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#pragma once
27
28#include "FontBaseline.h"
29#include <wtf/HashMap.h>
30
31namespace WebCore {
32
33class RenderObject;
34
35class VerticalPositionCache {
36 WTF_MAKE_NONCOPYABLE(VerticalPositionCache);
37public:
38 VerticalPositionCache()
39 { }
40
41 bool get(RenderObject* renderer, FontBaseline baselineType, LayoutUnit& result) const
42 {
43 const HashMap<RenderObject*, LayoutUnit>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions;
44 const HashMap<RenderObject*, LayoutUnit>::const_iterator it = mapToCheck.find(renderer);
45 if (it == mapToCheck.end())
46 return false;
47
48 result = it->value;
49 return true;
50 }
51
52 void set(RenderObject* renderer, FontBaseline baselineType, LayoutUnit position)
53 {
54 if (baselineType == AlphabeticBaseline)
55 m_alphabeticPositions.set(renderer, position);
56 else
57 m_ideographicPositions.set(renderer, position);
58 }
59
60private:
61 HashMap<RenderObject*, LayoutUnit> m_alphabeticPositions;
62 HashMap<RenderObject*, LayoutUnit> m_ideographicPositions;
63};
64
65} // namespace WebCore
66