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package Imager::ExifOrientation; |
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use strict; |
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use warnings; |
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our $VERSION = '0.07'; |
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use Carp; |
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use Imager; |
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use Image::ExifTool 'ImageInfo'; |
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use Image::ExifTool::Exif; |
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my $orientation_revers = {}; |
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while (my($k, $v) = each %Image::ExifTool::Exif::orientation) { |
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$orientation_revers->{$v} = $k; |
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} |
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sub rotate { |
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my($class, %opts) = @_; |
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my $img = Imager->new; |
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my $exif; |
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if ($opts{data}) { |
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$exif = ImageInfo(\$opts{data}); |
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$img->read( data => $opts{data}, type => 'jpeg' ); |
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} elsif ($opts{path}) { |
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$exif = ImageInfo($opts{path}); |
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$img->read( file => $opts{path}, type => 'jpeg' ); |
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} else { |
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croak "usage: |
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Imager::ExifOrientation->rotate( path => '/foo/bar/baz.jpg' ) |
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Imager::ExifOrientation->rotate( data => \$jpeg_data ) |
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"; |
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} |
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my $orientation = $class->get_orientation_by_exiftool($exif || {}); |
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$class->_rotate($img, $orientation); |
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} |
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sub get_orientation_by_exiftool { |
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my($class, $exif) = @_; |
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return 1 unless $exif->{Orientation}; |
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return $orientation_revers->{$exif->{Orientation}} || 1; |
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} |
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my $rotate_maps = { |
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1 => { right => 0, mirror => undef }, # Horizontal (normal) |
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2 => { right => 0, mirror => 'h' }, # Mirror horizontal |
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3 => { right => 0, mirror => 'hv' }, # Rotate 180 (rotate is too noisy) |
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4 => { right => 0, mirror => 'v' }, # Mirror vertical |
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5 => { right => 270, mirror => 'h' }, # Mirror horizontal and rotate 270 CW |
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6 => { right => 90, mirror => undef }, # Rotate 90 CW |
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7 => { right => 90, mirror => 'h' }, # Mirror horizontal and rotate 90 CW |
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8 => { right => 270, mirror => undef }, # Rotate 270 CW |
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}; |
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sub _rotate { |
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my($class, $img, $orientation) = @_; |
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my $map = $rotate_maps->{$orientation}; |
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59
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100
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if ($map->{mirror}) { |
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10
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$img->flip( dir => $map->{mirror} ); |
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} |
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63
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16
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100
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if ($map->{right}) { |
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8
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return $img->rotate( right => $map->{right} ); |
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} |
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8
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$img; |
68
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} |
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1; |
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__END__ |