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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_COMPARINGUPDATETRACKER_H__
#define __RFB_COMPARINGUPDATETRACKER_H__
#include <rfb/UpdateTracker.h>
namespace rfb {
class ComparingUpdateTracker : public SimpleUpdateTracker {
public:
ComparingUpdateTracker(PixelBuffer* buffer);
~ComparingUpdateTracker();
// compare() does the comparison and reduces its changed and copied regions
// as appropriate. Returns true if the regions were altered.
virtual bool compare();
// enable()/disable() turns the comparing functionality on/off. With it
// disabled, the object will behave like a dumb update tracker (i.e.
// compare() will be a no-op). It is harmless to repeatedly call these
// methods.
virtual void enable();
virtual void disable();
private:
void compareRect(const Rect& r, Region* newchanged);
PixelBuffer* fb;
ManagedPixelBuffer oldFb;
bool firstCompare;
bool enabled;
};
}
#endif
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