gr_CharWidthsCache.h

Go to the documentation of this file.

/* AbiSource Application Framework
 * Copyright (C) 2003, 2013 Hubert Figuiere
 * 
 * This program 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; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#ifndef _GR_CHAR_WIDTHS_CACHE_H__
#define _GR_CHAR_WIDTHS_CACHE_H__

#include <map>
#include <string>

#include "ut_types.h"

class GR_Font;
class GR_CharWidths;

class ABI_EXPORT GR_CharWidthsCache
{
public:

    static GR_CharWidthsCache* getCharWidthCache()
    {
        _instantiate();
        return s_pInstance;
    }

    enum {
        CACHE_FONT_SIZE = 120
    };

    static void destroyCharWidthsCache()
    {
        if(s_pInstance)
        {
            delete s_pInstance;
            s_pInstance = NULL;
        }
    }

protected:
    typedef std::map<std::string, GR_CharWidths*> FontCache;

    FontCache::iterator addFont (const GR_Font* pFont);
    GR_CharWidths*  getWidthsForFont(const GR_Font* pFont);
    friend class GR_Font;
private:
    GR_CharWidthsCache();
    ~GR_CharWidthsCache();

    static void _instantiate(void);

    static GR_CharWidthsCache* s_pInstance;
    FontCache m_fontHash;
};


#endif