On 5/4/2013 10:54 PM, Werner LEMBERG wrote:
As far as I understand, both Type 1 fonts and CFF use the same or
similar rendering.
Would it be possible to use the new Adobe engine for type 1 fonts?
The are currently quite a few bugs open about the rendering quality
of type 1 fonts and I've noticed poor hinting with the ghostscript
fonts.
Indeed, this would be a good thing. Dave, can you comment on the
hinting differences between Type 1 and CFF, and whether the new CFF
code would be suitable for hinting Type 1 fonts?
Werner
It is true that Type 1 hints and CFF hints are very similar. Some of the
techniques we used in the Adobe CFF code could be applied to Type 1, but it
would be a significant effort. The structure of the charstrings are different.
For example, CFF requires all hints to be declared at the beginning of the
charstring; in Type 1 they can be declared anywhere.
The CFF code that Adobe contributed to FreeType was originally written as a
CFF-only interpreter. This contributed to keeping the code small and simple. It
is possible to combine Type 1 and CFF interpreters, but that's a non-trivial
change.
I understand the need to support legacy Type 1 fonts but I think more users
today are interested in Open Type fonts, and that calls for TrueType or CFF
outlines.
-Dave
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