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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 <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() {
- }
-
- SimpleUpdateTracker::~SimpleUpdateTracker() {
- }
-
- void SimpleUpdateTracker::add_changed(const Region ®ion) {
- changed.assign_union(region);
- }
-
- void SimpleUpdateTracker::add_copied(const Region &dest, const Point &delta) {
- // 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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