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Diffstat (limited to 'WebCore/rendering/VerticalPositionCache.h')
-rw-r--r-- | WebCore/rendering/VerticalPositionCache.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/WebCore/rendering/VerticalPositionCache.h b/WebCore/rendering/VerticalPositionCache.h new file mode 100644 index 0000000..4deaef5 --- /dev/null +++ b/WebCore/rendering/VerticalPositionCache.h @@ -0,0 +1,70 @@ +/* + * Copyright (C) 2010 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef VerticalPositionCache_h +#define VerticalPositionCache_h + +#include "FontBaseline.h" +#include <wtf/HashMap.h> + +namespace WebCore { + +class RenderObject; + +// Values for vertical alignment. +const int PositionTop = -0x7fffffff; +const int PositionBottom = 0x7fffffff; +const int PositionUndefined = 0x80000000; + +class VerticalPositionCache : public Noncopyable { +public: + VerticalPositionCache() + { } + + int get(RenderObject* renderer, FontBaseline baselineType) const + { + const HashMap<RenderObject*, int>& mapToCheck = baselineType == AlphabeticBaseline ? m_alphabeticPositions : m_ideographicPositions; + const HashMap<RenderObject*, int>::const_iterator it = mapToCheck.find(renderer); + if (it == mapToCheck.end()) + return PositionUndefined; + return it->second; + } + + void set(RenderObject* renderer, FontBaseline baselineType, int position) + { + if (baselineType == AlphabeticBaseline) + m_alphabeticPositions.set(renderer, position); + else + m_ideographicPositions.set(renderer, position); + } + +private: + HashMap<RenderObject*, int> m_alphabeticPositions; + HashMap<RenderObject*, int> m_ideographicPositions; +}; + +} // namespace WebCore + +#endif // VerticalPositionCache_h |