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graphics: Add TestImageOutsideUpperLeft

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Hajime Hoshi 2017-12-16 01:19:59 +09:00
parent 4744b461df
commit 654a88c140
1 changed files with 28 additions and 0 deletions
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28
image_test.go
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@ -664,3 +664,31 @@ func TestImageOutside(t *testing.T) {
}
}
}
func TestImageOutsideUpperLeft(t *testing.T) {
src, _ := NewImage(4, 4, FilterNearest)
dst1, _ := NewImage(16, 16, FilterNearest)
dst2, _ := NewImage(16, 16, FilterNearest)
src.Fill(color.RGBA{0xff, 0, 0, 0xff})
op := &DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 4)
r := image.Rect(-4, -4, 8, 8)
op.SourceRect = &r
dst1.DrawImage(src, op)
op = &DrawImageOptions{}
op.GeoM.Translate(4, 4)
op.GeoM.Rotate(math.Pi / 4)
dst2.DrawImage(src, op)
for j := 0; j < 16; j++ {
for i := 0; i < 16; i++ {
got := color.RGBAModel.Convert(dst1.At(i, j)).(color.RGBA)
want := color.RGBAModel.Convert(dst2.At(i, j)).(color.RGBA)
if got != want {
t.Errorf("got: dst1.At(%d, %d): %#v, want: dst2.At(%d, %d): %#v", i, j, got, i, j, want)
}
}
}
}