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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
package com.itextpdf.barcodes.qrcode;
import com.itextpdf.barcodes.exceptions.WriterException;
import java.util.Map;
/**
* This object renders a QR Code as a ByteMatrix 2D array of greyscale values.
*
* @author [email protected] (Daniel Switkin)
*/
public final class QRCodeWriter {
private static final int QUIET_ZONE_SIZE = 4;
/**
* Encode a string into a QR code with dimensions width x height, using error-correction level L and the smallest version for which he contents fit into the QR-code?
* @param contents String to encode into the QR code
* @param width width of the QR-code
* @param height height of the QR-code
* @return 2D Greyscale map containing the visual representation of the QR-code, stored as a Bytematrix
* @throws WriterException exception is thrown in case an error occurs when encoding a barcode using the Writer framework
*/
public ByteMatrix encode(String contents, int width, int height)
throws WriterException {
return encode(contents, width, height, null);
}
/**
* Encode a string into a QR code with dimensions width x height. Hints contains suggestions for error-correction level and version.
* The default error-correction level is L, the default version is the smallest version for which the contents will fit into the QR-code.
* @param contents String to encode into the QR code
* @param width width of the QR-code
* @param height height of the QR-code
* @param hints Map containing suggestions for error-correction level and version
* @return 2D Greyscale map containing the visual representation of the QR-code, stored as a Bytematrix
* @throws WriterException exception is thrown in case an error occurs when encoding a barcode using the Writer framework
*/
public ByteMatrix encode(String contents, int width, int height,
Map hints) throws WriterException {
if (contents == null || contents.length() == 0) {
throw new IllegalArgumentException("Found empty contents");
}
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' +
height);
}
ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
if (hints != null) {
ErrorCorrectionLevel requestedECLevel = (ErrorCorrectionLevel) hints.get(EncodeHintType.ERROR_CORRECTION);
if (requestedECLevel != null) {
errorCorrectionLevel = requestedECLevel;
}
}
QRCode code = new QRCode();
Encoder.encode(contents, errorCorrectionLevel, hints, code);
return renderResult(code, width, height);
}
// 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).
private static ByteMatrix renderResult(QRCode code, int width, int height) {
ByteMatrix input = code.getMatrix();
int inputWidth = input.getWidth();
int inputHeight = input.getHeight();
int qrWidth = inputWidth + (QUIET_ZONE_SIZE << 1);
int qrHeight = inputHeight + (QUIET_ZONE_SIZE << 1);
int outputWidth = Math.max(width, qrWidth);
int outputHeight = Math.max(height, qrHeight);
int multiple = Math.min(outputWidth / qrWidth, 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.
int leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
int topPadding = (outputHeight - (inputHeight * multiple)) / 2;
ByteMatrix output = new ByteMatrix(outputWidth, outputHeight);
byte[][] outputArray = output.getArray();
// We could be tricky and use the first row in each set of multiple as the temporary storage,
// instead of allocating this separate array.
byte[] row = new byte[outputWidth];
// 1. Write the white lines at the top
for (int y = 0; y < topPadding; y++) {
setRowColor(outputArray[y], (byte) 255);
}
// 2. Expand the QR image to the multiple
byte[][] inputArray = input.getArray();
for (int y = 0; y < inputHeight; y++) {
// a. Write the white pixels at the left of each row
for (int x = 0; x < leftPadding; x++) {
row[x] = (byte) 255;
}
// b. Write the contents of this row of the barcode
int offset = leftPadding;
for (int x = 0; x < inputWidth; x++) {
byte value = (inputArray[y][x] == 1) ? (byte) 0 : (byte) 255;
for (int z = 0; z < multiple; z++) {
row[offset + z] = value;
}
offset += multiple;
}
// c. Write the white pixels at the right of each row
offset = leftPadding + (inputWidth * multiple);
for (int x = offset; x < outputWidth; x++) {
row[x] = (byte) 255;
}
// d. Write the completed row multiple times
offset = topPadding + (y * multiple);
for (int z = 0; z < multiple; z++) {
System.arraycopy(row, 0, outputArray[offset + z], 0, outputWidth);
}
}
// 3. Write the white lines at the bottom
int offset = topPadding + (inputHeight * multiple);
for (int y = offset; y < outputHeight; y++) {
setRowColor(outputArray[y], (byte) 255);
}
return output;
}
private static void setRowColor(byte[] row, byte value) {
for (int x = 0; x < row.length; x++) {
row[x] = value;
}
}
}
