dix: Add unaccelerated valuators to the ValuatorMask

Allows a mask to carry both accelerated and unaccelerated motion at the same
time.

This is required for xf86-input-libinput where the pointer acceleration
happens in libinput already, but parts of the server, specifically raw events
and DGA rely on device-specific unaccelerated data.

To ease integration add this as a second set to the ValuatorMask rather than
extending all APIs to carry a second, possibly NULL set of valuators.

Note that a valuator mask should only be used in either accel/unaccel or
standard mode at any time. Switching requires either a valuator_mask_zero()
call or unsetting all valuators one-by-one. Trying to mix the two will produce
a warning.

The server has a shortcut for changing a mask with the
valuator_mask_drop_unaccelerated() call. This saves us from having to loop
through all valuators on every event, we can just drop the bits we know we
don't want.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

(cherry-picked from commit 4c2f2cb4c8ca1ab894a65828fdd39aea9b014f69)

1 files changed, 2 insertions, 0 deletions

diff --git a/include/inpututils.h b/include/inpututils.h
index 53c96ba1c..4e9081563 100644
--- a/include/inpututils.h
+++ b/include/inpututils.h
@@ -36,8 +36,10 @@ extern Mask event_filters[MAXDEVICES][MAXEVENTS];
 
 struct _ValuatorMask {
     int8_t last_bit;            /* highest bit set in mask */
+    int8_t has_unaccelerated;
     uint8_t mask[(MAX_VALUATORS + 7) / 8];
     double valuators[MAX_VALUATORS];    /* valuator data */
+    double unaccelerated[MAX_VALUATORS];    /* valuator data */
 };
 
 extern void verify_internal_event(const InternalEvent *ev);