NAME
    Algorithm::Scale2x - Generic implementation of the Scale2x algorithm

SYNOPSIS
        use Algorithm::Scale2x;

        # optionally exported
        # use Algorithm::Scale2x qw( scale2x scale3x );

        # To start, you must grab a pixel plus all 8 surrounding pixels
        my @pixels = $image->get_pixels( $x, $y ); 

        # scale2x - returns a 2x2 grid of scaled pixels
        my @result2x = Algorithm::Scale2x::scale2x( @pixels );

        # scale3x - returns a 3x3 grid of scaled pixels
        my @result3x = Algorithm::Scale2x::scale3x( @pixels );

DESCRIPTION
    This module provides a generic implementation of the Scale2x and Scale3x
    algorithms. Scale2x is described as:

        ...[a] real-time graphics effect able to increase the size of small bitmaps
        guessing the missing pixels without interpolating pixels and blurring the images.

METHODS
  scale2x( @pixels )
    Given a 3x3 grid of pixels (i.e color index numbers), it will expand the
    centre pixel into 4 new pixels (i.e. 2x scale).

        +---+---+---+
        | 0 | 1 | 2 |    +----+----+
        +---+---+---+    | 4A | 4B |
        | 3 | 4 | 5 | => +----+----+
        +---+---+---+    | 4C | 4D |
        | 6 | 7 | 8 |    +----+----+
        +---+---+---+

  scale3x( @pixels )
    Given a 3x3 grid of pixels (i.e color index numbers), it will expand the
    centre pixel into 9 new pixels (i.e. 3x scale).

        +---+---+---+    +----+----+----+
        | 0 | 1 | 2 |    | 4A | 4B | 4C |
        +---+---+---+    +----+----+----+
        | 3 | 4 | 5 | => | 4D | 4E | 4F |
        +---+---+---+    +----+----+----+
        | 6 | 7 | 8 |    | 4G | 4H | 4I |
        +---+---+---+    +----+----+----+

SEE ALSO
    * http://scale2x.sourceforge.net/
    * http://scale2x.sourceforge.net/algorithm.html

AUTHOR
    Brian Cassidy <bricas@cpan.org>

COPYRIGHT AND LICENSE
    Copyright 2008 by Brian Cassidy

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