Java tutorial
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common * Development and Distribution License("CDDL") (collectively, the * "License"). You may not use this file except in compliance with the * License. You can obtain a copy of the License at * http://www.netbeans.org/cddl-gplv2.html * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the * specific language governing permissions and limitations under the * License. When distributing the software, include this License Header * Notice in each file and include the License file at * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this * particular file as subject to the "Classpath" exception as provided * by Sun in the GPL Version 2 section of the License file that * accompanied this code. If applicable, add the following below the * License Header, with the fields enclosed by brackets [] replaced by * your own identifying information: * "Portions Copyrighted [year] [name of copyright owner]" * * Contributor(s): Alexandre Iline. * * The Original Software is the Jemmy library. * The Initial Developer of the Original Software is Alexandre Iline. * All Rights Reserved. * * If you wish your version of this file to be governed by only the CDDL * or only the GPL Version 2, indicate your decision by adding * "[Contributor] elects to include this software in this distribution * under the [CDDL or GPL Version 2] license." If you do not indicate a * single choice of license, a recipient has the option to distribute * your version of this file under either the CDDL, the GPL Version 2 or * to extend the choice of license to its licensees as provided above. * However, if you add GPL Version 2 code and therefore, elected the GPL * Version 2 license, then the option applies only if the new code is * made subject to such option by the copyright holder. * * * * $Id$ $Revision$ $Date$ * */ import java.awt.AWTException; import java.awt.Color; import java.awt.Component; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.zip.CRC32; import java.util.zip.DataFormatException; import java.util.zip.Deflater; import java.util.zip.DeflaterOutputStream; import java.util.zip.Inflater; /** * Allows to load PNG graphical file. * @author Alexandre Iline */ public class PNGDecoder extends Object { InputStream in; /** * Constructs a PNGDecoder object. * @param in input stream to read PNG image from. */ public PNGDecoder(InputStream in) { this.in = in; } byte read() throws IOException { byte b = (byte) in.read(); return (b); } int readInt() throws IOException { byte b[] = read(4); return (((b[0] & 0xff) << 24) + ((b[1] & 0xff) << 16) + ((b[2] & 0xff) << 8) + ((b[3] & 0xff))); } byte[] read(int count) throws IOException { byte[] result = new byte[count]; for (int i = 0; i < count; i++) { result[i] = read(); } return (result); } boolean compare(byte[] b1, byte[] b2) { if (b1.length != b2.length) { return (false); } for (int i = 0; i < b1.length; i++) { if (b1[i] != b2[i]) { return (false); } } return (true); } void checkEquality(byte[] b1, byte[] b2) { if (!compare(b1, b2)) { throw (new RuntimeException("Format error")); } } /** * Decodes image from an input stream passed into constructor. * @return a BufferedImage object * @throws IOException */ public BufferedImage decode() throws IOException { byte[] id = read(12); checkEquality(id, new byte[] { -119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13 }); byte[] ihdr = read(4); checkEquality(ihdr, "IHDR".getBytes()); int width = readInt(); int height = readInt(); BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); byte[] head = read(5); int mode; if (compare(head, new byte[] { 1, 0, 0, 0, 0 })) { mode = PNGEncoder.BW_MODE; } else if (compare(head, new byte[] { 8, 0, 0, 0, 0 })) { mode = PNGEncoder.GREYSCALE_MODE; } else if (compare(head, new byte[] { 8, 2, 0, 0, 0 })) { mode = PNGEncoder.COLOR_MODE; } else { throw (new RuntimeException("Format error")); } readInt();//!!crc int size = readInt(); byte[] idat = read(4); checkEquality(idat, "IDAT".getBytes()); byte[] data = read(size); Inflater inflater = new Inflater(); inflater.setInput(data, 0, size); int color; try { switch (mode) { case PNGEncoder.BW_MODE: { int bytes = (int) (width / 8); if ((width % 8) != 0) { bytes++; } byte colorset; byte[] row = new byte[bytes]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < bytes; x++) { colorset = row[x]; for (int sh = 0; sh < 8; sh++) { if (x * 8 + sh >= width) { break; } if ((colorset & 0x80) == 0x80) { result.setRGB(x * 8 + sh, y, Color.white.getRGB()); } else { result.setRGB(x * 8 + sh, y, Color.black.getRGB()); } colorset <<= 1; } } } } break; case PNGEncoder.GREYSCALE_MODE: { byte[] row = new byte[width]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < width; x++) { color = row[x]; result.setRGB(x, y, (color << 16) + (color << 8) + color); } } } break; case PNGEncoder.COLOR_MODE: { byte[] row = new byte[width * 3]; for (int y = 0; y < height; y++) { inflater.inflate(new byte[1]); inflater.inflate(row); for (int x = 0; x < width; x++) { result.setRGB(x, y, ((row[x * 3 + 0] & 0xff) << 16) + ((row[x * 3 + 1] & 0xff) << 8) + ((row[x * 3 + 2] & 0xff))); } } } } } catch (DataFormatException e) { throw (new RuntimeException("ZIP error" + e)); } readInt();//!!crc readInt();//0 byte[] iend = read(4); checkEquality(iend, "IEND".getBytes()); readInt();//!!crc in.close(); return (result); } /** * Decodes image from file. * @param fileName a file to read image from * @return a BufferedImage instance. */ public static BufferedImage decode(String fileName) { try { return (new PNGDecoder(new FileInputStream(fileName)).decode()); } catch (IOException e) { throw (new RuntimeException("IOException during image reading" + e)); } } } class PNGEncoder extends Object { /** black and white image mode. */ public static final byte BW_MODE = 0; /** grey scale image mode. */ public static final byte GREYSCALE_MODE = 1; /** full color image mode. */ public static final byte COLOR_MODE = 2; OutputStream out; CRC32 crc; byte mode; /** public constructor of PNGEncoder class with greyscale mode by default. * @param out output stream for PNG image format to write into */ public PNGEncoder(OutputStream out) { this(out, GREYSCALE_MODE); } /** public constructor of PNGEncoder class. * @param out output stream for PNG image format to write into * @param mode BW_MODE, GREYSCALE_MODE or COLOR_MODE */ public PNGEncoder(OutputStream out, byte mode) { crc = new CRC32(); this.out = out; if (mode < 0 || mode > 2) throw new IllegalArgumentException("Unknown color mode"); this.mode = mode; } void write(int i) throws IOException { byte b[] = { (byte) ((i >> 24) & 0xff), (byte) ((i >> 16) & 0xff), (byte) ((i >> 8) & 0xff), (byte) (i & 0xff) }; write(b); } void write(byte b[]) throws IOException { out.write(b); crc.update(b); } /** main encoding method (stays blocked till encoding is finished). * @param image BufferedImage to encode * @throws IOException IOException */ public void encode(BufferedImage image) throws IOException { int width = image.getWidth(null); int height = image.getHeight(null); final byte id[] = { -119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13 }; write(id); crc.reset(); write("IHDR".getBytes()); write(width); write(height); byte head[] = null; switch (mode) { case BW_MODE: head = new byte[] { 1, 0, 0, 0, 0 }; break; case GREYSCALE_MODE: head = new byte[] { 8, 0, 0, 0, 0 }; break; case COLOR_MODE: head = new byte[] { 8, 2, 0, 0, 0 }; break; } write(head); write((int) crc.getValue()); ByteArrayOutputStream compressed = new ByteArrayOutputStream(65536); BufferedOutputStream bos = new BufferedOutputStream(new DeflaterOutputStream(compressed, new Deflater(9))); int pixel; int color; int colorset; switch (mode) { case BW_MODE: int rest = width % 8; int bytes = width / 8; for (int y = 0; y < height; y++) { bos.write(0); for (int x = 0; x < bytes; x++) { colorset = 0; for (int sh = 0; sh < 8; sh++) { pixel = image.getRGB(x * 8 + sh, y); color = ((pixel >> 16) & 0xff); color += ((pixel >> 8) & 0xff); color += (pixel & 0xff); colorset <<= 1; if (color >= 3 * 128) colorset |= 1; } bos.write((byte) colorset); } if (rest > 0) { colorset = 0; for (int sh = 0; sh < width % 8; sh++) { pixel = image.getRGB(bytes * 8 + sh, y); color = ((pixel >> 16) & 0xff); color += ((pixel >> 8) & 0xff); color += (pixel & 0xff); colorset <<= 1; if (color >= 3 * 128) colorset |= 1; } colorset <<= 8 - rest; bos.write((byte) colorset); } } break; case GREYSCALE_MODE: for (int y = 0; y < height; y++) { bos.write(0); for (int x = 0; x < width; x++) { pixel = image.getRGB(x, y); color = ((pixel >> 16) & 0xff); color += ((pixel >> 8) & 0xff); color += (pixel & 0xff); bos.write((byte) (color / 3)); } } break; case COLOR_MODE: for (int y = 0; y < height; y++) { bos.write(0); for (int x = 0; x < width; x++) { pixel = image.getRGB(x, y); bos.write((byte) ((pixel >> 16) & 0xff)); bos.write((byte) ((pixel >> 8) & 0xff)); bos.write((byte) (pixel & 0xff)); } } break; } bos.close(); write(compressed.size()); crc.reset(); write("IDAT".getBytes()); write(compressed.toByteArray()); write((int) crc.getValue()); write(0); crc.reset(); write("IEND".getBytes()); write((int) crc.getValue()); out.close(); } /** Static method performing screen capture into PNG image format file with given fileName. * @param rect Rectangle of screen to be captured * @param fileName file name for screen capture PNG image file */ public static void captureScreen(Rectangle rect, String fileName) { captureScreen(rect, fileName, GREYSCALE_MODE); } /** Static method performing screen capture into PNG image format file with given fileName. * @param rect Rectangle of screen to be captured * @param mode image color mode * @param fileName file name for screen capture PNG image file */ public static void captureScreen(Rectangle rect, String fileName, byte mode) { try { BufferedImage capture = new Robot().createScreenCapture(rect); BufferedOutputStream file = new BufferedOutputStream(new FileOutputStream(fileName)); PNGEncoder encoder = new PNGEncoder(file, mode); encoder.encode(capture); } catch (AWTException awte) { awte.printStackTrace(); } catch (IOException ioe) { ioe.printStackTrace(); } } /** Static method performing one component screen capture into PNG image format file with given fileName. * @param comp Component to be captured * @param fileName String image target filename */ public static void captureScreen(Component comp, String fileName) { captureScreen(comp, fileName, GREYSCALE_MODE); } /** Static method performing one component screen capture into PNG image format file with given fileName. * @param comp Component to be captured * @param fileName String image target filename * @param mode image color mode */ public static void captureScreen(Component comp, String fileName, byte mode) { captureScreen(new Rectangle(comp.getLocationOnScreen(), comp.getSize()), fileName, mode); } /** Static method performing whole screen capture into PNG image format file with given fileName. * @param fileName String image target filename */ public static void captureScreen(String fileName) { captureScreen(fileName, GREYSCALE_MODE); } /** Static method performing whole screen capture into PNG image format file with given fileName. * @param fileName String image target filename * @param mode image color mode */ public static void captureScreen(String fileName, byte mode) { captureScreen(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()), fileName, mode); } }