Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\prism\PixelSource.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.prism;

import com.sun.glass.ui.Pixels;

/**
 * An interface to facilitate the asynchronous delivery of frames of pixels
 * between threads with support for an arbitrary number of outstanding
 * delivery requests.
 */
public interface PixelSource {
    /**
     * Gets the next "latest" set of {@code Pixels} to be processed or displayed.
     * This method is called by the consumer of Pixels objects.
     * The return value may be null if the delivery request was obsoleted
     * or superceded while in transit between the threads.
     * The caller should call
     * {@link #doneWithPixels(com.sun.glass.ui.Pixels) doneWithPixels()}
     * if and only if the return value was non-null.
     *
     * @return the next Pixels object to process, or null if there is nothing
     *         to process
     */
    public Pixels getLatestPixels();

/**
     * Indicates that the specified non-null {@code Pixels} object which was
     * obtained from {@link #getLatestPixels()} is done being processed and
     * can be reused for future pixel deliveries if needed.
     * This method should be called by the consumer if and only if the call to
     * {@code getLatestPixels()} returned a non-null object.
     *
     * @param used a non-null {@code Pixels} object previously obtained from
     *             {@code getLatestPixels()}
     */
    public void doneWithPixels(Pixels used);

/**
     * A one step method for skipping a pixel delivery object in the case
     * where the consumer is not ready to process any pixels.
     * Examples of cases where this method is used is when deliveries are
     * received for closed, iconified, or disposed windows.
     * This call is equivalent to {@code doneWithPixels(getLatestPixels())}.
     */
    public void skipLatestPixels();
}

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