e7c2a4f042
This also fixes the writer test to actually compare the decoded images, so as to make sure it is decoded properly. Implements golang/go#25945. Change-Id: I606887baa11b7664018313cf7d5800b2dc7622cf Reviewed-on: https://go-review.googlesource.com/120095 Reviewed-by: Nigel Tao <nigeltao@golang.org> Run-TryBot: Nigel Tao <nigeltao@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
144 lines
2.9 KiB
Go
144 lines
2.9 KiB
Go
// Copyright 2013 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 bmp
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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/draw"
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"io/ioutil"
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"os"
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"testing"
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"time"
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)
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func openImage(filename string) (image.Image, error) {
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f, err := os.Open(testdataDir + filename)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return Decode(f)
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}
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func convertToRGBA(in image.Image) image.Image {
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b := in.Bounds()
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out := image.NewRGBA(b)
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draw.Draw(out, b, in, b.Min, draw.Src)
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return out
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}
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func convertToNRGBA(in image.Image) image.Image {
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b := in.Bounds()
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out := image.NewNRGBA(b)
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draw.Draw(out, b, in, b.Min, draw.Src)
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return out
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}
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func TestEncode(t *testing.T) {
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testCases := []string{
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"video-001.bmp",
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"yellow_rose-small.bmp",
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}
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for _, tc := range testCases {
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img0, err := openImage(tc)
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if err != nil {
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t.Errorf("%s: Open BMP: %v", tc, err)
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continue
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}
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buf := new(bytes.Buffer)
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err = Encode(buf, img0)
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if err != nil {
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t.Errorf("%s: Encode BMP: %v", tc, err)
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continue
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}
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img1, err := Decode(buf)
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if err != nil {
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t.Errorf("%s: Decode BMP: %v", tc, err)
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continue
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}
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err = compare(t, img0, img1)
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if err != nil {
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t.Errorf("%s: Compare BMP: %v", tc, err)
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continue
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}
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buf2 := new(bytes.Buffer)
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rgba := convertToRGBA(img0)
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err = Encode(buf2, rgba)
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if err != nil {
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t.Errorf("%s: Encode pre-multiplied BMP: %v", tc, err)
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continue
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}
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img2, err := Decode(buf2)
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if err != nil {
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t.Errorf("%s: Decode pre-multiplied BMP: %v", tc, err)
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continue
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}
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// We need to do another round trip to NRGBA to compare to, since
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// the conversion process is lossy.
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img3 := convertToNRGBA(rgba)
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err = compare(t, img3, img2)
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if err != nil {
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t.Errorf("%s: Compare pre-multiplied BMP: %v", tc, err)
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}
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}
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}
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// TestZeroWidthVeryLargeHeight tests that encoding and decoding a degenerate
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// image with zero width but over one billion pixels in height is faster than
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// naively calling an io.Reader or io.Writer method once per row.
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func TestZeroWidthVeryLargeHeight(t *testing.T) {
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c := make(chan error, 1)
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go func() {
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b := image.Rect(0, 0, 0, 0x3fffffff)
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var buf bytes.Buffer
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if err := Encode(&buf, image.NewRGBA(b)); err != nil {
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c <- err
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return
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}
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m, err := Decode(&buf)
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if err != nil {
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c <- err
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return
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}
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if got := m.Bounds(); got != b {
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c <- fmt.Errorf("bounds: got %v, want %v", got, b)
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return
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}
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c <- nil
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}()
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select {
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case err := <-c:
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if err != nil {
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t.Fatal(err)
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}
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case <-time.After(3 * time.Second):
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t.Fatalf("timed out")
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}
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}
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// BenchmarkEncode benchmarks the encoding of an image.
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func BenchmarkEncode(b *testing.B) {
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img, err := openImage("video-001.bmp")
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if err != nil {
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b.Fatal(err)
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}
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s := img.Bounds().Size()
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b.SetBytes(int64(s.X * s.Y * 4))
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b.ResetTimer()
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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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