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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.
*/
// -=- rfbUpdateTracker.cpp
//
// Tracks updated regions and a region-copy event, too
//
#include <assert.h>
#include <rfb/UpdateTracker.h>
#include <rfb/LogWriter.h>
using namespace rfb;
static LogWriter vlog("UpdateTracker");
// -=- ClippingUpdateTracker
void ClippingUpdateTracker::add_changed(const Region ®ion) {
ut->add_changed(region.intersect(clipRect));
}
void ClippingUpdateTracker::add_copied(const Region &dest, const Point &delta) {
// Clip the destination to the display area
Region clipdest = dest.intersect(clipRect);
if (clipdest.is_empty()) return;
// Clip the source to the screen
Region tmp = clipdest;
tmp.translate(delta.negate());
tmp.assign_intersect(clipRect);
if (!tmp.is_empty()) {
// Translate the source back to a destination region
tmp.translate(delta);
// Pass the copy region to the child tracker
ut->add_copied(tmp, delta);
}
// And add any bits that we had to remove to the changed region
tmp = clipdest.subtract(tmp);
if (!tmp.is_empty())
ut->add_changed(tmp);
}
// SimpleUpdateTracker
SimpleUpdateTracker::SimpleUpdateTracker(bool use_copyrect) {
copy_enabled = use_copyrect;
}
SimpleUpdateTracker::~SimpleUpdateTracker() {
}
void SimpleUpdateTracker::enable_copyrect(bool enable) {
if (!enable && copy_enabled) {
add_changed(copied);
copied.clear();
}
copy_enabled=enable;
}
void SimpleUpdateTracker::add_changed(const Region ®ion) {
changed.assign_union(region);
}
void SimpleUpdateTracker::add_copied(const Region &dest, const Point &delta) {
// Do we support copyrect?
if (!copy_enabled) {
add_changed(dest);
return;
}
// Is there anything to do?
if (dest.is_empty()) return;
// Calculate whether any of this copy can be treated as a continuation
// of an earlier one
Region src = dest;
src.translate(delta.negate());
Region overlap = src.intersect(copied);
if (overlap.is_empty()) {
// There is no overlap
Rect newbr = dest.get_bounding_rect();
Rect oldbr = copied.get_bounding_rect();
if (oldbr.area() > newbr.area()) {
// Old copyrect is (probably) bigger - use it
changed.assign_union(dest);
} else {
// New copyrect is probably bigger
// Use the new one
// But be careful not to copy stuff that still needs
// to be updated.
Region invalid_src = src.intersect(changed);
invalid_src.translate(delta);
changed.assign_union(invalid_src);
changed.assign_union(copied);
copied = dest;
copy_delta = delta;
}
return;
}
Region invalid_src = overlap.intersect(changed);
invalid_src.translate(delta);
changed.assign_union(invalid_src);
overlap.translate(delta);
Region nonoverlapped_copied = dest.union_(copied).subtract(overlap);
changed.assign_union(nonoverlapped_copied);
copied = overlap;
copy_delta = copy_delta.translate(delta);
return;
}
void SimpleUpdateTracker::subtract(const Region& region) {
copied.assign_subtract(region);
changed.assign_subtract(region);
}
void SimpleUpdateTracker::getUpdateInfo(UpdateInfo* info, const Region& clip)
{
copied.assign_subtract(changed);
info->changed = changed.intersect(clip);
info->copied = copied.intersect(clip);
info->copy_delta = copy_delta;
}
void SimpleUpdateTracker::copyTo(UpdateTracker* to) const {
if (!copied.is_empty())
to->add_copied(copied, copy_delta);
if (!changed.is_empty())
to->add_changed(changed);
}
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