India/cocos2d-x/cocos/renderer/CCTextureCache.h

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

http://www.cocos2d-x.org

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

#ifndef __CCTEXTURE_CACHE_H__
#define __CCTEXTURE_CACHE_H__

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

#include "base/CCRef.h"
#include "renderer/CCTexture2D.h"
#include "platform/CCImage.h"

#if CC_ENABLE_CACHE_TEXTURE_DATA
    #include <list>
#endif

NS_CC_BEGIN

/**
 * @addtogroup _2d
 * @{
 */
/*
* From version 3.0, TextureCache will never to treated as a singleton, it will be owned by director.
* All call by TextureCache::getInstance() should be replaced by Director::getInstance()->getTextureCache().
*/

/** @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 Ref
{
public:
    /** Returns the shared instance of the cache. */
    CC_DEPRECATED_ATTRIBUTE static TextureCache * getInstance();

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

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

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

    /** Reload all textures.
    Should not call it, called by frame work.
    Now the function do nothing, use VolatileTextureMgr::reloadAllTextures.
     */
    CC_DEPRECATED_ATTRIBUTE static void reloadAllTextures();

    // ETC1 ALPHA supports.
    static void setETC1AlphaFileSuffix(const std::string& suffix);
    static std::string getETC1AlphaFileSuffix();

public:
    /**
     * @js ctor
     */
    TextureCache();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~TextureCache();
    /**
     * @js NA
     * @lua NA
     */
    virtual std::string getDescription() const;

    // Dictionary* snapshotTextures();

    /** Returns a Texture2D object given an filename.
    * If the filename 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.
     @param filepath A null terminated string.
    */
    Texture2D* addImage(const std::string &filepath);

    /** 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
     @param filepath A null terminated string.
     @param callback A callback function would be invoked after the image is loaded.
     @since v0.8
    */
    virtual void addImageAsync(const std::string &filepath, const std::function<void(Texture2D*)>& callback);
    
    void addImageAsync(const std::string &path, const std::function<void(Texture2D*)>& callback, const std::string& callbackKey );

    /** Unbind a specified bound image asynchronous callback.
     * In the case an object who was bound to an image asynchronous callback was destroyed before the callback is invoked,
     * the object always need to unbind this callback manually.
     * @param filename It's the related/absolute path of the file image.
     * @since v3.1
     */
    virtual void unbindImageAsync(const std::string &filename);
    
    /** Unbind all bound image asynchronous load callbacks.
     * @since v3.1
     */
    virtual void unbindAllImageAsync();

    /** Returns a Texture2D object given an 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.
    * @param key 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* addImage(Image *image, const std::string &key);
    CC_DEPRECATED_ATTRIBUTE Texture2D* addUIImage(Image *image, const std::string& key) { return addImage(image,key); }

    /** Returns an already created texture. Returns nil if the texture doesn't exist.
    @param key It's the related/absolute path of the file image.
    @since v0.99.5
    */
    Texture2D* getTextureForKey(const std::string& key) const;
    CC_DEPRECATED_ATTRIBUTE Texture2D* textureForKey(const std::string& key) const { return getTextureForKey(key); }

    /** Reload texture from the image file.
    * If the file image hasn't loaded before, load it.
    * Otherwise the texture will be reloaded from the file image.
    * @param fileName It's the related/absolute path of the file image.
    * @return True if the reloading is succeed, otherwise return false.
    */
    bool reloadTexture(const std::string& fileName);

    /** 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.
    @param key It's the related/absolute path of the file image.
    @since v0.99.4
    */
    void removeTextureForKey(const std::string &key);

    /** 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
    */
    std::string getCachedTextureInfo() const;

    //Wait for texture cache to quit before destroy instance.
    /**Called by director, please do not called outside.*/
    void waitForQuit();

    /**
     * Get the file path of the texture
     *
     * @param texture A Texture2D object pointer.
     *
     * @return The full path of the file.
     */
    std::string getTextureFilePath(Texture2D* texture) const;

    /** Reload texture from a new file.
    * This function is mainly for editor, won't suggest use it in game for performance reason.
    *
    * @param srcName Original texture file name.
    * @param dstName New texture file name.
    *
    * @since v3.10
    */
    void renameTextureWithKey(const std::string& srcName, const std::string& dstName);


private:
    void addImageAsyncCallBack(float dt);
    void loadImage();
    void parseNinePatchImage(Image* image, Texture2D* texture, const std::string& path);
public:
protected:
    struct AsyncStruct;
    
    std::thread* _loadingThread;

    std::deque<AsyncStruct*> _asyncStructQueue;
    std::deque<AsyncStruct*> _requestQueue;
    std::deque<AsyncStruct*> _responseQueue;

    std::mutex _requestMutex;
    std::mutex _responseMutex;
    
    std::condition_variable _sleepCondition;

    bool _needQuit;

    int _asyncRefCount;

    std::unordered_map<std::string, Texture2D*> _textures;

    static std::string s_etc1AlphaFileSuffix;
};

#if CC_ENABLE_CACHE_TEXTURE_DATA

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

private:
    VolatileTexture(Texture2D *t);
    /**
     * @js NA
     * @lua NA
     */
    ~VolatileTexture();

protected:
    friend class  VolatileTextureMgr;
    Texture2D *_texture;
    
    Image *_uiImage;

    ccCachedImageType _cashedImageType;

    void *_textureData;
    int  _dataLen;
    Size _textureSize;
    Texture2D::PixelFormat _pixelFormat;

    std::string _fileName;

    bool                      _hasMipmaps;
    Texture2D::TexParams      _texParams;
    std::string               _text;
    FontDefinition            _fontDefinition;
};

class CC_DLL VolatileTextureMgr
{
public:
    static void addImageTexture(Texture2D *tt, const std::string& imageFileName);
    static void addStringTexture(Texture2D *tt, const char* text, const FontDefinition& fontDefinition);
    static void addDataTexture(Texture2D *tt, void* data, int dataLen, Texture2D::PixelFormat pixelFormat, const Size& contentSize);
    static void addImage(Texture2D *tt, Image *image);

    static void setHasMipmaps(Texture2D *t, bool hasMipmaps);
    static void setTexParameters(Texture2D *t, const Texture2D::TexParams &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);
    static void reloadTexture(Texture2D* texture, const std::string& filename, Texture2D::PixelFormat pixelFormat);
};

#endif

// end of textures group
/// @}

NS_CC_END

#endif //__CCTEXTURE_CACHE_H__