©
本文档使用
php中文网手册 发布
import "image/gif"
Overview
Index
包gif实现了一个GIF图像解码器和编码器。
The GIF specification is at http://www.w3.org/Graphics/GIF/spec-gif89a.txt.
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
reader.go writer.go
处置方法。
const ( DisposalNone = 0x01 DisposalBackground = 0x02 DisposalPrevious = 0x03)
func Decode(r io.Reader) (image.Image, error)
Decode从r中读取GIF图像并将第一个嵌入图像作为图像返回。图像。
func DecodeConfig(r io.Reader) (image.Config, error)
DecodeConfig返回GIF图像的全局颜色模型和尺寸，而不用解码整个图像。
func Encode(w io.Writer, m image.Image, o *Options) error
Encode将图像m以GIF格式写入w。
func EncodeAll(w io.Writer, g *GIF) error
EncodeAll将g中的图像以GIF格式写入w，给定的循环数和帧之间的延迟。
GIF表示可能存储在GIF文件中的多个图像。
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(r io.Reader) (*GIF, error)
DecodeAll从r读取GIF图像并返回连续的帧和时间信息。
Options是编码参数。
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}