How do I draw an alpha bmp file on a big bitmap

[michaelren]

Hi,

I want to draw a symbol in a control and the control has a bitmap background.

The symbol picture that I want to draw is alpha transparent mode.

But I have no choice to deal with.

I attempted to use BitBltMasked but failed.

The BitBltMasked function is good at the mask has the same size as the bitmap.

Do you know how to do this.

Thank you!

[wizard_hu_]

What have you attempted, what have you expected, and what happened?
It is not clear from the description what the problem is with the size.