Add a 'unique' method to SkRefCnt, document the usage, and add support.

src/gpu/GrResourceCache.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 146 matching lines @@
 #endif
     }
 }
 
 // This functor just searches for an entry with only a single ref (from
 // the texture cache itself). Presumably in this situation no one else
 // is relying on the texture.
 class GrTFindUnreffedFunctor {
 public:
     bool operator()(const GrResourceEntry* entry) const {
-        return 1 == entry->resource()->getRefCnt();
+        return entry->resource()->unique();
     }
 };
 
 GrResource* GrResourceCache::find(const GrResourceKey& key, uint32_t ownershipFlags) {
     GrAutoResourceCacheValidate atcv(this);
 
     GrResourceEntry* entry = NULL;
 
     if (ownershipFlags & kNoOtherOwners_OwnershipFlag) {
         GrTFindUnreffedFunctor functor;
@@ skipping 153 matching lines @@
         while (NULL != entry) {
             GrAutoResourceCacheValidate atcv(this);
 
             if ((fEntryCount+extraCount) <= fMaxCount &&
                 (fEntryBytes+extraBytes) <= fMaxBytes) {
                 withinBudget = true;
                 break;
             }
 
             GrResourceEntry* prev = iter.prev();
-            if (1 == entry->fResource->getRefCnt()) {
+            if (entry->fResource->unique()) {
                 changed = true;
                 this->deleteResource(entry);
             }
             entry = prev;
         }
     } while (!withinBudget && changed);
 }
 
 void GrResourceCache::purgeAllUnlocked() {
     GrAutoResourceCacheValidate atcv(this);
@@ skipping 113 matching lines @@
                 fEntryBytes, fHighWaterEntryBytes);
     SkDebugf("\t\tDetached Entry Count: current %d high %d\n",
                 fClientDetachedCount, fHighWaterClientDetachedCount);
     SkDebugf("\t\tDetached Bytes: current %d high %d\n",
                 fClientDetachedBytes, fHighWaterClientDetachedBytes);
 }
 
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////