package images import ( "bytes" "image" "image/gif" "image/jpeg" "image/png" "io" "github.com/disintegration/imaging" "github.com/chrislusf/seaweedfs/weed/glog" ) func Resized(ext string, read io.ReadSeeker, width, height int, mode string) (resized io.ReadSeeker, w int, h int) { if width == 0 && height == 0 { return read, 0, 0 } srcImage, _, err := image.Decode(read) if err == nil { bounds := srcImage.Bounds() var dstImage *image.NRGBA if bounds.Dx() > width && width != 0 || bounds.Dy() > height && height != 0 { switch mode { case "fit": dstImage = imaging.Fit(srcImage, width, height, imaging.Lanczos) case "fill": dstImage = imaging.Fill(srcImage, width, height, imaging.Center, imaging.Lanczos) default: 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 { read.Seek(0, 0) return read, bounds.Dx(), bounds.Dy() } var buf bytes.Buffer switch ext { case ".png": png.Encode(&buf, dstImage) case ".jpg", ".jpeg": jpeg.Encode(&buf, dstImage, nil) case ".gif": gif.Encode(&buf, dstImage, nil) } return bytes.NewReader(buf.Bytes()), dstImage.Bounds().Dx(), dstImage.Bounds().Dy() } else { glog.Error(err) } return read, 0, 0 }