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// Copyright 2009 The 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 png
import (
"bytes"
"fmt"
"image"
"io"
"os"
"testing"
)
func diff(m0, m1 image.Image) os.Error {
b0, b1 := m0.Bounds(), m1.Bounds()
if !b0.Eq(b1) {
return fmt.Errorf("dimensions differ: %v vs %v", b0, b1)
}
for y := b0.Min.Y; y < b0.Max.Y; y++ {
for x := b0.Min.X; x < b0.Max.X; x++ {
r0, g0, b0, a0 := m0.At(x, y).RGBA()
r1, g1, b1, a1 := m1.At(x, y).RGBA()
if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
return fmt.Errorf("colors differ at (%d, %d): %v vs %v", x, y, m0.At(x, y), m1.At(x, y))
}
}
}
return nil
}
func TestWriter(t *testing.T) {
// The filenames variable is declared in reader_test.go.
for _, fn := range filenames {
qfn := "testdata/pngsuite/" + fn + ".png"
// Read the image.
m0, err := readPng(qfn)
if err != nil {
t.Error(fn, err)
continue
}
// Read the image again, and push it through a pipe that encodes at the write end, and decodes at the read end.
pr, pw := io.Pipe()
defer pr.Close()
go func() {
defer pw.Close()
m1, err := readPng(qfn)
if err != nil {
t.Error(fn, err)
return
}
err = Encode(pw, m1)
if err != nil {
t.Error(fn, err)
return
}
}()
m2, err := Decode(pr)
if err != nil {
t.Error(fn, err)
continue
}
// Compare the two.
err = diff(m0, m2)
if err != nil {
t.Error(fn, err)
continue
}
}
}
func BenchmarkEncodePaletted(b *testing.B) {
b.StopTimer()
img := image.NewPaletted(640, 480,
[]image.Color{
image.RGBAColor{0, 0, 0, 255},
image.RGBAColor{255, 255, 255, 255},
})
b.StartTimer()
buffer := new(bytes.Buffer)
for i := 0; i < b.N; i++ {
buffer.Reset()
Encode(buffer, img)
}
}
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