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graphics: Add TestImageDrawTrianglesWithSubImage

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This commit is contained in:
Hajime Hoshi 2019-02-16 22:37:33 +09:00
parent a8b97c9755
commit 1c3113e763
1 changed files with 83 additions and 0 deletions
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83
image_test.go
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@ -1512,3 +1512,86 @@ func TestImageAlphaOnBlack(t *testing.T) {
t.Errorf("gray must be included in the results but not") t.Errorf("gray must be included in the results but not")
} }
} }
func TestImageDrawTrianglesWithSubImage(t *testing.T) {
const w, h = 16, 16
src, _ := NewImage(w, h, FilterDefault)
dst, _ := NewImage(w, h, FilterDefault)
pix := make([]byte, 4*w*h)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
if 4 <= i && i < 8 && 4 <= j && j < 8 {
pix[4*(i+j*w)] = 0xff
pix[4*(i+j*w)+1] = 0
pix[4*(i+j*w)+2] = 0
pix[4*(i+j*w)+3] = 0xff
} else {
pix[4*(i+j*w)] = 0
pix[4*(i+j*w)+1] = 0xff
pix[4*(i+j*w)+2] = 0
pix[4*(i+j*w)+3] = 0xff
}
}
}
src.ReplacePixels(pix)
vs := []Vertex{
{
DstX: 0,
DstY: 0,
SrcX: 0,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: w,
DstY: 0,
SrcX: w,
SrcY: 0,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: 0,
DstY: h,
SrcX: 0,
SrcY: h,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: w,
DstY: h,
SrcX: w,
SrcY: h,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
}
is := []uint16{0, 1, 2, 1, 2, 3}
op := &DrawTrianglesOptions{}
dst.DrawTriangles(vs, is, src.SubImage(image.Rect(4, 4, 8, 8)).(*Image), op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j).(color.RGBA)
var want color.RGBA
if 4 <= i && i < 8 && 4 <= j && j < 8 {
want = src.At(i, j).(color.RGBA)
}
if !sameColors(got, want, 1) {
t.Errorf("dst.At(%d, %d): got %v, want: %v", i, j, got, want)
}
}
}
}