return pictures as sk_sp

include/core/SkCanvas.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
@@ skipping 977 matching lines @@
 
     /** Draw the picture into this canvas. This method effective brackets the
         playback of the picture's draw calls with save/restore, so the state
         of this canvas will be unchanged after this call.
         @param picture The recorded drawing commands to playback into this
                        canvas.
     */
     void drawPicture(const SkPicture* picture) {
         this->drawPicture(picture, NULL, NULL);
     }
-    void drawPicture(sk_sp<SkPicture>& picture) {
+    void drawPicture(const sk_sp<SkPicture>& picture) {
         this->drawPicture(picture.get());
     }
 
     /**
      *  Draw the picture into this canvas.
      *
      *  If matrix is non-null, apply that matrix to the CTM when drawing this picture. This is
      *  logically equivalent to
      *      save/concat/drawPicture/restore
      *
      *  If paint is non-null, draw the picture into a temporary buffer, and then apply the paint's
      *  alpha/colorfilter/imagefilter/xfermode to that buffer as it is drawn to the canvas.
      *  This is logically equivalent to
      *      saveLayer(paint)/drawPicture/restore
      */
     void drawPicture(const SkPicture*, const SkMatrix* matrix, const SkPaint* paint);
-    void drawPicture(sk_sp<SkPicture>& picture, const SkMatrix* matrix, const SkPaint* paint) {
+    void drawPicture(const sk_sp<SkPicture>& picture, const SkMatrix* matrix, const SkPaint* paint) {
         this->drawPicture(picture.get(), matrix, paint);
     }
 
     enum VertexMode {
         kTriangles_VertexMode,
         kTriangleStrip_VertexMode,
         kTriangleFan_VertexMode
     };
 
     /** Draw the array of vertices, interpreted as triangles (based on mode).
@@ skipping 525 matching lines @@
 
 class SkCanvasClipVisitor {
 public:
     virtual ~SkCanvasClipVisitor();
     virtual void clipRect(const SkRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipRRect(const SkRRect&, SkRegion::Op, bool antialias) = 0;
     virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) = 0;
 };
 
 #endif