Re: #9371: Math Preview doesn’t work in LuaTeX and XeTeX output modes by default

[Kornel Benko]

Am Montag, 27. April 2015 um 18:48:46, schrieb Enrico Forestieri 
<for...@lyx.org>
> On Mon, Apr 27, 2015 at 06:06:48PM +0200, Kornel Benko wrote:
> > Am Montag, 27. April 2015 um 17:38:43, schrieb Enrico Forestieri 
> > <for...@lyx.org>
> > > 
> > > What about speed of conversion and image quality?
> > > Make sure you have pdftocairo and epstopdf.
> > > 
> > 
> > I had both already installed.
> > pdftocairo in package poppler-utils, epstopdf as part of TL2014.
> > 
> > I did'nt notice problems with image quality or speed. Probably not enough 
> > preview
> > images. Or bad eyes.
> 
> I attach here a document with a preview and what I obtain with ghostscript
> and pdftocairo. I think the results from the latter are much better.
> As regards speed, yes, only if you have a document with some hundreds of
> equations it becomes noticeable.
> 

Now I see what you meant. Yes, the second (pdftocairo) is far better.

This file is also a good check for lyx2lyx. I can open it with lyx2.0, but 
neither
with lyx2.1 nor with lyx2.2.

(2.2 version)
# lyx2lyx piano-inclinato.lyx

Traceback (most recent call last):
  File "/usr/local/lyx2.2/lyx2lyx/lyx2lyx", line 86, in <module>
    main()
  File "/usr/local/lyx2.2/lyx2lyx/lyx2lyx", line 79, in main
    doc = LyX.File(**options.__dict__)
  File "/usr9/local/lyx2.2/lyx2lyx/LyX.py", line 734, in __init__
    self.read()
  File "/usr9/local/lyx2.2/lyx2lyx/LyX.py", line 347, in read
    line = self.input.readline().decode(self.encoding)
  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe8 in position 30: invalid 
continuation byte

-----------------------------
# python3 /usr/local/lyx2.2/lyx2lyx/lyx2lyx piano-inclinato.lyx
Traceback (most recent call last):
  File "/usr/local/lyx2.2/lyx2lyx/lyx2lyx", line 86, in <module>
    main()
  File "/usr/local/lyx2.2/lyx2lyx/lyx2lyx", line 79, in main
    doc = LyX.File(**options.__dict__)
  File "/usr9/local/lyx2.2/lyx2lyx/LyX.py", line 734, in __init__
    self.read()
  File "/usr9/local/lyx2.2/lyx2lyx/LyX.py", line 280, in read
    line = self.input.readline()
  File "/usr/lib/python3.4/codecs.py", line 313, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe8 in position 5502: 
invalid continuation byte

--> Same error.

I had to convert 'è' (2 occurrences) to some other string first (inside the 
tikzpicture)

        Kornel

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