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      CHAPTER 5                                                                        Text



5.5.2 TrueType Fonts

      The TrueType font format was developed by Apple Computer, Inc., and has been
      adopted as a standard font format for the Microsoft Windows operating system.
      Specifications for the TrueType font file format are available in Apple’s TrueType
      Reference Manual and Microsoft’s TrueType 1.0 Font Files Technical Specification.

      Note: A TrueType font program can be embedded directly in a PDF file as a stream
      object. The Type 42 font format that is defined for PostScript does not apply to PDF.

      A TrueType font dictionary can contain the same entries as a Type 1 font dictio-
      nary (Table 5.8 on page 413), with the following differences:

      • The value of Subtype is TrueType.
      • The value of BaseFont is derived differently, as described below.
      • The value of Encoding is subject to limitations that are described in Section
        5.5.5, “Character Encoding.”

      The PostScript name for the value of BaseFont is determined in one of two ways:

      • Use the PostScript name that is an optional entry in the “name” table of the
        TrueType font.
      • In the absence of such an entry in the “name” table, derive a PostScript name
        from the name by which the font is known in the host operating system. On a
        Windows system, the name is based on the lfFaceName field in a LOGFONT
        structure; in the Mac OS, it is based on the name of the FOND resource. If the
        name contains any spaces, the spaces are removed.

      If the font in a source document uses a bold or italic style but there is no font data
      for that style, the host operating system synthesizes the style. In this case, a com-
      ma and the style name (one of Bold, Italic, or BoldItalic) are appended to the font
      name. For example, for a TrueType font that is a bold variant of the New York
      font, the BaseFont value is written as /NewYork , Bold (as illustrated in Example
      5.8).

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