Reland of [2] of "switch colorfilters to sk_sp (patchset #11 id:200001 of https://codereview.chromium.o…

src/core/SkBlitter.cpp

 /*
  * 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.
  */
 
 #include "SkBlitter.h"
 #include "SkAntiRun.h"
 #include "SkColor.h"
@@ skipping 826 matching lines @@
     }
 
     /*
      *  If the xfermode is CLEAR, then we can completely ignore the installed
      *  color/shader/colorfilter, and just pretend we're SRC + color==0. This
      *  will fall into our optimizations for SRC mode.
      */
     if (SkXfermode::IsMode(mode, SkXfermode::kClear_Mode)) {
         SkPaint* p = paint.writable();
         shader = p->setShader(nullptr);
-        cf = p->setColorFilter(nullptr);
+        p->setColorFilter(nullptr);
+        cf = nullptr;
         mode = p->setXfermodeMode(SkXfermode::kSrc_Mode);
         p->setColor(0);
     }
 
     if (nullptr == shader) {
         if (mode) {
             // xfermodes (and filters) require shaders for our current blitters
             shader = new SkColorShader(paint->getColor());
             paint.writable()->setShader(shader)->unref();
             paint.writable()->setAlpha(0xFF);
         } else if (cf) {
             // if no shader && no xfermode, we just apply the colorfilter to
             // our color and move on.
             SkPaint* writablePaint = paint.writable();
             writablePaint->setColor(cf->filterColor(paint->getColor()));
             writablePaint->setColorFilter(nullptr);
             cf = nullptr;
         }
     }
 
     if (cf) {
         SkASSERT(shader);
-        paint.writable()->setShader(shader->makeWithColorFilter(cf));
+        paint.writable()->setShader(shader->makeWithColorFilter(sk_ref_sp(cf)));
         shader = paint->getShader();
         // blitters should ignore the presence/absence of a filter, since
         // if there is one, the shader will take care of it.
     }
 
     /*
      *  We create a SkShader::Context object, and store it on the blitter.
      */
     SkShader::Context* shaderContext = nullptr;
     if (shader) {
@@ skipping 121 matching lines @@
     fShaderContext->~Context();
     SkShader::Context* ctx = fShader->createContext(rec, (void*)fShaderContext);
     if (nullptr == ctx) {
         // Need a valid context in fShaderContext's storage, so we can later (or our caller) call
         // the in-place destructor.
         new (fShaderContext) SkZeroShaderContext(*fShader, rec);
         return false;
     }
     return true;
 }