ActiveGo 1.8Package nycbcra
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Variables
ColorModel is the Model for non-alpha-premultiplied Y'CbCr-with-alpha colors.
var ColorModel color.Model = color.ModelFunc(nYCbCrAModel)
type Color ¶
Color represents a non-alpha-premultiplied Y'CbCr-with-alpha color, having 8 bits each for one luma, two chroma and one alpha component.
type Color struct {
color.YCbCr
A uint8
}
func (Color) RGBA ¶
func (c Color) RGBA() (r, g, b, a uint32)
type Image ¶
Image is an in-memory image of non-alpha-premultiplied Y'CbCr-with-alpha colors. A and AStride are analogous to the Y and YStride fields of the embedded YCbCr.
type Image struct {
image.YCbCr
A []uint8
AStride int
}
func New ¶
func New(r image.Rectangle, subsampleRatio image.YCbCrSubsampleRatio) *Image
New returns a new Image with the given bounds and subsample ratio.
func (*Image) AOffset ¶
func (p *Image) AOffset(x, y int) int
AOffset returns the index of the first element of A that corresponds to the pixel at (x, y).
func (*Image) At ¶
func (p *Image) At(x, y int) color.Color
func (*Image) ColorModel ¶
func (p *Image) ColorModel() color.Model
func (*Image) NYCbCrAAt ¶
func (p *Image) NYCbCrAAt(x, y int) Color
func (*Image) Opaque ¶
func (p *Image) Opaque() bool
Opaque scans the entire image and reports whether it is fully opaque.
func (*Image) SubImage ¶
func (p *Image) SubImage(r image.Rectangle) image.Image
SubImage returns an image representing the portion of the image p visible through r. The returned value shares pixels with the original image.