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87 lines
3.1 KiB
87 lines
3.1 KiB
// -*- C++ -*-
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// fontEncoding.h
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//
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// Part of KDVI - A DVI previewer for the KDE desktop environemt
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//
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// (C) 2003 Stefan Kebekus
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// Distributed under the GPL
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#ifndef _FONTENCODING_H
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#define _FONTENCODING_H
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#include <tqstring.h>
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/**
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* This class represents the contents of a font encoding file,
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* e.g. "8r.enc"
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*
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* Explanation of font encodings: TeX was designed to only use
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* MetaFont fonts. A DVI file referres to a MetaFont font by giving an
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* at-most-8-character name, such as 'cmr10'. The DVI previewer would
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* then locate the associated PK font file (e.g. cmr10.600pk), load
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* it, and retrieve the character tqshaped.
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*
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* Today TeX is also used to access Type1 and TrueType fonts, which it
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* was never designed to do. As in the case of MetaFont font, the DVI
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* file specifies the name of a font, e.g. 'rpbkd', and the DVI
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* previewer finds the associated font file 'ubkd8a.pfb' by means of a
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* map file (see fontMap.h). The font map file also specifies an
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* encoding (e.g. '8r', to be found in a file '8r.enc'). Font
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* encodings are necessary because TeX can only use the first 256
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* characters of a font, while modern PostScript fonts often contain
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* more.
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*
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* In a PostScript font, glyphs can often be accessed in two ways:
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*
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* (a) by an integer, the 'glyph index', which need not be
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* positive. Glyph indices can be found in every font.
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*
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* (b) by the name of the glyph, such as 'A', 'plusminus' or
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* 'ogonek'. Note: Not all fonts contain glyph names, and if a font
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* contains glyph names, they are not always reliable.
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*
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* An encoding file is essentially a list of 256 names of glyphs that
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* TeX wishes to use from a certain font. If the font contains more
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* than 256 glyphs, TeX is still limited to use at most 256 glyphs. If
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* more glyphs are required, TeX can probably use the same font under
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* a different name and with a different encoding ---the map file
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* (fontMap.h) can probably see to that.
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*
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* Summing up: this class contains 256 glyph names read from an
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* encoding file during the construction of this class.
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*
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* @author Stefan Kebekus <kebekus@kde.org>
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*
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**/
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class fontEncoding {
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public:
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// The constructor takes the name of an encoding file, such as
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// '8r.enc', locate the file on the hard disk using the 'kpsewhich'
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// command, reads it in and parses it. If the file cannot be
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// located, opened or parsed, errors are printed using the kdError()
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// channel, and the array glyphNameVector will contain empty
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// strings.
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fontEncoding(const TQString &encName);
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// Full name of the encoding, as read from the encoding file
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TQString encodingFullName;
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// List of 256 glyph names. The name can be '.notdef' to indicate
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// that a certain position is left open, or empty, if the encoding
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// file did not contain 256 characters or could not be properly read
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TQString glyphNameVector[256];
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// Returns 'true' if the encoding file was found and could
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// successfully be loaded.
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bool isValid() {return _isValid;}
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private:
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// Set by the constructor to 'true', if the encoding file was found
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// and could be loaded successfully.
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bool _isValid;
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};
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#endif
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