NAME

blankscreen - turns off screen refresh

SPECIFICATION

C
blankscreen(bool)
Boolean bool;

FORTRAN
subroutine blanks(bool)
logical bool

Pascal
procedure blankscreen(bool: Boolean);

DESCRIPTION

blankscreen turns on and off screen refresh.  bool = TRUE stops display and bool = FALSE restarts display.  When bitplanes are being simultaneously viewed and updated (as in single-buffer mode, RGB mode, and when the front buffer is being displayed in double buffer mode) there is memory contention, and hence reduced performance.  This is especially true for non-interlaced monitors.  To speed up drawing in these cases, turn the display off while drawing. 

NOTE

This command can be used only in immediate mode. 

Version 2.4  —  May 08, 1986