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 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.

 * 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package sun.awt;

import java.awt.AWTPermission;

import java.awt.DisplayMode;

import java.awt.GraphicsConfiguration;

import java.awt.GraphicsDevice;

import java.awt.Insets;

import java.awt.Window;

import java.util.Objects;

import sun.java2d.SunGraphicsEnvironment;

import sun.java2d.opengl.CGLGraphicsConfig;

public final class CGraphicsDevice extends GraphicsDevice

        implements DisplayChangedListener {

    /**

     * CoreGraphics display ID. This identifier can become non-valid at any time

     * therefore methods, which is using this id should be ready to it.

     */

    private volatile int displayID;

    private volatile double xResolution;

    private volatile double yResolution;

    private volatile int scale;

    // Array of all GraphicsConfig instances for this device

    private final GraphicsConfiguration[] configs;

    // Default config (temporarily hard coded)

    private final int DEFAULT_CONFIG = 0;

    private static AWTPermission fullScreenExclusivePermission;

    // Save/restore DisplayMode for the Full Screen mode

    private DisplayMode originalMode;

    public CGraphicsDevice(final int displayID) {

        this.displayID = displayID;

        configs = new GraphicsConfiguration[] {

            CGLGraphicsConfig.getConfig(this, 0)

        };

    }

    /**

     * Returns CGDirectDisplayID, which is the same id as @"NSScreenNumber" in

     * NSScreen.

     *

     * @return CoreGraphics display id.

     */

    public int getCGDisplayID() {

        return displayID;

    }

    /**

     * Return a list of all configurations.

     */

    @Override

    public GraphicsConfiguration[] getConfigurations() {

        return configs.clone();

    }

    /**

     * Return the default configuration.

     */

    @Override

    public GraphicsConfiguration getDefaultConfiguration() {

        return configs[DEFAULT_CONFIG];

    }

    /**

     * Return a human-readable screen description.

     */

    @Override

    public String getIDstring() {

        return "Display " + displayID;

    }

    /**

     * Returns the type of the graphics device.

     * @see #TYPE_RASTER_SCREEN

     * @see #TYPE_PRINTER

     * @see #TYPE_IMAGE_BUFFER

     */

    @Override

    public int getType() {

        return TYPE_RASTER_SCREEN;

    }

    public double getXResolution() {

        return xResolution;

    }

    public double getYResolution() {

        return yResolution;

    }

    public Insets getScreenInsets() {

        // the insets are queried synchronously and are not cached

        // since there are no Quartz or Cocoa means to receive notifications

        // on insets changes (e.g. when the Dock is resized):

        // the existing CGDisplayReconfigurationCallBack is not notified

        // as well as the NSApplicationDidChangeScreenParametersNotification

        // is fired on the Dock location changes only

        return nativeGetScreenInsets(displayID);

    }

    public int getScaleFactor() {

        return scale;

    }

    public void invalidate(final int defaultDisplayID) {

        displayID = defaultDisplayID;

    }

    @Override

    public void displayChanged() {

        xResolution = nativeGetXResolution(displayID);

        yResolution = nativeGetYResolution(displayID);

        initScaleFactor();

        //TODO configs/fullscreenWindow/modes?

    }

    @Override

    public void paletteChanged() {

        // devices do not need to react to this event.

    }

    /**

     * Enters full-screen mode, or returns to windowed mode.

     */

    @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);

            if (originalMode != null) {

                setDisplayMode(originalMode);

                originalMode = null;

            }

        }

        super.setFullScreenWindow(w);

        if (fsSupported && w != null) {

            if (isDisplayChangeSupported()) {

                originalMode = getDisplayMode();

            }

            // enter fullscreen mode

            enterFullScreenExclusive(w);

        }

    }

    /**

     * Returns true if this GraphicsDevice supports

     * full-screen exclusive mode and false otherwise.

     */

    @Override

    public boolean isFullScreenSupported() {

        return isFSExclusiveModeAllowed();

    }

    private static boolean isFSExclusiveModeAllowed() {

        SecurityManager security = System.getSecurityManager();

        if (security != null) {

            if (fullScreenExclusivePermission == null) {

                fullScreenExclusivePermission =

                    new AWTPermission("fullScreenExclusive");

            }

            try {

                security.checkPermission(fullScreenExclusivePermission);

            } catch (SecurityException e) {

                return false;

            }

        }

        return true;

    }

    private static void enterFullScreenExclusive(Window w) {

        FullScreenCapable peer = AWTAccessor.getComponentAccessor().getPeer(w);

        if (peer != null) {

            peer.enterFullScreenMode();

        }

    }

    private static void exitFullScreenExclusive(Window w) {

        FullScreenCapable peer = AWTAccessor.getComponentAccessor().getPeer(w);

        if (peer != null) {

            peer.exitFullScreenMode();

        }

    }

    @Override

    public boolean isDisplayChangeSupported() {

        return true;

    }

    @Override

    public void setDisplayMode(final DisplayMode dm) {

        if (dm == null) {

            throw new IllegalArgumentException("Invalid display mode");

        }

        if (!Objects.equals(dm, getDisplayMode())) {

            nativeSetDisplayMode(displayID, dm.getWidth(), dm.getHeight(),

                    dm.getBitDepth(), dm.getRefreshRate());

            if (isFullScreenSupported() && getFullScreenWindow() != null) {

                getFullScreenWindow().setSize(dm.getWidth(), dm.getHeight());

            }

        }

    }

    @Override

    public DisplayMode getDisplayMode() {

        return nativeGetDisplayMode(displayID);

    }

    @Override

    public DisplayMode[] getDisplayModes() {

        return nativeGetDisplayModes(displayID);

    }

    private void initScaleFactor() {

        if (SunGraphicsEnvironment.isUIScaleEnabled()) {

            double debugScale = SunGraphicsEnvironment.getDebugScale();

            scale = (int) (debugScale >= 1

                    ? Math.round(debugScale)

                    : nativeGetScaleFactor(displayID));

        } else {

            scale = 1;

        }

    }

    private static native double nativeGetScaleFactor(int displayID);

    private static native void nativeSetDisplayMode(int displayID, int w, int h, int bpp, int refrate);

    private static native DisplayMode nativeGetDisplayMode(int displayID);

    private static native DisplayMode[] nativeGetDisplayModes(int displayID);

    private static native double nativeGetXResolution(int displayID);

    private static native double nativeGetYResolution(int displayID);

    private static native Insets nativeGetScreenInsets(int displayID);

}