cfcbb4227f
This does not yet include support for the //go:embed directive added in this release. * Makefile.am (check-runtime): Don't create check-runtime-dir. (mostlyclean-local): Don't remove check-runtime-dir. (check-go-tool, check-vet): Copy in go.mod and modules.txt. (check-cgo-test, check-carchive-test): Add go.mod file. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/280172
343 lines
7.1 KiB
Go
343 lines
7.1 KiB
Go
// Copyright 2009 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 png
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import (
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"bytes"
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"compress/zlib"
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"encoding/binary"
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"fmt"
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"image"
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"image/color"
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"io"
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"testing"
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)
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func diff(m0, m1 image.Image) error {
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b0, b1 := m0.Bounds(), m1.Bounds()
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if !b0.Size().Eq(b1.Size()) {
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return fmt.Errorf("dimensions differ: %v vs %v", b0, b1)
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}
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dx := b1.Min.X - b0.Min.X
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dy := b1.Min.Y - b0.Min.Y
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for y := b0.Min.Y; y < b0.Max.Y; y++ {
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for x := b0.Min.X; x < b0.Max.X; x++ {
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c0 := m0.At(x, y)
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c1 := m1.At(x+dx, y+dy)
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r0, g0, b0, a0 := c0.RGBA()
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r1, g1, b1, a1 := c1.RGBA()
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if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
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return fmt.Errorf("colors differ at (%d, %d): %v vs %v", x, y, c0, c1)
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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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func encodeDecode(m image.Image) (image.Image, error) {
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var b bytes.Buffer
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err := Encode(&b, m)
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if err != nil {
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return nil, err
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}
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return Decode(&b)
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}
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func TestWriter(t *testing.T) {
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// The filenames variable is declared in reader_test.go.
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names := filenames
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if testing.Short() {
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names = filenamesShort
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}
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for _, fn := range names {
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qfn := "testdata/pngsuite/" + fn + ".png"
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// Read the image.
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m0, err := readPNG(qfn)
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if err != nil {
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t.Error(fn, err)
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continue
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}
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// Read the image again, encode it, and decode it.
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m1, err := readPNG(qfn)
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if err != nil {
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t.Error(fn, err)
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continue
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}
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m2, err := encodeDecode(m1)
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if err != nil {
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t.Error(fn, err)
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continue
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}
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// Compare the two.
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err = diff(m0, m2)
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if err != nil {
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t.Error(fn, err)
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continue
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}
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}
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}
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func TestWriterPaletted(t *testing.T) {
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const width, height = 32, 16
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testCases := []struct {
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plen int
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bitdepth uint8
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datalen int
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}{
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{
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plen: 256,
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bitdepth: 8,
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datalen: (1 + width) * height,
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},
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{
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plen: 128,
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bitdepth: 8,
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datalen: (1 + width) * height,
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},
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{
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plen: 16,
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bitdepth: 4,
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datalen: (1 + width/2) * height,
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},
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{
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plen: 4,
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bitdepth: 2,
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datalen: (1 + width/4) * height,
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},
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{
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plen: 2,
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bitdepth: 1,
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datalen: (1 + width/8) * height,
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},
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}
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for _, tc := range testCases {
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t.Run(fmt.Sprintf("plen-%d", tc.plen), func(t *testing.T) {
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// Create a paletted image with the correct palette length
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palette := make(color.Palette, tc.plen)
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for i := range palette {
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palette[i] = color.NRGBA{
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R: uint8(i),
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G: uint8(i),
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B: uint8(i),
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A: 255,
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}
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}
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m0 := image.NewPaletted(image.Rect(0, 0, width, height), palette)
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i := 0
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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m0.SetColorIndex(x, y, uint8(i%tc.plen))
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i++
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}
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}
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// Encode the image
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var b bytes.Buffer
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if err := Encode(&b, m0); err != nil {
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t.Error(err)
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return
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}
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const chunkFieldsLength = 12 // 4 bytes for length, name and crc
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data := b.Bytes()
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i = len(pngHeader)
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for i < len(data)-chunkFieldsLength {
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length := binary.BigEndian.Uint32(data[i : i+4])
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name := string(data[i+4 : i+8])
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switch name {
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case "IHDR":
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bitdepth := data[i+8+8]
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if bitdepth != tc.bitdepth {
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t.Errorf("got bitdepth %d, want %d", bitdepth, tc.bitdepth)
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}
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case "IDAT":
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// Uncompress the image data
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r, err := zlib.NewReader(bytes.NewReader(data[i+8 : i+8+int(length)]))
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if err != nil {
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t.Error(err)
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return
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}
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n, err := io.Copy(io.Discard, r)
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if err != nil {
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t.Errorf("got error while reading image data: %v", err)
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}
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if n != int64(tc.datalen) {
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t.Errorf("got uncompressed data length %d, want %d", n, tc.datalen)
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}
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}
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i += chunkFieldsLength + int(length)
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}
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})
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}
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}
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func TestWriterLevels(t *testing.T) {
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m := image.NewNRGBA(image.Rect(0, 0, 100, 100))
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var b1, b2 bytes.Buffer
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if err := (&Encoder{}).Encode(&b1, m); err != nil {
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t.Fatal(err)
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}
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noenc := &Encoder{CompressionLevel: NoCompression}
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if err := noenc.Encode(&b2, m); err != nil {
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t.Fatal(err)
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}
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if b2.Len() <= b1.Len() {
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t.Error("DefaultCompression encoding was larger than NoCompression encoding")
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}
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if _, err := Decode(&b1); err != nil {
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t.Error("cannot decode DefaultCompression")
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}
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if _, err := Decode(&b2); err != nil {
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t.Error("cannot decode NoCompression")
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}
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}
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func TestSubImage(t *testing.T) {
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m0 := image.NewRGBA(image.Rect(0, 0, 256, 256))
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for y := 0; y < 256; y++ {
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for x := 0; x < 256; x++ {
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m0.Set(x, y, color.RGBA{uint8(x), uint8(y), 0, 255})
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}
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}
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m0 = m0.SubImage(image.Rect(50, 30, 250, 130)).(*image.RGBA)
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m1, err := encodeDecode(m0)
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if err != nil {
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t.Error(err)
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return
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}
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err = diff(m0, m1)
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if err != nil {
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t.Error(err)
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return
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}
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}
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func BenchmarkEncodeGray(b *testing.B) {
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img := image.NewGray(image.Rect(0, 0, 640, 480))
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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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Encode(io.Discard, img)
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}
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}
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type pool struct {
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b *EncoderBuffer
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}
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func (p *pool) Get() *EncoderBuffer {
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return p.b
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}
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func (p *pool) Put(b *EncoderBuffer) {
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p.b = b
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}
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func BenchmarkEncodeGrayWithBufferPool(b *testing.B) {
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img := image.NewGray(image.Rect(0, 0, 640, 480))
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e := Encoder{
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BufferPool: &pool{},
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}
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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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e.Encode(io.Discard, img)
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}
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}
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func BenchmarkEncodeNRGBOpaque(b *testing.B) {
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img := image.NewNRGBA(image.Rect(0, 0, 640, 480))
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// Set all pixels to 0xFF alpha to force opaque mode.
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bo := img.Bounds()
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for y := bo.Min.Y; y < bo.Max.Y; y++ {
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for x := bo.Min.X; x < bo.Max.X; x++ {
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img.Set(x, y, color.NRGBA{0, 0, 0, 255})
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}
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}
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if !img.Opaque() {
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b.Fatal("expected image to be opaque")
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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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for i := 0; i < b.N; i++ {
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Encode(io.Discard, img)
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}
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}
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func BenchmarkEncodeNRGBA(b *testing.B) {
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img := image.NewNRGBA(image.Rect(0, 0, 640, 480))
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if img.Opaque() {
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b.Fatal("expected image not to be opaque")
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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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for i := 0; i < b.N; i++ {
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Encode(io.Discard, img)
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}
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}
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func BenchmarkEncodePaletted(b *testing.B) {
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img := image.NewPaletted(image.Rect(0, 0, 640, 480), color.Palette{
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color.RGBA{0, 0, 0, 255},
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color.RGBA{255, 255, 255, 255},
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})
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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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Encode(io.Discard, img)
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}
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}
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func BenchmarkEncodeRGBOpaque(b *testing.B) {
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img := image.NewRGBA(image.Rect(0, 0, 640, 480))
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// Set all pixels to 0xFF alpha to force opaque mode.
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bo := img.Bounds()
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for y := bo.Min.Y; y < bo.Max.Y; y++ {
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for x := bo.Min.X; x < bo.Max.X; x++ {
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img.Set(x, y, color.RGBA{0, 0, 0, 255})
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}
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}
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if !img.Opaque() {
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b.Fatal("expected image to be opaque")
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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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for i := 0; i < b.N; i++ {
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Encode(io.Discard, img)
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}
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}
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func BenchmarkEncodeRGBA(b *testing.B) {
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img := image.NewRGBA(image.Rect(0, 0, 640, 480))
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if img.Opaque() {
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b.Fatal("expected image not to be opaque")
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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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for i := 0; i < b.N; i++ {
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Encode(io.Discard, img)
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}
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}
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