Font::TTF::OldCmap

Section: User Contributed Perl Documentation (3)
Updated: 2021-01-27
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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

•: No support for format 2 tables (MBCS)

AUTHOR

Martin Hosken <http://scripts.sil.org/FontUtils>.

LICENSING

This module is released under the terms of the Artistic License 2.0. For details, see the full text of the license in the file LICENSE.