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Chapter 5. Text > Simple Fonts

5.5. Simple Fonts

There are several types of simple fonts, all of which have the following properties:

  • Glyphs in the font are selected by single-byte character codes obtained from a string that is shown by the text-showing operators. Logically, these codes index into a table of 256 glyphs; the mapping from codes to glyphs is called the font's encoding. Each font program has a built-in encoding. Under some circumstances, the encoding can be altered by means described in Section 5.5.5, “Character Encoding.”

  • Each glyph has a single set of metrics, including a horizontal displacement or width, as described in Section 5.1.3, “Glyph Positioning and Metrics;” that is, simple fonts support only horizontal writing mode.

  • Except for Type 0 fonts, Type 3 fonts in non-Tagged PDF documents, and certain standard Type 1 fonts, every font dictionary contains a subsidiary dictionary, the font descriptor, containing font-wide metrics and other attributes of the font; see Section 5.7, “Font Descriptors.” Among those attributes is an optional font file stream containing the font program.


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