← All changes | class/class-mainwp-system-utility.php +144 -24 6.2 → 6.2.2 View file →

		@@ -30,8 +30,19 @@
30	30	*/
31	31	private static $instance = null;
32	32
33	33	/**
	34	+ * Request-local contrast results for tag backgrounds.
	35	+ *
	36	+ * Keyed by normalized #rrggbb. Invalid colors are not stored.
	37	+ *
	38	+ * @static
	39	+ *
	40	+ * @var array
	41	+ */
	42	+ private static $tag_contrast_cache = array();
	43	+
	44	+ /**
34	45	* Method instance()
35	46	*
36	47	* Create a public static instance.
37	48	*
		@@ -754,22 +765,14 @@
754	765	$tagx = MainWP_DB_Common::instance()->get_group_by_name( $tag );
755	766	$tagc = is_object( $tagx ) && '' !== $tagx->color ? $tagx->color : '';
756	767	}
757	768
758		- if ( '' !== $tagc ) {
759		- $tag_a_style = 'style="color:#fff!important;opacity:1;"';
760		- $tag_style = 'style="background-color:' . esc_html( $tagc ) . '"';
761		- } else {
762		- $tag_a_style = '';
763		- $tag_style = '';
	769	+ $tag_id = '';
	770	+ if ( isset( $tags_ids[ $idx ] ) && ! empty( $tags_ids[ $idx ] ) ) {
	771	+ $tag_id = $tags_ids[ $idx ];
764	772	}
765	773
766		- if ( isset( $tags_ids[ $idx ] ) && ! empty( $tags_ids[ $idx ] ) ) {
767		- $tag_id = $tags_ids[ $idx ];
768		- $tags_labels .= '<span ' . $tag_style . ' tag_id="' . $tag_id . '" class="ui tag mini label"><a ' . $tag_a_style . ' href="' . esc_url( $href . $tag_id ) . '">' . esc_html( $tag ) . '</a></span>';
769		- } else {
770		- $tags_labels .= '<span ' . $tag_style . ' class="ui tag mini label">' . esc_html( $tag ) . '</span>';
771		- }
	774	+ $tags_labels .= self::get_site_tag_label( $tag, $tag_id, $href, $tagc );
772	775	}
773	776	}
774	777	}
775	778	return $tags_labels;
		@@ -806,26 +809,143 @@
806	809	foreach ( $tags as $idx => $tag ) {
807	810	$tag = trim( $tag );
808	811	$tagc = $tags_colors[ $idx ];
809	812
810		- if ( '' !== $tagc ) {
811		- $tag_a_style = 'style="color:#fff!important;opacity:1;"';
812		- $tag_style = 'style="background-color:' . esc_html( $tagc ) . '"';
813		- } else {
814		- $tag_a_style = '';
815		- $tag_style = '';
	813	+ $tag_id = '';
	814	+ if ( isset( $tags_ids[ $idx ] ) && ! empty( $tags_ids[ $idx ] ) ) {
	815	+ $tag_id = $tags_ids[ $idx ];
816	816	}
817	817
818		- if ( isset( $tags_ids[ $idx ] ) && ! empty( $tags_ids[ $idx ] ) ) {
819		- $tag_id = $tags_ids[ $idx ];
820		- $tags_labels .= '<span ' . $tag_style . ' tag_id="' . $tag_id . '" class="ui tag mini label"><a ' . $tag_a_style . ' href="' . esc_url( $href . $tag_id ) . '">' . esc_html( $tag ) . '</a></span>';
821		- } else {
822		- $tags_labels .= '<span ' . $tag_style . ' class="ui tag mini label">' . esc_html( $tag ) . '</span>';
823		- }
	818	+ $tags_labels .= self::get_site_tag_label( $tag, $tag_id, $href, $tagc );
824	819	}
825	820	}
826	821	}
827	822	return $tags_labels;
	823	+ }
	824	+
	825	+ /**
	826	+ * Method get_tag_contrast_color()
	827	+ *
	828	+ * Pick white or black text for a tag background.
	829	+ * White is returned when its contrast is at least 4.5:1.
	830	+ *
	831	+ * @param string $background Stored tag color.
	832	+ *
	833	+ * @return string #ffffff, #000000, or an empty string when the color is unusable.
	834	+ */
	835	+ public static function get_tag_contrast_color( $background ) {
	836	+ $normalized = self::normalize_tag_color( $background );
	837	+ if ( '' === $normalized ) {
	838	+ return '';
	839	+ }
	840	+
	841	+ if ( isset( self::$tag_contrast_cache[ $normalized ] ) ) {
	842	+ return self::$tag_contrast_cache[ $normalized ];
	843	+ }
	844	+
	845	+ $white_contrast = 1.05 / ( self::tag_relative_luminance( $normalized ) + 0.05 );
	846	+ if ( $white_contrast >= 4.5 ) {
	847	+ $foreground = '#ffffff';
	848	+ } else {
	849	+ $foreground = '#000000';
	850	+ }
	851	+
	852	+ self::$tag_contrast_cache[ $normalized ] = $foreground;
	853	+ return $foreground;
	854	+ }
	855	+
	856	+ /**
	857	+ * Method normalize_tag_color()
	858	+ *
	859	+ * Reduce a stored tag color to lowercase #rrggbb.
	860	+ *
	861	+ * @param string $background Stored tag color.
	862	+ *
	863	+ * @return string Normalized color, or an empty string when it is not 3 or 6 digit hex.
	864	+ */
	865	+ private static function normalize_tag_color( $background ) {
	866	+ if ( ! is_string( $background ) ) {
	867	+ return '';
	868	+ }
	869	+
	870	+ $background = trim( $background );
	871	+ if ( ! preg_match( '/^#([0-9A-Fa-f]{3}|[0-9A-Fa-f]{6})$/', $background ) ) {
	872	+ return '';
	873	+ }
	874	+
	875	+ $background = strtolower( $background );
	876	+ if ( 4 === strlen( $background ) ) {
	877	+ $background = '#' . $background[1] . $background[1] . $background[2] . $background[2] . $background[3] . $background[3];
	878	+ }
	879	+
	880	+ return $background;
	881	+ }
	882	+
	883	+ /**
	884	+ * Method tag_relative_luminance()
	885	+ *
	886	+ * WCAG relative luminance for a normalized #rrggbb color.
	887	+ *
	888	+ * @param string $hex Normalized background.
	889	+ *
	890	+ * @return float Luminance between 0 and 1.
	891	+ */
	892	+ private static function tag_relative_luminance( $hex ) {
	893	+ $red = self::tag_channel_linear( hexdec( substr( $hex, 1, 2 ) ) / 255 );
	894	+ $green = self::tag_channel_linear( hexdec( substr( $hex, 3, 2 ) ) / 255 );
	895	+ $blue = self::tag_channel_linear( hexdec( substr( $hex, 5, 2 ) ) / 255 );
	896	+
	897	+ return ( 0.2126 * $red ) + ( 0.7152 * $green ) + ( 0.0722 * $blue );
	898	+ }
	899	+
	900	+ /**
	901	+ * Method tag_channel_linear()
	902	+ *
	903	+ * Convert an sRGB channel to linear light.
	904	+ *
	905	+ * @param float $channel Channel from 0 to 1.
	906	+ *
	907	+ * @return float Linear channel.
	908	+ */
	909	+ private static function tag_channel_linear( $channel ) {
	910	+ if ( $channel <= 0.04045 ) {
	911	+ return $channel / 12.92;
	912	+ }
	913	+
	914	+ return pow( ( $channel + 0.055 ) / 1.055, 2.4 );
	915	+ }
	916	+
	917	+ /**
	918	+ * Method get_site_tag_label()
	919	+ *
	920	+ * Build one tag chip for the linked and plain renderers.
	921	+ *
	922	+ * @param string $tag Tag name.
	923	+ * @param string $tag_id Tag id. An empty id renders a plain chip.
	924	+ * @param string $href Link prefix.
	925	+ * @param string $background Stored background color.
	926	+ *
	927	+ * @return string Chip HTML.
	928	+ */
	929	+ private static function get_site_tag_label( $tag, $tag_id, $href, $background ) {
	930	+ $foreground = static::get_tag_contrast_color( $background );
	931	+ $tag_style = '';
	932	+
	933	+ if ( '' !== $foreground ) {
	934	+ $normalized = self::normalize_tag_color( $background );
	935	+ $tag_style = 'style="background-color:' . esc_attr( $normalized ) . ';color:' . esc_attr( $foreground ) . '"';
	936	+ }
	937	+
	938	+ if ( ! empty( $tag_id ) ) {
	939	+ $tag_a_style = 'style="opacity:1;"';
	940	+ if ( '' !== $foreground ) {
	941	+ $tag_a_style = 'style="color:' . esc_attr( $foreground ) . '!important;opacity:1;"';
	942	+ }
	943	+
	944	+ return '<span ' . $tag_style . ' tag_id="' . esc_attr( $tag_id ) . '" class="ui tag mini label"><a ' . $tag_a_style . ' href="' . esc_url( $href . $tag_id ) . '">' . esc_html( $tag ) . '</a></span>';
	945	+ }
	946	+
	947	+ return '<span ' . $tag_style . ' class="ui tag mini label">' . esc_html( $tag ) . '</span>';
828	948	}
829	949
830	950	/**
831	951	* Filter client tags