---
name: "Font::TTF::Vmtx"
section: "3pm"
platform: "linux"
package: "perl-font-ttf"
version: "1.06-6"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Font::TTF::Vmtx"
---

# Font::TTF::Vmtx(3pm)

Vertical Metrics

## NAME

Font::TTF::Vmtx - Vertical Metrics

## DESCRIPTION

Contains the advance height and top 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 vertical metrics are kept in two arrays by glyph id. The variable names do not start with a space

- advance

  An array containing the advance height for each glyph

- top

  An array containing the top side bearing for each glyph

## METHODS

### $t-\>read

Reads the vertical metrics from the TTF file into memory

### $t-\>out($fh)

Writes the metrics to a TTF file. Assumes that the `"vhea"` has updated the numVMetrics from here

## 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.