本文整理匯總了Golang中image.Gray16.Set方法的典型用法代碼示例。如果您正苦於以下問題：Golang Gray16.Set方法的具體用法？Golang Gray16.Set怎麽用？Golang Gray16.Set使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類image.Gray16的用法示例。
在下文中一共展示了Gray16.Set方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: idatReader
func (d *decoder) idatReader(idat io.Reader) (image.Image, os.Error) {
r, err := zlib.NewReader(idat)
if err != nil {
return nil, err
}
defer r.Close()
bpp := 0 // Bytes per pixel.
maxPalette := uint8(0)
var (
gray *image.Gray
rgba *image.RGBA
paletted *image.Paletted
nrgba *image.NRGBA
gray16 *image.Gray16
rgba64 *image.RGBA64
nrgba64 *image.NRGBA64
img image.Image
)
switch d.cb {
case cbG8:
bpp = 1
gray = image.NewGray(d.width, d.height)
img = gray
case cbTC8:
bpp = 3
rgba = image.NewRGBA(d.width, d.height)
img = rgba
case cbP8:
bpp = 1
paletted = image.NewPaletted(d.width, d.height, d.palette)
img = paletted
maxPalette = uint8(len(d.palette) - 1)
case cbTCA8:
bpp = 4
nrgba = image.NewNRGBA(d.width, d.height)
img = nrgba
case cbG16:
bpp = 2
gray16 = image.NewGray16(d.width, d.height)
img = gray16
case cbTC16:
bpp = 6
rgba64 = image.NewRGBA64(d.width, d.height)
img = rgba64
case cbTCA16:
bpp = 8
nrgba64 = image.NewNRGBA64(d.width, d.height)
img = nrgba64
}
// cr and pr are the bytes for the current and previous row.
// The +1 is for the per-row filter type, which is at cr[0].
cr := make([]uint8, 1+bpp*d.width)
pr := make([]uint8, 1+bpp*d.width)
for y := 0; y < d.height; y++ {
// Read the decompressed bytes.
_, err := io.ReadFull(r, cr)
if err != nil {
return nil, err
}
// Apply the filter.
cdat := cr[1:]
pdat := pr[1:]
switch cr[0] {
case ftNone:
// No-op.
case ftSub:
for i := bpp; i < len(cdat); i++ {
cdat[i] += cdat[i-bpp]
}
case ftUp:
for i := 0; i < len(cdat); i++ {
cdat[i] += pdat[i]
}
case ftAverage:
for i := 0; i < bpp; i++ {
cdat[i] += pdat[i] / 2
}
for i := bpp; i < len(cdat); i++ {
cdat[i] += uint8((int(cdat[i-bpp]) + int(pdat[i])) / 2)
}
case ftPaeth:
for i := 0; i < bpp; i++ {
cdat[i] += paeth(0, pdat[i], 0)
}
for i := bpp; i < len(cdat); i++ {
cdat[i] += paeth(cdat[i-bpp], pdat[i], pdat[i-bpp])
}
default:
return nil, FormatError("bad filter type")
}
// Convert from bytes to colors.
switch d.cb {
case cbG8:
for x := 0; x < d.width; x++ {
gray.Set(x, y, image.GrayColor{cdat[x]})
}
case cbTC8:
//.........這裏部分代碼省略.........
示例2: idatReader
//.........這裏部分代碼省略.........
// No-op.
case ftSub:
for i := bytesPerPixel; i < len(cdat); i++ {
cdat[i] += cdat[i-bytesPerPixel]
}
case ftUp:
for i := 0; i < len(cdat); i++ {
cdat[i] += pdat[i]
}
case ftAverage:
for i := 0; i < bytesPerPixel; i++ {
cdat[i] += pdat[i] / 2
}
for i := bytesPerPixel; i < len(cdat); i++ {
cdat[i] += uint8((int(cdat[i-bytesPerPixel]) + int(pdat[i])) / 2)
}
case ftPaeth:
for i := 0; i < bytesPerPixel; i++ {
cdat[i] += paeth(0, pdat[i], 0)
}
for i := bytesPerPixel; i < len(cdat); i++ {
cdat[i] += paeth(cdat[i-bytesPerPixel], pdat[i], pdat[i-bytesPerPixel])
}
default:
return nil, FormatError("bad filter type")
}
// Convert from bytes to colors.
switch d.cb {
case cbG1:
for x := 0; x < d.width; x += 8 {
b := cdat[x/8]
for x2 := 0; x2 < 8 && x+x2 < d.width; x2++ {
gray.Set(x+x2, y, image.GrayColor{(b >> 7) * 0xff})
b <<= 1
}
}
case cbG2:
for x := 0; x < d.width; x += 4 {
b := cdat[x/4]
for x2 := 0; x2 < 4 && x+x2 < d.width; x2++ {
gray.Set(x+x2, y, image.GrayColor{(b >> 6) * 0x55})
b <<= 2
}
}
case cbG4:
for x := 0; x < d.width; x += 2 {
b := cdat[x/2]
for x2 := 0; x2 < 2 && x+x2 < d.width; x2++ {
gray.Set(x+x2, y, image.GrayColor{(b >> 4) * 0x11})
b <<= 4
}
}
case cbG8:
for x := 0; x < d.width; x++ {
gray.Set(x, y, image.GrayColor{cdat[x]})
}
case cbGA8:
for x := 0; x < d.width; x++ {
ycol := cdat[2*x+0]
nrgba.Set(x, y, image.NRGBAColor{ycol, ycol, ycol, cdat[2*x+1]})
}
case cbTC8:
for x := 0; x < d.width; x++ {
rgba.Set(x, y, image.RGBAColor{cdat[3*x+0], cdat[3*x+1], cdat[3*x+2], 0xff})
}