Thank you, Caolán, for your suggestions.
The first thing I've tried was to compile the current version with and without harfbuzz using ./autogen.sh --with-harfbuzz=no The result was the same (bad). I am, however, not sure if harfbuzz was really switched off, since in config.log I can see $ ./configure --with-harfbuzz=no --srcdir=/mnt/data/milos/sbox/libreoffice.git --enable-option-checking=fatal but later configure:30367: checking which harfbuzz to use configure:30468: result: internal and later also -I/usr/include/harfbuzz -lharfbuzz -lharfbuzz-icu I've tried to investigate it bit deeper: revision mentioned: bff8fa9 - (2013-05-06 11:08:29 +0200) Enable HarfBuzz by default - Khaled Hosny The last good revision according to my bibisection f0393d7 - (2013-05-06 16:54:53 +0200) [harfbuzz] Fix text width calculation, 3rd try - Khaled Hosny The first bad revision according to my bibisection 48ad2f6 - (2013-05-06 12:48:23 +0200) fdo#46808, Convert some code to getProcessComponentContext So, they really are from the same day. I unfortunately cannot compile these revisions, maybe because my compiter is too new (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1)). I happens because of std::auto_ptr: /workdir/unxlngx6.pro/UnpackedTarball/boost/boost/smart_ptr/scoped_ptr.hpp:66:31: warning: ‘template<class> class std::auto_ptr’ is deprecated [-Wdeprecated-declarations] How should I use the -Wdeprecated-declarations switch? thanks Milos On 2016-07-20 18:27, Caolán McNamara wrote: > On Wed, 2016-07-20 at 08:55 +0200, Milos Sramek wrote: >> Hi, >> >> In Brno I would like to present my tools for automated detection and >> bibisection of interoperability problems between LO an MS Office. My >> method is currently of limited utility, because there is a problem >> with >> rendering of plain text, which affects most documents and overshadows >> other bugs. >> >> I managed to localized the problem by bibisection. I also wanted to >> investigate it more deeply, but was unable to compile that version. >> Thus, I would need help from you :). >> >> The problem resides in that the text layout changed (as bibisected >> using bibisect-43all): > You don't state the platform you were working on. Was it Linux, if so > then probably "bff8fa97e16f0f06fddc5545ea36c8bd2b18a580: Enable > HarfBuzz by default" is what changed during that period. > > With text layout there's the vcl level stuff, which is now backed by > harfbuzz on Linux, and different things on the other platforms. > Typically we have had "little" differences between out platforms when > it comes to text layout already. There's a GSOC underway to experiment > with using harfbuzz on all platforms. In this stack of code different > features enabled/disabled in the underlying fontconfig can cause other > differences too. > > I presume you've ensured the same fonts are available to LibreOffice as > MSOffice otherwise you'd not have gotten this far anyway I guess. > > There's also some extra "wiggling" of glyphs that writer does on top of > all this. I never could quite figure out what writer does there or why > it does it, but that adds some extra variability to things. > > I could never get an exact pixel-to-pixel match in the past (ages ago, > before the harfbuzz rework) so I guess this was also a "slightly-fuzzy" > approach in the close-match case. > > Maybe there's some way to try disabling kerning in the harfbuzz layer > to see if that makes a difference in any way. > > C. > > as an aside, if I was going down the road again of investigating our > differences in layout vs msoffice I'd probably try getting harfbuzz up > and running under windows LibreOffice and then see what the differences > there were between LibreOffice/MSOffice after throwing out all the > mysterious writer adjustment code. Possibly creating some ultra-dumb > font that is plain black blocks or something like that. > _______________________________________________ > LibreOffice mailing list > LibreOffice@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/libreoffice -- email & jabber: sramek.mi...@gmail.com _______________________________________________ LibreOffice mailing list LibreOffice@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/libreoffice
