[Bug 39774] Desktop "Holiday Lights" app doesn't show lights on OS X

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39774

Ken Thomases <ken at codeweavers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #3 from Ken Thomases <ken at codeweavers.com> ---
Unfortunately, there's not going to be any quick fix for this.  It may never be
fixed.

The program draws directly to the desktop window.  That's not currently
supported on the Mac, either with the Mac driver or X11 driver (except with
virtual desktop mode, where Wine's desktop is different from the Mac desktop).

It's not clear exactly how I _could_ support it.  Mac apps are not allowed to
draw directly to the desktop.  I could perhaps fake it with a transparent
overlay window, but it's not obvious how to know what parts of the window
should be transparent.

I could maybe use some color-keying approach.  I think the app reads the
current bitmap of the desktop, draws on top of that, and then blits that
modified bitmap to the desktop.  If I made the read operation produce some
bogus solid color (e.g. magenta) and then treated any pixels that remain
magenta after the app draws to it as transparent, that might work.  On the
other hand, this app seems like one that might actually use magenta in its
drawing.  Also that approach would conflict with apps which read the desktop
and expect to get its actual contents (like a screenshot feature), should I
ever actually implement support for that in the Mac driver.

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