kc3-lang/ftgl/src/FTTextureGlyph.cpp

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  Commit

• Author : henry
  Date : 2002-12-31 04:07:34
  Hash : 934106a4
  Message : Fixed alignment issues for bitmap and texture glyphs

• src/FTTextureGlyph.cpp

• #include    "FTTextureGlyph.h"
  
  
  FTTextureGlyph::FTTextureGlyph( FT_Glyph glyph, int id, int xOffset, int yOffset, GLsizei width, GLsizei height)
  :   FTGlyph( glyph),
      destWidth(0),
      destHeight(0),
      glTextureID(id),
      activeTextureID(0)
  {
      err = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_normal, 0, 1);
      if( err || glyph->format != ft_glyph_format_bitmap)
      {
          return;
      }
  
      FT_BitmapGlyph  bitmap = ( FT_BitmapGlyph)glyph;
      FT_Bitmap*      source = &bitmap->bitmap;
  
      destWidth  = source->width;
      destHeight = source->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, source->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 = bitmap->left;
      pos.y = bitmap->top;
      
      FT_Done_Glyph( glyph);
  }
  
  
  FTTextureGlyph::~FTTextureGlyph()
  {}
  
  
  float FTTextureGlyph::Render( const FTPoint& pen)
  {
      glGetIntegerv( GL_TEXTURE_2D_BINDING_EXT, &activeTextureID);
      if( activeTextureID != glTextureID)
      {
          glBindTexture( GL_TEXTURE_2D, (GLuint)glTextureID);
      }
      
      glBegin( GL_QUADS);
          glTexCoord2f( uv[0].x, uv[0].y);
          glVertex2f( pen.x + pos.x,             pen.y + pos.y);
  
          glTexCoord2f( uv[0].x, uv[1].y);
          glVertex2f( pen.x + pos.x,             pen.y + pos.y - destHeight);
  
          glTexCoord2f( uv[1].x, uv[1].y);
          glVertex2f( pen.x + destWidth + pos.x, pen.y + pos.y - destHeight);
          
          glTexCoord2f( uv[1].x, uv[0].y);
          glVertex2f( pen.x + destWidth + pos.x, pen.y + pos.y);
      glEnd();
  
      return advance;
  }