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dvips: Reencoding with Afm2tfm

 
 6.3.1.4 Reencoding with Afm2tfm
 ...............................
 
 The Afm2tfm program creates the TFM and VF files for the virtual font
 corresponding to a PostScript font by "reencoding" the PostScript font.
 Afm2tfm generates these files from two encodings: one for TeX and one
 for PostScript.  The TeX encoding is used to map character numbers to
 character names while the PostScript encoding is used to map each
 character name to a possibly different number.  In combination, you can
 get access to any character of a PostScript font at any position for TeX
 typesetting.
 
    In the default case, when you specify none of the '-t', '-p', or '-T'
 options, Afm2tfm uses a default TeX encoding (which mostly corresponds
 to the Computer Modern text fonts) and the PostScript encoding found in
 the AFM file being read.  The reencoding is also sometimes called a
 "remapping".
 
    For example, the default encodings reencode the acute accent in two
 steps: first the default TeX encoding maps the number 19 to the
 character name 'acute'; then the default PostScript encoding, as found
 in the AFM file for an ordinary PostScript font, maps the character name
 'acute' to the number 194.  (The PostScript encoding works in reverse,
 by looking in the encoding vector for the name and then yielding the
 corresponding number.)  The combined mapping of 19 to 194 shows up
 explicitly in the VF file and also implicitly in the fact that the
 properties of PostScript character 194 appear in position 19 of the TFM
 file for the virtual font.
 
    The default encoding of the distributed fonts (e.g., 'ptmr.tfm')
 mostly follows plain TeX conventions for accents.  The exceptions: the
 Hungarian umlaut (which is at position '0x7D' in 'cmr10', but position
 '0xCD' in 'ptmr'); the dot accent (at positions '0x5F' and '0xC7',
 respectively); and the Scandinavian A ring '\AA', whose definition needs
 different tweaking.  In order to use these accents with PostScript fonts
 or in math mode when '\textfont0' is a PostScript font, you will need to
 use the following definitions.  These definitions will not work with the
 Computer Modern fonts for the relevant accents.  They are already part
 of the distributed 'psfonts.sty' for use with LaTeX.
 
      \def\H#1{{\accent"CD #1}}
      \def\.#1{{\accent"C7 #1}}
      \def\dot{\mathaccent"70C7 }
      \newdimen\aadimen
      \def\AA{\leavevmode\setbox0\hbox{h}\aadimen\ht0
        \advance\aadimen-1ex\setbox0\hbox{A}\rlap{\raise.67\aadimen
        \hbox to \wd0{\hss\char'27\hss}}A}
 
    As a kind of summary, here are the 'CODINGSCHEME's that result from
 the various possible choices for reencoding.
 
 default encoding
           (CODINGSCHEME TeX text + AdobeStandardEncoding)
 
 '-p dc.enc'
           (CODINGSCHEME TeX text + DCEncoding)
 
 '-t dc.enc'
           (CODINGSCHEME DCEncoding + AdobeStandardEncoding)
 
 '-T dc.enc'
           (CODINGSCHEME DCEncoding + DCEncoding)
 
 The 'CODINGSCHEME' line appears in the VPL file but is ignored by Dvips.
 

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