feat: 添加WebP支持，更新SaveToGif方法并新增SaveToWebp方法，更新依赖项以支持新功能。

.gitignore

@@ -1,4 +1,4 @@
 test.png
 .vscode/launch.json
 imagedd
-test.gif
+test.*

go.mod

@@ -13,6 +13,8 @@ require (
 )
 
 require (
+	github.com/HugoSmits86/nativewebp v1.2.0 // indirect
+	github.com/kettek/apng v0.0.0-20220823221153-ff692776a607 // indirect
 	golang.org/x/net v0.0.0-20211118161319-6a13c67c3ce4 // indirect
 	golang.org/x/text v0.25.0 // indirect
 )

go.sum

@@ -1,5 +1,9 @@
+github.com/HugoSmits86/nativewebp v1.2.0 h1:XJtXeTg7FsOi9VB1elQYZy3n6VjYLqofSr3gGRLUOp4=
+github.com/HugoSmits86/nativewebp v1.2.0/go.mod h1:YNQuWenlVmSUUASVNhTDwf4d7FwYQGbGhklC8p72Vr8=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/kettek/apng v0.0.0-20220823221153-ff692776a607 h1:8tP9cdXzcGX2AvweVVG/lxbI7BSjWbNNUustwJ9dQVA=
+github.com/kettek/apng v0.0.0-20220823221153-ff692776a607/go.mod h1:x78/VRQYKuCftMWS0uK5e+F5RJ7S4gSlESRWI0Prl6Q=
 github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c h1:km8GpoQut05eY3GiYWEedbTT0qnSxrCjsVbb7yKY1KE=
 github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c/go.mod h1:cNQ3dwVJtS5Hmnjxy6AgTPd0Inb3pW05ftPSX7NZO7Q=
 github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef h1:Ch6Q+AZUxDBCVqdkI8FSpFyZDtCVBc2VmejdNrm5rRQ=

main.go

@@ -146,7 +146,10 @@ func main() {
 		board.AddSprite(gifSprite)
 	}
 	board.SaveToPng("test.png")
-	if err := board.SaveToGIF("test.gif"); err != nil {
+	if err := board.SaveToGif("test.gif"); err != nil {
+		log.Fatal(err)
+	}
+	if err := board.SaveToWebp("test.webp"); err != nil {
 		log.Fatal(err)
 	}
 }

sprite/named_sprite_board.go

@@ -1,6 +1,7 @@
 package sprite
 
 import (
+	"errors"
 	"image"
 	"image/color/palette"
 	"image/draw"
@@ -9,6 +10,8 @@ import (
 	"log"
 	"os"
 	"sort"
+
+	"github.com/HugoSmits86/nativewebp"
 )
 
 // 设置为true启用调试日志
@@ -864,7 +867,7 @@ func (b *NamedSpriteBoard) SaveToPng(filename string) error {
 	return nil
 }
 
-func (b *NamedSpriteBoard) SaveToGIF(filename string) error {
+func (b *NamedSpriteBoard) SaveToGif(filename string) error {
 	// 获取动画帧
 	frames, delays := b.RenderToAnimatedImage()
 	if len(frames) == 0 {
@@ -921,3 +924,38 @@ func (b *NamedSpriteBoard) SaveToGIF(filename string) error {
 
 	return nil
 }
+
+func (b *NamedSpriteBoard) SaveToWebp(filename string) error {
+	frames, delays := b.RenderToAnimatedImage()
+	if len(frames) == 0 {
+		return errors.New("no frames to save")
+	}
+	images := make([]image.Image, len(frames))
+	for i, frame := range frames {
+		images[i] = frame
+	}
+	durations := make([]uint, len(delays))
+	for i, delay := range delays {
+		durations[i] = uint(delay)
+	}
+	disposals := make([]uint, len(delays))
+	for i := range disposals {
+		disposals[i] = 0
+	}
+	ani := nativewebp.Animation{
+		Images:          images,
+		Durations:       durations,
+		Disposals:       disposals,
+		LoopCount:       0,
+		BackgroundColor: 0xffffffff,
+	}
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	if err := nativewebp.EncodeAll(f, &ani, &nativewebp.Options{}); err != nil {
+		return err
+	}
+	return nil
+}