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Palm OS Programming, 2nd Edition
book

Palm OS Programming, 2nd Edition

by Julie McKeehan, Neil Rhodes
October 2001
Intermediate to advanced content levelIntermediate to advanced
704 pages
19h 33m
English
O'Reilly Media, Inc.
Content preview from Palm OS Programming, 2nd Edition

Name

FONT (NFNT)

Synopsis

                     
FONT ID <FontResourceId.n> FONTID <FontId.n> <FontFileName.s>

FONT file format

The file containing the font information is plain ASCII. To understand how it works it is first necessary to understand how a font is arranged in memory. A font consists of four main parts: a header, a bitmap image, a bitmap location table, and an offset/width table. The bitmap image and location table are generated for you automatically.

The ASCII file consists of two parts: the header and the font data (glyph objects). A full font file is provided with the PilRC distribution.

The FONT header has the following fields:

fontType

The purpose of this field is unknown. The ROM fonts define this value to be 36864.

maxWidth

Defined as “maximum character width.” If not set, it is automatically set to the width of the widest character.

kernMax

Defined as “negative of maximum kern value.” The purpose of this field is unknown.

nDescent

Defined as “negative of descent.” The purpose of this field is unknown, and is not used in the ROM fonts.

fRectWidth

Defined as “width of font rectangle.” If not set, it is automatically set to the width of the widest character.

fRectHeight

Defined as “height of font rectangle.” If not set, it is automatically set when the first glyph is defined.

All characters must be exactly this height.

ascent

The number of rows that make up the ascending part of the glyphs. Ascent plus descent equals fRectHeight. This value should be set.

descent

The number of rows that make ...

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Publisher Resources

ISBN: 1565928563Errata Page