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Note: The vhea and vmtx tables that specify vertical metrics are never used by a PDF viewer application The only way to specify vertical metrics in PDF is by means of the DW2 and W2 entries in a CIDFont dictionary As discussed in Section 553, Font Subsets, an embedded font program may contain only the subset of glyphs that are used in the PDF document This may be indicated by the presence of a CharSet or CIDSet entry in the font descriptor that refers to the font le, although subset fonts are not always so identi ed
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The preceding sections describe all the facilities for showing text and causing the corresponding glyphs to be painted on the page However, a viewer application sometimes needs to determine the information content of text that is, its meaning according to some standard character identi cation, as opposed to its rendered appearance This need arises during operations such as searching, indexing, and exporting of text to other applications The Unicode standard de nes a system for numbering all of the common characters used in a large number of languages It is a suitable scheme for representing the information content of text, but not its appearance, since Unicode values identify characters, not glyphs For information about Unicode, see the Unicode Standard by the Unicode Consortium (see the Bibliography) If a font s characters are identi ed according to a standard character set that is known to the viewer application, the viewer can easily convert text to Unicode values with no additional information This character identi cation can occur if either the font uses a standard named encoding or the characters in the font are identi ed by standard character names or CIDs A viewer application can identify characters if the font with which the text is shown is de ned in any of the following ways:
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It uses one of the prede ned encodings
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MacRomanEncoding, MacExpertEncoding, WinAnsiEncoding, or any of the prede ned CMaps listed in Table 514 on page 343 except Identity H and Identity V
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It is a Type 1 font whose character names are taken from the Adobe standard
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Latin character set and the set of named characters in the Symbol font, documented in Appendix D
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It is a Type 0 font whose descendant CIDFont uses the Adobe-GB1, AdobeCNS1, Adobe-Japan1, or Adobe-Korea1 character collection (as speci ed in the CIDSystemInfo dictionary) whose supplement number is the one corresponding to the version of PDF supported by the viewer See Table 515 on page 346 for a list of the character collections corresponding to a given PDF version (Other supplements of these character collections can be used, but if the supplement is higher-numbered than the one corresponding to the supported PDF version, only the CIDs in the latter supplement are considered to be standard CIDs) If a font is not de ned in one of these ways, the viewer application has no way to identify characters in the text The glyphs can still be shown, but the characters cannot be converted to Unicode values without additional information This information can be provided as an optional ToUnicode entry (PDF 12) in the font dictionary, whose value is a stream object containing a special kind of CMap le that maps character codes to Unicode values This entry is discussed below; the overall algorithm for mapping character codes to Unicode values is described in more detail under Unicode Mapping on page 620 The CMap de ned in the ToUnicode entry must follow the syntax for CMaps introduced in Section 564, CMaps and fully documented in Adobe Technical Note #5014, Adobe CMap and CIDFont Files Speci cation Additional guidance regarding the CMap de ned in this entry is provided in Adobe Technical Note #5411, ToUnicode Mapping File Tutorial This CMap differs from an ordinary one in the following ways:
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