| Constantin Kaplinsky | b30ae7f | 2006-05-25 05:04:46 +0000 | [diff] [blame] | 1 | /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved. |
| 2 | * |
| 3 | * This is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This software is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this software; if not, write to the Free Software |
| 15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 16 | * USA. |
| 17 | */ |
| 18 | #ifndef __REGIONHELPER_H__ |
| 19 | #define __REGIONHELPER_H__ |
| 20 | |
| 21 | // RegionHelper is a class which helps in using X server regions by |
| 22 | // automatically freeing them in the destructor. It also fixes a problem with |
| 23 | // REGION_INIT when given an empty rectangle. |
| 24 | |
| 25 | // REGION_NULL was introduced in the Xorg tree as the way to initialise an |
| 26 | // empty region. If it's not already defined do it the old way. Note that the |
| 27 | // old way causes a segfault in the new tree... |
| 28 | #ifndef REGION_NULL |
| 29 | #define REGION_NULL(pScreen,pReg) REGION_INIT(pScreen,pReg,NullBox,0) |
| 30 | #endif |
| 31 | |
| 32 | class RegionHelper { |
| 33 | public: |
| 34 | |
| 35 | // constructor from a single rect |
| 36 | RegionHelper(ScreenPtr pScreen_, BoxPtr rect, int size) |
| 37 | : pScreen(pScreen_), reg(0) |
| 38 | { |
| 39 | init(rect, size); |
| 40 | } |
| 41 | |
| 42 | // constructor from an existing X server region |
| 43 | RegionHelper(ScreenPtr pScreen_, RegionPtr pRegion) |
| 44 | : pScreen(pScreen_), reg(®Rec) |
| 45 | { |
| 46 | REGION_NULL(pScreen, reg); |
| 47 | REGION_COPY(pScreen, reg, pRegion); |
| 48 | } |
| 49 | |
| 50 | // constructor from an array of rectangles |
| 51 | RegionHelper(ScreenPtr pScreen_, int nrects, xRectanglePtr rects, |
| 52 | int ctype=CT_NONE) |
| 53 | : pScreen(pScreen_) |
| 54 | { |
| 55 | reg = RECTS_TO_REGION(pScreen, nrects, rects, ctype); |
| 56 | } |
| 57 | |
| 58 | // constructor for calling init() later |
| 59 | RegionHelper(ScreenPtr pScreen_) : pScreen(pScreen_), reg(0) { |
| 60 | } |
| 61 | |
| 62 | void init(BoxPtr rect, int size) { |
| 63 | reg = ®Rec; |
| 64 | if (!rect || (rect && (rect->x2 == rect->x1 || rect->y2 == rect->y1))) { |
| 65 | REGION_NULL(pScreen, reg); |
| 66 | } else { |
| 67 | REGION_INIT(pScreen, reg, rect, size); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | // destructor frees as appropriate |
| 72 | ~RegionHelper() { |
| 73 | if (reg == ®Rec) { |
| 74 | REGION_UNINIT(pScreen, reg); |
| 75 | } else if (reg) { |
| 76 | REGION_DESTROY(pScreen, reg); |
| 77 | } |
| 78 | } |
| 79 | ScreenPtr pScreen; |
| 80 | RegionRec regRec; |
| 81 | RegionPtr reg; |
| 82 | }; |
| 83 | |
| 84 | #endif |