/*******************************************************************************

 * Copyright (c) 2000, 2007 IBM Corporation and others.

 * Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

 * 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

 *     Nokia Corporation - Qt implementation

 *******************************************************************************/

package org.eclipse.swt.internal.qt;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.graphics.Device;

import org.eclipse.swt.graphics.Font;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.internal.qt.graphics.GraphicsContext;

/**

 * Instances of this class are descriptions of GCs in terms

 * of unallocated platform-specific data fields.

 * <p>

 * <b>IMPORTANT:</b> This class is <em>not</em> part of the public

 * API for SWT. 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.

 * </p>

 */

public final class GCData {

	public static final int NOT_DEFINED = -1;

	public static final int XOR_MODE_ON = 1;

	public static final int XOR_MODE_OFF = 0;

	/*

	 * Stroke style mappings

	 */

	static final int [][] StrokeStyleTable = {

		{GraphicsContext.STROKE_SOLID,	      SWT.LINE_SOLID},

		{GraphicsContext.STROKE_DASH,	      SWT.LINE_DASH},

		{GraphicsContext.STROKE_DOT,	      SWT.LINE_DOT},

		{GraphicsContext.STROKE_DASH_DOT,     SWT.LINE_DASHDOT},

		{GraphicsContext.STROKE_DASH_DOT_DOT, SWT.LINE_DASHDOTDOT}};

	public Device device;

	public GraphicsContext internalGc;

	public Color foreground;

	public Color background;

	public int drawable; // QPaintDevice

	public int alpha;

	public Font font;

	public int lineStyle;

	public int lineWidth;

	public int style, state;

	public int xorMode;

	public Rectangle clippingRect;

	public boolean buffered;

	public GCData() {

	    drawable = NOT_DEFINED;

	    alpha = 0xFF;

	    lineStyle = NOT_DEFINED;

	    lineWidth = NOT_DEFINED;

	    style = NOT_DEFINED;

	    xorMode = NOT_DEFINED;

	}

	/*

	 * Releases resources

	 */

	public void destroy() {

		internalGc = null;

		device     = null;

		foreground = null;

		background = null;

		drawable   = NOT_DEFINED;

		alpha      = 0xFF;

		font       = null;

		lineStyle  = NOT_DEFINED;

		lineWidth  = NOT_DEFINED;

		style      = NOT_DEFINED;

		xorMode    = NOT_DEFINED;

		clippingRect = null;

	}

	/*

	 * Converts stroke style to and from SWT.

	 * <p>

	 * <b>IMPORTANT:</b> This table is should never be accessed 

	 * from application code.

	 * </p>

	 *

	 * @param style Stroke style

	 * @param fromSWT if true translates the given SWT stroke style

	 * to a corresponding native stroke style and vice versa if 

	 * the <code>fromSWT</code> is false.

	 * @return Translated stroke. 

	 * @throws IllegalArgumentException if no match

	 */

	public static int translateStrokeStyle(int style, boolean fromSWT) {

		int source = 0;

		int target = 1;

		if( fromSWT ) {

			source = 1;

			target = 0;

		}

		for (int i = 0; i < GCData.StrokeStyleTable.length; i++) {

			if (GCData.StrokeStyleTable[i][source] == style) {

				return GCData.StrokeStyleTable[i][target];

			}

		}

		throw new IllegalArgumentException("Invalid style: " + style);

	}

}