YCbCrSubsampleRatio422
	YCbCrSubsampleRatio420
	YCbCrSubsampleRatio440
	YCbCrSubsampleRatio411
	YCbCrSubsampleRatio410
)

func (s YCbCrSubsampleRatio) String() string {
	switch s {
	case YCbCrSubsampleRatio444:
		return "YCbCrSubsampleRatio444"
	case YCbCrSubsampleRatio422:
		return "YCbCrSubsampleRatio422"
	case YCbCrSubsampleRatio420:
		return "YCbCrSubsampleRatio420"
	case YCbCrSubsampleRatio440:

		Rect(7, 7, 17, 17),
		Rect(8, 8, 17, 17),
		Rect(9, 9, 17, 17),
		Rect(10, 10, 17, 17),
	}
	subsampleRatios := []YCbCrSubsampleRatio{
		YCbCrSubsampleRatio444,
		YCbCrSubsampleRatio422,
		YCbCrSubsampleRatio420,
		YCbCrSubsampleRatio440,
		YCbCrSubsampleRatio411,
		YCbCrSubsampleRatio410,
	}
	deltas := []Point{
		Pt(0, 0),
		Pt(1000, 1001),
		Pt(5001, -400),
		Pt(-701, -801),
	}

	options := &Options{Quality: 90}
	for i := 0; i < b.N; i++ {
		Encode(io.Discard, img, options)
	}
}

func BenchmarkEncodeYCbCr(b *testing.B) {
	img := image.NewYCbCr(image.Rect(0, 0, 640, 480), image.YCbCrSubsampleRatio420)
	bo := img.Bounds()
	rnd := rand.New(rand.NewSource(123))
	for y := bo.Min.Y; y < bo.Max.Y; y++ {
		for x := bo.Min.X; x < bo.Max.X; x++ {
			cy := img.YOffset(x, y)
			ci := img.COffset(x, y)

				rgba := dpix[x : x+4 : len(dpix)]
				rgba[0] = uint8(r)
				rgba[1] = uint8(g)
				rgba[2] = uint8(b)
				rgba[3] = 255
			}
		}

	case image.YCbCrSubsampleRatio420:
		for y, sy := y0, sp.Y; y != y1; y, sy = y+1, sy+1 {
			dpix := dst.Pix[y*dst.Stride:]
			yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X)

		subsampleRatio = image.YCbCrSubsampleRatio444
	case 0x12:
		subsampleRatio = image.YCbCrSubsampleRatio440
	case 0x21:
		subsampleRatio = image.YCbCrSubsampleRatio422
	case 0x22:
		subsampleRatio = image.YCbCrSubsampleRatio420
	case 0x41:
		subsampleRatio = image.YCbCrSubsampleRatio411
	case 0x42:
		subsampleRatio = image.YCbCrSubsampleRatio410
	default:
		panic("unreachable")
	}

		{"YCbCr.Y", Field, 0},
		{"YCbCr.YStride", Field, 0},
		{"YCbCrSubsampleRatio", Type, 0},
		{"YCbCrSubsampleRatio410", Const, 5},
		{"YCbCrSubsampleRatio411", Const, 5},
		{"YCbCrSubsampleRatio420", Const, 0},
		{"YCbCrSubsampleRatio422", Const, 0},
		{"YCbCrSubsampleRatio440", Const, 1},
		{"YCbCrSubsampleRatio444", Const, 0},
		{"ZP", Var, 0},
		{"ZR", Var, 0},
	},
	"image/color": {

pkg html/template, type HTMLAttr string
pkg html/template, type JS string
pkg html/template, type JSStr string
pkg html/template, type Template struct
pkg html/template, type URL string
pkg image, const YCbCrSubsampleRatio420 YCbCrSubsampleRatio
pkg image, const YCbCrSubsampleRatio422 YCbCrSubsampleRatio
pkg image, const YCbCrSubsampleRatio444 YCbCrSubsampleRatio
pkg image, func Decode(io.Reader) (Image, string, error)

pkg html/template, const ErrPartialEscape = 8
pkg html/template, const ErrRangeLoopReentry = 9
pkg html/template, const ErrSlashAmbig = 10
pkg html/template, const OK = 0
pkg image, const YCbCrSubsampleRatio420 = 2
pkg image, const YCbCrSubsampleRatio422 = 1
pkg image, const YCbCrSubsampleRatio440 = 3
pkg image, const YCbCrSubsampleRatio440 YCbCrSubsampleRatio
pkg image, const YCbCrSubsampleRatio444 = 0