axmol/core/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.
Copyright (c) 2020 C4games Ltd.
Copyright (c) 2021-2022 Bytedance Inc.

https://axis-project.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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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 AX_ENABLE_CACHE_TEXTURE_DATA
#    include <list>
#endif

NS_AX_BEGIN

/**
 * @addtogroup _2d
 * @{
 */
/*
 * From version 3.0, TextureCache will never be 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 AX_DLL TextureCache : public Ref
{
public:
    // ETC1 ALPHA supports.
    static void setETC1AlphaFileSuffix(std::string_view 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, .jpeg, .pvr.
     @param filepath The file path.
    */
    Texture2D* addImage(std::string_view filepath);
    Texture2D* addImage(std::string_view filepath, PixelFormat format);

    /** 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 offthread, 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 The file path.
     @param callback A callback function would be invoked after the image is loaded.
     @since v0.8
     
     @remark Please don't invoke Texture2D::setDefaultAlphaPixelFormat in main GL thread before invoke this API.
    */
    virtual void addImageAsync(std::string_view filepath, const std::function<void(Texture2D*)>& callback);

    void addImageAsync(std::string_view path,
                       const std::function<void(Texture2D*)>& callback,
                       std::string_view 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(std::string_view 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, std::string_view key);
    Texture2D* addImage(Image* image, std::string_view key, PixelFormat format);

    /** 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(std::string_view key) const;

    /** 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(std::string_view 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(std::string_view key);

    /** Output to AXLOG 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(std::string_view srcName, std::string_view dstName);

private:
    void addImageAsyncCallBack(float dt);
    void loadImage();
    void parseNinePatchImage(Image* image, Texture2D* texture, std::string_view 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;

    hlookup::string_map<Texture2D*> _textures;

    static std::string s_etc1AlphaFileSuffix;
};

#if AX_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;
    Vec2 _textureSize;
    backend::PixelFormat _pixelFormat;

    std::string _fileName;

    std::string _text;
    FontDefinition _fontDefinition;
};

class AX_DLL VolatileTextureMgr
{
public:
    static void addImageTexture(Texture2D* tt, std::string_view imageFileName);
    static void addStringTexture(Texture2D* tt, const char* text, const FontDefinition& fontDefinition);
    static void addDataTexture(Texture2D* tt,
                               void* data,
                               int dataLen,
                               backend::PixelFormat pixelFormat,
                               const Vec2& contentSize);
    static void addImage(Texture2D* tt, Image* image);
    static void removeTexture(Texture2D* t);
    static void reloadAllTextures();

public:
    static std::list<VolatileTexture*> _textures;
    static bool _isReloading;

    // find VolatileTexture by Texture2D*
    // if not found, create a new one
    static VolatileTexture* findVolotileTexture(Texture2D* tt);

private:
    static void reloadTexture(Texture2D* texture, std::string_view filename, backend::PixelFormat pixelFormat);
};

#endif

// end of textures group
/// @}

NS_AX_END

#endif  //__CCTEXTURE_CACHE_H__