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// Copyright 2012 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 tiff
import (
"bytes"
"image"
"io/ioutil"
"os"
"testing"
)
var roundtripTests = []struct {
filename string
opts *Options
}{
{"video-001.tiff", nil},
{"video-001-16bit.tiff", nil},
{"video-001-gray.tiff", nil},
{"video-001-gray-16bit.tiff", nil},
{"video-001-paletted.tiff", nil},
{"bw-packbits.tiff", nil},
{"video-001.tiff", &Options{Predictor: true}},
{"video-001.tiff", &Options{Compression: Deflate}},
{"video-001.tiff", &Options{Predictor: true, Compression: Deflate}},
}
func openImage(filename string) (image.Image, error) {
f, err := os.Open(testdataDir + filename)
if err != nil {
return nil, err
}
defer f.Close()
return Decode(f)
}
func TestRoundtrip(t *testing.T) {
for _, rt := range roundtripTests {
img, err := openImage(rt.filename)
if err != nil {
t.Fatal(err)
}
out := new(bytes.Buffer)
err = Encode(out, img, rt.opts)
if err != nil {
t.Fatal(err)
}
img2, err := Decode(&buffer{buf: out.Bytes()})
if err != nil {
t.Fatal(err)
}
compare(t, img, img2)
}
}
// TestRoundtrip2 tests that encoding and decoding an image whose
// origin is not (0, 0) gives the same thing.
func TestRoundtrip2(t *testing.T) {
m0 := image.NewRGBA(image.Rect(3, 4, 9, 8))
for i := range m0.Pix {
m0.Pix[i] = byte(i)
}
out := new(bytes.Buffer)
if err := Encode(out, m0, nil); err != nil {
t.Fatal(err)
}
m1, err := Decode(&buffer{buf: out.Bytes()})
if err != nil {
t.Fatal(err)
}
compare(t, m0, m1)
}
func benchmarkEncode(b *testing.B, name string, pixelSize int) {
img, err := openImage(name)
if err != nil {
b.Fatal(err)
}
s := img.Bounds().Size()
b.SetBytes(int64(s.X * s.Y * pixelSize))
b.ResetTimer()
for i := 0; i < b.N; i++ {
Encode(ioutil.Discard, img, nil)
}
}
func BenchmarkEncode(b *testing.B) { benchmarkEncode(b, "video-001.tiff", 4) }
func BenchmarkEncodePaletted(b *testing.B) { benchmarkEncode(b, "video-001-paletted.tiff", 1) }
func BenchmarkEncodeGray(b *testing.B) { benchmarkEncode(b, "video-001-gray.tiff", 1) }
func BenchmarkEncodeGray16(b *testing.B) { benchmarkEncode(b, "video-001-gray-16bit.tiff", 2) }
func BenchmarkEncodeRGBA(b *testing.B) { benchmarkEncode(b, "video-001.tiff", 4) }
func BenchmarkEncodeRGBA64(b *testing.B) { benchmarkEncode(b, "video-001-16bit.tiff", 8) }
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