change flattenable factory to return sk_sp

src/effects/gradients/SkLinearGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk4fLinearGradient.h"
 #include "SkLinearGradient.h"
 
@@ skipping 36 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc)
     : SkGradientShaderBase(desc, pts_to_unit_matrix(pts))
     , fStart(pts[0])
     , fEnd(pts[1]) {
 }
 
-SkFlattenable* SkLinearGradient::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkLinearGradient::CreateProc(SkReadBuffer& buffer) {
     DescriptorScope desc;
     if (!desc.unflatten(buffer)) {
         return nullptr;
     }
     SkPoint pts[2];
     pts[0] = buffer.readPoint();
     pts[1] = buffer.readPoint();
     return SkGradientShader::MakeLinear(pts, desc.fColors, desc.fPos, desc.fCount, desc.fTileMode,
-                                        desc.fGradFlags, desc.fLocalMatrix).release();
+                                        desc.fGradFlags, desc.fLocalMatrix);
 }
 
 void SkLinearGradient::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writePoint(fStart);
     buffer.writePoint(fEnd);
 }
 
 size_t SkLinearGradient::onContextSize(const ContextRec& rec) const {
     return use_4f_context(rec, fGradFlags)
@@ skipping 667 matching lines @@
             this->shade4_dx_clamp<false, true>(dstC, count, fx, dx, invDx, dither);
         }
     } else {
         if (fApplyAlphaAfterInterp) {
             this->shade4_dx_clamp<true, false>(dstC, count, fx, dx, invDx, dither);
         } else {
             this->shade4_dx_clamp<false, false>(dstC, count, fx, dx, invDx, dither);
         }
     }
 }