Add purgeAsNeeded calls before addResource calls

src/gpu/GrResourceCache.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 308 matching lines @@
 
     /**
      * Removes every resource in the cache that isn't locked.
      */
     void purgeAllUnlocked();
 
     /**
      * Allow cache to purge unused resources to obey resource limitations
      * Note: this entry point will be hidden (again) once totally ref-driven
      * cache maintenance is implemented
+     *
+     * extraCount and extraBytes are added to the current resource allocation
+     * to make sure enough room is available for future additions (e.g,
+     * 10MB across 10 textures is about to be added).
      */
-    void purgeAsNeeded();
+    void purgeAsNeeded(int extraCount = 0, size_t extraBytes = 0);
 
 #if GR_DEBUG
     void validate() const;
 #else
     void validate() const {}
 #endif
 
 #if GR_CACHE_STATS
     void printStats();
 #endif
@@ skipping 36 matching lines @@
     size_t fEntryBytes;
     int fClientDetachedCount;
     size_t fClientDetachedBytes;
 
     // prevents recursive purging
     bool           fPurging;
 
     PFOverbudgetCB fOverbudgetCB;
     void*          fOverbudgetData;
 
-    void internalPurge();
+    void internalPurge(int extraCount, size_t extraBytes);
 
 #if GR_DEBUG
     static size_t countBytes(const SkTInternalLList<GrResourceEntry>& list);
 #endif
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #if GR_DEBUG
     class GrAutoResourceCacheValidate {
     public:
         GrAutoResourceCacheValidate(GrResourceCache* cache) : fCache(cache) {
             cache->validate();
         }
         ~GrAutoResourceCacheValidate() {
             fCache->validate();
         }
     private:
         GrResourceCache* fCache;
     };
 #else
     class GrAutoResourceCacheValidate {
     public:
         GrAutoResourceCacheValidate(GrResourceCache*) {}
     };
 #endif
 
 #endif