Debugged a bit further: seems that what's happening is that the
call to gdk_event_get_axis around line 308 of dyna-draw-context.cpp
static void
sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
{
if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
else
dc->pressure = DDC_DEFAULT_PRESSURE;
isn't finding the GDK_AXIS_PRESSURE axis any more,
after Inkscape switches to the "Inkscape default" palette.
The gdk_event_get_axis documentation doesn't give much hints on
why an axis would suddenly no longer be found, so I guess something
got clobbered somewhere when Inkscape switched palettes.
http://developer.gnome.org/gdk/stable/gdk-Events.html#gdk-event-get-axis
But anyways, with a bit more time I might be able to track down which bit
of code is doing the clobbering, it's probably somewhere in
ui/dialog/swatches.cpp
when it loads these special (larger?) kinds of palettes, but anyways at least
we can
provide the developers a more useful bug report, by explaining that if they put
a
breakpoint on the line 311 of dyna-draw-context.cpp,
dc->pressure = DDC_DEFAULT_PRESSURE;
on a system where we know pen pressure is working properly, then that
breakpoint should NEVER trigger. But it does!
The Inkscape code seems a little bit too trusting of the gdk_event_get_axis
result:
it hardly makes much sense for the GDK_AXIS_PRESSURE axis to be found OK
earlier,
then have it suddenly "vanish". I guess there should be some kind of popup
message
telling the user something like "Your device has mysteriously stopped providing
any
pen pressure information. Please check the gdk_event_get_axis call is working
properly."
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https://bugs.launchpad.net/bugs/790130
Title:
no pressure sensitivity with wacom tablet in inkscape
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