go.image/bmp: add a test image for top-down BMPs.

LGTM=ruiu
R=ruiu
CC=bsiegert, golang-codereviews
https://golang.org/cl/149090043
This commit is contained in:
Nigel Tao 2014-10-01 09:41:12 +10:00
parent 8a2d4aba20
commit 8d4fc1653b
3 changed files with 37 additions and 21 deletions

View File

@ -5,6 +5,7 @@
package bmp
import (
"fmt"
"image"
"os"
"testing"
@ -14,10 +15,10 @@ import (
const testdataDir = "../testdata/"
func compare(t *testing.T, img0, img1 image.Image) {
func compare(t *testing.T, img0, img1 image.Image) error {
b := img1.Bounds()
if !b.Eq(img0.Bounds()) {
t.Fatalf("wrong image size: want %s, got %s", img0.Bounds(), b)
return fmt.Errorf("wrong image size: want %s, got %s", img0.Bounds(), b)
}
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
@ -26,34 +27,49 @@ func compare(t *testing.T, img0, img1 image.Image) {
r0, g0, b0, a0 := c0.RGBA()
r1, g1, b1, a1 := c1.RGBA()
if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
t.Fatalf("pixel at (%d, %d) has wrong color: want %v, got %v", x, y, c0, c1)
return fmt.Errorf("pixel at (%d, %d) has wrong color: want %v, got %v", x, y, c0, c1)
}
}
}
return nil
}
// TestDecode tests that decoding a PNG image and a BMP image result in the
// same pixel data.
func TestDecode(t *testing.T) {
f0, err := os.Open(testdataDir + "video-001.png")
if err != nil {
t.Fatal(err)
}
defer f0.Close()
img0, _, err := image.Decode(f0)
if err != nil {
t.Fatal(err)
testCases := []string{
"video-001",
"yellow_rose-small",
}
f1, err := os.Open(testdataDir + "video-001.bmp")
if err != nil {
t.Fatal(err)
}
defer f1.Close()
img1, _, err := image.Decode(f1)
if err != nil {
t.Fatal(err)
}
for _, tc := range testCases {
f0, err := os.Open(testdataDir + tc + ".png")
if err != nil {
t.Errorf("%s: Open PNG: %v", tc, err)
continue
}
defer f0.Close()
img0, _, err := image.Decode(f0)
if err != nil {
t.Errorf("%s: Decode PNG: %v", tc, err)
continue
}
compare(t, img0, img1)
f1, err := os.Open(testdataDir + tc + ".bmp")
if err != nil {
t.Errorf("%s: Open BMP: %v", tc, err)
continue
}
defer f1.Close()
img1, _, err := image.Decode(f1)
if err != nil {
t.Errorf("%s: Decode BMP: %v", tc, err)
continue
}
if err := compare(t, img0, img1); err != nil {
t.Errorf("%s: %v", tc, err)
continue
}
}
}

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