Limit lifetime of GrDrawContext objects

src/gpu/effects/GrConfigConversionEffect.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 "GrConfigConversionEffect.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
@@ skipping 208 matching lines @@
         SkAutoTUnref<GrFragmentProcessor> pmToUPM1(new GrConfigConversionEffect(
                 paint1.getProcessorDataManager(), dataTex, false, *pmToUPMRule, SkMatrix::I()));
         SkAutoTUnref<GrFragmentProcessor> upmToPM(new GrConfigConversionEffect(
                 paint2.getProcessorDataManager(), readTex, false, *upmToPMRule, SkMatrix::I()));
         SkAutoTUnref<GrFragmentProcessor> pmToUPM2(new GrConfigConversionEffect(
                 paint3.getProcessorDataManager(), tempTex, false, *pmToUPMRule, SkMatrix::I()));
 
         paint1.addColorFragmentProcessor(pmToUPM1);
 
 
-        GrDrawContext* readDrawContext = context->drawContext();
+        SkAutoTUnref<GrDrawContext> readDrawContext(context->drawContext());
         if (!readDrawContext) {
             failed = true;
             break;
         }
 
         readDrawContext->drawNonAARectToRect(readTex->asRenderTarget(),
                                              GrClip::WideOpen(),
                                              paint1,
                                              SkMatrix::I(),
                                              kDstRect,
                                              kSrcRect);
 
         readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
 
         paint2.addColorFragmentProcessor(upmToPM);
 
-        GrDrawContext* tempDrawContext = context->drawContext();
+        SkAutoTUnref<GrDrawContext> tempDrawContext(context->drawContext());
         if (!tempDrawContext) {
             failed = true;
             break;
         }
         tempDrawContext->drawNonAARectToRect(tempTex->asRenderTarget(),
                                              GrClip::WideOpen(),
                                              paint2,
                                              SkMatrix::I(),
                                              kDstRect,
                                              kSrcRect);
 
         paint3.addColorFragmentProcessor(pmToUPM2);
 
-        readDrawContext = context->drawContext();
+        readDrawContext.reset(context->drawContext());
         if (!readDrawContext) {
             failed = true;
             break;
         }
 
         readDrawContext->drawNonAARectToRect(readTex->asRenderTarget(),
                                              GrClip::WideOpen(),
                                              paint3,
                                              SkMatrix::I(),
                                              kDstRect,
@@ skipping 31 matching lines @@
         if (kRGBA_8888_GrPixelConfig != texture->config() &&
             kBGRA_8888_GrPixelConfig != texture->config() &&
             kNone_PMConversion != pmConversion) {
             // The PM conversions assume colors are 0..255
             return nullptr;
         }
         return new GrConfigConversionEffect(procDataManager, texture, swapRedAndBlue, pmConversion,
                                             matrix);
     }
 }