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<?php
/**
 * WordPress API for media display.
 *
 * @package WordPress
 * @subpackage Media
 */

/**
 * Retrieves additional image sizes.
 *
 * @since 4.7.0
 *
 * @global array $_wp_additional_image_sizes
 *
 * @return array Additional images size data.
 */
function wp_get_additional_image_sizes() {
	global $_wp_additional_image_sizes;

	if ( ! $_wp_additional_image_sizes ) {
		$_wp_additional_image_sizes = array();
	}

	return $_wp_additional_image_sizes;
}

/**
 * Scales down the default size of an image.
 *
 * This is so that the image is a better fit for the editor and theme.
 *
 * The `$size` parameter accepts either an array or a string. The supported string
 * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
 * 128 width and 96 height in pixels. Also supported for the string value is
 * 'medium', 'medium_large' and 'full'. The 'full' isn't actually supported, but any value other
 * than the supported will result in the content_width size or 500 if that is
 * not set.
 *
 * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be
 * called on the calculated array for width and height, respectively.
 *
 * @since 2.5.0
 *
 * @global int $content_width
 *
 * @param int          $width   Width of the image in pixels.
 * @param int          $height  Height of the image in pixels.
 * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array
 *                              of width and height values in pixels (in that order). Default 'medium'.
 * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
 *                              (like inserting into an editor). Default null.
 * @return int[] {
 *     An array of width and height values.
 *
 *     @type int $0 The maximum width in pixels.
 *     @type int $1 The maximum height in pixels.
 * }
 */
function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {
	global $content_width;

	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	if ( ! $context ) {
		$context = is_admin() ? 'edit' : 'display';
	}

	if ( is_array( $size ) ) {
		$max_width  = $size[0];
		$max_height = $size[1];
	} elseif ( 'thumb' === $size || 'thumbnail' === $size ) {
		$max_width  = (int) get_option( 'thumbnail_size_w' );
		$max_height = (int) get_option( 'thumbnail_size_h' );
		// Last chance thumbnail size defaults.
		if ( ! $max_width && ! $max_height ) {
			$max_width  = 128;
			$max_height = 96;
		}
	} elseif ( 'medium' === $size ) {
		$max_width  = (int) get_option( 'medium_size_w' );
		$max_height = (int) get_option( 'medium_size_h' );

	} elseif ( 'medium_large' === $size ) {
		$max_width  = (int) get_option( 'medium_large_size_w' );
		$max_height = (int) get_option( 'medium_large_size_h' );

		if ( (int) $content_width > 0 ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} elseif ( 'large' === $size ) {
		/*
		 * We're inserting a large size image into the editor. If it's a really
		 * big image we'll scale it down to fit reasonably within the editor
		 * itself, and within the theme's content width if it's known. The user
		 * can resize it in the editor if they wish.
		 */
		$max_width  = (int) get_option( 'large_size_w' );
		$max_height = (int) get_option( 'large_size_h' );

		if ( (int) $content_width > 0 ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} elseif ( ! empty( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ), true ) ) {
		$max_width  = (int) $_wp_additional_image_sizes[ $size ]['width'];
		$max_height = (int) $_wp_additional_image_sizes[ $size ]['height'];
		// Only in admin. Assume that theme authors know what they're doing.
		if ( (int) $content_width > 0 && 'edit' === $context ) {
			$max_width = min( (int) $content_width, $max_width );
		}
	} else { // $size === 'full' has no constraint.
		$max_width  = $width;
		$max_height = $height;
	}

	/**
	 * Filters the maximum image size dimensions for the editor.
	 *
	 * @since 2.