axmol/cocos2dx/textures/CCTextureCache.h

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

http://www.cocos2d-x.org

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****************************************************************************/

#ifndef __CCTEXTURE_CACHE_H__
#define __CCTEXTURE_CACHE_H__

#include <string>
#include "CCObject.h"
#include "CCDictionary.h"
#include "CCTexture2D.h"


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

NS_CC_BEGIN

class CCLock;
class CCImage;

/** @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 CCTextureCache : public CCObject
{
protected:
    CCDictionary* m_pTextures;
    //pthread_mutex_t                *m_pDictLock;


private:
    // @todo void addImageWithAsyncObject(CCAsyncObject* async);
    void addImageAsyncCallBack(float dt);

public:

    CCTextureCache();
    virtual ~CCTextureCache();

    const char* description(void);

    CCDictionary* snapshotTextures();

    /** Retruns ths shared instance of the cache */
    static CCTextureCache * sharedTextureCache();

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

    /** Returns a Texture2D object given an file image
    * If the file image was not previously loaded, it will create a new CCTexture2D
    *  object and it will return it. It will use the filename as a key.
    * Otherwise it will return a reference of a previosly loaded image.
    * Supported image extensions: .png, .bmp, .tiff, .jpeg, .pvr, .gif
    */
    CCTexture2D* 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 CCTexture2D 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
    */
    
    void addImageAsync(const char *path, CCObject *target, SEL_CallFuncO selector);

    /* Returns a Texture2D object given an CGImageRef image
    * If the image was not previously loaded, it will create a new CCTexture2D 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.
    * @since v0.8
    */
    // @todo CGImageRef CCTexture2D* addCGImage(CGImageRef image, string &  key);
    /** Returns a Texture2D object given an UIImage image
    * If the image was not previously loaded, it will create a new CCTexture2D 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.
    */
    CCTexture2D* addUIImage(CCImage *image, const char *key);

    /** Returns an already created texture. Returns nil if the texture doesn't exist.
    @since v0.99.5
    */
    CCTexture2D* 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 convinient 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(CCTexture2D* 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 CCTextureCache
    * This will attempt to calculate the size of each texture, and the total texture memory in use
    *
    * @since v1.0
    */
    void dumpCachedTextureInfo();

#ifdef CC_SUPPORT_PVRTC
    /** Returns a Texture2D object given an PVRTC RAW filename
    * If the file image was not previously loaded, it will create a new CCTexture2D
    *  object and it will return it. Otherwise it will return a reference of a previosly loaded image
    *
    * It can only load square images: width == height, and it must be a power of 2 (128,256,512...)
    * bpp can only be 2 or 4. 2 means more compression but lower quality.
    * hasAlpha: whether or not the image contains alpha channel
    */
    CCTexture2D* addPVRTCImage(const char* fileimage, int bpp, bool hasAlpha, int width);
#endif // CC_SUPPORT_PVRTC
    
    /** Returns a Texture2D object given an PVR filename
    * If the file image was not previously loaded, it will create a new CCTexture2D
    *  object and it will return it. Otherwise it will return a reference of a previosly loaded image
    */
    CCTexture2D* addPVRImage(const char* filename);

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

#if CC_ENABLE_CACHE_TEXTURE_DATA

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

public:
    VolatileTexture(CCTexture2D *t);
    ~VolatileTexture();

    static void addImageTexture(CCTexture2D *tt, const char* imageFileName, CCImage::EImageFormat format);
    static void addStringTexture(CCTexture2D *tt, const char* text, const CCSize& dimensions, CCTextAlignment alignment, 
                                 CCVerticalTextAlignment vAlignment, const char *fontName, float fontSize);
    static void addDataTexture(CCTexture2D *tt, void* data, CCTexture2DPixelFormat pixelFormat, const CCSize& contentSize);
    static void addCCImage(CCTexture2D *tt, CCImage *image);

    static void removeTexture(CCTexture2D *t);
    static void reloadAllTextures();

public:
    static std::list<VolatileTexture*> textures;
    static bool isReloading;
    
private:
    // find VolatileTexture by CCTexture2D*
    // if not found, create a new one
    static VolatileTexture* findVolotileTexture(CCTexture2D *tt);

protected:
    CCTexture2D *texture;
    
    CCImage *uiImage;

    ccCachedImageType m_eCashedImageType;

    void *m_pTextureData;
    CCSize m_TextureSize;
    CCTexture2DPixelFormat m_PixelFormat;

    std::string m_strFileName;
    CCImage::EImageFormat m_FmtImage;

    CCSize          m_size;
    CCTextAlignment m_alignment;
    CCVerticalTextAlignment m_vAlignment;
    std::string     m_strFontName;
    std::string     m_strText;
    float           m_fFontSize;
};

#endif

NS_CC_END

#endif //__CCTEXTURE_CACHE_H__