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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  op-
       eration	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-es-
       sen.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)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR

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