Ticket #32967: class-wp-site-icon.php

<?php

class WP_Site_Icon {
        private static $instance = null;

        /**
         * The minimum size of the site icon.
         *
         * @since 4.3.0
         *
         * @var int
         */
        public $min_size  = 512;

        /**
         *
         * @since 4.3.0
         *
         * @var array
         */
        public $site_icon_sizes = array(
                /**
                 * Square, medium sized tiles for IE11+.
                 *
                 * @link https://msdn.microsoft.com/library/dn455106(v=vs.85).aspx
                 */
                270,

                /**
                 * App icons up to iPhone 6 Plus.
                 *
                 * @link https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html
                 */
                180,

                // Our regular Favicon.
                32,
        );

        static function get_instance() {
                if ( is_null( self::$instance ) ) {
                        self::$instance = new WP_Site_Icon;
                }
                return self::$instance;
        }

        /**
         * Add Site Icon sizes to the array of image sizes on demand.
         *
         * @since 4.3.0
         *
         * @param array $sizes
         * @return array
         */
        public function intermediate_image_sizes( $sizes = array() ) {
                /** This filter is documented in wp-admin/includes/site-icon.php */
                $this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );
                foreach ( $this->site_icon_sizes as $size ) {
                        $sizes[] = 'site_icon-' . $size;
                }

                return $sizes;
        }

        /**
         * Add additional sizes to be made when creating the site_icon images.
         *
         * @since 4.3.0
         *
         * @param array $sizes
         * @return array
         */
        public function additional_sizes( $sizes = array() ) {
                $only_crop_sizes = array();

                /**
                 * Filter the different dimensions that a site icon is saved in.
                 *
                 * @since 4.3.0
                 *
                 * @param array $site_icon_sizes Sizes available for the Site Icon.
                 */
                $this->site_icon_sizes = apply_filters( 'site_icon_image_sizes', $this->site_icon_sizes );

                // Use a natural sort of numbers.
                natsort( $this->site_icon_sizes );
                $this->site_icon_sizes = array_reverse( $this->site_icon_sizes );

                // ensure that we only resize the image into
                foreach ( $sizes as $name => $size_array ) {
                        if ( $size_array['crop'] ) {
                                $only_crop_sizes[ $name ] = $size_array;
                        }
                }

                foreach ( $this->site_icon_sizes as $size ) {
                        if ( $size < $this->min_size ) {
                                $only_crop_sizes[ 'site_icon-' . $size ] = array(
                                        'width ' => $size,
                                        'height' => $size,
                                        'crop'   => true,
                                );
                        }
                }

                return $only_crop_sizes;
        }


}