Re: [ft-devel] Problem with Postscript Hint
> 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). I have no idea. :-) Patches are welcome. Up to now I've never seen a real PS font which actually uses random numbers for defining its shape, so this is really a minor issue, necessary only to test the CFF `random' operator (and similar stuff in other PS flavours). BTW, if you have such a font I would be glad if you can send it to me offline for my font test collection. Werner ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
Re: [ft-devel] Problem with Postscript Hint
> I find the random generator, but it can’t explain what I’m > experiencing. Have you read this comment in the description of FT_Library For multi-threading applications each thread should have its own FT_Library object. and are you following the advice? Werner ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
Re: [ft-devel] Problem with Postscript Hint
Hi John, Thanks a lot for your answer. I find the random generator, but it can’t explain what I’m experiencing. Celine. De : freetype-devel-bounces+celine.pillet=tagginfo@nongnu.org [mailto:freetype-devel-bounces+celine.pillet=tagginfo@nongnu.org] De la part de John Tytgat Envoyé : mardi 3 mai 2011 12:35 À : freetype-devel@nongnu.org Objet : Re: [ft-devel] Problem with Postscript Hint 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. ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
Re: [ft-devel] Problem with Postscript Hint
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. ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
Re: [ft-devel] Use tt_face_get_name() in sfnt_get_ps_name()?
> If these difference is not so important, I propose to change > sfnt_get_ps_name() to thin wrapper of tt_face_get_name(). Looks good. If you don't notice adverse effects please commit. Werner ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
[ft-devel] Problem with Postscript Hint
Hello guys, 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? Regards, Céline. ___ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
