- Fontforge lookup subtable install#
- Fontforge lookup subtable full#
- Fontforge lookup subtable license#
It is also sensible to rename the font if you are going to distribute your adaptations - if the original author of the font has reserved the font name under the Reserved Font Name (RFN) mechanism, that original name can only be used with the original author’s version of the font.
Fontforge lookup subtable install#
If you do not rename the font, your adapted font will not install separately from the original - you will have to uninstall the original font first.
Rename the font Why should I rename the font? Save it as an sfd file, editing the suggested name to read GraphNew.sfd before saving.
Fontforge lookup subtable full#
(For a full listing of the glyphs available for Arabic script, see the Unicode charts.)ĭownload the font from the webpage and unzip it. The font we will use is Graph, and the glyph we will add is peh (U+067E), which does not occur in Arabic itself, but designates p in some languages for which Arabic script is used. This chapter walks through adding a glyph to an Arabic font.
Fontforge lookup subtable license#
If you adapt a font that was originally under an open license and then distribute it, you must retain the original author’s copyright notices and licensing information, although you can append a note at the end of the copyright notice covering your contribution. However, using the nonsense sequence dadad, the letter dal has only one shape, no matter where it occurs in the word.įonts under open licenses (e.g., GPL or OFL) allow the user to make modifications. Thus, using the nonsense sequence babab, the letter beh has three different shapes depending on whether it comes initially, medially, or finally. Arabic fonts present special issues here, because the shape of the glyph depends not only on its position in the word, but also on the attributes of the letter itself. In some cases a font may lack a glyph that is essential for its use in your application. It seems to me it would have to be the latter, else it would always be the very first record gets process and remaining records would always be ignored.Adding Glyphs to an Arabic Font Introduction But it's not completely clear whether processing of the lookup subtable stops after the first record or if all records are processed. It's clear that the records are processed in order. In particular, in contextual substitution subtables, there is an array of substitution lookup records each of which specifies a position in the input sequence and a lookup index (for the action to be applied at that position). But I can't find text in the spec that says exactly that.Īlso, I can't find text to explain what is expected if a subtable defines multiple actions that could operate on different positions in a sequence.
I have always understood this to mean that, for a given glyph-sequence position, lookup subtables are evaluated in order, and once a subtable is found to match and is processed, then processing continues at the "next" glyph position. A lookup is finished for a glyph after the client makes the substitution/positioning operation." "During text processing, a client applies a lookup to each glyph in the string before moving to the next lookup. I should know this, but I'm not finding this clearly specified in the OpenType spec.
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