seaweedfs/weed/images/cropping.go

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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
}