76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
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// Copyright 2012 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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"fmt"
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"image"
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"os"
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"testing"
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_ "image/png"
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)
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const testdataDir = "../testdata/"
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func compare(t *testing.T, img0, img1 image.Image) error {
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b := img1.Bounds()
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if !b.Eq(img0.Bounds()) {
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return fmt.Errorf("wrong image size: want %s, got %s", img0.Bounds(), b)
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}
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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c0 := img0.At(x, y)
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c1 := img1.At(x, y)
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r0, g0, b0, a0 := c0.RGBA()
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r1, g1, b1, a1 := c1.RGBA()
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if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
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return fmt.Errorf("pixel at (%d, %d) has wrong color: want %v, got %v", x, y, c0, c1)
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}
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}
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}
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return nil
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}
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// TestDecode tests that decoding a PNG image and a BMP image result in the
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// same pixel data.
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func TestDecode(t *testing.T) {
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testCases := []string{
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"video-001",
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"yellow_rose-small",
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}
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for _, tc := range testCases {
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f0, err := os.Open(testdataDir + tc + ".png")
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if err != nil {
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t.Errorf("%s: Open PNG: %v", tc, err)
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continue
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}
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defer f0.Close()
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img0, _, err := image.Decode(f0)
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if err != nil {
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t.Errorf("%s: Decode PNG: %v", tc, err)
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continue
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}
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f1, err := os.Open(testdataDir + tc + ".bmp")
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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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defer f1.Close()
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img1, _, err := image.Decode(f1)
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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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if err := compare(t, img0, img1); err != nil {
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t.Errorf("%s: %v", tc, err)
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continue
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}
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}
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}
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