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BMF_BitmapFont.cpp

/**
 * $Id: BMF_BitmapFont.cpp,v 1.3 2002/11/25 09:52:47 mein Exp $
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * 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. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */

/**

 * $Id: BMF_BitmapFont.cpp,v 1.3 2002/11/25 09:52:47 mein Exp $
 * Copyright (C) 2001 NaN Technologies B.V.
 */

#include <string.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#if defined(WIN32) || defined(__APPLE__)
      #ifdef WIN32
        #if !defined(__CYGWIN32__)
        #pragma warning(disable:4244)
        #endif /* __CYGWIN32__ */
            #include <windows.h>
            #include <GL/gl.h>
      #else // WIN32
            // __APPLE__ is defined
            #include <AGL/gl.h>
      #endif // WIN32
#else // defined(WIN32) || defined(__APPLE__)
      #include <GL/gl.h>
#endif // defined(WIN32) || defined(__APPLE__)

#include "BMF_BitmapFont.h"


00062 BMF_BitmapFont::BMF_BitmapFont(BMF_FontData* fontData)
: m_fontData(fontData)
{
}


00068 BMF_BitmapFont::~BMF_BitmapFont(void)
{
}


00073 void BMF_BitmapFont::DrawString(char* str)
{
      GLint alignment;
      unsigned char c;
            
      glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

      while (c = (unsigned char) *str++) {
            BMF_CharData & cd = m_fontData->chars[c];
            
            if (cd.data_offset==-1) {
                  GLubyte nullBitmap = 0;
            
                  glBitmap(1, 1, 0, 0, cd.advance, 0, &nullBitmap);     
            } else {
                  GLubyte *bitmap = &m_fontData->bitmap_data[cd.data_offset];
            
                  glBitmap(cd.width, cd.height, cd.xorig, cd.yorig, cd.advance, 0, bitmap);
            }
      }

      glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
}


00099 int BMF_BitmapFont::GetStringWidth(char* str)
{
      unsigned char c;
      int length = 0;

      while (c = (unsigned char) *str++) {
            length += m_fontData->chars[c].advance;
      }
      
      return length;
}

00111 void BMF_BitmapFont::GetBoundingBox(int & xMin, int & yMin, int & xMax, int & yMax)
{
      xMin = m_fontData->xmin;
      yMin = m_fontData->ymin;
      xMax = m_fontData->xmax;
      yMax = m_fontData->ymax;
}

00119 int BMF_BitmapFont::GetTexture()
{
      int fWidth = m_fontData->xmax - m_fontData->xmin;
      int fHeight = m_fontData->ymax - m_fontData->ymin;
      
      if (fWidth>=16 || fHeight>=16) {
            return -1;
      }
      
      int cRows = 16, cCols = 16;
      int cWidth = 16, cHeight = 16;
      int iWidth = cCols*cWidth;
      int iHeight = cRows*cHeight;
      GLubyte *img = new GLubyte [iHeight*iWidth];
      GLuint texId;

      int baseLine = -(m_fontData->ymin);
      
      memset(img, 0, iHeight*iWidth);
      for (int i = 0; i<256; i++) {
            BMF_CharData & cd = m_fontData->chars[i];
            
            if (cd.data_offset != -1) {
                  int cellX = i%16;
                  int cellY = i/16;
                  
                  for (int y = 0; y<cd.height; y++) {
                        GLubyte* imgRow = &img[(cellY*cHeight + y + baseLine - cd.yorig)*iWidth];
                        GLubyte* chrRow = &m_fontData->bitmap_data[cd.data_offset + ((cd.width+7)/8)*y];

                        for (int x = 0; x<cd.width; x++) {
                              GLubyte* imgPxl = &imgRow[(cellX*cWidth + x - cd.xorig)];
                              int byteIdx = x/8;
                              int bitIdx = 7 - (x%8);
                              
                              if (chrRow[byteIdx]&(1<<bitIdx)) {
                                    imgPxl[0] = 255;
                              }
                        }
                  }
            }
      }
      
      glGenTextures(1, &texId);
      
      glBindTexture(GL_TEXTURE_2D, texId);

      glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA4, iWidth, iHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, img);
      if (glGetError()) {
            glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE4_ALPHA4, iWidth, iHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, img);
      }
      
      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
      
      delete [] img;
      
      return texId;
}

00180 void BMF_BitmapFont::DrawStringTexture(char *str, float x, float y, float z)
{
      unsigned char c;
      float pos = 0;
      
      int baseLine = -(m_fontData->ymin);

      glBegin(GL_QUADS);
      while (c = (unsigned char) *str++) {
            BMF_CharData & cd = m_fontData->chars[c];
            
            if (cd.data_offset != -1) {
                  float cellX = (c%16)/16.0;
                  float cellY = (c/16)/16.0;
            
                  glTexCoord2f(cellX + 1.0/16.0, cellY);
                  glVertex3f(x + pos + 16.0, -baseLine + y + 0.0, z);

                  glTexCoord2f(cellX + 1.0/16.0, cellY + 1.0/16.0);
                  glVertex3f(x + pos + 16.0, -baseLine + y + 16.0, z);

                  glTexCoord2f(cellX, cellY + 1.0/16.0);
                  glVertex3f(x + pos + 0.0, -baseLine + y + 16.0, z);

                  glTexCoord2f(cellX, cellY);
                  glVertex3f(x + pos + 0.0, -baseLine + y + 0.0, z);
            }
            
            pos += cd.advance;
      }
      glEnd();
}

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