---
name: "Font::TTF::Delta"
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::Delta"
---

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

Opentype Device tables

## NAME

Font::TTF::Delta - Opentype Device tables

## DESCRIPTION

Each device table corresponds to a set of deltas for a particular point over a range of ppem values.

- first

  The first ppem value in the range

- last

  The last ppem value in the range

- val

  This is an array of deltas corresponding to each ppem in the range between first and last inclusive.

- fmt

  This is the fmt used (log2 of number bits per value) when the device table was read. It is recalculated on output.

## METHODS

### new

Creates a new device table

### read

Reads a device table from the given IO object at the current location

### out($fh, $style)

Outputs a device table to the given IO object at the current location, or just returns the data to be output if `$style` != 0

### $d-\>signature()

Returns a content based identifying string for this delta for compression purposes

### $d-\>out\_xml($context)

Outputs a delta in XML

## 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.