),
				'b' => base_convert( $match[3] . $match[3], 16, 10 ),
			)
		);

		$rgb['a'] = 1;

		return $rgb;
	}

	/*
	 * The JS color picker considers the string "transparent" to be a hex value,
	 * so we need to handle it here as a special case.
	 */
	if ( 'transparent' === $color_str ) {
		return array(
			'r' => 0,
			'g' => 0,
			'b' => 0,
			'a' => 0,
		);
	}
}

/**
 * Returns the prefixed id for the duotone filter for use as a CSS id.
 *
 * @since 5.9.1
 * @deprecated 6.3.0
 *
 * @access private
 *
 * @param array $preset Duotone preset value as seen in theme.json.
 * @return string Duotone filter CSS id.
 */
function wp_get_duotone_filter_id( $preset ) {
	_deprecated_function( __FUNCTION__, '6.3.0' );
	return WP_Duotone::get_filter_id_from_preset( $preset );
}

/**
 * Returns the CSS filter property url to reference the rendered SVG.
 *
 * @since 5.9.0
 * @since 6.1.0 Allow unset for preset colors.
 * @deprecated 6.3.0
 *
 * @access private
 *
 * @param array $preset Duotone preset value as seen in theme.json.
 * @return string Duotone CSS filter property url value.
 */
function wp_get_duotone_filter_property( $preset ) {
	_deprecated_function( __FUNCTION__, '6.3.0' );
	return WP_Duotone::get_filter_css_property_value_from_preset( $preset );
}

/**
 * Returns the duotone filter SVG string for the preset.
 *
 * @since 5.9.1
 * @deprecated 6.3.0
 *
 * @access private
 *
 * @param array $preset Duotone preset value as seen in theme.json.
 * @return string Duotone SVG filter.
 */
function wp_get_duotone_filter_svg( $preset ) {
	_deprecated_function( __FUNCTION__, '6.3.0' );
	return WP_Duotone::get_filter_svg_from_preset( $preset );
}

/**
 * Registers the style and colors block attributes for block types that support it.
 *
 * @since 5.8.0
 * @deprecated 6.3.0 Use WP_Duotone::register_duotone_support() instead.
 *
 * @access private
 *
 * @param WP_Block_Type $block_type Block Type.
 */
function wp_register_duotone_support( $block_type ) {
	_deprecated_function( __FUNCTION__, '6.3.0', 'WP_Duotone::register_duotone_support()' );
	return WP_Duotone::register_duotone_support( $block_type );
}

/**
 * Renders out the duotone stylesheet and SVG.
 *
 * @since 5.8.0
 * @since 6.1.0 Allow unset for preset colors.
 * @deprecated 6.3.0 Use WP_Duotone::render_duotone_support() instead.
 *
 * @access private
 *
 * @param string $block_content Rendered block content.
 * @param array  $block         Block object.
 * @return string Filtered block content.
 */
function wp_render_duotone_support( $block_content, $block ) {
	_deprecated_function( __FUNCTION__, '6.3.0', 'WP_Duotone::render_duotone_support()' );
	$wp_block = new WP_Block( $block );
	return WP_Duotone::render_duotone_support( $block_content, $block, $wp_block );
}

/**
 * Returns a string containing the SVGs to be referenced as filters (duotone).
 *
 * @since 5.9.1
 * @deprecated 6.3.0 SVG generation is handled on a per-block basis in block supports.
 *
 * @return string
 */
function wp_get_global_styles_svg_filters() {
	_deprecated_function( __FUNCTION__, '6.3.0' );

	/*
	 * Ignore cache when the development mode is set to 'theme', so it doesn't interfere with the theme
	 * developer's workflow.
	 */
	$can_use_cached = ! wp_is_development_mode( 'theme' );
	$cache_group    = 'theme_json';
	$cache_key      = 'wp_get_global_styles_svg_filters';
	if ( $can_use_cached ) {
		$cached = wp_cache_get( $cache_key, $cache_group );
		if ( $cached ) {
			return $cached;
		}
	}

	$supports_theme_json = wp_theme_has_theme_json();

	$origins = array( 'default', 'theme', 'custom' );
	if ( ! $supports_theme_json ) {
		$origins = array( 'default' );
	}

	$tree = WP_Theme_JSON_Resolver::get_merged_data();
	$svgs = $tree->get_svg_filters( $origins );

	if ( $can_use_cached ) {
		wp_cache_set( $cache_key, $svgs, $cache_group );
	}

	return $svgs;
}

/**
 * Renders the SVG filters supplied by theme.json.
 *
 * Note that this doesn't render the per-block user-defined
 * filters which are handled by wp_render_duotone_support,
 * but it should be rendered before the filtered content
 * in the body to satisfy Safari's rendering quirks.
 *
 * @since 5.9.1
 * @deprecated 6.3.0 SVG generation is handled on a per-block basis in block supports.
 */
function wp_global_styles_render_svg_filters() {
	_deprecated_function( __FUNCTION__, '6.3.0' );

	/*
	 * When calling via the in_admin_header action, we only want to render the
	 * SVGs on block editor pages.
	 */
	if (
		is_admin() &&
		! get_current_screen()->is_block_editor()
	) {
		return;
	}

	$filters = wp_get_global_styles_svg_filters();
	if ( ! empty( $filters ) ) {
		echo $filters;
	}
}

/**
 * Build an array with CSS classes and inline styles defining the colors
 * which will be applied to the navigation markup in the front-end.
 *
 * @since 5.9.0
 * @deprecated 6.3.0 This was removed from the Navigation Submenu block in favour of `wp_apply_colors_support()`.
 *                   `wp_apply_colors_support()` returns an array with similar class and style values,
 *                   but with different keys: `class` and `style`.
 *
 * @param  array $context     Navigation block context.
 * @param  array $attributes  Block attributes.
 * @param  bool  $is_sub_menu Whether the block is a sub-menu.
 * @return array Colors CSS classes and inline styles.
 */
function block_core_navigation_submenu_build_css_colors( $context, $attributes, $is_sub_menu = false ) {
	_deprecated_function( __FUNCTION__, '6.3.0' );
	$colors = array(
		'css_classes'   => array(),
		'inline_styles' => '',
	);

	// Text color.
	$named_text_color  = null;
	$custom_text_color = null;

	if ( $is_sub_menu && array_key_exists( 'customOverlayTextColor', $context ) ) {
		$custom_text_color = $context['customOverlayTextColor'];
	} elseif ( $is_sub_menu && array_key_exists( 'overlayTextColor', $context ) ) {
		$named_text_color = $context['overlayTextColor'];
	} elseif ( array_key_exists( 'customTextColor', $context ) ) {
		$custom_text_color = $context['customTextColor'];
	} elseif ( array_key_exists( 'textColor', $context ) ) {
		$named_text_color = $context['textColor'];
	} elseif ( isset( $context['style']['color']['text'] ) ) {
		$custom_text_color = $context['style']['color']['text'];
	}

	// If has text color.
	if ( ! is_null( $named_text_color ) ) {
		// Add the color class.
		array_push( $colors['css_classes'], 'has-text-color', sprintf( 'has-%s-color', $named_text_color ) );
	} elseif ( ! is_null( $custom_text_color ) ) {
		// Add the custom color inline style.
		$colors['css_classes'][]  = 'has-text-color';
		$colors['inline_styles'] .= sprintf( 'color: %s;', $custom_text_color );
	}

	// Background color.
	$named_background_color  = null;
	$custom_background_color = null;

	if ( $is_sub_menu && array_key_exists( 'customOverlayBackgroundColor', $context ) ) {
		$custom_background_color = $context['customOverlayBackgroundColor'];
	} elseif ( $is_sub_menu && array_key_exists( 'overlayBackgroundColor', $context ) ) {
		$named_background_color = $context['overlayBackgroundColor'];
	} elseif ( array_key_exists( 'customBackgroundColor', $context ) ) {
		$custom_background_color = $context['customBackgroundColor'];
	} elseif ( array_key_exists( 'backgroundColor', $context ) ) {
		$named_background_color = $context['backgroundColor'];
	} elseif ( isset( $context['style']['color']['background'] ) ) {
		$custom_background_color = $context['style']['color']['background'];
	}

	// If has background color.
	if ( ! is_null( $named_background_color ) ) {
		// Add the background-color class.
		array_push( $colors['css_classes'], 'has-background', sprintf( 'has-%s-background-color', $named_background_color ) );
	} elseif ( ! is_null( $custom_background_color ) ) {
		// Add the custom background-color inline style.
		$colors['css_classes'][]  = 'has-background';
		$colors['inline_styles'] .= sprintf( 'background-color: %s;', $custom_background_color );
	}

	return $colors;
}