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Java SE-specific extensions to core ZXing library
/*
* Copyright 2011 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.
*/
package com.google.zxing.client.j2se;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.result.ParsedResult;
import com.google.zxing.client.result.ResultParser;
import com.google.zxing.common.BitArray;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.multi.GenericMultipleBarcodeReader;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.Callable;
/**
* One of a pool of threads which pulls images off the Inputs queue and decodes them in parallel.
*
* @see CommandLineRunner
*/
final class DecodeWorker implements Callable {
private final Config config;
private final Queue inputs;
DecodeWorker(Config config, Queue inputs) {
this.config = config;
this.inputs = inputs;
}
@Override
public Integer call() throws IOException {
int successful = 0;
String input;
while ((input = inputs.poll()) != null) {
File inputFile = new File(input);
if (inputFile.exists()) {
if (config.isMulti()) {
Result[] results = decodeMulti(inputFile.toURI(), config.getHints());
if (results != null) {
successful++;
if (config.isDumpResults()) {
dumpResultMulti(inputFile, results);
}
}
} else {
Result result = decode(inputFile.toURI(), config.getHints());
if (result != null) {
successful++;
if (config.isDumpResults()) {
dumpResult(inputFile, result);
}
}
}
} else {
if (decode(URI.create(input), config.getHints()) != null) {
successful++;
}
}
}
return successful;
}
private static void dumpResult(File input, Result result) throws IOException {
String name = input.getCanonicalPath();
int pos = name.lastIndexOf('.');
if (pos > 0) {
name = name.substring(0, pos);
}
File dump = new File(name + ".txt");
writeStringToFile(result.getText(), dump);
}
private static void dumpResultMulti(File input, Result[] results) throws IOException {
String name = input.getCanonicalPath();
int pos = name.lastIndexOf('.');
if (pos > 0) {
name = name.substring(0, pos);
}
File dump = new File(name + ".txt");
writeResultsToFile(results, dump);
}
private static void writeStringToFile(String value, File file) throws IOException {
Writer out = new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF8"));
try {
out.write(value);
} finally {
out.close();
}
}
private static void writeResultsToFile(Result[] results, File file) throws IOException {
String newline = System.getProperty("line.separator");
Writer out = new OutputStreamWriter(new FileOutputStream(file), Charset.forName("UTF8"));
try {
for (Result result : results) {
out.write(result.getText());
out.write(newline);
}
} finally {
out.close();
}
}
private Result decode(URI uri, Map hints) throws IOException {
BufferedImage image = ImageReader.readImage(uri);
try {
LuminanceSource source;
if (config.getCrop() == null) {
source = new BufferedImageLuminanceSource(image);
} else {
int[] crop = config.getCrop();
source = new BufferedImageLuminanceSource(image, crop[0], crop[1], crop[2], crop[3]);
}
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
if (config.isDumpBlackPoint()) {
dumpBlackPoint(uri, image, bitmap);
}
Result result = new MultiFormatReader().decode(bitmap, hints);
if (config.isBrief()) {
System.out.println(uri.toString() + ": Success");
} else {
ParsedResult parsedResult = ResultParser.parseResult(result);
System.out.println(uri.toString() + " (format: " + result.getBarcodeFormat() + ", type: " +
parsedResult.getType() + "):\nRaw result:\n" + result.getText() + "\nParsed result:\n" +
parsedResult.getDisplayResult());
System.out.println("Found " + result.getResultPoints().length + " result points.");
for (int i = 0; i < result.getResultPoints().length; i++) {
ResultPoint rp = result.getResultPoints()[i];
if (rp != null) {
System.out.println(" Point " + i + ": (" + rp.getX() + ',' + rp.getY() + ')');
}
}
}
return result;
} catch (NotFoundException ignored) {
System.out.println(uri.toString() + ": No barcode found");
return null;
}
}
private Result[] decodeMulti(URI uri, Map hints) throws IOException {
BufferedImage image = ImageReader.readImage(uri);
try {
LuminanceSource source;
if (config.getCrop() == null) {
source = new BufferedImageLuminanceSource(image);
} else {
int[] crop = config.getCrop();
source = new BufferedImageLuminanceSource(image, crop[0], crop[1], crop[2], crop[3]);
}
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
if (config.isDumpBlackPoint()) {
dumpBlackPoint(uri, image, bitmap);
}
MultiFormatReader multiFormatReader = new MultiFormatReader();
GenericMultipleBarcodeReader reader = new GenericMultipleBarcodeReader(
multiFormatReader);
Result[] results = reader.decodeMultiple(bitmap, hints);
if (config.isBrief()) {
System.out.println(uri.toString() + ": Success");
} else {
for (Result result : results) {
ParsedResult parsedResult = ResultParser.parseResult(result);
System.out.println(uri.toString() + " (format: "
+ result.getBarcodeFormat() + ", type: "
+ parsedResult.getType() + "):\nRaw result:\n"
+ result.getText() + "\nParsed result:\n"
+ parsedResult.getDisplayResult());
System.out.println("Found " + result.getResultPoints().length + " result points.");
for (int i = 0; i < result.getResultPoints().length; i++) {
ResultPoint rp = result.getResultPoints()[i];
System.out.println(" Point " + i + ": (" + rp.getX() + ',' + rp.getY() + ')');
}
}
}
return results;
} catch (NotFoundException ignored) {
System.out.println(uri.toString() + ": No barcode found");
return null;
}
}
/**
* Writes out a single PNG which is three times the width of the input image, containing from left
* to right: the original image, the row sampling monochrome version, and the 2D sampling
* monochrome version.
*/
private static void dumpBlackPoint(URI uri, BufferedImage image, BinaryBitmap bitmap) {
// TODO: Update to compare different Binarizer implementations.
String inputName = uri.getPath();
if (inputName.contains(".mono.png")) {
return;
}
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int stride = width * 3;
int[] pixels = new int[stride * height];
// The original image
int[] argb = new int[width];
for (int y = 0; y < height; y++) {
image.getRGB(0, y, width, 1, argb, 0, width);
System.arraycopy(argb, 0, pixels, y * stride, width);
}
// Row sampling
BitArray row = new BitArray(width);
for (int y = 0; y < height; y++) {
try {
row = bitmap.getBlackRow(y, row);
} catch (NotFoundException nfe) {
// If fetching the row failed, draw a red line and keep going.
int offset = y * stride + width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = 0xffff0000;
}
continue;
}
int offset = y * stride + width;
for (int x = 0; x < width; x++) {
if (row.get(x)) {
pixels[offset + x] = 0xff000000;
} else {
pixels[offset + x] = 0xffffffff;
}
}
}
// 2D sampling
try {
for (int y = 0; y < height; y++) {
BitMatrix matrix = bitmap.getBlackMatrix();
int offset = y * stride + width * 2;
for (int x = 0; x < width; x++) {
if (matrix.get(x, y)) {
pixels[offset + x] = 0xff000000;
} else {
pixels[offset + x] = 0xffffffff;
}
}
}
} catch (NotFoundException ignored) {
// continue
}
writeResultImage(stride, height, pixels, uri, inputName, ".mono.png");
}
private static void writeResultImage(int stride,
int height,
int[] pixels,
URI uri,
String inputName,
String suffix) {
// Write the result
BufferedImage result = new BufferedImage(stride, height, BufferedImage.TYPE_INT_ARGB);
result.setRGB(0, 0, stride, height, pixels, 0, stride);
// Use the current working directory for URLs
String resultName = inputName;
if ("http".equals(uri.getScheme())) {
int pos = resultName.lastIndexOf('/');
if (pos > 0) {
resultName = '.' + resultName.substring(pos);
}
}
int pos = resultName.lastIndexOf('.');
if (pos > 0) {
resultName = resultName.substring(0, pos);
}
resultName += suffix;
OutputStream outStream = null;
try {
outStream = new FileOutputStream(resultName);
if (!ImageIO.write(result, "png", outStream)) {
System.err.println("Could not encode an image to " + resultName);
}
} catch (FileNotFoundException ignored) {
System.err.println("Could not create " + resultName);
} catch (IOException ignored) {
System.err.println("Could not write to " + resultName);
} finally {
try {
if (outStream != null) {
outStream.close();
}
} catch (IOException ioe) {
// continue
}
}
}
}
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