1 /*
   2  * Copyright (c) 1997, 2009, 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.awt;
  27 
  28 import java.awt.GraphicsConfiguration;
  29 import java.awt.GraphicsDevice;
  30 import java.awt.GraphicsEnvironment;
  31 import java.awt.Toolkit;
  32 import java.awt.peer.ComponentPeer;
  33 import java.io.File;
  34 import java.io.IOException;
  35 import java.lang.ref.WeakReference;
  36 import java.util.ArrayList;
  37 import java.util.ListIterator;
  38 import java.util.NoSuchElementException;
  39 import java.util.StringTokenizer;
  40 import sun.awt.DisplayChangedListener;
  41 import sun.awt.SunDisplayChanger;
  42 import sun.awt.windows.WPrinterJob;
  43 import sun.awt.windows.WToolkit;
  44 import sun.java2d.SunGraphicsEnvironment;
  45 import sun.java2d.SurfaceManagerFactory;
  46 import sun.java2d.WindowsSurfaceManagerFactory;
  47 import sun.java2d.d3d.D3DGraphicsDevice;
  48 import sun.java2d.windows.WindowsFlags;
  49 
  50 /**
  51  * This is an implementation of a GraphicsEnvironment object for the
  52  * default local GraphicsEnvironment used by the Java Runtime Environment
  53  * for Windows.
  54  *
  55  * @see GraphicsDevice
  56  * @see GraphicsConfiguration
  57  */
  58 
  59 public class Win32GraphicsEnvironment
  60     extends SunGraphicsEnvironment
  61 {
  62     static {
  63         // Ensure awt is loaded already.  Also, this forces static init
  64         // of WToolkit and Toolkit, which we depend upon
  65         WToolkit.loadLibraries();
  66         // setup flags before initializing native layer
  67         WindowsFlags.initFlags();
  68         initDisplayWrapper();
  69 
  70         // Install correct surface manager factory.
  71         SurfaceManagerFactory.setInstance(new WindowsSurfaceManagerFactory());
  72     }
  73 
  74     /**
  75      * Initializes native components of the graphics environment.  This
  76      * includes everything from the native GraphicsDevice elements to
  77      * the DirectX rendering layer.
  78      */
  79     private static native void initDisplay();
  80 
  81     private static boolean displayInitialized;      // = false;
  82     public static void initDisplayWrapper() {
  83         if (!displayInitialized) {
  84             displayInitialized = true;
  85             initDisplay();
  86         }
  87     }
  88 
  89     public Win32GraphicsEnvironment() {
  90     }
  91 
  92     protected native int getNumScreens();
  93     protected native int getDefaultScreen();
  94 
  95     public GraphicsDevice getDefaultScreenDevice() {
  96         GraphicsDevice[] screens = getScreenDevices();
  97         if (screens.length == 0) {
  98             return null;
  99         }
 100         int index = getDefaultScreen();
 101         return screens[0 < index && index < screens.length ? index : 0];
 102     }
 103 
 104     /**
 105      * Returns the number of pixels per logical inch along the screen width.
 106      * In a system with multiple display monitors, this value is the same for
 107      * all monitors.
 108      * @returns number of pixels per logical inch in X direction
 109      */
 110     public native int getXResolution();
 111     /**
 112      * Returns the number of pixels per logical inch along the screen height.
 113      * In a system with multiple display monitors, this value is the same for
 114      * all monitors.
 115      * @returns number of pixels per logical inch in Y direction
 116      */
 117     public native int getYResolution();
 118 
 119 
 120 /*
 121  * ----DISPLAY CHANGE SUPPORT----
 122  */
 123 
 124     // list of invalidated graphics devices (those which were removed)
 125     private ArrayList<WeakReference<Win32GraphicsDevice>> oldDevices;
 126     /*
 127      * From DisplayChangeListener interface.
 128      * Called from WToolkit and executed on the event thread when the
 129      * display settings are changed.
 130      */
 131     @Override
 132     public void displayChanged() {
 133         // getNumScreens() will return the correct current number of screens
 134         GraphicsDevice newDevices[] = new GraphicsDevice[getNumScreens()];
 135         GraphicsDevice oldScreens[] = screens;
 136         // go through the list of current devices and determine if they
 137         // could be reused, or will have to be replaced
 138         if (oldScreens != null) {
 139             for (int i = 0; i < oldScreens.length; i++) {
 140                 if (!(screens[i] instanceof Win32GraphicsDevice)) {
 141                     // REMIND: can we ever have anything other than Win32GD?
 142                     assert (false) : oldScreens[i];
 143                     continue;
 144                 }
 145                 Win32GraphicsDevice gd = (Win32GraphicsDevice)oldScreens[i];
 146                 // devices may be invalidated from the native code when the
 147                 // display change happens (device add/removal also causes a
 148                 // display change)
 149                 if (!gd.isValid()) {
 150                     if (oldDevices == null) {
 151                         oldDevices =
 152                             new ArrayList<WeakReference<Win32GraphicsDevice>>();
 153                     }
 154                     oldDevices.add(new WeakReference<Win32GraphicsDevice>(gd));
 155                 } else if (i < newDevices.length) {
 156                     // reuse the device
 157                     newDevices[i] = gd;
 158                 }
 159             }
 160             oldScreens = null;
 161         }
 162         // create the new devices (those that weren't reused)
 163         for (int i = 0; i < newDevices.length; i++) {
 164             if (newDevices[i] == null) {
 165                 newDevices[i] = makeScreenDevice(i);
 166             }
 167         }
 168         // install the new array of devices
 169         // Note: no synchronization here, it doesn't matter if a thread gets
 170         // a new or an old array this time around
 171         screens = newDevices;
 172         for (GraphicsDevice gd : screens) {
 173             if (gd instanceof DisplayChangedListener) {
 174                 ((DisplayChangedListener)gd).displayChanged();
 175             }
 176         }
 177         // re-invalidate all old devices. It's needed because those in the list
 178         // may become "invalid" again - if the current default device is removed,
 179         // for example. Also, they need to be notified about display
 180         // changes as well.
 181         if (oldDevices != null) {
 182             int defScreen = getDefaultScreen();
 183             for (ListIterator<WeakReference<Win32GraphicsDevice>> it =
 184                     oldDevices.listIterator(); it.hasNext();)
 185             {
 186                 Win32GraphicsDevice gd = it.next().get();
 187                 if (gd != null) {
 188                     gd.invalidate(defScreen);
 189                     gd.displayChanged();
 190                 } else {
 191                     // no more references to this device, remove it
 192                     it.remove();
 193                 }
 194             }
 195         }
 196         // Reset the static GC for the (possibly new) default screen
 197         WToolkit.resetGC();
 198 
 199         // notify SunDisplayChanger list (e.g. VolatileSurfaceManagers and
 200         // CachingSurfaceManagers) about the display change event
 201         displayChanger.notifyListeners();
 202         // note: do not call super.displayChanged, we've already done everything
 203     }
 204 
 205 
 206 /*
 207  * ----END DISPLAY CHANGE SUPPORT----
 208  */
 209 
 210     protected GraphicsDevice makeScreenDevice(int screennum) {
 211         GraphicsDevice device = null;
 212         if (WindowsFlags.isD3DEnabled()) {
 213             device = D3DGraphicsDevice.createDevice(screennum);
 214         }
 215         if (device == null) {
 216             device = new Win32GraphicsDevice(screennum);
 217         }
 218         return device;
 219     }
 220 
 221     public boolean isDisplayLocal() {
 222         return true;
 223     }
 224 
 225     @Override
 226     public boolean isFlipStrategyPreferred(ComponentPeer peer) {
 227         GraphicsConfiguration gc;
 228         if (peer != null && (gc = peer.getGraphicsConfiguration()) != null) {
 229             GraphicsDevice gd = gc.getDevice();
 230             if (gd instanceof D3DGraphicsDevice) {
 231                 return ((D3DGraphicsDevice)gd).isD3DEnabledOnDevice();
 232             }
 233         }
 234         return false;
 235     }
 236 
 237     private static volatile boolean isDWMCompositionEnabled;
 238     /**
 239      * Returns true if dwm composition is currently enabled, false otherwise.
 240      *
 241      * @return true if dwm composition is enabled, false otherwise
 242      */
 243     public static boolean isDWMCompositionEnabled() {
 244         return isDWMCompositionEnabled;
 245     }
 246 
 247     /**
 248      * Called from the native code when DWM composition state changed.
 249      * May be called multiple times during the lifetime of the application.
 250      * REMIND: we may want to create a listener mechanism for this.
 251      *
 252      * Note: called on the Toolkit thread, no user code or locks are allowed.
 253      *
 254      * @param enabled indicates the state of dwm composition
 255      */
 256     private static void dwmCompositionChanged(boolean enabled) {
 257         isDWMCompositionEnabled = enabled;
 258     }
 259 
 260     /**
 261      * Used to find out if the OS is Windows Vista or later.
 262      *
 263      * @return {@code true} if the OS is Vista or later, {@code false} otherwise
 264      */
 265     public static native boolean isVistaOS();
 266 }