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/*
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* Copyright (c) 2004 Cyrille Berger <cberger@cberger.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _KIS_FILTER_H_
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#define _KIS_FILTER_H_
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#include <list>
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#include <tqstring.h>
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#include <ksharedptr.h>
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#include <klocale.h>
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#include "kis_types.h"
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#include "kis_filter_registry.h"
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#include "kis_id.h"
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#include "kis_paint_device.h"
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#include "kis_progress_subject.h"
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#include "kis_filter_configuration.h"
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#include "kis_colorspace.h"
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#include "koffice_export.h"
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class KisColorSpace;
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class KisPreviewDialog;
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class KisProgressDisplayInterface;
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class KisFilterConfigWidget;
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class TQWidget;
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/**
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* Basic interface of a Chalk filter.
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*/
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class KRITACORE_EXPORT KisFilter : public KisProgressSubject, public KShared {
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Q_OBJECT
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public:
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/**
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* Construct a Chalk filter
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*/
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KisFilter(const KisID& id, const TQString & category, const TQString & entry);
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virtual ~KisFilter() {}
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public:
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virtual void setProgressDisplay(KisProgressDisplayInterface * progressDisplay);
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virtual void process(KisPaintDeviceSP src, KisPaintDeviceSP dst, KisFilterConfiguration*, const TQRect&) = 0;
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public:
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/**
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* @return a new configuration derived from the widget. If the widget is NULL or not the correct type,
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* a default configuration object will be returned
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*/
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virtual KisFilterConfiguration * configuration(TQWidget*);
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/**
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* @return a default configuration object
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* Normally this doesn't need to be overriden
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*/
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virtual KisFilterConfiguration * configuration();
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/**
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* If true, this filter can be used in painting tools as a paint operation
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*/
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virtual bool supportsPainting() { return false; };
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/// This filter can be displayed in a preview dialog
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virtual bool supportsPreview() { return false; };
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/// This filter can be used in adjustment layers
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// XXX: This uses supportsPreview() for backwards compatibility
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virtual bool supportsAdjustmentLayers() { return supportsPreview(); };
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/**
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* Return a list of default configuration to demonstrates the use of the filter
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* @return a list with a null element if the filter do not use a configuration
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*/
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virtual std::list<KisFilterConfiguration*> listOfExamplesConfiguration(KisPaintDeviceSP )
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{ std::list<KisFilterConfiguration*> list; list.insert(list.begin(), 0); return list; }
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/**
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* Can this filter work incrementally when painting, or do we need to work
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* on the state as it was before painting started. The former is faster.
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*/
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virtual bool supportsIncrementalPainting() { return true; };
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/**
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* This filter supports cutting up the work area and filtering
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* each chunk in a separate thread. Filters that need access to the
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* whole area for correct computations should return false.
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*/
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virtual bool supportsThreading() { return true; };
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/**
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* Used when threading is used -- the overlap margin is passed to the
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* filter to use to compute pixels, but the margin is not pasted into the
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* resulting image.
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*/
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virtual int overlapMarginNeeded(KisFilterConfiguration* = 0) const { return 0; };
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/**
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* Similar to overlapMarginNeeded: some filters will alter a lot of pixels that are
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* near to each other at the same time. So when you changed a single rectangle
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* in a device, the actual rectangle that will feel the influence of this change
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* might be bigger. Use this function to detirmine that rect.
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* The default implementation makes a guess using overlapMarginNeeded.
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*/
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virtual TQRect enlargeRect(TQRect rect, KisFilterConfiguration* = 0) const;
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/**
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* Determine the colorspace independence of this filter.
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* @see ColorSpaceIndependence
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*
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* @return the degree of independence
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*/
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virtual ColorSpaceIndependence colorSpaceIndependence() { return TO_RGBA8; };
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/**
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* Determine if this filter can work with this colorSpace. For instance, some
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* colorspaces don't depend on lcms, and cannot do certain tasks. The colorsfilters
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* are problems here.
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* BSAR: I'm still not convinced that this is the right approach. I think that every
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* colorspace should implement the api fully; and that the filter should simply call
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* that api. After all, you don't need lcms to desaturate.
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*
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* @param colorsSpace
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*/
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virtual bool workWith(KisColorSpace*) { return true; }
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virtual void enableProgress();
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virtual void disableProgress();
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bool autoUpdate();
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// Unique identification for this filter
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inline const KisID id() const { return m_id; };
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// Which submenu in the filters menu does filter want to go?
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inline TQString menuCategory() const { return m_category; };
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// The i18n'ed string this filter wants to show itself in the menu
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inline TQString menuEntry() const { return m_entry; };
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/**
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* Create the configuration widget for this filter.
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*
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* @param parent the TQt owner widget of this widget
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* @param dev the paintdevice this filter will act on
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* @return NULL if the filter does not use user-settable configuration settings.
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* else return a pointer to the new configuration widget
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*/
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virtual KisFilterConfigWidget * createConfigurationWidget(TQWidget * parent, KisPaintDeviceSP dev);
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virtual void cancel() { m_cancelRequested = true; }
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virtual void setAutoUpdate(bool set);
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bool progressEnabled() const { return m_progressEnabled; }
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inline bool cancelRequested() const { return m_progressEnabled && m_cancelRequested; }
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protected slots:
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// Convenience functions for progress display.
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void setProgressTotalSteps(TQ_INT32 totalSteps);
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void setProgress(TQ_INT32 progress);
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void incProgress();
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void setProgressStage(const TQString& stage, TQ_INT32 progress);
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void setProgressDone();
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inline TQ_INT32 progress() { return m_progressSteps; }
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private:
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bool m_cancelRequested;
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bool m_progressEnabled;
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bool m_autoUpdate;
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protected:
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TQ_INT32 m_progressTotalSteps;
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TQ_INT32 m_lastProgressPerCent;
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TQ_INT32 m_progressSteps;
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KisID m_id;
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KisProgressDisplayInterface * m_progressDisplay;
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TQString m_category; // The category in the filter menu this filter fits
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TQString m_entry; // the i18n'ed accelerated menu text
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};
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#endif
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