kiss2d 0.1.6

/*

// Copyright 2016 The Go Authors. All rights reserved.
// 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
}
*/

fn pointOnCircle(center: isize, radius: isize, index: isize, number: isize) -> (f32, f32) {
    use std::f64::consts::PI;
    let c = center as f64;
    let r = radius as f64;
    let i = index as f64;
    let n = number as f64;
    ((c + r * (2.*PI*i/n).cos()) as f32, (c + r * (2.*PI*i/n).sin()) as f32)
}

/*
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
}
*/

static BASIC_MASK: &[u8] = &[
    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 GLYPH_W: usize = 893;
const GLYPH_H: usize = 1122;

const MOVE_TO: u32 = 0;
const LINE_TO: u32 = 1;
const QUAD_TO: u32 = 2;

struct G {
    // n being 0, 1 or 2 means moveTo, lineTo or quadTo.
    n: u32,
    px: f32,
    py: f32,
    qx: f32,
    qy: f32,
}

impl G {
    const fn move_to(px: f32, py: f32) -> Self {
        Self { n: MOVE_TO, px, py, qx: 0.0, qy: 0.0 }
    }

    const fn line_to(px: f32, py: f32) -> Self {
        Self { n: LINE_TO, px, py, qx: 0.0, qy: 0.0 }
    }

    const fn quad_to(px: f32, py: f32, qx: f32, qy: f32) -> Self {
        Self { n: QUAD_TO, px, py, qx, qy }
    }
}

// benchmarkGlyphData is the 'a' glyph from the Roboto Regular font, translated
// so that its top left corner is (0, 0).
static GLYPH_DATA: &[G] = &[
    G::move_to(699., 1102.),
    G::quad_to(683., 1070., 673.,  988.),
    G::quad_to(544., 1122., 365., 1122.),
    G::quad_to(205., 1122., 102.5,1031.5),
    G::quad_to(  0.,  941.,   0. , 802.),
    G::quad_to(  0.,  633., 128.5, 539.5),
    G::quad_to(257.,  446., 490.,  446.),
    G::line_to(670.,  446.),
    G::line_to(670.,  361.),
    G::quad_to(670.,  264., 612., 206.5),
    G::quad_to(554.,  149., 441., 149.),
    G::quad_to(342.,  149., 275., 199.),
    G::quad_to(208.,  249., 208., 320.),
    G::line_to( 22.,  320.),
    G::quad_to( 22.,  239.,  79.5,163.5),
    G::quad_to(137.,   88., 235.5, 44.),
    G::quad_to(334.,    0., 452.,   0.),
    G::quad_to(639.,    0., 745.,  93.5),
    G::quad_to(851.,  187., 855., 351.),
    G::line_to(855.,  849.),
    G::quad_to(855.,  998., 893.,1086.),
    G::line_to(893., 1102.),
    G::line_to(699., 1102.),
    G::move_to(392.,  961.),
    G::quad_to(479.,  961., 557., 916.),
    G::quad_to(635.,  871., 670., 799.),
    G::line_to(670.,  577.),
    G::line_to(525.,  577.),
    G::quad_to(185.,  577., 185., 776.),
    G::quad_to(185.,  863., 243., 912.),
    G::quad_to(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
    }

    (((benchmarkGlyphWidth * scale) as f64).ceil() as isize, 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) }
*/