How can I get transparent regions in bitmaps?

Currently, you can get the same effect with PM if you use the method used with icons:

Use a monochrome mask to prep the destination area. The mask would define which areas would be transparent and which would show the bitmap. The bits would be defined as 1=transparent,0=bitmap. You would blit the mask to the destination using ROP_SRCAND. This would blacken out the area that would display the non-transparent bits of the bitmap.

Now blit the bitmap to the destination using ROP_SRCPAINT. Note that the "transparent" areas of the bitmap must have the color black (i.e. bits=0). This ORs the bitmap onto the prep area. Viola - "transparent" bitmap.

Credit: John Webb

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