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Added motion event compression in xcb plugin.

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We did this in 4.8 too, to avoid swamping the event queue with stale
motion events. If you're interested in fine grained motion events you
just need to have a responsive main loop. Most applications are only
interested in the latest mouse position in any case.

Fixes performance issues in QML where an onMouseXChanged or
onMouseYChanged in a mouse area does directly or indirectly runs some
heavy computations, slowing rendering to a halt since the main loop is
constantly busy.

Change-Id: I169c96458db4d57b689d6c2c915765b11c35e123
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
This commit is contained in:
Samuel Rødal 2012-11-09 18:16:04 +01:00 committed by The Qt Project
parent e5eeffbf8b
commit d729ca5ece
1 changed files with 8 additions and 0 deletions
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8
src/plugins/platforms/xcb/qxcbconnection.cpp
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@ -961,6 +961,14 @@ void QXcbConnection::processXcbEvents()
if (!response_type) {
handleXcbError((xcb_generic_error_t *)event);
} else {
if (response_type == XCB_MOTION_NOTIFY) {
// compress multiple motion notify events in a row
// to avoid swamping the event queue
xcb_generic_event_t *next = eventqueue->value(i+1, 0);
if (next && (next->response_type & ~0x80) == XCB_MOTION_NOTIFY)
continue;
}
QVector<PeekFunc>::iterator it = m_peekFuncs.begin();
while (it != m_peekFuncs.end()) {
// These callbacks return true if the event is what they were