J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2002-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 | } |