[Bug 38622] gdiplus should return PixelFormat32bppARGB instead of PixelFormat8bppIndexed for a grayscale PNG file

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38622

David Korth <gerbilsoft at gerbilsoft.com> changed:

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                 CC|                            |gerbilsoft at gerbilsoft.com

--- Comment #9 from David Korth <gerbilsoft at gerbilsoft.com> ---
Created attachment 55621
  --> https://bugs.winehq.org/attachment.cgi?id=55621
Sample grayscale PNG image.

I've been getting slightly different behavior on wine-1.9.16 (and wine-1.9.18).
I have a grayscale PNG image, and wine's gdiplus is actually converting it to
ARGB32, like the Windows GDI+ does; however, it's also reporting image flags of
0x13042. This indicates the image is grayscale (0x40), and it has an alpha
channel (0x02). The alpha value is bogus; on Windows XP, it returns 0x40.

I attached a sample image that I'm using in a test suite with GDI+ as a backend
on Windows.

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