initial commit

vendor/golang.org/x/image/bmp/reader_test.go

@@ -0,0 +1,75 @@
+// 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 bmp
+
+import (
+	"fmt"
+	"image"
+	"os"
+	"testing"
+
+	_ "image/png"
+)
+
+const testdataDir = "../testdata/"
+
+func compare(t *testing.T, img0, img1 image.Image) error {
+	b := img1.Bounds()
+	if !b.Eq(img0.Bounds()) {
+		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++ {
+			c0 := img0.At(x, y)
+			c1 := img1.At(x, y)
+			r0, g0, b0, a0 := c0.RGBA()
+			r1, g1, b1, a1 := c1.RGBA()
+			if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 {
+				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) {
+	testCases := []string{
+		"video-001",
+		"yellow_rose-small",
+	}
+
+	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
+		}
+
+		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
+		}
+	}
+}