Making Bitmap Backgrounds Transparent in Windows CE Applications

By Nancy Nicolaisen Sometimes, it's useful to be able to display the foreground layer of a bitmap by itself. In the following figure, notice how the rooster, penguin, and cockatoo appear to be drawn on the background of the viewport. In fact, each of these images is a rectangular bitmap. The entire bitmap is painted in the client area, but the background pixels of the bitmap are combined with the client area pixels "transparently." Essentially, this makes the bitmap behave like a slide...n

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