# man > Font::TTF::Hhea(3pm)

## NAME
    [Font::TTF::Hhea](https://www.chedong.com/phpMan.php/perldoc/Font%3A%3ATTF%3A%3AHhea/markdown) - Horizontal Header table

## DESCRIPTION
    This is a simplte table with just standards specified instance variables

## INSTANCE VARIABLES
        version
        Ascender
        Descender
        LineGap
        advanceWidthMax
        minLeftSideBearing
        minRightSideBearing
        xMaxExtent
        caretSlopeRise
        caretSlopeRun
        metricDataFormat
        numberOfHMetrics

## METHODS
  $t->read
    Reads the table into memory as instance variables

  $t->out($fh)
    Writes the table to a file either from memory or by copying.

  $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->update
    Updates various parameters in the hhea table from the hmtx table.

## 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.