Avoid intersecting screen with empty clipList in vncHooksCopyArea. The

result would be empty, which means that we are not sending CopyRect
updates even though we can. Improves vertical scrolling with Firefox
and Adobe reader.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4324 3789f03b-4d11-0410-bbf8-ca57d06f2519

diff --git a/unix/xserver/hw/vnc/vncHooks.cc b/unix/xserver/hw/vnc/vncHooks.cc
index 1bf61a383893b749960ee32a7bd31795548e63a3..75191112d63f70cfba9e87d682877806704d0358 100644 (file)
--- a/unix/xserver/hw/vnc/vncHooks.cc
+++ b/unix/xserver/hw/vnc/vncHooks.cc
@@ -816,7 +816,9 @@ static RegionPtr vncHooksCopyArea(DrawablePtr pSrc, DrawablePtr pDst,
     box.y2 = box.y1 + h;
 
     src.init(&box, 0);
-    REGION_INTERSECT(pScreen, src.reg, src.reg, &((WindowPtr)pSrc)->clipList);
+    if (REGION_NOTEMPTY(pScreen, &((WindowPtr)pSrc)->clipList)) {
+       REGION_INTERSECT(pScreen, src.reg, src.reg, &((WindowPtr)pSrc)->clipList);
+    }
     REGION_TRANSLATE(pScreen, src.reg,
                      dstx + pDst->x - srcx - pSrc->x,
                      dsty + pDst->y - srcy - pSrc->y);