From 564b429f742138a75aeb183a1cb8fc139767de70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=A1clav=20Slav=C3=ADk?= <vslavik@fastmail.fm>
Date: Tue, 12 Sep 2006 09:26:14 +0000
Subject: [PATCH] limit clipping to surface area

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41171 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/dfb/dc.cpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/dfb/dc.cpp b/src/dfb/dc.cpp
index 1b16ef396b..72b7ff8138 100644
--- a/src/dfb/dc.cpp
+++ b/src/dfb/dc.cpp
@@ -92,11 +92,16 @@ void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
 {
     wxCHECK_RET( Ok(), wxT("invalid dc") );
 
+    wxSize size(GetSize());
+
+    // NB: We intersect the clipping rectangle with surface's area here because
+    //     DirectFB will return an error if you try to set clipping rectangle
+    //     that is partially outside of the surface.
     DFBRegion r;
-    r.x1 = XLOG2DEV(cx);
-    r.y1 = YLOG2DEV(cy);
-    r.x2 = r.x1 + XLOG2DEVREL(cw) - 1;
-    r.y2 = r.y1 + YLOG2DEVREL(ch) - 1;
+    r.x1 = wxMax(0, XLOG2DEV(cx));
+    r.y1 = wxMax(0, YLOG2DEV(cy));
+    r.x2 = wxMin(r.x1 + XLOG2DEVREL(cw), size.x) - 1;
+    r.y2 = wxMin(r.y1 + YLOG2DEVREL(ch), size.y) - 1;
 
     if ( !m_surface->SetClip(&r) )
         return;