[NTG-pdftex] [ pdftex-Bugs-712 ] problems with \letterspacefont

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Thu Feb 1 20:02:17 CET 2007


Bugs item #712, was opened at 2006-12-12 02:53
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Category: hz
Group: v1.40.0
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: Robert (schlcht)
Assigned to: The Thanh Han (hanthethanh)
Summary: problems with \letterspacefont

Initial Comment:
% Testing the new \letterspacefont, I found:
%
% (1) it's certainly not correct to have the spacing 
%     relative to character widths (look at `minimal'!)
% (2) everything's shifted to the right
% (3) when trying to expand the letter-spaced font, I 
%     get the warning `font should be expanded before 
%     its first use' (even before its first use), and 
%     then pdftex segfaults.

\pdfadjustspacing2
\hsize13cm
This is normal text This is normal text 
This is normal text This is normal text 
This is normal text This is normal text
{\letterspacefont\lspfont=\font 1000
%\pdffontexpand\lspfont 20 20 5 autoexpand % segfault
\lspfont
This isn't normal text This isn't normal text
This isn't normal text This is minimal text}
This is normal text This is normal text 
This is normal text
\bye





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>Comment By: Robert (schlcht)
Date: 2007-02-01 19:02

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If the warning is misleading, should it not be removed?

On a different matter: Since \letterspacefont issues
set_no_ligatures, there won't be any kerning, either.
There's no way around that, I guess?

(I hope luatex will abolish with this nonsensical connexion
of ligatures and kerns?)


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Comment By: The Thanh Han (hanthethanh)
Date: 2007-01-04 15:59

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The warning is misleading but harmless. The reason of the
warning is that pdftex checks whether a font has not been
used before expansion (its type has not been examined and is
new/unknown yet). \letterspacefont sets the type of \y as a
virtual font, thus pdftex thinks the font might have been
used before. 

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Comment By: Robert (schlcht)
Date: 2007-01-04 00:40

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I'm a bit confused about the status of (3): letterspacing
and expansion:
When expanding a letterspaced font, pdftex issues the
warning: ``font should be expanded before its first use'',
but apart from that, I cannot see any problems -- the font
is both letterspaced and expanded. 
Or is there a reason for the warning?

\pdfadjustspacing2
\font\x=cmr10 \x
\letterspacefont\y=\x 100 \y
\pdffontexpand\y 20 20 5 autoexpand
...
\bye


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Comment By: Martin Schröder (oneiros)
Date: 2006-12-21 16:09

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A patch for this will be included in the next version (1.40).

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Comment By: The Thanh Han (hanthethanh)
Date: 2006-12-12 17:47

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oops, I disabled ligature for letter-spaced font, but this
should not affect the base font. Will have to rethink. Most
likely the syntax will change like follows:

\letterspacefont\f=cmr10 at 11pt 100
\f text




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Comment By: Robert (schlcht)
Date: 2006-12-12 15:50

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% and here's
% (4) ligatures will be broken up, not only in the 
%     letter-spaced font (which is probably acceptable), 
%     but in all subsequent uses of the base font, too

fi\par
{\letterspacefont\lspfont=\font 100 \lspfont fi}\par
fi

\bye



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Comment By: The Thanh Han (hanthethanh)
Date: 2006-12-12 13:31

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I fixed (1) and (2); (3) is disabled now, ie you cannot
expand a letter-spaced font. Please wait for another release
from Martin.

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