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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 __REGIONHELPER_H__
- #define __REGIONHELPER_H__
-
- // RegionHelper is a class which helps in using X server regions by
- // automatically freeing them in the destructor. It also fixes a problem with
- // REGION_INIT when given an empty rectangle.
-
- // REGION_NULL was introduced in the Xorg tree as the way to initialise an
- // empty region. If it's not already defined do it the old way. Note that the
- // old way causes a segfault in the new tree...
- #ifndef REGION_NULL
- #define REGION_NULL(pScreen,pReg) REGION_INIT(pScreen,pReg,NullBox,0)
- #endif
-
- class RegionHelper {
- public:
-
- // constructor from a single rect
- RegionHelper(ScreenPtr pScreen_, BoxPtr rect, int size)
- : pScreen(pScreen_), reg(0)
- {
- init(rect, size);
- }
-
- // constructor from an existing X server region
- RegionHelper(ScreenPtr pScreen_, RegionPtr pRegion)
- : pScreen(pScreen_), reg(®Rec)
- {
- REGION_NULL(pScreen, reg);
- REGION_COPY(pScreen, reg, pRegion);
- }
-
- // constructor from an array of rectangles
- RegionHelper(ScreenPtr pScreen_, int nrects, xRectanglePtr rects,
- int ctype=CT_NONE)
- : pScreen(pScreen_)
- {
- reg = RECTS_TO_REGION(pScreen, nrects, rects, ctype);
- }
-
- // constructor for calling init() later
- RegionHelper(ScreenPtr pScreen_) : pScreen(pScreen_), reg(0) {
- }
-
- void init(BoxPtr rect, int size) {
- reg = ®Rec;
- if (!rect || (rect && (rect->x2 == rect->x1 || rect->y2 == rect->y1))) {
- REGION_NULL(pScreen, reg);
- } else {
- REGION_INIT(pScreen, reg, rect, size);
- }
- }
-
- // destructor frees as appropriate
- ~RegionHelper() {
- if (reg == ®Rec) {
- REGION_UNINIT(pScreen, reg);
- } else if (reg) {
- REGION_DESTROY(pScreen, reg);
- }
- }
- ScreenPtr pScreen;
- RegionRec regRec;
- RegionPtr reg;
- };
-
- #endif
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