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vendor/khanamiryan/qrcode-detector-decoder/lib/qrcode/decoder/DataMask.php

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+<?php
+/*
+ * Copyright 2007 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Zxing\Qrcode\Decoder;
+
+use Zxing\Common\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>
+ *
+ * @author Sean Owen
+ */
+abstract class DataMask
+{
+
+    /**
+     * See ISO 18004:2006 6.8.1
+     */
+    private static $DATA_MASKS = array();
+
+    static function Init()
+    {
+        self::$DATA_MASKS = array(
+            new DataMask000(),
+            new DataMask001(),
+            new DataMask010(),
+            new DataMask011(),
+            new DataMask100(),
+            new DataMask101(),
+            new DataMask110(),
+            new DataMask111(),
+        );
+    }
+
+    function __construct()
+    {
+
+    }
+
+    /**
+     * <p>Implementations of this method reverse the data masking process applied to a QR Code and
+     * make its bits ready to read.</p>
+     *
+     * @param bits representation of QR Code bits
+     * @param dimension dimension of QR Code, represented by bits, being unmasked
+     */
+    final function unmaskBitMatrix($bits, $dimension)
+    {
+        for ($i = 0; $i < $dimension; $i++) {
+            for ($j = 0; $j < $dimension; $j++) {
+                if ($this->isMasked($i, $j)) {
+                    $bits->flip($j, $i);
+                }
+            }
+        }
+    }
+
+    abstract function isMasked($i, $j);
+
+    /**
+     * @param reference a value between 0 and 7 indicating one of the eight possible
+     * data mask patterns a QR Code may use
+     * @return DataMask encapsulating the data mask pattern
+     */
+    static function forReference($reference)
+    {
+        if ($reference < 0 || $reference > 7) {
+            throw new \InvalidArgumentException();
+        }
+        return self::$DATA_MASKS[$reference];
+    }
+}
+DataMask::Init();
+/**
+ * 000: mask bits for which (x + y) mod 2 == 0
+ */
+final class DataMask000 extends DataMask {
+    // @Override
+    function isMasked($i, $j) {
+        return (($i + $j) & 0x01) == 0;
+    }
+}
+
+/**
+ * 001: mask bits for which x mod 2 == 0
+ */
+final class DataMask001 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        return ($i & 0x01) == 0;
+    }
+}
+
+/**
+ * 010: mask bits for which y mod 3 == 0
+ */
+final class DataMask010 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        return $j % 3 == 0;
+    }
+}
+
+/**
+ * 011: mask bits for which (x + y) mod 3 == 0
+ */
+final class DataMask011 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        return ($i + $j) % 3 == 0;
+    }
+}
+
+/**
+ * 100: mask bits for which (x/2 + y/3) mod 2 == 0
+ */
+final class DataMask100 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        return intval((intval($i / 2) + intval($j /3)) & 0x01) == 0;
+    }
+}
+
+/**
+ * 101: mask bits for which xy mod 2 + xy mod 3 == 0
+ */
+final class DataMask101 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        $temp = $i * $j;
+        return ($temp & 0x01) + ($temp % 3) == 0;
+    }
+}
+
+/**
+ * 110: mask bits for which (xy mod 2 + xy mod 3) mod 2 == 0
+ */
+final class DataMask110 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        $temp = $i * $j;
+        return ((($temp & 0x01) + ($temp % 3)) & 0x01) == 0;
+    }
+}
+
+/**
+ * 111: mask bits for which ((x+y)mod 2 + xy mod 3) mod 2 == 0
+ */
+final class DataMask111 extends DataMask {
+    //@Override
+    function isMasked($i, $j) {
+        return (((($i + $j) & 0x01) + (($i * $j) % 3)) & 0x01) == 0;
+    }
+}
+