http://openjdk.java.net/projects/openjfx/javafx-web/: OpenJFX JavaFX
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/*
 * Copyright (c) 2011, 2014, 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
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package com.sun.webkit.graphics;

public abstract class WCPageBackBuffer extends Ref {
    public abstract WCGraphicsContext createGraphics();

    public abstract void disposeGraphics(WCGraphicsContext gc);

    public abstract void flush(WCGraphicsContext gc, int x, int y, int w, int h);

    protected abstract void copyArea(int x, int y, int w, int h, int dx, int dy);

    
@retursfalse if full page repaint is needed after the validation, true otherwise
/**
     * @returs {@code false} if full page repaint is needed after the validation,
     *         {@code true} otherwise
     */
    public abstract boolean validate(int width, int height);
}