Revert of Discard scratch render targets before reusing them.

src/gpu/GrContext.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrContext.h"
@@ skipping 439 matching lines @@
 
     GrResource* resource = NULL;
     int origWidth = desc.fWidth;
     int origHeight = desc.fHeight;
 
     do {
         GrResourceKey key = GrTexture::ComputeScratchKey(desc);
         // Ensure we have exclusive access to the texture so future 'find' calls don't return it
         resource = fTextureCache->find(key, GrResourceCache::kHide_OwnershipFlag);
         if (NULL != resource) {
-            // If the scratch texture is a render target, discard its contents.
-            GrRenderTarget* rt = static_cast<GrTexture*>(resource)->asRenderTarget();
-            if (NULL != rt) {
-                rt->discard();
-            }
             resource->ref();
             break;
         }
         if (kExact_ScratchTexMatch == match) {
             break;
         }
         // We had a cache miss and we are in approx mode, relax the fit of the flags.
 
         // We no longer try to reuse textures that were previously used as render targets in
         // situations where no RT is needed; doing otherwise can confuse the video driver and
@@ skipping 1328 matching lines @@
     }
     return path;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 #if GR_CACHE_STATS
 void GrContext::printCacheStats() const {
     fTextureCache->printStats();
 }
 #endif