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 preceeded 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 preceeded 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
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)
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
@map = $t->reverse(%opt)
Returns a reverse map of the Unicode cmap. I.e. given a glyph gives the Unicode value for it. Options are:
- tnum
-
Table number to use rather than the default Unicode table
- array
-
Returns each element of reverse as an array since a glyph may be mapped by more than one Unicode value. The arrays are unsorted.
is_unicode($index)
Returns whether the table of a given index is known to be a unicode table (as specified in the specifications)
BUGS
No support for format 2 tables (MBCS)
AUTHOR
Martin Hosken Martin_Hosken@sil.org. See Font::TTF::Font for copyright and licensing.