ImageCache.hpp

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//
// Created by kj16609 on 9/21/23.
//
 
#pragma once
#ifndef ATLASGAMEMANAGER_IMAGECACHE_HPP
#define ATLASGAMEMANAGER_IMAGECACHE_HPP
 
#include <QPixmap>
 
#include <chrono>
#include <map>
#include <mutex>
 
namespace atlas::cache
{
    using Clock = std::chrono::steady_clock;
 
    class ImageCache
    {
        struct PixmapItem
        {
            std::chrono::time_point< std::chrono::steady_clock > last_accessed { Clock::now() };
            QPixmap pixmap;
 
            PixmapItem( QPixmap map ) : pixmap( map ) {}
 
            void operator()() { last_accessed = Clock::now(); }
 
            std::uint64_t size() const;
 
            std::uint64_t score( const std::chrono::time_point< std::chrono::steady_clock >& current_time ) const;
 
            bool operator<( const PixmapItem& other ) const { return size() < other.size(); }
        };
 
        std::recursive_mutex mtx {};
        std::multimap< std::string, PixmapItem > cache {};
        std::uint64_t max_size { 1024 * 1024 * 128 }; // 128 MB
        std::uint64_t current_size { 0 };
 
      public:

        void prune();

        void insert( const std::string& key, const QPixmap& pixmap );
 
        std::optional< QPixmap > find( std::string key );
    };
 
} // namespace atlas::cache
 
#endif //ATLASGAMEMANAGER_IMAGECACHE_HPP