/usr/include/qgis/qgsblureffect.h is in libqgis-dev 2.14.11+dfsg-3+deb9u1.
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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 "qgspainteffect.h"
#include "qgis.h"
#include <QPainter>
/** \ingroup core
* \class QgsBlurEffect
* \brief A paint effect which blurs a source picture, using a number of different blur
* methods.
*
* \note Added in version 2.9
*/
class CORE_EXPORT QgsBlurEffect : public QgsPaintEffect
{
public:
/** Available blur methods (algorithms) */
enum BlurMethod
{
StackBlur, /*!< stack blur, a fast but low quality blur. Valid blur level values are between 0 - 16.*/
GaussianBlur /*!< Gaussian blur, a slower but high quality blur. Blur level values are the distance in pixels for the blur operation. */
};
/** Creates a new QgsBlurEffect effect from a properties string map.
* @param map encoded properties string map
* @returns new QgsBlurEffect
*/
static QgsPaintEffect* create( const QgsStringMap& map );
QgsBlurEffect();
virtual ~QgsBlurEffect();
virtual QString type() const override { return QString( "blur" ); }
virtual QgsStringMap properties() const override;
virtual void readProperties( const QgsStringMap& props ) override;
virtual QgsBlurEffect* clone() const override;
/** Sets blur level (strength)
* @param level blur level. Depending on the current @link blurMethod @endlink, this parameter
* has different effects
* @see blurLevel
* @see blurMethod
*/
void setBlurLevel( const int level ) { mBlurLevel = level; }
/** Returns the blur level (strength)
* @returns blur level. Depending on the current @link blurMethod @endlink, this parameter
* has different effects
* @see setBlurLevel
* @see blurMethod
*/
int blurLevel() const { return mBlurLevel; }
/** Sets the blur method (algorithm) to use for performing the blur.
* @param method blur method
* @see blurMethod
*/
void setBlurMethod( const BlurMethod method ) { mBlurMethod = method; }
/** Returns the blur method (algorithm) used for performing the blur.
* @returns blur method
* @see setBlurMethod
*/
BlurMethod blurMethod() const { return mBlurMethod; }
/** Sets the transparency for the effect
* @param transparency double between 0 and 1 inclusive, where 0 is fully opaque
* and 1 is fully transparent
* @see transparency
*/
void setTransparency( const double transparency ) { mTransparency = transparency; }
/** Returns the transparency for the effect
* @returns transparency value between 0 and 1 inclusive, where 0 is fully opaque
* and 1 is fully transparent
* @see setTransparency
*/
double transparency() const { return mTransparency; }
/** Sets the blend mode for the effect
* @param mode blend mode used for drawing the effect on to a destination
* paint device
* @see blendMode
*/
void setBlendMode( const QPainter::CompositionMode mode ) { mBlendMode = mode; }
/** Returns the blend mode for the effect
* @returns blend mode used for drawing the effect on to a destination
* paint device
* @see setBlendMode
*/
QPainter::CompositionMode blendMode() const { return mBlendMode; }
protected:
virtual void draw( QgsRenderContext& context ) override;
virtual QRectF boundingRect( const QRectF& rect, const QgsRenderContext& context ) const override;
private:
int mBlurLevel;
BlurMethod mBlurMethod;
double mTransparency;
QPainter::CompositionMode mBlendMode;
void drawStackBlur( QgsRenderContext &context );
void drawGaussianBlur( QgsRenderContext &context );
void drawBlurredImage( QgsRenderContext& context, QImage &image );
};
#endif // QGSBLUREFFECT_H
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