Font::TTF::Cmap(3pm) User Contributed Perl Documentation Font::TTF::Cmap(3pm)
NAME
Font::TTF::Cmap - Character map table
DESCRIPTION
Looks after the character map. For ease of use, the actual cmap is held
in a hash against codepoint. Thus for a given table:
$gid = $font->{'cmap'}{'Tables'}[0]{'val'}{$code};
Note that $code should be a true value (0x1234) rather than a string
representation.
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 subtable 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 A hash keyed by the codepoint value (not a string) storing the
glyph id
The following cmap options are controlled by instance variables that
start with a space:
allowholes
By default, when generating format 4 cmap subtables character codes
that point to glyph zero (normally called .notdef) are not included
in the subtable. In some cases including some of these character
codes can result in a smaller format 4 subtable. To enable this
behavior, set allowholes to non-zero.
METHODS
$t->read
Reads the cmap into memory. Format 4 subtables read the whole subtable
and fill in the segmented array accordingly.
$t->ms_lookup($uni)
Finds a Unicode table, giving preference to the MS one, and looks up
the given Unicode codepoint in it to find the glyph id.
$t->find_ms
Finds the a Unicode table, giving preference to the Microsoft one, and
sets the "mstable" instance variable to it if found. Returns the table
it finds.
$t->ms_enc
Returns the encoding of the microsoft table (0 => symbol, etc.).
Returns undef if there is no Microsoft cmap.
$t->out($fh)
Writes out a cmap table to a filehandle. If it has not been read, then
just copies from input file to output
$t->XML_element($context, $depth, $name, $val)
Outputs the elements of the cmap in XML. We only need to process val
here
$t->minsize()
Returns the minimum size this table can be in bytes. If it is smaller
than this, then the table must be bad and should be deleted or
whatever.
$t->update
Tidies the cmap table.
Removes MS Fmt12 cmap if it is no longer needed.
Removes from all cmaps any codepoint that map to GID=0. Note that such
entries will be re-introduced as necessary depending on the cmap
format.
@map = $t->reverse(%opt)
Returns a reverse map of the Unicode cmap. I.e. given a glyph gives the
Unicode value for it. Options are:
tnum
Table number to use rather than the default Unicode table
array
Returns each element of reverse as an array since a glyph may be
mapped by more than one Unicode value. The arrays are unsorted.
Otherwise store any one unicode value for a glyph.
is_unicode($index)
Returns whether the table of a given index is known to be a unicode
table (as specified in the specifications)
BUGS
• Format 14 (Unicode Variation Sequences) cmaps are not supported.
AUTHOR
Martin Hosken <http://scripts.sil.org/FontUtils>.
LICENSING
Copyright (c) 1998-2016, SIL International (http://www.sil.org)
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.
perl v5.34.0 2022-06-14 Font::TTF::Cmap(3pm)
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