[PATCH] dix: work around scaling issues during WarpPointer (#53037)

Keith Packard keithp at keithp.com
Tue Aug 14 17:19:45 PDT 2012

Peter Hutterer <peter.hutterer at who-t.net> writes:

> In WarpPointer calls, we get input in screen coordinates. They must be
> scaled to device coordinates, and then back to screen coordinates for screen
> crossing and root coordinates in events.
> The rounding errors introduced (and clipping in core/XI 1.x events) can lead
> to the actual position being different to the requested input coordinates.
> e.g. 200 scales to 199.9999, truncated to 199 in the event.

Would it be useful to do a bit of rounding in these conversions

keith.packard at intel.com
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