[feature] migrate to monorepo

backend/pkg/imageutil/processor.go

@@ -0,0 +1,59 @@
+package imageutil
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"io"
+
+	"github.com/chai2010/webp"
+)
+
+type ProcessOptions struct {
+	Lossless    bool
+	Quality     float32 // 0-100
+	Compression int     // 0-6
+}
+
+// DefaultOptions returns default processing options
+func DefaultOptions() ProcessOptions {
+	return ProcessOptions{
+		Lossless:    true,
+		Quality:     90,
+		Compression: 4,
+	}
+}
+
+// ProcessImage converts any supported image to WebP format
+func ProcessImage(input io.Reader, opts ProcessOptions) ([]byte, error) {
+	// Decode the original image
+	img, _, err := image.Decode(input)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode image: %w", err)
+	}
+
+	// Encode to WebP
+	var buf bytes.Buffer
+	if err := webp.Encode(&buf, img, &webp.Options{
+		Lossless: opts.Lossless,
+		Quality:  opts.Quality,
+		Exact:    true,
+	}); err != nil {
+		return nil, fmt.Errorf("failed to encode to WebP: %w", err)
+	}
+
+	return buf.Bytes(), nil
+}
+
+// IsImageFormat checks if the given format is a supported image format
+func IsImageFormat(contentType string) bool {
+	switch contentType {
+	case "image/jpeg", "image/png", "image/gif", "image/webp":
+		return true
+	default:
+		return false
+	}
+}