feat: 添加GIF支持，更新SaveToGIF方法以使用WebSafe调色板，新增nailong.gif文件，更新main.go以处理GIF精灵。

.gitignore

@@ -1,2 +1,4 @@
 test.png
 .vscode/launch.json
+imagedd
+test.gif

main.go

@@ -1,9 +1,13 @@
 package main
 
 import (
+	"bytes"
 	"image"
 	"image/color"
+	"image/png"
 	"log"
+	"math"
+	"os"
 
 	"git.lxtend.com/lixiangwuxian/imagedd/sprite"
 	"git.lxtend.com/lixiangwuxian/imagedd/text2img"
@@ -56,25 +60,25 @@ func main() {
 		textSprite.AddFrame(img)
 		board.AddSprite(textSprite)
 	}
-	// {
-	// 	faceBytes, err := os.ReadFile("face.png")
-	// 	if err != nil {
-	// 		log.Fatal(err)
-	// 	}
-	// 	faceImage, err := png.Decode(bytes.NewReader(faceBytes))
-	// 	if err != nil {
-	// 		log.Fatal(err)
-	// 	}
-	// 	faceSprite := &sprite.Sprite{
-	// 		Name:         "face",
-	// 		Images:       []image.Image{faceImage},
-	// 		CurrentFrame: 0,
-	// 		Index:        1,
-	// 		Position:     image.Point{X: -100, Y: -100},
-	// 	}
-	// 	faceSprite.Rotate(math.Pi / 2)
-	// 	board.AddSprite(faceSprite)
-	// }
+	{
+		faceBytes, err := os.ReadFile("face.png")
+		if err != nil {
+			log.Fatal(err)
+		}
+		faceImage, err := png.Decode(bytes.NewReader(faceBytes))
+		if err != nil {
+			log.Fatal(err)
+		}
+		faceSprite := &sprite.Sprite{
+			Name:         "face",
+			Images:       []image.Image{faceImage},
+			CurrentFrame: 0,
+			Index:        1,
+			Position:     image.Point{X: -100, Y: -100},
+		}
+		faceSprite.Rotate(math.Pi / 2)
+		board.AddSprite(faceSprite)
+	}
 	{
 		rect := image.NewRGBA(image.Rect(0, 0, 101, 101))
 		rectSprite := &sprite.Sprite{
@@ -125,5 +129,24 @@ func main() {
 		}
 		board.AddSprite(circleSprite)
 	}
+	{
+		gifSprite := &sprite.Sprite{
+			Name:         "gif",
+			Images:       []image.Image{},
+			CurrentFrame: 0,
+			Index:        4,
+			Position:     image.Point{X: 40, Y: 20},
+		}
+		gifImage, delays, err := sprite.LoadImageFile("nailong.gif")
+		if err != nil {
+			log.Fatal(err)
+		}
+		gifSprite.SetFrames(gifImage)
+		gifSprite.Delay = delays
+		board.AddSprite(gifSprite)
+	}
 	board.SaveToPng("test.png")
+	if err := board.SaveToGIF("test.gif"); err != nil {
+		log.Fatal(err)
+	}
 }

sprite/named_sprite_board.go

@@ -2,6 +2,7 @@ package sprite
 
 import (
 	"image"
+	"image/color/palette"
 	"image/draw"
 	"image/gif"
 	"image/png"
@@ -877,9 +878,9 @@ func (b *NamedSpriteBoard) SaveToGIF(filename string) error {
 		}
 		defer f.Close()
 
-		// 将RGBA图像转换为Paletted图像
+		// 将RGBA图像转换为Paletted图像，使用WebSafe调色板
 		bounds := img.Bounds()
-		palettedImg := image.NewPaletted(bounds, nil)
+		palettedImg := image.NewPaletted(bounds, palette.WebSafe)
 		draw.Draw(palettedImg, bounds, img, bounds.Min, draw.Src)
 
 		// 将图像编码为GIF并写入文件
@@ -899,7 +900,7 @@ func (b *NamedSpriteBoard) SaveToGIF(filename string) error {
 	// 转换所有帧为Paletted图像
 	for i, frame := range frames {
 		bounds := frame.Bounds()
-		palettedFrames[i] = image.NewPaletted(bounds, nil)
+		palettedFrames[i] = image.NewPaletted(bounds, palette.WebSafe)
 		draw.Draw(palettedFrames[i], bounds, frame, bounds.Min, draw.Src)
 	}