/* * Copyright 2012 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. */ @class ZXBitMatrix; /** * 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. * * 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. */ @interface ZXQRCodeDataMask : NSObject /** * Implementations of this method reverse the data masking process applied to a QR Code and * make its bits ready to read. * * @param bits representation of QR Code bits * @param dimension dimension of QR Code, represented by bits, being unmasked */ - (void)unmaskBitMatrix:(ZXBitMatrix *)bits dimension:(int)dimension; - (BOOL)isMasked:(int)i j:(int)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 */ + (ZXQRCodeDataMask *)forReference:(int)reference; @end