How use 32bit bitmap for menus in Win32 app

Question

Hi

Platform: Win32

How set 32bit (alpha channel) bitmap for menus? When I loading the bitmap by Loadbitmap or LoadImage with LR_CREATEDIBSECTION the alpha channel in the bitmap painted as white color and it is not transparent? Is there a way to fix it? Or I have to use my old owner draw menu method!

Thanks

Answer 1

A way is with WIC

I tested the WICCreate32BitsPerPixelHBITMAP function (from MS) I had posted in this thread : https://learn.microsoft.com/en-us/answers/questions/642735/how-to-make-a-bitmap-with-alpha-using-transparentb

with a 32-bit BMP with Alpha channel in a menu item and it is transparent :

Answer 2

Problem solved by using Pre-multiplied alpha channel.