NAME
   Alien::PNG - building, finding and using PNG binaries

VERSION
   Version 0.4

SYNOPSIS
   Alien::PNG tries (in given order) during its installation:

   *   Locate an already installed PNG via 'libpng-config' script.

   *   Check for PNG libs in directory specified by PNG_INST_DIR variable.
       In this case the module performs PNG library detection via
       '$PNG_INST_DIR/bin/libpng-config' script.

   *   Download prebuilt PNG binaries (if available for your platform).

   *   Build PNG binaries from source codes (if possible on your system).

   Later you can use Alien::PNG in your module that needs to link agains
   PNG and/or related libraries like this:

       # Sample Makefile.pl
       use ExtUtils::MakeMaker;
       use Alien::PNG;

       WriteMakefile(
         NAME         => 'Any::PNG::Module',
         VERSION_FROM => 'lib/Any/PNG/Module.pm',
         LIBS         => Alien::PNG->config('libs', [-lAdd_Lib]),
         INC          => Alien::PNG->config('cflags'),
         # + additional params
       );

DESCRIPTION
   Please see Alien for the manifest of the Alien namespace.

   In short "Alien::PNG" can be used to detect and get configuration
   settings from an installed PNG and related libraries. Based on your
   platform it offers the possibility to download and install prebuilt
   binaries or to build PNG & co. from source codes.

   The important facts:

   *   The module does not modify in any way the already existing PNG
       installation on your system.

   *   If you reinstall PNG libs on your system you do not need to
       reinstall Alien::PNG (providing that you use the same directory for
       the new installation).

   *   The prebuild binaries and/or binaries built from sources are always
       installed into perl module's 'share' directory.

   *   If you use prebuild binaries and/or binaries built from sources it
       happens that some of the dynamic libraries (*.so, *.dll) will not
       automaticly loadable as they will be stored somewhere under perl
       module's 'share' directory. To handle this scenario Alien::PNG
       offers some special functionality (see below).

METHODS
 config()
   This function is the main public interface to this module. Basic
   functionality works in a very similar maner to 'libpng-config' script:

       Alien::PNG->config('prefix');   # gives the same string as 'libpng-config --prefix'
       Alien::PNG->config('version');  # gives the same string as 'libpng-config --version'
       Alien::PNG->config('libs');     # gives the same string as 'libpng-config --libs'
       Alien::PNG->config('cflags');   # gives the same string as 'libpng-config --cflags'

   On top of that this function supports special parameters:

       Alien::PNG->config('ld_shared_libs');

   Returns a list of full paths to shared libraries (*.so, *.dll) that will
   be required for running the resulting binaries you have linked with PNG
   libs.

       Alien::PNG->config('ld_paths');

   Returns a list of full paths to directories with shared libraries (*.so,
   *.dll) that will be required for running the resulting binaries you have
   linked with PNG libs.

       Alien::PNG->config('ld_shlib_map');

   Returns a reference to hash of value pairs '<libnick>' =>
   '<full_path_to_shlib'>, where '<libnick>' is shortname for PNG related
   library like: PNG.

   NOTE: config('ld_<something>') return an empty list/hash if you have
   decided to use PNG libraries already installed on your system. This
   concerns 'libpng-config' detection and detection via
   '$PNG_INST_DIR/bin/libpng-config'.

 check_header()
   This function checks the availability of given header(s) when using
   compiler options provided by "Alien::PNG->config('cflags')".

       Alien::PNG->check_header('png.h');
       Alien::PNG->check_header('png.h', 'pngconf.h');

   Returns 1 if all given headers are available, 0 otherwise.

 get_header_version()
   Tries to find a header file specified as a param in PNG prefix direcotry
   and based on "#define" macros inside this header file tries to get a
   version triplet.

       Alien::PNG->get_header_version('png.h');

   Returns string like '1.2.3' or undef if not able to find and parse
   version info.

BUGS
   Please post issues and bugs at
   <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Alien-PNG>

AUTHOR
       Tobias Leich
       CPAN ID: FROGGS
       [email protected]

ACKNOWLEDGEMENTS
       This module is based on Alien::SDL, so in fact the credits has to be given to these guys.
       kmx - complete redesign between versions 0.7.x and 0.8.x

COPYRIGHT
   This program is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself.

   The full text of the license can be found in the LICENSE file included
   with this module.

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