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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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