feat: 添加查bl图命令以获取最新分数截图，并优化头像处理逻辑，使用新的图片缩放方法

util/picture.go

@@ -110,8 +110,8 @@ func ResizeImageByMaxWidth(imagePath string, maxWidth uint) (outputPath string,
 	}
 }
 
-// ResizeImageByMaxHeight 按最大高度缩放图片，保持宽高比
-func ResizeImageByMaxHeight(imagePath string, maxHeight uint) (outputPath string, err error) {
+// ResizeImageByMaxHeight2File 按最大高度缩放图片，保持宽高比
+func ResizeImageByMaxHeight2File(imagePath string, maxHeight uint) (outputPath string, err error) {
 	// 打开源图片文件
 	file, err := os.Open(imagePath)
 	if err != nil {
@@ -160,6 +160,39 @@ func ResizeImageByMaxHeight(imagePath string, maxHeight uint) (outputPath string
 	}
 }
 
+func ResizeImageByMaxHeight2Image(imagePath string, maxHeight uint) (output image.Image, err error) {
+	// 打开源图片文件
+	file, err := os.Open(imagePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	// 解码图片
+	var img image.Image
+	var decodeErr error
+
+	ext := strings.ToLower(filepath.Ext(imagePath))
+	switch ext {
+	case ".jpg", ".jpeg":
+		img, decodeErr = jpeg.Decode(file)
+	case ".png":
+		img, decodeErr = png.Decode(file)
+	default:
+		return nil, errors.New("unsupported image format")
+	}
+
+	if decodeErr != nil {
+		return 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
+	resized := resize.Resize(0, maxHeight, img, resize.Lanczos3)
+
+	return resized, nil
+}
+
 func GetResizedIamgePathByOrgPath(orgPath string) string {
 	ext := strings.ToLower(filepath.Ext(orgPath))
 	return strings.TrimSuffix(orgPath, ext) + "_resized" + ext