---
name: "PDF::API2::Basic::TTF::Vmtx"
section: "3pm"
platform: "linux"
package: "libpdf-api2-perl"
version: "0.73-1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/PDF::API2::Basic::TTF::Vmtx"
---

# PDF::API2::Basic::TTF::Vmtx(3pm)

Vertical Metrics

## NAME

PDF::API2::Basic::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 Martin\_Hosken@sil.org. See PDF::API2::Basic::TTF::Font for copyright and licensing.