Re: wxStaticBitmap masking/color problems with comctl 6 (#16351)

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Richard Thomson

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Jul 11, 2026, 11:13:05 PM (2 days ago) Jul 11

to wx-...@googlegroups.com, wxtrac, Author

LegalizeAdulthood left a comment (wxWidgets/wxWidgets#16351)

I checked this against the current MSW implementation and it appears to have already been addressed.

The current src/msw/statbmp.cpp handles alpha bitmaps specially before passing them to the native static control with STM_SETIMAGE: it converts alpha bitmaps to a temporary non-premultiplied DIB, avoiding the double alpha premultiplication problem in the native control. Local history shows this was added by commit cc4658d1f4 ("Fix display of bitmaps with alpha in wxStaticBitmap under MSW.").

This matches the 2016 note above saying the problem was reproducible in 3.0.2 but OK in 3.1.

I also rebuilt and ran the focused current tests:

wxStaticBitmap::Set
wxStaticBitmap::ResourceLeak

Both pass on current MSW.

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