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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [image/] [png/] [writer_test.go] - Blame information for rev 747

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Line No. Rev Author Line
1 747 jeremybenn 
// 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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        "fmt"
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        "image"
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        "image/color"
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        "io/ioutil"
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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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        m, err = Decode(&b)
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        if err != nil {
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                return nil, err
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        }
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        return m, nil
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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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                        return
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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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                        return
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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 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 BenchmarkEncodePaletted(b *testing.B) {
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        b.StopTimer()
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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.StartTimer()
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        for i := 0; i < b.N; i++ {
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                Encode(ioutil.Discard, img)
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        }
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}
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func BenchmarkEncodeRGBOpaque(b *testing.B) {
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        b.StopTimer()
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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.StartTimer()
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        for i := 0; i < b.N; i++ {
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                Encode(ioutil.Discard, img)
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        }
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}
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func BenchmarkEncodeRGBA(b *testing.B) {
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        b.StopTimer()
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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 to not be opaque")
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        }
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        b.SetBytes(640 * 480 * 4)
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        b.StartTimer()
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        for i := 0; i < b.N; i++ {
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                Encode(ioutil.Discard, img)
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        }
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}

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