type PalettedImage(interface)
PalettedImage is an image whose colors may come from a limited palette.
If m is a PalettedImage and m.ColorModel() returns a color.Palette p,
then m.At(x, y) should be equivalent to p[m.ColorIndexAt(x, y)]. If m's
color model is not a color.Palette, then ColorIndexAt's behavior is
undefined.
(T) At(x, y int) color.Color
(T) Bounds() Rectangle
(T) ColorIndexAt(x, y int) uint8
(T) ColorModel() color.Model
*Paletted
T : Image
type YCbCr(struct)
YCbCr is an in-memory image of Y'CbCr colors. There is one Y sample per
pixel, but each Cb and Cr sample can span one or more pixels.
YStride is the Y slice index delta between vertically adjacent pixels.
CStride is the Cb and Cr slice index delta between vertically adjacent pixels
that map to separate chroma samples.
It is not an absolute requirement, but YStride and len(Y) are typically
multiples of 8, and:
For 4:4:4, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/1.
For 4:2:2, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/2.
For 4:2:0, CStride == YStride/2 && len(Cb) == len(Cr) == len(Y)/4.
For 4:4:0, CStride == YStride/1 && len(Cb) == len(Cr) == len(Y)/2.
For 4:1:1, CStride == YStride/4 && len(Cb) == len(Cr) == len(Y)/4.
For 4:1:0, CStride == YStride/4 && len(Cb) == len(Cr) == len(Y)/8.
CStrideintCb[]uint8Cr[]uint8RectRectangleSubsampleRatioYCbCrSubsampleRatioY[]uint8YStrideint
(*T) At(x, y int) color.Color
(*T) Bounds() Rectangle
(*T) COffset(x, y int) int
(*T) ColorModel() color.Model
(*T) Opaque() bool
(*T) SubImage(r Rectangle) Image
(*T) YCbCrAt(x, y int) color.YCbCr
(*T) YOffset(x, y int) int
*T : Image
func NewYCbCr(r Rectangle, subsampleRatio YCbCrSubsampleRatio) *YCbCr
func image/internal/imageutil.DrawYCbCr(dst *RGBA, r Rectangle, src *YCbCr, sp Point) (ok bool)
var Black *Uniform
Black is an opaque black uniform image.
func Decode(r io.Reader) (Image, string, error)
Decode decodes an image that has been encoded in a registered format.
The string returned is the format name used during format registration.
Format registration is typically done by an init function in the codec-
specific package.
func DecodeConfig(r io.Reader) (Config, string, error)
DecodeConfig decodes the color model and dimensions of an image that has
been encoded in a registered format. The string returned is the format name
used during format registration. Format registration is typically done by
an init function in the codec-specific package.
var ErrFormaterror
ErrFormat indicates that decoding encountered an unknown format.
func NewAlpha(r Rectangle) *Alpha
NewAlpha returns a new Alpha image with the given bounds.
var Opaque *Uniform
Opaque is a fully opaque uniform image.
func Pt(X, Y int) Point
Pt is shorthand for Point{X, Y}.
func Rect(x0, y0, x1, y1 int) Rectangle
Rect is shorthand for Rectangle{Pt(x0, y0), Pt(x1, y1)}. The returned
rectangle has minimum and maximum coordinates swapped if necessary so that
it is well-formed.
func RegisterFormat(name, magic string, decode func(io.Reader) (Image, error), decodeConfig func(io.Reader) (Config, error))
RegisterFormat registers an image format for use by Decode.
Name is the name of the format, like "jpeg" or "png".
Magic is the magic prefix that identifies the format's encoding. The magic
string can contain "?" wildcards that each match any one byte.
Decode is the function that decodes the encoded image.
DecodeConfig is the function that decodes just its configuration.
var Transparent *Uniform
Transparent is a fully transparent uniform image.
var White *Uniform
White is an opaque white uniform image.
var ZPPoint
ZP is the zero Point.
Deprecated: Use a literal image.Point{} instead.
var ZRRectangle
ZR is the zero Rectangle.
Deprecated: Use a literal image.Rectangle{} instead.
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Golds is a Go 101 project and developed by Tapir Liu.
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