Font::TTF::Delta(3) User Contributed Perl Documentation Font::TTF::Delta(3)

# [NAME](#NAME)

Font::TTF::Delta - Opentype Device tables

# [DESCRIPTION](#DESCRIPTION)

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

[first](#first)

The first ppem value in the range

[last](#last)

The last ppem value in the range

[val](#val)

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

[fmt](#fmt)

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

# [METHODS](#METHODS)

## [new](#new)

Creates a new device table

## [read](#read)

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

## [out($fh, $style)](#out%28$fh,_$style%29)

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

## [$d->**signature()**](#$d)

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

## [$d->out\_xml($context)](#$d~2)

Outputs a delta in XML

# [AUTHOR](#AUTHOR)

Martin Hosken <http://scripts.sil.org/FontUtils>.

# [LICENSING](#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.

2026-09-25 perl v5.44.0

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Document: Font::TTF::Delta(3pm) from perl-font-ttf 1.06-r0 (Chainguard OS)