Adding upstream version 1.18.10.upstream/1.18.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 205 insertions, 0 deletions

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)
+			}
+		}
+	}
+}