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Diffstat (limited to 'kernel/Documentation/VGA-softcursor.txt')
| -rw-r--r-- | kernel/Documentation/VGA-softcursor.txt | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/Documentation/VGA-softcursor.txt b/kernel/Documentation/VGA-softcursor.txt new file mode 100644 index 000000000..70acfbf39 --- /dev/null +++ b/kernel/Documentation/VGA-softcursor.txt @@ -0,0 +1,39 @@ +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' |