try to fix too dark or bright themed icons

Signed-off-by: Simon L <[email protected]>

Author: szaimen

apps/theming/lib/IconBuilder.php

@@ -234,7 +234,14 @@ public function colorSvg($app, $image) {
 		}
 		$svg = file_get_contents($imageFile);
 		if ($svg !== false && $svg !== "") {
-			$color = $this->util->elementColor($this->themingDefaults->getColorPrimary());
+			$primaryColor = $this->themingDefaults->getColorPrimary();
+			$luminance = $this->util->calculateLuminance($primaryColor);
+			if ($luminance > 0.8) {
+				$isBrightColor = true;
+			} elseif ($luminance < 0.2) {
+				$isBrightColor = false;
+			}
+			$color = $this->util->elementColor($primaryColor, $isBrightColor);
 			$svg = $this->util->colorizeSvg($svg, $color);
 			return $svg;
 		} else {