diff options
Diffstat (limited to 'weed/images/cropping.go')
| -rw-r--r-- | weed/images/cropping.go | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/weed/images/cropping.go b/weed/images/cropping.go new file mode 100644 index 000000000..07a3f41ad --- /dev/null +++ b/weed/images/cropping.go @@ -0,0 +1,47 @@ +package images
+
+import (
+ "bytes"
+ "image"
+ "image/gif"
+ "image/jpeg"
+ "image/png"
+ "io"
+
+ "github.com/disintegration/imaging"
+
+ "github.com/seaweedfs/seaweedfs/weed/glog"
+)
+
+func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error) {
+ srcImage, _, err := image.Decode(read)
+ if err != nil {
+ glog.Error(err)
+ return read, err
+ }
+
+ bounds := srcImage.Bounds()
+ if x2 > bounds.Dx() || y2 > bounds.Dy() {
+ read.Seek(0, 0)
+ return read, nil
+ }
+
+ rectangle := image.Rect(x1, y1, x2, y2)
+ dstImage := imaging.Crop(srcImage, rectangle)
+ var buf bytes.Buffer
+ switch ext {
+ case ".jpg", ".jpeg":
+ if err = jpeg.Encode(&buf, dstImage, nil); err != nil {
+ glog.Error(err)
+ }
+ case ".png":
+ if err = png.Encode(&buf, dstImage); err != nil {
+ glog.Error(err)
+ }
+ case ".gif":
+ if err = gif.Encode(&buf, dstImage, nil); err != nil {
+ glog.Error(err)
+ }
+ }
+ return bytes.NewReader(buf.Bytes()), err
+}
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