Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ /* $Id: BitmapImageUtilTestCase.java 1178747 2011-10-04 10:09:01Z vhennebert $ */ package org.apache.fop.util; import static org.junit.Assert.assertEquals; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.awt.image.RenderedImage; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.StringWriter; import org.apache.commons.io.IOUtils; import org.apache.fop.util.bitmap.BitmapImageUtil; import org.apache.fop.util.bitmap.MonochromeBitmapConverter; import org.apache.xmlgraphics.image.writer.ImageWriterUtil; import org.apache.xmlgraphics.util.WriterOutputStream; import org.apache.xmlgraphics.util.io.ASCIIHexOutputStream; import org.junit.Test; /** * Tests {@link BitmapImageUtil}. */ public class BitmapImageUtilTestCase { private static final boolean DEBUG = true; private static final boolean TEST_PIXELS = false; /** * Tests the convertTo* methods. * @throws Exception if an error occurs */ @Test public void testConvertToMono() throws Exception { BufferedImage testImage = createTestImage(); saveAsPNG(testImage, "test-image"); RenderedImage img; Dimension scaled = new Dimension(320, 240); img = BitmapImageUtil.convertToGrayscale(testImage, null); saveAsPNG(img, "out-gray"); assertEquals(1, img.getColorModel().getNumComponents()); assertEquals(8, img.getColorModel().getPixelSize()); assertEquals(640, img.getWidth()); assertEquals(480, img.getHeight()); assertPixels("5757575757575757575757FFFFFFFFFF", img, 220, 34, 16); img = BitmapImageUtil.convertToGrayscale(testImage, scaled); saveAsPNG(img, "out-gray-scaled"); assertEquals(1, img.getColorModel().getNumComponents()); assertEquals(8, img.getColorModel().getPixelSize()); assertEquals(320, img.getWidth()); assertEquals(240, img.getHeight()); img = BitmapImageUtil.convertToMonochrome(testImage, null); saveAsPNG(img, "out-mono"); assertEquals(1, img.getColorModel().getPixelSize()); assertEquals(640, img.getWidth()); assertEquals(480, img.getHeight()); assertPixels("00000000000000000000000101010101", img, 220, 34, 16); if (isJAIAvailable()) { img = BitmapImageUtil.convertToMonochrome(testImage, null, 0.5f); saveAsPNG(img, "out-mono-jai-0.5"); assertEquals(1, img.getColorModel().getPixelSize()); assertEquals(640, img.getWidth()); assertEquals(480, img.getHeight()); assertPixels("00010000000100000001000101010101", img, 220, 34, 16); img = BitmapImageUtil.convertToMonochrome(testImage, null, 1.0f); saveAsPNG(img, "out-mono-jai-1.0"); assertEquals(1, img.getColorModel().getPixelSize()); assertEquals(640, img.getWidth()); assertEquals(480, img.getHeight()); assertPixels("01000001000001000001000101010101", img, 220, 34, 16); } } private void assertPixels(String expected, RenderedImage img, int x, int y, int w) throws IOException { if (TEST_PIXELS) { byte[] byteArray = (byte[]) img.getData().getDataElements(x, y, w, 1, new byte[w]); assertEquals(expected, toHex(byteArray)); } } private boolean isJAIAvailable() { MonochromeBitmapConverter converter = BitmapImageUtil.createDefaultMonochromeBitmapConverter(); return converter.getClass().getName().contains("JAI"); } private void saveAsPNG(RenderedImage img, String name) throws IOException { if (DEBUG) { File baseDir = new File("./build/test-results/bitmap-conversion"); baseDir.mkdirs(); ImageWriterUtil.saveAsPNG(img, new File(baseDir, name + ".png")); } } private String toHex(byte[] byteArray) throws IOException { InputStream in = new java.io.ByteArrayInputStream(byteArray); StringWriter writer = new StringWriter(); WriterOutputStream wo = new WriterOutputStream(writer, "US-ASCII"); ASCIIHexOutputStream hex = new ASCIIHexOutputStream(wo); IOUtils.copyLarge(in, hex); return writer.toString(); } private BufferedImage createTestImage() { BufferedImage buf = new BufferedImage(640, 480, BufferedImage.TYPE_INT_RGB); Graphics2D g2d = buf.createGraphics(); g2d.setBackground(Color.WHITE); g2d.clearRect(0, 0, buf.getWidth(), buf.getHeight()); //A few rectangles rotated and with different color Graphics2D copy = (Graphics2D) g2d.create(); copy.translate(170, 170); int c = 12; for (int i = 0; i < c; i++) { float f = ((i + 1) / (float) c); Color col = new Color(0.0f, 1 - f, 0.0f); copy.setColor(col); copy.fillRect(0, 0, 120, 120); copy.rotate(-2 * Math.PI / c); } copy.dispose(); //the same in gray scales copy = (Graphics2D) g2d.create(); copy.translate(470, 310); c = 12; for (int i = 0; i < c; i++) { float f = ((i + 1) / (float) c); Color col = new Color(f, f, f); copy.setColor(col); copy.fillRect(0, 0, 120, 120); copy.rotate(-2 * Math.PI / c); } copy.dispose(); return buf; } }