| 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' |