Font.h

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#pragma once
 
#include <cstdint>
#include <string>
#include <unordered_map>
 
namespace eve::font {
class FontData;
}
 
namespace eve::graphics {
 
class Graphics;
class Texture;
 
uint32_t nextCodepointUtf8(const std::string &text, size_t &i);
 
class Font {
public:
    static std::string defaultCharset();
 
    Font(Graphics *gfx, font::FontData *data, std::string charset = defaultCharset());
    ~Font();
 
    Font(const Font &)            = delete;
    Font &operator=(const Font &) = delete;
 
    font::FontData *getData() const { return data; }
    Texture        *getTexture() const { return atlas; }
 
    float getHeight() const;
    float getAscent() const;
    float getBaseline() const;
 
    float getWidth(const std::string &text) const;
 
    bool hasGlyph(int codepoint) const;
 
    struct Glyph {
        float u0 = 0.f, v0 = 0.f, u1 = 0.f, v1 = 0.f;  // atlas UV rect (empty if width/height == 0)
        int   width = 0, height = 0;                    // glyph bitmap size, px
        int   bearingX = 0, bearingY = 0;
        int   advance = 0;
    };
 
    const Glyph *findGlyph(int codepoint) const;
 
private:
    void buildAtlas(const std::string &charset);
 
    font::FontData                   *data  = nullptr;
    Texture                          *atlas = nullptr;
    std::unordered_map<int, Glyph> glyphs;
};
 
}  // namespace eve::graphics