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-rw-r--r--rfb/Region.cxx248
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diff --git a/rfb/Region.cxx b/rfb/Region.cxx
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--- a/rfb/Region.cxx
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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.
- */
-
-// Cross-platform Region class based on the X11 region implementation. Note
-// that for efficiency this code manipulates the Xlib region structure
-// directly. Apart from the layout of the structure, there is one other key
-// assumption made: a Region returned from XCreateRegion must always have its
-// rects member allocated so that there is space for at least one rectangle.
-//
-
-#include <rfb/Region.h>
-#include <Xregion/Xregion.h>
-#include <Xregion/region.h>
-#include <assert.h>
-#include <stdio.h>
-
-// A _RectRegion must never be passed as a return parameter to the Xlib region
-// operations. This is because for efficiency its "rects" member has not been
-// allocated with Xmalloc. It is however safe to pass it as an input
-// parameter.
-
-class _RectRegion {
-public:
- _RectRegion(const rfb::Rect& r) {
- region.rects = &region.extents;
- region.numRects = 1;
- region.extents.x1 = r.tl.x;
- region.extents.y1 = r.tl.y;
- region.extents.x2 = r.br.x;
- region.extents.y2 = r.br.y;
- region.size = 1;
- if (r.is_empty())
- region.numRects = 0;
- }
- REGION region;
-};
-
-
-rfb::Region::Region() {
- xrgn = XCreateRegion();
- assert(xrgn);
-}
-
-rfb::Region::Region(const Rect& r) {
- xrgn = XCreateRegion();
- assert(xrgn);
- reset(r);
-}
-
-rfb::Region::Region(const rfb::Region& r) {
- xrgn = XCreateRegion();
- assert(xrgn);
- XUnionRegion(xrgn, r.xrgn, xrgn);
-}
-
-rfb::Region::~Region() {
- XDestroyRegion(xrgn);
-}
-
-rfb::Region& rfb::Region::operator=(const rfb::Region& r) {
- clear();
- XUnionRegion(xrgn, r.xrgn, xrgn);
- return *this;
-}
-
-void rfb::Region::clear() {
- xrgn->numRects = 0;
- xrgn->extents.x1 = 0;
- xrgn->extents.y1 = 0;
- xrgn->extents.x2 = 0;
- xrgn->extents.y2 = 0;
-}
-
-void rfb::Region::reset(const Rect& r) {
- if (r.is_empty()) {
- clear();
- } else {
- xrgn->numRects = 1;
- xrgn->rects[0].x1 = xrgn->extents.x1 = r.tl.x;
- xrgn->rects[0].y1 = xrgn->extents.y1 = r.tl.y;
- xrgn->rects[0].x2 = xrgn->extents.x2 = r.br.x;
- xrgn->rects[0].y2 = xrgn->extents.y2 = r.br.y;
- }
-}
-
-void rfb::Region::translate(const Point& delta) {
- XOffsetRegion(xrgn, delta.x, delta.y);
-}
-
-void rfb::Region::setOrderedRects(const std::vector<Rect>& rects) {
- clear();
- std::vector<Rect>::const_iterator i;
- for (i=rects.begin(); i != rects.end(); i++) {
- _RectRegion rr(*i);
- XUnionRegion(xrgn, &rr.region, xrgn);
- }
-}
-
-void rfb::Region::setExtentsAndOrderedRects(const ShortRect* extents,
- int nRects, const ShortRect* rects)
-{
- if (xrgn->size < nRects)
- {
- BOX* prevRects = xrgn->rects;
- xrgn->rects = (BOX*)Xrealloc((char*)xrgn->rects, nRects * sizeof(BOX));
- if (!xrgn->rects) {
- fprintf(stderr,"Xrealloc failed\n");
- Xfree(prevRects);
- return;
- }
- xrgn->size = nRects;
- }
-
- xrgn->numRects = nRects;
- xrgn->extents.x1 = extents->x1;
- xrgn->extents.y1 = extents->y1;
- xrgn->extents.x2 = extents->x2;
- xrgn->extents.y2 = extents->y2;
- for (int i = 0; i < nRects; i++) {
- xrgn->rects[i].x1 = rects[i].x1;
- xrgn->rects[i].y1 = rects[i].y1;
- xrgn->rects[i].x2 = rects[i].x2;
- xrgn->rects[i].y2 = rects[i].y2;
- }
-}
-
-void rfb::Region::copyFrom(const rfb::Region& r) {
- XUnionRegion(r.xrgn, r.xrgn, xrgn);
-}
-
-void rfb::Region::assign_intersect(const rfb::Region& r) {
- XIntersectRegion(xrgn, r.xrgn, xrgn);
-}
-
-void rfb::Region::assign_union(const rfb::Region& r) {
- XUnionRegion(xrgn, r.xrgn, xrgn);
-}
-
-void rfb::Region::assign_subtract(const rfb::Region& r) {
- XSubtractRegion(xrgn, r.xrgn, xrgn);
-}
-
-rfb::Region rfb::Region::intersect(const rfb::Region& r) const {
- rfb::Region ret;
- XIntersectRegion(xrgn, r.xrgn, ret.xrgn);
- return ret;
-}
-
-rfb::Region rfb::Region::union_(const rfb::Region& r) const {
- rfb::Region ret;
- XUnionRegion(xrgn, r.xrgn, ret.xrgn);
- return ret;
-}
-
-rfb::Region rfb::Region::subtract(const rfb::Region& r) const {
- rfb::Region ret;
- XSubtractRegion(xrgn, r.xrgn, ret.xrgn);
- return ret;
-}
-
-bool rfb::Region::equals(const rfb::Region& r) const {
- return XEqualRegion(xrgn, r.xrgn);
-}
-
-int rfb::Region::numRects() const {
- return xrgn->numRects;
-}
-
-bool rfb::Region::get_rects(std::vector<Rect>* rects,
- bool left2right, bool topdown, int maxArea) const
-{
- int nRects = xrgn->numRects;
- int xInc = left2right ? 1 : -1;
- int yInc = topdown ? 1 : -1;
- int i = topdown ? 0 : nRects-1;
- rects->clear();
- rects->reserve(nRects);
-
- while (nRects > 0) {
- int firstInNextBand = i;
- int nRectsInBand = 0;
-
- while (nRects > 0 && xrgn->rects[firstInNextBand].y1 == xrgn->rects[i].y1)
- {
- firstInNextBand += yInc;
- nRects--;
- nRectsInBand++;
- }
-
- if (xInc != yInc)
- i = firstInNextBand - yInc;
-
- while (nRectsInBand > 0) {
- int y = xrgn->rects[i].y1;
- int h = maxArea / (xrgn->rects[i].x2 - xrgn->rects[i].x1);
- if (!h) h = xrgn->rects[i].y2 - y;
- do {
- if (h > xrgn->rects[i].y2 - y)
- h = xrgn->rects[i].y2 - y;
- Rect r(xrgn->rects[i].x1, y, xrgn->rects[i].x2, y+h);
- rects->push_back(r);
- y += h;
- } while (y < xrgn->rects[i].y2);
- i += xInc;
- nRectsInBand--;
- }
-
- i = firstInNextBand;
- }
-
- return !rects->empty();
-}
-
-rfb::Rect rfb::Region::get_bounding_rect() const {
- return Rect(xrgn->extents.x1, xrgn->extents.y1,
- xrgn->extents.x2, xrgn->extents.y2);
-}
-
-
-void rfb::Region::debug_print(const char* prefix) const
-{
- fprintf(stderr,"%s num rects %3ld extents %3d,%3d %3dx%3d\n",
- prefix, xrgn->numRects, xrgn->extents.x1, xrgn->extents.y1,
- xrgn->extents.x2-xrgn->extents.x1,
- xrgn->extents.y2-xrgn->extents.y1);
-
- for (int i = 0; i < xrgn->numRects; i++) {
- fprintf(stderr," rect %3d,%3d %3dx%3d\n",
- xrgn->rects[i].x1, xrgn->rects[i].y1,
- xrgn->rects[i].x2-xrgn->rects[i].x1,
- xrgn->rects[i].y2-xrgn->rects[i].y1);
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-08 00:59:02 +0000