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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"
"image/color"
"io/ioutil"
"testing"
)
func diff(m0, m1 image.Image) error {
b0, b1 := m0.Bounds(), m1.Bounds()
if !b0.Size().Eq(b1.Size()) {
return fmt.Errorf("dimensions differ: %v vs %v", b0, b1)
}
dx := b1.Min.X - b0.Min.X
dy := b1.Min.Y - b0.Min.Y
for y := b0.Min.Y; y < b0.Max.Y; y++ {
for x := b0.Min.X; x < b0.Max.X; x++ {
c0 := m0.At(x, y)
c1 := m1.At(x+dx, y+dy)
r0, g0, b0, a0 := c0.RGBA()
r1, g1, b1, a1 := c1.RGBA()
if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
return fmt.Errorf("colors differ at (%d, %d): %v vs %v", x, y, c0, c1)
}
}
}
return nil
}
func encodeDecode(m image.Image) (image.Image, error) {
b := bytes.NewBuffer(nil)
err := Encode(b, m)
if err != nil {
return nil, err
}
m, err = Decode(b)
if err != nil {
return nil, err
}
return m, nil
}
func TestWriter(t *testing.T) {
// The filenames variable is declared in reader_test.go.
names := filenames
if testing.Short() {
names = filenamesShort
}
for _, fn := range names {
qfn := "testdata/pngsuite/" + fn + ".png"
// Read the image.
m0, err := readPNG(qfn)
if err != nil {
t.Error(fn, err)
continue
}
// Read the image again, encode it, and decode it.
m1, err := readPNG(qfn)
if err != nil {
t.Error(fn, err)
return
}
m2, err := encodeDecode(m1)
if err != nil {
t.Error(fn, err)
return
}
// Compare the two.
err = diff(m0, m2)
if err != nil {
t.Error(fn, err)
continue
}
}
}
func TestSubImage(t *testing.T) {
m0 := image.NewRGBA(image.Rect(0, 0, 256, 256))
for y := 0; y < 256; y++ {
for x := 0; x < 256; x++ {
m0.Set(x, y, color.RGBA{uint8(x), uint8(y), 0, 255})
}
}
m0 = m0.SubImage(image.Rect(50, 30, 250, 130)).(*image.RGBA)
m1, err := encodeDecode(m0)
if err != nil {
t.Error(err)
return
}
err = diff(m0, m1)
if err != nil {
t.Error(err)
return
}
}
func BenchmarkEncodePaletted(b *testing.B) {
b.StopTimer()
img := image.NewPaletted(image.Rect(0, 0, 640, 480), color.Palette{
color.RGBA{0, 0, 0, 255},
color.RGBA{255, 255, 255, 255},
})
b.SetBytes(640 * 480 * 1)
b.StartTimer()
for i := 0; i < b.N; i++ {
Encode(ioutil.Discard, img)
}
}
func BenchmarkEncodeRGBOpaque(b *testing.B) {
b.StopTimer()
img := image.NewRGBA(image.Rect(0, 0, 640, 480))
// Set all pixels to 0xFF alpha to force opaque mode.
bo := img.Bounds()
for y := bo.Min.Y; y < bo.Max.Y; y++ {
for x := bo.Min.X; x < bo.Max.X; x++ {
img.Set(x, y, color.RGBA{0, 0, 0, 255})
}
}
if !img.Opaque() {
panic("expected image to be opaque")
}
b.SetBytes(640 * 480 * 4)
b.StartTimer()
for i := 0; i < b.N; i++ {
Encode(ioutil.Discard, img)
}
}
func BenchmarkEncodeRGBA(b *testing.B) {
b.StopTimer()
img := image.NewRGBA(image.Rect(0, 0, 640, 480))
if img.Opaque() {
panic("expected image to not be opaque")
}
b.SetBytes(640 * 480 * 4)
b.StartTimer()
for i := 0; i < b.N; i++ {
Encode(ioutil.Discard, img)
}
}
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