![]() 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.
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