> On 26 Aug 2016, at 20:14, Nate Bellowe <nath...@windward.net> wrote: > > Hello! One quick irrelevant thing before the real post… > > The mailing list bot sent out an email that contained a broken link: > Please read > http://wiki.documentfoundation.org/Development/Use_of_MailList before posting. Changed rgds jan I.
> > On to the real email: > > Hopefully I’m not bothering you too much! Sorry to intrude on your dev > mailing list, this may seem a little off topic, but I have been banging my > head on this forever, and I know you guys are the experts! We can also all > get some help out of this, perhaps! > > I have been running into an issue that I know the developers of libreOffice > have likely faced before! I was wondering if the developers that have worked > on this before would like to talk some about this, I'd really appreciate it! > > Basically, I have some questions on how to calculate the line spacing between > lines, when parsing and rendering a docx file. > > My requirement is to exactly match Word, not necessarily the OOXML spec, in > the spacing between lines in a simple paragraph. > > In order to try to do this, I have built a tool to analyze the differences > between my layout and Word's layout. To do so it does the following: > > - First it generates a (or many) docx files. > - Next it creates pdfs from the docx files. It uses Word to render the docx > to PDF, and my program to render the docx to PDF. "word.pdf", and "me.pdf" > - Then it analyzes the resulting PDFs for differences in layout. > > So, my tool would say: > > - Create a document "template.docx" with 1000 "a" characters in a single run > of text with the same properties. > - Make a "word.pdf" and "me.pdf" from this docx > - Calculate info from the pdfs, in particular, calculating the line spacing > in terms of the calculated leading between a lines ascent and the previous > lines descent (our (Ascent + Descent) are identical-ish, so all that differs > is the whitespace between lines). I often think of it as the lines > whitespace... > > This tool showed me that the leading varies greatly from font to font. > > To depict this, I used the tool to make thousands of these comparisons, in > particular generating for: > > - For each font in system > - For "a", "y", and a mix of letters and spaces. > - For different font sizes. > - For different line spacing types (Single, One and a half, and Double) > > I was hoping to find groupings, such as "this type of font has 1.3 times my > calculation of leading". > > I was able to conclude far less than I had hoped, and was wondering if you > could help me further with the issue of calculating line spacing. I'm > providing you with a file that is best downloaded and opened using the > filters in the header row. Note that its not totally complete, there are > missing entries, but I doubt they will be a problem for anyone, and I'm going > to regenerate it soon but its pretty slow, so I'm finishing up some changes > to it first. > > Here is a comparison of the layout of our software, vs the layout of Word's > for every font installed on my system, etc. (attached and linked) > https://drive.google.com/file/d/0BzQpUdPjnJUUclRXVXFkaEh3Mms/view?usp=sharing > > I'm not positive, but I believe the issue could be one of the following: > > - Word is using a different process than we are to calculate the "leading" of > a font. We don't parse the font files ourselves, instead rely on libraries to > get font sizing information, and perhaps in the "world of font files" I am > missing something, and word is parsing the fonts directly and differently. > - Word has some sort of lookup table that handles groups of fonts, or an > algorithm, that scales a fonts leadings up or down based on some criteria I > am unaware of. > - Word is using an additional criteria besides leading, ascent, and descent, > to determine line spacing. > > Please feel free to email me at nath...@windward.net > > Thank you so much for your time!! > > I know you guys aren’t trying to emulate Word, (I very much enjoy Writer) but > am sure you’ve had complaints of people opening documents made in Word that > there friend sent them, and having major formatting differences, such as > different pagination. > > Microsoft is famous for having been both open and closed about this spec, and > thus allowing its wide-spread adoption without proper competition, and I > think that openness between communities trying to work with that is very > helpful. We’d be happy to exchange information about quirks and things that > differ from the spec that we find. > _______________________________________________ > LibreOffice mailing list > LibreOffice@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/libreoffice
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