Hi Werner, Okay, so in my specific case (CFF) the value is not used.
I have been busy with other things, and was about to start making the change in the FreeType code that we talked about. But it's a little demotivating that the (required!) value is not used anyway... Thanks a lot for forwarding the Adobe communication though. Regards, Michael On 01/06/2013, at 14.48, Werner LEMBERG wrote: > >> BTW, I've already received a `This is a good question' answer from >> Adobe, waiting for more to come :-) > > And here it is. The answer is far from trivial... > > Dave Arnold says that there are two cases where the StemV value is > used (he wrote that from memory): > > . to select a font weight if a font substitution happens > > . to guide stem darkening for embedded TrueType fonts. > > Note that Adobe uses a special, self-made version of the TT > interpreter which both handles stem darkening and artificial > emboldening *before* hinting takes place. > > The StemV value is *not* used by the PDF engine if the embedded font > is either a Type 1 or CFF font; in that case the value from the > private dictionary gets used. For a CID font, the value associated > with the glyph's font DICT gets used. > > In case there is no StemV value in the PDF, the following algorithm > applies: > > . use a heuristic method to measure a particular glyph outline for > getting a proper value > > . if that fails, use a default value (Dave believes it's 75 units) > > Similarly, this default value is used for CFFs which miss a StdVW > operator. > > > Werner _______________________________________________ Freetype-devel mailing list Freetype-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/freetype-devel
