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42 lines
828 B
42 lines
828 B
package images
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import (
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"bytes"
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"image"
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"image/color"
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"image/gif"
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"image/jpeg"
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"image/png"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/disintegration/gift"
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)
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func Rotate(ext string, data []byte, rotate int) (resized []byte) {
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if rotate < 1 {
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return data
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}
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srcImage, _, err := image.Decode(bytes.NewReader(data))
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if err == nil {
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var dstImage *image.NRGBA
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g := gift.New(
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gift.Rotate(float32(rotate), color.Opaque, gift.CubicInterpolation),
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)
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dstImage = image.NewNRGBA(g.Bounds(srcImage.Bounds()))
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g.Draw(dstImage, srcImage)
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var buf bytes.Buffer
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switch ext {
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case ".png":
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png.Encode(&buf, dstImage)
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case ".jpg", ".jpeg":
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jpeg.Encode(&buf, dstImage, nil)
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case ".gif":
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gif.Encode(&buf, dstImage, nil)
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}
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return buf.Bytes()
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} else {
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glog.Error(err)
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}
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return data
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}
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