Possible bug in Mac Distiller's charpath?

On Feb 26, 7:09=A0pm, jdaw1 <jdawise...@gmail.com> wrote:
> http://pages.cs.wisc.edu/~ghost/doc....41_Interpreter
> (a history of Ghostscript versions 3.n) says at the end of the section
> entitled "30.7 Interpreter":
> 
>
> suppresses all invalidaccess checks. =A0NOT COMPLETED YET; currently
> superexec
> is equivalent to exec. =A0(zcontrol.c)
>
> Which suggests that it doesn't work in GhostScript.
>
> PS: I'm adding these links to this thread so that my code can contain
> a single reference leading to everything.
> % groups.google.com/group/comp.lang.postscript/browse_thread/thread/
> 8599a22cfa270e5f/

You know what, now it seems that superexec isn't necessary.
Maybe that restriction was removed a long time ago and I'm just
showing my age?

Note the line I have added between the 'charpath' and the 'stroke'
below:

%!PS-Bug
/FontSize 100 def
/Times-Bold FontSize selectfont

72 72 FontSize 3 mul add moveto
(0) true charpath
FontSize 2 div FontSize rlineto  FontSize 2 div FontSize neg rlineto
currentpoint moveto
(2) true charpath

mark{/moveto load}{/lineto load}{/curveto load}{/closepath load}
pathforall ] newpath cvx exec

stroke

showpage

-----------------------
One more word of warning: if Distiller attempts to do font
substitution and you get the message "Font cannot be embedded", then
it doesn't work. At least, that happened to me. When I used Times-Bold
as you did, I got the substitution message and bad outlines. When I
used TimesNewRomanPS-BoldMT (which is available on my Windows system)
then it works. Also, if it's a really unknown font name, like
CrazyTimes-Wacko, then Distiller just uses Courier and it works
(albeit with Courier outlines).


-David W.

It seems to me that the

mark{/moveto load}{/lineto load}{/curveto load}{/closepath load}
pathforall ] newpath cvx exec

just recreates the path. Please, how is that useful? (Aside: to
facilitate text editor bracket matching, I'd commence it with a "["
rather than a "mark".)

On Mar 16, 8:00=A0pm, jdaw1 <jdawise...@gmail.com> wrote:
> It seems to me that the
>
> mark{/moveto load}{/lineto load}{/curveto load}{/closepath load}
> pathforall ] newpath cvx exec
>
> just recreates the path. Please, how is that useful? (Aside: to
> facilitate text editor bracket matching, I'd commence it with a "["
> rather than a "mark".)

Well, it is useful because it fixed the bug for me (Distiller 8.1.0 on
Windows). Did you try it?
If I comment out those two lines, the path does not draw completely.

Adobe attaches a nasty attribute of some kind to the internal path
data structure if it involves a character outline. Whatever this
attribute is, it causes a bug when you try to do certain things with
the path. So by regenerating the path using only moveto, lineto,
curveto and closepath, you create a new, clean path data structure
that the interpreter thinks does not involve character outlines
(because it was not built using 'charpath'), so it does not have the
nasty attribute, so it does not have the bug when you stroke it.

-David W.

deedubman@gmail.com wrote:

>Adobe attaches a nasty attribute of some kind to the internal path
>data structure if it involves a character outline. Whatever this
>attribute is, it causes a bug ...

I think that's right. Ignoring the bug, I think it is trying to do
something desirable: to recognise sequences like

charpath fill
charpath stroke
charpath gsave fill grestore stroke

and, rather than leaving them as a collection of outlines, distilling
into filled and/or stroked references to a real font.
----------------------------------------
Aandi Inston
Please support usenet! Post replies and follow-ups, don't e-mail them.

Very logical, thank you. I will experiment.

OOI, why use

[ {/moveto load} {/lineto load} {/curveto load} {/closepath load}
pathforall ] newpath cvx exec

rather than a simpler

[ {moveto} {lineto} {curveto} {closepath} pathforall ] newpath cvx
exec

> [ {moveto} {lineto} {curveto} {closepath} pathforall ] newpath cvx
> exec

Please ignore that question: very foolish.

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