Reduce the minimum scratch size to 16, don't look for next pow2 larger sizes.

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 410 matching lines @@
 }
 
 GrTexture* GrContext::lockAndRefScratchTexture(const GrTextureDesc& inDesc, ScratchTexMatch match) {
     GrTextureDesc desc = inDesc;
 
     GrAssert((desc.fFlags & kRenderTarget_GrTextureFlagBit) ||
              !(desc.fFlags & kNoStencil_GrTextureFlagBit));
 
     if (kApprox_ScratchTexMatch == match) {
         // bin by pow2 with a reasonable min
-        static const int MIN_SIZE = 256;
+        static const int MIN_SIZE = 16;
         desc.fWidth  = GrMax(MIN_SIZE, GrNextPow2(desc.fWidth));
         desc.fHeight = GrMax(MIN_SIZE, GrNextPow2(desc.fHeight));
     }
 
     // Renderable A8 targets are not universally supported (e.g., not on ANGLE)
     GrAssert(this->isConfigRenderable(kAlpha_8_GrPixelConfig) ||
              !(desc.fFlags & kRenderTarget_GrTextureFlagBit) ||
              (desc.fConfig != kAlpha_8_GrPixelConfig));
 
     GrResource* resource = NULL;
     int origWidth = desc.fWidth;
     int origHeight = desc.fHeight;
     bool doubledW = false;
     bool doubledH = false;
 
     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) {
             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... then try
-        // doubling width... then the height.
+        // 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
         // cause significant performance problems in some cases.
         if (desc.fFlags & kNoStencil_GrTextureFlagBit) {
             desc.fFlags = desc.fFlags & ~kNoStencil_GrTextureFlagBit;
-        } else if (!doubledW) {
-            desc.fFlags = inDesc.fFlags;
-            desc.fWidth *= 2;
-            doubledW = true;
-        } else if (!doubledH) {
-            desc.fFlags = inDesc.fFlags;
-            desc.fWidth = origWidth;
-            desc.fHeight *= 2;
-            doubledH = true;
         } else {
             break;
         }
 
     } while (true);
 
     if (NULL == resource) {
         desc.fFlags = inDesc.fFlags;
         desc.fWidth = origWidth;
         desc.fHeight = origHeight;
@@ skipping 1507 matching lines @@
         return srcTexture;
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 #if GR_CACHE_STATS
 void GrContext::printCacheStats() const {
     fTextureCache->printStats();
 }
 #endif