![]() So, we have two sets of numbers: a universal standard for the world of Unicode characters (code points) and another arbitrary set of numbers (specific to each font) for the internal world of OpenType glyphs: the Glyph ID. The point is that the Glyph ID has nothing to do with the Unicode encoding or code points: it’s just an internal bookeeping number used internally within the font. The Glyph ID is simply a number allocated to each glyph (e.g., by the font’s creator) ranging from 0 to N-1 where N is the number of glyphs contained in the particular font. However, for now just think of an OpenType font as containing a set of glyphs where each glyph has a name and a numeric identifier called its Glyph ID. OpenType fonts can provide extensive support for high quality typesetting via “features” and “lookups” which provide information that a typesetting or rendering engine can use to do its job (think of them as a set of “rules” for the typesetting/rendering engine to apply). Of course, OpenType fonts can provide a lot more than just the glyphs themselves. The two key points to understand are:įor present purposes we can take the very simplistic view that an OpenType font is a container for a large collection of glyphs in the form of the lines and curves required to draw (render) them. However, as you start to explore OpenType in more detail you start to see references to terms such as “Glyph ID” or “Glyph index” and may wonder how, or if, these relate to the Unicode character encoding (code points). Today, OpenType font technology is the dominant font standard and is supported by modern TeX engines such as LuaTeX and XeTeX. Unicode does not concern itself with the visual representation of those characters that is the job for fonts: they provide glyphs. Among the many things that the Unicode standard provides is a univeral encoding of the world’s character set: in essence, allocating a unique number to the characters covered by the standard. In contrast to characters, glyphs appear on the screen or paper as particular representations of one or more characters. Glyphs represent the shapes that characters can have when they are rendered or displayed.They represent primarily, but not exclusively, the letters, punctuation, and other signs that constitute natural language text and technical notation. Characters are the abstract representations of the smallest components of written language that have semantic value.I’ve discussed this in a previous post but will summarise here (quoting from the Unicode standard): ![]() Just as a reminder, one extremely important concept to understand/appreciate is the difference between characters and glyphs. And this can be a bit puzzling: what’s the relationship between them? In this post I’ll try to give a brief introduction with the usual notice that I’m skipping vast amounts of detail in the interests of simplicity. I upgraded another CM font for someone here in the forum, and when I was done I sent the source files, and the upgraded font to the original author.As you read about OpenType fonts and Unicode you come across terms such as “Glyph IDs”, Unicode characters/code points and suchlike. May not be perfect, but better than nothing. It is pretty much push-da-button if the parts are all there. "hey, we got some accents, we got some old marks, look, we can make a bunch of characters with these!" It may be fairly easy to generate the accented characters.Īpplications like FontLab or Glyphs App can take the parts and magically make the accented characters. I have not been able to find your particular Cupcake font (found 3 different ones). So this requires the non-spacing marks, and the anchors. They have no width, and are entered after the base character, and they are aligned using invisible anchors. In Unicode the modern accents, or marks, are all now "combining" accents. This required some keyboard specifics, and the old "codepage" encoding.Īffinity applications do not support the old codepage encoding. The old legacy accents from the old pre-Unicode fonts were entered by first entering the accent, and then the base character. Now that I have done a better job of reading what you wrote, and what others wrote about the font not having the accented characters.
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