ptyx.h: * on a screen is screen->max_row + 1, and similarly for columns.
ptyx.h: * One is the set of flags that can go in screen->buf attributes
ptyx.h: * term->flags and screen->save_modes.  This need only fit in an unsigned.
ptyx.h:#define VWindow(screen)		(screen->fullVwin.window)
ptyx.h:#define TextWindow(screen)      (screen->fullVwin.window)
ptyx.h:#define Width(screen)		(screen->fullVwin.width)
ptyx.h:#define Height(screen)		(screen->fullVwin.height)
ptyx.h:#define FullWidth(screen)	(screen->fullVwin.fullwidth)
ptyx.h:#define FullHeight(screen)	(screen->fullVwin.fullheight)
ptyx.h:#define FontWidth(screen)	(screen->fullVwin.f_width)
ptyx.h:#define FontHeight(screen)	(screen->fullVwin.f_height)
ptyx.h:#define CursorX(screen,col) ((col) * FontWidth(screen) + screen->border \
ptyx.h:			+ screen->scrollbar)
ptyx.h:#define CursorY(screen,row) ((((row) - screen->topline) * FontHeight(screen)) \
ptyx.h:			+ screen->border)
