kc3-lang/ftgl/src/FTTextureGlyph.cpp

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• Author : sammy
  Date : 2008-04-12 22:44:48
  Hash : 141112c4
  Message : * Add licensing information to all files in the library.

• src/FTTextureGlyph.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.
   *
   * 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 "FTTextureGlyph.h"
  
  GLint FTTextureGlyph::activeTextureID = 0;
   
  FTTextureGlyph::FTTextureGlyph( FT_GlyphSlot glyph, int id, int xOffset, int yOffset, GLsizei width, GLsizei height)
  :   FTGlyph( glyph),
      destWidth(0),
      destHeight(0),
      glTextureID(id)
  {
      err = FT_Render_Glyph( glyph, FT_RENDER_MODE_NORMAL);
      if( err || glyph->format != ft_glyph_format_bitmap)
      {
          return;
      }
  
      FT_Bitmap      bitmap = glyph->bitmap;
  
      destWidth  = bitmap.width;
      destHeight = bitmap.rows;
      
      if( destWidth && destHeight)
      {
          glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT);
          glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE);
          glPixelStorei( GL_UNPACK_ROW_LENGTH, 0);
          glPixelStorei( GL_UNPACK_ALIGNMENT, 1);
  
          glBindTexture( GL_TEXTURE_2D, glTextureID);
          glTexSubImage2D( GL_TEXTURE_2D, 0, xOffset, yOffset, destWidth, destHeight, GL_ALPHA, GL_UNSIGNED_BYTE, bitmap.buffer);
  
          glPopClientAttrib();
      }
  
  
  //      0    
  //      +----+
  //      |    |
  //      |    |
  //      |    |
  //      +----+
  //           1
      
      uv[0].X( static_cast<float>(xOffset) / static_cast<float>(width));
      uv[0].Y( static_cast<float>(yOffset) / static_cast<float>(height));
      uv[1].X( static_cast<float>( xOffset + destWidth) / static_cast<float>(width));
      uv[1].Y( static_cast<float>( yOffset + destHeight) / static_cast<float>(height));
      
      pos.X( glyph->bitmap_left);
      pos.Y( glyph->bitmap_top);
  }
  
  
  FTTextureGlyph::~FTTextureGlyph()
  {}
  
  
  const FTPoint& FTTextureGlyph::Render( const FTPoint& pen)
  {
      if( activeTextureID != glTextureID)
      {
          glBindTexture( GL_TEXTURE_2D, (GLuint)glTextureID);
          activeTextureID = glTextureID;
      }
      
      glTranslatef( pen.X(),  pen.Y(), 0.0f);
  
      glBegin( GL_QUADS);
          glTexCoord2f( uv[0].X(), uv[0].Y());
          glVertex2f( pos.X(), pos.Y());
  
          glTexCoord2f( uv[0].X(), uv[1].Y());
          glVertex2f( pos.X(), pos.Y() - destHeight);
  
          glTexCoord2f( uv[1].X(), uv[1].Y());
          glVertex2f( destWidth + pos.X(), pos.Y() - destHeight);
          
          glTexCoord2f( uv[1].X(), uv[0].Y());
          glVertex2f( destWidth + pos.X(), pos.Y());
      glEnd();
  
      return advance;
  }