dgnhelp.cpp

在Linux环境下读写DGN文件

/******************************************************************************
 * $Id: dgnhelp.cpp,v 1.12 2002/11/13 21:26:32 warmerda Exp $
 *
 * Project:  Microstation DGN Access Library
 * Purpose:  Application visible helper functions for parsing DGN information.
 * Author:   Frank Warmerdam, [e-mail]
 *
 ******************************************************************************
 * Copyright (c) 2002, Avenza Systems Inc, http://www.avenza.com/
 *
 * 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.
 ******************************************************************************
 *
 * $Log: dgnhelp.cpp,v $
 * Revision 1.12  2002/11/13 21:26:32  warmerda
 * added more documentation
 *
 * Revision 1.11  2002/11/12 19:44:17  warmerda
 * added view display
 *
 * Revision 1.10  2002/10/07 13:14:18  warmerda
 * added association id support
 *
 * Revision 1.9  2002/05/31 03:40:22  warmerda
 * added improved support for parsing attribute linkages
 *
 * Revision 1.8  2002/05/30 19:24:38  warmerda
 * add partial support for tag type 5
 *
 * Revision 1.7  2002/04/22 20:44:41  warmerda
 * added (partial) cell library support
 *
 * Revision 1.6  2002/04/16 17:56:07  warmerda
 * Initialize ch.
 *
 * Revision 1.5  2002/03/14 21:38:05  warmerda
 * removed DGN_DEBUG macro
 *
 * Revision 1.4  2002/03/12 17:07:26  warmerda
 * added tagset and tag value element support
 *
 * Revision 1.3  2002/02/22 22:18:10  warmerda
 * ensure that multi-part attributes supported for fill info
 *
 * Revision 1.2  2002/01/15 06:42:30  warmerda
 * remove stub statement
 *
 * Revision 1.1  2002/01/15 06:38:02  warmerda
 * New
 *
 */

#include "dgnlibp.h"

CPL_CVSID("$Id: dgnhelp.cpp,v 1.12 2002/11/13 21:26:32 warmerda Exp $");

static unsigned char abyDefaultPCT[256][3] = 
{
  {255,255,255},
  {0,0,255},
  {0,255,0},
  {255,0,0},
  {255,255,0},
  {255,0,255},
  {255,127,0},
  {0,255,255},
  {64,64,64},
  {192,192,192},
  {254,0,96},
  {160,224,0},
  {0,254,160},
  {128,0,160},
  {176,176,176},
  {0,240,240},
  {240,240,240},
  {0,0,240},
  {0,240,0},
  {240,0,0},
  {240,240,0},
  {240,0,240},
  {240,122,0},
  {0,240,240},
  {240,240,240},
  {0,0,240},
  {0,240,0},
  {240,0,0},
  {240,240,0},
  {240,0,240},
  {240,122,0},
  {0,225,225},
  {225,225,225},
  {0,0,225},
  {0,225,0},
  {225,0,0},
  {225,225,0},
  {225,0,225},
  {225,117,0},
  {0,225,225},
  {225,225,225},
  {0,0,225},
  {0,225,0},
  {225,0,0},
  {225,225,0},
  {225,0,225},
  {225,117,0},
  {0,210,210},
  {210,210,210},
  {0,0,210},
  {0,210,0},
  {210,0,0},
  {210,210,0},
  {210,0,210},
  {210,112,0},
  {0,210,210},
  {210,210,210},
  {0,0,210},
  {0,210,0},
  {210,0,0},
  {210,210,0},
  {210,0,210},
  {210,112,0},
  {0,195,195},
  {195,195,195},
  {0,0,195},
  {0,195,0},
  {195,0,0},
  {195,195,0},
  {195,0,195},
  {195,107,0},
  {0,195,195},
  {195,195,195},
  {0,0,195},
  {0,195,0},
  {195,0,0},
  {195,195,0},
  {195,0,195},
  {195,107,0},
  {0,180,180},
  {180,180,180},
  {0,0,180},
  {0,180,0},
  {180,0,0},
  {180,180,0},
  {180,0,180},
  {180,102,0},
  {0,180,180},
  {180,180,180},
  {0,0,180},
  {0,180,0},
  {180,0,0},
  {180,180,0},
  {180,0,180},
  {180,102,0},
  {0,165,165},
  {165,165,165},
  {0,0,165},
  {0,165,0},
  {165,0,0},
  {165,165,0},
  {165,0,165},
  {165,97,0},
  {0,165,165},
  {165,165,165},
  {0,0,165},
  {0,165,0},
  {165,0,0},
  {165,165,0},
  {165,0,165},
  {165,97,0},
  {0,150,150},
  {150,150,150},
  {0,0,150},
  {0,150,0},
  {150,0,0},
  {150,150,0},
  {150,0,150},
  {150,92,0},
  {0,150,150},
  {150,150,150},
  {0,0,150},
  {0,150,0},
  {150,0,0},
  {150,150,0},
  {150,0,150},
  {150,92,0},
  {0,135,135},
  {135,135,135},
  {0,0,135},
  {0,135,0},
  {135,0,0},
  {135,135,0},
  {135,0,135},
  {135,87,0},
  {0,135,135},
  {135,135,135},
  {0,0,135},
  {0,135,0},
  {135,0,0},
  {135,135,0},
  {135,0,135},
  {135,87,0},
  {0,120,120},
  {120,120,120},
  {0,0,120},
  {0,120,0},
  {120,0,0},
  {120,120,0},
  {120,0,120},
  {120,82,0},
  {0,120,120},
  {120,120,120},
  {0,0,120},
  {0,120,0},
  {120,0,0},
  {120,120,0},
  {120,0,120},
  {120,82,0},
  {0,105,105},
  {105,105,105},
  {0,0,105},
  {0,105,0},
  {105,0,0},
  {105,105,0},
  {105,0,105},
  {105,77,0},
  {0,105,105},
  {105,105,105},
  {0,0,105},
  {0,105,0},
  {105,0,0},
  {105,105,0},
  {105,0,105},
  {105,77,0},
  {0,90,90},
  {90,90,90},
  {0,0,90},
  {0,90,0},
  {90,0,0},
  {90,90,0},
  {90,0,90},
  {90,72,0},
  {0,90,90},
  {90,90,90},
  {0,0,90},
  {0,90,0},
  {90,0,0},
  {90,90,0},
  {90,0,90},
  {90,72,0},
  {0,75,75},
  {75,75,75},
  {0,0,75},
  {0,75,0},
  {75,0,0},
  {75,75,0},
  {75,0,75},
  {75,67,0},
  {0,75,75},
  {75,75,75},
  {0,0,75},
  {0,75,0},
  {75,0,0},
  {75,75,0},
  {75,0,75},
  {75,67,0},
  {0,60,60},
  {60,60,60},
  {0,0,60},
  {0,60,0},
  {60,0,0},
  {60,60,0},
  {60,0,60},
  {60,62,0},
  {0,60,60},
  {60,60,60},
  {0,0,60},
  {0,60,0},
  {60,0,0},
  {60,60,0},
  {60,0,60},
  {60,62,0},
  {0,45,45},
  {45,45,45},
  {0,0,45},
  {0,45,0},
  {45,0,0},
  {45,45,0},
  {45,0,45},
  {45,57,0},
  {0,45,45},
  {45,45,45},
  {0,0,45},
  {0,45,0},
  {45,0,0},
  {45,45,0},
  {45,0,45},
  {45,57,0},
  {0,30,30},
  {30,30,30},
  {0,0,30},
  {0,30,0},
  {30,0,0},
  {30,30,0},
  {30,0,30},
  {30,52,0},
  {0,30,30},
  {30,30,30},
  {0,0,30},
  {0,30,0},
  {30,0,0},
  {30,30,0},
  {30,0,30},
  {192,192,192},
  {28,0,100}
};


/************************************************************************/
/*                           DGNLookupColor()                           */
/************************************************************************/

/**
 * Translate color index into RGB values.
 *
 * If no color table has yet been encountered in the file a hard-coded
 * "default" color table will be used.  This seems to be what Microstation
 * uses as a color table when there isn't one in a DGN file but I am not
 * absolutely convinced it is appropriate.
 *
 * @param hDGN the file.
 * @param color_index the color index to lookup.
 * @param red location to put red component.
 * @param green location to put green component.
 * @param blue location to put blue component.
 *
 * @return TRUE on success or FALSE on failure.  May fail if color_index is
 * out of range.
 */

int DGNLookupColor( DGNHandle hDGN, int color_index, 
                    int * red, int * green, int * blue )

{
    DGNInfo	*psDGN = (DGNInfo *) hDGN;

    if( color_index < 0 || color_index > 255  )
        return FALSE;