You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
2.0 KiB
39 lines
2.0 KiB
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'
|
|
|