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Fixes #836.

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R=gri
CC=golang-dev
https://golang.org/cl/1548042
This commit is contained in:
Nigel Tao 2010-06-04 17:30:39 -07:00
parent 2006667931
commit 37fba90bc7
2 changed files with 15 additions and 1 deletions
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2
src/pkg/exp/draw/draw.go
View File

@ -182,7 +182,7 @@ func drawCopyOver(dst *image.RGBA, r Rectangle, src *image.RGBA, sp Point) {
y0, y1 := r.Min.Y, r.Max.Y
for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 {
dpix := dst.Pixel[y]
spix := src.Pixel[y]
spix := src.Pixel[sy]
for x, sx := x0, sp.X; x != x1; x, sx = x+1, sx+1 {
// For unknown reasons, even though both dpix[x] and spix[sx] are
// image.RGBAColors, on an x86 CPU it seems fastest to call RGBA

14
src/pkg/exp/draw/draw_test.go
View File

@ -149,3 +149,17 @@ loop:
}
}
}
// TestIssue836 verifies http://code.google.com/p/go/issues/detail?id=836.
func TestIssue836(t *testing.T) {
a := image.NewRGBA(1, 1)
b := image.NewRGBA(2, 2)
b.Set(0, 0, image.RGBAColor{0, 0, 0, 5})
b.Set(1, 0, image.RGBAColor{0, 0, 5, 5})
b.Set(0, 1, image.RGBAColor{0, 5, 0, 5})
b.Set(1, 1, image.RGBAColor{5, 0, 0, 5})
Draw(a, Rect(0, 0, 1, 1), b, Pt(1, 1))
if !eq(image.RGBAColor{5, 0, 0, 5}, a.At(0, 0)) {
t.Errorf("Issue 836: want %v got %v", image.RGBAColor{5, 0, 0, 5}, a.At(0, 0))
}
}