hheaDescender: the depth of the descenders in units (negative value).hheaAscender: the height of the ascenders in units.You can force (or suppress) the export of a STAT table with an Export STAT table parameter in File > Font Info > Exports. By default, all variable fonts exported by Glyphs contain a STAT table, and since Glyphs 3, Use Typo Metrics is on by default for all exports. On recent Apple systems, the typo values will be preferred over the hhea values if that font both contains a STAT table and Use Typo Metrics is turned on. For convenience, I will list them here with the custom parameter names that Glyphs uses: The hhea table knows three vertical metrics values. Apple devices such as Macs, iPhones, iPads, etc., use these values for rendering. ![]() ‘hhea’ is supposed to be an abbreviation for ‘horizontal typesetting header’. ![]() The name hhea refers to the hhea OpenType table. Set the values in one master, then copy and paste the parameters into the Custom Parameters fields of all other masters.īut what do these values mean? Let me give you a quick rundown. You will do this with custom parameters in File > Font Info > Masters (Cmd-I). So, in order to avoid vertical jumps when you switch between different fonts of your family, it is a good idea to synchronize all values across all masters. You may run into problems, however, if these values change between masters. Fortunately, Glyphs does its best to calculate them based on the vertical metrics you enter for each of your masters: ascender, cap height, x-height and descender. Unfortunately, all of these values relate to each other in a pretty complicated way. Depending on which OS you’re on and which application you’re in, a different set is used for rendering the font on the screen. sTypo or OS/2) and win (or usWin) metrics. Since the problematic fonts in the PDF file are CFF, and not TrueType/ OpenType, I don't think that khaledhosny/ots#34 is even remotely relevant here.Īlso note that in createCmapTable, see fonts.js#L2833, we're not building a (0, 1) cmap either.For historical reasons, there are no less than three sets of values that deal with your vertical metrics. (Also, it's interesting to note that prior to PR #4259 those fonts didn't render even remotely correct.) Unfortunately our font code might not be as resilient to errors/weirdness in CFF files as one would like.Ī very quick look into this PDF file suggests that issue #5132 may become relevant here. Since we're generally able to parse/convert CFF data into valid OpenType fonts, I'm thinking that this may point to something being wrong with the CFF file. As the OTS errors, and #6343 (comment), shows we unfortunately don't succeed in creating a valid font. ![]() We attempt to parse and convert the CFF file into an OpenType font, which is then passed to the browser. This means that the font data is embedded as a CFF (Compact Font Format) file. The problematic fonts (in the PDF file) are of the CIDFontType0 type, with a CIDFontType0C subtype. Here is a screenshot of that text when viewing the PDF in IE 11:Īnd here is a screenshot of that text when viewing the PDF in Chrome (it looks the same in Firefox): Itatem quide id maionsequi officae sitaqui ut que dolessequis explitior rendis." The problem text in particular is in the lower left corner of the single page document, the white text on a blue background that reads: "Odiant. (The PDF loads and displays as expected when using a stand-alone PDF view, such as Adobe Acrobat Reader.) However, when I go to the same URL and open the same document using either the latest version of Chrome (v44) or Firefox (v39) the font does not appear to render and there are a number of small boxes interspersed through the text. When I go to the pdf.js web viewer online at and open this PDF using IE 11, it views fine. I have a PDF document (see ) that contains Helvetica Neu as an embedded font.
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