Font.hpp

// Copyright 2019, 2020 Pokitec
// All rights reserved.
 
#pragma once
 
#include "TTauri/Text/GlyphMetrics.hpp"
#include "TTauri/Text/FontGlyphIDs.hpp"
#include "TTauri/Text/gstring.hpp"
#include "TTauri/Text/FontDescription.hpp"
#include "TTauri/Foundation/Path.hpp"
#include "TTauri/Foundation/ResourceView.hpp"
#include "TTauri/Foundation/exceptions.hpp"
#include "TTauri/Foundation/required.hpp"
#include "TTauri/Foundation/URL.hpp"
#include <nonstd/span>
#include <vector>
#include <map>
 
namespace tt {
 
class Font {
public:
    Font() = default;
    virtual ~Font() = default;
    Font(Font const &) = delete;
    Font &operator=(Font const &) = delete;
    Font(Font &&) = delete;
    Font &operator=(Font &&) = delete;
 
    FontDescription description;
 
    [[nodiscard]] virtual GlyphID find_glyph(char32_t c) const noexcept = 0;
 
    [[nodiscard]] FontGlyphIDs find_glyph(Grapheme g) const noexcept;
 
    virtual std::optional<GlyphID> loadGlyph(GlyphID glyph_id, Path &path) const noexcept = 0;
 
    virtual bool loadGlyphMetrics(GlyphID glyph_id, GlyphMetrics &metrics, GlyphID lookahead_glyph_id=GlyphID{}) const noexcept = 0;
};
 
}
 
namespace tt {
 
template<>
std::unique_ptr<tt::Font> parseResource(URL const &location);
 
}