Blit an area within a widget
int PtBlit( PtWidget_t *widget, PhRect_t const *source, PhPoint_t const *delta );
This function blits the area that's defined by the PhRect_t structure pointed to by source (relative to the widget's origin) by an offset specified by the PhPoint_t structure pointed to by delta. Effects of the blit are limited to only the visible portions of the widget's canvas.
PhBlit(), PhPoint_t, PhRect_t, PtClippedBlit()