From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 5 Sep 2002 10:54:30 +0000 (+0000)
Subject: fix Union(empty rect) bug
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/57351df0a60b1f2302f66a8d687285c3f5a54fd0?ds=sidebyside

fix Union(empty rect) bug


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16982 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/src/gtk/region.cpp b/src/gtk/region.cpp
index e1394a48b4..7ca7653e2a 100644
--- a/src/gtk/region.cpp
+++ b/src/gtk/region.cpp
@@ -185,6 +185,12 @@ void wxRegion::Clear()
 
 bool wxRegion::Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 {
+    // workaround for a strange GTK/X11 bug: taking union with an empty
+    // rectangle results in an empty region which is definitely not what we
+    // want
+    if ( !width || !height )
+        return TRUE;
+
     GdkRectangle rect;
     rect.x = x;
     rect.y = y;
diff --git a/src/gtk1/region.cpp b/src/gtk1/region.cpp
index e1394a48b4..7ca7653e2a 100644
--- a/src/gtk1/region.cpp
+++ b/src/gtk1/region.cpp
@@ -185,6 +185,12 @@ void wxRegion::Clear()
 
 bool wxRegion::Union( wxCoord x, wxCoord y, wxCoord width, wxCoord height )
 {
+    // workaround for a strange GTK/X11 bug: taking union with an empty
+    // rectangle results in an empty region which is definitely not what we
+    // want
+    if ( !width || !height )
+        return TRUE;
+
     GdkRectangle rect;
     rect.x = x;
     rect.y = y;