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// Copyright 2011 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 qr
import (
"bytes"
"image"
"image/color"
"image/png"
"io/ioutil"
"testing"
)
func TestPNG(t *testing.T) {
c, err := Encode("hello, world", L)
if err != nil {
t.Fatal(err)
}
pngdat := c.PNG()
if true {
ioutil.WriteFile("x.png", pngdat, 0666)
}
m, err := png.Decode(bytes.NewBuffer(pngdat))
if err != nil {
t.Fatal(err)
}
gm := m.(*image.Gray)
scale := c.Scale
siz := c.Size
nbad := 0
for y := 0; y < scale*(8+siz); y++ {
for x := 0; x < scale*(8+siz); x++ {
v := byte(255)
if c.Black(x/scale-4, y/scale-4) {
v = 0
}
if gv := gm.At(x, y).(color.Gray).Y; gv != v {
t.Errorf("%d,%d = %d, want %d", x, y, gv, v)
if nbad++; nbad >= 20 {
t.Fatalf("too many bad pixels")
}
}
}
}
}
func BenchmarkPNG(b *testing.B) {
c, err := Encode("0123456789012345678901234567890123456789", L)
if err != nil {
panic(err)
}
var bytes []byte
for i := 0; i < b.N; i++ {
bytes = c.PNG()
}
b.SetBytes(int64(len(bytes)))
}
func BenchmarkImagePNG(b *testing.B) {
c, err := Encode("0123456789012345678901234567890123456789", L)
if err != nil {
panic(err)
}
var buf bytes.Buffer
for i := 0; i < b.N; i++ {
buf.Reset()
png.Encode(&buf, c.Image())
}
b.SetBytes(int64(buf.Len()))
}
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