// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.ui.editors;

import java.util.HashMap;

import java.util.Map;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.graphics.RGB;

import org.eclipse.swt.widgets.Display;

/**

 * Converts RGB to Color, reuses the existing Color instances.

 * A singleton.

 */

public class EditorColors {

  private static final Map<Integer, Color> intToColor = new HashMap<Integer, Color>();

  public static Color getColor(RGB rgb) {

    Integer colorInt = rgbToInteger(rgb);

    Color color = intToColor.get(colorInt);

    if (color == null) {

      color = new Color(Display.getDefault(), rgb);

      intToColor.put(colorInt, color);

    }

    return color;

  }

  private static Integer rgbToInteger(RGB rgb) {

    return

        ((rgb.red & 0xFF) << 16) +

        ((rgb.green & 0xFF) << 8) +

        (rgb.blue & 0xFF);

  }

}