How to composite argb image data on top of xrgb image data

Posted by Mr Bell on Stack Overflow See other posts from Stack Overflow or by Mr Bell
Published on 2010-06-10T21:15:46Z Indexed on 2010/06/10 21:33 UTC
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I have a pointer to an 32bit argb image's pixel data and a 32bit xrgb image's pixel data. How can I composite the argb on top of xrgb image while making use of the alpha component?

Visual Studio 2008 C++

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