svn commit: r316642 - head/sys/dev/syscons

[Andrey Chernov]

On 08.04.2017 13:00, Bruce Evans wrote:
> Log:
>   Quick fix for removal of the mouse cursor in vga direct graphics modes
>   (that is, in all supported 8, 15, 16 and 24-color modes).  Moving the
>   mouse cursor while holding down a button (giving cut marking) left a
>   trail of garbage from misremoved mouse cursors (usually colored
>   rectangles and not cursor shapes).  Cases with a button not held down
>   worked better and may even have worked.
>   
>   No renderer support for removing (software) mouse cursors is needed
>   (and many renderers don't have any), since sc_remove_mouse_image()
>   marks for update the region containing the image and usually much
>   more.  The mouse cursor can be (partially) over as many as 4 character
>   cells, and removing it in only the 1-4 cells occupied by it would be
>   best for efficiency and for avoiding flicker.  

Please don't forget that this 5 cells range (0xd0-0xd4, last one becomes
SC_CURSOR_CHAR) can be redefined with "vidcontrol -M", it is needed for
the case they overlap valid characters region for some code tables.