[Bug 12485] New: BitBlt does not ignore source clipping

http://bugs.winehq.org/show_bug.cgi?id=12485

Summary: BitBlt does not ignore source clipping
           Product: Wine
           Version: CVS/GIT
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=12046)
 --> (http://bugs.winehq.org/attachment.cgi?id=12046)
winex11: Ignore source clipping in BitBlt.

Currently X11DRV_ClientSideDIBCopy checks for unhandled clipping modes using:
    if (GetRgnBox(physDevSrc->region, &unusedRect) == COMPLEXREGION ||
        GetRgnBox(physDevDst->region, &unusedRect) == COMPLEXREGION)
However, "BitBlt only does clipping on the destination DC" [source MSDN].

This causes a failure whilst testing cairo, in
test/clip-fill-rule-pixel-aligned targeting a similar ARGB32 surface (i.e it
first draws to an offscreen surface and then blits that to the destination),
which is presumably indicative of a secondary bug along the
X11DRV_ClientSideDIBCopy failure path.