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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_HWUI_RESOURCE_CACHE_H
     18 #define ANDROID_HWUI_RESOURCE_CACHE_H
     19 
     20 #include <cutils/compiler.h>
     21 
     22 #include <SkBitmap.h>
     23 #include <SkPixelRef.h>
     24 
     25 #include <utils/KeyedVector.h>
     26 #include <utils/Singleton.h>
     27 
     28 #include <androidfw/ResourceTypes.h>
     29 
     30 namespace android {
     31 namespace uirenderer {
     32 
     33 class Layer;
     34 
     35 /**
     36  * Type of Resource being cached
     37  */
     38 enum ResourceType {
     39     kNinePatch,
     40 };
     41 
     42 class ResourceReference {
     43 public:
     44     explicit ResourceReference(ResourceType type) {
     45         refCount = 0;
     46         destroyed = false;
     47         resourceType = type;
     48     }
     49 
     50     int refCount;
     51     bool destroyed;
     52     ResourceType resourceType;
     53 };
     54 
     55 class ANDROID_API ResourceCache : public Singleton<ResourceCache> {
     56     ResourceCache();
     57     ~ResourceCache();
     58 
     59     friend class Singleton<ResourceCache>;
     60 
     61 public:
     62     /**
     63      * When using these two methods, make sure to only invoke the *Locked()
     64      * variants of increment/decrementRefcount(), recyle() and destructor()
     65      */
     66     void lock();
     67     void unlock();
     68 
     69     void incrementRefcount(const Res_png_9patch* resource);
     70 
     71     void decrementRefcount(const Res_png_9patch* resource);
     72 
     73     void decrementRefcountLocked(const Res_png_9patch* resource);
     74 
     75     void destructor(Res_png_9patch* resource);
     76 
     77     void destructorLocked(Res_png_9patch* resource);
     78 
     79 private:
     80     void deleteResourceReferenceLocked(const void* resource, ResourceReference* ref);
     81 
     82     void incrementRefcount(void* resource, ResourceType resourceType);
     83     void incrementRefcountLocked(void* resource, ResourceType resourceType);
     84 
     85     void decrementRefcount(void* resource);
     86     void decrementRefcountLocked(void* resource);
     87 
     88     void logCache();
     89 
     90     /**
     91      * Used to increment, decrement, and destroy. Incrementing is generally accessed on the UI
     92      * thread, but destroying resources may be called from the GC thread, the finalizer thread,
     93      * or a reference queue finalization thread.
     94      */
     95     mutable Mutex mLock;
     96 
     97     KeyedVector<const void*, ResourceReference*>* mCache;
     98 };
     99 
    100 };  // namespace uirenderer
    101 };  // namespace android
    102 
    103 #endif  // ANDROID_HWUI_RESOURCE_CACHE_H
    104