
wp-config.php文件——深入探讨如何配置WordPress
wp_get_duotone_filter_svg ( $preset )
wp_get_duotone_filter_svg: 这个函数返回用于在图像上产生双色调效果的双色调过滤器的SVG代码。它与wp_get_duotone_filter_id一起使用,以生成SVG过滤器。
返回预设的duotone过滤器SVG字符串。
function wp_get_duotone_filter_svg( $preset ) { $filter_id = wp_get_duotone_filter_id( $preset ); $duotone_values = array( 'r' => array(), 'g' => array(), 'b' => array(), 'a' => array(), ); if ( ! isset( $preset['colors'] ) || ! is_array( $preset['colors'] ) ) { $preset['colors'] = array(); } foreach ( $preset['colors'] as $color_str ) { $color = wp_tinycolor_string_to_rgb( $color_str ); $duotone_values['r'][] = $color['r'] / 255; $duotone_values['g'][] = $color['g'] / 255; $duotone_values['b'][] = $color['b'] / 255; $duotone_values['a'][] = $color['a']; } ob_start(); ?> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 0 0" width="0" height="0" focusable="false" role="none" style="visibility: hidden; position: absolute; left: -9999px; overflow: hidden;" > <defs> <filter id="<?php echo esc_attr( $filter_id ); ?>"> <feColorMatrix color-interpolation-filters="sRGB" type="matrix" values=" .299 .587 .114 0 0 .299 .587 .114 0 0 .299 .587 .114 0 0 .299 .587 .114 0 0 " /> <feComponentTransfer color-interpolation-filters="sRGB" > <feFuncR type="table" tableValues="<?php echo esc_attr( implode( ' ', $duotone_values['r'] ) ); ?>" /> <feFuncG type="table" tableValues="<?php echo esc_attr( implode( ' ', $duotone_values['g'] ) ); ?>" /> <feFuncB type="table" tableValues="<?php echo esc_attr( implode( ' ', $duotone_values['b'] ) ); ?>" /> <feFuncA type="table" tableValues="<?php echo esc_attr( implode( ' ', $duotone_values['a'] ) ); ?>" /> </feComponentTransfer> <feComposite in2="SourceGraphic" operator="in" /> </filter> </defs> </svg> <?php $svg = ob_get_clean(); if ( ! defined( 'SCRIPT_DEBUG' ) || ! SCRIPT_DEBUG ) { // Clean up the whitespace. $svg = preg_replace( "/[rnt ]+/", ' ', $svg ); $svg = str_replace( '> <', '><', $svg ); $svg = trim( $svg ); } return $svg; }