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dix: fix pointer accelerations remainder handling

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This didn't really work as intended, but did amazingly well thanks
to roundf() hiding the defect. Cheers!

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Simon Thum 2009-04-08 14:35:01 +02:00 committed by Peter Hutterer
parent 98f4179156
commit 06aebecb19
1 changed files with 7 additions and 7 deletions
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14
dix/ptrveloc.c
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@ -950,7 +950,7 @@ acceleratePointerPredictable(
int *px = NULL, *py = NULL;
DeviceVelocityPtr velocitydata =
(DeviceVelocityPtr) pDev->valuator->accelScheme.accelData;
float fdx, fdy; /* no need to init */
float fdx, fdy, tmp; /* no need to init */
Bool soften = TRUE;
if (!num_valuators || !valuators || !velocitydata)
@ -991,14 +991,14 @@ acceleratePointerPredictable(
(mult > 1.0) && soften);
if (dx) {
pDev->last.remainder[0] = roundf(mult * fdx + pDev->last.remainder[0]);
*px = (int)pDev->last.remainder[0];
pDev->last.remainder[0] = pDev->last.remainder[0] - (float)*px;
tmp = mult * fdx + pDev->last.remainder[0];
*px = (int)roundf(tmp);
pDev->last.remainder[0] = tmp - (float)*px;
}
if (dy) {
pDev->last.remainder[1] = roundf(mult * fdy + pDev->last.remainder[1]);
*py = (int)pDev->last.remainder[1];
pDev->last.remainder[1] = pDev->last.remainder[1] - (float)*py;
tmp = mult * fdy + pDev->last.remainder[1];
*py = (int)roundf(tmp);
pDev->last.remainder[1] = tmp - (float)*py;
}
}
}