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。

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
+}