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Text
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ventions for referring to external font programs; however, some details of font naming, font substitution, and glyph selection are implementation-dependent and may vary among different viewer applications and operating system environments
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55 Simple Fonts
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There are several types of simple font, all of which have the following properties:
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Glyphs in the font are selected by single-byte character codes obtained from a
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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 555, Character Encoding
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Each glyph has a single set of metrics, including a horizontal displacement or
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width, as described in Section 513, Glyph Positioning and Metrics That is, simple fonts support only horizontal writing mode
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Except for Type 3 fonts and certain standard Type 1 fonts, every font dictionary
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contains a subsidiary dictionary, the font descriptor, containing fontwide metrics and other attributes of the font; see Section 57, Font Descriptors Among those attributes is an optional font le stream containing the font program itself
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551 Type 1 Fonts
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A Type 1 font program is a stylized PostScript program that describes glyph shapes It uses a compact encoding for the glyph descriptions, and it includes hint information that enables high-quality rendering even at small sizes and low resolutions Details on this format are provided in a separate book, Adobe Type 1 Font Format An alternative, more compact but functionally equivalent representation of a Type 1 font program is documented in Adobe Technical Note #5176, The Compact Font Format Speci cation Note: Although a Type 1 font program uses PostScript language syntax, using it does not require a full PostScript interpreter; a specialized Type 1 font interpreter suf ces
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Simple Fonts
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A Type 1 font dictionary contains the entries listed in Table 58 Some entries are optional for the standard 14 fonts listed under Standard Type 1 Fonts on page 319, but are required otherwise
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TABLE 58 Entries in a Type 1 font dictionary
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KEY TYPE VALUE
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Type Subtype Name
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name name name
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(Required) The type of PDF object that this dictionary describes; must be
Font for a font dictionary
(Required) The type of font; must be Type1 for a Type 1 font (Required in PDF 10; optional otherwise) The name by which this font is referenced in the Font subdictionary of the current resource dictionary Note: This entry is obsolescent and its use is no longer recommended (See implementation note 42 in Appendix H)
BaseFont
name
(Required) The PostScript name of the font For Type 1 fonts, this is usually the value of the FontName entry in the font program; for more information, see Section 52 of the PostScript Language Reference, Third Edition The PostScript name of the font can be used to nd the font s de nition in the viewer application or its environment It is also the name that will be used when printing to a PostScript output device (Required except for the standard 14 fonts) The rst character code de ned in the font s Widths array (Required except for the standard 14 fonts) The last character code de ned in the font s Widths array (Required except for the standard 14 fonts; indirect reference preferred) An array of (LastChar FirstChar + 1) widths, each element being the glyph width for the character whose code is FirstChar plus the array index For character codes outside the range FirstChar to LastChar, the value of MissingWidth from the FontDescriptor entry for this font is used The glyph widths are measured in units in which 1000 units corresponds to 1 unit in text space These widths must be consistent with the actual widths given in the font program itself (See implementation note 43 in Appendix H) For more information on glyph widths and other glyph metrics, see Section 513, Glyph Positioning and Metrics (Required except for the standard 14 fonts; must be an indirect reference) A font descriptor describing the font s metrics other than its glyph widths (see Section 57, Font Descriptors )