kc3-lang/ftgl/src/FTBitmapGlyph.cpp

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  Commit

• Author : henry
  Date : 2001-08-05 21:35:51
  Hash : f03d965b
  Message : Made render() arg const

• src/FTBitmapGlyph.cpp

• #include	"gl.h"
  
  #include	"FTBitmapGlyph.h"
  #include	"FTGL.h"
  
  
  FTBitmapGlyph::FTBitmapGlyph( FT_Glyph glyph, int gi)
  :	FTGlyph( gi),
  	destWidth(0),
  	destHeight(0),
  	data(0)
  {
  	if( !glyph->format == ft_glyph_format_bitmap)
  	{ return;}
  	
  	// This function will always fail if the glyph's format isn't scalable????
  	FT_Error err = FT_Glyph_To_Bitmap( &glyph, ft_render_mode_mono, 0, 1);
  	if( err)
  	{return;}
  
  	FT_BitmapGlyph  bitmap = (FT_BitmapGlyph)glyph;
  	FT_Bitmap*      source = &bitmap->bitmap;
  
  	//check the pixel mode
  	//ft_pixel_mode_grays
  	    
  	int srcWidth = source->width;
  	int srcHeight = source->rows;
  	int srcPitch = source->pitch;
      
  	advance = glyph->advance.x >> 16; // this is 6 in the freetype docs!!!!!!
  
   	pos.x = bitmap->left;
  	pos.y = srcHeight - bitmap->top;
  	
     // FIXME The buffer is upside down. What about dest alignment?
      destWidth = srcWidth;
      destHeight = srcHeight;
      
      data = new unsigned char[srcPitch * destHeight];
      
      for(int y = 0; y < srcHeight; ++y)
      {
      	--destHeight;
      	for(int x = 0; x < srcPitch; ++x)
      	{
  			*( data + ( destHeight * srcPitch + x)) = *( source->buffer + ( y * srcPitch) + x);
      	}    	
      }
  
      destHeight = srcHeight;
  
  	// discard glyph image (bitmap or not)
  	// Is this the right place to do this?
  	FT_Done_Glyph( glyph );
  }
  
  
  FTBitmapGlyph::~FTBitmapGlyph()
  {
  	delete[] data;
  }
  
  
  float FTBitmapGlyph::Render( const FT_Vector& pen)
  {
  	if( data != 0 )
  	{
  		glPushClientAttrib( GL_CLIENT_PIXEL_STORE_BIT);
  		
  		// doing this every frame is a bad?
  		glPixelStorei( GL_UNPACK_LSB_FIRST, GL_FALSE);
  		glPixelStorei( GL_UNPACK_ROW_LENGTH, 0);
  		glPixelStorei( GL_UNPACK_ALIGNMENT, 1);
  
  		// Move the glyph origin
  		glBitmap( 0, 0, 0.0, 0.0, pen.x + pos.x, pen.y - pos.y, (const GLubyte *)0 );
  
  		glBitmap( destWidth, destHeight, 0.0f, 0.0, 0.0, 0.0, (const GLubyte *)data);
  
  		// Restore the glyph origin
  		glBitmap( 0, 0, 0.0, 0.0, -pen.x - pos.x, -pen.y + pos.y, (const GLubyte *)0 );
  
  		glPopClientAttrib();
  	}
  	
  	return advance;
  }