source: general/graphlib/libpng.xml@ da4aff6

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
   "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

<!ENTITY libpng-download-http "http://prdownloads.sourceforge.net/libpng/libpng-&libpng-version;.tar.bz2">
<!ENTITY libpng-download-ftp "ftp://ftp.iasi.roedu.net/pub/mirrors/ftp.gimp.org/gimp/libs/libpng-&libpng-version;.tar.bz2">
<!ENTITY libpng-size "376 KB">
<!ENTITY libpng-buildsize "4.1 MB">
<!ENTITY libpng-time "0.16 SBU">

]>

<sect1 id="libpng" xreflabel="libpng-&libpng-version;">
<?dbhtml filename="libpng.html"?>
<title>libpng-&libpng-version;</title>

<sect2>
<title>Introduction to <application>libpng</application></title>

<para>The <application>libpng</application> package contains libraries used
by other programs for reading and writing <acronym>PNG</acronym> files.</para>

<sect3><title>Package information</title>
<itemizedlist spacing='compact'>
<listitem><para>Download (HTTP): <ulink
url="&libpng-download-http;"/></para></listitem>
<listitem><para>Download (FTP): <ulink
url="&libpng-download-ftp;"/></para></listitem>
<listitem><para>Download size: &libpng-size;</para></listitem>
<listitem><para>Estimated Disk space required:
&libpng-buildsize;</para></listitem>
<listitem><para>Estimated build time:
&libpng-time;</para></listitem></itemizedlist>
</sect3>

<sect3><title>Additional downloads</title>
<itemizedlist spacing='compact'>
<listitem><para>Required Patch to explicitly link libpng against system libraries: <ulink
url="&patch-root;/libpng-&libpng-version;-link_to_proper_libs-1.patch"/></para></listitem>
</itemizedlist></sect3>

</sect2>

<sect2>
<title>Installation of <application>libpng</application></title>

<para>Install <application>libpng</application> by running the following 
commands:</para>

<screen><userinput><command>patch -Np1 -i ../libpng-&libpng-version;-link_to_proper_libs-1.patch &amp;&amp;
make prefix=/usr ZLIBINC=/usr/include \
    ZLIBLIB=/usr/lib -f scripts/makefile.linux &amp;&amp;
make prefix=/usr install -f scripts/makefile.linux</command></userinput></screen>

</sect2>

<sect2>
<title>Command explanations</title>

<para><parameter>ZLIBINC=/usr/include ZLIBLIB=/usr/lib</parameter>: This
forces <application>libpng</application> to look for the
<application>zlib</application> includes and libraries where they are 
installed.</para>

<para><parameter>-f scripts/makefile.linux</parameter>: This points 
<command>make</command> at the <application>Linux</application> version of the 
<filename>Makefile</filename> as <application>libpng</application> doesn't use 
an <application>autoconf</application> routine. Instead it has various 
<filename>Makefile</filename>s for different platforms.</para>

</sect2>

<sect2>
<title>Configuring <application>libpng</application></title>

<sect3><title>Configuration Information</title>

<xi:include xmlns:xi="http://www.w3.org/2003/XInclude" href="../../lib-config.xml"/>

</sect3>

</sect2>

<sect2>
<title>Contents</title>

<para>The <application>libpng</application> package contains 
<filename class="libraryfile">libpng</filename> libraries and 
<command>libpng-config</command>.</para>

</sect2>

<sect2><title>Description</title>

<sect3><title>png libraries</title>
<para>The <acronym>PNG</acronym> library is a collection of routines used to
create and manipulate <acronym>PNG</acronym> format graphics files. The
<acronym>PNG</acronym> format was designed as a
replacement for <acronym>GIF</acronym> and, to a lesser extent,
<acronym>TIFF</acronym>, with many improvements and extensions and lack of
patent problems.</para></sect3>

<sect3><title>libpng-config</title>
<para><command>libpng-config</command> provides configuration info for
<application>libpng</application>.</para></sect3>

</sect2>

</sect1>