QGIS API Documentation  3.23.0-Master (dd0cd13a00)
Public Slots | Public Member Functions | List of all members
QgsMapRendererSequentialJob Class Reference

Job implementation that renders everything sequentially in one thread. More...

#include <qgsmaprenderersequentialjob.h>

Inheritance diagram for QgsMapRendererSequentialJob:
Inheritance graph
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Public Slots

void internalFinished ()
 

Public Member Functions

 QgsMapRendererSequentialJob (const QgsMapSettings &settings)
 
 ~QgsMapRendererSequentialJob () override
 
void cancel () override
 Stop the rendering job - does not return until the job has terminated. More...
 
void cancelWithoutBlocking () override
 Triggers cancellation of the rendering job without blocking. More...
 
bool isActive () const override
 Tell whether the rendering job is currently running in background. More...
 
QImage renderedImage () override
 Gets a preview/resulting image. More...
 
QgsLabelingResultstakeLabelingResults () override
 Gets pointer to internal labeling engine (in order to get access to the results). More...
 
bool usedCachedLabels () const override
 Returns true if the render job was able to use a cached labeling solution. More...
 
void waitForFinished () override
 Block until the job has finished. More...
 
- Public Member Functions inherited from QgsMapRendererQImageJob
 QgsMapRendererQImageJob (const QgsMapSettings &settings)
 
- Public Member Functions inherited from QgsMapRendererJob
 QgsMapRendererJob (const QgsMapSettings &settings)
 
 ~QgsMapRendererJob () override
 
Errors errors () const
 List of errors that happened during the rendering job - available when the rendering has been finished. More...
 
const QgsFeatureFilterProviderfeatureFilterProvider () const
 Returns the feature filter provider used by the QgsRenderContext of each LayerRenderJob. More...
 
QStringList layersRedrawnFromCache () const
 Returns a list of the layer IDs for all layers which were redrawn from cached images. More...
 
const QgsMapSettingsmapSettings () const
 Returns map settings with which this job was started. More...
 
QHash< QgsMapLayer *, int > perLayerRenderingTime () const
 Returns the render time (in ms) per layer. More...
 
int renderingTime () const
 Returns the total time it took to finish the job (in milliseconds). More...
 
void setCache (QgsMapRendererCache *cache)
 Assign a cache to be used for reading and storing rendered images of individual layers. More...
 
void setFeatureFilterProvider (const QgsFeatureFilterProvider *f)
 Set the feature filter provider used by the QgsRenderContext of each LayerRenderJob. More...
 
void setLayerRenderingTimeHints (const QHash< QString, int > &hints)
 Sets approximate render times (in ms) for map layers. More...
 
void start ()
 Start the rendering job and immediately return. More...
 
QgsRenderedItemResultstakeRenderedItemResults ()
 Takes the rendered item results from the map render job and returns them. More...
 

Additional Inherited Members

- Public Types inherited from QgsMapRendererJob
typedef QList< QgsMapRendererJob::ErrorErrors
 
- Signals inherited from QgsMapRendererJob
void finished ()
 emitted when asynchronous rendering is finished (or canceled). More...
 
void renderingLayersFinished ()
 Emitted when the layers are rendered. More...
 
- Static Public Attributes inherited from QgsMapRendererJob
static const QString LABEL_CACHE_ID
 QgsMapRendererCache ID string for cached label image. More...
 
static const QString LABEL_PREVIEW_CACHE_ID
 QgsMapRendererCache ID string for cached label image during preview compositions only. More...
 
static const QgsSettingsEntryBool settingsLogCanvasRefreshEvent = QgsSettingsEntryBool( QStringLiteral( "Map/logCanvasRefreshEvent" ), QgsSettings::NoSection, false )
 Settings entry log canvas refresh event. More...
 
- Protected Member Functions inherited from QgsMapRendererJob
void cleanupJobs (std::vector< LayerRenderJob > &jobs)
 
void cleanupLabelJob (LabelRenderJob &job)
 Handles clean up tasks for a label job, including deletion of images and storing cached label results. More...
 
void cleanupSecondPassJobs (std::vector< LayerRenderJob > &jobs)
 
void logRenderingTime (const std::vector< LayerRenderJob > &jobs, const std::vector< LayerRenderJob > &secondPassJobs, const LabelRenderJob &labelJob)
 
std::vector< LayerRenderJob > prepareJobs (QPainter *painter, QgsLabelingEngine *labelingEngine2, bool deferredPainterSet=false)
 Creates a list of layer rendering jobs and prepares them for later render. More...
 
bool prepareLabelCache () const
 Prepares the cache for storing the result of labeling. More...
 
LabelRenderJob prepareLabelingJob (QPainter *painter, QgsLabelingEngine *labelingEngine2, bool canUseLabelCache=true)
 Prepares a labeling job. More...
 
std::vector< LayerRenderJob > prepareSecondPassJobs (std::vector< LayerRenderJob > &firstPassJobs, LabelRenderJob &labelJob)
 Prepares jobs for a second pass, if selective masks exist (from labels or symbol layers). More...
 
- Static Protected Member Functions inherited from QgsMapRendererJob
static QImage composeImage (const QgsMapSettings &settings, const std::vector< LayerRenderJob > &jobs, const LabelRenderJob &labelJob, const QgsMapRendererCache *cache=nullptr)
 
static void composeSecondPass (std::vector< LayerRenderJob > &secondPassJobs, LabelRenderJob &labelJob)
 Compose second pass images into first pass images. More...
 
static Q_DECL_DEPRECATED void drawLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext, QgsLabelingEngine *labelingEngine2, QPainter *painter)
 
static void drawLabeling (QgsRenderContext &renderContext, QgsLabelingEngine *labelingEngine2, QPainter *painter)
 
static QImage layerImageToBeComposed (const QgsMapSettings &settings, const LayerRenderJob &job, const QgsMapRendererCache *cache)
 
- Protected Attributes inherited from QgsMapRendererJob
QgsMapRendererCachemCache = nullptr
 
Errors mErrors
 
QHash< QString, int > mLayerRenderingTimeHints
 Approximate expected layer rendering time per layer, by layer ID. More...
 
QStringList mLayersRedrawnFromCache
 
QHash< QgsWeakMapLayerPointer, int > mPerLayerRenderingTime
 Render time (in ms) per layer, by layer ID. More...
 
bool mRecordRenderingTime = true
 true if layer rendering time should be recorded. More...
 
std::unique_ptr< QgsRenderedItemResultsmRenderedItemResults
 
QElapsedTimer mRenderingStart
 
int mRenderingTime = 0
 
QgsMapSettings mSettings
 

Detailed Description

Job implementation that renders everything sequentially in one thread.

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.

Since
QGIS 2.4

Definition at line 33 of file qgsmaprenderersequentialjob.h.

Constructor & Destructor Documentation

◆ QgsMapRendererSequentialJob()

QgsMapRendererSequentialJob::QgsMapRendererSequentialJob ( const QgsMapSettings settings)

Definition at line 24 of file qgsmaprenderersequentialjob.cpp.

◆ ~QgsMapRendererSequentialJob()

QgsMapRendererSequentialJob::~QgsMapRendererSequentialJob ( )
override

Definition at line 37 of file qgsmaprenderersequentialjob.cpp.

Member Function Documentation

◆ cancel()

void QgsMapRendererSequentialJob::cancel ( )
overridevirtual

Stop the rendering job - does not return until the job has terminated.

Does nothing if the rendering is not active.

Implements QgsMapRendererJob.

Definition at line 77 of file qgsmaprenderersequentialjob.cpp.

◆ cancelWithoutBlocking()

void QgsMapRendererSequentialJob::cancelWithoutBlocking ( )
overridevirtual

Triggers cancellation of the rendering job without blocking.

The render job will continue to operate until it is able to cancel, at which stage the finished() signal will be emitted. Does nothing if the rendering is not active.

Implements QgsMapRendererJob.

Definition at line 88 of file qgsmaprenderersequentialjob.cpp.

◆ internalFinished

void QgsMapRendererSequentialJob::internalFinished ( )
slot

Definition at line 131 of file qgsmaprenderersequentialjob.cpp.

◆ isActive()

bool QgsMapRendererSequentialJob::isActive ( ) const
overridevirtual

Tell whether the rendering job is currently running in background.

Implements QgsMapRendererJob.

Definition at line 105 of file qgsmaprenderersequentialjob.cpp.

◆ renderedImage()

QImage QgsMapRendererSequentialJob::renderedImage ( )
overridevirtual

Gets a preview/resulting image.

Implements QgsMapRendererQImageJob.

Definition at line 121 of file qgsmaprenderersequentialjob.cpp.

◆ takeLabelingResults()

QgsLabelingResults * QgsMapRendererSequentialJob::takeLabelingResults ( )
overridevirtual

Gets pointer to internal labeling engine (in order to get access to the results).

This should not be used if cached labeling was redrawn - see usedCachedLabels().

See also
usedCachedLabels()

Implements QgsMapRendererJob.

Definition at line 115 of file qgsmaprenderersequentialjob.cpp.

◆ usedCachedLabels()

bool QgsMapRendererSequentialJob::usedCachedLabels ( ) const
overridevirtual

Returns true if the render job was able to use a cached labeling solution.

If so, any previously stored labeling results (see takeLabelingResults()) should be retained.

See also
takeLabelingResults()
Since
QGIS 3.0

Implements QgsMapRendererJob.

Definition at line 110 of file qgsmaprenderersequentialjob.cpp.

◆ waitForFinished()

void QgsMapRendererSequentialJob::waitForFinished ( )
overridevirtual

Block until the job has finished.

Implements QgsMapRendererJob.

Definition at line 97 of file qgsmaprenderersequentialjob.cpp.


The documentation for this class was generated from the following files: