I looked into Qt and there are three locations where x and y tilt values
are obtained. They are all in qapplication_x11.cpp in the function
QETWidget::translateXinputEvent.
The first one is this (I have removed quite a lot of lines, check the
original to be sure):
s = XQueryDeviceState(X11->display, static_cast<XDevice *>(tablet->device));
for (j = 0; j < s->num_classes; j++) {
[stuff]
if (!proximity) {
xTilt = short(vs->valuators[WAC_XTILT_I]);
yTilt = short(vs->valuators[WAC_YTILT_I]);
pressure = vs->valuators[WAC_PRESSURE_I];
So it loops over something(?) and grabs things. Then a bit later it does
this:
if (motion) {
xTilt = (short) motion->axis_data[3];
yTilt = (short) motion->axis_data[4];
where motion is an XDeviceMotionEvent.
Immediately afte that it does
} else if (button) {
xTilt = (short) button->axis_data[3];
yTilt = (short) button->axis_data[4];
where button is an XDeviceButtonEvent.
Based on this the potential bugs are that either Qt does masked
valuators wrong or the X server gives incorrect data in event
structures. The xinput output mentioned above would seem to indicate
that the fault lies with Qt.
Chase, what do you think?
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https://bugs.launchpad.net/bugs/799202
Title:
wacom stylus jumps with latest xserver-xorg-core
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