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  • import "image/gif"

  • Overview

  • Index

概觀

包gif實(shí)現(xiàn)了一個(gè)GIF圖像解碼器和編碼器。

The GIF specification is at http://www.w3.org/Graphics/GIF/spec-gif89a.txt.

索引

  • Constants

  • func Decode(r io.Reader) (image.Image, error)

  • func DecodeConfig(r io.Reader) (image.Config, error)

  • func Encode(w io.Writer, m image.Image, o *Options) error

  • func EncodeAll(w io.Writer, g *GIF) error

  • type GIF

  • func DecodeAll(r io.Reader) (*GIF, error)

  • type Options

包文件

reader.go writer.go

常量

處置方法。

const (
        DisposalNone       = 0x01
        DisposalBackground = 0x02
        DisposalPrevious   = 0x03)

func Decode

func Decode(r io.Reader) (image.Image, error)

Decode從r中讀取GIF圖像并將第一個(gè)嵌入圖像作為圖像返回。圖像。

func DecodeConfig

func DecodeConfig(r io.Reader) (image.Config, error)

DecodeConfig返回GIF圖像的全局顏色模型和尺寸,而不用解碼整個(gè)圖像。

func Encode

func Encode(w io.Writer, m image.Image, o *Options) error

Encode將圖像m以GIF格式寫入w。

func EncodeAll

func EncodeAll(w io.Writer, g *GIF) error

EncodeAll將g中的圖像以GIF格式寫入w,給定的循環(huán)數(shù)和幀之間的延遲。

type GIF

GIF表示可能存儲(chǔ)在GIF文件中的多個(gè)圖像。

type GIF struct {
        Image     []*image.Paletted // The successive images.
        Delay     []int             // The successive delay times, one per frame, in 100ths of a second.
        LoopCount int               // The loop count.        // Disposal is the successive disposal methods, one per frame. For        // backwards compatibility, a nil Disposal is valid to pass to EncodeAll,        // and implies that each frame's disposal method is 0 (no disposal        // specified).
        Disposal []byte        // Config is the global color table (palette), width and height. A nil or        // empty-color.Palette Config.ColorModel means that each frame has its own        // color table and there is no global color table. Each frame's bounds must        // be within the rectangle defined by the two points (0, 0) and        // (Config.Width, Config.Height).        //        // For backwards compatibility, a zero-valued Config is valid to pass to        // EncodeAll, and implies that the overall GIF's width and height equals        // the first frame's bounds' Rectangle.Max point.
        Config image.Config        // BackgroundIndex is the background index in the global color table, for        // use with the DisposalBackground disposal method.
        BackgroundIndex byte}

func DecodeAll

func DecodeAll(r io.Reader) (*GIF, error)

DecodeAll從r讀取GIF圖像并返回連續(xù)的幀和時(shí)間信息。

type Options

Options是編碼參數(shù)。

type Options struct {        // NumColors is the maximum number of colors used in the image.        // It ranges from 1 to 256.
        NumColors int        // Quantizer is used to produce a palette with size NumColors.        // palette.Plan9 is used in place of a nil Quantizer.
        Quantizer draw.Quantizer        // Drawer is used to convert the source image to the desired palette.        // draw.FloydSteinberg is used in place of a nil Drawer.
        Drawer draw.Drawer}
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