Limit lifetime of GrDrawContext objects

src/gpu/SkGr.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGr.h"
 
 #include "GrCaps.h"
@@ skipping 294 matching lines @@
     // copies of texels from the original.
     GrTextureParams params(SkShader::kClamp_TileMode,
                            Stretch::kBilerp_Type == stretch.fType ?
                               GrTextureParams::kBilerp_FilterMode :
                               GrTextureParams::kNone_FilterMode);
     paint.addColorTextureProcessor(inputTexture, SkMatrix::I(), params);
 
     SkRect rect = SkRect::MakeWH(SkIntToScalar(rtDesc.fWidth), SkIntToScalar(rtDesc.fHeight));
     SkRect localRect = SkRect::MakeWH(1.f, 1.f);
 
-    GrDrawContext* drawContext = context->drawContext();
+    SkAutoTUnref<GrDrawContext> drawContext(context->drawContext());
     if (!drawContext) {
         return nullptr;
     }
 
     drawContext->drawNonAARectToRect(stretched->asRenderTarget(), GrClip::WideOpen(), paint,
                                      SkMatrix::I(), rect, localRect);
 
     return stretched;
 }
 
@@ skipping 140 matching lines @@
 
     GrPaint paint;
     SkAutoTUnref<GrFragmentProcessor>
         yuvToRgbProcessor(GrYUVtoRGBEffect::Create(paint.getProcessorDataManager(), yuvTextures[0],
                                                    yuvTextures[1], yuvTextures[2],
                                                    yuvInfo.fSize, yuvInfo.fColorSpace));
     paint.addColorFragmentProcessor(yuvToRgbProcessor);
     SkRect r = SkRect::MakeWH(SkIntToScalar(yuvInfo.fSize[0].fWidth),
                               SkIntToScalar(yuvInfo.fSize[0].fHeight));
 
-    GrDrawContext* drawContext = ctx->drawContext();
+    SkAutoTUnref<GrDrawContext> drawContext(ctx->drawContext());
     if (!drawContext) {
         return nullptr;
     }
 
     drawContext->drawRect(renderTarget, GrClip::WideOpen(), paint, SkMatrix::I(), r);
 
     return result;
 }
 
 static GrTexture* create_unstretched_bitmap_texture(GrContext* ctx,
@@ skipping 433 matching lines @@
             SkErrorInternals::SetError( kInvalidPaint_SkError,
                                         "Sorry, I don't understand the filtering "
                                         "mode you asked for.  Falling back to "
                                         "MIPMaps.");
             textureFilterMode = GrTextureParams::kMipMap_FilterMode;
             break;
 
     }
     return textureFilterMode;
 }