QGIS API Documentation  2.18.21-Las Palmas (9fba24a)
qgsbrightnesscontrastfilter.h
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1 /***************************************************************************
2  qgsbrightnesscontrastfilter.h
3  -------------------
4  begin : February 2013
5  copyright : (C) 2013 by Alexander Bruy
6  email : alexander dot bruy at gmail dot com
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSBRIGHTNESSCONTRASTFILTER_H
19 #define QGSBRIGHTNESSCONTRASTFILTER_H
20 
21 #include "qgsrasterdataprovider.h"
22 #include "qgsrasterinterface.h"
23 
24 class QDomElement;
25 
30 {
31  public:
34 
35  QgsBrightnessContrastFilter* clone() const override;
36 
37  int bandCount() const override;
38 
39  QGis::DataType dataType( int bandNo ) const override;
40 
41  bool setInput( QgsRasterInterface* input ) override;
42 
43  QgsRasterBlock *block( int bandNo, const QgsRectangle &extent, int width, int height ) override;
44  QgsRasterBlock *block2( int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback* feedback = nullptr ) override;
45 
46  void setBrightness( int brightness ) { mBrightness = qBound( -255, brightness, 255 ); }
47  int brightness() const { return mBrightness; }
48 
49  void setContrast( int contrast ) { mContrast = qBound( -100, contrast, 100 ); }
50  int contrast() const { return mContrast; }
51 
52  void writeXML( QDomDocument& doc, QDomElement& parentElem ) const override;
53 
55  void readXML( const QDomElement& filterElem ) override;
56 
57  private:
59  int adjustColorComponent( int colorComponent, int alpha, int brightness, double contrastFactor ) const;
60 
62  int mBrightness;
63 
65  double mContrast;
66 };
67 
68 #endif // QGSBRIGHTNESSCONTRASTFILTER_H
virtual int bandCount() const =0
Get number of bands.
A rectangle specified with double values.
Definition: qgsrectangle.h:35
virtual void readXML(const QDomElement &filterElem)
Sets base class members from xml.
virtual QgsRasterBlock * block2(int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr)
Read block of data using given extent and size.
Raster data container.
virtual void writeXML(QDomDocument &doc, QDomElement &parentElem) const
Write base class members to xml.
virtual QGis::DataType dataType(int bandNo) const =0
Returns data type for the band specified by number.
Base class for processing filters like renderers, reprojector, resampler etc.
virtual bool setInput(QgsRasterInterface *input)
Set input.
virtual QgsRasterInterface * clone() const =0
Clone itself, create deep copy.
Brightness/contrast filter pipe for rasters.
DataType
Raster data types.
Definition: qgis.h:133
virtual QgsRasterBlock * block(int bandNo, const QgsRectangle &extent, int width, int height)=0
Read block of data using given extent and size.
Feedback object tailored for raster block reading.