[Bug 20565] New: Emu42: regression in StretchBlt causes black display background

http://bugs.winehq.org/show_bug.cgi?id=20565

Summary: Emu42: regression in StretchBlt causes black display
                    background
           Product: Wine
           Version: 1.1.31
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Emu42 1.12 contains a workaround for the BitBlt problem discussed in
http://bugs.winehq.org/show_bug.cgi?id=4140
This bugzilla entry was split out of above entry, because it is a different
problem.

As noted in http://hp.giesselink.com/Emu42/CHANGES.TXT Emu42 now uses
StretchBlt instead, which worked fine until wine 1.1.30, but no longer in
1.1.31 (and still does not work in .32 and yesterday's git).

I did a git bisect on the regression and tracked it down to:

| 77b9b8a307711bd1f6da30f7d2d5e04faa3f5092 is first bad commit
| commit 77b9b8a307711bd1f6da30f7d2d5e04faa3f5092
| Author: Alexandre Julliard 
| Date:   Wed Sep 30 20:39:51 2009 +0200
|
|     winex11: Move the DIB locking and the client-side optimizations into
| BITBLT_InternalStretchBlt.
|
|     This way they also apply to the non-stretching StretchBlt case.

After this commit the display looks exactly like in previous versions of Emu42
which use BitBlt: extremely dark red pixels on a black background (=
unreadable)