[cairo] copy cairo surface content to a bitmap cont'd..

[Jonathan Morton]

> While this memcpy succeeds, the bitmap is upside down and back to
> front.

Assuming that only the Y axis is inverted, you could use one memcpy()
per line to do an inverted copy.  Simply copy the first line into the
space reserved for the last one, and so forth.  That's fairly cheap, if
you're copying already.

Watch out for off-by-one errors though.

-- 
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From: Jonathan Morton
      jonathan.morton at movial.com