# Font::TTF::Head - phpMan

## NAME
    [Font::TTF::Head] - The head table for a TTF Font

## DESCRIPTION
    This is a very basic table with just instance variables as described in
    the TTF documentation, using the same names. One of the most commonly
    used is "unitsPerEm".

## INSTANCE VARIABLES
    The "head" table has no internal instance variables beyond those common
    to all tables and those specified in the standard:

        version
        fontRevision
        checkSumAdjustment
        magicNumber
        flags
        unitsPerEm
        created
        modified
        xMin
        yMin
        xMax
        yMax
        macStyle
        lowestRecPPEM
        fontDirectionHint
        indexToLocFormat
        glyphDataFormat

    The two dates are held as an array of two unsigned longs (32-bits)

## METHODS
  $t->read
    Reads the table into memory thanks to some utility functions

  $t->out($fh)
    Writes the table to a file either from memory or by copying. If in
    memory (which is usually) the checkSumAdjustment field is set to 0 as
    per the default if the file checksum is not to be considered.

  $t->minsize()
    Returns the minimum size this table can be. If it is smaller than this,
    then the table must be bad and should be deleted or whatever.

  $t->XML_element($context, $depth, $key, $value)
    Handles date process for the XML exporter

  $t->update
    Updates the head table based on the glyph data and the hmtx table

  $t->getdate($is_create)
    Converts font modification time (or creation time if $is_create is set)
    to a 32-bit integer as returned from time(). Returns undef if the value
    is out of range, either before the epoch or after the maximum storable
    time.

  $t->setdate($time, $is_create)
    Sets the time information for modification (or creation time if
    $is_create is set) according to the 32-bit time information.

## BUGS
    None known

## 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.