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47 lines
946 B
47 lines
946 B
package images
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import (
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"bytes"
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"image"
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"image/gif"
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"image/jpeg"
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"image/png"
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"io"
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"github.com/disintegration/imaging"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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)
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func Cropped(ext string, read io.ReadSeeker, x1, y1, x2, y2 int) (cropped io.ReadSeeker, err error) {
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srcImage, _, err := image.Decode(read)
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if err != nil {
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glog.Error(err)
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return read, err
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}
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bounds := srcImage.Bounds()
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if x2 > bounds.Dx() || y2 > bounds.Dy() {
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read.Seek(0, 0)
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return read, nil
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}
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rectangle := image.Rect(x1, y1, x2, y2)
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dstImage := imaging.Crop(srcImage, rectangle)
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var buf bytes.Buffer
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switch ext {
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case ".jpg", ".jpeg":
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if err = jpeg.Encode(&buf, dstImage, nil); err != nil {
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glog.Error(err)
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}
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case ".png":
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if err = png.Encode(&buf, dstImage); err != nil {
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glog.Error(err)
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}
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case ".gif":
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if err = gif.Encode(&buf, dstImage, nil); err != nil {
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glog.Error(err)
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}
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}
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return bytes.NewReader(buf.Bytes()), err
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}
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