QGIS API Documentation  3.23.0-Master (eb871beae0)
qgsrasterlayerrenderer.h
Go to the documentation of this file.
1 /***************************************************************************
2  qgsrasterlayerrenderer.h
3  --------------------------------------
4  Date : December 2013
5  Copyright : (C) 2013 by Martin Dobias
6  Email : wonder dot sk at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSRASTERLAYERRENDERER_H
17 #define QGSRASTERLAYERRENDERER_H
18 
19 #define SIP_NO_FILE
20 
21 #include "qgsmaplayerrenderer.h"
22 #include "qgsrasterdataprovider.h"
23 #include "qgsmapclippingregion.h"
24 
25 class QPainter;
26 
27 class QgsMapToPixel;
28 class QgsRasterLayer;
29 class QgsRasterPipe;
30 struct QgsRasterViewPort;
31 class QgsRenderContext;
32 
34 
35 #include "qgsrasterinterface.h"
36 
38 
45 class CORE_EXPORT QgsRasterLayerRendererFeedback : public QgsRasterBlockFeedback
46 {
47  Q_OBJECT
48 
49  public:
51  explicit QgsRasterLayerRendererFeedback( QgsRasterLayerRenderer *r );
52 
54  void onNewData() override;
55  private:
56  QgsRasterLayerRenderer *mR = nullptr;
57  int mMinimalPreviewInterval;
58  QTime mLastPreview;
59 };
60 
62 
70 class CORE_EXPORT QgsRasterLayerRenderer : public QgsMapLayerRenderer
71 {
72  public:
73  QgsRasterLayerRenderer( QgsRasterLayer *layer, QgsRenderContext &rendererContext );
74  ~QgsRasterLayerRenderer() override;
75 
76  bool render() override;
77  QgsFeedback *feedback() const override;
78  bool forceRasterRender() const override;
79 
80  private:
81 
82  QgsRasterViewPort *mRasterViewPort = nullptr;
83 
84  QgsRasterPipe *mPipe = nullptr;
85 
86  QgsRasterDataProvider::Capability mProviderCapabilities;
87 
89  QgsRasterLayerRendererFeedback *mFeedback = nullptr;
90 
91  QList< QgsMapClippingRegion > mClippingRegions;
92 
93  friend class QgsRasterLayerRendererFeedback;
94 };
95 
96 
97 #endif // QGSRASTERLAYERRENDERER_H
Base class for feedback objects to be used for cancellation of something running in a worker thread.
Definition: qgsfeedback.h:45
Base class for utility classes that encapsulate information necessary for rendering of map layers.
Perform transforms between map coordinates and device coordinates.
Definition: qgsmaptopixel.h:39
Feedback object tailored for raster block reading.
virtual void onNewData()
May be emitted by raster data provider to indicate that some partial data are available and a new pre...
Capability
If you add to this, please also add to capabilitiesString()
Implementation of threaded rendering for raster layers.
Represents a raster layer.
Contains a pipeline of raster interfaces for sequential raster processing.
Definition: qgsrasterpipe.h:50
Contains information about the context of a rendering operation.
This class provides details of the viewable area that a raster will be rendered into.