How can I use a PathGeometry as a mask for a BitmapSource (or any image data)?

Posted by Jedidja on Stack Overflow See other posts from Stack Overflow or by Jedidja
Published on 2010-04-09T19:01:25Z Indexed on 2010/04/10 21:33 UTC
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wpf

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c#

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mask

Assuming I have a BitmapSource (actually I have access to the raw pixels as well if necessary), how can I use a PathGeometry as a mask to cut out certain parts of the image?

   01234567890123456789
 0 --------------------
 1 |   +     +        |
 2 |      *           |
 3 |          *    )  |
 4 |    *             |
 5 |            (     |
 6 --------------------

Assuming I have a PathGeometry that describes a rectangle that goes from (0, 0) to (8, 3), I would like to be able to get one of the following two images:

   01234567890123456789
 0 --------------------
 1 |   +              |
 2 |      *           |
 3 |                  |
 4 |                  |
 5 |                  |
 6 --------------------

or

   012345678
 0 ---------
 1 |   +   |
 2 |      *|
 3 ---------

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