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qgsmaprenderersequentialjob.cpp
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qgsmaprenderersequentialjob.cpp
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/***************************************************************************
qgsmaprenderersequentialjob.cpp
--------------------------------------
Date : December 2013
Copyright : (C) 2013 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsmaprenderersequentialjob.h"
#include "qgslogger.h"
#include "qgsmaprenderercustompainterjob.h"
#include "qgspallabeling.h"
QgsMapRendererSequentialJob::QgsMapRendererSequentialJob( const QgsMapSettings& settings )
: QgsMapRendererQImageJob( settings )
, mInternalJob( nullptr )
, mPainter( nullptr )
, mLabelingResults( nullptr )
{
QgsDebugMsg( "SEQUENTIAL construct" );
mImage = QImage( mSettings.outputSize(), mSettings.outputImageFormat() );
mImage.setDotsPerMeterX( 1000 * settings.outputDpi() / 25.4 );
mImage.setDotsPerMeterY( 1000 * settings.outputDpi() / 25.4 );
mImage.fill( Qt::transparent );
}
QgsMapRendererSequentialJob::~QgsMapRendererSequentialJob()
{
QgsDebugMsg( "SEQUENTIAL destruct" );
if ( isActive() )
{
// still running!
QgsDebugMsg( "SEQUENTIAL destruct -- still running! (canceling)" );
cancel();
}
Q_ASSERT( !mInternalJob && !mPainter );
delete mLabelingResults;
mLabelingResults = nullptr;
}
void QgsMapRendererSequentialJob::start()
{
if ( isActive() )
return; // do nothing if we are already running
mRenderingStart.start();
mErrors.clear();
QgsDebugMsg( "SEQUENTIAL START" );
Q_ASSERT( !mInternalJob && !mPainter );
mPainter = new QPainter( &mImage );
mInternalJob = new QgsMapRendererCustomPainterJob( mSettings, mPainter );
mInternalJob->setCache( mCache );
connect( mInternalJob, SIGNAL( finished() ), SLOT( internalFinished() ) );
mInternalJob->start();
}
void QgsMapRendererSequentialJob::cancel()
{
if ( !isActive() )
return;
QgsDebugMsg( "sequential - cancel internal" );
mInternalJob->cancel();
Q_ASSERT( !mInternalJob && !mPainter );
}
void QgsMapRendererSequentialJob::waitForFinished()
{
if ( !isActive() )
return;
mInternalJob->waitForFinished();
}
bool QgsMapRendererSequentialJob::isActive() const
{
return nullptr != mInternalJob;
}
bool QgsMapRendererSequentialJob::usedCachedLabels() const
{
return mUsedCachedLabels;
}
QgsLabelingResults* QgsMapRendererSequentialJob::takeLabelingResults()
{
QgsLabelingResults* tmp = mLabelingResults;
mLabelingResults = nullptr;
return tmp;
}
QImage QgsMapRendererSequentialJob::renderedImage()
{
if ( isActive() && mCache )
// this will allow immediate display of cached layers and at the same time updates of the layer being rendered
return composeImage( mSettings, mInternalJob->jobs(), LabelRenderJob() );
else
return mImage;
}
void QgsMapRendererSequentialJob::internalFinished()
{
QgsDebugMsg( "SEQUENTIAL finished" );
mPainter->end();
delete mPainter;
mPainter = nullptr;
mLabelingResults = mInternalJob->takeLabelingResults();
mUsedCachedLabels = mInternalJob->usedCachedLabels();
mErrors = mInternalJob->errors();
// now we are in a slot called from mInternalJob - do not delete it immediately
// so the class is still valid when the execution returns to the class
mInternalJob->deleteLater();
mInternalJob = nullptr;
mRenderingTime = mRenderingStart.elapsed();
emit finished();
}