Stride int
	// Rect is the image's bounds.
	Rect Rectangle
}

func (p *NRGBA64) ColorModel() color.Model { return color.NRGBA64Model }

func (p *NRGBA64) Bounds() Rectangle { return p.Rect }

func (p *NRGBA64) At(x, y int) color.Color {
	return p.NRGBA64At(x, y)
}

func (p *NRGBA64) RGBA64At(x, y int) color.RGBA64 {
	r, g, b, a := p.NRGBA64At(x, y).RGBA()

	case cbG16:
		bitsPerPixel = 16
		if d.useTransparent {
			nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height))
			img = nrgba64
		} else {
			gray16 = image.NewGray16(image.Rect(0, 0, width, height))
			img = gray16
		}
	case cbGA16:
		bitsPerPixel = 32
		nrgba64 = image.NewNRGBA64(image.Rect(0, 0, width, height))
		img = nrgba64
	case cbTC16:
		bitsPerPixel = 48
		if d.useTransparent {

	b = uint32(c.B)
	b |= b << 8
	b *= uint32(c.A)
	b /= 0xff
	a = uint32(c.A)
	a |= a << 8
	return
}

// NRGBA64 represents a non-alpha-premultiplied 64-bit color,
// having 16 bits for each of red, green, blue and alpha.
type NRGBA64 struct {
	R, G, B, A uint16
}

func (c NRGBA64) RGBA() (r, g, b, a uint32) {
	r = uint32(c.R)
	r *= uint32(c.A)
	r /= 0xffff
	g = uint32(c.G)
	g *= uint32(c.A)

			for x := bounds.Min.X; x < bounds.Max.X; x++ {
				nrgba64 := png.At(x, y).(color.NRGBA64)
				switch filename {
				case "ftbwn0g16":
					fmt.Fprintf(w, "%04x ", nrgba64.R)
				default:
					if useTransparent {
						fmt.Fprintf(w, "%04x%04x%04x ", nrgba64.R, nrgba64.G, nrgba64.B)
					} else {
						fmt.Fprintf(w, "%04x%04x%04x%04x ", nrgba64.R, nrgba64.G, nrgba64.B, nrgba64.A)
					}
				}
			}
		case cpm != nil:

	"image/color.Alpha16": true,
	"image/color.Alpha":   true,
	"image/color.CMYK":    true,
	"image/color.Gray16":  true,
	"image/color.Gray":    true,
	"image/color.NRGBA64": true,
	"image/color.NRGBA":   true,
	"image/color.NYCbCrA": true,
	"image/color.RGBA64":  true,
	"image/color.RGBA":    true,
	"image/color.YCbCr":   true,
	"image.Point":         true,
	"image.Rectangle":     true,

	image func() image
}{
	{"rgba", func() image { return NewRGBA(Rect(0, 0, 10, 10)) }},
	{"rgba64", func() image { return NewRGBA64(Rect(0, 0, 10, 10)) }},
	{"nrgba", func() image { return NewNRGBA(Rect(0, 0, 10, 10)) }},
	{"nrgba64", func() image { return NewNRGBA64(Rect(0, 0, 10, 10)) }},
	{"alpha", func() image { return NewAlpha(Rect(0, 0, 10, 10)) }},
	{"alpha16", func() image { return NewAlpha16(Rect(0, 0, 10, 10)) }},

pkg image, method (*Gray16) SetRGBA64(int, int, color.RGBA64)
pkg image, method (*NRGBA) RGBA64At(int, int) color.RGBA64
pkg image, method (*NRGBA) SetRGBA64(int, int, color.RGBA64)
pkg image, method (*NRGBA64) RGBA64At(int, int) color.RGBA64
pkg image, method (*NRGBA64) SetRGBA64(int, int, color.RGBA64)
pkg image, method (*NYCbCrA) RGBA64At(int, int) color.RGBA64
pkg image, method (*Paletted) RGBA64At(int, int) color.RGBA64

		transparentGreen = color.NRGBA{0x00, 0xff, 0x00, 0x00}
		transparentRed   = color.NRGBA{0xff, 0x00, 0x00, 0x00}

		opaqueGray64        = color.NRGBA64{0x9999, 0x9999, 0x9999, 0xffff}
		transparentPurple64 = color.NRGBA64{0xfedc, 0x0000, 0x7654, 0x0000}
	)

	// dst and src are 1x3 images but the dr rectangle (and hence the overlap)

				s0 := src0.PixOffset(sp.X, sp.Y)
				drawCopySrc(
					dst0.Pix[d0:], dst0.Stride, r, src0.Pix[s0:], src0.Stride, sp, 4*r.Dx())
				return
			}
		}
	case *image.NRGBA64:
		if op == Src && mask == nil {
			if src0, ok := src.(*image.NRGBA64); ok {
				d0 := dst0.PixOffset(r.Min.X, r.Min.Y)
				s0 := src0.PixOffset(sp.X, sp.Y)
				drawCopySrc(
					dst0.Pix[d0:], dst0.Stride, r, src0.Pix[s0:], src0.Stride, sp, 8*r.Dx())

			}
		case cbTCA16:
			// Convert from image.Image (which is alpha-premultiplied) to PNG's non-alpha-premultiplied.
			for x := b.Min.X; x < b.Max.X; x++ {
				c := color.NRGBA64Model.Convert(m.At(x, y)).(color.NRGBA64)
				cr[0][i+0] = uint8(c.R >> 8)
				cr[0][i+1] = uint8(c.R)
				cr[0][i+2] = uint8(c.G >> 8)
				cr[0][i+3] = uint8(c.G)
				cr[0][i+4] = uint8(c.B >> 8)
				cr[0][i+5] = uint8(c.B)