Font::TTF::Table(3) User Contributed Perl Documentation Font::TTF::Table(3)
Font::TTF::Table - Superclass for tables and used for tables we don't have a class for
Looks after the purely table aspects of a TTF table, such as whether the table has been
read before, locating the file pointer, etc. Also copies tables from input to output.
Instance variables start with a space
Flag which indicates that the table has already been read from file.
dat Allows the creation of unspecific tables. Data is simply output to any font file being
If set, overrides the font default for WOFF table compression. Is a scalar integer
specifying a table size threshold below which this table will not be compressed. Set
to -1 to never compress; 0 to always compress.
The read file handle
Location of the file in the input file
Length in the input directory
Compressed length of the table if a WOFF font. 0 < ZLENGTH < LENGTH implies table is
Checksum read from the input file's directory
The Font::TTF::Font that table is part of
Creates a new table or subclass. Table instance variables are passed in at this point as
an associative array.
Reads the table from the input file. Acts as a superclass to all true tables. This method
marks the table as read and then just sets the input file pointer but does not read any
data. If the table has already been read, then returns "undef" else returns $self
Reads the table into the "dat" instance variable for those tables which don't know any
Writes out the table to the font file. If there is anything in the "dat" instance variable
then this is output, otherwise the data is copied from the input file to the output
Outputs this table in XML format. The table is first read (if not already read) and then
if there is no subclass, then the data is dumped as hex data
Output a particular element based on its contents.
$t->XML_end($context, $tag, %attrs)
Handles the default type of <data> for those tables which aren't subclassed
This sets the dirty flag to the given value or 1 if no given value. It returns the value
of the flag
Each table knows how to update itself. This consists of doing whatever work is required to
ensure that the memory version of the table is consistent and that other parameters in
other tables have been updated accordingly. I.e. by the end of sending "update" to all
the tables, the memory version of the font should be entirely consistent.
Some tables which do no work indicate to themselves the need to update themselves by
setting isDirty above 1. This method resets that accordingly.
Clears a table of all data to the level of not having been read
Releases ALL of the memory used by this table, and all of its component/child objects.
This method is called automatically by 'Font::TTF::Font->release' (so you don't have to
call it yourself).
NOTE, that it is important that this method get called at some point prior to the actual
destruction of the object. Internally, we track things in a structure that can result in
circular references, and without calling '"release()"' these will not properly get cleaned
up by Perl. Once this method has been called, though, don't expect to be able to do
anything with the "Font::TTF::Table" object; it'll have no internal state whatsoever.
Developer note: As part of the brute-force cleanup done here, this method will throw a
warning message whenever unexpected key values are found within the "Font::TTF::Table"
object. This is done to help ensure that any unexpected and unfreed values are brought to
your attention so that you can bug us to keep the module updated properly; otherwise the
potential for memory leaks due to dangling circular references will exist.
No known bugs
Martin Hosken Martin_Hosken@sil.org. See Font::TTF::Font for copyright and licensing.
perl v5.16.3 2012-02-23 Font::TTF::Table(3)