Re: copy&paste from pdf bug (smallcaps, text figures)

[Philipp Gesang <Philipp.Gesang@alumni.uni-heidelberg.de>]

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···<date: 2013-08-02, Friday>···<from: Hans Hagen>···

> On 8/2/2013 2:28 PM, Philipp Gesang wrote:
> >···<date: 2013-08-02, Friday>···<from: Marco Patzer>···
> >
> >>On 2013–08–02 Philipp Gesang wrote:
> >>
> >>>     https://phi-gamma.net/pdf/copypasta.pdf
> >>>     https://phi-gamma.net/files/copypasta.txt
> >>>
> >>>I definitely get   from this
> >>>one.
> >>
> >>Indeed. When I copy from your file I get those private Unicode
> >>slots. When I run the example code from your OP, I get the correct
> >>characters. I don't know what's the difference between those two
> >>files.
> >
> >The PDF is what Context produces here with that code.
> >
> >>        The LuaTeX version and ConTeXt version is the same.
> >>
> >>Creator:        ConTeXt - 2013.08.01 01:31
> >>Producer:       LuaTeX-0.76.0
> >
> >There appears to be a difference between node and base mode
> >depending on how the font is defined:
> >
> >   \pdfcompresslevel0
> >
> >   \setupbodyfont [iwona]
> >
> >   \definefontfeature [proto]    [onum=yes,smcp=yes,script=dflt,lang=dflt]
> >   \definefontfeature [withbase] [proto] [mode=base]
> >   \definefontfeature [withnode] [proto] [mode=node]
> >
> >   \definefont [iwonab] [file:Iwona-Regular.otf*withbase]
> >   \definefont [iwonan] [file:Iwona-Regular.otf*withnode]
> >
> >   \starttext
> >     \feature[<]
> >     base mode\par
> >     {\feature[!][withbase]0123456789abcdefghijklmnopqrstuvwxyz\par}
> >     {\iwonab 0123456789abcdefghijklmnopqrstuvwxyz}
> >
> >     node mode\par
> >     {\feature[!][withnode]0123456789abcdefghijklmnopqrstuvwxyz\par}
> >     {\iwonan 0123456789abcdefghijklmnopqrstuvwxyz}
> >   \stoptext \endinput
> >
> >This gets me (through pdftotext):
> >
> >   base mode
> >   
> >   0123456789abcdefghijklmnopqrstuvwxyz
> >   node mode
> >   
> >   
> >
> >So base mode with \definefont works while node mode or the font
> >from the typescript doesn’t.
> 
> For such tests you need to compare all cases:
> 
> nopdfcompression
> 
> \setupbodyfont [iwona]
> 
> \definefontfeature [withbaseone] [proto] [mode=base]
> \definefontfeature [withnodeone] [proto] [mode=node]
> \definefontfeature [withbasetwo] [proto]
> [mode=base,onum=yes,smcp=yes,script=dflt,lang=dflt]
> \definefontfeature [withnodetwo] [proto]
> [mode=node,onum=yes,smcp=yes,script=dflt,lang=dflt]
> 
> \definefont [iwonabone] [file:Iwona-Regular.otf*withbaseone]
> \definefont [iwonanone] [file:Iwona-Regular.otf*withnodeone]
> 
> \definefont [iwonabtwo] [file:Iwona-Regular.otf*withbasetwo]
> \definefont [iwonantwo] [file:Iwona-Regular.otf*withnodetwo]
> 
> \starttext
> 
> test 1, both modes:
> 
> {\iwonanone 0123456789abcdefghijklmnopqrstuvwxyz}\par
> {\iwonabone 0123456789abcdefghijklmnopqrstuvwxyz}\par
> {\iwonantwo 0123456789abcdefghijklmnopqrstuvwxyz}\par
> {\iwonabtwo 0123456789abcdefghijklmnopqrstuvwxyz}\par
> 
> % test 2, base only:
> 
> % {\iwonabone 0123456789abcdefghijklmnopqrstuvwxyz}\par
> % {\iwonabtwo 0123456789abcdefghijklmnopqrstuvwxyz}\par
> 
> % test 3, node only:
> 
> % {\iwonanone 0123456789abcdefghijklmnopqrstuvwxyz}\par
> % {\iwonantwo 0123456789abcdefghijklmnopqrstuvwxyz}\par
> 
> \stoptext
> 
> i.e. get rid of potential interferences
> 
> attached is what i get

Your PDF is flawless, but on my machine node mode produces the
wrong output. (Also I run the luatex beta-0.76.0-2013040516 that
comes with the minimals.) PDF:

  https://phi-gamma.net/pdf/copypasta-hh.pdf

Here’s a link to the diff between your PDF and my output:

  http://pastie.org/private/zwnesrug7wpy4ket6ppl1g

This bug is quite elusive; can you think of anything that this
behavior might be a side-effect of?

Philipp


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