source: general/graphlib/libpng.xml@ b690f72

<?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        "0f7ae352beadaff78073733905613041">
  <!ENTITY libpng-size          "685 KB">
  <!ENTITY libpng-buildsize     "8.3 MB">
  <!ENTITY libpng-time          "0.1 SBU">
  <!ENTITY apng-patch
  "&sourceforge-repo2;/projects/libpng-apng/files/libpng15/&libpng-version;/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>

    &lfs70_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> : <ulink url="&apng-patch;"/></para>
        <para>The patch is required if you want to use the system
        <application>libpng</application> in
        <application>Firefox</application>.</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;
awk '/10[0-2][0-9],/{ gsub(/,png/, ", png")
  gsub(/PNG_EXPORT./, "")
  gsub(/,/, "")
  print " " $3 " @" $1 }' png.h >> scripts/symbols.def &amp;&amp;
sed -i 's#ORDINAL(233)#ORDINAL(1020)#' png.h &amp;&amp;
sed -i 's#"error"#"ignore"#' scripts/checksym.awk &amp;&amp;</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 '/10[0-2][0-9] ...</command>, <command>sed -i 's#ORDINAL
    ...</command> and <command>sed -i 's#"error" ...</command>: These commands
    massage the test suite to accept the animated png functions.</para>

    <para><option>--disable-static</option>: This option prevents it compiling
    the static archive versions of the libraries.</para>
  </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="g-libpng-config">libpng-config</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libpng15-config">
        <term><command>libpng15-config</command></term>
        <listitem>
          <para>provides configuration information for
          <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>