forked from rrcarlosr/Jetpack
40 lines
2.0 KiB
Plaintext
40 lines
2.0 KiB
Plaintext
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'
|