Prefer to recycle non-RT scratch textures that don't have pending IO

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 452 matching lines @@
         if (kApprox_ScratchTexMatch == match) {
             // bin by pow2 with a reasonable min
             static const int MIN_SIZE = 16;
             GrTextureDesc* wdesc = desc.writable();
             wdesc->fWidth  = SkTMax(MIN_SIZE, GrNextPow2(desc->fWidth));
             wdesc->fHeight = SkTMax(MIN_SIZE, GrNextPow2(desc->fHeight));
         }
 
         do {
             GrResourceKey key = GrTexturePriv::ComputeScratchKey(*desc);
-            GrGpuResource* resource = fResourceCache2->findAndRefScratchResource(key,
-                                                                                 calledDuringFlush);
+            uint32_t scratchFlags = 0;
+            if (calledDuringFlush) {
+                scratchFlags = GrResourceCache2::kRequireNoPendingIO_ScratchFlag;
+            } else  if (!(desc->fFlags & kRenderTarget_GrTextureFlagBit)) {
+                // If it is not a render target then it will most likely be populated by
+                // writePixels() which will trigger a flush if the texture has pending IO.
+                scratchFlags = GrResourceCache2::kPreferNoPendingIO_ScratchFlag;
+            }
+            GrGpuResource* resource = fResourceCache2->findAndRefScratchResource(key, scratchFlags);
             if (resource) {
                 fResourceCache->makeResourceMRU(resource);
                 return static_cast<GrTexture*>(resource);
             }
 
             if (kExact_ScratchTexMatch == match) {
                 break;
             }
             // We had a cache miss and we are in approx mode, relax the fit of the flags.
 
@@ skipping 1302 matching lines @@
     fResourceCache->printStats();
 }
 #endif
 
 #if GR_GPU_STATS
 const GrContext::GPUStats* GrContext::gpuStats() const {
     return fGpu->gpuStats();
 }
 #endif