<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252"> <meta name="Generator" content="Microsoft Exchange Server"> <style></style> </head> <body> <meta content="text/html; charset=UTF-8"> <style type="text/css" style="">  </style> <div dir="ltr"> <div id="x_divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif"> <p>Thank you very much, I appreciate this piece of information! </p> </div> <hr tabindex="-1" style="display:inline-block; width:98%"> <div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Khaled Hosny <khaledhosny@eglug.org><br> <b>Sent:</b> Saturday, August 27, 2016 12:02:22 PM<br> <b>To:</b> Nate Bellowe<br> <b>Cc:</b> libreoffice@lists.freedesktop.org<br> <b>Subject:</b> Re: Line Spacing Calculations</font> <div> </div> </div> </div> <font size="2"><span style="font-size:10pt;"> <div class="PlainText">On Fri, Aug 26, 2016 at 06:14:09PM +0000, Nate Bellowe wrote:<br> > - Word is using a different process than we are to calculate the<br> > "leading" of a font. We don't parse the font files ourselves,<br> > instead rely on libraries to get font sizing information, and<br> > perhaps in the "world of font files" I am missing something, and<br> > word is parsing the fonts directly and differently.<br> <br> I have no insight on how Word might be calculating line spacing, but<br> this would be my first guess. Fonts has 3 different set of parameters<br> that can affect line height calculations and different applications can<br> use different parameters:<br> * sTypoAscender, sTypoDescender, and sTypoLineGap, from OS/2 table[1].<br> * usWinAscent and usWinDescent, also from OS/2 table.<br> * Ascender, Ascender and LineGap from hhea table[2].<br> <br> Ideally applications should use the Typo set, falling back to the hhea<br> if OS/2 table is missing, but the reality is that many Windows<br> applications tend to abuse Win set for line spacing, and Mac<br> applications tend to prefer hhea one.<br> <br> So for realistic comparison, you need to get the values of those three<br> sets of parameters and compare Word’s line spacing to them.<br> <br> Regards,<br> Khaled<br> <br> 1. <a href="https://www.microsoft.com/typography/otspec/os2.htm">https://www.microsoft.com/typography/otspec/os2.htm</a><br> 2. <a href="https://www.microsoft.com/typography/otspec/hhea.htm">https://www.microsoft.com/typography/otspec/hhea.htm</a><br> </div> </span></font> </body> </html>