I had a look at the Krita sources, as pointed out by Jussi, and the
problem does not come from the kis_canvas_controller code, but seems to
come from kis_canvas_widget_base.cpp.
There, we have the following code:
void KisCanvasWidgetBase::processTabletEvent(QTabletEvent *e)
{
widget()->setFocus(Qt::OtherFocusReason);
m_d->blockMouseEvent.start(100);
const QPointF pos = e->hiResGlobalPos() - widget()->mapToGlobal(QPoint(0,
0));
m_d->toolProxy->tabletEvent(e,
m_d->coordinatesConverter->widgetToDocument(pos));
// HACK
e->ignore();
m_d->ignorenextMouseEventExceptRightMiddleClick = true;
// HACK
}
My debugging shows that the problem is in the Qt hiResGlobalPos method
from QTabletEvent.
event->pos() seems to give correct results for the QTabletEvent, but
event->hiResGlobalPos() sometimes gives strange results that cause the random
lines.
For exemple, I have the following values from hiResGlobalPos (the x
coordinate):
(...)
453.731
453.682
453.779
12.4536 <--- weird value
453.633
453.487
(...)
So my guess is that Qt has problem getting the correct values for this
hiResGlobalPos, if anybody with a better inside knowledge of Qt can have
a look...
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https://bugs.launchpad.net/bugs/799202
Title:
wacom stylus jumps with latest xserver-xorg-core
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