fonts.hpp

Go to the documentation of this file.

/* Copyright (c) 2005-2009,2011 Taneli Kalvas. All rights reserved.
 *
 * You can redistribute this software and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this library (file "COPYING" included in the package);
 * if not, write to the Free Software Foundation, Inc., 51 Franklin
 * Street, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * If you have questions about your rights to use or distribute this
 * software, please contact Berkeley Lab's Technology Transfer
 * Department at TTD@lbl.gov. Other questions, comments and bug
 * reports should be sent directly to the author via email at
 * taneli.kalvas@jyu.fi.
 * 
 * NOTICE. This software was developed under partial funding from the
 * U.S.  Department of Energy.  As such, the U.S. Government has been
 * granted for itself and others acting on its behalf a paid-up,
 * nonexclusive, irrevocable, worldwide license in the Software to
 * reproduce, prepare derivative works, and perform publicly and
 * display publicly.  Beginning five (5) years after the date
 * permission to assert copyright is obtained from the U.S. Department
 * of Energy, and subject to any subsequent five (5) year renewals,
 * the U.S. Government is granted for itself and others acting on its
 * behalf a paid-up, nonexclusive, irrevocable, worldwide license in
 * the Software to reproduce, prepare derivative works, distribute
 * copies to the public, perform publicly and display publicly, and to
 * permit others to do so.
 */

#ifndef FONTS_HPP
#define FONTS_HPP 1


#include <string>
#include <vector>
#include <cairo.h>
#include <fontconfig/fontconfig.h>
#include <ft2build.h>
#include FT_FREETYPE_H



class Font
{
    cairo_font_face_t   *_cff;
    FcPattern           *_pmatch;

    std::string          _family;
    cairo_font_slant_t   _slant;   
    cairo_font_weight_t  _weight;  
public:

    Font( FcPattern *pat );
    Font( const std::string &family );
    Font( const std::string &family, cairo_font_slant_t slant, 
          cairo_font_weight_t weight );
    Font( const Font &font );

    Font &operator=( const Font &font );

    ~Font();

    std::string family( void ) const;
    cairo_font_slant_t slant( void ) const;
    cairo_font_weight_t weight( void ) const;
    cairo_font_face_t *font_face( void ) const;
    FcPattern *fcpattern( void ) const;

    void load( class FontLib &fontlib );

};


class FontLib
{

    FT_Library         _ft;
    FcConfig          *_fc;

    std::vector<Font>  _search;
    std::vector<Font>  _loaded;

    int get_font_matrix( cairo_t *cairo, cairo_matrix_t *matrix, cairo_matrix_t *orig_matrix );
    int process_substr( cairo_t *cairo, const std::string &str, cairo_text_extents_t *extents, 
                        double x0, double y0, double &x, double &y );
    void process( cairo_t *cairo, const std::string &str, cairo_text_extents_t *extents, double &x, double &y );

public:

    FontLib();

    ~FontLib();

    struct Symbolname {
        const char *name;
        const char *ucode;
    };
    
    static void combine_extents( cairo_text_extents_t *extents1, double x1, double y1,
                                 const cairo_text_extents_t *extents2, double x2, double y2 );

    static const Symbolname symbols[];


    FcConfig *fc( void ) { return( _fc ); }


    void push_auto_search_font( const std::string &family );
    int pop_auto_search_font( void );


    
    std::string family( void ) const;
    cairo_font_slant_t slant( void ) const;
    cairo_font_weight_t weight( void ) const;
    cairo_font_face_t *font_face( void ) const;
    FcPattern *fcpattern( void ) const;


    void push_font( FcPattern *pat );
    void push_font( const std::string &family, cairo_font_slant_t slant, 
                    cairo_font_weight_t weight );
    int pop_font( void );


    void text_extents( cairo_t *cairo, const std::string &str, cairo_text_extents_t *extents );

    void draw_text( cairo_t *cairo, const std::string &str, double &x, double &y );

};


extern FontLib fontlib;


#endif