return image size when client image processing

go/images/preprocess.go

@@ -12,7 +12,7 @@ import (
 * Call this function on any file uploaded to weedfs
 * 
 */
-func MaybePreprocessImage(filename string, data []byte, width, height int) (resized []byte) {
+func MaybePreprocessImage(filename string, data []byte, width, height int) (resized []byte, w int, h int) {
 	ext := filepath.Ext(filename)
 	switch ext {
 	case ".png", ".gif":
@@ -21,5 +21,5 @@ func MaybePreprocessImage(filename string, data []byte, width, height int) (resi
 	  data = FixJpgOrientation(data)
 		return Resized(ext, data, width, height)
 	}
-	return data
+	return data, 0, 0
 }

go/images/resizing.go

@@ -9,18 +9,23 @@ import (
 	"image/png"
 )
 
-func Resized(ext string, data []byte, width, height int) (resized []byte) {
+func Resized(ext string, data []byte, width, height int) (resized []byte, w int, h int) {
 	if width == 0 && height == 0 {
-		return data
+		return data, 0, 0
 	}
 	if srcImage, _, err := image.Decode(bytes.NewReader(data)); err == nil {
 		bounds := srcImage.Bounds()
 		var dstImage *image.NRGBA
+		if bounds.Dx() > width && width != 0 || bounds.Dy() > height && height != 0 {
 			if width == height && bounds.Dx() != bounds.Dy() {
 				dstImage = imaging.Thumbnail(srcImage, width, height, imaging.Lanczos)
+				w, h = width, height
 			} else {
 				dstImage = imaging.Resize(srcImage, width, height, imaging.Lanczos)
 			}
+		}else{
+		  return data, bounds.Dx(), bounds.Dy()
+		}
 		var buf bytes.Buffer
 		switch ext {
 		case ".png":
@@ -30,7 +35,7 @@ func Resized(ext string, data []byte, width, height int) (resized []byte) {
 		case ".gif":
 			gif.Encode(&buf, dstImage, nil)
 		}
-		return buf.Bytes()
+		return buf.Bytes(), dstImage.Bounds().Dx(), dstImage.Bounds().Dy()
 	}
-	return data
+	return data, 0, 0
 }

go/weed/weed_server/volume_server_handlers.go

@@ -132,7 +132,7 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		if r.FormValue("height") != "" {
 			height, _ = strconv.Atoi(r.FormValue("height"))
 		}
-		n.Data = images.Resized(ext, n.Data, width, height)
+		n.Data, _, _ = images.Resized(ext, n.Data, width, height)
 	}
 
 	w.Header().Set("Accept-Ranges", "bytes")