1 /*
   2  * Copyright (c) 1997, 2015, 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.AWTError;
  29 import java.awt.GraphicsConfiguration;
  30 import java.awt.GraphicsDevice;
  31 import java.awt.peer.ComponentPeer;
  32 import java.lang.ref.WeakReference;
  33 import java.util.ArrayList;
  34 import java.util.ListIterator;
  35 
  36 import sun.awt.windows.WToolkit;
  37 import sun.java2d.SunGraphicsEnvironment;
  38 import sun.java2d.SurfaceManagerFactory;
  39 import sun.java2d.WindowsSurfaceManagerFactory;
  40 import sun.java2d.d3d.D3DGraphicsDevice;
  41 import sun.java2d.windows.WindowsFlags;
  42 
  43 /**
  44  * This is an implementation of a GraphicsEnvironment object for the
  45  * default local GraphicsEnvironment used by the Java Runtime Environment
  46  * for Windows.
  47  *
  48  * @see GraphicsDevice
  49  * @see GraphicsConfiguration
  50  */
  51 
  52 public final class Win32GraphicsEnvironment extends SunGraphicsEnvironment {
  53 
  54     static {
  55         // Ensure awt is loaded already.  Also, this forces static init
  56         // of WToolkit and Toolkit, which we depend upon
  57         WToolkit.loadLibraries();
  58         // setup flags before initializing native layer
  59         WindowsFlags.initFlags();
  60         initDisplayWrapper();
  61 
  62         // Install correct surface manager factory.
  63         SurfaceManagerFactory.setInstance(new WindowsSurfaceManagerFactory());
  64     }
  65 
  66     /**
  67      * Initializes native components of the graphics environment.  This
  68      * includes everything from the native GraphicsDevice elements to
  69      * the DirectX rendering layer.
  70      */
  71     private static native void initDisplay();
  72 
  73     private static boolean displayInitialized;      // = false;
  74     public static void initDisplayWrapper() {
  75         if (!displayInitialized) {
  76             displayInitialized = true;
  77             initDisplay();
  78         }
  79     }
  80 
  81     public Win32GraphicsEnvironment() {
  82     }
  83 
  84     protected native int getNumScreens();
  85     private native int getDefaultScreen();
  86 
  87     public GraphicsDevice getDefaultScreenDevice() {
  88         GraphicsDevice[] screens = getScreenDevices();
  89         if (screens.length == 0) {
  90             throw new AWTError("no screen devices");
  91         }
  92         int index = getDefaultScreen();
  93         return screens[0 < index && index < screens.length ? index : 0];
  94     }
  95 
  96     /**
  97      * Returns the number of pixels per logical inch along the screen width.
  98      * In a system with multiple display monitors, this value is the same for
  99      * all monitors.
 100      * @return number of pixels per logical inch in X direction
 101      */
 102     public native int getXResolution();
 103     /**
 104      * Returns the number of pixels per logical inch along the screen height.
 105      * In a system with multiple display monitors, this value is the same for
 106      * all monitors.
 107      * @return number of pixels per logical inch in Y direction
 108      */
 109     public native int getYResolution();
 110 
 111 
 112 /*
 113  * ----DISPLAY CHANGE SUPPORT----
 114  */
 115 
 116     // list of invalidated graphics devices (those which were removed)
 117     private ArrayList<WeakReference<Win32GraphicsDevice>> oldDevices;
 118     /*
 119      * From DisplayChangeListener interface.
 120      * Called from WToolkit and executed on the event thread when the
 121      * display settings are changed.
 122      */
 123     @Override
 124     public void displayChanged() {
 125         // getNumScreens() will return the correct current number of screens
 126         GraphicsDevice newDevices[] = new GraphicsDevice[getNumScreens()];
 127         GraphicsDevice oldScreens[] = screens;
 128         // go through the list of current devices and determine if they
 129         // could be reused, or will have to be replaced
 130         if (oldScreens != null) {
 131             for (int i = 0; i < oldScreens.length; i++) {
 132                 if (!(screens[i] instanceof Win32GraphicsDevice)) {
 133                     // REMIND: can we ever have anything other than Win32GD?
 134                     assert (false) : oldScreens[i];
 135                     continue;
 136                 }
 137                 Win32GraphicsDevice gd = (Win32GraphicsDevice)oldScreens[i];
 138                 // devices may be invalidated from the native code when the
 139                 // display change happens (device add/removal also causes a
 140                 // display change)
 141                 if (!gd.isValid()) {
 142                     if (oldDevices == null) {
 143                         oldDevices =
 144                             new ArrayList<WeakReference<Win32GraphicsDevice>>();
 145                     }
 146                     oldDevices.add(new WeakReference<Win32GraphicsDevice>(gd));
 147                 } else if (i < newDevices.length) {
 148                     // reuse the device
 149                     newDevices[i] = gd;
 150                 }
 151             }
 152             oldScreens = null;
 153         }
 154         // create the new devices (those that weren't reused)
 155         for (int i = 0; i < newDevices.length; i++) {
 156             if (newDevices[i] == null) {
 157                 newDevices[i] = makeScreenDevice(i);
 158             }
 159         }
 160         // install the new array of devices
 161         // Note: no synchronization here, it doesn't matter if a thread gets
 162         // a new or an old array this time around
 163         screens = newDevices;
 164         for (GraphicsDevice gd : screens) {
 165             if (gd instanceof DisplayChangedListener) {
 166                 ((DisplayChangedListener)gd).displayChanged();
 167             }
 168         }
 169         // re-invalidate all old devices. It's needed because those in the list
 170         // may become "invalid" again - if the current default device is removed,
 171         // for example. Also, they need to be notified about display
 172         // changes as well.
 173         if (oldDevices != null) {
 174             int defScreen = getDefaultScreen();
 175             for (ListIterator<WeakReference<Win32GraphicsDevice>> it =
 176                     oldDevices.listIterator(); it.hasNext();)
 177             {
 178                 Win32GraphicsDevice gd = it.next().get();
 179                 if (gd != null) {
 180                     gd.invalidate(defScreen);
 181                     gd.displayChanged();
 182                 } else {
 183                     // no more references to this device, remove it
 184                     it.remove();
 185                 }
 186             }
 187         }
 188         // Reset the static GC for the (possibly new) default screen
 189         WToolkit.resetGC();
 190 
 191         // notify SunDisplayChanger list (e.g. VolatileSurfaceManagers and
 192         // CachingSurfaceManagers) about the display change event
 193         displayChanger.notifyListeners();
 194         // note: do not call super.displayChanged, we've already done everything
 195     }
 196 
 197 
 198 /*
 199  * ----END DISPLAY CHANGE SUPPORT----
 200  */
 201 
 202     protected GraphicsDevice makeScreenDevice(int screennum) {
 203         GraphicsDevice device = null;
 204         if (WindowsFlags.isD3DEnabled()) {
 205             device = D3DGraphicsDevice.createDevice(screennum);
 206         }
 207         if (device == null) {
 208             device = new Win32GraphicsDevice(screennum);
 209         }
 210         return device;
 211     }
 212 
 213     public boolean isDisplayLocal() {
 214         return true;
 215     }
 216 
 217     @Override
 218     public boolean isFlipStrategyPreferred(ComponentPeer peer) {
 219         GraphicsConfiguration gc;
 220         if (peer != null && (gc = peer.getGraphicsConfiguration()) != null) {
 221             GraphicsDevice gd = gc.getDevice();
 222             if (gd instanceof D3DGraphicsDevice) {
 223                 return ((D3DGraphicsDevice)gd).isD3DEnabledOnDevice();
 224             }
 225         }
 226         return false;
 227     }
 228 
 229     private static volatile boolean isDWMCompositionEnabled;
 230     /**
 231      * Returns true if dwm composition is currently enabled, false otherwise.
 232      *
 233      * @return true if dwm composition is enabled, false otherwise
 234      */
 235     public static boolean isDWMCompositionEnabled() {
 236         return isDWMCompositionEnabled;
 237     }
 238 
 239     /**
 240      * Called from the native code when DWM composition state changed.
 241      * May be called multiple times during the lifetime of the application.
 242      * REMIND: we may want to create a listener mechanism for this.
 243      *
 244      * Note: called on the Toolkit thread, no user code or locks are allowed.
 245      *
 246      * @param enabled indicates the state of dwm composition
 247      */
 248     private static void dwmCompositionChanged(boolean enabled) {
 249         isDWMCompositionEnabled = enabled;
 250     }
 251 
 252     /**
 253      * Used to find out if the OS is Windows Vista or later.
 254      *
 255      * @return {@code true} if the OS is Vista or later, {@code false} otherwise
 256      */
 257     public static native boolean isVistaOS();
 258 }