feat: 添加图片缩放功能，优化图片加载逻辑

service/xibao/image_gen.go

@@ -195,9 +195,10 @@ func GenerateCongratulationImageNew(textOrImg qq_message.QQMessage, inputFile, o
 			log.Print("无法下载图片:", err)
 			return
 		}
-		im, _, err := sprite.LoadImageFile(filePath)
+		//缩放图片
+		im, _, err := util.ResizeImageByMaxHeightAndWidth2Image(filePath, uint(backgroundImageSprite.GetCurrentImage().Bounds().Dy())/2, uint(backgroundImageSprite.GetCurrentImage().Bounds().Dx())/4*3)
 		if err != nil {
-			log.Print("无法加载图片:", err)
+			log.Print("无法缩放图片:", err)
 			return
 		}
 		imgSprite := sprite.Sprite{

util/picture.go

@@ -10,6 +10,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"git.lxtend.com/lixiangwuxian/imagedd/sprite"
 	"github.com/nfnt/resize"
 )
 
@@ -182,40 +183,50 @@ func ResizeImageByMaxHeight2Image(imagePath string, maxHeight uint) (output []im
 		return nil, nil, err
 	}
 	defer file.Close()
+	img, delay, err := sprite.LoadImageFile(imagePath)
 
-	// 解码图片
+	if err != nil {
-	var img image.Image
+		return nil, nil, err
-	var decodeErr error
-
-	var gifImg *gif.GIF
-
-	ext := strings.ToLower(filepath.Ext(imagePath))
-	switch ext {
-	case ".jpg", ".jpeg":
-		img, decodeErr = jpeg.Decode(file)
-	case ".png":
-		img, decodeErr = png.Decode(file)
-	case ".gif":
-		gifImg, decodeErr = gif.DecodeAll(file)
-	default:
-		return nil, nil, errors.New("unsupported image format")
-	}
-
-	if decodeErr != nil {
-		return nil, nil, decodeErr
 	}
 
 	// 计算缩放后的尺寸，保持宽高比
 	// 传入0作为宽度，resize包会自动计算等比例的宽度
 	var resized []image.Image
-	if gifImg == nil {
+	if len(img) == 1 {
-		resized = []image.Image{resize.Resize(0, maxHeight, img, resize.Lanczos3)}
+		resized = []image.Image{resize.Resize(0, maxHeight, img[0], resize.Lanczos3)}
 	} else {
-		for _, frame := range gifImg.Image {
+		for _, frame := range img {
 			img := resize.Resize(0, maxHeight, frame, resize.Lanczos3)
 			resized = append(resized, img)
 		}
-		delay = gifImg.Delay
+	}
+	return resized, delay, nil
+}
+
+func ResizeImageByMaxHeightAndWidth2Image(imagePath string, maxHeight uint, maxWidth uint) (output []image.Image, delay []int, err error) {
+	// 打开源图片文件
+	file, err := os.Open(imagePath)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer file.Close()
+	img, delay, err := sprite.LoadImageFile(imagePath)
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// 计算缩放后的尺寸，保持宽高比
+	// 传入0作为宽度，resize包会自动计算等比例的宽度
+	var resized []image.Image
+	if len(img) == 1 {
+		resized = []image.Image{resize.Resize(0, maxHeight, img[0], resize.Lanczos3)}
+	} else {
+		for _, frame := range img {
+			img := resize.Resize(0, maxHeight, frame, resize.Lanczos3)
+			img = resize.Resize(maxWidth, 0, img, resize.Lanczos3)
+			resized = append(resized, img)
+		}
 	}
 	return resized, delay, nil
 }