[wp-trac] [WordPress Trac] #60291: Support Lossless WebP in WP_Image_Editor_GD

[WordPress Trac]

#60291: Support Lossless WebP in WP_Image_Editor_GD
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 Reporter:  adamsilverstein  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Media            |    Version:  5.8
 Severity:  normal           |   Keywords:  needs-patch
  Focuses:                   |
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 While WordPress has supported WebP lossless since WebP support was
 introduced in WP 5.8
 (https://make.wordpress.org/core/2021/06/07/wordpress-5-8-adds-webp-
 support/) - outputting lossless sub-size image when you upload a lossless
 WebP - this only worked correctly when Imagick was installed as at the
 time lossless was not supported in PHP's bundled GD.

 PHP's bundled GD supports lossless output for WebP images since PHP 8.1,
 see see php.watch/versions/8.1/gd-webp-lossless.

 The capability to handle lossless WebPs can be detected in GD by the
 presence of the `IMG_WEBP_LOSSLESS` constant.

 To fix this - similar to Imagick, GD should output WebP lossless images
 when lossless WebP images are uploaded.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60291>
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