kc3-lang/ftgl/src/FTPolyGlyph.cpp

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• Author : sammy
  Date : 2008-04-21 21:48:03
  Hash : 7e74380f
  Message : * Inset/outset contour support for fonts, by Eric Beets. For now, only contours with exactly the same number of points are generated.

• src/FTPolyGlyph.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   *               2008 Éric Beets <ericbeets@free.fr>
   *
   * 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.
   *
   * Alternatively, you can redistribute and/or modify this software under
   * the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License,
   * or (at your option) any later version.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this software; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA.
   */
  
  #include "config.h"
  
  #include "FTPolyGlyph.h"
  #include "FTVectoriser.h"
  
  
  FTPolyGlyph::FTPolyGlyph(FT_GlyphSlot glyph, float outset, bool useDisplayList)
  :   FTGlyph( glyph),
      glList(0)
  {
      if( ft_glyph_format_outline != glyph->format)
      {
          err = 0x14; // Invalid_Outline
          return;
      }
  
      FTVectoriser vectoriser(glyph, outset * 64.0f);
  
      if(( vectoriser.ContourCount() < 1) || ( vectoriser.PointCount() < 3))
      {
          return;
      }
      
      unsigned int horizontalTextureScale = glyph->face->size->metrics.x_ppem * 64;
      unsigned int verticalTextureScale = glyph->face->size->metrics.y_ppem * 64;        
          
      vectoriser.MakeMesh(1.0, 1);
      
      if( useDisplayList)
      {
          glList = glGenLists( 1);
          glNewList( glList, GL_COMPILE);
      }
  
      const FTMesh* mesh = vectoriser.GetMesh();
      for( unsigned int index = 0; index < mesh->TesselationCount(); ++index)
      {
          const FTTesselation* subMesh = mesh->Tesselation( index);
          unsigned int polygonType = subMesh->PolygonType();
  
          glBegin( polygonType);
              for( unsigned int pointIndex = 0; pointIndex < subMesh->PointCount(); ++pointIndex)
              {
                  FTPoint point = subMesh->Point(pointIndex);
                  
                  glTexCoord2f( point.X() / horizontalTextureScale,
                                point.Y() / verticalTextureScale);
                  
                  glVertex3f( point.X() / 64.0f,
                              point.Y() / 64.0f,
                              0.0f);
              }
          glEnd();
      }
  
      if(useDisplayList)
      {
          glEndList();
      }
  }
  
  
  FTPolyGlyph::~FTPolyGlyph()
  {
      glDeleteLists( glList, 1);
  }
  
  
  const FTPoint& FTPolyGlyph::Render(const FTPoint& pen)
  {
      if(glList)
      {
          glTranslatef(pen.X(), pen.Y(), 0.0f);
          glCallList(glList);
          glTranslatef(-pen.X(), -pen.Y(), 0.0f);
      }
      
      return advance;
  }