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      1 /*
      2  * Copyright (C) 2010, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *     notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *     notice, this list of conditions and the following disclaimer in the
     11  *     documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #ifndef TextureManager_h
     26 #define TextureManager_h
     27 
     28 #include "GraphicsContext3D.h"
     29 #include "IntRect.h"
     30 #include "IntSize.h"
     31 
     32 #include <wtf/FastAllocBase.h>
     33 #include <wtf/HashMap.h>
     34 #include <wtf/ListHashSet.h>
     35 
     36 namespace WebCore {
     37 
     38 typedef int TextureToken;
     39 
     40 class TextureManager {
     41     WTF_MAKE_NONCOPYABLE(TextureManager);
     42 public:
     43     static PassOwnPtr<TextureManager> create(GraphicsContext3D* context, size_t memoryLimitBytes, int maxTextureSize)
     44     {
     45         return adoptPtr(new TextureManager(context, memoryLimitBytes, maxTextureSize));
     46     }
     47 
     48     TextureToken getToken();
     49     void releaseToken(TextureToken);
     50     bool hasTexture(TextureToken);
     51 
     52     unsigned requestTexture(TextureToken, IntSize, unsigned textureFormat, bool* newTexture = 0);
     53 
     54     void protectTexture(TextureToken);
     55     void unprotectAllTextures();
     56     bool isProtected(TextureToken);
     57 
     58 private:
     59     TextureManager(GraphicsContext3D*, size_t memoryLimitBytes, int maxTextureSize);
     60 
     61     struct TextureInfo {
     62         IntSize size;
     63         unsigned format;
     64         unsigned textureId;
     65         bool isProtected;
     66     };
     67 
     68     bool reduceMemoryToLimit(size_t);
     69     void addTexture(TextureToken, TextureInfo);
     70     void removeTexture(TextureToken, TextureInfo);
     71 
     72     RefPtr<GraphicsContext3D> m_context;
     73 
     74     typedef HashMap<TextureToken, TextureInfo> TextureMap;
     75     TextureMap m_textures;
     76     ListHashSet<TextureToken> m_textureLRUSet;
     77 
     78     size_t m_memoryLimitBytes;
     79     size_t m_memoryUseBytes;
     80     int m_maxTextureSize;
     81     TextureToken m_nextToken;
     82 };
     83 
     84 }
     85 
     86 #endif
     87