 16-bit grayscale + basn2c08.png 8-bit truecolor + basn2c16.png 16-bit truecolor + basn3p01.png 1-bit paletted + basn3p02.png 2-bit paletted + basn3p04.png 4-bit paletted + basn3p08.png 8-bit paletted + basn4a08.png 8-bit gray with alpha + basn4a16.png 16-bit gray with alpha + basn6a08.png 8-bit RGBA + basn6a16.png 16-bit RGBA + +Here is the correct result of typing "pngtest -m *.png" in +this directory: + +Testing basn0g01.png: PASS (524 zero samples) + Filter 0 was used 32 times +Testing basn0g02.png: PASS (448 zero samples) + Filter 0 was used 32 times +Testing basn0g04.png: PASS (520 zero samples) + Filter 0 was used 32 times +Testing basn0g08.png: PASS (3 zero samples) + Filter 1 was used 9 times + Filter 4 was used 23 times +Testing basn0g16.png: PASS (1 zero samples) + Filter 1 was used 1 times + Filter 2 was used 31 times +Testing basn2c08.png: PASS (6 zero samples) + Filter 1 was used 5 times + Filter 4 was used 27 times +Testing basn2c16.png: PASS (592 zero samples) + Filter 1 was used 1 times + Filter 4 was used 31 times +Testing basn3p01.png: PASS (512 zero samples) + Filter 0 was used 32 times +Testing basn3p02.png: PASS (448 zero samples) + Filter 0 was used 32 times +Testing basn3p04.png: PASS (544 zero samples) + Filter 0 was used 32 times +Testing basn3p08.png: PASS (4 zero samples) + Filter 0 was used 32 times +Testing basn4a08.png: PASS (32 zero samples) + Filter 1 was used 1 times + Filter 4 was used 31 times +Testing basn4a16.png: PASS (64 zero samples) + Filter 0 was used 1 times + Filter 1 was used 2 times + Filter 2 was used 1 times + Filter 4 was used 28 times +Testing basn6a08.png: PASS (160 zero samples) + Filter 1 was used 1 times + Filter 4 was used 31 times +Testing basn6a16.png: PASS (1072 zero samples) + Filter 1 was used 4 times + Filter 4 was used 28 times +libpng passes test + +Willem van Schaik +<willem@schaik.com> +October 1999 diff --git a/src/image/png/testdata/pngsuite/basn0g01-30.png b/src/image/png/testdata/pngsuite/basn0g01-30.png Binary files differnew file mode 100644 index 0000000..007750c --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g01-30.png diff --git a/src/image/png/testdata/pngsuite/basn0g01-30.sng b/src/image/png/testdata/pngsuite/basn0g01-30.sng new file mode 100644 index 0000000..7fa3571 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g01-30.sng @@ -0,0 +1,39 @@ +#SNG: from basn0g01-30.png +IHDR { + width: 30; height: 30; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00 +ffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffffffff000000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffffff00000000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffff0000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffffffff000000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffffff00000000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffff0000000000000000 +ffffffffff0000000000000000ffffffffffffffff000000000000000000 +ffffffffff0000000000000000ffffffffffffff00000000000000000000 +ffffffffffff0000ffff0000ffffffffffffff0000000000000000000000 +ffffffffffff0000ffff0000ffffffffffff000000000000000000000000 +ffffffffffffffffffffffffffffffffff00000000000000000000000000 +ffffffffffffffffffffffffffffffff0000000000000000000000000000 +ffffffffffffffffffffffffffffff000000000000000000000000000000 +ffffffffffffffffffffffffffff00000000000000000000000000000000 +ffffffffffffffffffffffffff00000000000000ffffffffffffff000000 +ffffffffffffffffffffffff0000000000000000ffffffffffffff000000 +ffffffffffffffffffffff000000000000000000ffff00000000ffff0000 +ffffffffffffffffffff00000000000000000000ffff00000000ffff0000 +ffffffffffffffffff0000000000000000000000ffffffffffffff000000 +ffffffffffffffff000000000000000000000000ffffffffffffff000000 +ffffffffffffff00000000000000000000000000ffff00000000ffff0000 +ffffffffffff0000000000000000000000000000ffff00000000ffff0000 +ffffffffff000000000000000000000000000000ffffffffffffff000000 +ffffffff00000000000000000000000000000000ffffffffffffff000000 +ffffff000000000000000000000000000000000000000000000000000000 +ffff00000000000000000000000000000000000000000000000000000000 +} diff --git a/src/image/png/testdata/pngsuite/basn0g01.png b/src/image/png/testdata/pngsuite/basn0g01.png Binary files differnew file mode 100644 index 0000000..e31e1c7 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g01.png diff --git a/src/image/png/testdata/pngsuite/basn0g01.sng b/src/image/png/testdata/pngsuite/basn0g01.sng new file mode 100644 index 0000000..2ce069d --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g01.sng @@ -0,0 +1,41 @@ +#SNG: from basn0g01.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00 +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0000 +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff000000 +ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffffffff0000000000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffffff000000000000 +ffffffff0000ffffffffffff0000ffffffffffffffffffffff00000000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffffffff0000000000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffffff000000000000000000 +ffffffff0000ffff0000ffff0000ffffffffffffffff00000000000000000000 +ffffffffff0000000000000000ffffffffffffffff0000000000000000000000 +ffffffffff0000000000000000ffffffffffffff000000000000000000000000 +ffffffffffff0000ffff0000ffffffffffffff00000000000000000000000000 +ffffffffffff0000ffff0000ffffffffffff0000000000000000000000000000 +ffffffffffffffffffffffffffffffffff000000000000000000000000000000 +ffffffffffffffffffffffffffffffff00000000000000000000000000000000 +ffffffffffffffffffffffffffffff0000000000000000000000000000000000 +ffffffffffffffffffffffffffff000000000000000000000000000000000000 +ffffffffffffffffffffffffff00000000000000ffffffffffffff0000000000 +ffffffffffffffffffffffff0000000000000000ffffffffffffff0000000000 +ffffffffffffffffffffff000000000000000000ffff00000000ffff00000000 +ffffffffffffffffffff00000000000000000000ffff00000000ffff00000000 +ffffffffffffffffff0000000000000000000000ffffffffffffff0000000000 +ffffffffffffffff000000000000000000000000ffffffffffffff0000000000 +ffffffffffffff00000000000000000000000000ffff00000000ffff00000000 +ffffffffffff0000000000000000000000000000ffff00000000ffff00000000 +ffffffffff000000000000000000000000000000ffffffffffffff0000000000 +ffffffff00000000000000000000000000000000ffffffffffffff0000000000 +ffffff0000000000000000000000000000000000000000000000000000000000 +ffff000000000000000000000000000000000000000000000000000000000000 +ff00000000000000000000000000000000000000000000000000000000000000 +0000000000000000000000000000000000000000000000000000000000000000 +} diff --git a/src/image/png/testdata/pngsuite/basn0g02-29.png b/src/image/png/testdata/pngsuite/basn0g02-29.png Binary files differnew file mode 100644 index 0000000..d17d8f8 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g02-29.png diff --git a/src/image/png/testdata/pngsuite/basn0g02-29.sng b/src/image/png/testdata/pngsuite/basn0g02-29.sng new file mode 100644 index 0000000..afb5dba --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g02-29.sng @@ -0,0 +1,38 @@ +#SNG: from basn0g02-29.png +IHDR { + width: 29; height: 29; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aa +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaff +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055 +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aa +} diff --git a/src/image/png/testdata/pngsuite/basn0g02.png b/src/image/png/testdata/pngsuite/basn0g02.png Binary files differnew file mode 100644 index 0000000..68809dd --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g02.png diff --git a/src/image/png/testdata/pngsuite/basn0g02.sng b/src/image/png/testdata/pngsuite/basn0g02.sng new file mode 100644 index 0000000..bb53d75 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g02.sng @@ -0,0 +1,41 @@ +#SNG: from basn0g02.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +55555555aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff00000000 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +aaaaaaaaffffffff0000000055555555aaaaaaaaffffffff0000000055555555 +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +ffffffff0000000055555555aaaaaaaaffffffff0000000055555555aaaaaaaa +} diff --git a/src/image/png/testdata/pngsuite/basn0g04-31.png b/src/image/png/testdata/pngsuite/basn0g04-31.png Binary files differnew file mode 100644 index 0000000..e30644d --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g04-31.png diff --git a/src/image/png/testdata/pngsuite/basn0g04-31.sng b/src/image/png/testdata/pngsuite/basn0g04-31.sng new file mode 100644 index 0000000..7f7948e --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g04-31.sng @@ -0,0 +1,40 @@ +#SNG: from basn0g04-31.png +IHDR { + width: 31; height: 31; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +00000000111111112222222233333333444444445555555566666666777777 +00000000111111112222222233333333444444445555555566666666777777 +00000000111111112222222233333333444444445555555566666666777777 +00000000111111112222222233333333444444445555555566666666777777 +11111111222222223333333344444444555555556666666677777777888888 +11111111222222223333333344444444555555556666666677777777888888 +11111111222222223333333344444444555555556666666677777777888888 +11111111222222223333333344444444555555556666666677777777888888 +22222222333333334444444455555555666666667777777788888888999999 +22222222333333334444444455555555666666667777777788888888999999 +22222222333333334444444455555555666666667777777788888888999999 +22222222333333334444444455555555666666667777777788888888999999 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--git a/src/image/png/testdata/pngsuite/basn0g08.png b/src/image/png/testdata/pngsuite/basn0g08.png Binary files differnew file mode 100644 index 0000000..bf522ee --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g08.png diff --git a/src/image/png/testdata/pngsuite/basn0g08.sng b/src/image/png/testdata/pngsuite/basn0g08.sng new file mode 100644 index 0000000..7389eb7 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g08.sng @@ -0,0 +1,41 @@ +#SNG: from basn0g08.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f +202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f +404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f +606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f +808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f +a0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebf 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a/src/image/png/testdata/pngsuite/basn0g16.sng b/src/image/png/testdata/pngsuite/basn0g16.sng new file mode 100644 index 0000000..922391a --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn0g16.sng @@ -0,0 +1,41 @@ +#SNG: from basn0g16.png +IHDR { + width: 32; height: 32; bitdepth: 16; + using grayscale; +} +gAMA {1.0000} +IMAGE { + pixels hex +0000 0900 1200 1b00 2400 2d00 3600 3f00 4800 5100 5a00 6300 6c00 7500 7e00 8700 9000 9900 a200 ab00 b400 bd00 c600 cf00 d800 e100 ea00 f300 fc00 f0ff d5ff baff +0200 0b00 1400 1d00 2600 2f00 3800 4100 4a00 5300 5c00 6500 6e00 7700 8000 8900 9200 9b00 a400 ad00 b600 bf00 c800 d100 da00 e300 ec00 f500 fe00 eaff cfff b4ff +0400 0d00 1600 1f00 2800 3100 3a00 4300 4c00 5500 5e00 6700 7000 7900 8200 8b00 9400 9d00 a600 af00 b800 c100 ca00 d300 dc00 e500 ee00 f700 ffff e4ff c9ff aeff +0600 0f00 1800 2100 2a00 3300 3c00 4500 4e00 5700 6000 6900 7200 7b00 8400 8d00 9600 9f00 a800 b100 ba00 c300 cc00 d500 de00 e700 f000 f900 f9ff deff c3ff a8ff +0800 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f200 fb00 f3ff d8ff bdff a2ff 87ff 6cff 51ff 36ff +2e00 3700 4000 4900 5200 5b00 6400 6d00 7600 7f00 8800 9100 9a00 a300 ac00 b500 be00 c700 d000 d900 e200 eb00 f400 fd00 edff d2ff b7ff 9cff 81ff 66ff 4bff 30ff +3000 3900 4200 4b00 5400 5d00 6600 6f00 7800 8100 8a00 9300 9c00 a500 ae00 b700 c000 c900 d200 db00 e400 ed00 f600 ff00 e7ff ccff b1ff 96ff 7bff 60ff 45ff 2aff +3200 3b00 4400 4d00 5600 5f00 6800 7100 7a00 8300 8c00 9500 9e00 a700 b000 b900 c200 cb00 d400 dd00 e600 ef00 f800 fcff e1ff c6ff abff 90ff 75ff 5aff 3fff 24ff +3400 3d00 4600 4f00 5800 6100 6a00 7300 7c00 8500 8e00 9700 a000 a900 b200 bb00 c400 cd00 d600 df00 e800 f100 fa00 f6ff dbff c0ff a5ff 8aff 6fff 54ff 39ff 1eff +3600 3f00 4800 5100 5a00 6300 6c00 7500 7e00 8700 9000 9900 a200 ab00 b400 bd00 c600 cf00 d800 e100 ea00 f300 fc00 f0ff d5ff baff 9fff 84ff 69ff 4eff 33ff 18ff +3800 4100 4a00 5300 5c00 6500 6e00 7700 8000 8900 9200 9b00 a400 ad00 b600 bf00 c800 d100 da00 e300 ec00 f500 fe00 eaff cfff b4ff 99ff 7eff 63ff 48ff 2dff 12ff +3a00 4300 4c00 5500 5e00 6700 7000 7900 8200 8b00 9400 9d00 a600 af00 b800 c100 ca00 d300 dc00 e500 ee00 f700 ffff e4ff c9ff aeff 93ff 78ff 5dff 42ff 27ff 0cff +3c00 4500 4e00 5700 6000 6900 7200 7b00 8400 8d00 9600 9f00 a800 b100 ba00 c300 cc00 d500 de00 e700 f000 f900 f9ff deff c3ff a8ff 8dff 72ff 57ff 3cff 21ff 06ff +3e00 4700 5000 5900 6200 6b00 7400 7d00 8600 8f00 9800 a100 aa00 b300 bc00 c500 ce00 d700 e000 e900 f200 fb00 f3ff d8ff bdff a2ff 87ff 6cff 51ff 36ff 1bff 00ff +} diff --git a/src/image/png/testdata/pngsuite/basn2c08.png b/src/image/png/testdata/pngsuite/basn2c08.png Binary files differnew file mode 100644 index 0000000..21d2f91 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn2c08.png diff --git a/src/image/png/testdata/pngsuite/basn2c08.sng b/src/image/png/testdata/pngsuite/basn2c08.sng new file mode 100644 index 0000000..09a6131 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn2c08.sng @@ -0,0 +1,41 @@ +#SNG: from basn2c08.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using color; +} +gAMA {1.0000} +IMAGE { + pixels hex +ffffff fffffe fffffd fffffc fffffb fffffa fffff9 fffff8 fffff7 fffff6 fffff5 fffff4 fffff3 fffff2 fffff1 fffff0 ffffef ffffee ffffed ffffec ffffeb ffffea ffffe9 ffffe8 ffffe7 ffffe6 ffffe5 ffffe4 ffffe3 ffffe2 ffffe1 ffffe0 +ffffdf ffffde ffffdd ffffdc ffffdb ffffda ffffd9 ffffd8 ffffd7 ffffd6 ffffd5 ffffd4 ffffd3 ffffd2 ffffd1 ffffd0 ffffcf ffffce ffffcd ffffcc ffffcb ffffca ffffc9 ffffc8 ffffc7 ffffc6 ffffc5 ffffc4 ffffc3 ffffc2 ffffc1 ffffc0 +ffffbf ffffbe ffffbd ffffbc ffffbb ffffba ffffb9 ffffb8 ffffb7 ffffb6 ffffb5 ffffb4 ffffb3 ffffb2 ffffb1 ffffb0 ffffaf ffffae ffffad ffffac ffffab ffffaa ffffa9 ffffa8 ffffa7 ffffa6 ffffa5 ffffa4 ffffa3 ffffa2 ffffa1 ffffa0 +ffff9f ffff9e ffff9d ffff9c ffff9b ffff9a ffff99 ffff98 ffff97 ffff96 ffff95 ffff94 ffff93 ffff92 ffff91 ffff90 ffff8f ffff8e ffff8d ffff8c ffff8b ffff8a ffff89 ffff88 ffff87 ffff86 ffff85 ffff84 ffff83 ffff82 ffff81 ffff80 +ffff7f 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(255,134, 7) # rgb = (0xff,0x86,0x07) + ( 0,136,249) # rgb = (0x00,0x88,0xf9) + (219,140, 6) # rgb = (0xdb,0x8c,0x06) + ( 0,140,252) # rgb = (0x00,0x8c,0xfc) + ( 0,140,255) # rgb = (0x00,0x8c,0xff) + ( 1,142,136) # rgb = (0x01,0x8e,0x88) + (255,143, 7) # rgb = (0xff,0x8f,0x07) + (243,150, 7) # rgb = (0xf3,0x96,0x07) + (198,152, 7) # rgb = (0xc6,0x98,0x07) + (165,153, 7) # rgb = (0xa5,0x99,0x07) + ( 0,157,255) # rgb = (0x00,0x9d,0xff) + (255,158, 7) # rgb = (0xff,0x9e,0x07) + ( 70,159, 4) # rgb = (0x46,0x9f,0x04) + ( 0,160,251) # rgb = (0x00,0xa0,0xfb) + (203,163, 6) # rgb = (0xcb,0xa3,0x06) + ( 0,163,239) # rgb = (0x00,0xa3,0xef) + ( 1,164,178) # rgb = (0x01,0xa4,0xb2) + (255,166, 7) # rgb = (0xff,0xa6,0x07) + ( 1,169,165) # rgb = (0x01,0xa9,0xa5) + ( 1,170,255) # rgb = (0x01,0xaa,0xff) + (232,172, 6) # rgb = (0xe8,0xac,0x06) + (255,175, 7) # rgb = (0xff,0xaf,0x07) + (185,176,131) # rgb = (0xb9,0xb0,0x83) + ( 1,179,225) # rgb = (0x01,0xb3,0xe1) + (188,179,118) # rgb = (0xbc,0xb3,0x76) + (199,180, 6) # rgb = (0xc7,0xb4,0x06) + ( 1,182,255) # rgb = (0x01,0xb6,0xff) + ( 1,184,249) # rgb = (0x01,0xb8,0xf9) + (255,184, 7) # rgb = (0xff,0xb8,0x07) + (207,186, 71) # rgb = (0xcf,0xba,0x47) + (193,187, 6) # rgb = (0xc1,0xbb,0x06) + (253,191, 7) # rgb = (0xfd,0xbf,0x07) + (218,193, 48) # rgb = (0xda,0xc1,0x30) + ( 1,193,157) # rgb = (0x01,0xc1,0x9d) + ( 1,196,244) # rgb = (0x01,0xc4,0xf4) + ( 1,196,254) # rgb = (0x01,0xc4,0xfe) + ( 48,199, 3) # rgb = (0x30,0xc7,0x03) + (164,199, 5) # rgb = (0xa4,0xc7,0x05) + (220,202, 6) # rgb = (0xdc,0xca,0x06) + (253,203, 7) # rgb = (0xfd,0xcb,0x07) + ( 1,204,204) # rgb = (0x01,0xcc,0xcc) + (251,209, 7) # rgb = (0xfb,0xd1,0x07) + (231,208, 24) # rgb = (0xe7,0xd0,0x18) + ( 1,210,254) # rgb = (0x01,0xd2,0xfe) + ( 2,211,146) # rgb = (0x02,0xd3,0x92) + ( 1,212,156) # rgb = (0x01,0xd4,0x9c) + ( 1,213,252) # rgb = (0x01,0xd5,0xfc) + (237,219, 15) # rgb = (0xed,0xdb,0x0f) + ( 1,218,240) # rgb = (0x01,0xda,0xf0) + (165,220, 5) # rgb = (0xa5,0xdc,0x05) + ( 1,221,250) # rgb = (0x01,0xdd,0xfa) + (249,221, 6) # rgb = (0xf9,0xdd,0x06) + (146,222, 4) # rgb = (0x92,0xde,0x04) + ( 1,224,184) # rgb = (0x01,0xe0,0xb8) + ( 2,224,155) # rgb = (0x02,0xe0,0x9b) + (244,225, 10) # rgb = (0xf4,0xe1,0x0a) + (249,227, 7) # rgb = (0xf9,0xe3,0x07) + ( 2,229,133) # rgb = (0x02,0xe5,0x85) + (192,228, 6) # rgb = (0xc0,0xe4,0x06) + ( 37,230, 3) # rgb = (0x25,0xe6,0x03) + (246,230, 7) # rgb = (0xf6,0xe6,0x07) + (143,232, 4) # rgb = (0x8f,0xe8,0x04) + (244,233, 8) # rgb = (0xf4,0xe9,0x08) + ( 2,236,139) # rgb = (0x02,0xec,0x8b) + ( 1,236,227) # rgb = (0x01,0xec,0xe3) + ( 1,238,238) # rgb = (0x01,0xee,0xee) + (101,241, 4) # rgb = (0x65,0xf1,0x04) + ( 1,241,218) # rgb = (0x01,0xf1,0xda) + ( 1,240,232) # rgb = (0x01,0xf0,0xe8) + (167,240, 5) # rgb = (0xa7,0xf0,0x05) + ( 27,243, 2) # rgb = (0x1b,0xf3,0x02) + (126,243, 4) # rgb = (0x7e,0xf3,0x04) + ( 2,246,113) # rgb = (0x02,0xf6,0x71) + (133,248, 5) # rgb = (0x85,0xf8,0x05) + ( 22,250, 1) # rgb = (0x16,0xfa,0x01) + ( 2,249,219) # rgb = (0x02,0xf9,0xdb) + (148,250, 5) # rgb = (0x94,0xfa,0x05) + ( 2,250,199) # rgb = (0x02,0xfa,0xc7) + (183,252, 5) # rgb = (0xb7,0xfc,0x05) + (176,252, 5) # rgb = (0xb0,0xfc,0x05) + ( 2,252,211) # rgb = (0x02,0xfc,0xd3) + ( 2,252,190) # rgb = (0x02,0xfc,0xbe) + (164,251, 5) # rgb = (0xa4,0xfb,0x05) + ( 12,254,128) # rgb = (0x0c,0xfe,0x80) + (192,253, 5) # rgb = (0xc0,0xfd,0x05) + (164,253, 5) # rgb = (0xa4,0xfd,0x05) + ( 26,254, 85) # rgb = (0x1a,0xfe,0x55) + ( 14,254, 1) # rgb = (0x0e,0xfe,0x01) + (133,253, 5) # rgb = (0x85,0xfd,0x05) + ( 4,253,180) # rgb = (0x04,0xfd,0xb4) + (196,253, 5) # rgb = (0xc4,0xfd,0x05) + ( 2,253,198) # rgb = (0x02,0xfd,0xc6) + ( 3,255, 91) # rgb = (0x03,0xff,0x5b) + ( 3,255, 80) # rgb = (0x03,0xff,0x50) + (186,255, 5) # rgb = (0xba,0xff,0x05) + ( 9,255, 2) # rgb = (0x09,0xff,0x02) + ( 3,255,118) # rgb = (0x03,0xff,0x76) + ( 9,255, 3) # rgb = (0x09,0xff,0x03) + ( 10,255, 1) # rgb = (0x0a,0xff,0x01) + ( 3,255, 76) # rgb = (0x03,0xff,0x4c) + ( 3,255, 86) # rgb = (0x03,0xff,0x56) + ( 3,255, 82) # rgb = (0x03,0xff,0x52) + ( 13,255, 1) # rgb = (0x0d,0xff,0x01) + ( 3,255, 49) # rgb = (0x03,0xff,0x31) + ( 3,255,101) # rgb = (0x03,0xff,0x65) + ( 61,255, 32) # rgb = (0x3d,0xff,0x20) + (129,255, 5) # rgb = (0x81,0xff,0x05) + (177,255, 5) # rgb = (0xb1,0xff,0x05) + ( 3,255, 37) # rgb = (0x03,0xff,0x25) + (149,255, 5) # rgb = (0x95,0xff,0x05) + ( 7,255, 6) # rgb = (0x07,0xff,0x06) + (192,255, 5) # rgb = (0xc0,0xff,0x05) + ( 2,255,131) # rgb = (0x02,0xff,0x83) + ( 3,255, 98) # rgb = (0x03,0xff,0x62) + ( 85,255, 11) # rgb = (0x55,0xff,0x0b) + ( 2,255,163) # rgb = (0x02,0xff,0xa3) + ( 2,255,149) # rgb = (0x02,0xff,0x95) + ( 4,255, 23) # rgb = (0x04,0xff,0x17) + ( 6,255, 12) # rgb = (0x06,0xff,0x0c) + ( 3,255, 67) # rgb = (0x03,0xff,0x43) + (160,255, 5) # rgb = (0xa0,0xff,0x05) + (119,255, 6) # rgb = (0x77,0xff,0x06) + (102,255, 8) # rgb = (0x66,0xff,0x08) + (255,255,255) # rgb = (0xff,0xff,0xff) + (254,254,254) # rgb 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(0xe7,0xe7,0xe7) + (229,229,229) # rgb = (0xe5,0xe5,0xe5) + (229,229,229) # rgb = (0xe5,0xe5,0xe5) + (227,227,227) # rgb = (0xe3,0xe3,0xe3) + (226,226,226) # rgb = (0xe2,0xe2,0xe2) + (226,226,226) # rgb = (0xe2,0xe2,0xe2) + (224,224,224) # rgb = (0xe0,0xe0,0xe0) + (224,224,224) # rgb = (0xe0,0xe0,0xe0) + (222,222,222) # rgb = (0xde,0xde,0xde) + (222,222,222) # rgb = (0xde,0xde,0xde) + (220,220,220) # rgb = (0xdc,0xdc,0xdc) + (219,219,219) # rgb = (0xdb,0xdb,0xdb) + (219,219,219) # rgb = (0xdb,0xdb,0xdb) + (217,217,217) # rgb = (0xd9,0xd9,0xd9) + (217,217,217) # rgb = (0xd9,0xd9,0xd9) + (215,215,215) # rgb = (0xd7,0xd7,0xd7) + (214,214,214) # rgb = (0xd6,0xd6,0xd6) + (214,214,214) # rgb = (0xd6,0xd6,0xd6) + (212,212,212) # rgb = (0xd4,0xd4,0xd4) + (212,212,212) # rgb = (0xd4,0xd4,0xd4) + (210,210,210) # rgb = (0xd2,0xd2,0xd2) + (209,209,209) # rgb = (0xd1,0xd1,0xd1) + (209,209,209) # rgb = (0xd1,0xd1,0xd1) + (207,207,207) # rgb = (0xcf,0xcf,0xcf) + (205,205,205) # rgb = (0xcd,0xcd,0xcd) 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a/src/image/png/testdata/pngsuite/basn6a16.png b/src/image/png/testdata/pngsuite/basn6a16.png Binary files differnew file mode 100644 index 0000000..a9bf3cb --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn6a16.png diff --git a/src/image/png/testdata/pngsuite/basn6a16.sng b/src/image/png/testdata/pngsuite/basn6a16.sng new file mode 100644 index 0000000..13c70a4 --- /dev/null +++ b/src/image/png/testdata/pngsuite/basn6a16.sng @@ -0,0 +1,41 @@ +#SNG: from basn6a16.png +IHDR { + width: 32; height: 32; bitdepth: 16; + using color alpha; +} +gAMA {1.0000} +IMAGE { + pixels hex +ffffffff00000000 f7bcffff00000000 ef7affff00000000 e738ffff00000000 def6ffff00000000 d6b4ffff00000000 ce72ffff00000000 c630ffff00000000 bdeeffff00000000 b5acffff00000000 ad6affff00000000 a528ffff00000000 9ce6ffff00000000 94a4ffff00000000 8c62ffff00000000 8420ffff00000000 7bdeffff00000000 739cffff00000000 6b5affff00000000 6318ffff00000000 5ad6ffff00000000 5294ffff00000000 4a52ffff00000000 4210ffff00000000 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b/src/image/png/testdata/pngsuite/ftbbn0g04.png diff --git a/src/image/png/testdata/pngsuite/ftbbn0g04.sng b/src/image/png/testdata/pngsuite/ftbbn0g04.sng new file mode 100644 index 0000000..518ba6c --- /dev/null +++ b/src/image/png/testdata/pngsuite/ftbbn0g04.sng @@ -0,0 +1,45 @@ +#SNG: from ftbbn0g04.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using grayscale; +} +gAMA {1.0000} +bKGD {gray: 0;} +tRNS { + gray: 255; +} +IMAGE { + pixels hex +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff +ffffffffffffffffffffffffffffddcceeffffffffffffffffffffffffffffff +ffffffffffffffffffffffeebb776655446699ddffffffffffffffffffffffff +ffffffffffffffffeebb886666553322222222335599ccffffffffffffffffff +ffffffffffeecc997766554433333322334422112222336699ccffffffffffff +ffffffcc997777664433333333444433334444332233335566777799cceeffff +ffffcc777777775533333344556655444444444444332266777777776699ffff 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+++ b/src/image/png/testdata/pngsuite/ftbbn2c16.sng @@ -0,0 +1,45 @@ +#SNG: from ftbbn2c16.png +IHDR { + width: 32; height: 32; bitdepth: 16; + using color; +} +gAMA {1.0000} +bKGD {red: 0; green: 0; blue: 65535;} +tRNS { + red: 65535; green: 65535; blue: 65535; +} +IMAGE { + pixels hex +ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff +ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff ffffffffffff 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Binary files differnew file mode 100644 index 0000000..99bdeed --- /dev/null +++ b/src/image/png/testdata/pngsuite/ftbwn0g16.png diff --git a/src/image/png/testdata/pngsuite/ftbwn0g16.sng b/src/image/png/testdata/pngsuite/ftbwn0g16.sng new file mode 100644 index 0000000..3fca307 --- /dev/null +++ b/src/image/png/testdata/pngsuite/ftbwn0g16.sng @@ -0,0 +1,45 @@ +#SNG: from ftbwn0g16.png +IHDR { + width: 32; height: 32; bitdepth: 16; + using grayscale; +} +gAMA {1.0000} +bKGD {gray: 65535;} +tRNS { + gray: 65535; +} +IMAGE { + pixels hex +ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff +ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff +ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff e3e3 c9c9 f1f1 ffff ffff ffff ffff ffff ffff ffff ffff ffff ffff 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b/src/image/png/testdata/pngsuite/ftbwn3p08.sng new file mode 100644 index 0000000..7b5aff6 --- /dev/null +++ b/src/image/png/testdata/pngsuite/ftbwn3p08.sng @@ -0,0 +1,291 @@ +#SNG: from ftbwn3p08.png +IHDR { + width: 32; height: 32; bitdepth: 8; + using color palette; +} +gAMA {1.0000} +PLTE { + (255,255,255) # rgb = (0xff,0xff,0xff) grey100 + (128, 86, 86) # rgb = (0x80,0x56,0x56) + (181,181,184) # rgb = (0xb5,0xb5,0xb8) + (168, 66, 66) # rgb = (0xa8,0x42,0x42) + (159,159,159) # rgb = (0x9f,0x9f,0x9f) + (177, 32, 32) # rgb = (0xb1,0x20,0x20) + (139, 21, 21) # rgb = (0x8b,0x15,0x15) + (157,157,157) # rgb = (0x9d,0x9d,0x9d) + ( 27, 27, 89) # rgb = (0x1b,0x1b,0x59) + (155,155,155) # rgb = (0x9b,0x9b,0x9b) + ( 0, 0,132) # rgb = (0x00,0x00,0x84) + (153,153,153) # rgb = (0x99,0x99,0x99) grey60 + (143,167,143) # rgb = (0x8f,0xa7,0x8f) + (151,151,151) # rgb = (0x97,0x97,0x97) + (149,149,149) # rgb = (0x95,0x95,0x95) + (147,147,147) # rgb = (0x93,0x93,0x93) + ( 41, 41, 86) # rgb = (0x29,0x29,0x56) + (145,145,145) # rgb = (0x91,0x91,0x91) grey57 + ( 0, 0,155) # rgb = (0x00,0x00,0x9b) + (143,143,143) # rgb = (0x8f,0x8f,0x8f) grey56 + (139,149,139) # rgb = (0x8b,0x95,0x8b) + ( 46, 46,167) # rgb = (0x2e,0x2e,0xa7) + (141,141,141) # rgb = (0x8d,0x8d,0x8d) + (128, 0, 0) # rgb = (0x80,0x00,0x00) + (139,139,139) # rgb = (0x8b,0x8b,0x8b) + (185, 0, 0) # rgb = (0xb9,0x00,0x00) + (137,137,137) # rgb = (0x89,0x89,0x89) + ( 12, 12,213) # rgb = (0x0c,0x0c,0xd5) + (120,117,117) # rgb = (0x78,0x75,0x75) + (135,135,135) # rgb = (0x87,0x87,0x87) grey53 + ( 0, 0,178) # rgb = (0x00,0x00,0xb2) + (133,133,133) # rgb = (0x85,0x85,0x85) grey52 + (165, 0, 0) # rgb = (0xa5,0x00,0x00) + (222, 0, 0) # rgb = (0xde,0x00,0x00) + (129,129,129) # rgb = (0x81,0x81,0x81) + (127,127,127) # rgb = (0x7f,0x7f,0x7f) grey50 + ( 0, 0,158) # rgb = (0x00,0x00,0x9e) + (125,125,125) # rgb = (0x7d,0x7d,0x7d) grey49 + ( 0, 0,201) # rgb = (0x00,0x00,0xc9) + (123,123,123) # rgb = (0x7b,0x7b,0x7b) + 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+0000000000000000000077b654a29b18acc24a722a5500000000000000000000 +0000000000000000000000d78a9f9e9b3548c38ac90000000000000000000000 +00000000000000000000000000ef1f9e3cc20200000000000000000000000000 +0000000000000000000000000000e89736780000000000000000000000000000 +00000000000000000000000000000060e0000000000000000000000000000000 +0000000000000000000000000000000000000000000000000000000000000000 +} diff --git a/src/image/png/writer.go b/src/image/png/writer.go new file mode 100644 index 0000000..cbcdb9e --- /dev/null +++ b/src/image/png/writer.go @@ -0,0 +1,636 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png + +import ( + "bufio" + "compress/zlib" + "encoding/binary" + "hash/crc32" + "image" + "image/color" + "io" + "strconv" +) + +// Encoder configures encoding PNG images. +type Encoder struct { + CompressionLevel CompressionLevel + + // BufferPool optionally specifies a buffer pool to get temporary + // EncoderBuffers when encoding an image. + BufferPool EncoderBufferPool +} + +// EncoderBufferPool is an interface for getting and returning temporary +// instances of the EncoderBuffer struct. This can be used to reuse buffers +// when encoding multiple images. +type EncoderBufferPool interface { + Get() *EncoderBuffer + Put(*EncoderBuffer) +} + +// EncoderBuffer holds the buffers used for encoding PNG images. +type EncoderBuffer encoder + +type encoder struct { + enc *Encoder + w io.Writer + m image.Image + cb int + err error + header [8]byte + footer [4]byte + tmp [4 * 256]byte + cr [nFilter][]uint8 + pr []uint8 + zw *zlib.Writer + zwLevel int + bw *bufio.Writer +} + +// CompressionLevel indicates the compression level. +type CompressionLevel int + +const ( + DefaultCompression CompressionLevel = 0 + NoCompression CompressionLevel = -1 + BestSpeed CompressionLevel = -2 + BestCompression CompressionLevel = -3 + + // Positive CompressionLevel values are reserved to mean a numeric zlib + // compression level, although that is not implemented yet. +) + +type opaquer interface { + Opaque() bool +} + +// Returns whether or not the image is fully opaque. +func opaque(m image.Image) bool { + if o, ok := m.(opaquer); ok { + return o.Opaque() + } + b := m.Bounds() + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + _, _, _, a := m.At(x, y).RGBA() + if a != 0xffff { + return false + } + } + } + return true +} + +// The absolute value of a byte interpreted as a signed int8. +func abs8(d uint8) int { + if d < 128 { + return int(d) + } + return 256 - int(d) +} + +func (e *encoder) writeChunk(b []byte, name string) { + if e.err != nil { + return + } + n := uint32(len(b)) + if int(n) != len(b) { + e.err = UnsupportedError(name + " chunk is too large: " + strconv.Itoa(len(b))) + return + } + binary.BigEndian.PutUint32(e.header[:4], n) + e.header[4] = name[0] + e.header[5] = name[1] + e.header[6] = name[2] + e.header[7] = name[3] + crc := crc32.NewIEEE() + crc.Write(e.header[4:8]) + crc.Write(b) + binary.BigEndian.PutUint32(e.footer[:4], crc.Sum32()) + + _, e.err = e.w.Write(e.header[:8]) + if e.err != nil { + return + } + _, e.err = e.w.Write(b) + if e.err != nil { + return + } + _, e.err = e.w.Write(e.footer[:4]) +} + +func (e *encoder) writeIHDR() { + b := e.m.Bounds() + binary.BigEndian.PutUint32(e.tmp[0:4], uint32(b.Dx())) + binary.BigEndian.PutUint32(e.tmp[4:8], uint32(b.Dy())) + // Set bit depth and color type. + switch e.cb { + case cbG8: + e.tmp[8] = 8 + e.tmp[9] = ctGrayscale + case cbTC8: + e.tmp[8] = 8 + e.tmp[9] = ctTrueColor + case cbP8: + e.tmp[8] = 8 + e.tmp[9] = ctPaletted + case cbP4: + e.tmp[8] = 4 + e.tmp[9] = ctPaletted + case cbP2: + e.tmp[8] = 2 + e.tmp[9] = ctPaletted + case cbP1: + e.tmp[8] = 1 + e.tmp[9] = ctPaletted + case cbTCA8: + e.tmp[8] = 8 + e.tmp[9] = ctTrueColorAlpha + case cbG16: + e.tmp[8] = 16 + e.tmp[9] = ctGrayscale + case cbTC16: + e.tmp[8] = 16 + e.tmp[9] = ctTrueColor + case cbTCA16: + e.tmp[8] = 16 + e.tmp[9] = ctTrueColorAlpha + } + e.tmp[10] = 0 // default compression method + e.tmp[11] = 0 // default filter method + e.tmp[12] = 0 // non-interlaced + e.writeChunk(e.tmp[:13], "IHDR") +} + +func (e *encoder) writePLTEAndTRNS(p color.Palette) { + if len(p) < 1 || len(p) > 256 { + e.err = FormatError("bad palette length: " + strconv.Itoa(len(p))) + return + } + last := -1 + for i, c := range p { + c1 := color.NRGBAModel.Convert(c).(color.NRGBA) + e.tmp[3*i+0] = c1.R + e.tmp[3*i+1] = c1.G + e.tmp[3*i+2] = c1.B + if c1.A != 0xff { + last = i + } + e.tmp[3*256+i] = c1.A + } + e.writeChunk(e.tmp[:3*len(p)], "PLTE") + if last != -1 { + e.writeChunk(e.tmp[3*256:3*256+1+last], "tRNS") + } +} + +// An encoder is an io.Writer that satisfies writes by writing PNG IDAT chunks, +// including an 8-byte header and 4-byte CRC checksum per Write call. Such calls +// should be relatively infrequent, since writeIDATs uses a bufio.Writer. +// +// This method should only be called from writeIDATs (via writeImage). +// No other code should treat an encoder as an io.Writer. +func (e *encoder) Write(b []byte) (int, error) { + e.writeChunk(b, "IDAT") + if e.err != nil { + return 0, e.err + } + return len(b), nil +} + +// Chooses the filter to use for encoding the current row, and applies it. +// The return value is the index of the filter and also of the row in cr that has had it applied. +func filter(cr *[nFilter][]byte, pr []byte, bpp int) int { + // We try all five filter types, and pick the one that minimizes the sum of absolute differences. + // This is the same heuristic that libpng uses, although the filters are attempted in order of + // estimated most likely to be minimal (ftUp, ftPaeth, ftNone, ftSub, ftAverage), rather than + // in their enumeration order (ftNone, ftSub, ftUp, ftAverage, ftPaeth). + cdat0 := cr[0][1:] + cdat1 := cr[1][1:] + cdat2 := cr[2][1:] + cdat3 := cr[3][1:] + cdat4 := cr[4][1:] + pdat := pr[1:] + n := len(cdat0) + + // The up filter. + sum := 0 + for i := 0; i < n; i++ { + cdat2[i] = cdat0[i] - pdat[i] + sum += abs8(cdat2[i]) + } + best := sum + filter := ftUp + + // The Paeth filter. + sum = 0 + for i := 0; i < bpp; i++ { + cdat4[i] = cdat0[i] - pdat[i] + sum += abs8(cdat4[i]) + } + for i := bpp; i < n; i++ { + cdat4[i] = cdat0[i] - paeth(cdat0[i-bpp], pdat[i], pdat[i-bpp]) + sum += abs8(cdat4[i]) + if sum >= best { + break + } + } + if sum < best { + best = sum + filter = ftPaeth + } + + // The none filter. + sum = 0 + for i := 0; i < n; i++ { + sum += abs8(cdat0[i]) + if sum >= best { + break + } + } + if sum < best { + best = sum + filter = ftNone + } + + // The sub filter. + sum = 0 + for i := 0; i < bpp; i++ { + cdat1[i] = cdat0[i] + sum += abs8(cdat1[i]) + } + for i := bpp; i < n; i++ { + cdat1[i] = cdat0[i] - cdat0[i-bpp] + sum += abs8(cdat1[i]) + if sum >= best { + break + } + } + if sum < best { + best = sum + filter = ftSub + } + + // The average filter. + sum = 0 + for i := 0; i < bpp; i++ { + cdat3[i] = cdat0[i] - pdat[i]/2 + sum += abs8(cdat3[i]) + } + for i := bpp; i < n; i++ { + cdat3[i] = cdat0[i] - uint8((int(cdat0[i-bpp])+int(pdat[i]))/2) + sum += abs8(cdat3[i]) + if sum >= best { + break + } + } + if sum < best { + filter = ftAverage + } + + return filter +} + +func zeroMemory(v []uint8) { + for i := range v { + v[i] = 0 + } +} + +func (e *encoder) writeImage(w io.Writer, m image.Image, cb int, level int) error { + if e.zw == nil || e.zwLevel != level { + zw, err := zlib.NewWriterLevel(w, level) + if err != nil { + return err + } + e.zw = zw + e.zwLevel = level + } else { + e.zw.Reset(w) + } + defer e.zw.Close() + + bitsPerPixel := 0 + + switch cb { + case cbG8: + bitsPerPixel = 8 + case cbTC8: + bitsPerPixel = 24 + case cbP8: + bitsPerPixel = 8 + case cbP4: + bitsPerPixel = 4 + case cbP2: + bitsPerPixel = 2 + case cbP1: + bitsPerPixel = 1 + case cbTCA8: + bitsPerPixel = 32 + case cbTC16: + bitsPerPixel = 48 + case cbTCA16: + bitsPerPixel = 64 + case cbG16: + bitsPerPixel = 16 + } + + // cr[*] and pr are the bytes for the current and previous row. + // cr[0] is unfiltered (or equivalently, filtered with the ftNone filter). + // cr[ft], for non-zero filter types ft, are buffers for transforming cr[0] under the + // other PNG filter types. These buffers are allocated once and re-used for each row. + // The +1 is for the per-row filter type, which is at cr[*][0]. + b := m.Bounds() + sz := 1 + (bitsPerPixel*b.Dx()+7)/8 + for i := range e.cr { + if cap(e.cr[i]) < sz { + e.cr[i] = make([]uint8, sz) + } else { + e.cr[i] = e.cr[i][:sz] + } + e.cr[i][0] = uint8(i) + } + cr := e.cr + if cap(e.pr) < sz { + e.pr = make([]uint8, sz) + } else { + e.pr = e.pr[:sz] + zeroMemory(e.pr) + } + pr := e.pr + + gray, _ := m.(*image.Gray) + rgba, _ := m.(*image.RGBA) + paletted, _ := m.(*image.Paletted) + nrgba, _ := m.(*image.NRGBA) + + for y := b.Min.Y; y < b.Max.Y; y++ { + // Convert from colors to bytes. + i := 1 + switch cb { + case cbG8: + if gray != nil { + offset := (y - b.Min.Y) * gray.Stride + copy(cr[0][1:], gray.Pix[offset:offset+b.Dx()]) + } else { + for x := b.Min.X; x < b.Max.X; x++ { + c := color.GrayModel.Convert(m.At(x, y)).(color.Gray) + cr[0][i] = c.Y + i++ + } + } + case cbTC8: + // We have previously verified that the alpha value is fully opaque. + cr0 := cr[0] + stride, pix := 0, []byte(nil) + if rgba != nil { + stride, pix = rgba.Stride, rgba.Pix + } else if nrgba != nil { + stride, pix = nrgba.Stride, nrgba.Pix + } + if stride != 0 { + j0 := (y - b.Min.Y) * stride + j1 := j0 + b.Dx()*4 + for j := j0; j < j1; j += 4 { + cr0[i+0] = pix[j+0] + cr0[i+1] = pix[j+1] + cr0[i+2] = pix[j+2] + i += 3 + } + } else { + for x := b.Min.X; x < b.Max.X; x++ { + r, g, b, _ := m.At(x, y).RGBA() + cr0[i+0] = uint8(r >> 8) + cr0[i+1] = uint8(g >> 8) + cr0[i+2] = uint8(b >> 8) + i += 3 + } + } + case cbP8: + if paletted != nil { + offset := (y - b.Min.Y) * paletted.Stride + copy(cr[0][1:], paletted.Pix[offset:offset+b.Dx()]) + } else { + pi := m.(image.PalettedImage) + for x := b.Min.X; x < b.Max.X; x++ { + cr[0][i] = pi.ColorIndexAt(x, y) + i += 1 + } + } + + case cbP4, cbP2, cbP1: + pi := m.(image.PalettedImage) + + var a uint8 + var c int + pixelsPerByte := 8 / bitsPerPixel + for x := b.Min.X; x < b.Max.X; x++ { + a = a<<uint(bitsPerPixel) | pi.ColorIndexAt(x, y) + c++ + if c == pixelsPerByte { + cr[0][i] = a + i += 1 + a = 0 + c = 0 + } + } + if c != 0 { + for c != pixelsPerByte { + a = a << uint(bitsPerPixel) + c++ + } + cr[0][i] = a + } + + case cbTCA8: + if nrgba != nil { + offset := (y - b.Min.Y) * nrgba.Stride + copy(cr[0][1:], nrgba.Pix[offset:offset+b.Dx()*4]) + } else { + // Convert from image.Image (which is alpha-premultiplied) to PNG's non-alpha-premultiplied. + for x := b.Min.X; x < b.Max.X; x++ { + c := color.NRGBAModel.Convert(m.At(x, y)).(color.NRGBA) + cr[0][i+0] = c.R + cr[0][i+1] = c.G + cr[0][i+2] = c.B + cr[0][i+3] = c.A + i += 4 + } + } + case cbG16: + for x := b.Min.X; x < b.Max.X; x++ { + c := color.Gray16Model.Convert(m.At(x, y)).(color.Gray16) + cr[0][i+0] = uint8(c.Y >> 8) + cr[0][i+1] = uint8(c.Y) + i += 2 + } + case cbTC16: + // We have previously verified that the alpha value is fully opaque. + for x := b.Min.X; x < b.Max.X; x++ { + r, g, b, _ := m.At(x, y).RGBA() + cr[0][i+0] = uint8(r >> 8) + cr[0][i+1] = uint8(r) + cr[0][i+2] = uint8(g >> 8) + cr[0][i+3] = uint8(g) + cr[0][i+4] = uint8(b >> 8) + cr[0][i+5] = uint8(b) + i += 6 + } + case cbTCA16: + // Convert from image.Image (which is alpha-premultiplied) to PNG's non-alpha-premultiplied. + for x := b.Min.X; x < b.Max.X; x++ { + c := color.NRGBA64Model.Convert(m.At(x, y)).(color.NRGBA64) + cr[0][i+0] = uint8(c.R >> 8) + cr[0][i+1] = uint8(c.R) + cr[0][i+2] = uint8(c.G >> 8) + cr[0][i+3] = uint8(c.G) + cr[0][i+4] = uint8(c.B >> 8) + cr[0][i+5] = uint8(c.B) + cr[0][i+6] = uint8(c.A >> 8) + cr[0][i+7] = uint8(c.A) + i += 8 + } + } + + // Apply the filter. + // Skip filter for NoCompression and paletted images (cbP8) as + // "filters are rarely useful on palette images" and will result + // in larger files (see http://www.libpng.org/pub/png/book/chapter09.html). + f := ftNone + if level != zlib.NoCompression && cb != cbP8 && cb != cbP4 && cb != cbP2 && cb != cbP1 { + // Since we skip paletted images we don't have to worry about + // bitsPerPixel not being a multiple of 8 + bpp := bitsPerPixel / 8 + f = filter(&cr, pr, bpp) + } + + // Write the compressed bytes. + if _, err := e.zw.Write(cr[f]); err != nil { + return err + } + + // The current row for y is the previous row for y+1. + pr, cr[0] = cr[0], pr + } + return nil +} + +// Write the actual image data to one or more IDAT chunks. +func (e *encoder) writeIDATs() { + if e.err != nil { + return + } + if e.bw == nil { + e.bw = bufio.NewWriterSize(e, 1<<15) + } else { + e.bw.Reset(e) + } + e.err = e.writeImage(e.bw, e.m, e.cb, levelToZlib(e.enc.CompressionLevel)) + if e.err != nil { + return + } + e.err = e.bw.Flush() +} + +// This function is required because we want the zero value of +// Encoder.CompressionLevel to map to zlib.DefaultCompression. +func levelToZlib(l CompressionLevel) int { + switch l { + case DefaultCompression: + return zlib.DefaultCompression + case NoCompression: + return zlib.NoCompression + case BestSpeed: + return zlib.BestSpeed + case BestCompression: + return zlib.BestCompression + default: + return zlib.DefaultCompression + } +} + +func (e *encoder) writeIEND() { e.writeChunk(nil, "IEND") } + +// Encode writes the Image m to w in PNG format. Any Image may be +// encoded, but images that are not image.NRGBA might be encoded lossily. +func Encode(w io.Writer, m image.Image) error { + var e Encoder + return e.Encode(w, m) +} + +// Encode writes the Image m to w in PNG format. +func (enc *Encoder) Encode(w io.Writer, m image.Image) error { + // Obviously, negative widths and heights are invalid. Furthermore, the PNG + // spec section 11.2.2 says that zero is invalid. Excessively large images are + // also rejected. + mw, mh := int64(m.Bounds().Dx()), int64(m.Bounds().Dy()) + if mw <= 0 || mh <= 0 || mw >= 1<<32 || mh >= 1<<32 { + return FormatError("invalid image size: " + strconv.FormatInt(mw, 10) + "x" + strconv.FormatInt(mh, 10)) + } + + var e *encoder + if enc.BufferPool != nil { + buffer := enc.BufferPool.Get() + e = (*encoder)(buffer) + + } + if e == nil { + e = &encoder{} + } + if enc.BufferPool != nil { + defer enc.BufferPool.Put((*EncoderBuffer)(e)) + } + + e.enc = enc + e.w = w + e.m = m + + var pal color.Palette + // cbP8 encoding needs PalettedImage's ColorIndexAt method. + if _, ok := m.(image.PalettedImage); ok { + pal, _ = m.ColorModel().(color.Palette) + } + if pal != nil { + if len(pal) <= 2 { + e.cb = cbP1 + } else if len(pal) <= 4 { + e.cb = cbP2 + } else if len(pal) <= 16 { + e.cb = cbP4 + } else { + e.cb = cbP8 + } + } else { + switch m.ColorModel() { + case color.GrayModel: + e.cb = cbG8 + case color.Gray16Model: + e.cb = cbG16 + case color.RGBAModel, color.NRGBAModel, color.AlphaModel: + if opaque(m) { + e.cb = cbTC8 + } else { + e.cb = cbTCA8 + } + default: + if opaque(m) { + e.cb = cbTC16 + } else { + e.cb = cbTCA16 + } + } + } + + _, e.err = io.WriteString(w, pngHeader) + e.writeIHDR() + if pal != nil { + e.writePLTEAndTRNS(pal) + } + e.writeIDATs() + e.writeIEND() + return e.err +} diff --git a/src/image/png/writer_test.go b/src/image/png/writer_test.go new file mode 100644 index 0000000..47aa861 --- /dev/null +++ b/src/image/png/writer_test.go @@ -0,0 +1,342 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package png + +import ( + "bytes" + "compress/zlib" + "encoding/binary" + "fmt" + "image" + "image/color" + "io" + "testing" +) + +func diff(m0, m1 image.Image) error { + b0, b1 := m0.Bounds(), m1.Bounds() + if !b0.Size().Eq(b1.Size()) { + return fmt.Errorf("dimensions differ: %v vs %v", b0, b1) + } + dx := b1.Min.X - b0.Min.X + dy := b1.Min.Y - b0.Min.Y + for y := b0.Min.Y; y < b0.Max.Y; y++ { + for x := b0.Min.X; x < b0.Max.X; x++ { + c0 := m0.At(x, y) + c1 := m1.At(x+dx, y+dy) + r0, g0, b0, a0 := c0.RGBA() + r1, g1, b1, a1 := c1.RGBA() + if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 { + return fmt.Errorf("colors differ at (%d, %d): %v vs %v", x, y, c0, c1) + } + } + } + return nil +} + +func encodeDecode(m image.Image) (image.Image, error) { + var b bytes.Buffer + err := Encode(&b, m) + if err != nil { + return nil, err + } + return Decode(&b) +} + +func TestWriter(t *testing.T) { + // The filenames variable is declared in reader_test.go. + names := filenames + if testing.Short() { + names = filenamesShort + } + for _, fn := range names { + qfn := "testdata/pngsuite/" + fn + ".png" + // Read the image. + m0, err := readPNG(qfn) + if err != nil { + t.Error(fn, err) + continue + } + // Read the image again, encode it, and decode it. + m1, err := readPNG(qfn) + if err != nil { + t.Error(fn, err) + continue + } + m2, err := encodeDecode(m1) + if err != nil { + t.Error(fn, err) + continue + } + // Compare the two. + err = diff(m0, m2) + if err != nil { + t.Error(fn, err) + continue + } + } +} + +func TestWriterPaletted(t *testing.T) { + const width, height = 32, 16 + + testCases := []struct { + plen int + bitdepth uint8 + datalen int + }{ + + { + plen: 256, + bitdepth: 8, + datalen: (1 + width) * height, + }, + + { + plen: 128, + bitdepth: 8, + datalen: (1 + width) * height, + }, + + { + plen: 16, + bitdepth: 4, + datalen: (1 + width/2) * height, + }, + + { + plen: 4, + bitdepth: 2, + datalen: (1 + width/4) * height, + }, + + { + plen: 2, + bitdepth: 1, + datalen: (1 + width/8) * height, + }, + } + + for _, tc := range testCases { + t.Run(fmt.Sprintf("plen-%d", tc.plen), func(t *testing.T) { + // Create a paletted image with the correct palette length + palette := make(color.Palette, tc.plen) + for i := range palette { + palette[i] = color.NRGBA{ + R: uint8(i), + G: uint8(i), + B: uint8(i), + A: 255, + } + } + m0 := image.NewPaletted(image.Rect(0, 0, width, height), palette) + + i := 0 + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + m0.SetColorIndex(x, y, uint8(i%tc.plen)) + i++ + } + } + + // Encode the image + var b bytes.Buffer + if err := Encode(&b, m0); err != nil { + t.Error(err) + return + } + const chunkFieldsLength = 12 // 4 bytes for length, name and crc + data := b.Bytes() + i = len(pngHeader) + + for i < len(data)-chunkFieldsLength { + length := binary.BigEndian.Uint32(data[i : i+4]) + name := string(data[i+4 : i+8]) + + switch name { + case "IHDR": + bitdepth := data[i+8+8] + if bitdepth != tc.bitdepth { + t.Errorf("got bitdepth %d, want %d", bitdepth, tc.bitdepth) + } + case "IDAT": + // Uncompress the image data + r, err := zlib.NewReader(bytes.NewReader(data[i+8 : i+8+int(length)])) + if err != nil { + t.Error(err) + return + } + n, err := io.Copy(io.Discard, r) + if err != nil { + t.Errorf("got error while reading image data: %v", err) + } + if n != int64(tc.datalen) { + t.Errorf("got uncompressed data length %d, want %d", n, tc.datalen) + } + } + + i += chunkFieldsLength + int(length) + } + }) + + } +} + +func TestWriterLevels(t *testing.T) { + m := image.NewNRGBA(image.Rect(0, 0, 100, 100)) + + var b1, b2 bytes.Buffer + if err := (&Encoder{}).Encode(&b1, m); err != nil { + t.Fatal(err) + } + noenc := &Encoder{CompressionLevel: NoCompression} + if err := noenc.Encode(&b2, m); err != nil { + t.Fatal(err) + } + + if b2.Len() <= b1.Len() { + t.Error("DefaultCompression encoding was larger than NoCompression encoding") + } + if _, err := Decode(&b1); err != nil { + t.Error("cannot decode DefaultCompression") + } + if _, err := Decode(&b2); err != nil { + t.Error("cannot decode NoCompression") + } +} + +func TestSubImage(t *testing.T) { + m0 := image.NewRGBA(image.Rect(0, 0, 256, 256)) + for y := 0; y < 256; y++ { + for x := 0; x < 256; x++ { + m0.Set(x, y, color.RGBA{uint8(x), uint8(y), 0, 255}) + } + } + m0 = m0.SubImage(image.Rect(50, 30, 250, 130)).(*image.RGBA) + m1, err := encodeDecode(m0) + if err != nil { + t.Error(err) + return + } + err = diff(m0, m1) + if err != nil { + t.Error(err) + return + } +} + +func BenchmarkEncodeGray(b *testing.B) { + img := image.NewGray(image.Rect(0, 0, 640, 480)) + b.SetBytes(640 * 480 * 1) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} + +type pool struct { + b *EncoderBuffer +} + +func (p *pool) Get() *EncoderBuffer { + return p.b +} + +func (p *pool) Put(b *EncoderBuffer) { + p.b = b +} + +func BenchmarkEncodeGrayWithBufferPool(b *testing.B) { + img := image.NewGray(image.Rect(0, 0, 640, 480)) + e := Encoder{ + BufferPool: &pool{}, + } + b.SetBytes(640 * 480 * 1) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + e.Encode(io.Discard, img) + } +} + +func BenchmarkEncodeNRGBOpaque(b *testing.B) { + img := image.NewNRGBA(image.Rect(0, 0, 640, 480)) + // Set all pixels to 0xFF alpha to force opaque mode. + bo := img.Bounds() + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + img.Set(x, y, color.NRGBA{0, 0, 0, 255}) + } + } + if !img.Opaque() { + b.Fatal("expected image to be opaque") + } + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} + +func BenchmarkEncodeNRGBA(b *testing.B) { + img := image.NewNRGBA(image.Rect(0, 0, 640, 480)) + if img.Opaque() { + b.Fatal("expected image not to be opaque") + } + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} + +func BenchmarkEncodePaletted(b *testing.B) { + img := image.NewPaletted(image.Rect(0, 0, 640, 480), color.Palette{ + color.RGBA{0, 0, 0, 255}, + color.RGBA{255, 255, 255, 255}, + }) + b.SetBytes(640 * 480 * 1) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} + +func BenchmarkEncodeRGBOpaque(b *testing.B) { + img := image.NewRGBA(image.Rect(0, 0, 640, 480)) + // Set all pixels to 0xFF alpha to force opaque mode. + bo := img.Bounds() + for y := bo.Min.Y; y < bo.Max.Y; y++ { + for x := bo.Min.X; x < bo.Max.X; x++ { + img.Set(x, y, color.RGBA{0, 0, 0, 255}) + } + } + if !img.Opaque() { + b.Fatal("expected image to be opaque") + } + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} + +func BenchmarkEncodeRGBA(b *testing.B) { + img := image.NewRGBA(image.Rect(0, 0, 640, 480)) + if img.Opaque() { + b.Fatal("expected image not to be opaque") + } + b.SetBytes(640 * 480 * 4) + b.ReportAllocs() + b.ResetTimer() + for i := 0; i < b.N; i++ { + Encode(io.Discard, img) + } +} diff --git a/src/image/testdata/triangle-001.gif b/src/image/testdata/triangle-001.gif Binary files differnew file mode 100644 index 0000000..f3d45bb --- /dev/null +++ b/src/image/testdata/triangle-001.gif diff --git a/src/image/testdata/video-001.221212.jpeg b/src/image/testdata/video-001.221212.jpeg Binary files differnew file mode 100644 index 0000000..f069c76 --- /dev/null +++ b/src/image/testdata/video-001.221212.jpeg diff --git a/src/image/testdata/video-001.221212.png b/src/image/testdata/video-001.221212.png Binary files differnew file mode 100644 index 0000000..d619a62 --- /dev/null +++ b/src/image/testdata/video-001.221212.png diff --git a/src/image/testdata/video-001.5bpp.gif b/src/image/testdata/video-001.5bpp.gif Binary files differnew file 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All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "image/color" +) + +// YCbCrSubsampleRatio is the chroma subsample ratio used in a YCbCr image. +type YCbCrSubsampleRatio int + +const ( + YCbCrSubsampleRatio444 YCbCrSubsampleRatio = iota + YCbCrSubsampleRatio422 + YCbCrSubsampleRatio420 + YCbCrSubsampleRatio440 + YCbCrSubsampleRatio411 + YCbCrSubsampleRatio410 +) + +func (s YCbCrSubsampleRatio) String() string { + switch s { + case YCbCrSubsampleRatio444: + return "YCbCrSubsampleRatio444" + case YCbCrSubsampleRatio422: + return "YCbCrSubsampleRatio422" + case YCbCrSubsampleRatio420: + return "YCbCrSubsampleRatio420" + case YCbCrSubsampleRatio440: + return "YCbCrSubsampleRatio440" + case YCbCrSubsampleRatio411: + return "YCbCrSubsampleRatio411" + case YCbCrSubsampleRatio410: + return "YCbCrSubsampleRatio410" + } + return "YCbCrSubsampleRatioUnknown" +} + +// YCbCr is an in-memory image of Y'CbCr colors. There is one Y sample per +// pixel, but each Cb and Cr sample can span one or more pixels. +// YStride is the Y slice index delta between vertically adjacent pixels. +// CStride is the Cb and Cr slice index delta between vertically adjacent pixels +// that map to separate chroma samples. +// It is not an absolute requirement, but YStride and len(Y) are typically +// multiples of 8, and: +// For 4:4:4, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/1. +// For 4:2:2, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/2. +// For 4:2:0, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/4. +// For 4:4:0, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/2. +// For 4:1:1, CStride == YStride/4 && len(Cb) == len(Cr) == len(Y)/4. +// For 4:1:0, CStride == YStride/4 && len(Cb) == len(Cr) == len(Y)/8. +type YCbCr struct { + Y, Cb, Cr []uint8 + YStride int + CStride int + SubsampleRatio YCbCrSubsampleRatio + Rect Rectangle +} + +func (p *YCbCr) ColorModel() color.Model { + return color.YCbCrModel +} + +func (p *YCbCr) Bounds() Rectangle { + return p.Rect +} + +func (p *YCbCr) At(x, y int) color.Color { + return p.YCbCrAt(x, y) +} + +func (p *YCbCr) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := p.YCbCrAt(x, y).RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func (p *YCbCr) YCbCrAt(x, y int) color.YCbCr { + if !(Point{x, y}.In(p.Rect)) { + return color.YCbCr{} + } + yi := p.YOffset(x, y) + ci := p.COffset(x, y) + return color.YCbCr{ + p.Y[yi], + p.Cb[ci], + p.Cr[ci], + } +} + +// YOffset returns the index of the first element of Y that corresponds to +// the pixel at (x, y). +func (p *YCbCr) YOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.YStride + (x - p.Rect.Min.X) +} + +// COffset returns the index of the first element of Cb or Cr that corresponds +// to the pixel at (x, y). +func (p *YCbCr) COffset(x, y int) int { + switch p.SubsampleRatio { + case YCbCrSubsampleRatio422: + return (y-p.Rect.Min.Y)*p.CStride + (x/2 - p.Rect.Min.X/2) + case YCbCrSubsampleRatio420: + return (y/2-p.Rect.Min.Y/2)*p.CStride + (x/2 - p.Rect.Min.X/2) + case YCbCrSubsampleRatio440: + return (y/2-p.Rect.Min.Y/2)*p.CStride + (x - p.Rect.Min.X) + case YCbCrSubsampleRatio411: + return (y-p.Rect.Min.Y)*p.CStride + (x/4 - p.Rect.Min.X/4) + case YCbCrSubsampleRatio410: + return (y/2-p.Rect.Min.Y/2)*p.CStride + (x/4 - p.Rect.Min.X/4) + } + // Default to 4:4:4 subsampling. + return (y-p.Rect.Min.Y)*p.CStride + (x - p.Rect.Min.X) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *YCbCr) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &YCbCr{ + SubsampleRatio: p.SubsampleRatio, + } + } + yi := p.YOffset(r.Min.X, r.Min.Y) + ci := p.COffset(r.Min.X, r.Min.Y) + return &YCbCr{ + Y: p.Y[yi:], + Cb: p.Cb[ci:], + Cr: p.Cr[ci:], + SubsampleRatio: p.SubsampleRatio, + YStride: p.YStride, + CStride: p.CStride, + Rect: r, + } +} + +func (p *YCbCr) Opaque() bool { + return true +} + +func yCbCrSize(r Rectangle, subsampleRatio YCbCrSubsampleRatio) (w, h, cw, ch int) { + w, h = r.Dx(), r.Dy() + switch subsampleRatio { + case YCbCrSubsampleRatio422: + cw = (r.Max.X+1)/2 - r.Min.X/2 + ch = h + case YCbCrSubsampleRatio420: + cw = (r.Max.X+1)/2 - r.Min.X/2 + ch = (r.Max.Y+1)/2 - r.Min.Y/2 + case YCbCrSubsampleRatio440: + cw = w + ch = (r.Max.Y+1)/2 - r.Min.Y/2 + case YCbCrSubsampleRatio411: + cw = (r.Max.X+3)/4 - r.Min.X/4 + ch = h + case YCbCrSubsampleRatio410: + cw = (r.Max.X+3)/4 - r.Min.X/4 + ch = (r.Max.Y+1)/2 - r.Min.Y/2 + default: + // Default to 4:4:4 subsampling. + cw = w + ch = h + } + return +} + +// NewYCbCr returns a new YCbCr image with the given bounds and subsample +// ratio. +func NewYCbCr(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *YCbCr { + w, h, cw, ch := yCbCrSize(r, subsampleRatio) + + // totalLength should be the same as i2, below, for a valid Rectangle r. + totalLength := add2NonNeg( + mul3NonNeg(1, w, h), + mul3NonNeg(2, cw, ch), + ) + if totalLength < 0 { + panic("image: NewYCbCr Rectangle has huge or negative dimensions") + } + + i0 := w*h + 0*cw*ch + i1 := w*h + 1*cw*ch + i2 := w*h + 2*cw*ch + b := make([]byte, i2) + return &YCbCr{ + Y: b[:i0:i0], + Cb: b[i0:i1:i1], + Cr: b[i1:i2:i2], + SubsampleRatio: subsampleRatio, + YStride: w, + CStride: cw, + Rect: r, + } +} + +// NYCbCrA is an in-memory image of non-alpha-premultiplied Y'CbCr-with-alpha +// colors. A and AStride are analogous to the Y and YStride fields of the +// embedded YCbCr. +type NYCbCrA struct { + YCbCr + A []uint8 + AStride int +} + +func (p *NYCbCrA) ColorModel() color.Model { + return color.NYCbCrAModel +} + +func (p *NYCbCrA) At(x, y int) color.Color { + return p.NYCbCrAAt(x, y) +} + +func (p *NYCbCrA) RGBA64At(x, y int) color.RGBA64 { + r, g, b, a := p.NYCbCrAAt(x, y).RGBA() + return color.RGBA64{uint16(r), uint16(g), uint16(b), uint16(a)} +} + +func (p *NYCbCrA) NYCbCrAAt(x, y int) color.NYCbCrA { + if !(Point{X: x, Y: y}.In(p.Rect)) { + return color.NYCbCrA{} + } + yi := p.YOffset(x, y) + ci := p.COffset(x, y) + ai := p.AOffset(x, y) + return color.NYCbCrA{ + color.YCbCr{ + Y: p.Y[yi], + Cb: p.Cb[ci], + Cr: p.Cr[ci], + }, + p.A[ai], + } +} + +// AOffset returns the index of the first element of A that corresponds to the +// pixel at (x, y). +func (p *NYCbCrA) AOffset(x, y int) int { + return (y-p.Rect.Min.Y)*p.AStride + (x - p.Rect.Min.X) +} + +// SubImage returns an image representing the portion of the image p visible +// through r. The returned value shares pixels with the original image. +func (p *NYCbCrA) SubImage(r Rectangle) Image { + r = r.Intersect(p.Rect) + // If r1 and r2 are Rectangles, r1.Intersect(r2) is not guaranteed to be inside + // either r1 or r2 if the intersection is empty. Without explicitly checking for + // this, the Pix[i:] expression below can panic. + if r.Empty() { + return &NYCbCrA{ + YCbCr: YCbCr{ + SubsampleRatio: p.SubsampleRatio, + }, + } + } + yi := p.YOffset(r.Min.X, r.Min.Y) + ci := p.COffset(r.Min.X, r.Min.Y) + ai := p.AOffset(r.Min.X, r.Min.Y) + return &NYCbCrA{ + YCbCr: YCbCr{ + Y: p.Y[yi:], + Cb: p.Cb[ci:], + Cr: p.Cr[ci:], + SubsampleRatio: p.SubsampleRatio, + YStride: p.YStride, + CStride: p.CStride, + Rect: r, + }, + A: p.A[ai:], + AStride: p.AStride, + } +} + +// Opaque scans the entire image and reports whether it is fully opaque. +func (p *NYCbCrA) Opaque() bool { + if p.Rect.Empty() { + return true + } + i0, i1 := 0, p.Rect.Dx() + for y := p.Rect.Min.Y; y < p.Rect.Max.Y; y++ { + for _, a := range p.A[i0:i1] { + if a != 0xff { + return false + } + } + i0 += p.AStride + i1 += p.AStride + } + return true +} + +// NewNYCbCrA returns a new NYCbCrA image with the given bounds and subsample +// ratio. +func NewNYCbCrA(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *NYCbCrA { + w, h, cw, ch := yCbCrSize(r, subsampleRatio) + + // totalLength should be the same as i3, below, for a valid Rectangle r. + totalLength := add2NonNeg( + mul3NonNeg(2, w, h), + mul3NonNeg(2, cw, ch), + ) + if totalLength < 0 { + panic("image: NewNYCbCrA Rectangle has huge or negative dimension") + } + + i0 := 1*w*h + 0*cw*ch + i1 := 1*w*h + 1*cw*ch + i2 := 1*w*h + 2*cw*ch + i3 := 2*w*h + 2*cw*ch + b := make([]byte, i3) + return &NYCbCrA{ + YCbCr: YCbCr{ + Y: b[:i0:i0], + Cb: b[i0:i1:i1], + Cr: b[i1:i2:i2], + SubsampleRatio: subsampleRatio, + YStride: w, + CStride: cw, + Rect: r, + }, + A: b[i2:], + AStride: w, + } +} diff --git a/src/image/ycbcr_test.go b/src/image/ycbcr_test.go new file mode 100644 index 0000000..4996bc8 --- /dev/null +++ b/src/image/ycbcr_test.go @@ -0,0 +1,133 @@ +// Copyright 2012 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package image + +import ( + "image/color" + "testing" +) + +func TestYCbCr(t *testing.T) { + rects := []Rectangle{ + Rect(0, 0, 16, 16), + Rect(1, 0, 16, 16), + Rect(0, 1, 16, 16), + Rect(1, 1, 16, 16), + Rect(1, 1, 15, 16), + Rect(1, 1, 16, 15), + Rect(1, 1, 15, 15), + Rect(2, 3, 14, 15), + Rect(7, 0, 7, 16), + Rect(0, 8, 16, 8), + Rect(0, 0, 10, 11), + Rect(5, 6, 16, 16), + Rect(7, 7, 8, 8), + Rect(7, 8, 8, 9), + Rect(8, 7, 9, 8), + Rect(8, 8, 9, 9), + Rect(7, 7, 17, 17), + Rect(8, 8, 17, 17), + Rect(9, 9, 17, 17), + Rect(10, 10, 17, 17), + } + subsampleRatios := []YCbCrSubsampleRatio{ + YCbCrSubsampleRatio444, + YCbCrSubsampleRatio422, + YCbCrSubsampleRatio420, + YCbCrSubsampleRatio440, + YCbCrSubsampleRatio411, + YCbCrSubsampleRatio410, + } + deltas := []Point{ + Pt(0, 0), + Pt(1000, 1001), + Pt(5001, -400), + Pt(-701, -801), + } + for _, r := range rects { + for _, subsampleRatio := range subsampleRatios { + for _, delta := range deltas { + testYCbCr(t, r, subsampleRatio, delta) + } + } + if testing.Short() { + break + } + } +} + +func testYCbCr(t *testing.T, r Rectangle, subsampleRatio YCbCrSubsampleRatio, delta Point) { + // Create a YCbCr image m, whose bounds are r translated by (delta.X, delta.Y). + r1 := r.Add(delta) + m := NewYCbCr(r1, subsampleRatio) + + // Test that the image buffer is reasonably small even if (delta.X, delta.Y) is far from the origin. + if len(m.Y) > 100*100 { + t.Errorf("r=%v, subsampleRatio=%v, delta=%v: image buffer is too large", + r, subsampleRatio, delta) + return + } + + // Initialize m's pixels. For 422 and 420 subsampling, some of the Cb and Cr elements + // will be set multiple times. That's OK. We just want to avoid a uniform image. + for y := r1.Min.Y; y < r1.Max.Y; y++ { + for x := r1.Min.X; x < r1.Max.X; x++ { + yi := m.YOffset(x, y) + ci := m.COffset(x, y) + m.Y[yi] = uint8(16*y + x) + m.Cb[ci] = uint8(y + 16*x) + m.Cr[ci] = uint8(y + 16*x) + } + } + + // Make various sub-images of m. + for y0 := delta.Y + 3; y0 < delta.Y+7; y0++ { + for y1 := delta.Y + 8; y1 < delta.Y+13; y1++ { + for x0 := delta.X + 3; x0 < delta.X+7; x0++ { + for x1 := delta.X + 8; x1 < delta.X+13; x1++ { + subRect := Rect(x0, y0, x1, y1) + sub := m.SubImage(subRect).(*YCbCr) + + // For each point in the sub-image's bounds, check that m.At(x, y) equals sub.At(x, y). + for y := sub.Rect.Min.Y; y < sub.Rect.Max.Y; y++ { + for x := sub.Rect.Min.X; x < sub.Rect.Max.X; x++ { + color0 := m.At(x, y).(color.YCbCr) + color1 := sub.At(x, y).(color.YCbCr) + if color0 != color1 { + t.Errorf("r=%v, subsampleRatio=%v, delta=%v, x=%d, y=%d, color0=%v, color1=%v", + r, subsampleRatio, delta, x, y, color0, color1) + return + } + } + } + } + } + } + } +} + +func TestYCbCrSlicesDontOverlap(t *testing.T) { + m := NewYCbCr(Rect(0, 0, 8, 8), YCbCrSubsampleRatio420) + names := []string{"Y", "Cb", "Cr"} + slices := [][]byte{ + m.Y[:cap(m.Y)], + m.Cb[:cap(m.Cb)], + m.Cr[:cap(m.Cr)], + } + for i, slice := range slices { + want := uint8(10 + i) + for j := range slice { + slice[j] = want + } + } + for i, slice := range slices { + want := uint8(10 + i) + for j, got := range slice { + if got != want { + t.Fatalf("m.%s[%d]: got %d, want %d", names[i], j, got, want) + } + } + } +} |
