@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
99 lines (98 loc) • 4.99 kB
JavaScript
;
/*
* Copyright 2008 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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
/*namespace com.google.zxing.qrcode {*/
var BarcodeFormat_1 = require("../BarcodeFormat");
var EncodeHintType_1 = require("../EncodeHintType");
var BitMatrix_1 = require("../common/BitMatrix");
var ErrorCorrectionLevel_1 = require("./decoder/ErrorCorrectionLevel");
var Encoder_1 = require("./encoder/Encoder");
var IllegalArgumentException_1 = require("../IllegalArgumentException");
var IllegalStateException_1 = require("../IllegalStateException");
/*import java.util.Map;*/
/**
* This object renders a QR Code as a BitMatrix 2D array of greyscale values.
*
* @author dswitkin@google.com (Daniel Switkin)
*/
var QRCodeWriter = /** @class */ (function () {
function QRCodeWriter() {
}
/*@Override*/
// public encode(contents: string, format: BarcodeFormat, width: number /*int*/, height: number /*int*/): BitMatrix
// /*throws WriterException */ {
// return encode(contents, format, width, height, null)
// }
/*@Override*/
QRCodeWriter.prototype.encode = function (contents, format, width /*int*/, height /*int*/, hints) {
if (contents.length === 0) {
throw new IllegalArgumentException_1.default('Found empty contents');
}
if (format !== BarcodeFormat_1.default.QR_CODE) {
throw new IllegalArgumentException_1.default('Can only encode QR_CODE, but got ' + format);
}
if (width < 0 || height < 0) {
throw new IllegalArgumentException_1.default("Requested dimensions are too small: " + width + "x" + height);
}
var errorCorrectionLevel = ErrorCorrectionLevel_1.default.L;
var quietZone = QRCodeWriter.QUIET_ZONE_SIZE;
if (hints !== null) {
if (undefined !== hints.get(EncodeHintType_1.default.ERROR_CORRECTION)) {
errorCorrectionLevel = ErrorCorrectionLevel_1.default.fromString(hints.get(EncodeHintType_1.default.ERROR_CORRECTION).toString());
}
if (undefined !== hints.get(EncodeHintType_1.default.MARGIN)) {
quietZone = Number.parseInt(hints.get(EncodeHintType_1.default.MARGIN).toString(), 10);
}
}
var code = Encoder_1.default.encode(contents, errorCorrectionLevel, hints);
return QRCodeWriter.renderResult(code, width, height, quietZone);
};
// Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
// 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
QRCodeWriter.renderResult = function (code, width /*int*/, height /*int*/, quietZone /*int*/) {
var input = code.getMatrix();
if (input === null) {
throw new IllegalStateException_1.default();
}
var inputWidth = input.getWidth();
var inputHeight = input.getHeight();
var qrWidth = inputWidth + (quietZone * 2);
var qrHeight = inputHeight + (quietZone * 2);
var outputWidth = Math.max(width, qrWidth);
var outputHeight = Math.max(height, qrHeight);
var multiple = Math.min(Math.floor(outputWidth / qrWidth), Math.floor(outputHeight / qrHeight));
// Padding includes both the quiet zone and the extra white pixels to accommodate the requested
// dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
// If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
// handle all the padding from 100x100 (the actual QR) up to 200x160.
var leftPadding = Math.floor((outputWidth - (inputWidth * multiple)) / 2);
var topPadding = Math.floor((outputHeight - (inputHeight * multiple)) / 2);
var output = new BitMatrix_1.default(outputWidth, outputHeight);
for (var inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {
// Write the contents of this row of the barcode
for (var inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
if (input.get(inputX, inputY) === 1) {
output.setRegion(outputX, outputY, multiple, multiple);
}
}
}
return output;
};
QRCodeWriter.QUIET_ZONE_SIZE = 4;
return QRCodeWriter;
}());
exports.default = QRCodeWriter;