GrResourceCache2 manages scratch texture.

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
 
 #include "GrGpuResource.h"
 #include "GrResourceKey.h"
 #include "SkTInternalLList.h"
 #include "SkTMultiMap.h"
 
 /**
  *  Eventual replacement for GrResourceCache. Currently it simply holds a list
  *  of all GrGpuResource objects for a GrContext. It is used to invalidate all
  *  the resources when necessary.
  */
 class GrResourceCache2 {
 public:
     GrResourceCache2() : fCount(0) {};
     ~GrResourceCache2();
 
-    void insertResource(GrGpuResource* resource);
+    void insertResource(GrGpuResource*);
 
-    void removeResource(GrGpuResource* resource);
+    void removeResource(GrGpuResource*);
 
     void abandonAll();
 
     void releaseAll();
 
+    GrGpuResource* findAndRefScratchResource(const GrResourceKey& scratchKey,
+                                             bool calledDuringFlush);
+
 private:
 #ifdef SK_DEBUG
     bool isInCache(const GrGpuResource* r) const {
         return fResources.isInList(r);
     }
 #endif
 
+    class AvailableForScratchUse;
 
-    void removeScratch(const GrGpuResource* resource);
     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