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<title>[59145] trunk: Media: improve support for lossless WebP.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/59145">59145</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/59145","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>adamsilverstein</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-09-30 23:54:49 +0000 (Mon, 30 Sep 2024)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Media: improve support for lossless WebP.
When uploading lossless WebP images, WordPress now correctly outputs lossless WebP with both the Imagick and GD image editors.
Props: adamsilverstein, martinkrcho.
Fixes <a href="https://core.trac.wordpress.org/ticket/60291">#60291</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpimageeditorgdphp">trunk/src/wp-includes/class-wp-image-editor-gd.php</a></li>
<li><a href="#trunksrcwpincludesclasswpimageeditorimagickphp">trunk/src/wp-includes/class-wp-image-editor-imagick.php</a></li>
<li><a href="#trunktestsphpunittestsmediaphp">trunk/tests/phpunit/tests/media.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpimageeditorgdphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-image-editor-gd.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-image-editor-gd.php 2024-09-30 23:48:49 UTC (rev 59144)
+++ trunk/src/wp-includes/class-wp-image-editor-gd.php 2024-09-30 23:54:49 UTC (rev 59145)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -572,6 +572,38 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Sets Image Compression quality on a 1-100% scale. Handles WebP lossless images.
+ *
+ * @since 6.7.0
+ *
+ * @param int $quality Compression Quality. Range: [1,100]
+ * @return true|WP_Error True if set successfully; WP_Error on failure.
+ */
+ public function set_quality( $quality = null ) {
+ $quality_result = parent::set_quality( $quality );
+ if ( is_wp_error( $quality_result ) ) {
+ return $quality_result;
+ } else {
+ $quality = $this->get_quality();
+ }
+
+ // Handle setting the quality for WebP lossless images, see https://php.watch/versions/8.1/gd-webp-lossless.
+ try {
+ if ( 'image/webp' === $this->mime_type && defined( 'IMG_WEBP_LOSSLESS' ) ) {
+ $webp_info = wp_get_webp_info( $this->file );
+ if ( ! empty( $webp_info['type'] ) && 'lossless' === $webp_info['type'] ) {
+ $quality = IMG_WEBP_LOSSLESS;
+ parent::set_quality( $quality );
+ }
+ }
+ } catch ( Exception $e ) {
+ return new WP_Error( 'image_quality_error', $e->getMessage() );
+ }
+ $this->quality = $quality;
+ return true;
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Returns stream of current image.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.5.0
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpimageeditorimagickphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-image-editor-imagick.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-image-editor-imagick.php 2024-09-30 23:48:49 UTC (rev 59144)
+++ trunk/src/wp-includes/class-wp-image-editor-imagick.php 2024-09-30 23:54:49 UTC (rev 59145)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -215,6 +215,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // Use WebP lossless settings.
</span><span class="cx" style="display: block; padding: 0 10px"> $this->image->setImageCompressionQuality( 100 );
</span><span class="cx" style="display: block; padding: 0 10px"> $this->image->setOption( 'webp:lossless', 'true' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ parent::set_quality( 100 );
</ins><span class="cx" style="display: block; padding: 0 10px"> } else {
</span><span class="cx" style="display: block; padding: 0 10px"> $this->image->setImageCompressionQuality( $quality );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunktestsphpunittestsmediaphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/media.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/media.php 2024-09-30 23:48:49 UTC (rev 59144)
+++ trunk/tests/phpunit/tests/media.php 2024-09-30 23:54:49 UTC (rev 59145)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -6103,7 +6103,35 @@
</span><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
</ins><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Test WebP lossless quality is handled correctly.
+ *
+ * @ticket 60291
+ */
+ public function test_set_quality_webp_lossless() {
+ // Get a new editor to test that lossless WebP images are handled correctly.
+ $editor = wp_get_image_editor( DIR_TESTDATA . '/images/webp-lossless.webp' );
+
+ // If no editor is available, skip the test.
+ if ( is_wp_error( $editor ) ) {
+ $this->markTestSkipped( 'No editor available for lossless WebP images.' );
+ }
+
+ // Only test on GD when WebP lossless is supported.
+ if ( 'WP_Image_Editor_GD' === get_class( $editor ) && ! defined( 'IMG_WEBP_LOSSLESS' ) ) {
+ $this->markTestSkipped( 'No GD support available for lossless WebP images.' );
+ }
+
+ // Verify lossless quality is set correctly: IMG_WEBP_LOSSLESS for GD and 100 for Imagick.
+ if ( 'WP_Image_Editor_GD' === get_class( $editor ) ) {
+ $this->assertSame( IMG_WEBP_LOSSLESS, $editor->get_quality() );
+ } else {
+ $this->assertSame( 100, $editor->get_quality() );
+ }
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Test generated markup for an image with lazy loading gets auto-sizes.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @ticket 61847
</span></span></pre>
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