kc3-lang/ftgl/src/FTLibrary.cpp

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• Author : Frank Heckenbach
  Date : 2019-02-07 22:03:32
  Hash : c261e7bd
  Message : implement LegacyOpenGLState, see README-LegacyOpenGLState

• src/FTLibrary.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   *
   * 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/FTLibrary.h"
  #include "FTCleanup.h"
  #include <stdexcept>
  
  FTLibrary& FTLibrary::Instance()
  {
      static FTLibrary ftlib;
      return ftlib;
  }
  
  
  FTLibrary::~FTLibrary()
  {
      FTCleanup::Instance()->DestroyAll();
  
      if(library != 0)
      {
          FT_Done_FreeType(*library);
  
          delete library;
          library= 0;
      }
  }
  
  
  FTLibrary::FTLibrary()
  :   library(0),
      err(0),
      LegacyOpenGLStateHandling(-1)
  {
      Initialise();
  }
  
  
  bool FTLibrary::Initialise()
  {
      if(library != 0)
          return true;
  
      library = new FT_Library;
  
      err = FT_Init_FreeType(library);
      if(err)
      {
          delete library;
          library = 0;
          return false;
      }
  
      FTCleanup::Instance();
  
      return true;
  }
  
  
  void FTLibrary::LegacyOpenGLState(bool On)
  {
    int Old = LegacyOpenGLStateHandling.exchange(On);
    if (Old >= 0 && Old != On)
      throw std::logic_error
        ("FTGL: inconsistent LegacyOpenGLState setting, see README-LegacyOpenGLState");
  }