Optimize generating BufferedImage by allocating memory per row. Add tests. Remove old jetty plugin.

javase/pom.xml

@@ -36,6 +36,11 @@
       <artifactId>jai-imageio-core</artifactId>
       <version>1.3.1</version>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <parent>

javase/src/main/java/com/google/zxing/client/j2se/MatrixToImageWriter.java

@@ -16,6 +16,7 @@
 
 package com.google.zxing.client.j2se;
 
+import com.google.zxing.common.BitArray;
 import com.google.zxing.common.BitMatrix;
 
 import javax.imageio.ImageIO;
@@ -62,14 +63,15 @@ public final class MatrixToImageWriter {
     BufferedImage image = new BufferedImage(width, height, config.getBufferedImageColorModel());
     int onColor = config.getPixelOnColor();
     int offColor = config.getPixelOffColor();
-    int[] pixels = new int[width * height];
-    int index = 0;
+    int[] rowPixels = new int[width];
+    BitArray row = new BitArray(width);
     for (int y = 0; y < height; y++) {
+      row = matrix.getRow(y, row);
       for (int x = 0; x < width; x++) {
-          pixels[index++] = matrix.get(x, y) ? onColor : offColor;
+        rowPixels[x] = row.get(x) ? onColor : offColor;
       }
+      image.setRGB(0, y, width, 1, rowPixels, 0, width);
     }
-    image.setRGB(0, 0, width, height, pixels, 0, width);
     return image;
   }
 

javase/src/test/java/com/google/zxing/client/j2se/MatrixToImageWriterTestCase.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2017 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.common.BitMatrix;
+import org.junit.Assert;
+import org.junit.Test;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public final class MatrixToImageWriterTestCase extends Assert {
+  
+  @Test
+  public void testBlackAndWhite() throws Exception {
+    doTest(new MatrixToImageConfig());
+  }
+
+  @Test
+  public void testColor() throws Exception {
+    doTest(new MatrixToImageConfig(0xFF102030, 0xFF405060));
+  }
+
+  @Test
+  public void testAlpha() throws Exception {
+    doTest(new MatrixToImageConfig(0x7F102030, 0x7F405060));
+  }
+  
+  private static void doTest(MatrixToImageConfig config) throws IOException {
+    doTestFormat("tiff", config);
+    doTestFormat("png", config);
+  }
+
+  private static void doTestFormat(String format, MatrixToImageConfig config) throws IOException {
+    int width = 2;
+    int height = 3;
+    BitMatrix matrix = new BitMatrix(width, height);
+    matrix.set(0, 0);
+    matrix.set(0, 1);
+    matrix.set(1, 2);
+    
+    BufferedImage newImage = null;
+    Path tempFile = Files.createTempFile(null, "." + format);
+    try {
+      MatrixToImageWriter.writeToPath(matrix, format, tempFile, config);
+      assertTrue(Files.size(tempFile) > 0);
+      newImage = ImageIO.read(tempFile.toFile());
+    } finally {
+      Files.delete(tempFile);
+    }
+
+    assertEquals(width, newImage.getWidth());
+    assertEquals(height, newImage.getHeight());
+    for (int y = 0; y < height; y++) {
+      for (int x = 0; x < width; x++) {
+        int expected = matrix.get(x, y) ? config.getPixelOnColor() : config.getPixelOffColor();
+        int actual = newImage.getRGB(x, y);
+        assertEquals(
+            "At " + x + "," + y + " expected " + Integer.toHexString(expected) + 
+            " but got " + Integer.toHexString(actual),
+            expected, actual);
+      }
+    }
+  }
+  
+}

zxingorg/pom.xml

@@ -54,11 +54,6 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-war-plugin</artifactId>
       </plugin>
-      <plugin>
-        <groupId>org.eclipse.jetty</groupId>
-        <artifactId>jetty-maven-plugin</artifactId>
-        <version>9.4.3.v20170317</version>
-      </plugin>
     </plugins>
   </build>