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Editorial Team
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Asked: 2026-05-25T23:46:17+00:00

I’ve got a wxWidgets program. For one piece of it, I want to use

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I’ve got a wxWidgets program. For one piece of it, I want to use an alpha channel to “fade” a set of icons if the system supports alpha-blending, and grayscale them if it doesn’t, but I can’t seem to find any way to tell whether the system supports alpha-blending or not.

Is there something I’m missing, or is there no wxWidgets and/or cross-platform way to do this?

(I’m fairly well conversant with wxWidgets, but I’ve never done alpha-blending before.)

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1 Answer

  1. Editorial Team

    From what I can tell, you call CanSetTransparent on a top-level window, and if it returns true, call SetTransparent with a value < 255. If that returns true, then the system supports alpha transparency. You must do this after the top-level window you’re working with is shown.

    (CanSetTransparent just checks the OS version under Windows, always returns true under Mac OS, and checks both the compile-time GTK version and a function on wxGTK. SetTransparent takes different paths on Windows and GTK depending on whether the value is 255 or something less.)

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