Limit lifetime of GrDrawContext objects

src/effects/SkLightingImageFilter.cpp

 /*
  * Copyright 2012 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 "SkLightingImageFilter.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
@@ skipping 390 matching lines @@
     SkRect topLeft = SkRect::MakeXYWH(0, 0, 1, 1);
     SkRect top = SkRect::MakeXYWH(1, 0, dstRect.width() - 2, 1);
     SkRect topRight = SkRect::MakeXYWH(dstRect.width() - 1, 0, 1, 1);
     SkRect left = SkRect::MakeXYWH(0, 1, 1, dstRect.height() - 2);
     SkRect interior = dstRect.makeInset(1, 1);
     SkRect right = SkRect::MakeXYWH(dstRect.width() - 1, 1, 1, dstRect.height() - 2);
     SkRect bottomLeft = SkRect::MakeXYWH(0, dstRect.height() - 1, 1, 1);
     SkRect bottom = SkRect::MakeXYWH(1, dstRect.height() - 1, dstRect.width() - 2, 1);
     SkRect bottomRight = SkRect::MakeXYWH(dstRect.width() - 1, dstRect.height() - 1, 1, 1);
 
-    GrDrawContext* drawContext = context->drawContext();
+    SkAutoTUnref<GrDrawContext> drawContext(context->drawContext());
     if (!drawContext) {
         return false;
     }
 
     this->drawRect(drawContext, srcTexture, dst, matrix, clip, topLeft, kTopLeft_BoundaryMode, 
                    bounds);
     this->drawRect(drawContext, srcTexture, dst, matrix, clip, top, kTop_BoundaryMode, bounds);
     this->drawRect(drawContext, srcTexture, dst, matrix, clip, topRight, kTopRight_BoundaryMode,
                    bounds);
     this->drawRect(drawContext, srcTexture, dst, matrix, clip, left, kLeft_BoundaryMode, bounds);
@@ skipping 1603 matching lines @@
 
     fsBuilder->codeAppendf("%s(%s)", fLightColorFunc.c_str(), surfaceToLight);
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDiffuseLightingImageFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSpecularLightingImageFilter)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END