2 * Copyright 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.qrcode;
19 import com.google.zxing.BarcodeFormat;
20 import com.google.zxing.EncodeHintType;
21 import com.google.zxing.WriterException;
22 import com.google.zxing.common.BitMatrix;
23 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
24 import org.junit.Assert;
25 import org.junit.Test;
27 import javax.imageio.ImageIO;
28 import java.awt.image.BufferedImage;
30 import java.io.IOException;
31 import java.util.Hashtable;
34 * @author satorux@google.com (Satoru Takabayashi) - creator
35 * @author dswitkin@google.com (Daniel Switkin) - ported and expanded from C++
37 public final class QRCodeWriterTestCase extends Assert {
39 private static final String BASE_IMAGE_PATH = "test/data/golden/qrcode/";
41 private static BufferedImage loadImage(String fileName) {
43 File file = new File(BASE_IMAGE_PATH + fileName);
45 // try starting with 'core' since the test base is often given as the project root
46 file = new File("core/" + BASE_IMAGE_PATH + fileName);
48 assertTrue("Please run from the 'core' directory", file.exists());
49 return ImageIO.read(file);
50 } catch (IOException e) {
55 // In case the golden images are not monochromatic, convert the RGB values to greyscale.
56 private static BitMatrix createMatrixFromImage(BufferedImage image) {
57 int width = image.getWidth();
58 int height = image.getHeight();
59 int[] pixels = new int[width * height];
60 image.getRGB(0, 0, width, height, pixels, 0, width);
62 BitMatrix matrix = new BitMatrix(width, height);
63 for (int y = 0; y < height; y++) {
64 for (int x = 0; x < width; x++) {
65 int pixel = pixels[y * width + x];
66 int luminance = (306 * ((pixel >> 16) & 0xFF) +
67 601 * ((pixel >> 8) & 0xFF) +
68 117 * (pixel & 0xFF)) >> 10;
69 if (luminance <= 0x7F) {
78 public void testQRCodeWriter() throws WriterException {
79 // The QR should be multiplied up to fit, with extra padding if necessary
81 QRCodeWriter writer = new QRCodeWriter();
82 BitMatrix matrix = writer.encode("http://www.google.com/", BarcodeFormat.QR_CODE, bigEnough,
84 assertNotNull(matrix);
85 assertEquals(bigEnough, matrix.getWidth());
86 assertEquals(bigEnough, matrix.getHeight());
88 // The QR will not fit in this size, so the matrix should come back bigger
90 matrix = writer.encode("http://www.google.com/", BarcodeFormat.QR_CODE, tooSmall,
92 assertNotNull(matrix);
93 assertTrue(tooSmall < matrix.getWidth());
94 assertTrue(tooSmall < matrix.getHeight());
96 // We should also be able to handle non-square requests by padding them
97 int strangeWidth = 500;
98 int strangeHeight = 100;
99 matrix = writer.encode("http://www.google.com/", BarcodeFormat.QR_CODE, strangeWidth,
100 strangeHeight, null);
101 assertNotNull(matrix);
102 assertEquals(strangeWidth, matrix.getWidth());
103 assertEquals(strangeHeight, matrix.getHeight());
106 private static void compareToGoldenFile(String contents, ErrorCorrectionLevel ecLevel,
107 int resolution, String fileName) throws WriterException {
109 BufferedImage image = loadImage(fileName);
110 assertNotNull(image);
111 BitMatrix goldenResult = createMatrixFromImage(image);
112 assertNotNull(goldenResult);
114 QRCodeWriter writer = new QRCodeWriter();
115 Hashtable<EncodeHintType,Object> hints = new Hashtable<EncodeHintType,Object>();
116 hints.put(EncodeHintType.ERROR_CORRECTION, ecLevel);
117 BitMatrix generatedResult = writer.encode(contents, BarcodeFormat.QR_CODE, resolution,
120 assertEquals(resolution, generatedResult.getWidth());
121 assertEquals(resolution, generatedResult.getHeight());
122 assertEquals(goldenResult, generatedResult);
125 // Golden images are generated with "qrcode_sample.cc". The images are checked with both eye balls
126 // and cell phones. We expect pixel-perfect results, because the error correction level is known,
127 // and the pixel dimensions matches exactly.
129 public void testRegressionTest() throws WriterException {
130 compareToGoldenFile("http://www.google.com/", ErrorCorrectionLevel.M, 99,
131 "renderer-test-01.png");
133 compareToGoldenFile("12345", ErrorCorrectionLevel.L, 58, "renderer-test-02.png");
135 // Test in Katakana in Shift_JIS.
136 // TODO: this test is bogus now that byte mode has been basically fixed to assuming ISO-8859-1 encoding
137 // The real solution is to implement Kanji mode, in which case the golden file will be wrong again
140 new String(new byte[] {(byte)0x83, 0x65, (byte)0x83, 0x58, (byte)0x83, 0x67}, "Shift_JIS"),
141 ErrorCorrectionLevel.H, 145,
142 "renderer-test-03.png");