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/*
* 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 "base/macros.h"
#include "core/layout/api/LineLayoutItem.h"
#include "platform/fonts/FontBaseline.h"
#include "platform/wtf/Allocator.h"
#include "platform/wtf/HashMap.h"
namespace blink {
// Values for vertical alignment.
const int kPositionUndefined = 0x80000000;
class VerticalPositionCache {
STACK_ALLOCATED();
public:
VerticalPositionCache() = default;
int Get(LineLayoutItem layout_object, FontBaseline baseline_type) const {
const HashMap<LineLayoutItem, int>& map_to_check =
baseline_type == kAlphabeticBaseline ? alphabetic_positions_
: ideographic_positions_;
const HashMap<LineLayoutItem, int>::const_iterator it =
map_to_check.find(layout_object);
if (it == map_to_check.end())
return kPositionUndefined;
return it->value;
}
void Set(LineLayoutItem layout_object,
FontBaseline baseline_type,
int position) {
if (baseline_type == kAlphabeticBaseline)
alphabetic_positions_.Set(layout_object, position);
else
ideographic_positions_.Set(layout_object, position);
}
private:
HashMap<LineLayoutItem, int> alphabetic_positions_;
HashMap<LineLayoutItem, int> ideographic_positions_;
DISALLOW_COPY_AND_ASSIGN(VerticalPositionCache);
};
} // namespace blink
#endif // VerticalPositionCache_h