kc3-lang/ftgl/src/FTGlyph/FTPolygonGlyph.cpp

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• Author : Frank Heckenbach
  Date : 2018-01-29 03:02:31
  Hash : 8cca0305
  Message : FTOutlineGlyphImpl, FTPolygonGlyphImpl: avoid uninizitalized vectoriser in case of error (see Debian bug #589601, 1.)

• src/FTGlyph/FTPolygonGlyph.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   * Copyright (c) 2008 Éric Beets <ericbeets@free.fr>
   * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net>
   *
   * 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.
   */
  
  #include "config.h"
  
  #include "FTGL/ftgl.h"
  
  #include "FTInternals.h"
  #include "FTPolygonGlyphImpl.h"
  #include "FTVectoriser.h"
  
  
  //
  //  FTGLPolyGlyph
  //
  
  
  FTPolygonGlyph::FTPolygonGlyph(FT_GlyphSlot glyph, float outset,
                                 bool useDisplayList) :
      FTGlyph(new FTPolygonGlyphImpl(glyph, outset, useDisplayList))
  {}
  
  
  FTPolygonGlyph::~FTPolygonGlyph()
  {}
  
  
  const FTPoint& FTPolygonGlyph::Render(const FTPoint& pen, int renderMode)
  {
      FTPolygonGlyphImpl *myimpl = dynamic_cast<FTPolygonGlyphImpl *>(impl);
      return myimpl->RenderImpl(pen, renderMode);
  }
  
  
  //
  //  FTGLPolyGlyphImpl
  //
  
  
  FTPolygonGlyphImpl::FTPolygonGlyphImpl(FT_GlyphSlot glyph, float _outset,
                                         bool useDisplayList)
  :   FTGlyphImpl(glyph),
      vectoriser(0),
      glList(0)
  {
      if(ft_glyph_format_outline != glyph->format)
      {
          err = 0x14; // Invalid_Outline
          return;
      }
  
      vectoriser = new FTVectoriser(glyph);
  
      if((vectoriser->ContourCount() < 1) || (vectoriser->PointCount() < 3))
      {
          delete vectoriser;
          vectoriser = NULL;
          return;
      }
  
  
      hscale = glyph->face->size->metrics.x_ppem * 64;
      vscale = glyph->face->size->metrics.y_ppem * 64;
      outset = _outset;
  
      if(useDisplayList)
      {
          glList = glGenLists(1);
          glNewList(glList, GL_COMPILE);
  
          DoRender();
  
          glEndList();
  
          delete vectoriser;
          vectoriser = NULL;
      }
  }
  
  
  FTPolygonGlyphImpl::~FTPolygonGlyphImpl()
  {
      if(glList)
      {
          glDeleteLists(glList, 1);
      }
      else if(vectoriser)
      {
          delete vectoriser;
      }
  }
  
  
  const FTPoint& FTPolygonGlyphImpl::RenderImpl(const FTPoint& pen,
                                                int renderMode)
  {
      (void)renderMode;
  
      glTranslatef(pen.Xf(), pen.Yf(), pen.Zf());
      if(glList)
      {
          glCallList(glList);
      }
      else if(vectoriser)
      {
          DoRender();
      }
      glTranslatef(-pen.Xf(), -pen.Yf(), -pen.Zf());
  
      return advance;
  }
  
  
  void FTPolygonGlyphImpl::DoRender()
  {
      vectoriser->MakeMesh(1.0, 1, outset);
  
      const FTMesh *mesh = vectoriser->GetMesh();
  
      for(unsigned int t = 0; t < mesh->TesselationCount(); ++t)
      {
          const FTTesselation* subMesh = mesh->Tesselation(t);
          unsigned int polygonType = subMesh->PolygonType();
  
          glBegin(polygonType);
              for(unsigned int i = 0; i < subMesh->PointCount(); ++i)
              {
                  FTPoint point = subMesh->Point(i);
                  glTexCoord2f(point.Xf() / hscale, point.Yf() / vscale);
                  glVertex3f(point.Xf() / 64.0f, point.Yf() / 64.0f, 0.0f);
              }
          glEnd();
      }
  }