diff options
Diffstat (limited to 'src/pkg/image/png/writer_test.go')
| -rw-r--r-- | src/pkg/image/png/writer_test.go | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/src/pkg/image/png/writer_test.go b/src/pkg/image/png/writer_test.go deleted file mode 100644 index d67a81569..000000000 --- a/src/pkg/image/png/writer_test.go +++ /dev/null @@ -1,210 +0,0 @@ -// 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) { - var b bytes.Buffer - err := Encode(&b, m) - if err != nil { - return nil, err - } - return Decode(&b) -} - -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 TestWriterLevels(t *testing.T) { - m := image.NewNRGBA(image.Rect(0, 0, 100, 100)) - - var b1, b2 bytes.Buffer - if err := (&Encoder{}).Encode(&b1, m); err != nil { - t.Fatal(err) - } - noenc := &Encoder{CompressionLevel: NoCompression} - if err := noenc.Encode(&b2, m); err != nil { - t.Fatal(err) - } - - if b2.Len() <= b1.Len() { - t.Error("DefaultCompression encoding was larger than NoCompression encoding") - } - if _, err := Decode(&b1); err != nil { - t.Error("cannot decode DefaultCompression") - } - if _, err := Decode(&b2); err != nil { - t.Error("cannot decode NoCompression") - } -} - -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 BenchmarkEncodeGray(b *testing.B) { - b.StopTimer() - img := image.NewGray(image.Rect(0, 0, 640, 480)) - b.SetBytes(640 * 480 * 1) - b.StartTimer() - for i := 0; i < b.N; i++ { - Encode(ioutil.Discard, img) - } -} - -func BenchmarkEncodeNRGBOpaque(b *testing.B) { - b.StopTimer() - img := image.NewNRGBA(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.NRGBA{0, 0, 0, 255}) - } - } - if !img.Opaque() { - b.Fatal("expected image to be opaque") - } - b.SetBytes(640 * 480 * 4) - b.StartTimer() - for i := 0; i < b.N; i++ { - Encode(ioutil.Discard, img) - } -} - -func BenchmarkEncodeNRGBA(b *testing.B) { - b.StopTimer() - img := image.NewNRGBA(image.Rect(0, 0, 640, 480)) - if img.Opaque() { - b.Fatal("expected image not to be opaque") - } - b.SetBytes(640 * 480 * 4) - b.StartTimer() - for i := 0; i < b.N; i++ { - Encode(ioutil.Discard, img) - } -} - -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() { - b.Fatal("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() { - b.Fatal("expected image not to be opaque") - } - b.SetBytes(640 * 480 * 4) - b.StartTimer() - for i := 0; i < b.N; i++ { - Encode(ioutil.Discard, img) - } -} |