Don't access the xi2mask bytes directly or calculate the offsets manually,
use a few helper functions instead. XI2 masks are a bit weird in the event
handling code since they slot onto the legacy code. For core/XI 1.x events,
the event mask is a CARD32. That mask is used together with the event filter
(also 32 bit) to determine if event delivery should be attempted.
XI2 masks are of arbitrary size and their mask is simply the byte of the
mask that contains the event mask. Likewise, the filter is a single byte
matching that mask. Provide helper functions get these bytes and masks in
the right order instead of accessing them manually.
EventIsDeliverable should be part of this cleanup patch but it will be
gutted with the next patch.
Co-Authored-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>
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