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image: add a test for filling sub-images.

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R=r
CC=golang-dev
https://golang.org/cl/4626091
This commit is contained in:
Nigel Tao 2011-07-05 14:42:31 +10:00
parent b177c97803
commit 104f57ad39
1 changed files with 60 additions and 0 deletions
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60
src/pkg/image/draw/draw_test.go
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@ -276,3 +276,63 @@ func TestNonZeroSrcPt(t *testing.T) {
t.Errorf("non-zero src pt: want %v got %v", image.RGBAColor{5, 0, 0, 5}, a.At(0, 0))
}
}
func TestFill(t *testing.T) {
rr := []image.Rectangle{
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 40, 30),
image.Rect(10, 0, 40, 30),
image.Rect(0, 20, 40, 30),
image.Rect(10, 20, 40, 30),
image.Rect(10, 20, 15, 25),
image.Rect(10, 0, 35, 30),
image.Rect(0, 15, 40, 16),
image.Rect(24, 24, 25, 25),
image.Rect(23, 23, 26, 26),
image.Rect(22, 22, 27, 27),
image.Rect(21, 21, 28, 28),
image.Rect(20, 20, 29, 29),
}
for _, r := range rr {
m := image.NewRGBA(40, 30).SubImage(r).(*image.RGBA)
b := m.Bounds()
c := image.RGBAColor{11, 0, 0, 255}
src := &image.ColorImage{c}
check := func(desc string) {
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
if !eq(c, m.At(x, y)) {
t.Errorf("%s fill: at (%d, %d), sub-image bounds=%v: want %v got %v", desc, x, y, r, c, m.At(x, y))
return
}
}
}
}
// Draw 1 pixel at a time.
for y := b.Min.Y; y < b.Max.Y; y++ {
for x := b.Min.X; x < b.Max.X; x++ {
DrawMask(m, image.Rect(x, y, x+1, y+1), src, image.ZP, nil, image.ZP, Src)
}
}
check("pixel")
// Draw 1 row at a time.
c = image.RGBAColor{0, 22, 0, 255}
src = &image.ColorImage{c}
for y := b.Min.Y; y < b.Max.Y; y++ {
DrawMask(m, image.Rect(b.Min.X, y, b.Max.X, y+1), src, image.ZP, nil, image.ZP, Src)
}
check("row")
// Draw 1 column at a time.
c = image.RGBAColor{0, 0, 33, 255}
src = &image.ColorImage{c}
for x := b.Min.X; x < b.Max.X; x++ {
DrawMask(m, image.Rect(x, b.Min.Y, x+1, b.Max.Y), src, image.ZP, nil, image.ZP, Src)
}
check("column")
// Draw the whole image at once.
c = image.RGBAColor{44, 55, 66, 77}
src = &image.ColorImage{c}
DrawMask(m, b, src, image.ZP, nil, image.ZP, Src)
check("whole")
}
}