source: general/graphlib/libpng.xml@ ebabf24

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
   "http://www.oasis-open.org/docbook/xml/4.4/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 " ">
  <!ENTITY libpng-md5sum "00cea4539bea4bd34cbf8b82ff9589cd">
  <!ENTITY libpng-size "376 KB">
  <!ENTITY libpng-buildsize "5.75 MB">
  <!ENTITY libpng-time "0.13 SBU">
]>

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

  <sect1info>
    <othername>$LastChangedBy$</othername>
    <date>$Date$</date>
  </sect1info>

  <title>Libpng-&libpng-version;</title>

  <indexterm zone="libpng">
    <primary sortas="a-Libpng">Libpng</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Libpng</title>

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

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <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 MD5 sum: &libpng-md5sum;</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>

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

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/libpng"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Libpng</title>

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

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

    <para>To test the results, issue: <command>make -f scripts/makefile.linux
    test</command>.</para>

    <para>Now, as the <systemitem class="username">root</systemitem> user:</para>

<screen role="root"><userinput>make prefix=/usr install -f scripts/makefile.linux</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para><parameter>ZLIBINC=; ZLIBLIB=</parameter>: This
    forces <application>libpng</application> to look for the
    <application>Zlib</application> includes and libraries in the default locations
    (<filename class='directory'>/usr/include</filename> and
    <filename class='directory'>/usr/lib</filename> respectively).</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 role="configuration">
    <title>Configuring Libpng</title>

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

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

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directory</segtitle>

      <seglistitem>
        <seg>libpng-config and libpng12-config</seg>
        <seg>libpng.{so,a} and libpng12.{so,a}</seg>
        <seg>/usr/include/libpng12</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="libpng-config">
        <term><command>libpng-config</command></term>
        <listitem>
          <para>is a symlink to <command>libpng12-config</command>.</para>
          <indexterm zone="libpng libpng-config">
            <primary sortas="g-libpng-config">libpng-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libpng12-config">
        <term><command>libpng12-config</command></term>
        <listitem>
          <para>provides configuration information for
          <application>libpng</application>.</para>
          <indexterm zone="libpng libpng12-config">
            <primary sortas="b-libpng12-config">libpng12-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libpng12">
        <term><filename class='libraryfile'>libpng.{so,a} and
        libpng12.{so,a}</filename></term>
        <listitem>
          <para>are a collection of routines used to create and manipulate PNG
          format graphics files. The PNG format was designed as a replacement for
          GIF and, to a lesser extent, TIFF, with many improvements and extensions
          and lack of patent problems.</para>
          <indexterm zone="libpng libpng12">
            <primary sortas="c-libpng">libpng.{so,a}</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>