NAME
    Math::Image::CalcResized - Calculate dimensions of image/video resized
    by ImageMagick-like geometry specification

VERSION
    This document describes version 0.002 of Math::Image::CalcResized (from
    Perl distribution Math-Image-CalcResized), released on 2020-09-23.

FUNCTIONS
  calc_image_resized_size
    Usage:

     calc_image_resized_size(%args) -> [status, msg, payload, meta]

    Given size of an image (in WxH, e.g. "2592x1944") and ImageMagick-like
    resize instruction (e.g. "1024p>"), calculate new resized image.

    Examples:

    *   Example #1:

         calc_image_resized_size(size => "2592x1944", resize => "20%"); # -> "518x388"

    *   Example #2:

         calc_image_resized_size(size => "2592x1944", resize => "20%x40%"); # -> "518x777"

    *   Example #3:

         calc_image_resized_size(size => "2592x1944", resize => "20x40%"); # -> "518x777"

    *   Example #4:

         calc_image_resized_size(size => "2592x1944", resize => 1024); # -> "1024x768"

    *   Example #5:

         calc_image_resized_size(size => "2592x1944", resize => "1024>"); # -> "1024x768"

    *   Example #6:

         calc_image_resized_size(size => "2592x1944", resize => "10240>"); # -> "2592x1944"

    *   Example #7:

         calc_image_resized_size(size => "2592x1944", resize => "1024^"); # -> "2592x1944"

    *   Example #8:

         calc_image_resized_size(size => "2592x1944", resize => "10240^"); # -> "10240x7680"

    *   Example #9:

         calc_image_resized_size(size => "2592x1944", resize => "x1024"); # -> "1365x1024"

    *   Example #10:

         calc_image_resized_size(size => "2592x1944", resize => "x768>"); # -> "1024x768"

    *   Example #11:

         calc_image_resized_size(size => "2592x1944", resize => "x7680>"); # -> "2592x1944"

    *   Example #12:

         calc_image_resized_size(size => "2592x1944", resize => "x768^"); # -> "2592x1944"

    *   Example #13:

         calc_image_resized_size(size => "2592x1944", resize => "x7680^"); # -> "10240x7680"

    *   Example #14:

         calc_image_resized_size(size => "2592x1944", resize => "20000x10000"); # -> "2592x1944"

    *   Example #15:

         calc_image_resized_size(size => "2592x1944", resize => "20000x1000"); # -> "1333x1000"

    *   Example #16:

         calc_image_resized_size(size => "2592x1944", resize => "100x200"); # -> "100x75"

    *   Example #17:

         calc_image_resized_size(size => "2592x1944", resize => "100x100"); # -> "100x75"

    *   Example #18:

         calc_image_resized_size(size => "2592x1944", resize => "10000x5000^"); # -> "10000x7500"

    *   Example #19:

         calc_image_resized_size(size => "2592x1944", resize => "5000x10000^"); # -> "13333x10000"

    *   Example #20:

         calc_image_resized_size(size => "2592x1944", resize => "100x100^"); # -> "2592x1944"

    *   Example #21:

         calc_image_resized_size(size => "2592x1944", resize => "100x100!"); # -> "100x100"

    *   Example #22:

         calc_image_resized_size(size => "2592x1944", resize => "10000x5000>"); # -> "2592x1944"

    *   Example #23:

         calc_image_resized_size(size => "2592x1944", resize => "5000x10000>"); # -> "2592x1944"

    *   Example #24:

         calc_image_resized_size(size => "2592x1944", resize => "3000x1000>"); # -> "2592x1944"

    *   Example #25:

         calc_image_resized_size(size => "2592x1944", resize => "2000x1000>"); # -> "1333x1000"

    *   Example #26:

         calc_image_resized_size(size => "2592x1944", resize => "100x100>"); # -> "100x75"

    *   Example #27:

         calc_image_resized_size(size => "2592x1944", resize => "10000x5000<"); # -> "10000x7500"

    *   Example #28:

         calc_image_resized_size(size => "2592x1944", resize => "5000x10000<"); # -> "13333x10000"

    *   Example #29:

         calc_image_resized_size(size => "2592x1944", resize => "3000x1000<"); # -> "2592x1944"

    *   Example #30:

         calc_image_resized_size(size => "2592x1944", resize => "2000x1000<"); # -> "2592x1944"

    *   Example #31:

         calc_image_resized_size(size => "2592x1944", resize => "100x100<"); # -> "2592x1944"

    *   Example #32:

         calc_image_resized_size(size => "2592x1944", resize => "1024^>"); # -> "1365x1024"

    *   Example #33:

         calc_image_resized_size(size => "2592x1944", resize => "10240^>"); # -> "2592x1944"

    *   Example #34:

         calc_image_resized_size(size => "2592x1944", resize => "1024^<"); # -> "2592x1944"

    *   Example #35:

         calc_image_resized_size(size => "2592x1944", resize => "10240^<"); # -> "13653x10240"

    *   Example #36:

         calc_image_resized_size(size => "2592x1944", resize => "^1024>"); # -> "1024x768"

    *   Example #37:

         calc_image_resized_size(size => "2592x1944", resize => "^10240>"); # -> "2592x1944"

    *   Example #38:

         calc_image_resized_size(size => "2592x1944", resize => "^1024<"); # -> "2592x1944"

    *   Example #39:

         calc_image_resized_size(size => "2592x1944", resize => "^10240<"); # -> "10240x7680"

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   resize* => *str*

        Resize instruction, follows ImageMagick format.

        Resize instruction can be given in several formats:

         Syntax                     Meaning
         -------------------------- ----------------------------------------------------------------
         SCALE"%"                   Height and width both scaled by specified percentage.
         SCALEX"%x"SCALEY"%"        Height and width individually scaled by specified percentages. (Only one % symbol needed.)
 
         WIDTH                      Width given, height automagically selected to preserve aspect ratio.
         WIDTH">"                   Shrink width if larger, height automagically selected to preserve aspect ratio.
         WIDTH"^"                   Enlarge width if smaller, height automagically selected to preserve aspect ratio.
 
         "x"HEIGHT                  Height given, width automagically selected to preserve aspect ratio.
         "x"HEIGHT">"               Shrink height if larger, width automagically selected to preserve aspect ratio.
         "x"HEIGHT"^"               Enlarge height if smaller, width automagically selected to preserve aspect ratio.
 
         WIDTH"x"HEIGHT             Maximum values of height and width given, aspect ratio preserved.
         WIDTH"x"HEIGHT"^"          Minimum values of height and width given, aspect ratio preserved.
         WIDTH"x"HEIGHT"!"          Width and height emphatically given, original aspect ratio ignored.
         WIDTH"x"HEIGHT">"          Shrinks an image with dimension(s) larger than the corresponding width and/or height argument(s).
         WIDTH"x"HEIGHT"<"          Shrinks an image with dimension(s) larger than the corresponding width and/or height argument(s).
 
         NUMBER"^>"                 Shrink shortest side if larger than number, aspect ratio preserved.
         NUMBER"^<"                 Enlarge shortest side if larger than number, aspect ratio preserved.
         "^"NUMBER">"               Shrink longer side if larger than number, aspect ratio preserved.
         "^"NUMBER"<"               Enlarge longer side if larger than number, aspect ratio preserved.

        Currently unsupported:

         AREA"@"                    Resize image to have specified area in pixels. Aspect ratio is preserved.
         X":"Y                      Here x and y denotes an aspect ratio (e.g. 3:2 = 1.5).

        Ref:
        <http://www.imagemagick.org/script/command-line-processing.php#geome
        try>

    *   size* => *str*

        Image/video size, in <width>x<height> format, e.g. 2592x1944.

    Returns an enveloped result (an array).

    First element (status) is an integer containing HTTP status code (200
    means OK, 4xx caller error, 5xx function error). Second element (msg) is
    a string containing error message, or 'OK' if status is 200. Third
    element (payload) is optional, the actual result. Fourth element (meta)
    is called result metadata and is optional, a hash that contains extra
    information.

    Return value: (any)

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Math-Image-CalcResized>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Math-Image-CalcResized>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Math-Image-CalcResize
    d>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2020 by perlancar@cpan.org.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.

