@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
92 lines (91 loc) • 3.36 kB
JavaScript
/*
* Copyright 2010 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.
*/
import Result from '../Result';
import BarcodeFormat from '../BarcodeFormat';
import DecodeHintType from '../DecodeHintType';
import ResultMetadataType from '../ResultMetadataType';
import System from '../util/System';
import Decoder from './decoder/Decoder';
import Detector from './detector/Detector';
// import java.util.List;
// import java.util.Map;
/**
* This implementation can detect and decode Aztec codes in an image.
*
* @author David Olivier
*/
export default class AztecReader {
/**
* Locates and decodes a Data Matrix code in an image.
*
* @return a String representing the content encoded by the Data Matrix code
* @throws NotFoundException if a Data Matrix code cannot be found
* @throws FormatException if a Data Matrix code cannot be decoded
*/
decode(image, hints = null) {
let exception = null;
let detector = new Detector(image.getBlackMatrix());
let points = null;
let decoderResult = null;
try {
let detectorResult = detector.detectMirror(false);
points = detectorResult.getPoints();
this.reportFoundResultPoints(hints, points);
decoderResult = new Decoder().decode(detectorResult);
}
catch (e) {
exception = e;
}
if (decoderResult == null) {
try {
let detectorResult = detector.detectMirror(true);
points = detectorResult.getPoints();
this.reportFoundResultPoints(hints, points);
decoderResult = new Decoder().decode(detectorResult);
}
catch (e) {
if (exception != null) {
throw exception;
}
throw e;
}
}
let result = new Result(decoderResult.getText(), decoderResult.getRawBytes(), decoderResult.getNumBits(), points, BarcodeFormat.AZTEC, System.currentTimeMillis());
let byteSegments = decoderResult.getByteSegments();
if (byteSegments != null) {
result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, byteSegments);
}
let ecLevel = decoderResult.getECLevel();
if (ecLevel != null) {
result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, ecLevel);
}
return result;
}
reportFoundResultPoints(hints, points) {
if (hints != null) {
let rpcb = hints.get(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
if (rpcb != null) {
points.forEach((point, idx, arr) => {
rpcb.foundPossibleResultPoint(point);
});
}
}
}
// @Override
reset() {
// do nothing
}
}