/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.awt;

import java.awt.AWTPermission;

import java.awt.DisplayMode;

import java.awt.GraphicsEnvironment;

import java.awt.GraphicsDevice;

import java.awt.GraphicsConfiguration;

import java.awt.Rectangle;

import java.awt.Window;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.HashMap;

import sun.java2d.opengl.GLXGraphicsConfig;

import sun.java2d.loops.SurfaceType;

/**

 * This is an implementation of a GraphicsDevice object for a single

 * X11 screen.

 *

 * @see GraphicsEnvironment

 * @see GraphicsConfiguration

 */

public class X11GraphicsDevice

    extends GraphicsDevice

    implements DisplayChangedListener

{

    int screen;

    HashMap x11ProxyKeyMap = new HashMap();

    private static AWTPermission fullScreenExclusivePermission;

    private static Boolean xrandrExtSupported;

    private final Object configLock = new Object();

    private SunDisplayChanger topLevels = new SunDisplayChanger();

    private DisplayMode origDisplayMode;

    private boolean shutdownHookRegistered;

    public X11GraphicsDevice(int screennum) {

        this.screen = screennum;

    }

    /*

     * Initialize JNI field and method IDs for fields that may be

     * accessed from C.

     */

    private static native void initIDs();

    static {

        if (!GraphicsEnvironment.isHeadless()) {

            initIDs();

        }

    }

    /**

     * Returns the X11 screen of the device.

     */

    public int getScreen() {

        return screen;

    }

    public Object getProxyKeyFor(SurfaceType st) {

        synchronized (x11ProxyKeyMap) {

            Object o = x11ProxyKeyMap.get(st);

            if (o == null) {

                o = new Object();

                x11ProxyKeyMap.put(st, o);

            }

            return o;

        }

    }

    /**

     * Returns the X11 Display of this device.

     * This method is also in MDrawingSurfaceInfo but need it here

     * to be able to allow a GraphicsConfigTemplate to get the Display.

     */

    public native long getDisplay();

    /**

     * Returns the type of the graphics device.

     * @see #TYPE_RASTER_SCREEN

     * @see #TYPE_PRINTER

     * @see #TYPE_IMAGE_BUFFER

     */

    public int getType() {

        return TYPE_RASTER_SCREEN;

    }

    /**

     * Returns the identification string associated with this graphics

     * device.

     */

    public String getIDstring() {

        return ":0."+screen;

    }

    GraphicsConfiguration[] configs;

    GraphicsConfiguration defaultConfig;

    HashSet doubleBufferVisuals;

    /**

     * Returns all of the graphics

     * configurations associated with this graphics device.

     */

    public GraphicsConfiguration[] getConfigurations() {

        if (configs == null) {

            synchronized (configLock) {

                makeConfigurations();

            }

        }

        return configs;

    }

    private void makeConfigurations() {

        if (configs == null) {

            int i = 1;  // Index 0 is always the default config

            int num = getNumConfigs(screen);

            GraphicsConfiguration[] ret = new GraphicsConfiguration[num];

            if (defaultConfig == null) {

                ret [0] = getDefaultConfiguration();

            }

            else {

                ret [0] = defaultConfig;

            }

            boolean glxSupported = X11GraphicsEnvironment.isGLXAvailable();

            boolean dbeSupported = isDBESupported();

            if (dbeSupported && doubleBufferVisuals == null) {

                doubleBufferVisuals = new HashSet();

                getDoubleBufferVisuals(screen);

            }

            for ( ; i < num; i++) {

                int visNum = getConfigVisualId(i, screen);

                int depth = getConfigDepth (i, screen);

                if (glxSupported) {

                    ret[i] = GLXGraphicsConfig.getConfig(this, visNum);

                }

                if (ret[i] == null) {

                    boolean doubleBuffer =

                        (dbeSupported &&

                         doubleBufferVisuals.contains(Integer.valueOf(visNum)));

                    ret[i] = X11GraphicsConfig.getConfig(this, visNum, depth,

                            getConfigColormap(i, screen),

                            doubleBuffer);

                }

            }

            configs = ret;

        }

    }

    /*

     * Returns the number of X11 visuals representable as an

     * X11GraphicsConfig object.

     */

    public native int getNumConfigs(int screen);

    /*

     * Returns the visualid for the given index of graphics configurations.

     */

    public native int getConfigVisualId (int index, int screen);

    /*

     * Returns the depth for the given index of graphics configurations.

     */

    public native int getConfigDepth (int index, int screen);

    /*

     * Returns the colormap for the given index of graphics configurations.

     */

    public native int getConfigColormap (int index, int screen);

    // Whether or not double-buffering extension is supported

    public static native boolean isDBESupported();

    // Callback for adding a new double buffer visual into our set

    private void addDoubleBufferVisual(int visNum) {

        doubleBufferVisuals.add(Integer.valueOf(visNum));

    }

    // Enumerates all visuals that support double buffering

    private native void getDoubleBufferVisuals(int screen);

    /**

     * Returns the default graphics configuration

     * associated with this graphics device.

     */

    public GraphicsConfiguration getDefaultConfiguration() {

        if (defaultConfig == null) {

            synchronized (configLock) {

                makeDefaultConfiguration();

            }

        }

        return defaultConfig;

    }

    private void makeDefaultConfiguration() {

        if (defaultConfig == null) {

            int visNum = getConfigVisualId(0, screen);

            if (X11GraphicsEnvironment.isGLXAvailable()) {

                defaultConfig = GLXGraphicsConfig.getConfig(this, visNum);

                if (X11GraphicsEnvironment.isGLXVerbose()) {

                    if (defaultConfig != null) {

                        System.out.print("OpenGL pipeline enabled");

                    } else {

                        System.out.print("Could not enable OpenGL pipeline");

                    }

                    System.out.println(" for default config on screen " +

                                       screen);

                }

            }

            if (defaultConfig == null) {

                int depth = getConfigDepth(0, screen);

                boolean doubleBuffer = false;

                if (isDBESupported() && doubleBufferVisuals == null) {

                    doubleBufferVisuals = new HashSet();

                    getDoubleBufferVisuals(screen);

                    doubleBuffer =

                        doubleBufferVisuals.contains(Integer.valueOf(visNum));

                }

                defaultConfig = X11GraphicsConfig.getConfig(this, visNum,

                                                            depth, getConfigColormap(0, screen),

                                                            doubleBuffer);

            }

        }

    }

    private static native void enterFullScreenExclusive(long window);

    private static native void exitFullScreenExclusive(long window);

    private static native boolean initXrandrExtension();

    private static native DisplayMode getCurrentDisplayMode(int screen);

    private static native void enumDisplayModes(int screen,

                                                ArrayList<DisplayMode> modes);

    private static native void configDisplayMode(int screen,

                                                 int width, int height,

                                                 int displayMode);

    private static native void resetNativeData(int screen);

    /**

     * Returns true only if:

     *   - the Xrandr extension is present

     *   - the necessary Xrandr functions were loaded successfully

     *   - XINERAMA is not enabled

     */

    private static synchronized boolean isXrandrExtensionSupported() {

        if (xrandrExtSupported == null) {

            xrandrExtSupported =

                Boolean.valueOf(initXrandrExtension());

        }

        return xrandrExtSupported.booleanValue();

    }

    @Override

    public boolean isFullScreenSupported() {

        // REMIND: for now we will only allow fullscreen exclusive mode

        // on the primary screen; we could change this behavior slightly

        // in the future by allowing only one screen to be in fullscreen

        // exclusive mode at any given time...

        boolean fsAvailable = (screen == 0) && isXrandrExtensionSupported();

        if (fsAvailable) {

            SecurityManager security = System.getSecurityManager();

            if (security != null) {

                if (fullScreenExclusivePermission == null) {

                    fullScreenExclusivePermission =

                        new AWTPermission("fullScreenExclusive");

                }

                try {

                    security.checkPermission(fullScreenExclusivePermission);

                } catch (SecurityException e) {

                    return false;

                }

            }

        }

        return fsAvailable;

    }

    @Override

    public boolean isDisplayChangeSupported() {

        return (isFullScreenSupported() && (getFullScreenWindow() != null));

    }

    private static void enterFullScreenExclusive(Window w) {

        X11ComponentPeer peer = (X11ComponentPeer)w.getPeer();

        if (peer != null) {

            enterFullScreenExclusive(peer.getContentWindow());

        }

    }

    private static void exitFullScreenExclusive(Window w) {

        X11ComponentPeer peer = (X11ComponentPeer)w.getPeer();

        if (peer != null) {

            exitFullScreenExclusive(peer.getContentWindow());

        }

    }

    @Override

    public synchronized void setFullScreenWindow(Window w) {

        Window old = getFullScreenWindow();

        if (w == old) {

            return;

        }

        boolean fsSupported = isFullScreenSupported();

        if (fsSupported && old != null) {

            // enter windowed mode (and restore original display mode)

            exitFullScreenExclusive(old);

            setDisplayMode(origDisplayMode);

        }

        super.setFullScreenWindow(w);

        if (fsSupported && w != null) {

            // save original display mode

            if (origDisplayMode == null) {

                origDisplayMode = getDisplayMode();

            }

            // enter fullscreen mode

            enterFullScreenExclusive(w);

        }

    }

    private DisplayMode getDefaultDisplayMode() {

        GraphicsConfiguration gc = getDefaultConfiguration();

        Rectangle r = gc.getBounds();

        return new DisplayMode(r.width, r.height,

                               DisplayMode.BIT_DEPTH_MULTI,

                               DisplayMode.REFRESH_RATE_UNKNOWN);

    }

    @Override

    public synchronized DisplayMode getDisplayMode() {

        if (isFullScreenSupported()) {

            return getCurrentDisplayMode(screen);

        } else {

            if (origDisplayMode == null) {

                origDisplayMode = getDefaultDisplayMode();

            }

            return origDisplayMode;

        }

    }

    @Override

    public synchronized DisplayMode[] getDisplayModes() {

        if (!isFullScreenSupported()) {

            return super.getDisplayModes();

        }

        ArrayList<DisplayMode> modes = new ArrayList<DisplayMode>();

        enumDisplayModes(screen, modes);

        DisplayMode[] retArray = new DisplayMode[modes.size()];

        return modes.toArray(retArray);

    }

    @Override

    public synchronized void setDisplayMode(DisplayMode dm) {

        if (!isDisplayChangeSupported()) {

            super.setDisplayMode(dm);

            return;

        }

        Window w = getFullScreenWindow();

        if (w == null) {

            throw new IllegalStateException("Must be in fullscreen mode " +

                                            "in order to set display mode");

        }

        if (dm == null ||

            (dm = getMatchingDisplayMode(dm)) == null)

        {

            throw new IllegalArgumentException("Invalid display mode");

        }

        if (!shutdownHookRegistered) {

            // register a shutdown hook so that we return to the

            // original DisplayMode when the VM exits (if the application

            // is already in the original DisplayMode at that time, this

            // hook will have no effect)

            shutdownHookRegistered = true;

            Runnable r = new Runnable() {

                public void run() {

                    Window old = getFullScreenWindow();

                    if (old != null) {

                        exitFullScreenExclusive(old);

                        setDisplayMode(origDisplayMode);

                    }

                }

            };

            Thread t = new Thread(r,"Display-Change-Shutdown-Thread-"+screen);

            Runtime.getRuntime().addShutdownHook(t);

        }

        // switch to the new DisplayMode

        configDisplayMode(screen,

                          dm.getWidth(), dm.getHeight(),

                          dm.getRefreshRate());

        // update bounds of the fullscreen window

        w.setBounds(0, 0, dm.getWidth(), dm.getHeight());

        // configDisplayMode() is synchronous, so the display change will be

        // complete by the time we get here (and it is therefore safe to call

        // displayChanged() now)

        ((X11GraphicsEnvironment)

         GraphicsEnvironment.getLocalGraphicsEnvironment()).displayChanged();

    }

    private synchronized DisplayMode getMatchingDisplayMode(DisplayMode dm) {

        if (!isDisplayChangeSupported()) {

            return null;

        }

        DisplayMode[] modes = getDisplayModes();

        for (DisplayMode mode : modes) {

            if (dm.equals(mode) ||

                (dm.getRefreshRate() == DisplayMode.REFRESH_RATE_UNKNOWN &&

                 dm.getWidth() == mode.getWidth() &&

                 dm.getHeight() == mode.getHeight() &&

                 dm.getBitDepth() == mode.getBitDepth()))

            {

                return mode;

            }

        }

        return null;

    }

    /**

     * From the DisplayChangedListener interface; called from

     * X11GraphicsEnvironment when the display mode has been changed.

     */

    public synchronized void displayChanged() {

        // reset the list of configs (and default config)

        defaultConfig = null;

        configs = null;

        doubleBufferVisuals = null;

        // reset the native data structures associated with this device (they

        // will be reinitialized when the GraphicsConfigs are configured)

        resetNativeData(screen);

        // pass on to all top-level windows on this screen

        topLevels.notifyListeners();

    }

    /**

     * From the DisplayChangedListener interface; devices do not need

     * to react to this event.

     */

    public void paletteChanged() {

    }

    /**

     * Add a DisplayChangeListener to be notified when the display settings

     * are changed.  Typically, only top-level containers need to be added

     * to X11GraphicsDevice.

     */

    public void addDisplayChangedListener(DisplayChangedListener client) {

        topLevels.add(client);

    }

    /**

     * Remove a DisplayChangeListener from this X11GraphicsDevice.

     */

    public void removeDisplayChangedListener(DisplayChangedListener client) {

        topLevels.remove(client);

    }

    public String toString() {

        return ("X11GraphicsDevice[screen="+screen+"]");

    }

}