swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: 326ba5010a5429a5a528b268b36a5900d4ab0eba authored by Linus Torvalds on 28 August 2009, 00:59:04 UTC
Linux 2.6.31-rc8
Linux 2.6.31-rc8
Tip revision: 326ba50
VGA-softcursor.txt
Software cursor for VGA by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>
======================= and Martin Mares <mj@atrey.karlin.mff.cuni.cz>
Linux now has some ability to manipulate cursor appearance. Normally, you
can set the size of hardware cursor (and also work around some ugly bugs in
those miserable Trident cards--see #define TRIDENT_GLITCH in drivers/video/
vgacon.c). You can now play a few new tricks: you can make your cursor look
like a non-blinking red block, make it inverse background of the character it's
over or to highlight that character and still choose whether the original
hardware cursor should remain visible or not. There may be other things I have
never thought of.
The cursor appearance is controlled by a "<ESC>[?1;2;3c" escape sequence
where 1, 2 and 3 are parameters described below. If you omit any of them,
they will default to zeroes.
Parameter 1 specifies cursor size (0=default, 1=invisible, 2=underline, ...,
8=full block) + 16 if you want the software cursor to be applied + 32 if you
want to always change the background color + 64 if you dislike having the
background the same as the foreground. Highlights are ignored for the last two
flags.
The second parameter selects character attribute bits you want to change
(by simply XORing them with the value of this parameter). On standard VGA,
the high four bits specify background and the low four the foreground. In both
groups, low three bits set color (as in normal color codes used by the console)
and the most significant one turns on highlight (or sometimes blinking--it
depends on the configuration of your VGA).
The third parameter consists of character attribute bits you want to set.
Bit setting takes place before bit toggling, so you can simply clear a bit by
including it in both the set mask and the toggle mask.
Examples:
=========
To get normal blinking underline, use: echo -e '\033[?2c'
To get blinking block, use: echo -e '\033[?6c'
To get red non-blinking block, use: echo -e '\033[?17;0;64c'