[Devel] Re: Distiller produced PFA problems

[Tom Kacvinsky]

I suspect this might have to do with the fact that the FontBBox in the font you
sent me is {0 0 0 0}.  Does this over magnification happen if the FontBBox is
non-zero (by zero bbox, I mean all entries are zero.  a non-zero bbox then means
that not all entries are zero.  this is the mathematician in me speaking. :)

Tom

On Tue, 23 Jan 2001, Blinn, Eric W wrote:

>
> Hi Tom,
>
> Thanks.  With your patch we are almost there with Distiller produced PFAs,
> but there is still one problem.  We now have glyphs and metrics to work with
> and they look good, but the glyphs themselves need to be scaled down by 50%.
>
> I have a local fix... okay hack really, where I'm keying off some of the
> missing FontInfo data to detect that we are dealing with a Distiller
> produced PFA and then scaling the font matrix xx and yy values back by half.
> Not a fix I'll want to stick with mind you, just "proof of concept" in the
> course of troubleshooting.  I'll leave it to you and the other FreeType
> gurus to determine how and where to handle this in the library.
>
> Thanks,
> Eric
>
>
> > -----Original Message-----
> > From: Tom Kacvinsky [mailto:address@hidden
> > Sent: Monday, January 22, 2001 11:34 PM
> > To: address@hidden
> > Subject: [Devel] Re: Distiller produced PFA problems
> >
> >
> > Well, here is the patch.  I have yet to add dummy FontInfo support (I
> > am still thinking about how best to approach it).  I send this patch
> > along for review before I commit it.  The thing to note is that the
> > test I removed prevented one from parsing the dictionaries if the
> > FontInfo keyword was never seen.  Now that test is gone, and things
> > work fine.  I tested with both MM and regular Type 1 fonts, and had no
> > problems.
> >
> > Oh yeah, I rechecked my Type 1 notes: it is OtherSubrs that can be
> > missing from the font, and ATM and its ilk is *supposed* to provide
> > defaults.  If any given char string uses a subroutine, all subroutines
> > must be present (whereas I had previously thought that subrs 0 - 3
> > could be missing).  What I will do is add code that will return an
> > error if the font uses subroutines and the Subrs array is missing.
> > This, I think, is supposed to go into t1decode.c (part of the psaux
> > module).
> >
> > Tom
> >
> > On Mon, 22 Jan 2001, Tom Kacvinsky wrote:
> >
> > > Hi,
> > >
> > > I will get the patch out tonight.  I know what to change, I
> > just need to make
> > > sure that there aren't any ill side affects.
> > >
> > > Tom
> > >
> > > On Mon, 22 Jan 2001, Blinn, Eric W wrote:
> > >
> > > >
> > > > Tom Kacvinsky wrote:
> > > > >
> > > > > I found the problem, finally.  There is bug in FreeType that
> > > > > reports there is no CharStrings dictionary when there is one.
> > > > > Adding a FontInfo dictionary causes the false report to go
> > > > > away.  I'll see what I can come up with.
> > > >
> > > > Thanks for all the effort Tom.  Since you've found the problem
> > > > this information probably has little value, but you had asked
> > > > in another message about whether I had added a dummy FontInfo
> > > > dictionary when testing your fix on my platforms.  I had not,
> > > > but the analysis you gave pretty well explains how the dummy
> > > > FontInfo data was masking the CharStrings dictionary bug at
> > > > your end.
> > > >
> > > >
> > > > > Eric, I hope this isn't causing you too much stress, what
> > > > > with the 11th hour show stopper you were referring to...
> > > >
> > > > Well, maybe only a couple days of stress!  :-)
> > > > It looked like it could hold up our release, but since then
> > > > we have done a risk analysis.  With the data we're handling,
> > > > we don't think it will be a problem in the immediate future
> > > > but it could be (likely will be) down the road.  Now that
> > > > you have a handle on the problem, I'll just roll whatever
> > > > fix you settle on into our next release (or perhaps even this
> > > > one if circumstances permit).
> > > >
> > >
> > >
> > > _______________________________________________
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> > >
> >
>
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