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

src/gpu/GrResourceCache2.h

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrResourceCache2_DEFINED
 #define GrResourceCache2_DEFINED
@@ skipping 14 matching lines @@
     ~GrResourceCache2();
 
     void insertResource(GrGpuResource*);
 
     void removeResource(GrGpuResource*);
 
     void abandonAll();
 
     void releaseAll();
 
-    GrGpuResource* findAndRefScratchResource(const GrResourceKey& scratchKey,
-                                             bool calledDuringFlush);
+    enum {
+        /** Preferentially returns scratch resources with no pending IO. */
+        kPreferNoPendingIO_ScratchFlag = 0x1,
+        /** Will not return any resources that match but have pending IO. */
+        kRequireNoPendingIO_ScratchFlag = 0x2,
+    };
+    GrGpuResource* findAndRefScratchResource(const GrResourceKey& scratchKey, uint32_t flags = 0);
 
 private:
 #ifdef SK_DEBUG
     bool isInCache(const GrGpuResource* r) const {
         return fResources.isInList(r);
     }
 #endif
 
     class AvailableForScratchUse;
 
     struct ScratchMapTraits {
         static const GrResourceKey& GetKey(const GrGpuResource& r) {
             return r.getScratchKey();
         }
 
         static uint32_t Hash(const GrResourceKey& key) { return key.getHash(); }
     };
     typedef SkTMultiMap<GrGpuResource, GrResourceKey, ScratchMapTraits> ScratchMap;
 
     int                                 fCount;
     SkTInternalLList<GrGpuResource>     fResources;
     // This map holds all resources that can be used as scratch resources.
     ScratchMap                          fScratchMap; 
 };
 
 #endif