TextLoader.h

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#ifndef LIBOSMSCOUT_TEXTLOADER_H
#define LIBOSMSCOUT_TEXTLOADER_H
 
/*
  This source is part of the libosmscout-map library
  Copyright (C) 2017  Fanny Monori
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <string>
 
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
 
#include <osmscoutmapopengl/OpenGLMapData.h>
#include <osmscoutmapopengl/MapOpenGLImportExport.h>
 
namespace osmscout {
 
  class OSMSCOUT_MAP_OPENGL_API CharacterTexture {
    char32_t character;
    OpenGLTextureRef texture;
    long baselineY;
    long height;
 
  public:
 
    char32_t GetCharacter() const {
      return character;
    }
 
    void SetCharacter(char32_t character) {
      this->character = character;
    }
 
    OpenGLTextureRef GetTexture() const {
      return texture;
    }
 
    void SetTexture(OpenGLTextureRef texture) {
      this->texture = texture;
    }
 
    long GetBaselineY() const {
      return baselineY;
    }
 
    void SetBaselineY(long baselineY) {
      this->baselineY = baselineY;
    }
 
    long GetHeight() const {
      return height;
    }
 
    void SetHeight(long height) {
      this->height = height;
    }
 
  };
 
  typedef std::shared_ptr<CharacterTexture> CharacterTextureRef;
 
  class OSMSCOUT_MAP_OPENGL_API TextLoader {
  private:
    bool initialized = false;
 
    FT_Library ft=nullptr;
    FT_Face face=nullptr;
 
    long defaultFontSize;
 
    long maxHeight;
    int sumWidth;
 
    std::map<std::pair<char32_t, int>, int> characterIndices;
    std::vector<osmscout::CharacterTextureRef> characters;
 
    bool LoadFace(const std::string &path, double dpi);
 
  public:
 
    TextLoader(const std::string &path, long defaultSize, double dpi);
 
    ~TextLoader();
 
    bool IsInitialized() const
    {
      return initialized;
    }

    size_t GetWidth(int index);

    int GetStartWidth(int index);

    long GetHeight();

    long GetDefaultFontSize() const;

    void SetDefaultFontSize(long defaultFontSize);

    OpenGLTextureRef CreateTexture();

    std::vector<int> AddCharactersToTextureAtlas(std::string text, double size);
  };
}
 
 
#endif //LIBOSMSCOUT_TEXTLOADER_H