[Bug 18314] New: The Witcher: Launcher window invisible (taskbar enty appears)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=18314

           Summary: The Witcher: Launcher window invisible (taskbar enty
                    appears)
           Product: Wine
           Version: unspecified
          Platform: Other
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdiplus
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: peppe at bsnet.se


Created an attachment (id=20857)
 --> (http://bugs.winehq.org/attachment.cgi?id=20857)
Test showing similar behaviour

Observation:
Trying to run the launcher for The Witcher (1.4) an entry appear in the taskbar
but no window appear. This is using built-in gdiplus.
Using native gdiplus the window appear.

Investigation:
Reading trace logs it becomes evident that when using wine's gdiplus the
launcher calls CreateRectRgn(0, 0, 0, 0) and then nothing more of that kind.
Ending up with a zero size window. While when using the native gdiplus there's
quite a number of CreateRectRgn and CombineRgn following.

This happens after calls to GdipBitmapLockBits and GdipBitmapUnlockBits and the
window shown when using the native gdiplus is shaped after the background
image, so I assume that the pixel data returned is used to build the shape of
the window.

Based on this assumption and the function calls seen in the traces I have build
a small test which shows the same behaviour (attached).

Looking at my test I've noticed that I get different pixel formats reported
when using native and builtin GdipCreateBitmapFromFile/GdipGetImagePixelFormat
using a RGBA png image.
Also, when requesting PixelFormat32bppARGB the pixeldata returned by
GdipBitmapLockBits have an all zero alpha channel (i.e. the whole image is
fully transparent). In my test this is the actual problem.

It is noted in a comment in the code that GdipBitmapLockBits does not fully
consider format.


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