68 lines
4.1 KiB
HTML
68 lines
4.1 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>AFP fonts</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzau6fonts"></a>
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<h3 id="rzau6fonts">AFP fonts</h3>
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<p>A font is a collection of characters of a certain size, typeface, and type
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style. Each character in a font is identified by a 1-byte (single-byte) or
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a 2-byte (double-byte) code. The internal structure of fonts depends on whether
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the font is for a phonetic or a non-phonetic writing system. An example of
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a phonetic writing system is English. An example of a non-phonetic writing
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system is Kanji. Advanced Function Presentation™ (AFP™) fonts (or Font
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Object Content Architecture (FOCA) fonts) are the standard fonts used for Intelligent Printer Data Stream™ (IPDS™) output. AFP fonts are made up of a code page and a
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character set, which are described in greater detail later. All AFP fonts are encoded
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as either single-byte or double-byte fonts, depending on the language for
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which they are being used.</p>
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<p>At least two resources are needed to make up a font: a font character
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set and a code page. The relationship between code pages and font character
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sets is illustrated in <a href="rzau6fonts.htm#rzau6translate">Figure 1</a>. A third resource, a
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coded font, can define a font by naming a font character set and a code page.</p>
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<dl>
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<dt class="bold">Font character set</dt>
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<dd>This resource contains the patterns for each character in the font and
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associates an 8-byte character identifier with each pattern. This resource
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also contains descriptive information for the entire character set.
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</dd>
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<dt class="bold">Code page</dt>
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<dd>This resource associates code points with character identifiers within
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a font character set, each representing a character pattern. A code point
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is an 8-bit binary number representing one of 256 potential characters.
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</dd>
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<dt class="bold">Coded font</dt>
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<dd>This resource associates one or more code pages with the appropriate
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font character sets.
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</dd>
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</dl>
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<a name="rzau6translate"></a>
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<div class="fignone" id="rzau6translate"><span class="figcap">Figure 1. Translation of a keyboard character into a printed character</span>
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<div class="mmobj">
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<img src="c5pu0085.gif" alt="This figure shows what is described in the text. It shows the letter A being pressed on a keyboard. "A" is Code point C1 on our code page and Character ID LA020000. Character ID LA020000 in our character set is an "A" in the selected style. An "A" prints on the page. The code page and character set together make a coded font." /></div></div>
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<p><span class="bold">Related tasks</span></p>
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<p><a href="rzau6getrsc.htm#rzau6getrsc">Obtain AFP resources</a></p>
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<p><a href="rzau6specfnt.htm#rzau6specfnt">Specify an AFP font</a></p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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