vga_flip man page on Slackware

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vga_flip(3)		      Svgalib User Manual		   vga_flip(3)

NAME
       vga_flip - toggle between text and graphics mode

SYNOPSIS
       #include <vga.h>

       int vga_flip(void);

DESCRIPTION
       switches	 between  graphics and text mode without destroying the screen
       contents. This makes it possible for your application to use both  text
       and graphics output.

       However,	 This is an old vgalib function. You should really only use it
       for debugging as it runs extremely unstable because  svgalib  now  does
       its  own	 virtual  console management. If you want to perform a similar
       action, save the current screen	contents  with	ordinary  memory  copy
       operation  to  the frame buffer or gl_getbox(3), set vga_setmode(TEXT),
       then call vga_setmode(3) to return to graphics  operation  and  restore
       the screen contents with memory or gl_putbox(3).

       One  could  also	 use  vga_drawscansegment(3) and vga_getscansegment(3)
       calls.

       However, avoid any calls to vga_flip() in your applications.

       The function always returns 0, a fact on which you shouldn't rely.

       It might be useful if you are debugging one of  your  svgalib  applica‐
       tions  though.	If your program reaches a breakpoint while in graphics
       mode, you can switch to text mode with the gdb command

       print vga_flip()

       and later restore the graphics screen contents with the	same  command.
       It is useful to define the following alias in gdb:

       define flip <Return> print vga_flip() <Return> end <Return>

SEE ALSO
       svgalib(7),    vgagl(7),	   libvga.config(5),   vga_init(3),   vga_set‐
       flipchar(3),	   vga_drawscanline(3),	       vga_drawscansegment(3),
       vga_getscansegment(3), gl_getbox(3), gl_putbox(3)

AUTHOR
       This  manual  page  was	edited by Michael Weller <eowmob@exp-math.uni-
       essen.de>. The exact source of the referenced function as  well	as  of
       the original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm
       Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally this might be wrong. I hereby asked to be excused  by  the
       original author and will happily accept any additions or corrections to
       this first version of the svgalib manual.

Svgalib (>= 1.2.11)		 27 July 1997			   vga_flip(3)
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