kc3-lang/ftgl/src/FTFont/FTPixmapFont.cpp

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

• src/FTFont/FTPixmapFont.cpp

• /*
   * FTGL - OpenGL font library
   *
   * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
   * 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 "FTPixmapFontImpl.h"
  #include "FTGL/FTLibrary.h"
  
  
  //
  //  FTPixmapFont
  //
  
  
  FTPixmapFont::FTPixmapFont(char const *fontFilePath) :
      FTFont(new FTPixmapFontImpl(this, fontFilePath))
  {}
  
  
  FTPixmapFont::FTPixmapFont(const unsigned char *pBufferBytes,
                             size_t bufferSizeInBytes) :
      FTFont(new FTPixmapFontImpl(this, pBufferBytes, bufferSizeInBytes))
  {}
  
  
  FTPixmapFont::~FTPixmapFont()
  {}
  
  
  FTGlyph* FTPixmapFont::MakeGlyph(FT_GlyphSlot ftGlyph)
  {
      return new FTPixmapGlyph(ftGlyph);
  }
  
  
  //
  //  FTPixmapFontImpl
  //
  
  
  FTPixmapFontImpl::FTPixmapFontImpl(FTFont *ftFont, const char* fontFilePath)
  : FTFontImpl(ftFont, fontFilePath)
  {
      load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
  }
  
  
  FTPixmapFontImpl::FTPixmapFontImpl(FTFont *ftFont,
                                     const unsigned char *pBufferBytes,
                                     size_t bufferSizeInBytes)
  : FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes)
  {
      load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
  }
  
  
  template <typename T>
  inline FTPoint FTPixmapFontImpl::RenderI(const T* string, const int len,
                                           FTPoint position, FTPoint spacing,
                                           int renderMode)
  {
      // Protect GL_TEXTURE_2D, glPixelTransferf() and optionally GL_BLEND
      glPushAttrib(GL_ENABLE_BIT | GL_PIXEL_MODE_BIT | GL_COLOR_BUFFER_BIT
                    | GL_POLYGON_BIT);
  
      // Protect glPixelStorei() calls (made by FTPixmapGlyphImpl::RenderImpl).
      glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  
      // Needed on OSX
      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  
      if(FTLibrary::Instance().GetLegacyOpenGLStateSet())
        {
          glEnable(GL_BLEND);
          /*
           * Note: This is the historic legacy behaviour.
           *
           * A better blending function (see
           * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742469) is:
           *
           *   glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
           *                       GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
           *
           * To use it, set
           *
           *   FTLibrary::Instance().LegacyOpenGLState(false);
           *
           * and set GL_BLEND and the blending function yourself.
           */
          glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        }
  
      glDisable(GL_TEXTURE_2D);
  
      GLfloat ftglColour[4];
      glGetFloatv(GL_CURRENT_RASTER_COLOR, ftglColour);
  
      glPixelTransferf(GL_RED_SCALE, ftglColour[0]);
      glPixelTransferf(GL_GREEN_SCALE, ftglColour[1]);
      glPixelTransferf(GL_BLUE_SCALE, ftglColour[2]);
      glPixelTransferf(GL_ALPHA_SCALE, ftglColour[3]);
  
      FTPoint tmp = FTFontImpl::Render(string, len,
                                       position, spacing, renderMode);
  
      glPopClientAttrib();
      glPopAttrib();
  
      return tmp;
  }
  
  
  FTPoint FTPixmapFontImpl::Render(const char * string, const int len,
                                   FTPoint position, FTPoint spacing,
                                   int renderMode)
  {
      return RenderI(string, len, position, spacing, renderMode);
  }
  
  
  FTPoint FTPixmapFontImpl::Render(const wchar_t * string, const int len,
                                   FTPoint position, FTPoint spacing,
                                   int renderMode)
  {
      return RenderI(string, len, position, spacing, renderMode);
  }