743 lines
24 KiB
Go
743 lines
24 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package draw
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import (
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"bytes"
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"flag"
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"fmt"
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"image"
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"image/color"
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"image/png"
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"math/rand"
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"os"
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"reflect"
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"testing"
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"golang.org/x/image/math/f64"
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_ "image/jpeg"
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)
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var genGoldenFiles = flag.Bool("gen_golden_files", false, "whether to generate the TestXxx golden files.")
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var transformMatrix = func(scale, tx, ty float64) f64.Aff3 {
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const cos30, sin30 = 0.866025404, 0.5
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return f64.Aff3{
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+scale * cos30, -scale * sin30, tx,
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+scale * sin30, +scale * cos30, ty,
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}
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}
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func encode(filename string, m image.Image) error {
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f, err := os.Create(filename)
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if err != nil {
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return fmt.Errorf("Create: %v", err)
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}
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defer f.Close()
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if err := png.Encode(f, m); err != nil {
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return fmt.Errorf("Encode: %v", err)
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}
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return nil
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}
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// testInterp tests that interpolating the source image gives the exact
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// destination image. This is to ensure that any refactoring or optimization of
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// the interpolation code doesn't change the behavior. Changing the actual
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// algorithm or kernel used by any particular quality setting will obviously
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// change the resultant pixels. In such a case, use the gen_golden_files flag
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// to regenerate the golden files.
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func testInterp(t *testing.T, w int, h int, direction, prefix, suffix string) {
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f, err := os.Open("../testdata/" + prefix + suffix)
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if err != nil {
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t.Fatalf("Open: %v", err)
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}
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defer f.Close()
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src, _, err := image.Decode(f)
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if err != nil {
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t.Fatalf("Decode: %v", err)
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}
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op, scale := Src, 3.75
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if prefix == "tux" {
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op, scale = Over, 0.125
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}
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green := image.NewUniform(color.RGBA{0x00, 0x22, 0x11, 0xff})
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testCases := map[string]Interpolator{
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"nn": NearestNeighbor,
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"ab": ApproxBiLinear,
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"bl": BiLinear,
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"cr": CatmullRom,
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}
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for name, q := range testCases {
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goldenFilename := fmt.Sprintf("../testdata/%s-%s-%s.png", prefix, direction, name)
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got := image.NewRGBA(image.Rect(0, 0, w, h))
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Copy(got, image.Point{}, green, got.Bounds(), Src, nil)
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if direction == "rotate" {
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q.Transform(got, transformMatrix(scale, 40, 10), src, src.Bounds(), op, nil)
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} else {
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q.Scale(got, got.Bounds(), src, src.Bounds(), op, nil)
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}
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if *genGoldenFiles {
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if err := encode(goldenFilename, got); err != nil {
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t.Error(err)
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}
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continue
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}
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g, err := os.Open(goldenFilename)
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if err != nil {
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t.Errorf("Open: %v", err)
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continue
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}
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defer g.Close()
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wantRaw, err := png.Decode(g)
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if err != nil {
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t.Errorf("Decode: %v", err)
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continue
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}
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// convert wantRaw to RGBA.
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want, ok := wantRaw.(*image.RGBA)
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if !ok {
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b := wantRaw.Bounds()
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want = image.NewRGBA(b)
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Draw(want, b, wantRaw, b.Min, Src)
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}
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if !reflect.DeepEqual(got, want) {
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t.Errorf("%s: actual image differs from golden image", goldenFilename)
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continue
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}
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}
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}
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func TestScaleDown(t *testing.T) { testInterp(t, 100, 100, "down", "go-turns-two", "-280x360.jpeg") }
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func TestScaleUp(t *testing.T) { testInterp(t, 75, 100, "up", "go-turns-two", "-14x18.png") }
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func TestTformSrc(t *testing.T) { testInterp(t, 100, 100, "rotate", "go-turns-two", "-14x18.png") }
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func TestTformOver(t *testing.T) { testInterp(t, 100, 100, "rotate", "tux", ".png") }
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// TestSimpleTransforms tests Scale and Transform calls that simplify to Copy
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// or Scale calls.
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func TestSimpleTransforms(t *testing.T) {
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f, err := os.Open("../testdata/testpattern.png") // A 100x100 image.
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if err != nil {
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t.Fatalf("Open: %v", err)
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}
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defer f.Close()
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src, _, err := image.Decode(f)
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if err != nil {
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t.Fatalf("Decode: %v", err)
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}
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dst0 := image.NewRGBA(image.Rect(0, 0, 120, 150))
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dst1 := image.NewRGBA(image.Rect(0, 0, 120, 150))
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for _, op := range []string{"scale/copy", "tform/copy", "tform/scale"} {
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for _, epsilon := range []float64{0, 1e-50, 1e-1} {
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Copy(dst0, image.Point{}, image.Transparent, dst0.Bounds(), Src, nil)
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Copy(dst1, image.Point{}, image.Transparent, dst1.Bounds(), Src, nil)
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switch op {
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case "scale/copy":
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dr := image.Rect(10, 30, 10+100, 30+100)
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if epsilon > 1e-10 {
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dr.Max.X++
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}
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Copy(dst0, image.Point{10, 30}, src, src.Bounds(), Src, nil)
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ApproxBiLinear.Scale(dst1, dr, src, src.Bounds(), Src, nil)
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case "tform/copy":
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Copy(dst0, image.Point{10, 30}, src, src.Bounds(), Src, nil)
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ApproxBiLinear.Transform(dst1, f64.Aff3{
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1, 0 + epsilon, 10,
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0, 1, 30,
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}, src, src.Bounds(), Src, nil)
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case "tform/scale":
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ApproxBiLinear.Scale(dst0, image.Rect(10, 50, 10+50, 50+50), src, src.Bounds(), Src, nil)
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ApproxBiLinear.Transform(dst1, f64.Aff3{
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0.5, 0.0 + epsilon, 10,
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0.0, 0.5, 50,
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}, src, src.Bounds(), Src, nil)
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}
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differ := !bytes.Equal(dst0.Pix, dst1.Pix)
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if epsilon > 1e-10 {
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if !differ {
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t.Errorf("%s yielded same pixels, want different pixels: epsilon=%v", op, epsilon)
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}
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} else {
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if differ {
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t.Errorf("%s yielded different pixels, want same pixels: epsilon=%v", op, epsilon)
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}
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}
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}
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}
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}
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func BenchmarkSimpleScaleCopy(b *testing.B) {
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dst := image.NewRGBA(image.Rect(0, 0, 640, 480))
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src := image.NewRGBA(image.Rect(0, 0, 400, 300))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ApproxBiLinear.Scale(dst, image.Rect(10, 20, 10+400, 20+300), src, src.Bounds(), Src, nil)
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}
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}
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func BenchmarkSimpleTransformCopy(b *testing.B) {
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dst := image.NewRGBA(image.Rect(0, 0, 640, 480))
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src := image.NewRGBA(image.Rect(0, 0, 400, 300))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ApproxBiLinear.Transform(dst, f64.Aff3{
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1, 0, 10,
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0, 1, 20,
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}, src, src.Bounds(), Src, nil)
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}
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}
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func BenchmarkSimpleTransformScale(b *testing.B) {
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dst := image.NewRGBA(image.Rect(0, 0, 640, 480))
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src := image.NewRGBA(image.Rect(0, 0, 400, 300))
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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ApproxBiLinear.Transform(dst, f64.Aff3{
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0.5, 0.0, 10,
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0.0, 0.5, 20,
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}, src, src.Bounds(), Src, nil)
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}
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}
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func TestOps(t *testing.T) {
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blue := image.NewUniform(color.RGBA{0x00, 0x00, 0xff, 0xff})
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testCases := map[Op]color.RGBA{
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Over: color.RGBA{0x7f, 0x00, 0x80, 0xff},
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Src: color.RGBA{0x7f, 0x00, 0x00, 0x7f},
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}
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for op, want := range testCases {
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dst := image.NewRGBA(image.Rect(0, 0, 2, 2))
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Copy(dst, image.Point{}, blue, dst.Bounds(), Src, nil)
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src := image.NewRGBA(image.Rect(0, 0, 1, 1))
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src.SetRGBA(0, 0, color.RGBA{0x7f, 0x00, 0x00, 0x7f})
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NearestNeighbor.Scale(dst, dst.Bounds(), src, src.Bounds(), op, nil)
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if got := dst.RGBAAt(0, 0); got != want {
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t.Errorf("op=%v: got %v, want %v", op, got, want)
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}
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}
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}
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// TestNegativeWeights tests that scaling by a kernel that produces negative
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// weights, such as the Catmull-Rom kernel, doesn't produce an invalid color
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// according to Go's alpha-premultiplied model.
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func TestNegativeWeights(t *testing.T) {
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check := func(m *image.RGBA) error {
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b := m.Bounds()
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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if c := m.RGBAAt(x, y); c.R > c.A || c.G > c.A || c.B > c.A {
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return fmt.Errorf("invalid color.RGBA at (%d, %d): %v", x, y, c)
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}
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}
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}
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return nil
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}
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src := image.NewRGBA(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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a := y * 0x11
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src.Set(x, y, color.RGBA{
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R: uint8(x * 0x11 * a / 0xff),
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A: uint8(a),
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})
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}
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}
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if err := check(src); err != nil {
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t.Fatalf("src image: %v", err)
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}
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dst := image.NewRGBA(image.Rect(0, 0, 32, 32))
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CatmullRom.Scale(dst, dst.Bounds(), src, src.Bounds(), Over, nil)
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if err := check(dst); err != nil {
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t.Fatalf("dst image: %v", err)
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}
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}
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func fillPix(r *rand.Rand, pixs ...[]byte) {
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for _, pix := range pixs {
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for i := range pix {
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pix[i] = uint8(r.Intn(256))
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}
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}
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}
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func TestInterpClipCommute(t *testing.T) {
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src := image.NewNRGBA(image.Rect(0, 0, 20, 20))
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fillPix(rand.New(rand.NewSource(0)), src.Pix)
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outer := image.Rect(1, 1, 8, 5)
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inner := image.Rect(2, 3, 6, 5)
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qs := []Interpolator{
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NearestNeighbor,
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ApproxBiLinear,
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CatmullRom,
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}
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for _, transform := range []bool{false, true} {
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for _, q := range qs {
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dst0 := image.NewRGBA(image.Rect(1, 1, 10, 10))
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dst1 := image.NewRGBA(image.Rect(1, 1, 10, 10))
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for i := range dst0.Pix {
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dst0.Pix[i] = uint8(i / 4)
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dst1.Pix[i] = uint8(i / 4)
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}
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var interp func(dst *image.RGBA)
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if transform {
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interp = func(dst *image.RGBA) {
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q.Transform(dst, transformMatrix(3.75, 2, 1), src, src.Bounds(), Over, nil)
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}
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} else {
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interp = func(dst *image.RGBA) {
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q.Scale(dst, outer, src, src.Bounds(), Over, nil)
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}
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}
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// Interpolate then clip.
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interp(dst0)
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dst0 = dst0.SubImage(inner).(*image.RGBA)
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// Clip then interpolate.
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dst1 = dst1.SubImage(inner).(*image.RGBA)
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interp(dst1)
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loop:
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for y := inner.Min.Y; y < inner.Max.Y; y++ {
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for x := inner.Min.X; x < inner.Max.X; x++ {
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if c0, c1 := dst0.RGBAAt(x, y), dst1.RGBAAt(x, y); c0 != c1 {
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t.Errorf("q=%T: at (%d, %d): c0=%v, c1=%v", q, x, y, c0, c1)
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break loop
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}
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}
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}
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}
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}
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}
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// translatedImage is an image m translated by t.
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type translatedImage struct {
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m image.Image
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t image.Point
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}
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func (t *translatedImage) At(x, y int) color.Color { return t.m.At(x-t.t.X, y-t.t.Y) }
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func (t *translatedImage) Bounds() image.Rectangle { return t.m.Bounds().Add(t.t) }
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func (t *translatedImage) ColorModel() color.Model { return t.m.ColorModel() }
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// TestSrcTranslationInvariance tests that Scale and Transform are invariant
|
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|
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// under src translations. Specifically, when some source pixels are not in the
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|
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// bottom-right quadrant of src coordinate space, we consistently round down,
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|
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// not round towards zero.
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||
|
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func TestSrcTranslationInvariance(t *testing.T) {
|
||
|
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f, err := os.Open("../testdata/testpattern.png")
|
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|
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if err != nil {
|
||
|
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t.Fatalf("Open: %v", err)
|
||
|
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}
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||
|
|
defer f.Close()
|
||
|
|
src, _, err := image.Decode(f)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatalf("Decode: %v", err)
|
||
|
|
}
|
||
|
|
sr := image.Rect(2, 3, 16, 12)
|
||
|
|
if !sr.In(src.Bounds()) {
|
||
|
|
t.Fatalf("src bounds too small: got %v", src.Bounds())
|
||
|
|
}
|
||
|
|
qs := []Interpolator{
|
||
|
|
NearestNeighbor,
|
||
|
|
ApproxBiLinear,
|
||
|
|
CatmullRom,
|
||
|
|
}
|
||
|
|
deltas := []image.Point{
|
||
|
|
{+0, +0},
|
||
|
|
{+0, +5},
|
||
|
|
{+0, -5},
|
||
|
|
{+5, +0},
|
||
|
|
{-5, +0},
|
||
|
|
{+8, +8},
|
||
|
|
{+8, -8},
|
||
|
|
{-8, +8},
|
||
|
|
{-8, -8},
|
||
|
|
}
|
||
|
|
m00 := transformMatrix(3.75, 0, 0)
|
||
|
|
|
||
|
|
for _, transform := range []bool{false, true} {
|
||
|
|
for _, q := range qs {
|
||
|
|
want := image.NewRGBA(image.Rect(0, 0, 20, 20))
|
||
|
|
if transform {
|
||
|
|
q.Transform(want, m00, src, sr, Over, nil)
|
||
|
|
} else {
|
||
|
|
q.Scale(want, want.Bounds(), src, sr, Over, nil)
|
||
|
|
}
|
||
|
|
for _, delta := range deltas {
|
||
|
|
tsrc := &translatedImage{src, delta}
|
||
|
|
got := image.NewRGBA(image.Rect(0, 0, 20, 20))
|
||
|
|
if transform {
|
||
|
|
m := matMul(&m00, &f64.Aff3{
|
||
|
|
1, 0, -float64(delta.X),
|
||
|
|
0, 1, -float64(delta.Y),
|
||
|
|
})
|
||
|
|
q.Transform(got, m, tsrc, sr.Add(delta), Over, nil)
|
||
|
|
} else {
|
||
|
|
q.Scale(got, got.Bounds(), tsrc, sr.Add(delta), Over, nil)
|
||
|
|
}
|
||
|
|
if !bytes.Equal(got.Pix, want.Pix) {
|
||
|
|
t.Errorf("pix differ for delta=%v, transform=%t, q=%T", delta, transform, q)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func TestSrcMask(t *testing.T) {
|
||
|
|
srcMask := image.NewRGBA(image.Rect(0, 0, 23, 1))
|
||
|
|
srcMask.SetRGBA(19, 0, color.RGBA{0x00, 0x00, 0x00, 0x7f})
|
||
|
|
srcMask.SetRGBA(20, 0, color.RGBA{0x00, 0x00, 0x00, 0xff})
|
||
|
|
srcMask.SetRGBA(21, 0, color.RGBA{0x00, 0x00, 0x00, 0x3f})
|
||
|
|
srcMask.SetRGBA(22, 0, color.RGBA{0x00, 0x00, 0x00, 0x00})
|
||
|
|
red := image.NewUniform(color.RGBA{0xff, 0x00, 0x00, 0xff})
|
||
|
|
blue := image.NewUniform(color.RGBA{0x00, 0x00, 0xff, 0xff})
|
||
|
|
dst := image.NewRGBA(image.Rect(0, 0, 6, 1))
|
||
|
|
Copy(dst, image.Point{}, blue, dst.Bounds(), Src, nil)
|
||
|
|
NearestNeighbor.Scale(dst, dst.Bounds(), red, image.Rect(0, 0, 3, 1), Over, &Options{
|
||
|
|
SrcMask: srcMask,
|
||
|
|
SrcMaskP: image.Point{20, 0},
|
||
|
|
})
|
||
|
|
got := [6]color.RGBA{
|
||
|
|
dst.RGBAAt(0, 0),
|
||
|
|
dst.RGBAAt(1, 0),
|
||
|
|
dst.RGBAAt(2, 0),
|
||
|
|
dst.RGBAAt(3, 0),
|
||
|
|
dst.RGBAAt(4, 0),
|
||
|
|
dst.RGBAAt(5, 0),
|
||
|
|
}
|
||
|
|
want := [6]color.RGBA{
|
||
|
|
{0xff, 0x00, 0x00, 0xff},
|
||
|
|
{0xff, 0x00, 0x00, 0xff},
|
||
|
|
{0x3f, 0x00, 0xc0, 0xff},
|
||
|
|
{0x3f, 0x00, 0xc0, 0xff},
|
||
|
|
{0x00, 0x00, 0xff, 0xff},
|
||
|
|
{0x00, 0x00, 0xff, 0xff},
|
||
|
|
}
|
||
|
|
if got != want {
|
||
|
|
t.Errorf("\ngot %v\nwant %v", got, want)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func TestDstMask(t *testing.T) {
|
||
|
|
dstMask := image.NewRGBA(image.Rect(0, 0, 23, 1))
|
||
|
|
dstMask.SetRGBA(19, 0, color.RGBA{0x00, 0x00, 0x00, 0x7f})
|
||
|
|
dstMask.SetRGBA(20, 0, color.RGBA{0x00, 0x00, 0x00, 0xff})
|
||
|
|
dstMask.SetRGBA(21, 0, color.RGBA{0x00, 0x00, 0x00, 0x3f})
|
||
|
|
dstMask.SetRGBA(22, 0, color.RGBA{0x00, 0x00, 0x00, 0x00})
|
||
|
|
red := image.NewRGBA(image.Rect(0, 0, 1, 1))
|
||
|
|
red.SetRGBA(0, 0, color.RGBA{0xff, 0x00, 0x00, 0xff})
|
||
|
|
blue := image.NewUniform(color.RGBA{0x00, 0x00, 0xff, 0xff})
|
||
|
|
qs := []Interpolator{
|
||
|
|
NearestNeighbor,
|
||
|
|
ApproxBiLinear,
|
||
|
|
CatmullRom,
|
||
|
|
}
|
||
|
|
for _, q := range qs {
|
||
|
|
dst := image.NewRGBA(image.Rect(0, 0, 3, 1))
|
||
|
|
Copy(dst, image.Point{}, blue, dst.Bounds(), Src, nil)
|
||
|
|
q.Scale(dst, dst.Bounds(), red, red.Bounds(), Over, &Options{
|
||
|
|
DstMask: dstMask,
|
||
|
|
DstMaskP: image.Point{20, 0},
|
||
|
|
})
|
||
|
|
got := [3]color.RGBA{
|
||
|
|
dst.RGBAAt(0, 0),
|
||
|
|
dst.RGBAAt(1, 0),
|
||
|
|
dst.RGBAAt(2, 0),
|
||
|
|
}
|
||
|
|
want := [3]color.RGBA{
|
||
|
|
{0xff, 0x00, 0x00, 0xff},
|
||
|
|
{0x3f, 0x00, 0xc0, 0xff},
|
||
|
|
{0x00, 0x00, 0xff, 0xff},
|
||
|
|
}
|
||
|
|
if got != want {
|
||
|
|
t.Errorf("q=%T:\ngot %v\nwant %v", q, got, want)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func TestRectDstMask(t *testing.T) {
|
||
|
|
f, err := os.Open("../testdata/testpattern.png")
|
||
|
|
if err != nil {
|
||
|
|
t.Fatalf("Open: %v", err)
|
||
|
|
}
|
||
|
|
defer f.Close()
|
||
|
|
src, _, err := image.Decode(f)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatalf("Decode: %v", err)
|
||
|
|
}
|
||
|
|
m00 := transformMatrix(1, 0, 0)
|
||
|
|
|
||
|
|
bounds := image.Rect(0, 0, 50, 50)
|
||
|
|
dstOutside := image.NewRGBA(bounds)
|
||
|
|
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
|
||
|
|
for x := bounds.Min.X; x < bounds.Max.X; x++ {
|
||
|
|
dstOutside.SetRGBA(x, y, color.RGBA{uint8(5 * x), uint8(5 * y), 0x00, 0xff})
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
mk := func(q Transformer, dstMask image.Image, dstMaskP image.Point) *image.RGBA {
|
||
|
|
m := image.NewRGBA(bounds)
|
||
|
|
Copy(m, bounds.Min, dstOutside, bounds, Src, nil)
|
||
|
|
q.Transform(m, m00, src, src.Bounds(), Over, &Options{
|
||
|
|
DstMask: dstMask,
|
||
|
|
DstMaskP: dstMaskP,
|
||
|
|
})
|
||
|
|
return m
|
||
|
|
}
|
||
|
|
|
||
|
|
qs := []Interpolator{
|
||
|
|
NearestNeighbor,
|
||
|
|
ApproxBiLinear,
|
||
|
|
CatmullRom,
|
||
|
|
}
|
||
|
|
dstMaskPs := []image.Point{
|
||
|
|
{0, 0},
|
||
|
|
{5, 7},
|
||
|
|
{-3, 0},
|
||
|
|
}
|
||
|
|
rect := image.Rect(10, 10, 30, 40)
|
||
|
|
for _, q := range qs {
|
||
|
|
for _, dstMaskP := range dstMaskPs {
|
||
|
|
dstInside := mk(q, nil, image.Point{})
|
||
|
|
for _, wrap := range []bool{false, true} {
|
||
|
|
// TODO: replace "rectImage(rect)" with "rect" once Go 1.5 is
|
||
|
|
// released, where an image.Rectangle implements image.Image.
|
||
|
|
dstMask := image.Image(rectImage(rect))
|
||
|
|
if wrap {
|
||
|
|
dstMask = srcWrapper{dstMask}
|
||
|
|
}
|
||
|
|
dst := mk(q, dstMask, dstMaskP)
|
||
|
|
|
||
|
|
nError := 0
|
||
|
|
loop:
|
||
|
|
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
|
||
|
|
for x := bounds.Min.X; x < bounds.Max.X; x++ {
|
||
|
|
which := dstOutside
|
||
|
|
if (image.Point{x, y}).Add(dstMaskP).In(rect) {
|
||
|
|
which = dstInside
|
||
|
|
}
|
||
|
|
if got, want := dst.RGBAAt(x, y), which.RGBAAt(x, y); got != want {
|
||
|
|
if nError == 10 {
|
||
|
|
t.Errorf("q=%T dmp=%v wrap=%v: ...and more errors", q, dstMaskP, wrap)
|
||
|
|
break loop
|
||
|
|
}
|
||
|
|
nError++
|
||
|
|
t.Errorf("q=%T dmp=%v wrap=%v: x=%3d y=%3d: got %v, want %v",
|
||
|
|
q, dstMaskP, wrap, x, y, got, want)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func TestDstMaskSameSizeCopy(t *testing.T) {
|
||
|
|
bounds := image.Rect(0, 0, 42, 42)
|
||
|
|
src := image.Opaque
|
||
|
|
dst := image.NewRGBA(bounds)
|
||
|
|
mask := image.NewRGBA(bounds)
|
||
|
|
|
||
|
|
Copy(dst, image.ZP, src, bounds, Src, &Options{
|
||
|
|
DstMask: mask,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO: delete this wrapper type once Go 1.5 is released, where an
|
||
|
|
// image.Rectangle implements image.Image.
|
||
|
|
type rectImage image.Rectangle
|
||
|
|
|
||
|
|
func (r rectImage) ColorModel() color.Model { return color.Alpha16Model }
|
||
|
|
func (r rectImage) Bounds() image.Rectangle { return image.Rectangle(r) }
|
||
|
|
func (r rectImage) At(x, y int) color.Color {
|
||
|
|
if (image.Point{x, y}).In(image.Rectangle(r)) {
|
||
|
|
return color.Opaque
|
||
|
|
}
|
||
|
|
return color.Transparent
|
||
|
|
}
|
||
|
|
|
||
|
|
// The fooWrapper types wrap the dst or src image to avoid triggering the
|
||
|
|
// type-specific fast path implementations.
|
||
|
|
type (
|
||
|
|
dstWrapper struct{ Image }
|
||
|
|
srcWrapper struct{ image.Image }
|
||
|
|
)
|
||
|
|
|
||
|
|
func srcGray(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
m := image.NewGray(boundsHint)
|
||
|
|
fillPix(rand.New(rand.NewSource(0)), m.Pix)
|
||
|
|
return m, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcNRGBA(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
m := image.NewNRGBA(boundsHint)
|
||
|
|
fillPix(rand.New(rand.NewSource(1)), m.Pix)
|
||
|
|
return m, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcRGBA(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
m := image.NewRGBA(boundsHint)
|
||
|
|
fillPix(rand.New(rand.NewSource(2)), m.Pix)
|
||
|
|
// RGBA is alpha-premultiplied, so the R, G and B values should
|
||
|
|
// be <= the A values.
|
||
|
|
for i := 0; i < len(m.Pix); i += 4 {
|
||
|
|
m.Pix[i+0] = uint8(uint32(m.Pix[i+0]) * uint32(m.Pix[i+3]) / 0xff)
|
||
|
|
m.Pix[i+1] = uint8(uint32(m.Pix[i+1]) * uint32(m.Pix[i+3]) / 0xff)
|
||
|
|
m.Pix[i+2] = uint8(uint32(m.Pix[i+2]) * uint32(m.Pix[i+3]) / 0xff)
|
||
|
|
}
|
||
|
|
return m, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcUnif(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
return image.NewUniform(color.RGBA64{0x1234, 0x5555, 0x9181, 0xbeef}), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcYCbCr(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
m := image.NewYCbCr(boundsHint, image.YCbCrSubsampleRatio420)
|
||
|
|
fillPix(rand.New(rand.NewSource(3)), m.Y, m.Cb, m.Cr)
|
||
|
|
return m, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcLarge(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
// 3072 x 2304 is over 7 million pixels at 4:3, comparable to a
|
||
|
|
// 2015 smart-phone camera's output.
|
||
|
|
return srcYCbCr(image.Rect(0, 0, 3072, 2304))
|
||
|
|
}
|
||
|
|
|
||
|
|
func srcTux(boundsHint image.Rectangle) (image.Image, error) {
|
||
|
|
// tux.png is a 386 x 395 image.
|
||
|
|
f, err := os.Open("../testdata/tux.png")
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("Open: %v", err)
|
||
|
|
}
|
||
|
|
defer f.Close()
|
||
|
|
src, err := png.Decode(f)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("Decode: %v", err)
|
||
|
|
}
|
||
|
|
return src, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func benchScale(b *testing.B, w int, h int, op Op, srcf func(image.Rectangle) (image.Image, error), q Interpolator) {
|
||
|
|
dst := image.NewRGBA(image.Rect(0, 0, w, h))
|
||
|
|
src, err := srcf(image.Rect(0, 0, 1024, 768))
|
||
|
|
if err != nil {
|
||
|
|
b.Fatal(err)
|
||
|
|
}
|
||
|
|
dr, sr := dst.Bounds(), src.Bounds()
|
||
|
|
scaler := Scaler(q)
|
||
|
|
if n, ok := q.(interface {
|
||
|
|
NewScaler(int, int, int, int) Scaler
|
||
|
|
}); ok {
|
||
|
|
scaler = n.NewScaler(dr.Dx(), dr.Dy(), sr.Dx(), sr.Dy())
|
||
|
|
}
|
||
|
|
|
||
|
|
b.ReportAllocs()
|
||
|
|
b.ResetTimer()
|
||
|
|
for i := 0; i < b.N; i++ {
|
||
|
|
scaler.Scale(dst, dr, src, sr, op, nil)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func benchTform(b *testing.B, w int, h int, op Op, srcf func(image.Rectangle) (image.Image, error), q Interpolator) {
|
||
|
|
dst := image.NewRGBA(image.Rect(0, 0, w, h))
|
||
|
|
src, err := srcf(image.Rect(0, 0, 1024, 768))
|
||
|
|
if err != nil {
|
||
|
|
b.Fatal(err)
|
||
|
|
}
|
||
|
|
sr := src.Bounds()
|
||
|
|
m := transformMatrix(3.75, 40, 10)
|
||
|
|
|
||
|
|
b.ReportAllocs()
|
||
|
|
b.ResetTimer()
|
||
|
|
for i := 0; i < b.N; i++ {
|
||
|
|
q.Transform(dst, m, src, sr, op, nil)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func BenchmarkScaleNNLargeDown(b *testing.B) { benchScale(b, 200, 150, Src, srcLarge, NearestNeighbor) }
|
||
|
|
func BenchmarkScaleABLargeDown(b *testing.B) { benchScale(b, 200, 150, Src, srcLarge, ApproxBiLinear) }
|
||
|
|
func BenchmarkScaleBLLargeDown(b *testing.B) { benchScale(b, 200, 150, Src, srcLarge, BiLinear) }
|
||
|
|
func BenchmarkScaleCRLargeDown(b *testing.B) { benchScale(b, 200, 150, Src, srcLarge, CatmullRom) }
|
||
|
|
|
||
|
|
func BenchmarkScaleNNDown(b *testing.B) { benchScale(b, 120, 80, Src, srcTux, NearestNeighbor) }
|
||
|
|
func BenchmarkScaleABDown(b *testing.B) { benchScale(b, 120, 80, Src, srcTux, ApproxBiLinear) }
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func BenchmarkScaleBLDown(b *testing.B) { benchScale(b, 120, 80, Src, srcTux, BiLinear) }
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func BenchmarkScaleCRDown(b *testing.B) { benchScale(b, 120, 80, Src, srcTux, CatmullRom) }
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func BenchmarkScaleNNUp(b *testing.B) { benchScale(b, 800, 600, Src, srcTux, NearestNeighbor) }
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func BenchmarkScaleABUp(b *testing.B) { benchScale(b, 800, 600, Src, srcTux, ApproxBiLinear) }
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func BenchmarkScaleBLUp(b *testing.B) { benchScale(b, 800, 600, Src, srcTux, BiLinear) }
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func BenchmarkScaleCRUp(b *testing.B) { benchScale(b, 800, 600, Src, srcTux, CatmullRom) }
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func BenchmarkScaleNNSrcRGBA(b *testing.B) { benchScale(b, 200, 150, Src, srcRGBA, NearestNeighbor) }
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func BenchmarkScaleNNSrcUnif(b *testing.B) { benchScale(b, 200, 150, Src, srcUnif, NearestNeighbor) }
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func BenchmarkScaleNNOverRGBA(b *testing.B) { benchScale(b, 200, 150, Over, srcRGBA, NearestNeighbor) }
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func BenchmarkScaleNNOverUnif(b *testing.B) { benchScale(b, 200, 150, Over, srcUnif, NearestNeighbor) }
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func BenchmarkTformNNSrcRGBA(b *testing.B) { benchTform(b, 200, 150, Src, srcRGBA, NearestNeighbor) }
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func BenchmarkTformNNSrcUnif(b *testing.B) { benchTform(b, 200, 150, Src, srcUnif, NearestNeighbor) }
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func BenchmarkTformNNOverRGBA(b *testing.B) { benchTform(b, 200, 150, Over, srcRGBA, NearestNeighbor) }
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func BenchmarkTformNNOverUnif(b *testing.B) { benchTform(b, 200, 150, Over, srcUnif, NearestNeighbor) }
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func BenchmarkScaleABSrcGray(b *testing.B) { benchScale(b, 200, 150, Src, srcGray, ApproxBiLinear) }
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func BenchmarkScaleABSrcNRGBA(b *testing.B) { benchScale(b, 200, 150, Src, srcNRGBA, ApproxBiLinear) }
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func BenchmarkScaleABSrcRGBA(b *testing.B) { benchScale(b, 200, 150, Src, srcRGBA, ApproxBiLinear) }
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func BenchmarkScaleABSrcYCbCr(b *testing.B) { benchScale(b, 200, 150, Src, srcYCbCr, ApproxBiLinear) }
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func BenchmarkScaleABOverGray(b *testing.B) { benchScale(b, 200, 150, Over, srcGray, ApproxBiLinear) }
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func BenchmarkScaleABOverNRGBA(b *testing.B) { benchScale(b, 200, 150, Over, srcNRGBA, ApproxBiLinear) }
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func BenchmarkScaleABOverRGBA(b *testing.B) { benchScale(b, 200, 150, Over, srcRGBA, ApproxBiLinear) }
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func BenchmarkScaleABOverYCbCr(b *testing.B) { benchScale(b, 200, 150, Over, srcYCbCr, ApproxBiLinear) }
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func BenchmarkTformABSrcGray(b *testing.B) { benchTform(b, 200, 150, Src, srcGray, ApproxBiLinear) }
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func BenchmarkTformABSrcNRGBA(b *testing.B) { benchTform(b, 200, 150, Src, srcNRGBA, ApproxBiLinear) }
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func BenchmarkTformABSrcRGBA(b *testing.B) { benchTform(b, 200, 150, Src, srcRGBA, ApproxBiLinear) }
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func BenchmarkTformABSrcYCbCr(b *testing.B) { benchTform(b, 200, 150, Src, srcYCbCr, ApproxBiLinear) }
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func BenchmarkTformABOverGray(b *testing.B) { benchTform(b, 200, 150, Over, srcGray, ApproxBiLinear) }
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func BenchmarkTformABOverNRGBA(b *testing.B) { benchTform(b, 200, 150, Over, srcNRGBA, ApproxBiLinear) }
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func BenchmarkTformABOverRGBA(b *testing.B) { benchTform(b, 200, 150, Over, srcRGBA, ApproxBiLinear) }
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func BenchmarkTformABOverYCbCr(b *testing.B) { benchTform(b, 200, 150, Over, srcYCbCr, ApproxBiLinear) }
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func BenchmarkScaleCRSrcGray(b *testing.B) { benchScale(b, 200, 150, Src, srcGray, CatmullRom) }
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func BenchmarkScaleCRSrcNRGBA(b *testing.B) { benchScale(b, 200, 150, Src, srcNRGBA, CatmullRom) }
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func BenchmarkScaleCRSrcRGBA(b *testing.B) { benchScale(b, 200, 150, Src, srcRGBA, CatmullRom) }
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func BenchmarkScaleCRSrcYCbCr(b *testing.B) { benchScale(b, 200, 150, Src, srcYCbCr, CatmullRom) }
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func BenchmarkScaleCROverGray(b *testing.B) { benchScale(b, 200, 150, Over, srcGray, CatmullRom) }
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func BenchmarkScaleCROverNRGBA(b *testing.B) { benchScale(b, 200, 150, Over, srcNRGBA, CatmullRom) }
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func BenchmarkScaleCROverRGBA(b *testing.B) { benchScale(b, 200, 150, Over, srcRGBA, CatmullRom) }
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func BenchmarkScaleCROverYCbCr(b *testing.B) { benchScale(b, 200, 150, Over, srcYCbCr, CatmullRom) }
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func BenchmarkTformCRSrcGray(b *testing.B) { benchTform(b, 200, 150, Src, srcGray, CatmullRom) }
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func BenchmarkTformCRSrcNRGBA(b *testing.B) { benchTform(b, 200, 150, Src, srcNRGBA, CatmullRom) }
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func BenchmarkTformCRSrcRGBA(b *testing.B) { benchTform(b, 200, 150, Src, srcRGBA, CatmullRom) }
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func BenchmarkTformCRSrcYCbCr(b *testing.B) { benchTform(b, 200, 150, Src, srcYCbCr, CatmullRom) }
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func BenchmarkTformCROverGray(b *testing.B) { benchTform(b, 200, 150, Over, srcGray, CatmullRom) }
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func BenchmarkTformCROverNRGBA(b *testing.B) { benchTform(b, 200, 150, Over, srcNRGBA, CatmullRom) }
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func BenchmarkTformCROverRGBA(b *testing.B) { benchTform(b, 200, 150, Over, srcRGBA, CatmullRom) }
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func BenchmarkTformCROverYCbCr(b *testing.B) { benchTform(b, 200, 150, Over, srcYCbCr, CatmullRom) }
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