qgshillshadefilter.h

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/***************************************************************************
                          qgshillshadefilter.h  -  description
                          --------------------------------
    begin                : September 26th, 2011
    copyright            : (C) 2011 by Marco Hugentobler
    email                : marco dot hugentobler at sourcepole dot ch
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSHILLSHADEFILTER_H
#define QGSHILLSHADEFILTER_H
 
#include "qgis_analysis.h"
#include "qgsderivativefilter.h"
 
#include <QString>
 
using namespace Qt::StringLiterals;

class ANALYSIS_EXPORT QgsHillshadeFilter : public QgsDerivativeFilter
{
  public:
    QgsHillshadeFilter( const QString &inputFile, const QString &outputFile, const QString &outputFormat, double lightAzimuth = 300, double lightAngle = 40 );
 
    float processNineCellWindow( float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33 ) override;
 
    float lightAzimuth() const { return mLightAzimuth; }
    void setLightAzimuth( float azimuth );
    float lightAngle() const { return mLightAngle; }
    void setLightAngle( float angle );
 
  private:
#ifdef HAVE_OPENCL
 
    const QString openClProgramBaseName() const override { return u"hillshade"_s; }
#endif
 
    float mLightAzimuth;
    float mLightAngle;
    // Precalculate for speed:
    float mCosZenithRad;
    float mSinZenithRad;
    float mAzimuthRad;
 
 
#ifdef HAVE_OPENCL
  private:
    void addExtraRasterParams( std::vector<float> &params ) override;
#endif
};
 
#endif // QGSHILLSHADEFILTER_H