NAME

await_retrace − waits for vertical retrace on raster scanning devices. 

SYNOPSIS

C SYNTAX

void await_retrace(fildes);
int fildes;

FORTRAN77 SYNTAX

        subroutine await_retrace(fildes)
        integer*4 fildes

PASCAL SYNTAX

procedure await_retrace(fildes:integer);

HP-UX COMPATIBILITY

Level: HP-UX/STANDARD

Origin: HP

DESCRIPTION

INPUT PARAMETER

fildes
is an integer file descriptor returned by gopen when an I/O path to a graphics device is opened. 

DISCUSSION

The await retrace allows for small updates to be performed during vertical retrace, such that flicker and/or picture distortion is reduced. 
 
This procedure is useful for double buffering. Display_enable changes should be preceded by this procedure. 

SEE ALSO

display_enable(3g). 

Hewlett-Packard  —  last mod. May 11, 2021