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dix: fix warning in pointer acceleration

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newer gcc's warn against how this cast is done (though it eludes me why),
and lrintf() is also faster especially on insane processors like the P4
(http://www.mega-nerd.com/FPcast).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Simon Thum 2009-04-30 12:58:48 +02:00 committed by Peter Hutterer
parent 1b1b20d6e3
commit 35fce4e5c7
1 changed files with 8 additions and 2 deletions
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10
dix/ptrveloc.c
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@ -994,14 +994,20 @@ acceleratePointerPredictable(
if (dx) {
tmp = mult * fdx + pDev->last.remainder[0];
*px = (int)roundf(tmp);
/* Since it may not be apparent: lrintf() does not offer
* strong statements about rounding; however because we
* process each axis conditionally, there's no danger
* of a toggling remainder. Its lack of guarantees hopefully
* makes it faster on the average target. */
*px = lrintf(tmp);
pDev->last.remainder[0] = tmp - (float)*px;
}
if (dy) {
tmp = mult * fdy + pDev->last.remainder[1];
*py = (int)roundf(tmp);
*py = lrintf(tmp);
pDev->last.remainder[1] = tmp - (float)*py;
}
DebugAccelF("pos (%i | %i) remainders x: %.3f y: %.3f delta x:%.3f y:%.3f\n", *px, *py, pDev->last.remainder[0], pDev->last.remainder[1], fdx, fdy);
}
}
}