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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifndef __RFB_UPDATETRACKER_INCLUDED__
#define __RFB_UPDATETRACKER_INCLUDED__
#include <rfb/Rect.h>
#include <rfb/Region.h>
#include <rfb/PixelBuffer.h>
namespace rfb {
class UpdateInfo {
public:
Region changed;
Region copied;
Point copy_delta;
bool is_empty() const {
return copied.is_empty() && changed.is_empty();
}
// NOTE: We do not ever use UpdateInfo::numRects(), because Tight encoding
// complicates computing the number of rectangles.
/*
int numRects() const {
return copied.numRects() + changed.numRects();
}
*/
};
class UpdateTracker {
public:
UpdateTracker() {};
virtual ~UpdateTracker() {};
virtual void add_changed(const Region ®ion) = 0;
virtual void add_copied(const Region &dest, const Point &delta) = 0;
};
class ClippingUpdateTracker : public UpdateTracker {
public:
ClippingUpdateTracker() : ut(0) {}
ClippingUpdateTracker(UpdateTracker* ut_, const Rect& r=Rect()) : ut(ut_), clipRect(r) {}
void setUpdateTracker(UpdateTracker* ut_) {ut = ut_;}
void setClipRect(const Rect& cr) {clipRect = cr;}
virtual void add_changed(const Region ®ion);
virtual void add_copied(const Region &dest, const Point &delta);
protected:
UpdateTracker* ut;
Rect clipRect;
};
class SimpleUpdateTracker : public UpdateTracker {
public:
SimpleUpdateTracker();
virtual ~SimpleUpdateTracker();
virtual void add_changed(const Region ®ion);
virtual void add_copied(const Region &dest, const Point &delta);
virtual void subtract(const Region& region);
// Fill the supplied UpdateInfo structure with update information
// FIXME: Provide getUpdateInfo() with no clipping, for better efficiency.
virtual void getUpdateInfo(UpdateInfo* info, const Region& cliprgn);
// Copy the contained updates to another tracker
virtual void copyTo(UpdateTracker* to) const;
// Move the entire update region by an offset
void translate(const Point& p) {changed.translate(p); copied.translate(p);}
virtual bool is_empty() const {return changed.is_empty() && copied.is_empty();}
virtual void clear() {changed.clear(); copied.clear();};
protected:
Region changed;
Region copied;
Point copy_delta;
};
}
#endif // __RFB_UPDATETRACKER_INCLUDED__
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