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This function flips the image horizontally or vertically or
both. Flipping both horizontally and vertically is equivalent to a
180 degree rotation.
An image may have an associated bit mask or soft (alpha) mask.
If this is the case the associated mask will be transformed as
well.
Flipping horizontally will mean that pixels that were on the far
right of the image will be moved to the far left and pixels on the
left will be moved to the right.
Flipping horizontally will mean that pixels that were on the top
of the image will be moved to the bottom and pixels that were on
the bottom will be moved to the top.
After the Bitmap has been set the PixMap will be uncompressed.
You may wish to compress it using a call like CompressJpeg or CompressFlate.
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