imagecache.h

/*
 * Copyright (C) 2018 Microchip Technology Inc.  All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef EGT_DETAIL_IMAGECACHE_H
#define EGT_DETAIL_IMAGECACHE_H
 
#include <egt/detail/meta.h>
#include <egt/painter.h>
#include <map>
#include <memory>
#include <string>
 
namespace egt
{
inline namespace v1
{
namespace detail
{
 
class EGT_API ImageCache
{
public:
 
    shared_cairo_surface_t get(const std::string& uri,
                               float hscale = 1.0, float vscale = 1.0,
                               bool approximate = true);
 
    void clear();
 
    static shared_cairo_surface_t scale_surface(const shared_cairo_surface_t& old_surface,
            float old_width, float old_height,
            float new_width, float new_height);
 
protected:
 
    static float round(float v, float fraction);
 
    static std::string id(const std::string& name, float hscale, float vscale);
 
    std::map<std::string, shared_cairo_surface_t> m_cache;
};
 
EGT_API ImageCache& image_cache();
 
}
}
}
 
#endif