change flattenable factory to return sk_sp

src/effects/SkDropShadowImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDropShadowImageFilter.h"
 
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
 #include "SkReadBuffer.h"
 #include "SkSpecialImage.h"
 #include "SkSpecialSurface.h"
 #include "SkWriteBuffer.h"
 
 SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy,
                                                  SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                                  ShadowMode shadowMode, SkImageFilter* input,
                                                  const CropRect* cropRect)
     : INHERITED(1, &input, cropRect)
     , fDx(dx)
     , fDy(dy)
     , fSigmaX(sigmaX)
     , fSigmaY(sigmaY)
     , fColor(color)
     , fShadowMode(shadowMode) {
 }
 
-SkFlattenable* SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar dx = buffer.readScalar();
     SkScalar dy = buffer.readScalar();
     SkScalar sigmaX = buffer.readScalar();
     SkScalar sigmaY = buffer.readScalar();
     SkColor color = buffer.readColor();
     ShadowMode shadowMode = buffer.isVersionLT(SkReadBuffer::kDropShadowMode_Version) ?
                             kDrawShadowAndForeground_ShadowMode :
                             static_cast<ShadowMode>(buffer.readInt());
-    return Create(dx, dy, sigmaX, sigmaY, color, shadowMode, common.getInput(0).get(),
-                  &common.cropRect());
+    return sk_sp<SkFlattenable>(Create(dx, dy, sigmaX, sigmaY, color, shadowMode,
+                                       common.getInput(0).get(), &common.cropRect()));
 }
 
 void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeScalar(fDx);
     buffer.writeScalar(fDy);
     buffer.writeScalar(fSigmaX);
     buffer.writeScalar(fSigmaY);
     buffer.writeColor(fColor);
     buffer.writeInt(static_cast<int>(fShadowMode));
@@ skipping 102 matching lines @@
         "kDrawShadowAndForeground", "kDrawShadowOnly"
     };
 
     static_assert(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), "enum_mismatch");
 
     str->appendf(" mode: %s", gModeStrings[fShadowMode]);
 
     str->append(")");
 }
 #endif