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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003-2021 Apple Inc. All right reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 ChangSeok Oh <shivamidow@gmail.com>
* Copyright (C) 2013 Adobe Systems Inc. All right reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "FontCascade.h"
#include "RenderBlock.h"
#include "RenderStyle.h"
#include <optional>
#include <wtf/HashSet.h>
namespace WebCore {
struct WordTrailingSpace {
WordTrailingSpace(const RenderStyle& style, bool measuringWithTrailingWhitespaceEnabled = true)
: m_style(style)
{
if (!measuringWithTrailingWhitespaceEnabled || !m_style.fontCascade().enableKerning())
m_state = WordTrailingSpaceState::Initialized;
}
std::optional<float> width(SingleThreadWeakHashSet<const Font>& fallbackFonts)
{
if (m_state == WordTrailingSpaceState::Initialized)
return m_width;
auto& font = m_style.fontCascade();
m_width = font.width(RenderBlock::constructTextRun(span(space), m_style), &fallbackFonts) + font.wordSpacing();
m_state = WordTrailingSpaceState::Initialized;
return m_width;
}
private:
enum class WordTrailingSpaceState { Uninitialized, Initialized };
const RenderStyle& m_style;
WordTrailingSpaceState m_state { WordTrailingSpaceState::Uninitialized };
std::optional<float> m_width;
};
} // namespace WebCore
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