The PostScript driver supports arbitrary scaling of bitmap images. This means
applications can call the StretchBlt function without GDI intercepting the call
and carrying out the scaling on its own. With StretchBlt implemented in the
PostScript driver, the source bitmap is transferred directly to the printer and stretched using the PostScript imagemask operator. A run-length encoding (RLE) compression scheme has also been implemented to reduce the amount of data that needs to be transferred to the printer.