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shareable: Add TestReplacePixelsAfterDrawImage

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This commit is contained in:
Hajime Hoshi 2018-12-16 15:13:35 +09:00
parent 5f8a0e34bb
commit 2c25318634
1 changed files with 31 additions and 0 deletions
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31
internal/shareable/shareable_test.go
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@ -252,3 +252,34 @@ func TestExtend(t *testing.T) {
img0.Dispose()
img1.Dispose()
}
func TestReplacePixelsAfterDrawImage(t *testing.T) {
const w, h = 256, 256
src := NewImage(w, h)
dst := NewImage(w, h)
pix := make([]byte, 4*w*h)
for i := 0; i < w*h; i++ {
pix[4*i] = byte(i)
pix[4*i+1] = byte(i)
pix[4*i+2] = byte(i)
pix[4*i+3] = byte(i)
}
src.ReplacePixels(pix)
vs := src.QuadVertices(0, 0, w, h, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1)
is := graphics.QuadIndices()
dst.DrawImage(src, vs, is, nil, graphics.CompositeModeCopy, graphics.FilterNearest)
dst.ReplacePixels(pix)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j)
c := byte(i + w*j)
want := color.RGBA{c, c, c, c}
if got != want {
t.Errorf("dst.At(%d, %d): got %v, want: %v", i, j, got, want)
}
}
}
}