properly remove and replace favicon color when favicon gets manually removed/uploaded

classes/pref/feeds.php

@@ -464,6 +464,9 @@ class Pref_Feeds extends Handler_Protected {
 
 		if (db_num_rows($result) != 0) {
 			@unlink(ICONS_DIR . "/$feed_id.ico");
+
+			db_query($this->link, "UPDATE ttrss_feeds SET favicon_avg_color = NULL
+				where id = '$feed_id'");
 		}
 
 		return;
@@ -498,8 +501,19 @@ class Pref_Feeds extends Handler_Protected {
 
 				if (db_num_rows($result) != 0) {
 					@unlink(ICONS_DIR . "/$feed_id.ico");
-					rename($icon_file, ICONS_DIR . "/$feed_id.ico");
+					if (rename($icon_file, ICONS_DIR . "/$feed_id.ico")) {
+
+						require_once "colors.php";
+
+						$favicon_color = db_escape_string($this->link,
+							calculate_avg_color(ICONS_DIR . "/$feed_id.ico"));
+
+						db_query($this->link, "UPDATE ttrss_feeds SET
+							favicon_avg_color = '$favicon_color'
+							WHERE id = '$feed_id'");
+
 						$rc = 0;
+					}
 				} else {
 					$rc = 2;
 				}

include/colors.php

@@ -336,6 +336,6 @@ function hsl2rgb($arr) {
 				}
 			}
 		}
-		return false;
+		return '';
 	}
 ?>

include/rssfuncs.php

@@ -417,12 +417,11 @@
 						$favicon_color = db_escape_string($link,
 							calculate_avg_color($favicon_file));
 
-						 if ($debug_enabled) _debug("color: $favicon_color");
-
 						$favicon_colorstring = ",favicon_avg_color = '".$favicon_color."'";
 				}
 
-				db_query($link, "UPDATE ttrss_feeds SET favicon_last_checked = NOW() $favicon_colorstring
+				db_query($link, "UPDATE ttrss_feeds SET favicon_last_checked = NOW()
+					$favicon_colorstring
 					WHERE id = '$feed'");
 			}