# Font::TTF::Hmtx - phpMan

## NAME
    [Font::TTF::Hmtx] - Horizontal Metrics

## DESCRIPTION
    Contains the advance width and left side bearing for each glyph. Given
    the compressability of the data onto disk, this table uses information
    from other tables, and thus must do part of its output during the output
    of other tables

## INSTANCE VARIABLES
    The horizontal metrics are kept in two arrays by glyph id. The variable
    names do not start with a space

    advance
        An array containing the advance width for each glyph

    lsb An array containing the left side bearing for each glyph

## METHODS
  $t->read
    Reads the horizontal metrics from the TTF file into memory

  $t->numMetrics
    Calculates again the number of long metrics required to store the
    information here. Returns undef if the table has not been read.

  $t->out($fh)
    Writes the metrics to a TTF file. Assumes that the "hhea" has updated
    the numHMetrics from here

  $t->update
    Updates the lsb values from the xMin from the each glyph

  $t->out_xml($context, $depth)
    Outputs the table in XML

## 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.