bundles/org.eclipse.swt/Eclipse SWT/cocoa/org/eclipse/swt/graphics/Color.java - platform/eclipse.platform.swt - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2020 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.swt.graphics;


 import org.eclipse.swt.*;

 /**
  * Instances of this store color information. To create a color you can either
  * specify the individual color components as integers in the range
  * 0 to 255 or provide an instance of an <code>RGB</code> or <code>RGBA</code>.
  * <p>
  * Colors do not need to be disposed, however to maintain compatibility
  * with older code, disposing a Color is not an error.
  * </p>
  *
  * @see RGB
  * @see RGBA
  * @see Device#getSystemColor
  * @see <a href="http://www.eclipse.org/swt/snippets/#color">Color and RGB snippets</a>
  * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: PaintExample</a>
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  */
 public final class Color extends Resource {
 	/**
 	 * the handle to the OS color resource
 	 * (Warning: This field is platform dependent)
 	 * <p>
 	 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
 	 * public API. 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 accessed from application code.
 	 * </p>
 	 *
 	 * @noreference This field is not intended to be referenced by clients.
 	 */
 	public double [] handle;

 Color() {
 	super();
 }

 Color(Device device) {
 	super(device);
 }

 /**
  * Constructs a new instance of this class given a device and the
  * desired red, green and blue values expressed as ints in the range
  * 0 to 255 (where 0 is black and 255 is full brightness).
  *
  * @param device the device on which to allocate the color
  * @param red the amount of red in the color
  * @param green the amount of green in the color
  * @param blue the amount of blue in the color
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
  * </ul>
  */
 public Color(Device device, int red, int green, int blue) {
 	super(device);
 	init(red, green, blue, 255);
 	init();
 }

 /**
  * Constructs a new instance of this class given the
  * desired red, green and blue values expressed as ints in the range
  * 0 to 255 (where 0 is black and 255 is full brightness).
  *
  * @param red the amount of red in the color
  * @param green the amount of green in the color
  * @param blue the amount of blue in the color
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
  * </ul>
  * @since 3.115
  */
 public Color(int red, int green, int blue) {
 	super();
 	init(red, green, blue, 255);
 }

 /**
  * Constructs a new instance of this class given a device and the
  * desired red, green, blue &amp; alpha values expressed as ints in the range
  * 0 to 255 (where 0 is black and 255 is full brightness).
  *
  * @param device the device on which to allocate the color
  * @param red the amount of red in the color
  * @param green the amount of green in the color
  * @param blue the amount of blue in the color
  * @param alpha the amount of alpha in the color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
  * </ul>
  *
  * @since 3.104
  */
 public Color(Device device, int red, int green, int blue, int alpha) {
 	super(device);
 	init(red, green, blue, alpha);
 	init();
 }

 /**
  * Constructs a new instance of this class given the
  * desired red, green, blue &amp; alpha values expressed as ints in the range
  * 0 to 255 (where 0 is black and 255 is full brightness).
  *
  * @param red the amount of red in the color
  * @param green the amount of green in the color
  * @param blue the amount of blue in the color
  * @param alpha the amount of alpha in the color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
  * </ul>
  *
  * @since 3.115
  */
 public Color(int red, int green, int blue, int alpha) {
 	super();
 	init(red, green, blue, alpha);
 }

 /**
  * Constructs a new instance of this class given a device and an
  * <code>RGB</code> describing the desired red, green and blue values.
  *
  * @param device the device on which to allocate the color
  * @param rgb the RGB values of the desired color
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
  *    <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
  * </ul>
  */
 public Color(Device device, RGB rgb) {
 	super(device);
 	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgb.red, rgb.green, rgb.blue, 255);
 	init();
 }

 /**
  * Constructs a new instance of this class given an
  * <code>RGB</code> describing the desired red, green and blue values.
  *
  * @param rgb the RGB values of the desired color
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
  * </ul>
  * @since 3.115
  */
 public Color(RGB rgb) {
 	super();
 	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgb.red, rgb.green, rgb.blue, 255);
 }

 /**
  * Constructs a new instance of this class given a device and an
  * <code>RGBA</code> describing the desired red, green, blue &amp; alpha values.
  *
  * @param device the device on which to allocate the color
  * @param rgba the RGBA values of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
  *    <li>ERROR_NULL_ARGUMENT - if the rgba argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
  * </ul>
  *
  * @since 3.104
  */
 public Color(Device device, RGBA rgba) {
 	super(device);
 	if (rgba == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgba.rgb.red, rgba.rgb.green, rgba.rgb.blue, rgba.alpha);
 	init();
 }

 /**
  * Constructs a new instance of this class given an
  * <code>RGBA</code> describing the desired red, green, blue &amp; alpha values.
  *
  * @param rgba the RGBA values of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the rgba argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
  * </ul>
  *
  * @since 3.115
  */
 public Color(RGBA rgba) {
 	super();
 	if (rgba == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgba.rgb.red, rgba.rgb.green, rgba.rgb.blue, rgba.alpha);
 }

 /**
  * Constructs a new instance of this class given a device, an
  * <code>RGB</code> describing the desired red, green and blue values,
  * alpha specifying the level of transparency.
  *
  * @param device the device on which to allocate the color
  * @param rgb the RGB values of the desired color
  * @param alpha the alpha value of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
  *    <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
  * </ul>
  *
  * @since 3.104
  */
 public Color(Device device, RGB rgb, int alpha) {
 	super(device);
 	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgb.red, rgb.green, rgb.blue, alpha);
 	init();
 }

 /**
  * Constructs a new instance of this class given an
  * <code>RGB</code> describing the desired red, green and blue values,
  * alpha specifying the level of transparency.
  *
  * @param rgb the RGB values of the desired color
  * @param alpha the alpha value of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
  * </ul>
  *
  * @since 3.115
  */
 public Color(RGB rgb, int alpha) {
 	super();
 	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
 	init(rgb.red, rgb.green, rgb.blue, alpha);
 }

 @Override
 void destroy() {
 	handle = null;
 }

 /**
  * Colors do not need to be disposed, however to maintain compatibility
  * with older code, disposing a Color is not an error.
  */
 @Override
 public void dispose() {
 	// Does as below to maintain API contract with Resource. Does
 	// not use super.dispose() because that untracks the Color
 	// from the Device tracking, however init() is overridden
 	// to prevent the tracking in the first place.
 	destroy();
 	device = null;
 }

 /**
  * Returns the <code>Device</code> where this resource was
  * created. In cases where no <code>Device</code> was used
  * at creation, returns the current or default Device.
  *
  * @return <code>Device</code> the device of the receiver
  * @since 3.2
  */
 @Override
 public Device getDevice() {
 	// Fall back on Device.getDevice only if we haven't been disposed
 	// already.
 	if (this.device == null && this.handle != null) return Device.getDevice();
 	return super.getDevice();
 }

 /**
  * Compares the argument to the receiver, and returns true
  * if they represent the <em>same</em> object using a class
  * specific comparison.
  *
  * @param object the object to compare with this object
  * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
  *
  * @see #hashCode
  */
 @Override
 public boolean equals(Object object) {
 	if (object == this) return true;
 	if (!(object instanceof Color)) return false;
 	Color color = (Color)object;
 	double [] rgbColor = color.handle;
 	if (handle == rgbColor) return true;
 	return
 		(int)(handle[0] * 255) == (int)(rgbColor[0] * 255) &&
 		(int)(handle[1] * 255) == (int)(rgbColor[1] * 255) &&
 		(int)(handle[2] * 255) == (int)(rgbColor[2] * 255) &&
 		(int)(handle[3] * 255) == (int)(rgbColor[3] * 255);

 }

 /**
  * Returns the amount of alpha in the color, from 0 (transparent) to 255 (opaque).
  *
  * @return the alpha component of the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  * @since 3.104
  */
 public int getAlpha() {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return (int)(handle[3] * 255);
 }

 /**
  * Returns the amount of blue in the color, from 0 to 255.
  *
  * @return the blue component of the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  */
 public int getBlue() {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return (int)(handle[2] * 255);
 }

 /**
  * Returns the amount of green in the color, from 0 to 255.
  *
  * @return the green component of the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  */
 public int getGreen() {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return (int)(handle[1] * 255);
 }

 /**
  * Returns the amount of red in the color, from 0 to 255.
  *
  * @return the red component of the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  */
 public int getRed() {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return (int)(handle[0] * 255);
 }

 /**
  * Returns an integer hash code for the receiver. Any two
  * objects that return <code>true</code> when passed to
  * <code>equals</code> must return the same value for this
  * method.
  *
  * @return the receiver's hash
  *
  * @see #equals
  */
 @Override
 public int hashCode() {
 	if (isDisposed()) return 0;
 	return (int)(handle[0] * 255) ^ (int)(handle[1] * 255) ^ (int)(handle[2] * 255) ^ (int)(handle[3] * 255);
 }

 /**
  * Returns an <code>RGB</code> representing the receiver.
  *
  * @return the RGB for the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  */
 public RGB getRGB () {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return new RGB(getRed(), getGreen(), getBlue());
 }

 /**
  * Returns an <code>RGBA</code> representing the receiver.
  *
  * @return the RGBA for the color
  *
  * @exception SWTException <ul>
  *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
  * </ul>
  * @since 3.104
  */
 public RGBA getRGBA () {
 	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
 	return new RGBA(getRed(), getGreen(), getBlue(), getAlpha());
 }

 /**
  * Invokes platform specific functionality to allocate a new color.
  * <p>
  * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
  * API for <code>Color</code>. 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>
  *
  * @param device the device on which to allocate the color
  * @param handle the handle for the color
  *
  * @noreference This method is not intended to be referenced by clients.
  */
 public static Color cocoa_new(Device device, double [] handle) {
 	double [] rgbColor = handle;
 	Color color = new Color(device);
 	color.handle = rgbColor;
 	return color;
 }

 /**
  * Invokes platform specific functionality to allocate a new color.
  * <p>
  * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
  * API for <code>Color</code>. 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>
  *
  * @param device the device on which to allocate the color
  * @param handle the handle for the color
  * @param alpha the int for the alpha content in the color(Currently SWT honors extreme values for alpha ie. 0 or 255)
  *
  * @noreference This method is not intended to be referenced by clients.
  */
 public static Color cocoa_new(Device device, double [] handle, int alpha) {
 	double [] rgbColor = handle;
 	Color color = new Color(device);
 	color.handle = rgbColor;
 	color.handle[3] = alpha / 255f;
 	return color;
 }

 /**
  * Allocates the operating system resources associated
  * with the receiver.
  *
  * @param device the device on which to allocate the color
  * @param red the amount of red in the color
  * @param green the amount of green in the color
  * @param blue the amount of blue in the color
  * @param alpha the amount of alpha in the color
  *
  * @exception IllegalArgumentException <ul>
  *    <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
  * </ul>
  */
 void init(int red, int green, int blue, int alpha) {
 	if ((red > 255) || (red < 0) ||
 		(green > 255) || (green < 0) ||
 		(blue > 255) || (blue < 0) ||
 		(alpha > 255) || (alpha < 0)) {
 			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
 	}
 	double [] rgbColor = new double [4];
 	rgbColor[0] = red / 255f;
 	rgbColor[1] = green / 255f;
 	rgbColor[2] = blue / 255f;
 	rgbColor[3] = alpha / 255f;
 	handle = rgbColor;
 }

 @Override
 void init() {
 	// Resource init simply tracks this resource in the Device
 	// if DEBUG is on. Since Colors don't require disposal,
 	// the tracking would be a memory leak and a misreport
 	// on what resources are in use.
 }

 /**
  * Returns <code>true</code> if the color has been disposed,
  * and <code>false</code> otherwise.
  * <p>
  * This method gets the dispose state for the color.
  * When a color has been disposed, it is an error to
  * invoke any other method (except {@link #dispose()}) using the color.
  *
  * @return <code>true</code> when the color is disposed and <code>false</code> otherwise
  */
 @Override
 public boolean isDisposed() {
 	return handle == null;
 }

 /**
  * Returns a string containing a concise, human-readable
  * description of the receiver.
  *
  * @return a string representation of the receiver
  */
 @Override
 public String toString () {
 	if (isDisposed()) return "Color {*DISPOSED*}";
 	return "Color {" + getRed() + ", " + getGreen() + ", " + getBlue() + ", " + getAlpha() + "}";
 }

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2020 IBM Corporation and others.
	*
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.swt.graphics;


	import org.eclipse.swt.*;

	/**
	* Instances of this store color information. To create a color you can either
	* specify the individual color components as integers in the range
	* 0 to 255 or provide an instance of an <code>RGB</code> or <code>RGBA</code>.
	* <p>
	* Colors do not need to be disposed, however to maintain compatibility
	* with older code, disposing a Color is not an error.
	* </p>
	*
	* @see RGB
	* @see RGBA
	* @see Device#getSystemColor
	* @see <a href="http://www.eclipse.org/swt/snippets/#color">Color and RGB snippets</a>
	* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: PaintExample</a>
	* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
	*/
	public final class Color extends Resource {
	/**
	* the handle to the OS color resource
	* (Warning: This field is platform dependent)
	* <p>
	* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
	* public API. 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 accessed from application code.
	* </p>
	*
	* @noreference This field is not intended to be referenced by clients.
	*/
	public double [] handle;

	Color() {
	super();
	}

	Color(Device device) {
	super(device);
	}

	/**
	* Constructs a new instance of this class given a device and the
	* desired red, green and blue values expressed as ints in the range
	* 0 to 255 (where 0 is black and 255 is full brightness).
	*
	* @param device the device on which to allocate the color
	* @param red the amount of red in the color
	* @param green the amount of green in the color
	* @param blue the amount of blue in the color
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
	* </ul>
	*/
	public Color(Device device, int red, int green, int blue) {
	super(device);
	init(red, green, blue, 255);
	init();
	}

	/**
	* Constructs a new instance of this class given the
	* desired red, green and blue values expressed as ints in the range
	* 0 to 255 (where 0 is black and 255 is full brightness).
	*
	* @param red the amount of red in the color
	* @param green the amount of green in the color
	* @param blue the amount of blue in the color
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
	* </ul>
	* @since 3.115
	*/
	public Color(int red, int green, int blue) {
	super();
	init(red, green, blue, 255);
	}

	/**
	* Constructs a new instance of this class given a device and the
	* desired red, green, blue & alpha values expressed as ints in the range
	* 0 to 255 (where 0 is black and 255 is full brightness).
	*
	* @param device the device on which to allocate the color
	* @param red the amount of red in the color
	* @param green the amount of green in the color
	* @param blue the amount of blue in the color
	* @param alpha the amount of alpha in the color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
	* </ul>
	*
	* @since 3.104
	*/
	public Color(Device device, int red, int green, int blue, int alpha) {
	super(device);
	init(red, green, blue, alpha);
	init();
	}

	/**
	* Constructs a new instance of this class given the
	* desired red, green, blue & alpha values expressed as ints in the range
	* 0 to 255 (where 0 is black and 255 is full brightness).
	*
	* @param red the amount of red in the color
	* @param green the amount of green in the color
	* @param blue the amount of blue in the color
	* @param alpha the amount of alpha in the color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
	* </ul>
	*
	* @since 3.115
	*/
	public Color(int red, int green, int blue, int alpha) {
	super();
	init(red, green, blue, alpha);
	}

	/**
	* Constructs a new instance of this class given a device and an
	* <code>RGB</code> describing the desired red, green and blue values.
	*
	* @param device the device on which to allocate the color
	* @param rgb the RGB values of the desired color
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
	* <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
	* </ul>
	*/
	public Color(Device device, RGB rgb) {
	super(device);
	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgb.red, rgb.green, rgb.blue, 255);
	init();
	}

	/**
	* Constructs a new instance of this class given an
	* <code>RGB</code> describing the desired red, green and blue values.
	*
	* @param rgb the RGB values of the desired color
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
	* </ul>
	* @since 3.115
	*/
	public Color(RGB rgb) {
	super();
	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgb.red, rgb.green, rgb.blue, 255);
	}

	/**
	* Constructs a new instance of this class given a device and an
	* <code>RGBA</code> describing the desired red, green, blue & alpha values.
	*
	* @param device the device on which to allocate the color
	* @param rgba the RGBA values of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
	* <li>ERROR_NULL_ARGUMENT - if the rgba argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
	* </ul>
	*
	* @since 3.104
	*/
	public Color(Device device, RGBA rgba) {
	super(device);
	if (rgba == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgba.rgb.red, rgba.rgb.green, rgba.rgb.blue, rgba.alpha);
	init();
	}

	/**
	* Constructs a new instance of this class given an
	* <code>RGBA</code> describing the desired red, green, blue & alpha values.
	*
	* @param rgba the RGBA values of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the rgba argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
	* </ul>
	*
	* @since 3.115
	*/
	public Color(RGBA rgba) {
	super();
	if (rgba == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgba.rgb.red, rgba.rgb.green, rgba.rgb.blue, rgba.alpha);
	}

	/**
	* Constructs a new instance of this class given a device, an
	* <code>RGB</code> describing the desired red, green and blue values,
	* alpha specifying the level of transparency.
	*
	* @param device the device on which to allocate the color
	* @param rgb the RGB values of the desired color
	* @param alpha the alpha value of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
	* <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
	* </ul>
	*
	* @since 3.104
	*/
	public Color(Device device, RGB rgb, int alpha) {
	super(device);
	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgb.red, rgb.green, rgb.blue, alpha);
	init();
	}

	/**
	* Constructs a new instance of this class given an
	* <code>RGB</code> describing the desired red, green and blue values,
	* alpha specifying the level of transparency.
	*
	* @param rgb the RGB values of the desired color
	* @param alpha the alpha value of the desired color. Currently, SWT only honors extreme values for alpha i.e. 0 (transparent) or 255 (opaque).
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha components of the argument are not between 0 and 255</li>
	* </ul>
	*
	* @since 3.115
	*/
	public Color(RGB rgb, int alpha) {
	super();
	if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	init(rgb.red, rgb.green, rgb.blue, alpha);
	}

	@Override
	void destroy() {
	handle = null;
	}

	/**
	* Colors do not need to be disposed, however to maintain compatibility
	* with older code, disposing a Color is not an error.
	*/
	@Override
	public void dispose() {
	// Does as below to maintain API contract with Resource. Does
	// not use super.dispose() because that untracks the Color
	// from the Device tracking, however init() is overridden
	// to prevent the tracking in the first place.
	destroy();
	device = null;
	}

	/**
	* Returns the <code>Device</code> where this resource was
	* created. In cases where no <code>Device</code> was used
	* at creation, returns the current or default Device.
	*
	* @return <code>Device</code> the device of the receiver
	* @since 3.2
	*/
	@Override
	public Device getDevice() {
	// Fall back on Device.getDevice only if we haven't been disposed
	// already.
	if (this.device == null && this.handle != null) return Device.getDevice();
	return super.getDevice();
	}

	/**
	* Compares the argument to the receiver, and returns true
	* if they represent the <em>same</em> object using a class
	* specific comparison.
	*
	* @param object the object to compare with this object
	* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
	*
	* @see #hashCode
	*/
	@Override
	public boolean equals(Object object) {
	if (object == this) return true;
	if (!(object instanceof Color)) return false;
	Color color = (Color)object;
	double [] rgbColor = color.handle;
	if (handle == rgbColor) return true;
	return
	(int)(handle[0] * 255) == (int)(rgbColor[0] * 255) &&
	(int)(handle[1] * 255) == (int)(rgbColor[1] * 255) &&
	(int)(handle[2] * 255) == (int)(rgbColor[2] * 255) &&
	(int)(handle[3] * 255) == (int)(rgbColor[3] * 255);

	}

	/**
	* Returns the amount of alpha in the color, from 0 (transparent) to 255 (opaque).
	*
	* @return the alpha component of the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	* @since 3.104
	*/
	public int getAlpha() {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return (int)(handle[3] * 255);
	}

	/**
	* Returns the amount of blue in the color, from 0 to 255.
	*
	* @return the blue component of the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	*/
	public int getBlue() {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return (int)(handle[2] * 255);
	}

	/**
	* Returns the amount of green in the color, from 0 to 255.
	*
	* @return the green component of the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	*/
	public int getGreen() {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return (int)(handle[1] * 255);
	}

	/**
	* Returns the amount of red in the color, from 0 to 255.
	*
	* @return the red component of the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	*/
	public int getRed() {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return (int)(handle[0] * 255);
	}

	/**
	* Returns an integer hash code for the receiver. Any two
	* objects that return <code>true</code> when passed to
	* <code>equals</code> must return the same value for this
	* method.
	*
	* @return the receiver's hash
	*
	* @see #equals
	*/
	@Override
	public int hashCode() {
	if (isDisposed()) return 0;
	return (int)(handle[0] * 255) ^ (int)(handle[1] * 255) ^ (int)(handle[2] * 255) ^ (int)(handle[3] * 255);
	}

	/**
	* Returns an <code>RGB</code> representing the receiver.
	*
	* @return the RGB for the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	*/
	public RGB getRGB () {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return new RGB(getRed(), getGreen(), getBlue());
	}

	/**
	* Returns an <code>RGBA</code> representing the receiver.
	*
	* @return the RGBA for the color
	*
	* @exception SWTException <ul>
	* <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
	* </ul>
	* @since 3.104
	*/
	public RGBA getRGBA () {
	if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return new RGBA(getRed(), getGreen(), getBlue(), getAlpha());
	}

	/**
	* Invokes platform specific functionality to allocate a new color.
	* <p>
	* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
	* API for <code>Color</code>. 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>
	*
	* @param device the device on which to allocate the color
	* @param handle the handle for the color
	*
	* @noreference This method is not intended to be referenced by clients.
	*/
	public static Color cocoa_new(Device device, double [] handle) {
	double [] rgbColor = handle;
	Color color = new Color(device);
	color.handle = rgbColor;
	return color;
	}

	/**
	* Invokes platform specific functionality to allocate a new color.
	* <p>
	* <b>IMPORTANT:</b> This method is <em>not</em> part of the public
	* API for <code>Color</code>. 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>
	*
	* @param device the device on which to allocate the color
	* @param handle the handle for the color
	* @param alpha the int for the alpha content in the color(Currently SWT honors extreme values for alpha ie. 0 or 255)
	*
	* @noreference This method is not intended to be referenced by clients.
	*/
	public static Color cocoa_new(Device device, double [] handle, int alpha) {
	double [] rgbColor = handle;
	Color color = new Color(device);
	color.handle = rgbColor;
	color.handle[3] = alpha / 255f;
	return color;
	}

	/**
	* Allocates the operating system resources associated
	* with the receiver.
	*
	* @param device the device on which to allocate the color
	* @param red the amount of red in the color
	* @param green the amount of green in the color
	* @param blue the amount of blue in the color
	* @param alpha the amount of alpha in the color
	*
	* @exception IllegalArgumentException <ul>
	* <li>ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255</li>
	* </ul>
	*/
	void init(int red, int green, int blue, int alpha) {
	if ((red > 255) \|\| (red < 0) \|\|
	(green > 255) \|\| (green < 0) \|\|
	(blue > 255) \|\| (blue < 0) \|\|
	(alpha > 255) \|\| (alpha < 0)) {
	SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	double [] rgbColor = new double [4];
	rgbColor[0] = red / 255f;
	rgbColor[1] = green / 255f;
	rgbColor[2] = blue / 255f;
	rgbColor[3] = alpha / 255f;
	handle = rgbColor;
	}

	@Override
	void init() {
	// Resource init simply tracks this resource in the Device
	// if DEBUG is on. Since Colors don't require disposal,
	// the tracking would be a memory leak and a misreport
	// on what resources are in use.
	}

	/**
	* Returns <code>true</code> if the color has been disposed,
	* and <code>false</code> otherwise.
	* <p>
	* This method gets the dispose state for the color.
	* When a color has been disposed, it is an error to
	* invoke any other method (except {@link #dispose()}) using the color.
	*
	* @return <code>true</code> when the color is disposed and <code>false</code> otherwise
	*/
	@Override
	public boolean isDisposed() {
	return handle == null;
	}

	/**
	* Returns a string containing a concise, human-readable
	* description of the receiver.
	*
	* @return a string representation of the receiver
	*/
	@Override
	public String toString () {
	if (isDisposed()) return "Color {DISPOSED}";
	return "Color {" + getRed() + ", " + getGreen() + ", " + getBlue() + ", " + getAlpha() + "}";
	}

	}