diff options
Diffstat (limited to 'vendor/golang.org/x/image/vector/vector_test.go')
-rw-r--r-- | vendor/golang.org/x/image/vector/vector_test.go | 519 |
1 files changed, 0 insertions, 519 deletions
diff --git a/vendor/golang.org/x/image/vector/vector_test.go b/vendor/golang.org/x/image/vector/vector_test.go deleted file mode 100644 index 012968e02..000000000 --- a/vendor/golang.org/x/image/vector/vector_test.go +++ /dev/null @@ -1,519 +0,0 @@ -// Copyright 2016 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package vector - -// TODO: add tests for NaN and Inf coordinates. - -import ( - "fmt" - "image" - "image/color" - "image/draw" - "image/png" - "math" - "math/rand" - "os" - "path/filepath" - "testing" -) - -// encodePNG is useful for manually debugging the tests. -func encodePNG(dstFilename string, src image.Image) error { - f, err := os.Create(dstFilename) - if err != nil { - return err - } - encErr := png.Encode(f, src) - closeErr := f.Close() - if encErr != nil { - return encErr - } - return closeErr -} - -func pointOnCircle(center, radius, index, number int) (x, y float32) { - c := float64(center) - r := float64(radius) - i := float64(index) - n := float64(number) - return float32(c + r*(math.Cos(2*math.Pi*i/n))), - float32(c + r*(math.Sin(2*math.Pi*i/n))) -} - -func TestRasterizeOutOfBounds(t *testing.T) { - // Set this to a non-empty string such as "/tmp" to manually inspect the - // rasterization. - // - // If empty, this test simply checks that calling LineTo with points out of - // the rasterizer's bounds doesn't panic. - const tmpDir = "" - - const center, radius, n = 16, 20, 16 - var z Rasterizer - for i := 0; i < n; i++ { - for j := 1; j < n/2; j++ { - z.Reset(2*center, 2*center) - z.MoveTo(1*center, 1*center) - z.LineTo(pointOnCircle(center, radius, i+0, n)) - z.LineTo(pointOnCircle(center, radius, i+j, n)) - z.ClosePath() - - z.MoveTo(0*center, 0*center) - z.LineTo(0*center, 2*center) - z.LineTo(2*center, 2*center) - z.LineTo(2*center, 0*center) - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if tmpDir == "" { - continue - } - - filename := filepath.Join(tmpDir, fmt.Sprintf("out-%02d-%02d.png", i, j)) - if err := encodePNG(filename, dst); err != nil { - t.Error(err) - } - t.Logf("wrote %s", filename) - } - } -} - -func TestRasterizePolygon(t *testing.T) { - var z Rasterizer - for radius := 4; radius <= 256; radius *= 2 { - for n := 3; n <= 19; n += 4 { - z.Reset(2*radius, 2*radius) - z.MoveTo(float32(2*radius), float32(1*radius)) - for i := 1; i < n; i++ { - z.LineTo(pointOnCircle(radius, radius, i, n)) - } - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if err := checkCornersCenter(dst); err != nil { - t.Errorf("radius=%d, n=%d: %v", radius, n, err) - } - } - } -} - -func TestRasterizeAlmostAxisAligned(t *testing.T) { - z := NewRasterizer(8, 8) - z.MoveTo(2, 2) - z.LineTo(6, math.Nextafter32(2, 0)) - z.LineTo(6, 6) - z.LineTo(math.Nextafter32(2, 0), 6) - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if err := checkCornersCenter(dst); err != nil { - t.Error(err) - } -} - -func TestRasterizeWideAlmostHorizontalLines(t *testing.T) { - var z Rasterizer - for i := uint(3); i < 16; i++ { - x := float32(int(1 << i)) - - z.Reset(8, 8) - z.MoveTo(-x, 3) - z.LineTo(+x, 4) - z.LineTo(+x, 6) - z.LineTo(-x, 6) - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if err := checkCornersCenter(dst); err != nil { - t.Errorf("i=%d: %v", i, err) - } - } -} - -func TestRasterize30Degrees(t *testing.T) { - z := NewRasterizer(8, 8) - z.MoveTo(4, 4) - z.LineTo(8, 4) - z.LineTo(4, 6) - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if err := checkCornersCenter(dst); err != nil { - t.Error(err) - } -} - -func TestRasterizeRandomLineTos(t *testing.T) { - var z Rasterizer - for i := 5; i < 50; i++ { - n, rng := 0, rand.New(rand.NewSource(int64(i))) - - z.Reset(i+2, i+2) - z.MoveTo(float32(i/2), float32(i/2)) - for ; rng.Intn(16) != 0; n++ { - x := 1 + rng.Intn(i) - y := 1 + rng.Intn(i) - z.LineTo(float32(x), float32(y)) - } - z.ClosePath() - - dst := image.NewAlpha(z.Bounds()) - z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) - - if err := checkCorners(dst); err != nil { - t.Errorf("i=%d (%d nodes): %v", i, n, err) - } - } -} - -// checkCornersCenter checks that the corners of the image are all 0x00 and the -// center is 0xff. -func checkCornersCenter(m *image.Alpha) error { - if err := checkCorners(m); err != nil { - return err - } - size := m.Bounds().Size() - center := m.Pix[(size.Y/2)*m.Stride+(size.X/2)] - if center != 0xff { - return fmt.Errorf("center: got %#02x, want 0xff", center) - } - return nil -} - -// checkCorners checks that the corners of the image are all 0x00. -func checkCorners(m *image.Alpha) error { - size := m.Bounds().Size() - corners := [4]uint8{ - m.Pix[(0*size.Y+0)*m.Stride+(0*size.X+0)], - m.Pix[(0*size.Y+0)*m.Stride+(1*size.X-1)], - m.Pix[(1*size.Y-1)*m.Stride+(0*size.X+0)], - m.Pix[(1*size.Y-1)*m.Stride+(1*size.X-1)], - } - if corners != [4]uint8{} { - return fmt.Errorf("corners were not all zero: %v", corners) - } - return nil -} - -var basicMask = []byte{ - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe3, 0xaa, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfa, 0x5f, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x24, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xa1, 0x00, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x14, 0x00, 0x00, - 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x4a, 0x00, 0x00, - 0x00, 0x00, 0xcc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x81, 0x00, 0x00, - 0x00, 0x00, 0x66, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xe4, 0xff, 0xff, 0xff, 0xb6, 0x00, 0x00, - 0x00, 0x00, 0x0c, 0xf2, 0xff, 0xff, 0xfe, 0x9e, 0x15, 0x00, 0x15, 0x96, 0xff, 0xce, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x88, 0xfc, 0xe3, 0x43, 0x00, 0x00, 0x00, 0x00, 0x06, 0xcd, 0xdc, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x25, 0xde, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x56, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, -} - -func testBasicPath(t *testing.T, prefix string, dst draw.Image, src image.Image, op draw.Op, want []byte) { - z := NewRasterizer(16, 16) - z.MoveTo(2, 2) - z.LineTo(8, 2) - z.QuadTo(14, 2, 14, 14) - z.CubeTo(8, 2, 5, 20, 2, 8) - z.ClosePath() - - z.DrawOp = op - z.Draw(dst, z.Bounds(), src, image.Point{}) - - var got []byte - switch dst := dst.(type) { - case *image.Alpha: - got = dst.Pix - case *image.RGBA: - got = dst.Pix - default: - t.Errorf("%s: unrecognized dst image type %T", prefix, dst) - } - - if len(got) != len(want) { - t.Errorf("%s: len(got)=%d and len(want)=%d differ", prefix, len(got), len(want)) - return - } - for i := range got { - delta := int(got[i]) - int(want[i]) - // The +/- 2 allows different implementations to give different - // rounding errors. - if delta < -2 || +2 < delta { - t.Errorf("%s: i=%d: got %#02x, want %#02x", prefix, i, got[i], want[i]) - return - } - } -} - -func TestBasicPathDstAlpha(t *testing.T) { - for _, background := range []uint8{0x00, 0x80} { - for _, op := range []draw.Op{draw.Over, draw.Src} { - for _, xPadding := range []int{0, 7} { - bounds := image.Rect(0, 0, 16+xPadding, 16) - dst := image.NewAlpha(bounds) - for i := range dst.Pix { - dst.Pix[i] = background - } - - want := make([]byte, len(dst.Pix)) - copy(want, dst.Pix) - - if op == draw.Over && background == 0x80 { - for y := 0; y < 16; y++ { - for x := 0; x < 16; x++ { - ma := basicMask[16*y+x] - i := dst.PixOffset(x, y) - want[i] = 0xff - (0xff-ma)/2 - } - } - } else { - for y := 0; y < 16; y++ { - for x := 0; x < 16; x++ { - ma := basicMask[16*y+x] - i := dst.PixOffset(x, y) - want[i] = ma - } - } - } - - prefix := fmt.Sprintf("background=%#02x, op=%v, xPadding=%d", background, op, xPadding) - testBasicPath(t, prefix, dst, image.Opaque, op, want) - } - } - } -} - -func TestBasicPathDstRGBA(t *testing.T) { - blue := image.NewUniform(color.RGBA{0x00, 0x00, 0xff, 0xff}) - - for _, op := range []draw.Op{draw.Over, draw.Src} { - for _, xPadding := range []int{0, 7} { - bounds := image.Rect(0, 0, 16+xPadding, 16) - dst := image.NewRGBA(bounds) - for y := bounds.Min.Y; y < bounds.Max.Y; y++ { - for x := bounds.Min.X; x < bounds.Max.X; x++ { - dst.SetRGBA(x, y, color.RGBA{ - R: uint8(y * 0x07), - G: uint8(x * 0x05), - B: 0x00, - A: 0x80, - }) - } - } - - want := make([]byte, len(dst.Pix)) - copy(want, dst.Pix) - - if op == draw.Over { - for y := 0; y < 16; y++ { - for x := 0; x < 16; x++ { - ma := basicMask[16*y+x] - i := dst.PixOffset(x, y) - want[i+0] = uint8((uint32(0xff-ma) * uint32(y*0x07)) / 0xff) - want[i+1] = uint8((uint32(0xff-ma) * uint32(x*0x05)) / 0xff) - want[i+2] = ma - want[i+3] = ma/2 + 0x80 - } - } - } else { - for y := 0; y < 16; y++ { - for x := 0; x < 16; x++ { - ma := basicMask[16*y+x] - i := dst.PixOffset(x, y) - want[i+0] = 0x00 - want[i+1] = 0x00 - want[i+2] = ma - want[i+3] = ma - } - } - } - - prefix := fmt.Sprintf("op=%v, xPadding=%d", op, xPadding) - testBasicPath(t, prefix, dst, blue, op, want) - } - } -} - -const ( - benchmarkGlyphWidth = 893 - benchmarkGlyphHeight = 1122 -) - -type benchmarkGlyphDatum struct { - // n being 0, 1 or 2 means moveTo, lineTo or quadTo. - n uint32 - px float32 - py float32 - qx float32 - qy float32 -} - -// benchmarkGlyphData is the 'a' glyph from the Roboto Regular font, translated -// so that its top left corner is (0, 0). -var benchmarkGlyphData = []benchmarkGlyphDatum{ - {0, 699, 1102, 0, 0}, - {2, 683, 1070, 673, 988}, - {2, 544, 1122, 365, 1122}, - {2, 205, 1122, 102.5, 1031.5}, - {2, 0, 941, 0, 802}, - {2, 0, 633, 128.5, 539.5}, - {2, 257, 446, 490, 446}, - {1, 670, 446, 0, 0}, - {1, 670, 361, 0, 0}, - {2, 670, 264, 612, 206.5}, - {2, 554, 149, 441, 149}, - {2, 342, 149, 275, 199}, - {2, 208, 249, 208, 320}, - {1, 22, 320, 0, 0}, - {2, 22, 239, 79.5, 163.5}, - {2, 137, 88, 235.5, 44}, - {2, 334, 0, 452, 0}, - {2, 639, 0, 745, 93.5}, - {2, 851, 187, 855, 351}, - {1, 855, 849, 0, 0}, - {2, 855, 998, 893, 1086}, - {1, 893, 1102, 0, 0}, - {1, 699, 1102, 0, 0}, - {0, 392, 961, 0, 0}, - {2, 479, 961, 557, 916}, - {2, 635, 871, 670, 799}, - {1, 670, 577, 0, 0}, - {1, 525, 577, 0, 0}, - {2, 185, 577, 185, 776}, - {2, 185, 863, 243, 912}, - {2, 301, 961, 392, 961}, -} - -func scaledBenchmarkGlyphData(height int) (width int, data []benchmarkGlyphDatum) { - scale := float32(height) / benchmarkGlyphHeight - - // Clone the benchmarkGlyphData slice and scale its coordinates. - data = append(data, benchmarkGlyphData...) - for i := range data { - data[i].px *= scale - data[i].py *= scale - data[i].qx *= scale - data[i].qy *= scale - } - - return int(math.Ceil(float64(benchmarkGlyphWidth * scale))), data -} - -// benchGlyph benchmarks rasterizing a TrueType glyph. -// -// Note that, compared to the github.com/google/font-go prototype, the height -// here is the height of the bounding box, not the pixels per em used to scale -// a glyph's vectors. A height of 64 corresponds to a ppem greater than 64. -func benchGlyph(b *testing.B, colorModel byte, loose bool, height int, op draw.Op) { - width, data := scaledBenchmarkGlyphData(height) - z := NewRasterizer(width, height) - - bounds := z.Bounds() - if loose { - bounds.Max.X++ - } - dst, src := draw.Image(nil), image.Image(nil) - switch colorModel { - case 'A': - dst = image.NewAlpha(bounds) - src = image.Opaque - case 'N': - dst = image.NewNRGBA(bounds) - src = image.NewUniform(color.NRGBA{0x40, 0x80, 0xc0, 0xff}) - case 'R': - dst = image.NewRGBA(bounds) - src = image.NewUniform(color.RGBA{0x40, 0x80, 0xc0, 0xff}) - default: - b.Fatal("unsupported color model") - } - bounds = z.Bounds() - - b.ResetTimer() - for i := 0; i < b.N; i++ { - z.Reset(width, height) - z.DrawOp = op - for _, d := range data { - switch d.n { - case 0: - z.MoveTo(d.px, d.py) - case 1: - z.LineTo(d.px, d.py) - case 2: - z.QuadTo(d.px, d.py, d.qx, d.qy) - } - } - z.Draw(dst, bounds, src, image.Point{}) - } -} - -// The heights 16, 32, 64, 128, 256, 1024 include numbers both above and below -// the floatingPointMathThreshold constant (512). - -func BenchmarkGlyphAlpha16Over(b *testing.B) { benchGlyph(b, 'A', false, 16, draw.Over) } -func BenchmarkGlyphAlpha16Src(b *testing.B) { benchGlyph(b, 'A', false, 16, draw.Src) } -func BenchmarkGlyphAlpha32Over(b *testing.B) { benchGlyph(b, 'A', false, 32, draw.Over) } -func BenchmarkGlyphAlpha32Src(b *testing.B) { benchGlyph(b, 'A', false, 32, draw.Src) } -func BenchmarkGlyphAlpha64Over(b *testing.B) { benchGlyph(b, 'A', false, 64, draw.Over) } -func BenchmarkGlyphAlpha64Src(b *testing.B) { benchGlyph(b, 'A', false, 64, draw.Src) } -func BenchmarkGlyphAlpha128Over(b *testing.B) { benchGlyph(b, 'A', false, 128, draw.Over) } -func BenchmarkGlyphAlpha128Src(b *testing.B) { benchGlyph(b, 'A', false, 128, draw.Src) } -func BenchmarkGlyphAlpha256Over(b *testing.B) { benchGlyph(b, 'A', false, 256, draw.Over) } -func BenchmarkGlyphAlpha256Src(b *testing.B) { benchGlyph(b, 'A', false, 256, draw.Src) } -func BenchmarkGlyphAlpha1024Over(b *testing.B) { benchGlyph(b, 'A', false, 1024, draw.Over) } -func BenchmarkGlyphAlpha1024Src(b *testing.B) { benchGlyph(b, 'A', false, 1024, draw.Src) } - -func BenchmarkGlyphAlphaLoose16Over(b *testing.B) { benchGlyph(b, 'A', true, 16, draw.Over) } -func BenchmarkGlyphAlphaLoose16Src(b *testing.B) { benchGlyph(b, 'A', true, 16, draw.Src) } -func BenchmarkGlyphAlphaLoose32Over(b *testing.B) { benchGlyph(b, 'A', true, 32, draw.Over) } -func BenchmarkGlyphAlphaLoose32Src(b *testing.B) { benchGlyph(b, 'A', true, 32, draw.Src) } -func BenchmarkGlyphAlphaLoose64Over(b *testing.B) { benchGlyph(b, 'A', true, 64, draw.Over) } -func BenchmarkGlyphAlphaLoose64Src(b *testing.B) { benchGlyph(b, 'A', true, 64, draw.Src) } -func BenchmarkGlyphAlphaLoose128Over(b *testing.B) { benchGlyph(b, 'A', true, 128, draw.Over) } -func BenchmarkGlyphAlphaLoose128Src(b *testing.B) { benchGlyph(b, 'A', true, 128, draw.Src) } -func BenchmarkGlyphAlphaLoose256Over(b *testing.B) { benchGlyph(b, 'A', true, 256, draw.Over) } -func BenchmarkGlyphAlphaLoose256Src(b *testing.B) { benchGlyph(b, 'A', true, 256, draw.Src) } -func BenchmarkGlyphAlphaLoose1024Over(b *testing.B) { benchGlyph(b, 'A', true, 1024, draw.Over) } -func BenchmarkGlyphAlphaLoose1024Src(b *testing.B) { benchGlyph(b, 'A', true, 1024, draw.Src) } - -func BenchmarkGlyphRGBA16Over(b *testing.B) { benchGlyph(b, 'R', false, 16, draw.Over) } -func BenchmarkGlyphRGBA16Src(b *testing.B) { benchGlyph(b, 'R', false, 16, draw.Src) } -func BenchmarkGlyphRGBA32Over(b *testing.B) { benchGlyph(b, 'R', false, 32, draw.Over) } -func BenchmarkGlyphRGBA32Src(b *testing.B) { benchGlyph(b, 'R', false, 32, draw.Src) } -func BenchmarkGlyphRGBA64Over(b *testing.B) { benchGlyph(b, 'R', false, 64, draw.Over) } -func BenchmarkGlyphRGBA64Src(b *testing.B) { benchGlyph(b, 'R', false, 64, draw.Src) } -func BenchmarkGlyphRGBA128Over(b *testing.B) { benchGlyph(b, 'R', false, 128, draw.Over) } -func BenchmarkGlyphRGBA128Src(b *testing.B) { benchGlyph(b, 'R', false, 128, draw.Src) } -func BenchmarkGlyphRGBA256Over(b *testing.B) { benchGlyph(b, 'R', false, 256, draw.Over) } -func BenchmarkGlyphRGBA256Src(b *testing.B) { benchGlyph(b, 'R', false, 256, draw.Src) } -func BenchmarkGlyphRGBA1024Over(b *testing.B) { benchGlyph(b, 'R', false, 1024, draw.Over) } -func BenchmarkGlyphRGBA1024Src(b *testing.B) { benchGlyph(b, 'R', false, 1024, draw.Src) } - -func BenchmarkGlyphNRGBA16Over(b *testing.B) { benchGlyph(b, 'N', false, 16, draw.Over) } -func BenchmarkGlyphNRGBA16Src(b *testing.B) { benchGlyph(b, 'N', false, 16, draw.Src) } -func BenchmarkGlyphNRGBA32Over(b *testing.B) { benchGlyph(b, 'N', false, 32, draw.Over) } -func BenchmarkGlyphNRGBA32Src(b *testing.B) { benchGlyph(b, 'N', false, 32, draw.Src) } -func BenchmarkGlyphNRGBA64Over(b *testing.B) { benchGlyph(b, 'N', false, 64, draw.Over) } -func BenchmarkGlyphNRGBA64Src(b *testing.B) { benchGlyph(b, 'N', false, 64, draw.Src) } -func BenchmarkGlyphNRGBA128Over(b *testing.B) { benchGlyph(b, 'N', false, 128, draw.Over) } -func BenchmarkGlyphNRGBA128Src(b *testing.B) { benchGlyph(b, 'N', false, 128, draw.Src) } -func BenchmarkGlyphNRGBA256Over(b *testing.B) { benchGlyph(b, 'N', false, 256, draw.Over) } -func BenchmarkGlyphNRGBA256Src(b *testing.B) { benchGlyph(b, 'N', false, 256, draw.Src) } -func BenchmarkGlyphNRGBA1024Over(b *testing.B) { benchGlyph(b, 'N', false, 1024, draw.Over) } -func BenchmarkGlyphNRGBA1024Src(b *testing.B) { benchGlyph(b, 'N', false, 1024, draw.Src) } |