source: general/graphlib/libpng.xml@ 0d7900a

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY libpng-download-http
           "&sourceforge-repo;/libpng/libpng-&libpng-version;.tar.xz">
  <!ENTITY libpng-download-ftp  " ">
  <!ENTITY libpng-md5sum        "0b607a685da977f1bfc96e1c47055183">
  <!ENTITY libpng-size          "692 KB">
  <!ENTITY libpng-buildsize     "9.5 MB">
  <!ENTITY libpng-time          "0.1 SBU">
  <!ENTITY apng-patch
           "&sourceforge-repo;/libpng-apng/libpng-&libpng-version;-apng.patch.gz">
]>

<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. 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>

    &lfs72_checked;

    <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>
          Optional patch to include animated png functionality in
          <application>libpng</application> (required to use the system
          <application>libpng</application> in
          <application>Firefox</application>): <ulink url="&apng-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>
      If you want to patch libpng to support apng files, apply the patch:
    </para>

<screen><userinput>gzip -cd ../libpng-&libpng-version;-apng.patch.gz | patch -p1 &amp;&amp;
START=$(awk '/@/' scripts/symbols.def | sort -k2.3n | tail -1 | cut -d "@" -f2) &amp;&amp;
awk -v v="$START" '/^PNG(_.+)?_EXPORTA?\(/ {gsub(/PNG(_.+)?_EXPORTA?\(/, ""); gsub(/,/, ""); \
if($1 > v) print $3 " @"$1}' png.h | sort -k2.3n &gt;&gt; scripts/symbols.def</userinput></screen>

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

<screen><userinput>./configure --prefix=/usr --disable-static &amp;&amp;
make</userinput></screen>

    <para>
      To test the results, issue: <command>make check</command>.
    </para>

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

<screen role="root"><userinput>make install &amp;&amp;
mkdir /usr/share/doc/libpng-&libpng-version; &amp;&amp;
cp README libpng-manual.txt /usr/share/doc/libpng-&libpng-version;</userinput></screen>
  </sect2>

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

    <para>
      <command>awk -v ...</command>: This command fixes the testsuite
      when APNG patch is applied.
    </para>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
      href="../../xincludes/static-libraries.xml"/>

  </sect2>

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

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

      <seglistitem>
        <seg>
          libpng-config and libpng15-config
        </seg>
        <seg>
          libpng.so and libpng15.so
        </seg>
        <seg>
          /usr/include/libpng15 and
          /usr/share/doc/libpng-&libpng-version;
        </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>libpng15-config</command>.</para>
          <indexterm zone="libpng libpng-config">
            <primary sortas="b-libpng-config">libpng-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libpng15-config">
        <term><command>libpng15-config</command></term>
        <listitem>
          <para>
            is a shell script that provides configuration information for
            applications wanting to use <application>libpng</application>.
          </para>
          <indexterm zone="libpng libpng15-config">
            <primary sortas="b-libpng15-config">libpng15-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libpng15">
        <term><filename class="libraryfile">libpng.so and
        libpng15.so</filename></term>
        <listitem>
          <para>
            contain routines used to create and manipulate PNG format graphics
            files.
          </para>
          <indexterm zone="libpng libpng15">
            <primary sortas="c-libpng15">libpng15.so</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>