Font.h

// Copyright 2022 ShenMian
// License(Apache-2.0)
 
#pragma once
 
#include "Core/Image.h"
#include <filesystem>
#include <unordered_map>
 
struct FT_FaceRec_;
typedef struct FT_FaceRec_* FT_Face;
 
class Font
{
public:
    struct Glyph
    {
        Image    image;
        Vector2i advance;
    };
 
    Font(const std::filesystem::path& path);
    virtual ~Font();
 
    void load(const std::filesystem::path& path);
 
    Glyph get_glyph(unsigned long code, uint16_t size);
 
    static void init();
    static void deinit();
 
private:
    void     set_pixel_size(uint16_t size);
    uint16_t get_pixel_size() const;
 
    std::unordered_map<uint64_t, Glyph> glyph_cache_;
 
    FT_Face handle_;
};