🚿 mask pattern cleanup

src/Decoder/BitMatrix.php

@@ -182,23 +182,15 @@ final class BitMatrix{
 	}
 
 	/**
-	 * <p>Encapsulates data masks for the data bits in a QR code, per ISO 18004:2006 6.8. Implementations
-	 * of this class can un-mask a raw BitMatrix. For simplicity, they will unmask the entire BitMatrix,
-	 * including areas used for finder patterns, timing patterns, etc. These areas should be unused
-	 * after the point they are unmasked anyway.</p>
-	 *
-	 * <p>Note that the diagram in section 6.8.1 is misleading since it indicates that i is column position
-	 * and j is row position. In fact, as the text says, i is row position and j is column position.</p>
-	 *
-	 * <p>Implementations of this method reverse the data masking process applied to a QR Code and
-	 * make its bits ready to read.</p>
+	 * Implementations of this method reverse the data masking process applied to a QR Code and
+	 * make its bits ready to read.
 	 */
 	public function unmask(int $dimension, MaskPattern $maskPattern):void{
 		$mask = $maskPattern->getMask();
 
 		for($y = 0; $y < $dimension; $y++){
 			for($x = 0; $x < $dimension; $x++){
-				if($mask($x, $y) === 0){
+				if($mask($x, $y)){
 					$this->flip($x, $y);
 				}
 			}