void QgsMapRendererParallelJob::cancel()
{
if ( !isActive() )
return;
QgsDebugMsg( QString( "PARALLEL cancel at status %1" ).arg( mStatus ) );
mLabelingRenderContext.setRenderingStopped( true );
for ( LayerRenderJobs::iterator it = mLayerJobs.begin(); it != mLayerJobs.end(); ++it )
{
it->context.setRenderingStopped( true );
}
if ( mStatus == RenderingLayers )
{
disconnect( &mFutureWatcher, SIGNAL( finished() ), this, SLOT( renderLayersFinished() ) );
mFutureWatcher.waitForFinished();
renderLayersFinished();
}
if ( mStatus == RenderingLabels )
{
disconnect( &mLabelingFutureWatcher, SIGNAL( finished() ), this, SLOT( renderingFinished() ) );
mLabelingFutureWatcher.waitForFinished();
renderingFinished();
}
Q_ASSERT( mStatus == Idle );
}
void QgsMapRendererParallelJob::waitForFinished()
{
if ( !isActive() )
return;
if ( mStatus == RenderingLayers )
{
disconnect( &mFutureWatcher, SIGNAL( finished() ), this, SLOT( renderLayersFinished() ) );
QTime t;
t.start();
mFutureWatcher.waitForFinished();
QgsDebugMsg( QString( "waitForFinished (1): %1 ms" ).arg( t.elapsed() / 1000.0 ) );
renderLayersFinished();
}
if ( mStatus == RenderingLabels )
{
disconnect( &mLabelingFutureWatcher, SIGNAL( finished() ), this, SLOT( renderingFinished() ) );
QTime t;
t.start();
mLabelingFutureWatcher.waitForFinished();
QgsDebugMsg( QString( "waitForFinished (2): %1 ms" ).arg( t.elapsed() / 1000.0 ) );
renderingFinished();
}
Q_ASSERT( mStatus == Idle );
}
void QgsMapRendererParallelJob::start()
{
if ( isActive() )
return;
mRenderingStart.start();
mStatus = RenderingLayers;
delete mLabelingEngine;
mLabelingEngine = nullptr;
delete mLabelingEngineV2;
mLabelingEngineV2 = nullptr;
if ( mSettings.testFlag( QgsMapSettings::DrawLabeling ) )
{
#ifdef LABELING_V2
mLabelingEngineV2 = new QgsLabelingEngineV2();
mLabelingEngineV2->readSettingsFromProject();
mLabelingEngineV2->setMapSettings( mSettings );
#else
mLabelingEngine = new QgsPalLabeling;
mLabelingEngine->loadEngineSettings();
mLabelingEngine->init( mSettings );
#endif
}
mLayerJobs = prepareJobs( nullptr, mLabelingEngine, mLabelingEngineV2 );
// prepareJobs calls mapLayer->createMapRenderer may involve cloning a RasterDataProvider,
// whose constructor may need to download some data (i.e. WMS, AMS) and doing so runs a
// QEventLoop waiting for the network request to complete. If unluckily someone calls
// mapCanvas->refresh() while this is happening, QgsMapRendererCustomPainterJob::cancel is
// called, deleting the QgsMapRendererCustomPainterJob while this function is running.
// Hence we need to check whether the job is still active before proceeding
if ( !isActive() )
return;
QgsDebugMsg( QString( "QThreadPool max thread count is %1" ).arg( QThreadPool::globalInstance()->maxThreadCount() ) );
// start async job
connect( &mFutureWatcher, SIGNAL( finished() ), SLOT( renderLayersFinished() ) );
mFuture = QtConcurrent::map( mLayerJobs, renderLayerStatic );
mFutureWatcher.setFuture( mFuture );
}
void QgsMapRendererParallelJob::start()
{
if ( isActive() )
return;
mRenderingStart.start();
mStatus = RenderingLayers;
delete mLabelingEngine;
mLabelingEngine = nullptr;
delete mLabelingEngineV2;
mLabelingEngineV2 = nullptr;
if ( mSettings.testFlag( QgsMapSettings::DrawLabeling ) )
{
#ifdef LABELING_V2
mLabelingEngineV2 = new QgsLabelingEngineV2();
mLabelingEngineV2->readSettingsFromProject();
mLabelingEngineV2->setMapSettings( mSettings );
#else
mLabelingEngine = new QgsPalLabeling;
mLabelingEngine->loadEngineSettings();
mLabelingEngine->init( mSettings );
#endif
}
mLayerJobs = prepareJobs( nullptr, mLabelingEngine, mLabelingEngineV2 );
QgsDebugMsg( QString( "QThreadPool max thread count is %1" ).arg( QThreadPool::globalInstance()->maxThreadCount() ) );
// start async job
connect( &mFutureWatcher, SIGNAL( finished() ), SLOT( renderLayersFinished() ) );
mFuture = QtConcurrent::map( mLayerJobs, renderLayerStatic );
mFutureWatcher.setFuture( mFuture );
}
