gui_layered_fade.h

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#pragma once
 
#include <gui_core/gui_base_types.h>
 
#include <cstdint>
#include <memory>
#include <span>
#include <unordered_map>
 
namespace tachyon
{

    class LayeredFades
    {
    public:
        LayeredFades();
        ~LayeredFades();
        LayeredFades(const LayeredFades&) = delete;
        LayeredFades& operator=(const LayeredFades&) = delete;

        uint32_t Show(std::span<const uint8_t> bgra, int2 size, IntRect screenRect, float opacity);
        void     Move(uint32_t fade, IntRect screenRect, float opacity);
        void     End(uint32_t fade);
        size_t   Count() const;
 
    private:
        struct Fade;
        std::unordered_map<uint32_t, std::unique_ptr<Fade>> m_fades;
        uint32_t m_next = 1;
    };

}