From bd107ac6f67e7c1b7308a87e07310e404af598a1 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Sat, 7 Sep 2024 22:42:34 +0000
Subject: [PATCH] Administration: Remove old IE9 code from
 `wp-admin/js/svg-painter.js`.

About half of the file's code was a back-compat polyfill of base64 functions for IE9.

Since WordPress no longer supports IE9 as of version 4.8, and all modern browsers come with these functions, the polyfills can be removed.

Follow-up to [26072], [26131], [26601], [47771].

Props TobiasBg, sabernhardt.
Fixes #61995.

git-svn-id: https://develop.svn.wordpress.org/trunk@58997 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/js/_enqueues/wp/svg-painter.js | 123 ++---------------------------
 src/wp-admin/admin-header.php      |   2 +-
 2 files changed, 8 insertions(+), 117 deletions(-)

diff --git a/src/js/_enqueues/wp/svg-painter.js b/src/js/_enqueues/wp/svg-painter.js
index a3567354469f5..6a99d070d7717 100644
--- a/src/js/_enqueues/wp/svg-painter.js
+++ b/src/js/_enqueues/wp/svg-painter.js
@@ -8,123 +8,22 @@ window.wp = window.wp || {};
 
 wp.svgPainter = ( function( $, window, document, undefined ) {
 	'use strict';
-	var selector, base64, painter,
+	var selector, painter,
 		colorscheme = {},
 		elements = [];
 
 	$( function() {
-		// Detection for browser SVG capability.
-		if ( document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' ) ) {
-			$( document.body ).removeClass( 'no-svg' ).addClass( 'svg' );
-			wp.svgPainter.init();
-		}
+		wp.svgPainter.init();
 	});
 
-	/**
-	 * Needed only for IE9
-	 *
-	 * Based on jquery.base64.js 0.0.3 - https://github.com/yckart/jquery.base64.js
-	 *
-	 * Based on: https://gist.github.com/Yaffle/1284012
-	 *
-	 * Copyright (c) 2012 Yannick Albert (http://yckart.com)
-	 * Licensed under the MIT license
-	 * http://www.opensource.org/licenses/mit-license.php
-	 */
-	base64 = ( function() {
-		var c,
-			b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
-			a256 = '',
-			r64 = [256],
-			r256 = [256],
-			i = 0;
-
-		function init() {
-			while( i < 256 ) {
-				c = String.fromCharCode(i);
-				a256 += c;
-				r256[i] = i;
-				r64[i] = b64.indexOf(c);
-				++i;
-			}
-		}
-
-		function code( s, discard, alpha, beta, w1, w2 ) {
-			var tmp, length,
-				buffer = 0,
-				i = 0,
-				result = '',
-				bitsInBuffer = 0;
-
-			s = String(s);
-			length = s.length;
-
-			while( i < length ) {
-				c = s.charCodeAt(i);
-				c = c < 256 ? alpha[c] : -1;
-
-				buffer = ( buffer << w1 ) + c;
-				bitsInBuffer += w1;
-
-				while( bitsInBuffer >= w2 ) {
-					bitsInBuffer -= w2;
-					tmp = buffer >> bitsInBuffer;
-					result += beta.charAt(tmp);
-					buffer ^= tmp << bitsInBuffer;
-				}
-				++i;
-			}
-
-			if ( ! discard && bitsInBuffer > 0 ) {
-				result += beta.charAt( buffer << ( w2 - bitsInBuffer ) );
-			}
-
-			return result;
-		}
-
-		function btoa( plain ) {
-			if ( ! c ) {
-				init();
-			}
-
-			plain = code( plain, false, r256, b64, 8, 6 );
-			return plain + '===='.slice( ( plain.length % 4 ) || 4 );
-		}
-
-		function atob( coded ) {
-			var i;
-
-			if ( ! c ) {
-				init();
-			}
-
-			coded = coded.replace( /[^A-Za-z0-9\+\/\=]/g, '' );
-			coded = String(coded).split('=');
-			i = coded.length;
-
-			do {
-				--i;
-				coded[i] = code( coded[i], true, r64, a256, 6, 8 );
-			} while ( i > 0 );
-
-			coded = coded.join('');
-			return coded;
-		}
-
-		return {
-			atob: atob,
-			btoa: btoa
-		};
-	})();
-
 	return {
 		init: function() {
 			painter = this;
 			selector = $( '#adminmenu .wp-menu-image, #wpadminbar .ab-item' );
 
-			this.setColors();
-			this.findElements();
-			this.paint();
+			painter.setColors();
+			painter.findElements();
+			painter.paint();
 		},
 
 		setColors: function( colors ) {
@@ -201,11 +100,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 				}
 
 				try {
-					if ( 'atob' in window ) {
-						xml = window.atob( encoded[1] );
-					} else {
-						xml = base64.atob( encoded[1] );
-					}
+					xml = window.atob( encoded[1] );
 				} catch ( error ) {}
 
 				if ( xml ) {
@@ -218,11 +113,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 					// Replace `fill` properties in `<style>` tags.
 					xml = xml.replace( /fill:.*?;/g, 'fill: ' + color + ';');
 
-					if ( 'btoa' in window ) {
-						xml = window.btoa( xml );
-					} else {
-						xml = base64.btoa( xml );
-					}
+					xml = window.btoa( xml );
 
 					$element.data( 'wp-ui-svg-' + color, xml );
 				} else {
diff --git a/src/wp-admin/admin-header.php b/src/wp-admin/admin-header.php
index 53e3c06cfdf70..235468f1461c0 100644
--- a/src/wp-admin/admin-header.php
+++ b/src/wp-admin/admin-header.php
@@ -203,7 +203,7 @@
 	$admin_body_class .= ' network-admin';
 }
 
-$admin_body_class .= ' no-customize-support no-svg';
+$admin_body_class .= ' no-customize-support svg';
 
 if ( $current_screen->is_block_editor() ) {
 	$admin_body_class .= ' block-editor-page wp-embed-responsive';