GrResourceCache2 manages scratch texture.

src/gpu/GrResourceCache.h

Index: src/gpu/GrResourceCache.h
diff --git a/src/gpu/GrResourceCache.h b/src/gpu/GrResourceCache.h
index 83337805a42f1c3a021f9ff61f4276b3cfe32316..f6d064af395be1f44691c4d326efc676ca70db88 100644
--- a/src/gpu/GrResourceCache.h
+++ b/src/gpu/GrResourceCache.h
@@ -6,11 +6,10 @@
  * found in the LICENSE file.
  */
 
-
-
 #ifndef GrResourceCache_DEFINED
 #define GrResourceCache_DEFINED
 
+#include "GrDrawTargetCaps.h"
 #include "GrResourceKey.h"
 #include "SkTMultiMap.h"
 #include "SkMessageBus.h"
@@ -88,7 +87,7 @@ private:
  */
 class GrResourceCache {
 public:
-    GrResourceCache(int maxCount, size_t maxBytes);
+    GrResourceCache(const GrDrawTargetCaps*, int maxCount, size_t maxBytes);
     ~GrResourceCache();
 
     /**
@@ -141,26 +140,16 @@ public:
      */
     int getCachedResourceCount() const { return fEntryCount; }
 
-    // For a found or added resource to be completely exclusive to the caller
-    // both the kNoOtherOwners and kHide flags need to be specified
-    enum OwnershipFlags {
-        kNoOtherOwners_OwnershipFlag = 0x1, // found/added resource has no other owners
-        kHide_OwnershipFlag = 0x2  // found/added resource is hidden from future 'find's
-    };
-
     /**
      *  Search for an entry with the same Key. If found, return it.
      *  If not found, return null.
-     *  If ownershipFlags includes kNoOtherOwners and a resource is returned
-     *  then that resource has no other refs to it.
-     *  If ownershipFlags includes kHide and a resource is returned then that
-     *  resource will not be returned from future 'find' calls until it is
-     *  'freed' (and recycled) or makeNonExclusive is called.
-     *  For a resource to be completely exclusive to a caller both kNoOtherOwners
-     *  and kHide must be specified.
      */
-    GrGpuResource* find(const GrResourceKey& key,
-                        uint32_t ownershipFlags = 0);
+    GrGpuResource* find(const GrResourceKey& key);
+
+    void makeResourceMRU(GrGpuResource*);
+
+    /** Called by GrGpuResources when they detects that they are newly purgable. */
+    void notifyPurgable(const GrGpuResource*);
 
     /**
      *  Add the new resource to the cache (by creating a new cache entry based
@@ -168,14 +157,8 @@ public:
      *
      *  Ownership of the resource is transferred to the resource cache,
      *  which will unref() it when it is purged or deleted.
-     *
-     *  If ownershipFlags includes kHide, subsequent calls to 'find' will not
-     *  return 'resource' until it is 'freed' (and recycled) or makeNonExclusive
-     *  is called.
      */
-    void addResource(const GrResourceKey& key,
-                     GrGpuResource* resource,
-                     uint32_t ownershipFlags = 0);
+    void addResource(const GrResourceKey& key, GrGpuResource* resource);
 
     /**
      * Determines if the cache contains an entry matching a key. If a matching
@@ -184,20 +167,6 @@ public:
     bool hasKey(const GrResourceKey& key) const { return SkToBool(fCache.find(key)); }
 
     /**
-     * Hide 'entry' so that future searches will not find it. Such
-     * hidden entries will not be purged. The entry still counts against
-     * the cache's budget and should be made non-exclusive when exclusive access
-     * is no longer needed.
-     */
-    void makeExclusive(GrResourceCacheEntry* entry);
-
-    /**
-     * Restore 'entry' so that it can be found by future searches. 'entry'
-     * will also be purgeable (provided its lock count is now 0.)
-     */
-    void makeNonExclusive(GrResourceCacheEntry* entry);
-
-    /**
      * Notify the cache that the size of a resource has changed.
      */
     void didIncreaseResourceSize(const GrResourceCacheEntry*, size_t amountInc);
@@ -237,59 +206,45 @@ public:
 #endif
 
 private:
-    enum BudgetBehaviors {
-        kAccountFor_BudgetBehavior,
-        kIgnore_BudgetBehavior
-    };
-
-    void internalDetach(GrResourceCacheEntry*, BudgetBehaviors behavior = kAccountFor_BudgetBehavior);
-    void attachToHead(GrResourceCacheEntry*, BudgetBehaviors behavior = kAccountFor_BudgetBehavior);
-
-    void removeInvalidResource(GrResourceCacheEntry* entry);
+    void internalDetach(GrResourceCacheEntry*);
+    void attachToHead(GrResourceCacheEntry*);
+    void purgeInvalidated();
+    void internalPurge(int extraCount, size_t extraBytes);
+#ifdef SK_DEBUG
+    static size_t countBytes(const SkTInternalLList<GrResourceCacheEntry>& list);
+#endif
 
-    SkTMultiMap<GrResourceCacheEntry, GrResourceKey> fCache;
+    typedef SkTMultiMap<GrResourceCacheEntry, GrResourceKey> CacheMap;
+    CacheMap                                fCache;
 
     // We're an internal doubly linked list
     typedef SkTInternalLList<GrResourceCacheEntry> EntryList;
-    EntryList      fList;
-
-#ifdef SK_DEBUG
-    // These objects cannot be returned by a search
-    EntryList      fExclusiveList;
-#endif
+    EntryList                               fList;
 
     // our budget, used in purgeAsNeeded()
-    int            fMaxCount;
-    size_t         fMaxBytes;
+    int                                     fMaxCount;
+    size_t                                  fMaxBytes;
 
     // our current stats, related to our budget
 #if GR_CACHE_STATS
-    int            fHighWaterEntryCount;
-    size_t         fHighWaterEntryBytes;
-    int            fHighWaterClientDetachedCount;
-    size_t         fHighWaterClientDetachedBytes;
+    int                                     fHighWaterEntryCount;
+    size_t                                  fHighWaterEntryBytes;
 #endif
 
-    int            fEntryCount;
-    size_t         fEntryBytes;
-    int            fClientDetachedCount;
-    size_t         fClientDetachedBytes;
+    int                                     fEntryCount;
+    size_t                                  fEntryBytes;
 
     // prevents recursive purging
-    bool           fPurging;
+    bool                                    fPurging;
 
-    PFOverbudgetCB fOverbudgetCB;
-    void*          fOverbudgetData;
+    PFOverbudgetCB                          fOverbudgetCB;
+    void*                                   fOverbudgetData;
 
-    void internalPurge(int extraCount, size_t extraBytes);
+    SkAutoTUnref<const GrDrawTargetCaps>    fCaps;
 
     // Listen for messages that a resource has been invalidated and purge cached junk proactively.
-    SkMessageBus<GrResourceInvalidatedMessage>::Inbox fInvalidationInbox;
-    void purgeInvalidated();
-
-#ifdef SK_DEBUG
-    static size_t countBytes(const SkTInternalLList<GrResourceCacheEntry>& list);
-#endif
+   typedef  SkMessageBus<GrResourceInvalidatedMessage>::Inbox Inbox;
+   Inbox                                    fInvalidationInbox;
 };
 
 ///////////////////////////////////////////////////////////////////////////////