libRocket/Source/Core/BitmapFont/BM_Font.h

/*
 * This source file is part of libRocket, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://www.librocket.com
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#ifndef BITMAPFONTDEFINITIONS_H
#define BITMAPFONTDEFINITIONS_H

#include <Rocket/Core/Header.h>
#include <Rocket/Core/Types.h>
#include <Rocket/Core/Dictionary.h>
#include <set>

namespace Rocket {
namespace Core {
namespace BitmapFont {

    struct Padding
    {
        int Up,
            Right,
            Down,
            Left;
    };

    struct Spacing
    {
        int Horizontal,
            Vertical;
    };

    struct FontInfo
    {
        String FamilyName;
        String Source;
        String Directory;
        int Size;
        Font::Style Style;
        Font::Weight Weight;
        String CharsetName;
        bool IsUnicode;
        int StretchHeight;
        bool IsSmoothed;
        int SuperSamplingLevel;
        Padding FontPadding;
        Spacing FontSpacing;
        int Outline;
    };

    struct CharacterCommonInfo
    {
        int LineHeight;
        int BaseLine;
        int ScaleWidth;
        int ScaleHeight;
        int PageCount;
        bool IsPacked;
        int AlphaChanelUsage;
        int RedChanelUsage;
        int GreenChanelUsage;
        int BlueChanelUsage;
        int CharacterCount;
        int KerningCount;
    };

    struct PageInfo
    {
        int Id;
        String FileName;
    };

    struct CharacterInfo
    {
        int Id;
        int X;
        int Y;
        int Width;
        int Height;
        int XOffset;
        int YOffset;
        int Advance;
        int PageId;
        int ChannelUsed;
    };

    struct KerningInfo
    {
        int FirstCharacterId;
        int SecondCharacterId;
        int KerningAmount;
    };

    class BM_Font
    {
    public:
        FontInfo Face;
        CharacterCommonInfo CommonCharactersInfo;
        PageInfo *PagesInfo;
        CharacterInfo *CharactersInfo;
        KerningInfo *KerningsInfo;

        int BM_Helper_GetCharacterTableIndex( int unicode_code )
        {
            return BinarySearch( unicode_code, 0, CommonCharactersInfo.CharacterCount );
        }

        int BM_Helper_GetXKerning( int left_uni_id, int right_uni_id )
        {
            for ( int i = 0; i < this->CommonCharactersInfo.KerningCount; i++ )
            {
                if ( this->KerningsInfo[i].FirstCharacterId == left_uni_id && this->KerningsInfo[i].SecondCharacterId == right_uni_id )
                {
                    return this->KerningsInfo[i].KerningAmount;
                }
            }

            return 0;
        }

    private:

        int BinarySearch( int unicode_code, int min_index, int max_index )
        {
            if ( abs( max_index - min_index ) <= 1 )
            {
                if ( this->CharactersInfo[ min_index ].Id == unicode_code )
                {
                    return min_index;
                }
                else if ( this->CharactersInfo[ max_index ].Id == unicode_code )
                {
                    return max_index;
                }
                else
                {
                    return -1;
                }
            }
            else
            {
                int mid_index = ( min_index + max_index ) / 2;

                if ( this->CharactersInfo[ mid_index ].Id == unicode_code )
                {
                    return mid_index;
                }
                else if ( this->CharactersInfo[ mid_index ].Id > unicode_code )
                {
                    return BinarySearch( unicode_code, min_index, mid_index );
                }
                else
                {
                    return BinarySearch( unicode_code, mid_index, max_index );
                }
            }
        }
    };

}
}
}
#endif