旋转、重命名

weed/images/rotate.go

@@ -0,0 +1,42 @@
+package images
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/disintegration/gift"
+)
+
+func Rotate(ext string, data []byte, rotate int) (resized []byte) {
+	if rotate < 1 {
+		return data
+	}
+	srcImage, _, err := image.Decode(bytes.NewReader(data))
+	if err == nil {
+		var dstImage *image.NRGBA
+		g := gift.New(
+			gift.Rotate(float32(rotate), color.Opaque, gift.CubicInterpolation),
+		)
+		dstImage = image.NewNRGBA(g.Bounds(srcImage.Bounds()))
+		g.Draw(dstImage, srcImage)
+
+		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 buf.Bytes()
+	} else {
+		glog.Error(err)
+	}
+	return data
+}

weed/server/volume_server_handlers_read.go

@@ -132,6 +132,17 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			height, _ = strconv.Atoi(r.FormValue("height"))
 		}
 		n.Data, _, _ = images.Resized(ext, n.Data, width, height)
+
+		//旋转
+		if r.FormValue("rotate") != "" {
+			rotate, _ := strconv.Atoi(r.FormValue("rotate"))
+			n.Data = images.Rotate(ext, n.Data, rotate)
+		}
+	}
+
+	//重命名
+	if r.FormValue("rename") != "" {
+		filename = r.FormValue("rename")
 	}
 
 	if e := writeResponseContent(filename, mtype, bytes.NewReader(n.Data), w, r); e != nil {