I attached a picture which explains what I'm trying to accomplish. The pink part is part of the image loaded using bitblt API, the blue part is the background of the form. What I want to do is make the pink area invisible, so the form would show thru. I remember there was something with mask related to bitblt, but I don't really understand where to go from here and which constant to use to mask the pink area as invisible. Every pink pixel should be invisible. Thanks.
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