axmol/cocos2dx/include/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 "CCMutableDictionary.h"

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

namespace   cocos2d {
class CCTexture2D;
class CCAsyncObject;
class CCLock;
class CCImage;

typedef void (*fpAsyncCallback)(CCTexture2D*, void*);

/** @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:
	CCMutableDictionary<std::string, CCTexture2D*> * m_pTextures;
	CCLock				*m_pDictLock;
	CCLock				*m_pContextLock;

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

public:

	CCTextureCache();
	virtual ~CCTextureCache();

	char * description(void);

	/** 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
	*/
	
	// @todo void addImageAsync(const char* filename, CCObject*target, fpAsyncCallback func);

	/* 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();

#if _POWERVR_SUPPORT_
	/** 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);

	/** Returns a Texture2D object given an PVRTC 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* addPVRTCImage(const char* fileimage);
#endif

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

#if CC_ENABLE_CACHE_TEXTTURE_DATA

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

    static void addImageTexture(CCTexture2D *tt, const char* imageFileName, CCImage::EImageFormat format);
    static void addStringTexture(CCTexture2D *tt, const char* text, CCSize dimensions, CCTextAlignment alignment, const char *fontName, float fontSize);

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

public:
    static std::list<VolatileTexture*> textures;
    static bool isReloading;

protected:
    CCTexture2D *texture;

    bool m_bIsString;

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

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

#endif

}//namespace   cocos2d 

#endif //__CCTEXTURE_CACHE_H__