qgsblureffect.h

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/***************************************************************************
                             qgsblureffect.h
                             ---------------
    begin                : December 2014
    copyright            : (C) 2014 Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 QGSBLUREFFECT_H
#define QGSBLUREFFECT_H
 
#include "qgis_core.h"
#include "qgspainteffect.h"
#include "qgis_sip.h"
#include "qgis.h"
#include "qgsmapunitscale.h"
 
#include <QPainter>
 
class CORE_EXPORT QgsBlurEffect : public QgsPaintEffect SIP_NODEFAULTCTORS
{
 
  public:
 
    enum BlurMethod
    {
      StackBlur, 
      GaussianBlur 
    };
 
    static QgsPaintEffect *create( const QVariantMap &map ) SIP_FACTORY;
 
    QgsBlurEffect() = default;
 
    QString type() const override { return QStringLiteral( "blur" ); }
    QVariantMap properties() const override;
    void readProperties( const QVariantMap &props ) override;
    QgsBlurEffect *clone() const override SIP_FACTORY;
 
    void setBlurLevel( const double level ) { mBlurLevel = level; }
 
    double blurLevel() const { return mBlurLevel; }
 
    void setBlurUnit( const Qgis::RenderUnit unit ) { mBlurUnit = unit; }
 
    Qgis::RenderUnit blurUnit() const { return mBlurUnit; }
 
    void setBlurMapUnitScale( const QgsMapUnitScale &scale ) { mBlurMapUnitScale = scale; }
 
    const QgsMapUnitScale &blurMapUnitScale() const { return mBlurMapUnitScale; }
 
    void setBlurMethod( const BlurMethod method ) { mBlurMethod = method; }
 
    BlurMethod blurMethod() const { return mBlurMethod; }
 
    void setOpacity( const double opacity ) { mOpacity = opacity; }
 
    double opacity() const { return mOpacity; }
 
    void setBlendMode( const QPainter::CompositionMode mode ) { mBlendMode = mode; }
 
    QPainter::CompositionMode blendMode() const { return mBlendMode; }
 
  protected:
 
    void draw( QgsRenderContext &context ) override;
    QRectF boundingRect( const QRectF &rect, const QgsRenderContext &context ) const override;
 
  private:
 
    double mBlurLevel = 2.645;
    Qgis::RenderUnit mBlurUnit = Qgis::RenderUnit::Millimeters;
    QgsMapUnitScale mBlurMapUnitScale;
    BlurMethod mBlurMethod = StackBlur;
    double mOpacity = 1.0;
    QPainter::CompositionMode mBlendMode = QPainter::CompositionMode_SourceOver;
 
    void drawStackBlur( QgsRenderContext &context );
    void drawGaussianBlur( QgsRenderContext &context );
    void drawBlurredImage( QgsRenderContext &context, QImage &image );
};
 
#endif // QGSBLUREFFECT_H