get-bitmap-mask in image-snip%

Returns the mask bitmap that is used for displaying by the snip, if one was installed with set-bitmap. If no mask is used, the result is #f.

The returned bitmap cannot be selected into a bitmap-dc% as long as it belongs to the snip, but it can be used as a pen or brush stipple.

• (send an-image-snip get-bitmap-mask) -> bitmap% object or #f