mirror of
https://github.com/gopl-zh/gopl-zh.github.com.git
synced 2024-11-04 21:43:42 +00:00
70 lines
1.3 KiB
Go
70 lines
1.3 KiB
Go
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// Copyright 2011 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 qrcode
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import (
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"bytes"
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"image"
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"image/color"
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"image/png"
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"testing"
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)
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func TestPNG(t *testing.T) {
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c, err := Encode("hello, world", L)
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if err != nil {
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t.Fatal(err)
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}
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pngdat := c.PNG()
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m, err := png.Decode(bytes.NewBuffer(pngdat))
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if err != nil {
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t.Fatal(err)
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}
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gm := m.(*image.Gray)
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scale := c.Scale
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siz := c.Size
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nbad := 0
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for y := 0; y < scale*(8+siz); y++ {
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for x := 0; x < scale*(8+siz); x++ {
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v := byte(255)
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if c.Black(x/scale-4, y/scale-4) {
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v = 0
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}
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if gv := gm.At(x, y).(color.Gray).Y; gv != v {
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t.Errorf("%d,%d = %d, want %d", x, y, gv, v)
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if nbad++; nbad >= 20 {
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t.Fatalf("too many bad pixels")
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}
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}
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}
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}
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}
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func BenchmarkPNG(b *testing.B) {
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c, err := Encode("0123456789012345678901234567890123456789", L)
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if err != nil {
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panic(err)
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}
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var bytes []byte
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for i := 0; i < b.N; i++ {
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bytes = c.PNG()
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}
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b.SetBytes(int64(len(bytes)))
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}
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func BenchmarkImagePNG(b *testing.B) {
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c, err := Encode("0123456789012345678901234567890123456789", L)
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if err != nil {
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panic(err)
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}
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var buf bytes.Buffer
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for i := 0; i < b.N; i++ {
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buf.Reset()
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png.Encode(&buf, c.Image())
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}
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b.SetBytes(int64(buf.Len()))
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}
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