change flattenable factory to return sk_sp

src/effects/SkAlphaThresholdFilter.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 "SkAlphaThresholdFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 247 matching lines @@
         inout->mulByUnknownSingleComponent();
     } else if (GrPixelConfigIsOpaque(this->texture(0)->config()) && fOuterThreshold >= 1.f) {
         inout->mulByUnknownOpaqueFourComponents();
     } else {
         inout->mulByUnknownFourComponents();
     }
 }
 
 #endif
 
-SkFlattenable* SkAlphaThresholdFilterImpl::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkAlphaThresholdFilterImpl::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar inner = buffer.readScalar();
     SkScalar outer = buffer.readScalar();
     SkRegion rgn;
     buffer.readRegion(&rgn);
-    return SkAlphaThresholdFilter::Make(rgn, inner, outer, common.getInput(0)).release();
+    return SkAlphaThresholdFilter::Make(rgn, inner, outer, common.getInput(0));
 }
 
 SkAlphaThresholdFilterImpl::SkAlphaThresholdFilterImpl(const SkRegion& region,
                                                        SkScalar innerThreshold,
                                                        SkScalar outerThreshold,
                                                        sk_sp<SkImageFilter> input)
     : INHERITED(&input, 1, nullptr)
     , fRegion(region)
     , fInnerThreshold(innerThreshold)
     , fOuterThreshold(outerThreshold) {
@@ skipping 120 matching lines @@
     return true;
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkAlphaThresholdFilterImpl::toString(SkString* str) const {
     str->appendf("SkAlphaThresholdImageFilter: (");
     str->appendf("inner: %f outer: %f", fInnerThreshold, fOuterThreshold);
     str->append(")");
 }
 #endif