func BenchmarkYCbCrToRGB(b *testing.B) {
	// YCbCrToRGB does saturating arithmetic.
	// Low, middle, and high values can take
	// different paths through the generated code.
	b.Run("0", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			sink8, sink8, sink8 = YCbCrToRGB(0, 0, 0)
		}
	})
	b.Run("128", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			sink8, sink8, sink8 = YCbCrToRGB(128, 128, 128)
		}
	})

			ci := (sy-src.Rect.Min.Y)*src.CStride + (sp.X - src.Rect.Min.X)
			for x := x0; x != x1; x, yi, ci = x+4, yi+1, ci+1 {

				// This is an inline version of image/color/ycbcr.go's func YCbCrToRGB.
				yy1 := int32(src.Y[yi]) * 0x10101
				cb1 := int32(src.Cb[ci]) - 128
				cr1 := int32(src.Cr[ci]) - 128

				// The bit twiddling below is equivalent to
				//
				// r := (yy1 + 91881*cr1) >> 16

	cr := 32768*r1 - 27440*g1 - 5328*b1 + 257<<15
	if uint32(cr)&0xff000000 == 0 {
		cr >>= 16
	} else {
		cr = ^(cr >> 31)
	}

	return uint8(yy), uint8(cb), uint8(cr)
}

// YCbCrToRGB converts a Y'CbCr triple to an RGB triple.
func YCbCrToRGB(y, cb, cr uint8) (uint8, uint8, uint8) {
	// The JFIF specification says:
	//	R = Y' + 1.40200*(Cr-128)
	//	G = Y' - 0.34414*(Cb-128) - 0.71414*(Cr-128)
	//	B = Y' + 1.77200*(Cb-128)

			dpix := dst.Pix[y*dst.Stride:]
			yi := (sy-src.Rect.Min.Y)*src.YStride + (sp.X - src.Rect.Min.X)
			%s

				// This is an inline version of image/color/ycbcr.go's func YCbCrToRGB.
				yy1 := int32(src.Y[yi]) * 0x10101
				cb1 := int32(src.Cb[ci]) - 128
				cr1 := int32(src.Cr[ci]) - 128

				// The bit twiddling below is equivalent to
				//
				// r := (yy1 + 91881*cr1) >> 16

		{"Transparent", Var, 0},
		{"White", Var, 0},
		{"YCbCr", Type, 0},
		{"YCbCr.Cb", Field, 0},
		{"YCbCr.Cr", Field, 0},
		{"YCbCr.Y", Field, 0},
		{"YCbCrModel", Var, 0},
		{"YCbCrToRGB", Func, 0},
	},
	"image/color/palette": {
		{"Plan9", Var, 2},
		{"WebSafe", Var, 2},
	},
	"image/draw": {
		{"(Op).Draw", Method, 2},
		{"Draw", Func, 0},
		{"DrawMask", Func, 0},

pkg image, var ZP Point
pkg image, var ZR Rectangle
pkg image/color, func ModelFunc(func(Color) Color) Model
pkg image/color, func RGBToYCbCr(uint8, uint8, uint8) (uint8, uint8, uint8)
pkg image/color, func YCbCrToRGB(uint8, uint8, uint8) (uint8, uint8, uint8)
pkg image/color, method (Alpha) RGBA() (uint32, uint32, uint32, uint32)
pkg image/color, method (Alpha16) RGBA() (uint32, uint32, uint32, uint32)