axmol/cocos2dx/textures/CCTextureCache.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2011      Zynga Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/

#ifndef __CCTEXTURE_CACHE_H__
#define __CCTEXTURE_CACHE_H__

#include <string>
#include <mutex>
#include <thread>
#include <condition_variable>
#include <queue>
#include <string>

#include "cocoa/CCObject.h"
#include "cocoa/CCDictionary.h"
#include "textures/CCTexture2D.h"
#include "platform/CCImage.h"

#if CC_ENABLE_CACHE_TEXTURE_DATA
    #include "platform/CCImage.h"
    #include <list>
#endif

NS_CC_BEGIN

/**
 * @addtogroup textures
 * @{
 */

/** @brief Singleton that handles the loading of textures
* Once the texture is loaded, the next time it will return
* a reference of the previously loaded texture reducing GPU & CPU memory
*/
class CC_DLL TextureCache : public Object
{
public:
    /** Returns the shared instance of the cache */
    static TextureCache * getInstance();

    /** purges the cache. It releases the retained instance.
     @since v0.99.0
     */
    static void destroyInstance();

    /** @deprecated Use getInstance() instead */
    CC_DEPRECATED_ATTRIBUTE static TextureCache * sharedTextureCache();

    /** @deprecated Use destroyInstance() instead */
    CC_DEPRECATED_ATTRIBUTE static void purgeSharedTextureCache();

    /** Reload all textures
     It's only useful when the value of CC_ENABLE_CACHE_TEXTURE_DATA is 1
     */
    static void reloadAllTextures();

public:
    TextureCache();
    virtual ~TextureCache();

    const char* description(void) const;

    Dictionary* snapshotTextures();

    /** Returns a Texture2D object given an file image
    * If the file image was not previously loaded, it will create a new Texture2D
    *  object and it will return it. It will use the filename as a key.
    * Otherwise it will return a reference of a previously loaded image.
    * Supported image extensions: .png, .bmp, .tiff, .jpeg, .pvr, .gif
    */
    Texture2D* addImage(const char* fileimage);

    /* Returns a Texture2D object given a file image
    * If the file image was not previously loaded, it will create a new Texture2D object and it will return it.
    * Otherwise it will load a texture in a new thread, and when the image is loaded, the callback will be called with the Texture2D as a parameter.
    * The callback will be called from the main thread, so it is safe to create any cocos2d object from the callback.
    * Supported image extensions: .png, .jpg
    * @since v0.8
    */
    virtual void addImageAsync(const char *path, Object *target, SEL_CallFuncO selector);

    /** Returns a Texture2D object given an UIImage image
    * If the image was not previously loaded, it will create a new Texture2D object and it will return it.
    * Otherwise it will return a reference of a previously loaded image
    * The "key" parameter will be used as the "key" for the cache.
    * If "key" is nil, then a new texture will be created each time.
    */
    Texture2D* addUIImage(Image *image, const char *key);

    /** Returns an already created texture. Returns nil if the texture doesn't exist.
    @since v0.99.5
    */
    Texture2D* textureForKey(const char* key);

    /** Purges the dictionary of loaded textures.
    * Call this method if you receive the "Memory Warning"
    * In the short term: it will free some resources preventing your app from being killed
    * In the medium term: it will allocate more resources
    * In the long term: it will be the same
    */
    void removeAllTextures();

    /** Removes unused textures
    * Textures that have a retain count of 1 will be deleted
    * It is convenient to call this method after when starting a new Scene
    * @since v0.8
    */
    void removeUnusedTextures();

    /** Deletes a texture from the cache given a texture
    */
    void removeTexture(Texture2D* texture);

    /** Deletes a texture from the cache given a its key name
    @since v0.99.4
    */
    void removeTextureForKey(const char *textureKeyName);

    /** Output to CCLOG the current contents of this TextureCache
    * This will attempt to calculate the size of each texture, and the total texture memory in use
    *
    * @since v1.0
    */
    void dumpCachedTextureInfo();
    
    /** Returns a Texture2D object given an PVR filename
    * If the file image was not previously loaded, it will create a new Texture2D
    *  object and it will return it. Otherwise it will return a reference of a previously loaded image
    */
    Texture2D* addPVRImage(const char* filename);
    
    /** Returns a Texture2D object given an ETC filename
     * If the file image was not previously loaded, it will create a new Texture2D
     *  object and it will return it. Otherwise it will return a reference of a previously loaded image
     */
    Texture2D* addETCImage(const char* filename);

private:
    void addImageAsyncCallBack(float dt);
    void loadImage();
    Image::EImageFormat computeImageFormatType(std::string& filename);

public:
    struct AsyncStruct
    {
    public:
        AsyncStruct(const std::string& fn, Object *t, SEL_CallFuncO s) : filename(fn), target(t), selector(s) {}

        std::string            filename;
        Object    *target;
        SEL_CallFuncO        selector;
    };

protected:
    typedef struct _ImageInfo
    {
        AsyncStruct *asyncStruct;
        Image        *image;
        Image::EImageFormat imageType;
    } ImageInfo;
    
    std::thread* _loadingThread;

    std::queue<AsyncStruct*>* _asyncStructQueue;
    std::queue<ImageInfo*>* _imageInfoQueue;

    std::mutex _asyncStructQueueMutex;
    std::mutex _imageInfoMutex;

    std::mutex _sleepMutex;
    std::condition_variable _sleepCondition;

    bool _needQuit;

    int _asyncRefCount;

    Dictionary* _textures;

    static TextureCache *_sharedTextureCache;
};

#if CC_ENABLE_CACHE_TEXTURE_DATA

class VolatileTexture
{
    typedef enum {
        kInvalid = 0,
        kImageFile,
        kImageData,
        kString,
        kImage,
    }ccCachedImageType;

public:
    VolatileTexture(Texture2D *t);
    ~VolatileTexture();

    static void addImageTexture(Texture2D *tt, const char* imageFileName, Image::EImageFormat format);
    static void addStringTexture(Texture2D *tt, const char* text, const Size& dimensions, TextAlignment alignment, 
                                 VerticalTextAlignment vAlignment, const char *fontName, float fontSize);
    static void addDataTexture(Texture2D *tt, void* data, Texture2DPixelFormat pixelFormat, const Size& contentSize);
    static void addImage(Texture2D *tt, Image *image);

    static void setTexParameters(Texture2D *t, const ccTexParams &texParams);
    static void removeTexture(Texture2D *t);
    static void reloadAllTextures();

public:
    static std::list<VolatileTexture*> textures;
    static bool isReloading;
    
private:
    // find VolatileTexture by Texture2D*
    // if not found, create a new one
    static VolatileTexture* findVolotileTexture(Texture2D *tt);

protected:
    Texture2D *texture;
    
    Image *uiImage;

    ccCachedImageType _cashedImageType;

    void *_textureData;
    Size _textureSize;
    Texture2DPixelFormat _pixelFormat;

    std::string _fileName;
    Image::EImageFormat _fmtImage;

    ccTexParams     _texParams;
    Size          _size;
    TextAlignment _alignment;
    VerticalTextAlignment _vAlignment;
    std::string     _fontName;
    std::string     _text;
    float           _fontSize;
};

#endif

// end of textures group
/// @}

NS_CC_END

#endif //__CCTEXTURE_CACHE_H__