import BarcodeFormat from '../BarcodeFormat';
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import BitMatrix from '../common/BitMatrix';
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import DecodeHintType from '../DecodeHintType';
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import NotFoundException from '../NotFoundException';
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import Result from '../Result';
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import ResultMetadataType from '../ResultMetadataType';
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import System from '../util/System';
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import Decoder from './decoder/Decoder';
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import Detector from './detector/Detector';
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/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* This implementation can detect and decode Data Matrix codes in an image.
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*
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* @author bbrown@google.com (Brian Brown)
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*/
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export default class DataMatrixReader {
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constructor() {
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this.decoder = new Decoder();
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}
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/**
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* Locates and decodes a Data Matrix code in an image.
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*
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* @return a String representing the content encoded by the Data Matrix code
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* @throws NotFoundException if a Data Matrix code cannot be found
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* @throws FormatException if a Data Matrix code cannot be decoded
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* @throws ChecksumException if error correction fails
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*/
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// @Override
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// public Result decode(BinaryBitmap image) throws NotFoundException, ChecksumException, FormatException {
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// return decode(image, null);
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// }
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// @Override
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decode(image, hints = null) {
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let decoderResult;
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let points;
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if (hints != null && hints.has(DecodeHintType.PURE_BARCODE)) {
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const bits = DataMatrixReader.extractPureBits(image.getBlackMatrix());
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decoderResult = this.decoder.decode(bits);
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points = DataMatrixReader.NO_POINTS;
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}
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else {
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const detectorResult = new Detector(image.getBlackMatrix()).detect();
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decoderResult = this.decoder.decode(detectorResult.getBits());
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points = detectorResult.getPoints();
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}
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const rawBytes = decoderResult.getRawBytes();
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const result = new Result(decoderResult.getText(), rawBytes, 8 * rawBytes.length, points, BarcodeFormat.DATA_MATRIX, System.currentTimeMillis());
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const byteSegments = decoderResult.getByteSegments();
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if (byteSegments != null) {
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result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, byteSegments);
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}
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const ecLevel = decoderResult.getECLevel();
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if (ecLevel != null) {
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result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, ecLevel);
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}
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return result;
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}
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// @Override
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reset() {
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// do nothing
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}
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/**
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* This method detects a code in a "pure" image -- that is, pure monochrome image
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* which contains only an unrotated, unskewed, image of a code, with some white border
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* around it. This is a specialized method that works exceptionally fast in this special
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* case.
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*
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* @see com.google.zxing.qrcode.QRCodeReader#extractPureBits(BitMatrix)
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*/
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static extractPureBits(image) {
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const leftTopBlack = image.getTopLeftOnBit();
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const rightBottomBlack = image.getBottomRightOnBit();
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if (leftTopBlack == null || rightBottomBlack == null) {
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throw new NotFoundException();
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}
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const moduleSize = this.moduleSize(leftTopBlack, image);
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let top = leftTopBlack[1];
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const bottom = rightBottomBlack[1];
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let left = leftTopBlack[0];
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const right = rightBottomBlack[0];
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const matrixWidth = (right - left + 1) / moduleSize;
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const matrixHeight = (bottom - top + 1) / moduleSize;
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if (matrixWidth <= 0 || matrixHeight <= 0) {
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throw new NotFoundException();
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}
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// Push in the "border" by half the module width so that we start
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// sampling in the middle of the module. Just in case the image is a
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// little off, this will help recover.
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const nudge = moduleSize / 2;
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top += nudge;
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left += nudge;
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// Now just read off the bits
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const bits = new BitMatrix(matrixWidth, matrixHeight);
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for (let y = 0; y < matrixHeight; y++) {
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const iOffset = top + y * moduleSize;
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for (let x = 0; x < matrixWidth; x++) {
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if (image.get(left + x * moduleSize, iOffset)) {
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bits.set(x, y);
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}
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}
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}
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return bits;
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}
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static moduleSize(leftTopBlack, image) {
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const width = image.getWidth();
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let x = leftTopBlack[0];
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const y = leftTopBlack[1];
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while (x < width && image.get(x, y)) {
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x++;
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}
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if (x === width) {
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throw new NotFoundException();
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}
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const moduleSize = x - leftTopBlack[0];
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if (moduleSize === 0) {
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throw new NotFoundException();
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}
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return moduleSize;
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}
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}
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DataMatrixReader.NO_POINTS = [];
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