mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 05:51:04 +00:00
131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
// 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 image_test
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"image"
|
|
"image/color"
|
|
"os"
|
|
"testing"
|
|
|
|
_ "image/gif"
|
|
_ "image/jpeg"
|
|
_ "image/png"
|
|
)
|
|
|
|
type imageTest struct {
|
|
goldenFilename string
|
|
filename string
|
|
tolerance int
|
|
}
|
|
|
|
var imageTests = []imageTest{
|
|
{"testdata/video-001.png", "testdata/video-001.png", 0},
|
|
// GIF images are restricted to a 256-color palette and the conversion
|
|
// to GIF loses significant image quality.
|
|
{"testdata/video-001.png", "testdata/video-001.gif", 64 << 8},
|
|
{"testdata/video-001.png", "testdata/video-001.interlaced.gif", 64 << 8},
|
|
{"testdata/video-001.png", "testdata/video-001.5bpp.gif", 128 << 8},
|
|
// JPEG is a lossy format and hence needs a non-zero tolerance.
|
|
{"testdata/video-001.png", "testdata/video-001.jpeg", 8 << 8},
|
|
{"testdata/video-001.png", "testdata/video-001.progressive.jpeg", 8 << 8},
|
|
{"testdata/video-001.221212.png", "testdata/video-001.221212.jpeg", 8 << 8},
|
|
{"testdata/video-001.cmyk.png", "testdata/video-001.cmyk.jpeg", 8 << 8},
|
|
{"testdata/video-001.rgb.png", "testdata/video-001.rgb.jpeg", 8 << 8},
|
|
// Grayscale images.
|
|
{"testdata/video-005.gray.png", "testdata/video-005.gray.jpeg", 8 << 8},
|
|
{"testdata/video-005.gray.png", "testdata/video-005.gray.png", 0},
|
|
}
|
|
|
|
func decode(filename string) (image.Image, string, error) {
|
|
f, err := os.Open(filename)
|
|
if err != nil {
|
|
return nil, "", err
|
|
}
|
|
defer f.Close()
|
|
return image.Decode(bufio.NewReader(f))
|
|
}
|
|
|
|
func decodeConfig(filename string) (image.Config, string, error) {
|
|
f, err := os.Open(filename)
|
|
if err != nil {
|
|
return image.Config{}, "", err
|
|
}
|
|
defer f.Close()
|
|
return image.DecodeConfig(bufio.NewReader(f))
|
|
}
|
|
|
|
func delta(u0, u1 uint32) int {
|
|
d := int(u0) - int(u1)
|
|
if d < 0 {
|
|
return -d
|
|
}
|
|
return d
|
|
}
|
|
|
|
func withinTolerance(c0, c1 color.Color, tolerance int) bool {
|
|
r0, g0, b0, a0 := c0.RGBA()
|
|
r1, g1, b1, a1 := c1.RGBA()
|
|
r := delta(r0, r1)
|
|
g := delta(g0, g1)
|
|
b := delta(b0, b1)
|
|
a := delta(a0, a1)
|
|
return r <= tolerance && g <= tolerance && b <= tolerance && a <= tolerance
|
|
}
|
|
|
|
func TestDecode(t *testing.T) {
|
|
rgba := func(c color.Color) string {
|
|
r, g, b, a := c.RGBA()
|
|
return fmt.Sprintf("rgba = 0x%04x, 0x%04x, 0x%04x, 0x%04x for %T%v", r, g, b, a, c, c)
|
|
}
|
|
|
|
golden := make(map[string]image.Image)
|
|
loop:
|
|
for _, it := range imageTests {
|
|
g := golden[it.goldenFilename]
|
|
if g == nil {
|
|
var err error
|
|
g, _, err = decode(it.goldenFilename)
|
|
if err != nil {
|
|
t.Errorf("%s: %v", it.goldenFilename, err)
|
|
continue loop
|
|
}
|
|
golden[it.goldenFilename] = g
|
|
}
|
|
m, imageFormat, err := decode(it.filename)
|
|
if err != nil {
|
|
t.Errorf("%s: %v", it.filename, err)
|
|
continue loop
|
|
}
|
|
b := g.Bounds()
|
|
if !b.Eq(m.Bounds()) {
|
|
t.Errorf("%s: got bounds %v want %v", it.filename, m.Bounds(), b)
|
|
continue loop
|
|
}
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
if !withinTolerance(g.At(x, y), m.At(x, y), it.tolerance) {
|
|
t.Errorf("%s: at (%d, %d):\ngot %v\nwant %v",
|
|
it.filename, x, y, rgba(m.At(x, y)), rgba(g.At(x, y)))
|
|
continue loop
|
|
}
|
|
}
|
|
}
|
|
if imageFormat == "gif" {
|
|
// Each frame of a GIF can have a frame-local palette override the
|
|
// GIF-global palette. Thus, image.Decode can yield a different ColorModel
|
|
// than image.DecodeConfig.
|
|
continue
|
|
}
|
|
c, _, err := decodeConfig(it.filename)
|
|
if m.ColorModel() != c.ColorModel {
|
|
t.Errorf("%s: color models differ", it.filename)
|
|
continue loop
|
|
}
|
|
}
|
|
}
|