JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2007, 2008, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.java2d.pipe.hw;

import java.awt.BufferCapabilities;
import java.awt.ImageCapabilities;

/**
 * Provides extended BufferStrategy capabilities, allowing to specify
 * the type of vertical refresh synchronization for a buffer strategy.
 *
 * This BS capability is always page flipping because v-sync is only relevant
 * to flipping buffer strategies.
 *
 * Note that asking for a v-synced BS doesn't necessarily guarantee that it will
 * be v-synced since the vsync capability may be disabled in the driver, or
 * there may be other restriction (like a number of v-synced buffer strategies
 * allowed per vm). Because of this {@code createBufferStrategy} doesn't
 * throw {@code AWTException} when a v-synced BS could not be created when
 * requested.
 *
 * @see java.awt.Canvas#createBufferStrategy(int, BufferCapabilities)
 * @see java.awt.Window#createBufferStrategy(int, BufferCapabilities)
 */
public class ExtendedBufferCapabilities extends BufferCapabilities {

    /**
     * Type of synchronization on vertical retrace.
     */
    public static enum VSyncType {
        /**
         * Use the default v-sync mode appropriate for given BufferStrategy
         * and situation.
         */
        VSYNC_DEFAULT(0),

        /**
         * Synchronize flip on vertical retrace.
         */
        VSYNC_ON(1),

        /**
         * Do not synchronize flip on vertical retrace.
         */
        VSYNC_OFF(2);

        /**
         * Used to identify the v-sync type (independent of the constants
         * order as opposed to {@code ordinal()}).
         */
        public int id() {
            return id;
        }

        private VSyncType(int id) {
            this.id = id;
        }
        private int id;
    }

    private VSyncType vsync;

    /**
     * Creates an ExtendedBufferCapabilities object with front/back/flip caps
     * from the passed cap, and VSYNC_DEFAULT v-sync mode.
     */
    public ExtendedBufferCapabilities(BufferCapabilities caps) {
        super(caps.getFrontBufferCapabilities(),
              caps.getBackBufferCapabilities(),
              caps.getFlipContents());

        this.vsync = VSyncType.VSYNC_DEFAULT;
    }

    /**
     * Creates an ExtendedBufferCapabilities instance with front/back/flip caps
     * from the passed caps, and VSYNC_DEFAULT v-sync mode.
     */
    public ExtendedBufferCapabilities(ImageCapabilities front,
                                      ImageCapabilities back, FlipContents flip)
    {
        super(front, back, flip);

        this.vsync = VSyncType.VSYNC_DEFAULT;
    }

    /**
     * Creates an ExtendedBufferCapabilities instance with front/back/flip caps
     * from the passed image/flip caps, and the v-sync type.
     */
    public ExtendedBufferCapabilities(ImageCapabilities front,
                                      ImageCapabilities back, FlipContents flip,
                                      VSyncType t)
    {
        super(front, back, flip);

        this.vsync = t;
    }

    /**
     * Creates an ExtendedBufferCapabilities instance with front/back/flip caps
     * from the passed cap, and the passed v-sync mode.
     */
    public ExtendedBufferCapabilities(BufferCapabilities caps, VSyncType t) {
        super(caps.getFrontBufferCapabilities(),
              caps.getBackBufferCapabilities(),
              caps.getFlipContents());

        this.vsync = t;
    }


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