[cairo] Negative clipping: solution for even-numbered overlaps of clipping regions?
chris at chris-wilson.co.uk
Wed May 27 12:32:11 PDT 2009
On Wed, 2009-05-27 at 15:09 -0400, Behdad Esfahbod wrote:
> On 05/27/2009 10:18 AM, Benjamin Redelings I wrote:
> > So ... Can anyone recommend another way of doing negative clipping? :-)
> This is unfortunately a limitation of cairo currently. I can't think of any
> workarounds right now.
When in doubt, construct the mask yourself...
Something along the lines of:
set_source_rgba (0, 0, 0, 1)
draw thin lines
set_source_rgba (0, 0, 0, 0) [or set_operator(CLEAR)]
draw obscuring fat lines
pattern = pop_group ()
This may even be similar in speed to performing geometry clipping. ;-)
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