// 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);
  }
}