Re: Re: Image size in pure perl

Image::Size requires Image::Magic which in its turn require the libmagic libraries so this is not a pure Perl solution, nor is it nearly as portable. You can depend on having pack and unpack

cheers

tachyon

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Comment on Re: Re: Image size in pure perl

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Re: Re: Re: Image size in pure perl
by PodMaster (Abbot) on Mar 07, 2003 at 07:21 UTC

Recognized Formats Image::Size natively understands and sizes data in the following formats:
GIF JPG XBM XPM PPM family (PPM/PGM/PBM) XV thumbnails PNG MNG TIF BMP PSD (Adobe PhotoShop) SWF (ShockWave/Flash) PCD (Kodak PhotoCD, see notes below)
Additionally, if the Image::Magick module is present, the file types supported by it are also supported by Image::Size. See also "CAVEATS".

PodMaster

# NOTE: Derived from blib\lib\Image\Size.pm.
# Changes made here will be lost when autosplit is run again.
# See AutoSplit.pm.
package Image::Size;

#line 741 "blib\lib\Image\Size.pm (autosplit into blib\lib\auto\Image\
+Size\pngsize.al)"
# pngsize : gets the width & height (in pixels) of a png file
# cor this program is on the cutting edge of technology! (pity it's bl
+unt!)
#
# Re-written and tested by tmetro@vl.com
sub pngsize
{
    my $stream = shift;

    my ($x, $y, $id) = (undef, undef, "could not determine PNG size");
    my ($offset, $length);

    # Offset to first Chunk Type code = 8-byte ident + 4-byte chunk le
+ngth + 1
    $offset = 12; $length = 4;
    if (&$read_in($stream, $length, $offset) eq 'IHDR')
    {
        # IHDR = Image Header
        $length = 8;
        ($x, $y) = unpack("NN", &$read_in($stream, $length));
        $id = 'PNG';
    }

    ($x, $y, $id);
}

# end of Image::Size::pngsize
1;
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