[Bug 50454] New: Icons have non-transparent background in HxD

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50454

            Bug ID: 50454
           Summary: Icons have non-transparent background in HxD
           Product: Wine
           Version: 6.0-rc5
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: comctl32
          Assignee: wine-bugs at winehq.org
          Reporter: gabrielopcode at gmail.com
      Distribution: ---

Created attachment 69068
  --> https://bugs.winehq.org/attachment.cgi?id=69068
Icons with pink background

Since 61b9209221d28d5d02379791ac1316c1fc2ca3b7, adding 32bpp images to an image
list doesn't mask out the background via mask anymore, even though the mask is
processed properly. Icons in HxD, for example, have pink background instead of
transparent. (see attachment)

Prior to that patch, the alpha itself was modified for the background, which
was also wrong as tests show. I've sent a patch to wine-devel that masks out
the background while preserving the alpha channel.

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