kc3-lang/ftgl/src/FTTextureGlyph.cpp

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• Author : sammy
  Date : 2008-04-04 12:43:38
  Hash : 7c358859
  Message : * Generate a config.h file instead of passing all defines in the compiler command line. * "make install" now properly installs the includes, the documentation and the .pc file. * Generate a shared library.

• src/FTTextureGlyph.cpp

• #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;
  }