change flattenable factory to return sk_sp

src/effects/SkImageSource.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageSource.h"
 
 #include "SkCanvas.h"
@@ skipping 17 matching lines @@
                              const SkRect& srcRect,
                              const SkRect& dstRect,
                              SkFilterQuality filterQuality)
     : INHERITED(0, nullptr)
     , fImage(std::move(image))
     , fSrcRect(srcRect)
     , fDstRect(dstRect)
     , fFilterQuality(filterQuality) {
 }
 
-SkFlattenable* SkImageSource::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkImageSource::CreateProc(SkReadBuffer& buffer) {
     SkFilterQuality filterQuality = (SkFilterQuality)buffer.readInt();
 
     SkRect src, dst;
     buffer.readRect(&src);
     buffer.readRect(&dst);
 
     sk_sp<SkImage> image(buffer.readImage());
     if (!image) {
         return nullptr;
     }
 
-    return SkImageSource::Make(std::move(image), src, dst, filterQuality).release();
+    return SkImageSource::Make(std::move(image), src, dst, filterQuality);
 }
 
 void SkImageSource::flatten(SkWriteBuffer& buffer) const {
     buffer.writeInt(fFilterQuality);
     buffer.writeRect(fSrcRect);
     buffer.writeRect(fDstRect);
     buffer.writeImage(fImage.get());
 }
 
 sk_sp<SkSpecialImage> SkImageSource::onFilterImage(SkSpecialImage* source, const Context& ctx,
@@ skipping 52 matching lines @@
 void SkImageSource::toString(SkString* str) const {
     str->appendf("SkImageSource: (");
     str->appendf("src: (%f,%f,%f,%f) dst: (%f,%f,%f,%f) ",
                  fSrcRect.fLeft, fSrcRect.fTop, fSrcRect.fRight, fSrcRect.fBottom,
                  fDstRect.fLeft, fDstRect.fTop, fDstRect.fRight, fDstRect.fBottom);
     str->appendf("image: (%d,%d)",
                  fImage->width(), fImage->height());
     str->append(")");
 }
 #endif