[Bug 47018] Multiple applications show transparent bitmap images on static controls with black background (comctl32 lacking support for painting 32-bit BMPv3 with alpha channel)

https://bugs.winehq.org/show_bug.cgi?id=47018

--- Comment #28 from Olivier F. R. Dierick  ---
Created attachment 64371
  --> https://bugs.winehq.org/attachment.cgi?id=64371
Patch detects non-zero alpha channel in 32-bit bitmap and use it

Hello,

Here is a patch that tries to reasonably detect when an alpha channel is used
in the bitmap and call GdiAlphaBlend() in that case.

Regards