init

vendor/code.google.com/p/graphics-go/graphics/rotate_test.go

@@ -0,0 +1,169 @@
+// Copyright 2011 The Graphics-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 graphics
+
+import (
+	"code.google.com/p/graphics-go/graphics/graphicstest"
+	"image"
+	"math"
+	"testing"
+
+	_ "image/png"
+)
+
+var rotateOneColorTests = []transformOneColorTest{
+	{
+		"onepixel-onequarter", 1, 1, 1, 1,
+		&RotateOptions{math.Pi / 2},
+		[]uint8{0xff},
+		[]uint8{0xff},
+	},
+	{
+		"onepixel-partial", 1, 1, 1, 1,
+		&RotateOptions{math.Pi * 2.0 / 3.0},
+		[]uint8{0xff},
+		[]uint8{0xff},
+	},
+	{
+		"onepixel-complete", 1, 1, 1, 1,
+		&RotateOptions{2 * math.Pi},
+		[]uint8{0xff},
+		[]uint8{0xff},
+	},
+	{
+		"even-onequarter", 2, 2, 2, 2,
+		&RotateOptions{math.Pi / 2.0},
+		[]uint8{
+			0xff, 0x00,
+			0x00, 0xff,
+		},
+		[]uint8{
+			0x00, 0xff,
+			0xff, 0x00,
+		},
+	},
+	{
+		"even-complete", 2, 2, 2, 2,
+		&RotateOptions{2.0 * math.Pi},
+		[]uint8{
+			0xff, 0x00,
+			0x00, 0xff,
+		},
+		[]uint8{
+			0xff, 0x00,
+			0x00, 0xff,
+		},
+	},
+	{
+		"line-partial", 3, 3, 3, 3,
+		&RotateOptions{math.Pi * 1.0 / 3.0},
+		[]uint8{
+			0x00, 0x00, 0x00,
+			0xff, 0xff, 0xff,
+			0x00, 0x00, 0x00,
+		},
+		[]uint8{
+			0xa2, 0x80, 0x00,
+			0x22, 0xff, 0x22,
+			0x00, 0x80, 0xa2,
+		},
+	},
+	{
+		"line-offset-partial", 3, 3, 3, 3,
+		&RotateOptions{math.Pi * 3 / 2},
+		[]uint8{
+			0x00, 0x00, 0x00,
+			0x00, 0xff, 0xff,
+			0x00, 0x00, 0x00,
+		},
+		[]uint8{
+			0x00, 0xff, 0x00,
+			0x00, 0xff, 0x00,
+			0x00, 0x00, 0x00,
+		},
+	},
+	{
+		"dot-partial", 4, 4, 4, 4,
+		&RotateOptions{math.Pi},
+		[]uint8{
+			0x00, 0x00, 0x00, 0x00,
+			0x00, 0xff, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x00,
+		},
+		[]uint8{
+			0x00, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0xff, 0x00,
+			0x00, 0x00, 0x00, 0x00,
+		},
+	},
+}
+
+func TestRotateOneColor(t *testing.T) {
+	for _, oc := range rotateOneColorTests {
+		src := oc.newSrc()
+		dst := oc.newDst()
+
+		if err := Rotate(dst, src, oc.opt.(*RotateOptions)); err != nil {
+			t.Errorf("rotate %s: %v", oc.desc, err)
+			continue
+		}
+		if !checkTransformTest(t, &oc, dst) {
+			continue
+		}
+	}
+}
+
+func TestRotateEmpty(t *testing.T) {
+	empty := image.NewRGBA(image.Rect(0, 0, 0, 0))
+	if err := Rotate(empty, empty, nil); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRotateGopherSide(t *testing.T) {
+	src, err := graphicstest.LoadImage("../testdata/gopher.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	srcb := src.Bounds()
+	dst := image.NewRGBA(image.Rect(0, 0, srcb.Dy(), srcb.Dx()))
+	if err := Rotate(dst, src, &RotateOptions{math.Pi / 2.0}); err != nil {
+		t.Fatal(err)
+	}
+
+	cmp, err := graphicstest.LoadImage("../testdata/gopher-rotate-side.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = graphicstest.ImageWithinTolerance(dst, cmp, 0x101)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRotateGopherPartial(t *testing.T) {
+	src, err := graphicstest.LoadImage("../testdata/gopher.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	srcb := src.Bounds()
+	dst := image.NewRGBA(image.Rect(0, 0, srcb.Dx(), srcb.Dy()))
+	if err := Rotate(dst, src, &RotateOptions{math.Pi / 3.0}); err != nil {
+		t.Fatal(err)
+	}
+
+	cmp, err := graphicstest.LoadImage("../testdata/gopher-rotate-partial.png")
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = graphicstest.ImageWithinTolerance(dst, cmp, 0x101)
+	if err != nil {
+		t.Fatal(err)
+	}
+}