1/*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef StyleColor_h
32#define StyleColor_h
33
34#include "platform/graphics/Color.h"
35
36namespace blink {
37
38class StyleColor {
39public:
40    StyleColor(Color color) : m_color(color), m_currentColor(false) { }
41    static StyleColor currentColor() { return StyleColor(); }
42
43    bool isCurrentColor() const { return m_currentColor; }
44    Color color() const { ASSERT(!isCurrentColor()); return m_color; }
45
46    Color resolve(Color currentColor) const { return m_currentColor ? currentColor : m_color; }
47
48private:
49    StyleColor() : m_currentColor(true) { }
50    Color m_color;
51    bool m_currentColor;
52};
53
54inline bool operator==(const StyleColor& a, const StyleColor& b)
55{
56    if (a.isCurrentColor() || b.isCurrentColor())
57        return a.isCurrentColor() && b.isCurrentColor();
58    return a.color() == b.color();
59}
60
61inline bool operator!=(const StyleColor& a, const StyleColor& b)
62{
63    return !(a == b);
64}
65
66
67} // namespace blink
68
69#endif // StyleColor_h
70