1/*
2 * Copyright (C) 2010 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef VerticalPositionCache_h
27#define VerticalPositionCache_h
28
29#include "platform/fonts/FontBaseline.h"
30#include "wtf/HashMap.h"
31
32namespace blink {
33
34class RenderObject;
35
36// Values for vertical alignment.
37const int PositionUndefined = 0x80000000;
38
39class VerticalPositionCache {
40    WTF_MAKE_NONCOPYABLE(VerticalPositionCache);
41public:
42    VerticalPositionCache()
43    { }
44
45    int get(RenderObject* renderer, FontBaseline baselineType) const
46    {
47        const HashMap<RenderObject*, int>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions;
48        const HashMap<RenderObject*, int>::const_iterator it = mapToCheck.find(renderer);
49        if (it == mapToCheck.end())
50            return PositionUndefined;
51        return it->value;
52    }
53
54    void set(RenderObject* renderer, FontBaseline baselineType, int position)
55    {
56        if (baselineType == AlphabeticBaseline)
57            m_alphabeticPositions.set(renderer, position);
58        else
59            m_ideographicPositions.set(renderer, position);
60    }
61
62private:
63    HashMap<RenderObject*, int> m_alphabeticPositions;
64    HashMap<RenderObject*, int> m_ideographicPositions;
65};
66
67} // namespace blink
68
69#endif // VerticalPositionCache_h
70