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The osx x86_64 swt jar as available in the Eclipse 4.6 (Neon) release for OSX. It is suitable for use with jface and other dependencies available from maven central in the org.eclipse.scout.sdk.deps group. The sources is copied from swt-4.6-cocoa-macosx-x86_64.zip from http://download.eclipse.org/eclipse/downloads/drops4/R-4.6-201606061100/ and javadoc is generated from sources.

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/*******************************************************************************
 * Copyright (c) 2000, 2012 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.graphics;


/**
 * Implementers of Drawable can have a graphics context (GC)
 * created for them, and then they can be drawn on by sending messages to
 * their associated GC. SWT images, and device objects such as the Display
 * device and the Printer device, are drawables.
 * 
 * IMPORTANT: This interface is not part of the SWT
 * public API. It is marked public only so that it can be shared
 * within the packages provided by SWT. It should never be
 * referenced from application code.
 * 
 *
 * @see Device
 * @see Image
 * @see GC
 */
public interface Drawable {

/**
 * Invokes platform specific functionality to allocate a new GC handle.
 * 
 * IMPORTANT: This method is not part of the public
 * API for Drawable. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * 
 *
 * @param data the platform specific GC data
 * @return the platform specific GC handle
 *
 * @noreference This method is not intended to be referenced by clients.
 */

public long /*int*/ internal_new_GC (GCData data);

/**
 * Invokes platform specific functionality to dispose a GC handle.
 * 
 * IMPORTANT: This method is not part of the public
 * API for Drawable. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * 
 *
 * @param handle the platform specific GC handle
 * @param data the platform specific GC data
 *
 * @noreference This method is not intended to be referenced by clients.
 */
public void internal_dispose_GC (long /*int*/ handle, GCData data);

}