commit b30ae7facbdf8273f34f5d67d3d2e9c81db75576
author Constantin Kaplinsky <const@tightvnc.com> Thu May 25 05:04:46 2006 +0000
committer Constantin Kaplinsky <const@tightvnc.com> Thu May 25 05:04:46 2006 +0000
tree 5091b0a7b991672b19c17b86b263e5ff4f173a3e
parent a2adc8d4cfdf7336ce9192414c5e775224742a97

Migrating to new directory structure adopted from the RealVNC's source tree. More changes will follow.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@590 3789f03b-4d11-0410-bbf8-ca57d06f2519

unix/xc/programs/Xserver/vnc/RegionHelper.h

diff --git a/unix/xc/programs/Xserver/vnc/RegionHelper.h b/unix/xc/programs/Xserver/vnc/RegionHelper.h
new file mode 100644
index 0000000..61dc89f
--- /dev/null
+++ b/unix/xc/programs/Xserver/vnc/RegionHelper.h
@@ -0,0 +1,84 @@
+/* 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(&regRec)
+  {
+    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 = &regRec;
+    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 == &regRec) {
+      REGION_UNINIT(pScreen, reg);
+    } else if (reg) {
+      REGION_DESTROY(pScreen, reg);
+    }
+  }
+  ScreenPtr pScreen;
+  RegionRec regRec;
+  RegionPtr reg;
+};
+
+#endif