[wp-trac] [WordPress Trac] #55443: Create WebP sub-sizes and use for output

[WordPress Trac]

#55443: Create WebP sub-sizes and use for output
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 Reporter:  adamsilverstein                      |       Owner:
                                                 |  adamsilverstein
     Type:  enhancement                          |      Status:  closed
 Priority:  normal                               |   Milestone:  6.1
Component:  Media                                |     Version:  6.0
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-unit-tests needs-dev-note        |     Focuses:
  needs-docs needs-user-docs has-patch commit    |  performance
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Comment (by flixos90):

 In [changeset:"54097" 54097]:
 {{{
 #!CommitTicketReference repository="" revision="54097"
 Media: Generate WebP only for certain registered image sizes.

 The existing filter `image_editor_output_format` receives an additional
 parameter `$size_name` which is populated whenever it controls the output
 format for a specific registered image size to create. Otherwise, it
 remains empty. In order to achieve this, a low level change has been added
 in bringing a new `$size_name` class property to the `WP_Image_Editor`
 base class, which is introduced in a backward compatible way that will not
 cause conflicts with custom implementations.

 This parameter is then used in new logic inside the
 `wp_default_image_output_mapping()` callback function for the filter,
 controlling whether `image/jpeg` should map to `image/webp` output or not.
 By default, this is enabled for all WordPress core image sizes by default,
 and this list can be modified using a new
 `wp_image_sizes_with_additional_mime_type_support` filter, e.g. to remove
 core sizes or add custom sizes.

 The customization per image size may be further enhanced by providing a
 more declarative API via a new parameter on the `add_image_size()`
 function.

 Props eugenemanuilov, flixos90, adamsilverstein, joegrainger.

 Fixes #56526.
 See #55443, #56288.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/55443#comment:195>
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