From:	"Tim B" <batman AT bat DOT cave>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Frustrating mouse problem
Lines:	21
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Date:	Sun, 31 Oct 1999 01:51:26 -0500
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

In the svga graphics mode program I'm currently writing with grx23 a strange
problem occurs when I move the mouse cursor near a line (particularly a
vertical line).  Pixels with the same color as the line start to appear
suddenly and seemingly randomly nearby but they only seem to appear when the
mouse is moving.   Nor do they seem to appear at resolutions lower than
640x480.  I thought maybe I had coded something incorrectly so I ran the
example mouse program in the test directory and it was happening in that
program too.

I recently upgraded to a faster cpu (cyrix 333) so I thought maybe it was a
quirk with grx23 (I had never noticed this problem with my 486 cpu) so I
installed allegro and ran the ex13 program and it was happening there too.
I should mention that this problem doesn't happen with the win98 mouse
cursor.

I really need the mouse to work correctly without creating these extra
pixels.  If anybody can help with a fix or work around or even pointing me
in the right direction to figuring this out I'd be extremely grateful.

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