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QmlProfiler: Make sure UI is properly rendered

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Do the QML based painting when requested inside the UI thread, and
only copy the final canvas pixmap in the renderer thread (in paint()).
To avoid excessive re-drawing delay the painting via a timer to the
next event loop run.

The previous logic was still from Qt Quick 1 times, where the paint()
method was called in the GUI thread. This has changed in Qt Quick 2:
Here the paint() method will be called (on Unix) in a separate renderer
thread, making the drawRegion / onDrawRegion connections implicitly
deferred.

Change-Id: I298547013658e4cd1e94115305577bdb96cd0b2a
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
This commit is contained in:
Kai Koehne
2013-10-30 13:46:03 +01:00
parent 0d65cf11d0
commit 33ac7e4445
3 changed files with 31 additions and 32 deletions
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39
src/plugins/qmlprofiler/canvas/qmlprofilercanvas.cpp
View File

@@ -39,36 +39,45 @@ namespace Internal {
QmlProfilerCanvas::QmlProfilerCanvas()
: m_context2d(new Context2D(this))
, m_dirty(true)
{
setAcceptedMouseButtons(Qt::LeftButton);
m_drawTimer.setSingleShot(true);
connect(&m_drawTimer, SIGNAL(timeout()), this, SLOT(draw()));
m_drawTimer.start();
}
void QmlProfilerCanvas::requestPaint()
{
update();
if (m_context2d->size().width() != width()
|| m_context2d->size().height() != height()) {
m_drawTimer.start();
} else {
update();
}
}
void QmlProfilerCanvas::requestRedraw()
{
setDirty(true);
m_drawTimer.start();
}
// called from GUI thread. Draws into m_context2d.
void QmlProfilerCanvas::draw()
{
QMutexLocker lock(&m_pixmapMutex);
m_context2d->reset();
m_context2d->setSize(width(), height());
if (width() != 0 && height() != 0)
emit drawRegion(m_context2d, QRect(0, 0, width(), height()));
update();
}
// called from OpenGL thread. Renders m_context2d into OpenGL buffer.
void QmlProfilerCanvas::paint(QPainter *p)
{
if (m_context2d->size().width() != width() || m_context2d->size().height() != height()) {
m_dirty = true;
m_context2d->setSize(width(), height());
}
if (m_dirty) {
m_context2d->reset();
emit drawRegion(m_context2d, QRect(0, 0, width(), height()));
setDirty(false);
}
QMutexLocker lock(&m_pixmapMutex);
p->drawPixmap(0, 0, m_context2d->pixmap());
}