From 60cd1c67759642018ef93cc45a90714729100d9d Mon Sep 17 00:00:00 2001
From: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Date: Thu, 28 Apr 2016 11:30:30 +0200
Subject: [PATCH] xcb: don't compress tablet motion events
7edd10e6c added this compression feature, but it's not a good idea for
drawing-tablet applications, because smooth drawing depends on receiving
every movement of the stylus.
Also show the device ID in qt.qpa.input.devices category logging.
[ChangeLog][X11] The new X event compression feature that was added in
5.6.0 no longer applies to motion events from drawing tablets.
Task-number: QTBUG-44964
Change-Id: Icd2ca8ca77d8f80c2f39160c74208db10e382501
Reviewed-by: Gatis Paeglis <gatis.paeglis@theqtcompany.com>
---
src/plugins/platforms/xcb/qxcbconnection.cpp | 7 ++++++-
src/plugins/platforms/xcb/qxcbconnection.h | 1 +
.../platforms/xcb/qxcbconnection_xi2.cpp | 21 ++++++++++++-------
3 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index edfaf2b0156..669ef3a98e3 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -1626,8 +1626,13 @@ bool QXcbConnection::compressEvent(xcb_generic_event_t *event, int currentIndex,
if (!m_xi2Enabled)
return false;
- // compress XI_Motion
+ // compress XI_Motion, but not from tablet devices
if (isXIType(event, m_xiOpCode, XI_Motion)) {
+#ifndef QT_NO_TABLETEVENT
+ xXIDeviceEvent *xdev = reinterpret_cast<xXIDeviceEvent *>(event);
+ if (const_cast<QXcbConnection *>(this)->tabletDataForDevice(xdev->sourceid))
+ return false;
+#endif // QT_NO_TABLETEVENT
for (int j = nextIndex; j < eventqueue->size(); ++j) {
xcb_generic_event_t *next = eventqueue->at(j);
if (!isValid(next))
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index 7ba95887ffe..501da1ce7b9 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -578,6 +578,7 @@ private:
bool xi2HandleTabletEvent(void *event, TabletData *tabletData, QXcbWindowEventListener *eventListener);
void xi2ReportTabletEvent(TabletData &tabletData, void *event);
QVector<TabletData> m_tabletData;
+ TabletData *tabletDataForDevice(int id);
#endif // !QT_NO_TABLETEVENT
struct ScrollingDevice {
ScrollingDevice() : deviceId(0), verticalIndex(0), horizontalIndex(0), orientations(0), legacyOrientations(0) { }
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index 9911afb11e3..025dde3dbbc 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -113,7 +113,7 @@ void QXcbConnection::xi2SetupDevices()
// Only non-master pointing devices are relevant here.
if (devices[i].use != XISlavePointer)
continue;
- qCDebug(lcQpaXInputDevices) << "input device "<< devices[i].name;
+ qCDebug(lcQpaXInputDevices) << "input device " << devices[i].name << "ID" << devices[i].deviceid;
#ifndef QT_NO_TABLETEVENT
TabletData tabletData;
#endif
@@ -530,12 +530,9 @@ void QXcbConnection::xi2HandleEvent(xcb_ge_event_t *event)
#ifndef QT_NO_TABLETEVENT
if (!xiEnterEvent) {
- for (int i = 0; i < m_tabletData.count(); ++i) {
- if (m_tabletData.at(i).deviceId == sourceDeviceId) {
- if (xi2HandleTabletEvent(xiEvent, &m_tabletData[i], eventListener))
- return;
- }
- }
+ QXcbConnection::TabletData *tablet = tabletDataForDevice(sourceDeviceId);
+ if (tablet && xi2HandleTabletEvent(xiEvent, tablet, eventListener))
+ return;
}
#endif // QT_NO_TABLETEVENT
@@ -1198,6 +1195,16 @@ void QXcbConnection::xi2ReportTabletEvent(TabletData &tabletData, void *event)
xTilt, yTilt, tangentialPressure,
rotation, 0, tabletData.serialId);
}
+
+QXcbConnection::TabletData *QXcbConnection::tabletDataForDevice(int id)
+{
+ for (int i = 0; i < m_tabletData.count(); ++i) {
+ if (m_tabletData.at(i).deviceId == id)
+ return &m_tabletData[i];
+ }
+ return Q_NULLPTR;
+}
+
#endif // QT_NO_TABLETEVENT
#endif // XCB_USE_XINPUT2
--
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