On 5/3/2011 9:52 AM, PILLET Céline wrote:
I have a problem with hints of PostScript fonts.
I create 2 consecutives bitmap with a postscript font, with a
multithread program, and rendering differs slightly.
I don’t have this problem when I create bitmap without “hints”.
I don’t have this problem when I create bitmap with “hints”, in a
single thread program.
Do you have an idea of something that is not thread safe in the
PostScript hints code?
If you mean 'PostScript font' = Type 1, CID or CFF font', search for
'seed' used for implementing a random generator. This is calculated
based on location of stack variable. This *could* explain what you're
experiencing but I'm not sure.
Question for the FT developers : why was this seed calculation
implemented this way ? And not e.g. a fixed start value associated with
each FT_Face created ? That would make FT output reproducable (and
testable for detecting regressions).
John.
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