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High resolution devices was generating integer overflow. For instance the wacom Cintiq 21UX has an axis value up to 87000. Thus the term (dSx * (Cx - Rxlow)) is greater than MAX_INT32. Using 64bits integer avoids such problem. Signed-off-by: Philippe Ribet <ribet@cena.fr> Signed-off-by: Benjamin Tissoires <tissoire@cena.fr> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>