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graphics: Add TestImageStretch (#611)

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This commit is contained in:
Hajime Hoshi 2018-05-13 23:47:59 +09:00
parent d7d892f2d6
commit b9cd7afff5
1 changed files with 37 additions and 0 deletions
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37
image_test.go
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@ -796,3 +796,40 @@ func TestImageCopy(t *testing.T) {
img1 := *img0 img1 := *img0
img1.Fill(color.Transparent) img1.Fill(color.Transparent)
} }
func TestImageStretch(t *testing.T) {
img0, _ := NewImage(16, 17, FilterDefault)
pix := make([]byte, 4*16*17)
for i := 0; i < 16*16; i++ {
pix[4*i] = 0xff
pix[4*i+3] = 0xff
}
for i := 0; i < 16; i++ {
pix[4*(16*16+i)+1] = 0xff
pix[4*(16*16+i)+3] = 0xff
}
img0.ReplacePixels(pix)
// TODO: 4096 doesn't pass on MacBook Pro (#611).
const h = 2048
img1, _ := NewImage(16, h, FilterDefault)
for i := 1; i < h; i++ {
img1.Clear()
op := &DrawImageOptions{}
op.GeoM.Scale(1, float64(i)/16)
r := image.Rect(0, 0, 16, 16)
op.SourceRect = &r
img1.DrawImage(img0, op)
for j := -1; j <= 1; j++ {
got := img1.At(0, i+j).(color.RGBA)
want := color.RGBA{}
if j < 0 {
want = color.RGBA{0xff, 0, 0, 0xff}
}
if got != want {
t.Errorf("At(%d, %d) (i=%d): got: %#v, want: %#v", 0, i+j, i, got, want)
}
}
}
}