Tobias Leich > Alien-PNG-0.1 > Alien::PNG

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Module Version: 0.1   Source  

NAME ^

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

VERSION ^

Version 0.1

SYNOPSIS ^

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

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:

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
    FROGGS@cpan.org

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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