From 6279e627a36ac79e889b93f865c5beb9f49b6839 Mon Sep 17 00:00:00 2001
From: Karen Holland <karen@brickfieldlabs.ie>
Date: Wed, 31 Jul 2024 11:42:50 +0000
Subject: [PATCH] MDL-78785 tool_brickfield: Including rgba() processing

---
 .../brickfield_accessibility_color_test.php    | 18 ++++++++++++++----
 .../checks/css_text_has_contrast_test.php      |  4 ++--
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/admin/tool/brickfield/classes/local/htmlchecker/common/brickfield_accessibility_color_test.php b/admin/tool/brickfield/classes/local/htmlchecker/common/brickfield_accessibility_color_test.php
index 319864cb87f8c..f93e43e2abc86 100644
--- a/admin/tool/brickfield/classes/local/htmlchecker/common/brickfield_accessibility_color_test.php
+++ b/admin/tool/brickfield/classes/local/htmlchecker/common/brickfield_accessibility_color_test.php
@@ -245,7 +245,6 @@ public function luminosity(string $r, string $r2, string $g, string $g2, string
         return $luminosity;
     }
 
-
     /**
      * Returns the decimal equivalents for a HEX color. Returns null if it cannot be determined.
      * @param string $color The hex color value
@@ -304,9 +303,20 @@ public function convert_color(string $color): string {
         }
         // RGB values.
         if (strtolower(substr($color, 0, 3)) == 'rgb') {
-            $colors = explode(',', trim(str_replace('rgb(', '', $color), '()'));
-            if (count($colors) != 3) {
-                return false;
+            if (strpos($color, 'rgba') !== false) {
+                $tmpbg = $this->get_rgb($this->defaultbackground);
+                $colors = explode(',', trim(str_replace('rgba(', '', $color), '()'));
+                if (count($colors) != 4) {
+                    return false;
+                }
+                $colors[0] = round(((1 - $colors[3]) * $tmpbg['r']) + ($colors[3] * $colors[0]));
+                $colors[1] = round((1 - $colors[3]) * $tmpbg['g']) + ($colors[3] * $colors[1]);
+                $colors[2] = round((1 - $colors[3]) * $tmpbg['b']) + ($colors[3] * $colors[2]);
+            } else {
+                $colors = explode(',', trim(str_replace('rgb(', '', $color), '()'));
+                if (count($colors) != 3) {
+                    return false;
+                }
             }
             $r = intval($colors[0]);
             $g = intval($colors[1]);
diff --git a/admin/tool/brickfield/tests/local/htmlchecker/common/checks/css_text_has_contrast_test.php b/admin/tool/brickfield/tests/local/htmlchecker/common/checks/css_text_has_contrast_test.php
index 046483b12ba58..15c10e16e2151 100644
--- a/admin/tool/brickfield/tests/local/htmlchecker/common/checks/css_text_has_contrast_test.php
+++ b/admin/tool/brickfield/tests/local/htmlchecker/common/checks/css_text_has_contrast_test.php
@@ -348,7 +348,7 @@ public function test_check_for_largerbold_pass(): void {
         $this->assertEmpty($results);
     }
 
-        /**
+    /**
      * Test for rgb colors with insufficient contrast.
      */
     public function test_bad_rgbcolor() {
@@ -457,4 +457,4 @@ public function test_good_backgroundcssrgba() {
         $results = $this->get_checker_results($html);
         $this->assertEmpty($results);
     }
-}
\ No newline at end of file
+}