/*
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* Copyright 2013 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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// import com.google.zxing.pdf417.PDF417Common;
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import PDF417Common from '../PDF417Common';
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import BarcodeMetadata from './BarcodeMetadata';
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import DetectionResultColumn from './DetectionResultColumn';
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import BarcodeValue from './BarcodeValue';
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/**
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* @author Guenther Grau
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*/
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export default /*final*/ class DetectionResultRowIndicatorColumn extends DetectionResultColumn {
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constructor(boundingBox, isLeft) {
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super(boundingBox);
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this._isLeft = isLeft;
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}
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setRowNumbers() {
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for (let codeword /*Codeword*/ of this.getCodewords()) {
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if (codeword != null) {
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codeword.setRowNumberAsRowIndicatorColumn();
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}
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}
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}
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// TODO implement properly
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// TODO maybe we should add missing codewords to store the correct row number to make
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// finding row numbers for other columns easier
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// use row height count to make detection of invalid row numbers more reliable
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adjustCompleteIndicatorColumnRowNumbers(barcodeMetadata) {
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let codewords = this.getCodewords();
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this.setRowNumbers();
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this.removeIncorrectCodewords(codewords, barcodeMetadata);
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let boundingBox = this.getBoundingBox();
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let top = this._isLeft ? boundingBox.getTopLeft() : boundingBox.getTopRight();
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let bottom = this._isLeft ? boundingBox.getBottomLeft() : boundingBox.getBottomRight();
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let firstRow = this.imageRowToCodewordIndex(Math.trunc(top.getY()));
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let lastRow = this.imageRowToCodewordIndex(Math.trunc(bottom.getY()));
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// We need to be careful using the average row height. Barcode could be skewed so that we have smaller and
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// taller rows
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// float averageRowHeight = (lastRow - firstRow) / /*(float)*/ barcodeMetadata.getRowCount();
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let barcodeRow = -1;
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let maxRowHeight = 1;
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let currentRowHeight = 0;
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for (let codewordsRow /*int*/ = firstRow; codewordsRow < lastRow; codewordsRow++) {
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if (codewords[codewordsRow] == null) {
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continue;
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}
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let codeword = codewords[codewordsRow];
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// float expectedRowNumber = (codewordsRow - firstRow) / averageRowHeight;
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// if (Math.abs(codeword.getRowNumber() - expectedRowNumber) > 2) {
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// SimpleLog.log(LEVEL.WARNING,
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// "Removing codeword, rowNumberSkew too high, codeword[" + codewordsRow + "]: Expected Row: " +
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// expectedRowNumber + ", RealRow: " + codeword.getRowNumber() + ", value: " + codeword.getValue());
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// codewords[codewordsRow] = null;
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// }
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let rowDifference = codeword.getRowNumber() - barcodeRow;
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// TODO improve handling with case where first row indicator doesn't start with 0
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if (rowDifference === 0) {
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currentRowHeight++;
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}
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else if (rowDifference === 1) {
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maxRowHeight = Math.max(maxRowHeight, currentRowHeight);
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currentRowHeight = 1;
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barcodeRow = codeword.getRowNumber();
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}
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else if (rowDifference < 0 ||
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codeword.getRowNumber() >= barcodeMetadata.getRowCount() ||
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rowDifference > codewordsRow) {
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codewords[codewordsRow] = null;
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}
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else {
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let checkedRows;
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if (maxRowHeight > 2) {
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checkedRows = (maxRowHeight - 2) * rowDifference;
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}
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else {
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checkedRows = rowDifference;
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}
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let closePreviousCodewordFound = checkedRows >= codewordsRow;
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for (let i /*int*/ = 1; i <= checkedRows && !closePreviousCodewordFound; i++) {
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// there must be (height * rowDifference) number of codewords missing. For now we assume height = 1.
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// This should hopefully get rid of most problems already.
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closePreviousCodewordFound = codewords[codewordsRow - i] != null;
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}
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if (closePreviousCodewordFound) {
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codewords[codewordsRow] = null;
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}
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else {
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barcodeRow = codeword.getRowNumber();
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currentRowHeight = 1;
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}
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}
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}
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// return (int) (averageRowHeight + 0.5);
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}
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getRowHeights() {
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let barcodeMetadata = this.getBarcodeMetadata();
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if (barcodeMetadata == null) {
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return null;
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}
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this.adjustIncompleteIndicatorColumnRowNumbers(barcodeMetadata);
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let result = new Int32Array(barcodeMetadata.getRowCount());
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for (let codeword /*Codeword*/ of this.getCodewords()) {
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if (codeword != null) {
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let rowNumber = codeword.getRowNumber();
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if (rowNumber >= result.length) {
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// We have more rows than the barcode metadata allows for, ignore them.
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continue;
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}
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result[rowNumber]++;
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} // else throw exception?
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}
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return result;
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}
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// TODO maybe we should add missing codewords to store the correct row number to make
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// finding row numbers for other columns easier
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// use row height count to make detection of invalid row numbers more reliable
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adjustIncompleteIndicatorColumnRowNumbers(barcodeMetadata) {
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let boundingBox = this.getBoundingBox();
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let top = this._isLeft ? boundingBox.getTopLeft() : boundingBox.getTopRight();
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let bottom = this._isLeft ? boundingBox.getBottomLeft() : boundingBox.getBottomRight();
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let firstRow = this.imageRowToCodewordIndex(Math.trunc(top.getY()));
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let lastRow = this.imageRowToCodewordIndex(Math.trunc(bottom.getY()));
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// float averageRowHeight = (lastRow - firstRow) / /*(float)*/ barcodeMetadata.getRowCount();
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let codewords = this.getCodewords();
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let barcodeRow = -1;
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let maxRowHeight = 1;
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let currentRowHeight = 0;
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for (let codewordsRow /*int*/ = firstRow; codewordsRow < lastRow; codewordsRow++) {
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if (codewords[codewordsRow] == null) {
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continue;
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}
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let codeword = codewords[codewordsRow];
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codeword.setRowNumberAsRowIndicatorColumn();
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let rowDifference = codeword.getRowNumber() - barcodeRow;
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// TODO improve handling with case where first row indicator doesn't start with 0
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if (rowDifference === 0) {
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currentRowHeight++;
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}
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else if (rowDifference === 1) {
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maxRowHeight = Math.max(maxRowHeight, currentRowHeight);
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currentRowHeight = 1;
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barcodeRow = codeword.getRowNumber();
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}
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else if (codeword.getRowNumber() >= barcodeMetadata.getRowCount()) {
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codewords[codewordsRow] = null;
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}
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else {
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barcodeRow = codeword.getRowNumber();
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currentRowHeight = 1;
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}
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}
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// return (int) (averageRowHeight + 0.5);
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}
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getBarcodeMetadata() {
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let codewords = this.getCodewords();
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let barcodeColumnCount = new BarcodeValue();
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let barcodeRowCountUpperPart = new BarcodeValue();
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let barcodeRowCountLowerPart = new BarcodeValue();
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let barcodeECLevel = new BarcodeValue();
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for (let codeword /*Codeword*/ of codewords) {
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if (codeword == null) {
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continue;
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}
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codeword.setRowNumberAsRowIndicatorColumn();
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let rowIndicatorValue = codeword.getValue() % 30;
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let codewordRowNumber = codeword.getRowNumber();
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if (!this._isLeft) {
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codewordRowNumber += 2;
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}
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switch (codewordRowNumber % 3) {
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case 0:
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barcodeRowCountUpperPart.setValue(rowIndicatorValue * 3 + 1);
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break;
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case 1:
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barcodeECLevel.setValue(rowIndicatorValue / 3);
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barcodeRowCountLowerPart.setValue(rowIndicatorValue % 3);
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break;
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case 2:
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barcodeColumnCount.setValue(rowIndicatorValue + 1);
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break;
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}
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}
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// Maybe we should check if we have ambiguous values?
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if ((barcodeColumnCount.getValue().length === 0) ||
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(barcodeRowCountUpperPart.getValue().length === 0) ||
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(barcodeRowCountLowerPart.getValue().length === 0) ||
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(barcodeECLevel.getValue().length === 0) ||
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barcodeColumnCount.getValue()[0] < 1 ||
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barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] < PDF417Common.MIN_ROWS_IN_BARCODE ||
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barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] > PDF417Common.MAX_ROWS_IN_BARCODE) {
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return null;
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}
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let barcodeMetadata = new BarcodeMetadata(barcodeColumnCount.getValue()[0], barcodeRowCountUpperPart.getValue()[0], barcodeRowCountLowerPart.getValue()[0], barcodeECLevel.getValue()[0]);
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this.removeIncorrectCodewords(codewords, barcodeMetadata);
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return barcodeMetadata;
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}
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removeIncorrectCodewords(codewords, barcodeMetadata) {
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// Remove codewords which do not match the metadata
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// TODO Maybe we should keep the incorrect codewords for the start and end positions?
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for (let codewordRow /*int*/ = 0; codewordRow < codewords.length; codewordRow++) {
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let codeword = codewords[codewordRow];
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if (codewords[codewordRow] == null) {
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continue;
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}
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let rowIndicatorValue = codeword.getValue() % 30;
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let codewordRowNumber = codeword.getRowNumber();
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if (codewordRowNumber > barcodeMetadata.getRowCount()) {
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codewords[codewordRow] = null;
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continue;
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}
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if (!this._isLeft) {
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codewordRowNumber += 2;
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}
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switch (codewordRowNumber % 3) {
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case 0:
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if (rowIndicatorValue * 3 + 1 !== barcodeMetadata.getRowCountUpperPart()) {
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codewords[codewordRow] = null;
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}
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break;
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case 1:
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if (Math.trunc(rowIndicatorValue / 3) !== barcodeMetadata.getErrorCorrectionLevel() ||
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rowIndicatorValue % 3 !== barcodeMetadata.getRowCountLowerPart()) {
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codewords[codewordRow] = null;
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}
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break;
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case 2:
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if (rowIndicatorValue + 1 !== barcodeMetadata.getColumnCount()) {
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codewords[codewordRow] = null;
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}
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break;
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}
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}
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}
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isLeft() {
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return this._isLeft;
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}
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// @Override
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toString() {
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return 'IsLeft: ' + this._isLeft + '\n' + super.toString();
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}
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}
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