[Bug 27470] New: UpdateLayeredWindow API returns 'success' but doesn't work

http://bugs.winehq.org/show_bug.cgi?id=27470

Summary: UpdateLayeredWindow API returns 'success' but doesn't
                    work
           Product: Wine
           Version: 1.3.22
          Platform: x86
               URL: http://www.imgburn.com/
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=35124)
 --> (http://bugs.winehq.org/attachment.cgi?id=35124)
3 screenshots showing what the splash screen should look/looks like

I make use of the 'UpdateLayeredWindow' to create/display a fancy looking
transparent splash screen whilst my program (ImgBurn) loads everything it needs
to.

I noticed that 'fancy' splash screen isn't shown under Wine (checked against
v1.3.22 in Ubuntu 11.04). Instead you just see bits of my fallback / legacy
splash screen for old Windows OS (95/98/Me etc) - these are not normally
visible.

Having stepped through all my code, it would appear Wine lies about my call to
'UpdateLayeredWindow' being successful. (If it's not supported/successful, the
program knows to revert to the old splash screen)

I noticed 'IsoBuster' shows a similar layered style splash screen when it loads
in Windows so I tried that under Wine/Ubuntu too - same issue. All you get in
that app is a blank grey box on the screen though.

In order to make it clear that the splash screen isn't functioning correctly,
I've added another set of 'Wine' related images/text to it. These are now the
only ones set to 'visible=true' when 'UpdateLayeredWindow' is supposed to have
worked - but of course they wouldn't normally be visible because the layered
image would be.

I've attached 3 screenshot images.

1. LayeredSplashScreen.png - showing what a layered splash screen looks like -
captured in Windows Vista.

2. StandardSplashScreen.png - showing what a standard/fallback splash screen
looks like (displayed when 'UpdateLayeredWindow' isn't supported/successful) -
captured in Windows Vista having forced the layered one to fail.

3. WineSplashScreen.png - showing what a (supposedly successful) layered splash
screen looks like - captured in Ubuntu 11.04 with Wine 1.3.22.

It's pretty clear that 1 & 3 are nothing alike :)

The way I look at it, either 'UpdateLayeredWindow' needs fixing so it works how
Windows does or it needs to fail properly so the program can deal with the
failure.