mirror of
https://github.com/openharmony/third_party_giflib.git
synced 2026-07-01 06:41:59 -04:00
mamingshuai
110 lines
3.7 KiB
HTML
110 lines
3.7 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1"?>
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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>
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<head>
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<link rev='made' href='mailto:esr@snark.thyrsus.com' />
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<meta name='MSSmartTagsPreventParsing' content='TRUE' />
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<title>The GIFLIB project</title>
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<script type="text/javascript">
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// JavaScript to generate a compact date representation
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//
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// format date as yyyy-mm-dd
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//
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function date_ddmmmyyyy(date)
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{
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var d = date.getDate();
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var m = date.getMonth() + 1;
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var y = date.getFullYear();
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return "" + y + "-" + (m<10?"0"+m:m) + "-" + (d<10?"0"+d:d);
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}
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//
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// get last modified date of the
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// current document.
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//
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function date_lastmodified()
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{
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var lmd = document.lastModified;
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var s = "Unknown";
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var d1;
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// check if we have a valid date
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// before proceeding
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if(0 != (d1=Date.parse(lmd)))
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{
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s = "" + date_ddmmmyyyy(new Date(d1));
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}
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return s;
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}
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// End
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</script>
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</head>
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<body>
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<table width='100%' cellpadding='0' summary='Canned page header' bgcolor="#ddd">
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<tr>
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<td><h2>The GIFLIB project</h2></td>
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<td align="center"><img src="giflib-logo.gif"></td>
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<td align='right'><script type="text/javascript">
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document.write(date_lastmodified());
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</script></td>
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</tr>
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</table>
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<p>The GIFLIB project maintains the giflib service library, which has
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been pulling images out of GIFs since 1989. It is deployed everywhere
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you can think of and some places you probably can't - graphics
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applications and web browsers on multiple operating systems, game
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consoles, smartphones, and likely your ATM too.</p>
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<p>Yes, this code is he reason GIFs were in Mosaic, the first web
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browser that could do inline graphics; it is the implementation
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Andreesen and Bina used.</p>
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<p>This is very mature, stable, small-footprint code with minimal
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dependencies (suitable for use in embedded deployments) that needs only
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occasional very minor bugfixes. Test reports from odd platforms and
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better regression tests are particularly welcome. Don't try to
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redesign it, applications beyond counting would break if you did.</p>
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<p>It's "GIFLIB" in caps as a nod to the code's origins in the dark
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and backward abysm of MS-DOS, but Unix hackers are encouraged to spell it
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"giflib" in deference to local conventions. :-)
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<p>You can read GIFLIB's documentation <a href="intro.html">here</a>
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and a very detailed description of GIF <a
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href="whatsinagif/index.html">here</a>. People to thank for this code:
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Gershon Elber, Eric S. Raymond, Toshio Kuratomi.</p>
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<p>Before October 2006 the GIF format was encumbered by patents on the
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LZW compression it uses. This first became an issue in 1993 when the
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patent-holders made ambiguous noises about requiring royalties. For
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some time a subset of this code travelled as "libungif", supporting
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decompression but not compression. You can read a more detailed
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history <a href="history.html">here</a>.</p>
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<p>Note: The 5.x versions change the API slightly in a way that isn't
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compatible with older shared libraries. This was required to fix
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some known problems with the extensions API and with thread-safety.</p>
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<p>If you require shared-library compatibility back to ancient
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versions, build from 4.2. 4.2 and the 5.0 version are behaviorally
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almost identical; the few differences are explained <a
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href="gif_lib.html#compatibility">here</a>.
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<p>The SourceForge summary page (where you can download the source,
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review the project, find links to the bugtracker and mailing list
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pages, or ask to join the project as a developer) is <a
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href="https://sourceforge.net/projects/giflib/">here</a>.
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<p>If you appreciate this project, and especially if you make money
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from it, please <a href="https://www.patreon.com/esr">support
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continuing maintainance on Patreon</a>.</p>
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</body>
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</html>
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