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image/gif: add more writer benchmarks
The two existing benchmarks encode randomized pixels, which isn't very representative. The two new benchmarks encode a PNG photo as a GIF. Also rename the benchmarks for consistency. Also fix the bytes-per-op measure for paletted images, which are 1 (not 4) bytes per pixel. Also simplify BenchmarkEncodeRandomPaletted (formerly just called BenchmarkEncode). It doesn't need to generate a random palette (and the GIF encoder largely doesn't care about the palette's RGBA values). Use palette.Plan9 instead, a pre-existing 256-element color palette. Change-Id: I10a6ea4e9590bb0d9f76e8cc0f4a88d43b1d650d Reviewed-on: https://go-review.googlesource.com/c/go/+/248218 Reviewed-by: David Symonds <dsymonds@golang.org>
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@ -9,6 +9,7 @@ import (
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"image"
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"image/color"
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"image/color/palette"
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"image/draw"
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_ "image/png"
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"io/ioutil"
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"math/rand"
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@ -656,25 +657,14 @@ func TestEncodeWrappedImage(t *testing.T) {
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}
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}
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func BenchmarkEncode(b *testing.B) {
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func BenchmarkEncodeRandomPaletted(b *testing.B) {
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img := image.NewPaletted(image.Rect(0, 0, 640, 480), palette.Plan9)
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rnd := rand.New(rand.NewSource(123))
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// Restrict to a 256-color paletted image to avoid quantization path.
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palette := make(color.Palette, 256)
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for i := range palette {
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palette[i] = color.RGBA{
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uint8(rnd.Intn(256)),
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uint8(rnd.Intn(256)),
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uint8(rnd.Intn(256)),
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255,
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}
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}
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img := image.NewPaletted(image.Rect(0, 0, 640, 480), palette)
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for i := range img.Pix {
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img.Pix[i] = uint8(rnd.Intn(256))
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}
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b.SetBytes(640 * 480 * 4)
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b.SetBytes(640 * 480 * 1)
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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@ -682,7 +672,7 @@ func BenchmarkEncode(b *testing.B) {
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}
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}
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func BenchmarkQuantizedEncode(b *testing.B) {
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func BenchmarkEncodeRandomRGBA(b *testing.B) {
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img := image.NewRGBA(image.Rect(0, 0, 640, 480))
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bo := img.Bounds()
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rnd := rand.New(rand.NewSource(123))
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@ -696,6 +686,7 @@ func BenchmarkQuantizedEncode(b *testing.B) {
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})
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}
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}
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b.SetBytes(640 * 480 * 4)
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b.ReportAllocs()
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b.ResetTimer()
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@ -703,3 +694,35 @@ func BenchmarkQuantizedEncode(b *testing.B) {
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Encode(ioutil.Discard, img, nil)
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}
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}
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func BenchmarkEncodeRealisticPaletted(b *testing.B) {
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rgba, err := readImg("../testdata/video-001.png")
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if err != nil {
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b.Fatalf("readImg: %v", err)
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}
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bo := rgba.Bounds()
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img := image.NewPaletted(bo, palette.Plan9)
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draw.Draw(img, bo, rgba, bo.Min, draw.Src)
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b.SetBytes(int64(bo.Dx() * bo.Dy() * 1))
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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Encode(ioutil.Discard, img, nil)
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}
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}
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func BenchmarkEncodeRealisticRGBA(b *testing.B) {
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img, err := readImg("../testdata/video-001.png")
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if err != nil {
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b.Fatalf("readImg: %v", err)
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}
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bo := img.Bounds()
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b.SetBytes(int64(bo.Dx() * bo.Dy() * 4))
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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Encode(ioutil.Discard, img, nil)
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}
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}
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