18 	if ( ! property_exists( $block_type, 'supports' ) ) {

    19 	if ( ! ( $block_type instanceof WP_Block_Type ) ) {

    22 	$typography_supports = _wp_array_get( $block_type->supports, array( 'typography' ), false );

    23 	$typography_supports = isset( $block_type->supports['typography'] ) ? $block_type->supports['typography'] : false;

    27 	$has_font_family_support     = _wp_array_get( $typography_supports, array( '__experimentalFontFamily' ), false );

    28 	$has_font_family_support     = isset( $typography_supports['__experimentalFontFamily'] ) ? $typography_supports['__experimentalFontFamily'] : false;

    28 	$has_font_size_support       = _wp_array_get( $typography_supports, array( 'fontSize' ), false );

    29 	$has_font_size_support       = isset( $typography_supports['fontSize'] ) ? $typography_supports['fontSize'] : false;

    29 	$has_font_style_support      = _wp_array_get( $typography_supports, array( '__experimentalFontStyle' ), false );

    30 	$has_font_style_support      = isset( $typography_supports['__experimentalFontStyle'] ) ? $typography_supports['__experimentalFontStyle'] : false;

    30 	$has_font_weight_support     = _wp_array_get( $typography_supports, array( '__experimentalFontWeight' ), false );

    31 	$has_font_weight_support     = isset( $typography_supports['__experimentalFontWeight'] ) ? $typography_supports['__experimentalFontWeight'] : false;

    31 	$has_letter_spacing_support  = _wp_array_get( $typography_supports, array( '__experimentalLetterSpacing' ), false );

    32 	$has_letter_spacing_support  = isset( $typography_supports['__experimentalLetterSpacing'] ) ? $typography_supports['__experimentalLetterSpacing'] : false;

    32 	$has_line_height_support     = _wp_array_get( $typography_supports, array( 'lineHeight' ), false );

    33 	$has_line_height_support     = isset( $typography_supports['lineHeight'] ) ? $typography_supports['lineHeight'] : false;

    33 	$has_text_decoration_support = _wp_array_get( $typography_supports, array( '__experimentalTextDecoration' ), false );

    34 	$has_text_align_support      = isset( $typography_supports['textAlign'] ) ? $typography_supports['textAlign'] : false;

    34 	$has_text_transform_support  = _wp_array_get( $typography_supports, array( '__experimentalTextTransform' ), false );

    35 	$has_text_columns_support    = isset( $typography_supports['textColumns'] ) ? $typography_supports['textColumns'] : false;

    36 	$has_text_decoration_support = isset( $typography_supports['__experimentalTextDecoration'] ) ? $typography_supports['__experimentalTextDecoration'] : false;

    37 	$has_text_transform_support  = isset( $typography_supports['__experimentalTextTransform'] ) ? $typography_supports['__experimentalTextTransform'] : false;

    38 	$has_writing_mode_support    = isset( $typography_supports['__experimentalWritingMode'] ) ? $typography_supports['__experimentalWritingMode'] : false;

    43 		|| $has_text_transform_support;

    49 		|| $has_text_transform_support

    50 		|| $has_writing_mode_support;

    75 	if ( ! property_exists( $block_type, 'supports' ) ) {

    90 	if ( ! ( $block_type instanceof WP_Block_Type ) ) {

    79 	$typography_supports = _wp_array_get( $block_type->supports, array( 'typography' ), false );

    94 	$typography_supports = isset( $block_type->supports['typography'] )

    95 		? $block_type->supports['typography']

    96 		: false;

    89 	$classes    = array();

   238 	$classnames = array();

    90 	$styles     = array();

   239 	$styles     = wp_style_engine_get_styles(

    91 

   240 		array( 'typography' => $typography_block_styles ),

    92 	$has_font_family_support     = _wp_array_get( $typography_supports, array( '__experimentalFontFamily' ), false );

   241 		array( 'convert_vars_to_classnames' => true )

    93 	$has_font_size_support       = _wp_array_get( $typography_supports, array( 'fontSize' ), false );

   242 	);

    94 	$has_font_style_support      = _wp_array_get( $typography_supports, array( '__experimentalFontStyle' ), false );

   243 

    95 	$has_font_weight_support     = _wp_array_get( $typography_supports, array( '__experimentalFontWeight' ), false );

   244 	if ( ! empty( $styles['classnames'] ) ) {

    96 	$has_letter_spacing_support  = _wp_array_get( $typography_supports, array( '__experimentalLetterSpacing' ), false );

   245 		$classnames[] = $styles['classnames'];

    97 	$has_line_height_support     = _wp_array_get( $typography_supports, array( 'lineHeight' ), false );

   246 	}

    98 	$has_text_decoration_support = _wp_array_get( $typography_supports, array( '__experimentalTextDecoration' ), false );

   247 

    99 	$has_text_transform_support  = _wp_array_get( $typography_supports, array( '__experimentalTextTransform' ), false );

   248 	if ( $has_text_align_support && ! $should_skip_text_align && isset( $block_attributes['style']['typography']['textAlign'] ) ) {

   100 

   249 		$classnames[] = 'has-text-align-' . $block_attributes['style']['typography']['textAlign'];

   101 	if ( $has_font_size_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontSize' ) ) {

   250 	}

   102 		$has_named_font_size  = array_key_exists( 'fontSize', $block_attributes );

   251 

   103 		$has_custom_font_size = isset( $block_attributes['style']['typography']['fontSize'] );

   252 	if ( ! empty( $classnames ) ) {

   104 

   253 		$attributes['class'] = implode( ' ', $classnames );

   105 		if ( $has_named_font_size ) {

   254 	}

   106 			$classes[] = sprintf( 'has-%s-font-size', _wp_to_kebab_case( $block_attributes['fontSize'] ) );

   255 

   107 		} elseif ( $has_custom_font_size ) {

   256 	if ( ! empty( $styles['css'] ) ) {

   108 			$styles[] = sprintf( 'font-size: %s;', $block_attributes['style']['typography']['fontSize'] );

   257 		$attributes['style'] = $styles['css'];

   109 		}

   110 	}

   111 

   112 	if ( $has_font_family_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontFamily' ) ) {

   113 		$has_named_font_family  = array_key_exists( 'fontFamily', $block_attributes );

   114 		$has_custom_font_family = isset( $block_attributes['style']['typography']['fontFamily'] );

   115 

   116 		if ( $has_named_font_family ) {

   117 			$classes[] = sprintf( 'has-%s-font-family', _wp_to_kebab_case( $block_attributes['fontFamily'] ) );

   118 		} elseif ( $has_custom_font_family ) {

   119 			// Before using classes, the value was serialized as a CSS Custom Property.

   120 			// We don't need this code path when it lands in core.

   121 			$font_family_custom = $block_attributes['style']['typography']['fontFamily'];

   122 			if ( strpos( $font_family_custom, 'var:preset|font-family' ) !== false ) {

   123 				$index_to_splice    = strrpos( $font_family_custom, '|' ) + 1;

   124 				$font_family_slug   = _wp_to_kebab_case( substr( $font_family_custom, $index_to_splice ) );

   125 				$font_family_custom = sprintf( 'var(--wp--preset--font-family--%s)', $font_family_slug );

   126 			}

   127 			$styles[] = sprintf( 'font-family: %s;', $font_family_custom );

   128 		}

   129 	}

   130 

   131 	if ( $has_font_style_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontStyle' ) ) {

   132 		$font_style = wp_typography_get_css_variable_inline_style( $block_attributes, 'fontStyle', 'font-style' );

   133 		if ( $font_style ) {

   134 			$styles[] = $font_style;

   135 		}

   136 	}

   137 

   138 	if ( $has_font_weight_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'fontWeight' ) ) {

   139 		$font_weight = wp_typography_get_css_variable_inline_style( $block_attributes, 'fontWeight', 'font-weight' );

   140 		if ( $font_weight ) {

   141 			$styles[] = $font_weight;

   142 		}

   143 	}

   144 

   145 	if ( $has_line_height_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'lineHeight' ) ) {

   146 		$has_line_height = isset( $block_attributes['style']['typography']['lineHeight'] );

   147 		if ( $has_line_height ) {

   148 			$styles[] = sprintf( 'line-height: %s;', $block_attributes['style']['typography']['lineHeight'] );

   149 		}

   150 	}

   151 

   152 	if ( $has_text_decoration_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textDecoration' ) ) {

   153 		$text_decoration_style = wp_typography_get_css_variable_inline_style( $block_attributes, 'textDecoration', 'text-decoration' );

   154 		if ( $text_decoration_style ) {

   155 			$styles[] = $text_decoration_style;

   156 		}

   157 	}

   158 

   159 	if ( $has_text_transform_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'textTransform' ) ) {

   160 		$text_transform_style = wp_typography_get_css_variable_inline_style( $block_attributes, 'textTransform', 'text-transform' );

   161 		if ( $text_transform_style ) {

   162 			$styles[] = $text_transform_style;

   163 		}

   164 	}

   165 

   166 	if ( $has_letter_spacing_support && ! wp_should_skip_block_supports_serialization( $block_type, 'typography', 'letterSpacing' ) ) {

   167 		$letter_spacing_style = wp_typography_get_css_variable_inline_style( $block_attributes, 'letterSpacing', 'letter-spacing' );

   168 		if ( $letter_spacing_style ) {

   169 			$styles[] = $letter_spacing_style;

   170 		}

   171 	}

   172 

   173 	if ( ! empty( $classes ) ) {

   174 		$attributes['class'] = implode( ' ', $classes );

   175 	}

   176 	if ( ! empty( $styles ) ) {

   177 		$attributes['style'] = implode( ' ', $styles );

   184  * Generates an inline style for a typography feature e.g. text decoration,

   264  * Generates an inline style value for a typography feature e.g. text decoration,

   187  * @since 5.8.0

   267  * Note: This function is for backwards compatibility.

   268  * * It is necessary to parse older blocks whose typography styles contain presets.

   269  * * It mostly replaces the deprecated `wp_typography_get_css_variable_inline_style()`,

   270  *   but skips compiling a CSS declaration as the style engine takes over this role.

   271  * @link https://github.com/wordpress/gutenberg/pull/27555

   272  *

   273  * @since 6.1.0

   274  *

   275  * @param string $style_value  A raw style value for a single typography feature from a block's style attribute.

   276  * @param string $css_property Slug for the CSS property the inline style sets.

   277  * @return string A CSS inline style value.

   278  */

   279 function wp_typography_get_preset_inline_style_value( $style_value, $css_property ) {

   280 	// If the style value is not a preset CSS variable go no further.

   281 	if ( empty( $style_value ) || ! str_contains( $style_value, "var:preset|{$css_property}|" ) ) {

   282 		return $style_value;

   283 	}

   284 

   285 	/*

   286 	 * For backwards compatibility.

   287 	 * Presets were removed in WordPress/gutenberg#27555.

   288 	 * A preset CSS variable is the style.

   289 	 * Gets the style value from the string and return CSS style.

   290 	 */

   291 	$index_to_splice = strrpos( $style_value, '|' ) + 1;

   292 	$slug            = _wp_to_kebab_case( substr( $style_value, $index_to_splice ) );

   293 

   294 	// Return the actual CSS inline style value,

   295 	// e.g. `var(--wp--preset--text-decoration--underline);`.

   296 	return sprintf( 'var(--wp--preset--%s--%s);', $css_property, $slug );

   297 }

   298 

   299 /**

   300  * Renders typography styles/content to the block wrapper.

   301  *

   302  * @since 6.1.0

   303  *

   304  * @param string $block_content Rendered block content.

   305  * @param array  $block         Block object.

   306  * @return string Filtered block content.

   307  */

   308 function wp_render_typography_support( $block_content, $block ) {

   309 	if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {

   310 		return $block_content;

   311 	}

   312 

   313 	$custom_font_size = $block['attrs']['style']['typography']['fontSize'];

   314 	$fluid_font_size  = wp_get_typography_font_size_value( array( 'size' => $custom_font_size ) );

   315 

   316 	/*

   317 	 * Checks that $fluid_font_size does not match $custom_font_size,

   318 	 * which means it's been mutated by the fluid font size functions.

   319 	 */

   320 	if ( ! empty( $fluid_font_size ) && $fluid_font_size !== $custom_font_size ) {

   321 		// Replaces the first instance of `font-size:$custom_font_size` with `font-size:$fluid_font_size`.

   322 		return preg_replace( '/font-size\s*:\s*' . preg_quote( $custom_font_size, '/' ) . '\s*;?/', 'font-size:' . esc_attr( $fluid_font_size ) . ';', $block_content, 1 );

   323 	}

   324 

   325 	return $block_content;

   326 }

   327 

   328 /**

   329  * Checks a string for a unit and value and returns an array

   330  * consisting of `'value'` and `'unit'`, e.g. array( '42', 'rem' ).

   331  *

   332  * @since 6.1.0

   333  *

   334  * @param string|int|float $raw_value Raw size value from theme.json.

   335  * @param array            $options   {

   336  *     Optional. An associative array of options. Default is empty array.

   337  *

   338  *     @type string   $coerce_to        Coerce the value to rem or px. Default `'rem'`.

   339  *     @type int      $root_size_value  Value of root font size for rem|em <-> px conversion. Default `16`.

   340  *     @type string[] $acceptable_units An array of font size units. Default `array( 'rem', 'px', 'em' )`;

   341  * }

   342  * @return array|null An array consisting of `'value'` and `'unit'` properties on success.

   343  *                    `null` on failure.

   344  */

   345 function wp_get_typography_value_and_unit( $raw_value, $options = array() ) {

   346 	if ( ! is_string( $raw_value ) && ! is_int( $raw_value ) && ! is_float( $raw_value ) ) {

   347 		_doing_it_wrong(

   348 			__FUNCTION__,

   349 			__( 'Raw size value must be a string, integer, or float.' ),

   350 			'6.1.0'

   351 		);

   352 		return null;

   353 	}

   354 

   355 	if ( empty( $raw_value ) ) {

   356 		return null;

   357 	}

   358 

   359 	// Converts numbers to pixel values by default.

   360 	if ( is_numeric( $raw_value ) ) {

   361 		$raw_value = $raw_value . 'px';

   362 	}

   363 

   364 	$defaults = array(

   365 		'coerce_to'        => '',

   366 		'root_size_value'  => 16,

   367 		'acceptable_units' => array( 'rem', 'px', 'em' ),

   368 	);

   369 

   370 	$options = wp_parse_args( $options, $defaults );

   371 

   372 	$acceptable_units_group = implode( '|', $options['acceptable_units'] );

   373 	$pattern                = '/^(\d*\.?\d+)(' . $acceptable_units_group . '){1,1}$/';

   374 

   375 	preg_match( $pattern, $raw_value, $matches );

   376 

   377 	// Bails out if not a number value and a px or rem unit.

   378 	if ( ! isset( $matches[1] ) || ! isset( $matches[2] ) ) {

   379 		return null;

   380 	}

   381 

   382 	$value = $matches[1];

   383 	$unit  = $matches[2];

   384 

   385 	/*

   386 	 * Default browser font size. Later, possibly could inject some JS to

   387 	 * compute this `getComputedStyle( document.querySelector( "html" ) ).fontSize`.

   388 	 */

   389 	if ( 'px' === $options['coerce_to'] && ( 'em' === $unit || 'rem' === $unit ) ) {

   390 		$value = $value * $options['root_size_value'];

   391 		$unit  = $options['coerce_to'];

   392 	}

   393 

   394 	if ( 'px' === $unit && ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) ) {

   395 		$value = $value / $options['root_size_value'];

   396 		$unit  = $options['coerce_to'];

   397 	}

   398 

   399 	/*

   400 	 * No calculation is required if swapping between em and rem yet,

   401 	 * since we assume a root size value. Later we might like to differentiate between

   402 	 * :root font size (rem) and parent element font size (em) relativity.

   403 	 */

   404 	if ( ( 'em' === $options['coerce_to'] || 'rem' === $options['coerce_to'] ) && ( 'em' === $unit || 'rem' === $unit ) ) {

   405 		$unit = $options['coerce_to'];

   406 	}

   407 

   408 	return array(

   409 		'value' => round( $value, 3 ),

   410 		'unit'  => $unit,

   411 	);

   412 }

   413 

   414 /**

   415  * Internal implementation of CSS clamp() based on available min/max viewport

   416  * width and min/max font sizes.

   417  *

   418  * @since 6.1.0

   419  * @since 6.3.0 Checks for unsupported min/max viewport values that cause invalid clamp values.

   420  * @since 6.5.0 Returns early when min and max viewport subtraction is zero to avoid division by zero.

   190  * @param array  $attributes   Block's attributes.

   423  * @param array $args {

   191  * @param string $feature      Key for the feature within the typography styles.

   424  *     Optional. An associative array of values to calculate a fluid formula

   192  * @param string $css_property Slug for the CSS property the inline style sets.

   425  *     for font size. Default is empty array.

   193  * @return string CSS inline style.

   426  *

   194  */

   427  *     @type string $maximum_viewport_width Maximum size up to which type will have fluidity.

   195 function wp_typography_get_css_variable_inline_style( $attributes, $feature, $css_property ) {

   428  *     @type string $minimum_viewport_width Minimum viewport size from which type will have fluidity.

   196 	// Retrieve current attribute value or skip if not found.

   429  *     @type string $maximum_font_size      Maximum font size for any clamp() calculation.

   197 	$style_value = _wp_array_get( $attributes, array( 'style', 'typography', $feature ), false );

   430  *     @type string $minimum_font_size      Minimum font size for any clamp() calculation.

   198 	if ( ! $style_value ) {

   431  *     @type int    $scale_factor           A scale factor to determine how fast a font scales within boundaries.

   199 		return;

   432  * }

   200 	}

   433  * @return string|null A font-size value using clamp() on success, otherwise null.

   201 

   434  */

   202 	// If we don't have a preset CSS variable, we'll assume it's a regular CSS value.

   435 function wp_get_computed_fluid_typography_value( $args = array() ) {

   203 	if ( strpos( $style_value, "var:preset|{$css_property}|" ) === false ) {

   436 	$maximum_viewport_width_raw = isset( $args['maximum_viewport_width'] ) ? $args['maximum_viewport_width'] : null;

   204 		return sprintf( '%s:%s;', $css_property, $style_value );

   437 	$minimum_viewport_width_raw = isset( $args['minimum_viewport_width'] ) ? $args['minimum_viewport_width'] : null;

   205 	}

   438 	$maximum_font_size_raw      = isset( $args['maximum_font_size'] ) ? $args['maximum_font_size'] : null;

   206 

   439 	$minimum_font_size_raw      = isset( $args['minimum_font_size'] ) ? $args['minimum_font_size'] : null;

   207 	// We have a preset CSS variable as the style.

   440 	$scale_factor               = isset( $args['scale_factor'] ) ? $args['scale_factor'] : null;

   208 	// Get the style value from the string and return CSS style.

   441 

   209 	$index_to_splice = strrpos( $style_value, '|' ) + 1;

   442 	// Normalizes the minimum font size in order to use the value for calculations.

   210 	$slug            = substr( $style_value, $index_to_splice );

   443 	$minimum_font_size = wp_get_typography_value_and_unit( $minimum_font_size_raw );

   211 

   444 

   212 	// Return the actual CSS inline style e.g. `text-decoration:var(--wp--preset--text-decoration--underline);`.

   445 	/*

   213 	return sprintf( '%s:var(--wp--preset--%s--%s);', $css_property, $css_property, $slug );

   446 	 * We get a 'preferred' unit to keep units consistent when calculating,

   447 	 * otherwise the result will not be accurate.

   448 	 */

   449 	$font_size_unit = isset( $minimum_font_size['unit'] ) ? $minimum_font_size['unit'] : 'rem';

   450 

   451 	// Normalizes the maximum font size in order to use the value for calculations.

   452 	$maximum_font_size = wp_get_typography_value_and_unit(

   453 		$maximum_font_size_raw,

   454 		array(

   455 			'coerce_to' => $font_size_unit,

   456 		)

   457 	);

   458 

   459 	// Checks for mandatory min and max sizes, and protects against unsupported units.

   460 	if ( ! $maximum_font_size || ! $minimum_font_size ) {

   461 		return null;

   462 	}

   463 

   464 	// Uses rem for accessible fluid target font scaling.

   465 	$minimum_font_size_rem = wp_get_typography_value_and_unit(

   466 		$minimum_font_size_raw,

   467 		array(

   468 			'coerce_to' => 'rem',

   469 		)

   470 	);

   471 

   472 	// Viewport widths defined for fluid typography. Normalize units.

   473 	$maximum_viewport_width = wp_get_typography_value_and_unit(

   474 		$maximum_viewport_width_raw,

   475 		array(

   476 			'coerce_to' => $font_size_unit,

   477 		)

   478 	);

   479 	$minimum_viewport_width = wp_get_typography_value_and_unit(

   480 		$minimum_viewport_width_raw,

   481 		array(

   482 			'coerce_to' => $font_size_unit,

   483 		)

   484 	);

   485 

   486 	// Protects against unsupported units in min and max viewport widths.

   487 	if ( ! $minimum_viewport_width || ! $maximum_viewport_width ) {

   488 		return null;

   489 	}

   490 

   491 	// Calculates the linear factor denominator. If it's 0, we cannot calculate a fluid value.

   492 	$linear_factor_denominator = $maximum_viewport_width['value'] - $minimum_viewport_width['value'];

   493 	if ( empty( $linear_factor_denominator ) ) {

   494 		return null;

   495 	}

   496 

   497 	/*

   498 	 * Build CSS rule.

   499 	 * Borrowed from https://websemantics.uk/tools/responsive-font-calculator/.

   500 	 */

   501 	$view_port_width_offset = round( $minimum_viewport_width['value'] / 100, 3 ) . $font_size_unit;

   502 	$linear_factor          = 100 * ( ( $maximum_font_size['value'] - $minimum_font_size['value'] ) / ( $linear_factor_denominator ) );

   503 	$linear_factor_scaled   = round( $linear_factor * $scale_factor, 3 );

   504 	$linear_factor_scaled   = empty( $linear_factor_scaled ) ? 1 : $linear_factor_scaled;

   505 	$fluid_target_font_size = implode( '', $minimum_font_size_rem ) . " + ((1vw - $view_port_width_offset) * $linear_factor_scaled)";

   506 

   507 	return "clamp($minimum_font_size_raw, $fluid_target_font_size, $maximum_font_size_raw)";

   508 }

   509 

   510 /**

   511  * Returns a font-size value based on a given font-size preset.

   512  * Takes into account fluid typography parameters and attempts to return a CSS

   513  * formula depending on available, valid values.

   514  *

   515  * @since 6.1.0

   516  * @since 6.1.1 Adjusted rules for min and max font sizes.

   517  * @since 6.2.0 Added 'settings.typography.fluid.minFontSize' support.

   518  * @since 6.3.0 Using layout.wideSize as max viewport width, and logarithmic scale factor to calculate minimum font scale.

   519  * @since 6.4.0 Added configurable min and max viewport width values to the typography.fluid theme.json schema.

   520  * @since 6.6.0 Deprecated bool argument $should_use_fluid_typography.

   521  *

   522  * @param array      $preset   {

   523  *     Required. fontSizes preset value as seen in theme.json.

   524  *

   525  *     @type string           $name Name of the font size preset.

   526  *     @type string           $slug Kebab-case, unique identifier for the font size preset.

   527  *     @type string|int|float $size CSS font-size value, including units if applicable.

   528  * }

   529  * @param bool|array $settings Optional Theme JSON settings array that overrides any global theme settings.

   530  *                             Default is false.

   531  * @return string|null Font-size value or null if a size is not passed in $preset.

   532  */

   533 

   534 

   535 function wp_get_typography_font_size_value( $preset, $settings = array() ) {

   536 	if ( ! isset( $preset['size'] ) ) {

   537 		return null;

   538 	}

   539 

   540 	/*

   541 	 * Catches empty values and 0/'0'.

   542 	 * Fluid calculations cannot be performed on 0.

   543 	 */

   544 	if ( empty( $preset['size'] ) ) {

   545 		return $preset['size'];

   546 	}

   547 

   548 	/*

   549 	 * As a boolean (deprecated since 6.6), $settings acts as an override to switch fluid typography "on" (`true`) or "off" (`false`).

   550 	 */

   551 	if ( is_bool( $settings ) ) {

   552 		_deprecated_argument( __FUNCTION__, '6.6.0', __( '`boolean` type for second argument `$settings` is deprecated. Use `array()` instead.' ) );

   553 		$settings = array(

   554 			'typography' => array(

   555 				'fluid' => $settings,

   556 			),

   557 		);

   558 	}

   559 

   560 	// Fallback to global settings as default.

   561 	$global_settings = wp_get_global_settings();

   562 	$settings        = wp_parse_args(

   563 		$settings,

   564 		$global_settings

   565 	);

   566 

   567 	$typography_settings         = isset( $settings['typography'] ) ? $settings['typography'] : array();

   568 	$should_use_fluid_typography = ! empty( $typography_settings['fluid'] );

   569 

   570 	if ( ! $should_use_fluid_typography ) {

   571 		return $preset['size'];

   572 	}

   573 

   574 	// $typography_settings['fluid'] can be a bool or an array. Normalize to array.

   575 	$fluid_settings  = is_array( $typography_settings['fluid'] ) ? $typography_settings['fluid'] : array();

   576 	$layout_settings = isset( $settings['layout'] ) ? $settings['layout'] : array();

   577 

   578 	// Defaults.

   579 	$default_maximum_viewport_width       = '1600px';

   580 	$default_minimum_viewport_width       = '320px';

   581 	$default_minimum_font_size_factor_max = 0.75;

   582 	$default_minimum_font_size_factor_min = 0.25;

   583 	$default_scale_factor                 = 1;

   584 	$default_minimum_font_size_limit      = '14px';

   585 

   586 	// Defaults overrides.

   587 	$minimum_viewport_width = isset( $fluid_settings['minViewportWidth'] ) ? $fluid_settings['minViewportWidth'] : $default_minimum_viewport_width;

   588 	$maximum_viewport_width = isset( $layout_settings['wideSize'] ) && ! empty( wp_get_typography_value_and_unit( $layout_settings['wideSize'] ) ) ? $layout_settings['wideSize'] : $default_maximum_viewport_width;

   589 	if ( isset( $fluid_settings['maxViewportWidth'] ) ) {

   590 		$maximum_viewport_width = $fluid_settings['maxViewportWidth'];

   591 	}

   592 	$has_min_font_size       = isset( $fluid_settings['minFontSize'] ) && ! empty( wp_get_typography_value_and_unit( $fluid_settings['minFontSize'] ) );

   593 	$minimum_font_size_limit = $has_min_font_size ? $fluid_settings['minFontSize'] : $default_minimum_font_size_limit;

   594 

   595 	// Font sizes.

   596 	$fluid_font_size_settings = isset( $preset['fluid'] ) ? $preset['fluid'] : null;

   597 

   598 	// A font size has explicitly bypassed fluid calculations.

   599 	if ( false === $fluid_font_size_settings ) {

   600 		return $preset['size'];

   601 	}

   602 

   603 	// Try to grab explicit min and max fluid font sizes.

   604 	$minimum_font_size_raw = isset( $fluid_font_size_settings['min'] ) ? $fluid_font_size_settings['min'] : null;

   605 	$maximum_font_size_raw = isset( $fluid_font_size_settings['max'] ) ? $fluid_font_size_settings['max'] : null;

   606 

   607 	// Font sizes.

   608 	$preferred_size = wp_get_typography_value_and_unit( $preset['size'] );

   609 

   610 	// Protects against unsupported units.

   611 	if ( empty( $preferred_size['unit'] ) ) {

   612 		return $preset['size'];

   613 	}

   614 

   615 	/*

   616 	 * Normalizes the minimum font size limit according to the incoming unit,

   617 	 * in order to perform comparative checks.

   618 	 */

   619 	$minimum_font_size_limit = wp_get_typography_value_and_unit(

   620 		$minimum_font_size_limit,

   621 		array(

   622 			'coerce_to' => $preferred_size['unit'],

   623 		)

   624 	);

   625 

   626 	// Don't enforce minimum font size if a font size has explicitly set a min and max value.

   627 	if ( ! empty( $minimum_font_size_limit ) && ( ! $minimum_font_size_raw && ! $maximum_font_size_raw ) ) {

   628 		/*

   629 		 * If a minimum size was not passed to this function

   630 		 * and the user-defined font size is lower than $minimum_font_size_limit,

   631 		 * do not calculate a fluid value.

   632 		 */

   633 		if ( $preferred_size['value'] <= $minimum_font_size_limit['value'] ) {

   634 			return $preset['size'];

   635 		}

   636 	}

   637 

   638 	// If no fluid max font size is available use the incoming value.

   639 	if ( ! $maximum_font_size_raw ) {

   640 		$maximum_font_size_raw = $preferred_size['value'] . $preferred_size['unit'];

   641 	}

   642 

   643 	/*

   644 	 * If no minimumFontSize is provided, create one using

   645 	 * the given font size multiplied by the min font size scale factor.

   646 	 */

   647 	if ( ! $minimum_font_size_raw ) {

   648 		$preferred_font_size_in_px = 'px' === $preferred_size['unit'] ? $preferred_size['value'] : $preferred_size['value'] * 16;

   649 

   650 		/*

   651 		 * The scale factor is a multiplier that affects how quickly the curve will move towards the minimum,

   652 		 * that is, how quickly the size factor reaches 0 given increasing font size values.

   653 		 * For a - b * log2(), lower values of b will make the curve move towards the minimum faster.

   654 		 * The scale factor is constrained between min and max values.

   655 		 */

   656 		$minimum_font_size_factor     = min( max( 1 - 0.075 * log( $preferred_font_size_in_px, 2 ), $default_minimum_font_size_factor_min ), $default_minimum_font_size_factor_max );

   657 		$calculated_minimum_font_size = round( $preferred_size['value'] * $minimum_font_size_factor, 3 );

   658 

   659 		// Only use calculated min font size if it's > $minimum_font_size_limit value.

   660 		if ( ! empty( $minimum_font_size_limit ) && $calculated_minimum_font_size <= $minimum_font_size_limit['value'] ) {

   661 			$minimum_font_size_raw = $minimum_font_size_limit['value'] . $minimum_font_size_limit['unit'];

   662 		} else {

   663 			$minimum_font_size_raw = $calculated_minimum_font_size . $preferred_size['unit'];

   664 		}

   665 	}

   666 

   667 	$fluid_font_size_value = wp_get_computed_fluid_typography_value(

   668 		array(

   669 			'minimum_viewport_width' => $minimum_viewport_width,

   670 			'maximum_viewport_width' => $maximum_viewport_width,

   671 			'minimum_font_size'      => $minimum_font_size_raw,

   672 			'maximum_font_size'      => $maximum_font_size_raw,

   673 			'scale_factor'           => $default_scale_factor,

   674 		)

   675 	);

   676 

   677 	if ( ! empty( $fluid_font_size_value ) ) {

   678 		return $fluid_font_size_value;

   679 	}

   680 

   681 	return $preset['size'];