[wp-trac] [WordPress Trac] #35725: Add WebP support.

[WordPress Trac]

#35725: Add WebP support.
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 Reporter:  markoheijnen                         |       Owner:
                                                 |  adamsilverstein
     Type:  enhancement                          |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.8
Component:  Media                                |     Version:  3.5
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing has-unit-    |     Focuses:
  tests needs-dev-note dev-feedback              |
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Comment (by adamsilverstein):

 [attachment:"35725.19.diff"] (and also on the PR):

 * Add `wp_get_webp_info` which gets a webp image width, height and type by
 reading the file headers.
 * Add `_wp_webp_is_lossy` which returns `true` if the file is a lossy WebP
 * In `src/wp-includes/class-wp-image-editor-imagick.php:set_quality` if
 the file is a WebP file, check if it is a lossless image (!lossy) and if
 so, ''set Imagick to use lossless output''.

 In addition to testing this manually it would be good to add an automated
 test that verifies it works as expected. Note: this only works for
 Imagick, with GD all uploaded WebP images will be converted to lossy image
 subsizes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35725#comment:150>
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