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/* This file is part of the KDE project
* Copyright (c) 2010 Jan Hambrecht <jaham@gmx.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef CONVOLVEMATRIXEFFECT_H
#define CONVOLVEMATRIXEFFECT_H
#include "KoFilterEffect.h"
#include <QPointF>
#include <QVector>
#define ConvolveMatrixEffectId "feConvolveMatrix"
class KoFilterEffectLoadingContext;
/// A convolve matrix effect
class ConvolveMatrixEffect : public KoFilterEffect
{
public:
/// Edge mode, i.e. how the kernel behaves at image edges
enum EdgeMode {
Duplicate, ///< duplicates colors at the edges
Wrap, ///< takes the colors at the opposite edge
None ///< uses values of zero for each color channel
};
ConvolveMatrixEffect();
/// Returns the order of the kernel matrix
QPoint order() const;
/// Sets the order of the kernel matrix
void setOrder(const QPoint &order);
/// Returns the kernel matrix
QVector<qreal> kernel() const;
/// Sets the kernel matrix
void setKernel(const QVector<qreal> &kernel);
/// Returns the divisor
qreal divisor() const;
/// Sets the divisor
void setDivisor(qreal divisor);
/// Returns the bias
qreal bias() const;
/// Sets the bias
void setBias(qreal bias);
/// Returns the target cell within the kernel
QPoint target() const;
/// Sets the target cell within the kernel
void setTarget(const QPoint &target);
/// Returns edge mode
EdgeMode edgeMode() const;
/// Sets the edge mode
void setEdgeMode(EdgeMode edgeMode);
/// Returns if alpha values are preserved
bool isPreserveAlphaEnabled() const;
/// Enables/disables preserving alpha values
void enablePreserveAlpha(bool on);
/// reimplemented from KoFilterEffect
QImage processImage(const QImage &image, const KoFilterEffectRenderContext &context) const override;
/// reimplemented from KoFilterEffect
bool load(const KoXmlElement &element, const KoFilterEffectLoadingContext &context) override;
/// reimplemented from KoFilterEffect
void save(KoXmlWriter &writer) override;
private:
void setDefaults();
QPoint m_order; ///< the dimension of the kernel
QVector<qreal> m_kernel; ///< the kernel
qreal m_divisor; ///< the divisor
qreal m_bias; ///< the bias
QPoint m_target; ///< target cell within the kernel
EdgeMode m_edgeMode; ///< the edge mode
QPointF m_kernelUnitLength; ///< the kernel unit length
bool m_preserveAlpha; ///< indicates if original alpha values are left intact
};
#endif // CONVOLVEMATRIXEFFECT_H
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