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#66261: Media: Preserve AVIF sub-sizes when Imagick reports HEIC #14129

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#66261: Media: Preserve AVIF sub-sizes when Imagick reports HEIC #14129

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00d4187
Media: Preserve AVIF format when Imagick identifies it as HEIC
ArkaPrabhaChowdhury Oct 9, 2026
d4219b1
Tests: Check AVIF output selection without requiring encoding
ArkaPrabhaChowdhury Oct 9, 2026
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5 changes: 5 additions & 0 deletions src/wp-includes/class-wp-image-editor-imagick.php
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Original file line number Diff line number Diff line change
Expand Up @@ -373,6 +373,11 @@ public function load() {
}

$this->mime_type = $this->get_mime_type( $this->image->getImageFormat() );

// ImageMagick 6 can report an AVIF image as HEIC when using the libheif delegate.
if ( wp_is_heic_image_mime_type( $this->mime_type ) && 'image/avif' === wp_get_image_mime( $this->file ) ) {
$this->mime_type = 'image/avif';
}
} catch ( Exception $e ) {
return new WP_Error( 'invalid_image', $e->getMessage(), $this->file );
}
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23 changes: 23 additions & 0 deletions tests/phpunit/tests/image/editorImagick.php
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Expand Up @@ -45,6 +45,29 @@ public function test_supports_mime_type() {
$this->assertTrue( $imagick_image_editor->supports_mime_type( 'image/gif' ), 'Does not support image/gif' );
}

/**
* AVIF output should retain its format even when Imagick identifies the source as HEIC.
*
* @ticket 66261
*/
public function test_avif_output_format_retained() {
if ( ! WP_Image_Editor_Imagick::supports_mime_type( 'image/avif' ) ) {
$this->markTestSkipped( 'Imagick does not support AVIF.' );
}

$editor = new WP_Image_Editor_Imagick( DIR_TESTDATA . '/images/avif-lossy.avif' );
$this->assertTrue( $editor->load() );

$get_output_format = new ReflectionMethod( $editor, 'get_output_format' );
if ( PHP_VERSION_ID < 80100 ) {
$get_output_format->setAccessible( true );
}

list( , $extension, $mime_type ) = $get_output_format->invoke( $editor );
$this->assertSame( 'avif', $extension );
$this->assertSame( 'image/avif', $mime_type );
}

/**
* Tests resizing an image, not using crop.
*/
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