truetypefontcache.h

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRUETYPEFONTCACHE_H
#define TRUETYPEFONTCACHE_H
 
#include "../fontcache.h"
 
 
static const int MAX_FONT_SIZE = 72; 
 
static const uint8_t FACE_COLOUR = 1;
static const uint8_t SHADOW_COLOUR = 2;
 
class TrueTypeFontCache : public FontCache {
protected:
  static constexpr int MAX_GLYPH_DIM = 256;          
  static constexpr uint MAX_FONT_MIN_REC_SIZE = 20u; 
 
  int req_size;  
  int used_size; 
 
  struct GlyphEntry {
    std::unique_ptr<uint8_t[]> data; 
    uint8_t width = 0; 
 
    Sprite *GetSprite() { return reinterpret_cast<Sprite *>(data.get()); }
  };
 
  std::unordered_map<GlyphID, GlyphEntry> glyph_to_sprite_map{};
 
  GlyphEntry *GetGlyphPtr(GlyphID key);
  GlyphEntry &SetGlyphPtr(GlyphID key, GlyphEntry &&glyph);
 
  virtual const Sprite *InternalGetGlyph(GlyphID key, bool aa) = 0;
 
public:
  TrueTypeFontCache(FontSize fs, int pixels);
  virtual ~TrueTypeFontCache();
  int GetFontSize() const override { return this->used_size; }
  void SetUnicodeGlyph(char32_t key, SpriteID sprite) override { this->parent->SetUnicodeGlyph(key, sprite); }
  void InitializeUnicodeGlyphMap() override { this->parent->InitializeUnicodeGlyphMap(); }
  const Sprite *GetGlyph(GlyphID key) override;
  void ClearFontCache() override;
  uint GetGlyphWidth(GlyphID key) override;
  bool GetDrawGlyphShadow() override;
  bool IsBuiltInFont() override { return false; }
};
 
#endif /* TRUETYPEFONTCACHE_H */