[cairo] how can I save the pixels of a line, and draw the line with the pixels laterly.

[M Joonas Pihlaja]

Hi,

Cairo doesn't have any special magic for copying pixels under a line, 
so you'll need to copy the pixels under the line yourself.  The 
simplest way of course is to make a copy of the destination surface 
before drawing, or you can get fancy and only copy the parts of the 
destination under the line.

Cheers,

Joonas