[wp-trac] [WordPress Trac] #14459: Rotate Full Size Images on Upload

[WordPress Trac]

#14459: Rotate Full Size Images on Upload
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 Reporter:  mrroundhill                    |       Owner:  azaozz
     Type:  enhancement                    |      Status:  reviewing
 Priority:  normal                         |   Milestone:  Future Release
Component:  Upload                         |     Version:  3.0
 Severity:  normal                         |  Resolution:
 Keywords:  needs-patch westi-like mobile  |     Focuses:
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Comment (by n7studios):

 Patch:
 https://gist.github.com/n7studios/6a764d46bc1d515ba406

 I encountered this problem today, and built a small WordPress Plugin to
 resolve it which:
 1. Checks for the EXIF orientation flag, to see if the image needs
 rotating,
 2. Rotates the image, if required,
 3. Writes the EXIF and IPTC data from the original image to the modified,
 rotated version
 4. Sets the EXIF orientation flag to 1, to prevent applications which read
 the flag from rotating the image (which would result in over rotation)

 I appreciate there's still a lot of work to do, namely:
 1. Submitting this as an actual patch for WordPress core,
 2. Using the WP Filesystem for ovewriting the image file vs. fopen/fwrite
 wrappers
 3. I'm a bit dubious about line 140, as I think it'd potentially replace
 any 3, 6 or 8 value with 1 (potentially breaking other EXIF metadata -
 although in my tests, this didn't happen) - I struggled with hexadecimals:
 {{{#!php
 $exif_data = str_replace( chr( dechex( $original_orientation ) ) , chr(
 0x1 ), $exif_data );
 }}}

 This doesn't require any particular PHP extensions  / libraries, and most
 of the code is inspired by this ticket or submissions on php.net, which
 I've tried to credit where applicable.  The main thing is that EXIF / IPTC
 data is retained - this is typically lost when using GD to edit an image.

 Would be great to get some thoughts / feedback and see how this can be
 improved before submitting as a patch.

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Ticket URL: <https://core.trac.wordpress.org/ticket/14459#comment:34>
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