[Bug 33084] installer of QQ2013 Beta2: has black spot in the dialog

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33084

Dmitry Timoshkov <dmitry at baikal.ru> changed:

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

--- Comment #4 from Dmitry Timoshkov <dmitry at baikal.ru> 2013-03-02 23:03:53 CST ---
(In reply to comment #3)
> Created attachment 43773 [details]
> possible fix
> 
> The attached patch seems to fix it, but I don't really understand why. It seems
> to me that a fully transparent pixel is a fully transparent pixel, and it
> shouldn't matter what's in the RGB channels. Nor does the application seem to
> do anything weird to draw it.
> 
> And I can't think of an easy way to generate a test image for this.

It shouldn't be too hard to create a sample PNG image with PLTE and tRNS
chunks, and then check the palette returned by WIC for this image.

> Dmitry, you sent a gdiplus change earlier that preserved the RGB channels when
> converting from ARGB -> RGB. Any thoughts on this?

That patch simply avoided sending PARGB to StretchBlt since only GdiAlphaBlend
understands PARGB as input, and StretchBlt just ignores alpha from ARGB passed
to it (if you mean that memcpy() patch).

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