vga_flip - toggle between text and graphics mode
switches between graphics and text mode without destroying the screen contents.
This makes it possible for your application to use both text and graphics
, 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
(3) to return to graphics operation and restore the screen
contents with memory or gl_putbox
One could also use vga_drawscansegment
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 applications though.
If your program reaches a breakpoint while in graphics mode, you can switch to
text mode with the gdb command
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
This manual page was edited by Michael Weller
<email@example.com>. 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
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.