Ejemplo n.º 1
0
func TestAffineMask(t *testing.T) {
	f, err := os.Open("../../../testdata/testpattern.png")
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	srcOrig, _, err := image.Decode(f)
	if err != nil {
		t.Fatal(err)
	}
	b := srcOrig.Bounds()
	src := image.NewRGBA(b)
	draw.Draw(src, src.Rect, srcOrig, b.Min, draw.Src)
	mask := image.NewAlpha(b)
	for y := b.Min.Y; y < b.Max.Y; y++ {
		for x := b.Min.X; x < b.Max.X; x++ {
			mask.Set(x, y, color.Alpha{A: uint8(x - b.Min.X)})
		}
	}
	want := image.NewRGBA(b)
	draw.DrawMask(want, want.Rect, src, b.Min, mask, b.Min, draw.Src)

	a := new(f32.Affine)
	a.Identity()
	got := image.NewRGBA(b)
	affine(got, src, b, mask, a, draw.Src)

	if !imageEq(got, want) {
		gotPath, err := writeTempPNG("testpattern-mask-got", got)
		if err != nil {
			t.Fatal(err)
		}
		wantPath, err := writeTempPNG("testpattern-mask-want", want)
		if err != nil {
			t.Fatal(err)
		}
		t.Errorf("got\n%s\nwant\n%s", gotPath, wantPath)
	}
}
Ejemplo n.º 2
0
func TestAffine(t *testing.T) {
	f, err := os.Open("../../../testdata/testpattern.png")
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	srcOrig, _, err := image.Decode(f)
	if err != nil {
		t.Fatal(err)
	}
	src := image.NewRGBA(srcOrig.Bounds())
	draw.Draw(src, src.Rect, srcOrig, srcOrig.Bounds().Min, draw.Src)

	const (
		pixW = 100
		pixH = 100
		ptW  = geom.Pt(50)
		ptH  = geom.Pt(50)
	)
	sz := size.Event{
		WidthPx:     pixW,
		HeightPx:    pixH,
		WidthPt:     ptW,
		HeightPt:    ptH,
		PixelsPerPt: float32(pixW) / float32(ptW),
	}

	got := image.NewRGBA(image.Rect(0, 0, pixW, pixH))
	blue := image.NewUniform(color.RGBA{B: 0xff, A: 0xff})
	draw.Draw(got, got.Bounds(), blue, image.Point{}, draw.Src)

	b := src.Bounds()
	b.Min.X += 10
	b.Max.Y /= 2

	var a f32.Affine
	a.Identity()
	a.Scale(&a, sz.PixelsPerPt, sz.PixelsPerPt)
	a.Translate(&a, 0, 24)
	a.Rotate(&a, float32(math.Asin(12./20)))
	// See commentary in the render method defined in portable.go.
	a.Scale(&a, 40/float32(b.Dx()), 20/float32(b.Dy()))
	a.Inverse(&a)

	affine(got, src, b, nil, &a, draw.Over)

	ptTopLeft := geom.Point{0, 24}
	ptBottomRight := geom.Point{12 + 32, 16}

	drawCross(got, 0, 0)
	drawCross(got, int(ptTopLeft.X.Px(sz.PixelsPerPt)), int(ptTopLeft.Y.Px(sz.PixelsPerPt)))
	drawCross(got, int(ptBottomRight.X.Px(sz.PixelsPerPt)), int(ptBottomRight.Y.Px(sz.PixelsPerPt)))
	drawCross(got, pixW-1, pixH-1)

	const wantPath = "../../../testdata/testpattern-window.png"
	f, err = os.Open(wantPath)
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	wantSrc, _, err := image.Decode(f)
	if err != nil {
		t.Fatal(err)
	}
	want, ok := wantSrc.(*image.RGBA)
	if !ok {
		b := wantSrc.Bounds()
		want = image.NewRGBA(b)
		draw.Draw(want, b, wantSrc, b.Min, draw.Src)
	}

	if !imageEq(got, want) {
		gotPath, err := writeTempPNG("testpattern-window-got", got)
		if err != nil {
			t.Fatal(err)
		}
		t.Errorf("got\n%s\nwant\n%s", gotPath, wantPath)
	}
}