PDF::API2::Basic::TTF::Kern(3pm) - phpMan

PDF::API2::Basic::TTF::Kern(3pmUser Contributed Perl DocumentatioPDF::API2::Basic::TTF::Kern(3pm)



NAME
       PDF::API2::Basic::TTF::Kern - Kerning tables

DESCRIPTION
       Kerning tables are held as an ordered collection of subtables each giving incremental
       information regarding the kerning of various pairs of glyphs.

       The basic structure of the kerning data structure is:

           $kern = $f->{'kern'}{'tables'}[$tnum]{'kerns'}{$leftnum}{$rightnum};

       Due to the possible complexity of some kerning tables the above information is
       insufficient. Reference also needs to be made to the type of the table and the coverage
       field.

INSTANCE VARIABLES
       The instance variables for a kerning table are relatively straightforward.

       Version
           Version number of the kerning table

       Num Number of subtables in the kerning table

       tables
           Array of subtables in the kerning table

               Each subtable has a number of instance variables.

               kern

               A two level hash array containing kerning values. The indexing is left value and
               then right value. In the case of type 2 tables, the indexing is via left class and
               right class. It may seem using hashes is strange, but most tables are not type 2
               and this method saves empty array values.

               type

               Stores the table type. Only type 0 and type 2 tables are specified for TrueType so
               far.

               coverage

               A bit field of coverage information regarding the kerning value. See the TrueType
               specification for details.

               Version

               Contains the version number of the table.

               Num

               Number of kerning pairs in this type 0 table.

               left

               An array indexed by glyph - left_first which returns a class number for the glyph
               in type 2 tables.

               right

               An array indexed by glyph - right_first which returns a class number for the glyph
               in type 2 tables.

               left_first

               the glyph number of the first element in the left array for type 2 tables.

               right_first

               the glyph number of the first element in the right array for type 2 tables.

               num_left

               Number of left classes

               num_right

               Number of right classes

METHODS
       $t->read

       Reads the whole kerning table into structures

       $t->out($fh)

       Outputs the kerning tables to the given file

       $t->XML_element($context, $depth, $key, $value)

       Handles outputting the kern hash into XML a little more tidily

BUGS
       o   Only supports kerning table types 0 & 2.

       o   No real support functions to do anything with the kerning tables yet.

AUTHOR
       Martin Hosken Martin_Hosken AT sil.org. See PDF::API2::Basic::TTF::Font for copyright and
       licensing.

POD ERRORS
       Hey! The above document had some coding errors, which are explained below:

       Around line 64:
           You can't have =items (as at line 68) unless the first thing after the =over is an
           =item



perl v5.10.0                                2005-11-16           PDF::API2::Basic::TTF::Kern(3pm)

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