font::ttf::gsub(3) [centos man page]

Font::TTF::GSUB(3)					User Contributed Perl Documentation					Font::TTF::GSUB(3)

NAME

       Font::TTF::GSUB - Module support for the GSUB table in conjunction with TTOpen

DESCRIPTION

       Handles the GSUB subtables in relation to Ttopen tables. Due to the variety of different lookup types, the data structures are not all that
       straightforward, although I have tried to make life easy for myself when using this!

INSTANCE VARIABLES

       The structure of a GSUB table is the same as that given in Font::TTF::Ttopen.  Here we give some of the semantics specific to GSUB lookups.

       ACTION_TYPE
	   This is a string taking one of 4 values indicating the nature of the information in the ACTION array of the rule:

	   g	   The action contains a string of glyphs to replace the match string by

	   l	   The action array contains a list of offsets and lookups to run, in order, on the matched string

	   a	   The action array is an unordered set of optional replacements for the matched glyph. The application should make the selection
		   somehow.

	   o	   The action array is empty (in fact there is no rule array for this type of rule) and the ADJUST value should be added to the
		   glyph id to find the replacement glyph id value

       MATCH_TYPE
	   This indicates which type of information the various MATCH arrays (MATCH, PRE, POST) hold in the rule:

	   g	   The array holds a string of glyph ids which should match exactly

	   c	   The array holds a sequence of class definitions which each glyph should correspondingly match to

	   o	   The array holds offsets to coverage tables

CORRESPONDANCE TO LAYOUT TYPES

       The following table gives the values for ACTION_TYPE and MATCH_TYPE for each of the 11 different lookup types found in the GSUB table
       definition I have:

		       1.1 1.2 2   3   4   5.1 5.2 5.3 6.1 6.2 6.3
	 ACTION_TYPE	o   g  g   a   g    l	l   l	l   l	l
	 MATCH_TYPE		       g    g	c   o	g   c	o

       Hopefully, the rest of the uses of the variables should make sense from this table.

METHODS

   $t->read_sub($fh, $lookup, $index)
       Asked by the superclass to read in from the given file the indexth subtable from lookup number lookup. The file is positioned ready for the
       read.

   $t->extension
       Returns the table type number for the extension table

   $t->out_sub($fh, $lookup, $index)
       Passed the filehandle to output to, suitably positioned, the lookup and subtable index, this function outputs the subtable to $fh at that
       point.

AUTHOR

       Martin Hosken Martin_Hosken@sil.org. See Font::TTF::Font for copyright and licensing.

perl v5.16.3							    2011-10-13							Font::TTF::GSUB(3)

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Font::TTF::OldCmap(3pm) 				User Contributed Perl Documentation				   Font::TTF::OldCmap(3pm)

NAME

       Font::TTF::OldCmap - Character map table

       This module is deprecated

DESCRIPTION

       Looks after the character map. The primary structure used for handling a cmap is the Font::TTF::Segarr which handles the segmented arrays
       of format 4 tables, and in a simpler form for format 0 tables.

       Due to the complexity of working with segmented arrays, most of the handling of such arrays is via methods rather than via instance
       variables.

       One important feature of a format 4 table is that it always contains a segment with a final address of 0xFFFF. If you are creating a table
       from scratch this is important (although Font::TTF::Segarr can work quite happily without it).

INSTANCE VARIABLES

       The instance variables listed here are not preceded by a space due to their emulating structural information in the font.

       Num Number of subtables in this table

       Tables
	   An array of subtables ([0..Num-1])

       Each subtables also has its own instance variables which are, again, not preceded by a space.

       Platform
	   The platform number for this subtable

       Encoding
	   The encoding number for this subtable

       Format
	   Gives the stored format of this subtable

       Ver Gives the version (or language) information for this subtable

       val This points to a Font::TTF::Segarr which contains the content of the particular subtable.

METHODS

   $t->read
       Reads the cmap into memory. Format 4 subtables read the whole subtable and fill in the segmented array accordingly.

       Format 2 subtables are not read at all.

   $t->ms_lookup($uni)
       Given a Unicode value in the MS table (Platform 3, Encoding 1) locates that table and looks up the appropriate glyph number from it.

   $t->find_ms
       Finds the Microsoft Unicode table and sets the "mstable" instance variable to it if found. Returns the table it finds.

   $t->out($fh)
       Writes out a cmap table to a filehandle. If it has not been read, then just copies from input file to output

   @map = $t->reverse([$num])
       Returns a reverse map of the table of given number or the Microsoft cmap. I.e. given a glyph gives the Unicode value for it.

BUGS

       o   No support for format 2 tables (MBCS)

AUTHOR

       Martin Hosken Martin_Hosken@sil.org. See Font::TTF::Font for copyright and licensing.

perl v5.10.1							    2011-02-25						   Font::TTF::OldCmap(3pm)

Linux and UNIX Man Pages

font::ttf::gsub(3) [centos man page]

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