wp_render_background_support( string $block_content, array $block ): string

53function wp_render_background_support( $block_content, $block ) {54	$block_type                   = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );55	$block_attributes             = ( isset( $block['attrs'] ) && is_array( $block['attrs'] ) ) ? $block['attrs'] : array();56	$has_background_image_support = block_has_support( $block_type, array( 'background', 'backgroundImage' ), false );57 58	if (59		! $has_background_image_support ||60		wp_should_skip_block_supports_serialization( $block_type, 'background', 'backgroundImage' ) ||61		! isset( $block_attributes['style']['background'] )62	) {63		return $block_content;64	}65 66	$background_styles                         = array();67	$background_styles['backgroundImage']      = $block_attributes['style']['background']['backgroundImage'] ?? null;68	$background_styles['backgroundSize']       = $block_attributes['style']['background']['backgroundSize'] ?? null;69	$background_styles['backgroundPosition']   = $block_attributes['style']['background']['backgroundPosition'] ?? null;70	$background_styles['backgroundRepeat']     = $block_attributes['style']['background']['backgroundRepeat'] ?? null;71	$background_styles['backgroundAttachment'] = $block_attributes['style']['background']['backgroundAttachment'] ?? null;72 73	if ( ! empty( $background_styles['backgroundImage'] ) ) {74		$background_styles['backgroundSize'] = $background_styles['backgroundSize'] ?? 'cover';75 76		// If the background size is set to `contain` and no position is set, set the position to `center`.77		if ( 'contain' === $background_styles['backgroundSize'] && ! $background_styles['backgroundPosition'] ) {78			$background_styles['backgroundPosition'] = '50% 50%';79		}80	}81 82	$styles = wp_style_engine_get_styles( array( 'background' => $background_styles ) );83 84	if ( ! empty( $styles['css'] ) ) {85		// Inject background styles to the first element, presuming it's the wrapper, if it exists.86		$tags = new WP_HTML_Tag_Processor( $block_content );87 88		if ( $tags->next_tag() ) {89			$existing_style = $tags->get_attribute( 'style' );90			if ( is_string( $existing_style ) && '' !== $existing_style ) {91				$separator     = str_ends_with( $existing_style, ';' ) ? '' : ';';92				$updated_style = "{$existing_style}{$separator}{$styles['css']}";93			} else {94				$updated_style = $styles['css'];95			}96 97			$tags->set_attribute( 'style', $updated_style );98			$tags->add_class( 'has-background' );99		}100 101		return $tags->get_updated_html();102	}103 104	return $block_content;105}