Picture for Window Background

umm... this might be a kinda hard question, I dunno.

I have a picture right?

Code:

---

HBITMAP                hBitmapBackground;
HBRUSH                hBrush;

hBitmapBackground = LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_MAIN));
hBrush = CreatePatternBrush(hBitmapBackground);
DeleteObject(hBitmapBackground);

---

And I'm about to set it to the background for my Window, but...
The picture isn't square. It's circular. How can I make it so, that everything in the picture that is the colour white, goes invisible??

So it reads each pixel in the picture, and if the pixel is white, then it just makes it invisible??

The only way I can think of is making a round rectangle region of the whole window and then put the bitmap on it.

You should have some kind of colour. You cannot just make the pixel invisible(think so)

But I'm gunna wanna make a function and use it for buttons and that 2. I know it's possible. I've seen it done. Any1 know how??

Check this out.... it might help

http://www.winprog.org/tutorial-old/#2.5.

how about after bitblt the image into the window, the call another 2 API CreateEllipticRgn and SetWindowRgn to make the window become circle.

will this help?
:)

I dont think he wants a circle window... He wants to use a mask to make the color around the circle transparent

I could be wrong though