Font.h

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/* This file is part of the Zenipex Library (zenilib).
 * Copyright (C) 2011 Mitchell Keith Bloch (bazald).
 *
 * zenilib 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 3 of the License, or
 * (at your option) any later version.
 *
 * zenilib 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 zenilib.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ZENI_FONT_H
#define ZENI_FONT_H

#include <Zeni/Color.h>
#include <Zeni/Coordinate.h>
#include <Zeni/Core.h>
#include <Zeni/Image.h>
#include <Zeni/String.h>

#include <memory>

#include <Zeni/Define.h>

typedef struct FT_FaceRec_* FT_Face;

namespace Zeni {

  struct Color;
  class ZENI_GRAPHICS_DLL Video;
  class ZENI_GRAPHICS_DLL Video_GL_Fixed;
  class ZENI_GRAPHICS_DLL Video_GL_Shader;
  class ZENI_GRAPHICS_DLL Video_DX9;
  class ZENI_GRAPHICS_DLL Texture;

  enum JUSTIFY {ZENI_LEFT = 0, ZENI_CENTER = 1, ZENI_RIGHT = 2};

  class ZENI_GRAPHICS_DLL Font {
    Font(const Font &);
    Font & operator=(const Font &);

  public:
    Font(); 
    Font(const float &glyph_height,
         const float &virtual_screen_height,
         const String &font_name = "Untitled Font"); 
    virtual ~Font() {}

    inline const String & get_name() const; 
    inline float get_text_height() const; 
    virtual float get_text_width(const String &text) const = 0; 
    inline float get_virtual_screen_height() const; 

    virtual void render_text(const String &text, const Point2f &position,
      const Color &color, const JUSTIFY &justify = ZENI_DEFAULT_JUSTIFY) const = 0;
    virtual void render_text(const String &text, const Point3f &position, const Vector3f &right, const Vector3f &down,
      const Color &color, const JUSTIFY &justify = ZENI_DEFAULT_JUSTIFY) const = 0;

  private:
    float m_glyph_height;
    float m_virtual_screen_height;
    String m_font_name;
  };

  class ZENI_GRAPHICS_DLL Font_FT : public Font {
    Font_FT(const Font_FT &);
    Font_FT & operator=(const Font_FT &);

    struct ZENI_GRAPHICS_DLL Glyph {
      Glyph();
      Glyph(FT_Face &face,
            const char &c,
            const int &ascent,
            const float &vratio,
            const Point2i &position,
            const Point2i &total_size
      );

      inline float get_glyph_width() const;

      inline void render(Video &vr, const Point2f &position, const float &vratio) const;
      inline void render(Video &vr, const Point3f &position, const Vector3f &right, const Vector3f &down) const;

    private:
      float m_glyph_width;
      Point2f m_upper_left_point, m_lower_right_point;
      Point2f m_upper_left_texel, m_lower_right_texel;
    };

  public:
    Font_FT(); 
    Font_FT(const String &filepath,
            const float &glyph_height,
            const float &virtual_screen_height); 

    virtual float get_text_width(const String &text) const; 

    virtual void render_text(const String &text, const Point2f &position,
      const Color &color, const JUSTIFY &justify = ZENI_LEFT) const;
    virtual void render_text(const String &text, const Point3f &position, const Vector3f &right, const Vector3f &down,
      const Color &color, const JUSTIFY &justify = ZENI_DEFAULT_JUSTIFY) const;

  private:
    void init(const String &filepath);

    int next_power_of_two(const int &value);
    Image gen_glyph(FT_Face &face, const char &ch);

#ifdef _WINDOWS
#pragma warning( push )
#pragma warning( disable : 4251 )
#endif
    std::vector<Glyph> m_glyph;
    std::auto_ptr<Texture> m_texture;
#ifdef _WINDOWS
#pragma warning( pop )
#endif
    int m_ascent;

    float m_font_height;
    float m_vratio;
  };

  struct ZENI_GRAPHICS_DLL Font_Type_Unsupported : Error {
    Font_Type_Unsupported(const String &filename) : Error("Unsupported Font Type: ") 
    {msg += filename;}
  };

  struct ZENI_GRAPHICS_DLL Font_Init_Failure : Error {
    Font_Init_Failure() : Error("Zeni Font Initialization Failure!") {}
  };

}

#include <Zeni/Undefine.h>

#endif