On 16/03/2011 09:33, Werner LEMBERG wrote:
I have discovered some other minor optimisations to the stroker
module, but I'm not sure if it's worth mentioning them - they won't
provide much speed improvement but will get rid of some anomalies
and inefficiencies.
*Any* improvement is highly welcomed! I'm glad that you are actually
looking at the code.
Werner
I have also discovered that CartoType's method of stroking paths is much
faster than FreeType's (more than twice as fast, I think - at any rate,
it makes CartoType benchmark at about 10 seconds as opposed to 15
seconds, and CartoType does a lot of other things; this was
disappointing to me because I had hoped to speed up CartoType by using
the FreeType method). I don't have time to create a FreeType version of
the CartoType system right now, but I think it's because CartoType uses
the intersections of parallels to get inner join positions, while
FreeType calculates them using trigonometry.
I'm happy to share CartoType's system with the world if it's of interest
- but again, it's a matter of time, because I am very busy and
CartoType's C++ coding style is very different from FreeType's C, so I'd
have to do a lot of conversion.
Credit for CartoType's system is due to my colleague Lex Warners (now
inactive, alas), who also implemented the fixed-point trigonometric
routines.
Graham
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