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- /*
- * DataMask.cpp
- * zxing
- *
- * Created by Christian Brunschen on 19/05/2008.
- * Copyright 2008 ZXing authors All rights reserved.
- *
- * 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.
- */
- #include <zxing/qrcode/decoder/DataMask.h>
- #include <zxing/common/IllegalArgumentException.h>
- namespace zxing {
- namespace qrcode {
- using namespace std;
- DataMask::DataMask() {
- }
- DataMask::~DataMask() {
- }
- vector<Ref<DataMask> > DataMask::DATA_MASKS;
- static int N_DATA_MASKS = DataMask::buildDataMasks();
- DataMask &DataMask::forReference(int reference) {
- if (reference < 0 || reference > 7) {
- throw IllegalArgumentException("reference must be between 0 and 7");
- }
- return *DATA_MASKS[reference];
- }
- void DataMask::unmaskBitMatrix(BitMatrix& bits, size_t dimension) {
- for (size_t y = 0; y < dimension; y++) {
- for (size_t x = 0; x < dimension; x++) {
- // TODO: check why the coordinates have to be swapped
- if (isMasked(y, x)) {
- bits.flip(x, y);
- }
- }
- }
- }
- /**
- * 000: mask bits for which (x + y) mod 2 == 0
- */
- class DataMask000 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- // return ((x + y) & 0x01) == 0;
- return ((x + y) % 2) == 0;
- }
- };
- /**
- * 001: mask bits for which x mod 2 == 0
- */
- class DataMask001 : public DataMask {
- public:
- bool isMasked(size_t x, size_t) {
- // return (x & 0x01) == 0;
- return (x % 2) == 0;
- }
- };
- /**
- * 010: mask bits for which y mod 3 == 0
- */
- class DataMask010 : public DataMask {
- public:
- bool isMasked(size_t, size_t y) {
- return y % 3 == 0;
- }
- };
- /**
- * 011: mask bits for which (x + y) mod 3 == 0
- */
- class DataMask011 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- return (x + y) % 3 == 0;
- }
- };
- /**
- * 100: mask bits for which (x/2 + y/3) mod 2 == 0
- */
- class DataMask100 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- // return (((x >> 1) + (y / 3)) & 0x01) == 0;
- return (((x >> 1) + (y / 3)) % 2) == 0;
- }
- };
- /**
- * 101: mask bits for which xy mod 2 + xy mod 3 == 0
- */
- class DataMask101 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- size_t temp = x * y;
- // return (temp & 0x01) + (temp % 3) == 0;
- return (temp % 2) + (temp % 3) == 0;
- }
- };
- /**
- * 110: mask bits for which (xy mod 2 + xy mod 3) mod 2 == 0
- */
- class DataMask110 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- size_t temp = x * y;
- // return (((temp & 0x01) + (temp % 3)) & 0x01) == 0;
- return (((temp % 2) + (temp % 3)) % 2) == 0;
- }
- };
- /**
- * 111: mask bits for which ((x+y)mod 2 + xy mod 3) mod 2 == 0
- */
- class DataMask111 : public DataMask {
- public:
- bool isMasked(size_t x, size_t y) {
- // return ((((x + y) & 0x01) + ((x * y) % 3)) & 0x01) == 0;
- return ((((x + y) % 2) + ((x * y) % 3)) % 2) == 0;
- }
- };
- int DataMask::buildDataMasks() {
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask000()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask001()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask010()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask011()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask100()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask101()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask110()));
- DATA_MASKS.push_back(Ref<DataMask> (new DataMask111()));
- return DATA_MASKS.size();
- }
- }
- }
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