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-rw-r--r--src/image/image_test.go458
1 files changed, 458 insertions, 0 deletions
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)
+ }
+}
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