1 /* 2 * Copyright (c) 2002, 2007, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.java2d; 27 28 import java.awt.Rectangle; 29 import java.awt.image.Raster; 30 import java.awt.image.ColorModel; 31 import java.awt.GraphicsConfiguration; 32 33 import sun.java2d.StateTrackable.State; 34 import sun.java2d.loops.SurfaceType; 35 import sun.java2d.pipe.NullPipe; 36 37 /** 38 * This class provides an empty implementation of the SurfaceData 39 * abstract superclass. All operations on it translate into NOP 40 * or harmless operations. 41 */ 42 public class NullSurfaceData extends SurfaceData { 43 public static final SurfaceData theInstance = new NullSurfaceData(); 44 45 private NullSurfaceData() { 46 super(State.IMMUTABLE, SurfaceType.Any, ColorModel.getRGBdefault()); 47 } 48 49 /** 50 * Sets this SurfaceData object to the invalid state. All Graphics 51 * objects must get a new SurfaceData object via the refresh method 52 * and revalidate their pipelines before continuing. 53 */ 54 public void invalidate() { 55 } 56 57 /** 58 * Return a new SurfaceData object that represents the current state 59 * of the destination that this SurfaceData object describes. 60 * This method is typically called when the SurfaceData is invalidated. 61 */ 62 public SurfaceData getReplacement() { 63 return this; 64 } 65 66 private final static NullPipe nullpipe = new NullPipe(); 67 68 public void validatePipe(SunGraphics2D sg2d) { 69 sg2d.drawpipe = nullpipe; 70 sg2d.fillpipe = nullpipe; 71 sg2d.shapepipe = nullpipe; 72 sg2d.textpipe = nullpipe; 73 sg2d.imagepipe = nullpipe; 74 } 75 76 public GraphicsConfiguration getDeviceConfiguration() { 77 return null; 78 } 79 80 /** 81 * Return a readable Raster which contains the pixels for the 82 * specified rectangular region of the destination surface. 83 * The coordinate origin of the returned Raster is the same as 84 * the device space origin of the destination surface. 85 * In some cases the returned Raster might also be writeable. 86 * In most cases, the returned Raster might contain more pixels 87 * than requested. 88 * 89 * @see #useTightBBoxes 90 */ 91 public Raster getRaster(int x, int y, int w, int h) { 92 throw new InvalidPipeException("should be NOP"); 93 } 94 95 /** 96 * Does the pixel accessibility of the destination surface 97 * suggest that rendering algorithms might want to take 98 * extra time to calculate a more accurate bounding box for 99 * the operation being performed? 100 * The typical case when this will be true is when a copy of 101 * the pixels has to be made when doing a getRaster. The 102 * fewer pixels copied, the faster the operation will go. 103 * 104 * @see #getRaster 105 */ 106 public boolean useTightBBoxes() { 107 return false; 108 } 109 110 /** 111 * Returns the pixel data for the specified Argb value packed 112 * into an integer for easy storage and conveyance. 113 */ 114 public int pixelFor(int rgb) { 115 return rgb; 116 } 117 118 /** 119 * Returns the Argb representation for the specified integer value 120 * which is packed in the format of the associated ColorModel. 121 */ 122 public int rgbFor(int pixel) { 123 return pixel; 124 } 125 126 /** 127 * Returns the bounds of the destination surface. 128 */ 129 public Rectangle getBounds() { 130 return new Rectangle(); 131 } 132 133 /** 134 * Performs Security Permissions checks to see if a Custom 135 * Composite object should be allowed access to the pixels 136 * of this surface. 137 */ 138 protected void checkCustomComposite() { 139 return; 140 } 141 142 /** 143 * Performs a copyarea within this surface. Returns 144 * false if there is no algorithm to perform the copyarea 145 * given the current settings of the SunGraphics2D. 146 */ 147 public boolean copyArea(SunGraphics2D sg2d, 148 int x, int y, int w, int h, int dx, int dy) 149 { 150 return true; 151 } 152 153 /** 154 * Returns destination Image associated with this SurfaceData (null) 155 */ 156 public Object getDestination() { 157 return null; 158 } 159 }