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- 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'
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