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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 
     24 #include <utils/KeyedVector.h>
     25 
     26 #include <androidfw/ResourceTypes.h>
     27 
     28 #include "Layer.h"
     29 
     30 namespace android {
     31 namespace uirenderer {
     32 
     33 /**
     34  * Type of Resource being cached
     35  */
     36 enum ResourceType {
     37     kBitmap,
     38     kNinePatch,
     39     kPath,
     40     kLayer
     41 };
     42 
     43 class ResourceReference {
     44 public:
     45 
     46     ResourceReference() { refCount = 0; recycled = false; destroyed = false;}
     47     ResourceReference(ResourceType type) {
     48         refCount = 0; recycled = false; destroyed = false; resourceType = type;
     49     }
     50 
     51     int refCount;
     52     bool recycled;
     53     bool destroyed;
     54     ResourceType resourceType;
     55 };
     56 
     57 class ANDROID_API ResourceCache {
     58 public:
     59     ResourceCache();
     60     ~ResourceCache();
     61 
     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 SkPath* resource);
     70     void incrementRefcount(const SkBitmap* resource);
     71     void incrementRefcount(const Res_png_9patch* resource);
     72     void incrementRefcount(Layer* resource);
     73 
     74     void incrementRefcountLocked(const SkPath* resource);
     75     void incrementRefcountLocked(const SkBitmap* resource);
     76     void incrementRefcountLocked(const Res_png_9patch* resource);
     77     void incrementRefcountLocked(Layer* resource);
     78 
     79     void decrementRefcount(const SkBitmap* resource);
     80     void decrementRefcount(const SkPath* resource);
     81     void decrementRefcount(const Res_png_9patch* resource);
     82     void decrementRefcount(Layer* resource);
     83 
     84     void decrementRefcountLocked(const SkBitmap* resource);
     85     void decrementRefcountLocked(const SkPath* resource);
     86     void decrementRefcountLocked(const Res_png_9patch* resource);
     87     void decrementRefcountLocked(Layer* resource);
     88 
     89     void destructor(SkPath* resource);
     90     void destructor(const SkBitmap* resource);
     91     void destructor(Res_png_9patch* resource);
     92 
     93     void destructorLocked(SkPath* resource);
     94     void destructorLocked(const SkBitmap* resource);
     95     void destructorLocked(Res_png_9patch* resource);
     96 
     97     bool recycle(SkBitmap* resource);
     98     bool recycleLocked(SkBitmap* resource);
     99 
    100 private:
    101     void deleteResourceReferenceLocked(const void* resource, ResourceReference* ref);
    102 
    103     void incrementRefcount(void* resource, ResourceType resourceType);
    104     void incrementRefcountLocked(void* resource, ResourceType resourceType);
    105 
    106     void decrementRefcount(void* resource);
    107     void decrementRefcountLocked(void* resource);
    108 
    109     void logCache();
    110 
    111     /**
    112      * Used to increment, decrement, and destroy. Incrementing is generally accessed on the UI
    113      * thread, but destroying resources may be called from the GC thread, the finalizer thread,
    114      * or a reference queue finalization thread.
    115      */
    116     mutable Mutex mLock;
    117 
    118     KeyedVector<const void*, ResourceReference*>* mCache;
    119 };
    120 
    121 }; // namespace uirenderer
    122 }; // namespace android
    123 
    124 #endif // ANDROID_HWUI_RESOURCE_CACHE_H
    125