# package gif
`import "image/gif"`
gif包實現了gif文件的編碼器和解碼器。gif格式參見:[http://www.w3.org/Graphics/GIF/spec-gif89a.txt](http://www.w3.org/Graphics/GIF/spec-gif89a.txt)
## Index
* [type Options](#Options)
* [func Decode(r io.Reader) (image.Image, error)](#Decode)
* [func DecodeConfig(r io.Reader) (image.Config, error)](#DecodeConfig)
* [func Encode(w io.Writer, m image.Image, o \*Options) error](#Encode)
* [type GIF](#GIF)
* [func DecodeAll(r io.Reader) (\*GIF, error)](#DecodeAll)
* [func EncodeAll(w io.Writer, g \*GIF) error](#EncodeAll)
## type [Options](https://github.com/golang/go/blob/master/src/image/gif/writer.go#L246 "View Source")
```
type Options struct {
// NumColors是圖像中的最多顏色數,范圍[1, 256]
NumColors int
// Quantizer用于生成NumColors大小的調色板,為nil時默認使用palette.Plan9
Quantizer draw.Quantizer
// Drawer用于將圖像寫入期望的調色板格式的圖像,為nil時會使用draw.FloydSteinberg
Drawer draw.Drawer
}
```
Options是編碼參數。
## func [Decode](https://github.com/golang/go/blob/master/src/image/gif/reader.go#L414 "View Source")
```
func Decode(r io.Reader) (image.Image, error)
```
從文件流解碼并返回GIF文件中的第一幅圖像。
## func [DecodeConfig](https://github.com/golang/go/blob/master/src/image/gif/reader.go#L446 "View Source")
```
func DecodeConfig(r io.Reader) (image.Config, error)
```
返回GIF圖像的色彩模型和尺寸;函數不會解碼整個圖像文件。
## func [Encode](https://github.com/golang/go/blob/master/src/image/gif/writer.go#L291 "View Source")
```
func Encode(w io.Writer, m image.Image, o *Options) error
```
函數將圖像以GIF格式寫入w中。
## type [GIF](https://github.com/golang/go/blob/master/src/image/gif/reader.go#L423 "View Source")
```
type GIF struct {
Image []*image.Paletted // 連續的圖像
Delay []int // 每一幀延遲時間,單位是0.01s
LoopCount int // 總的循環時間
}
```
GIF類型代表可能保存在GIF文件里的多幅圖像。
### func [DecodeAll](https://github.com/golang/go/blob/master/src/image/gif/reader.go#L431 "View Source")
```
func DecodeAll(r io.Reader) (*GIF, error)
```
函數從r中讀取一個GIF格式文件;返回值中包含了連續的圖幀和時間信息。
### func [EncodeAll](https://github.com/golang/go/blob/master/src/image/gif/writer.go#L262 "View Source")
```
func EncodeAll(w io.Writer, g *GIF) error
```
函數將g中所有的圖像按指定的每幀延遲和累計循環時間寫入w中。
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