Job implementation that renders all layers in parallel. More...

#include <qgsmaprendererparalleljob.h>

Inheritance diagram for QgsMapRendererParallelJob:

Public Member Functions
	QgsMapRendererParallelJob (const QgsMapSettings &settings)
	~QgsMapRendererParallelJob ()
virtual void	cancel () override
	Stop the rendering job - does not return until the job has terminated.
virtual bool	isActive () const override
	Tell whether the rendering job is currently running in background.
virtual QImage	renderedImage () override
	Get a preview/resulting image.
virtual void	start () override
	Start the rendering job and immediately return.
virtual QgsLabelingResults *	takeLabelingResults () override
	Get pointer to internal labeling engine (in order to get access to the results)
virtual void	waitForFinished () override
	Block until the job has finished.
Public Member Functions inherited from QgsMapRendererQImageJob
	QgsMapRendererQImageJob (const QgsMapSettings &settings)
Public Member Functions inherited from QgsMapRendererJob
	QgsMapRendererJob (const QgsMapSettings &settings)
virtual	~QgsMapRendererJob ()
Errors	errors () const
	List of errors that happened during the rendering job - available when the rendering has been finished.
const QgsMapSettings &	mapSettings () const
	Return map settings with which this job was started.
int	renderingTime () const
	Find out how log it took to finish the job (in miliseconds)
void	setCache (QgsMapRendererCache *cache)
	Assign a cache to be used for reading and storing rendered images of individual layers.
void	setRequestedGeometryCacheForLayers (const QStringList &layerIds)
	Set which vector layers should be cached while rendering.

Protected Types
enum	{ Idle, RenderingLayers, RenderingLabels }

Protected Slots
void	renderingFinished ()
	all rendering is finished, including labeling
void	renderLayersFinished ()
	layers are rendered, labeling is still pending

Static Protected Member Functions
static void	renderLabelsStatic (QgsMapRendererParallelJob *self)
static void	renderLayerStatic (LayerRenderJob &job)

Protected Attributes
QImage	mFinalImage
QFuture< void >	mFuture
QFutureWatcher< void >	mFutureWatcher
QgsPalLabeling *	mLabelingEngine
QFuture< void >	mLabelingFuture
QFutureWatcher< void >	mLabelingFutureWatcher
QgsRenderContext	mLabelingRenderContext
LayerRenderJobs	mLayerJobs
enum QgsMapRendererParallelJob:: { ... }	mStatus

Additional Inherited Members
Public Types inherited from QgsMapRendererJob
typedef QList< Error >	Errors
Signals inherited from QgsMapRendererJob
void	finished ()
	emitted when asynchronous rendering is finished (or canceled).
Protected Member Functions inherited from QgsMapRendererJob
void	cleanupJobs (LayerRenderJobs &jobs)
bool	needTemporaryImage (QgsMapLayer *ml)
LayerRenderJobs	prepareJobs (QPainter painter, QgsPalLabeling labelingEngine)
void	updateLayerGeometryCaches ()
	called when rendering has finished to update all layers' geometry caches

Detailed Description

Job implementation that renders all layers in parallel.

The resulting map image can be retrieved with renderedImage() function. It is safe to call that function while rendering is active to see preview of the map.