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90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/*
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* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2003, 2004, 2006, 2007, 2008 Apple Inc. All right reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
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#define SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
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#include "flutter/sky/engine/platform/text/BidiContext.h"
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#include "flutter/sky/engine/platform/text/TextDirection.h"
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namespace blink {
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struct BidiCharacterRun {
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BidiCharacterRun(int start,
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int stop,
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BidiContext* context,
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WTF::Unicode::Direction dir)
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: m_override(context->override()),
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m_next(0),
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m_start(start),
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m_stop(stop) {
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ASSERT(m_start <= m_stop);
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if (dir == WTF::Unicode::OtherNeutral)
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dir = context->dir();
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m_level = context->level();
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// add level of run (cases I1 & I2)
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if (m_level % 2) {
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if (dir == WTF::Unicode::LeftToRight ||
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dir == WTF::Unicode::ArabicNumber ||
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dir == WTF::Unicode::EuropeanNumber)
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m_level++;
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} else {
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if (dir == WTF::Unicode::RightToLeft)
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m_level++;
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else if (dir == WTF::Unicode::ArabicNumber ||
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dir == WTF::Unicode::EuropeanNumber)
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m_level += 2;
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}
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}
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// BidiCharacterRun are allocated out of the rendering partition.
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PLATFORM_EXPORT void* operator new(size_t);
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PLATFORM_EXPORT void operator delete(void*);
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int start() const { return m_start; }
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int stop() const { return m_stop; }
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unsigned char level() const { return m_level; }
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bool reversed() const { return m_level % 2; }
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bool dirOverride() { return m_override; }
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TextDirection direction() const { return reversed() ? RTL : LTR; }
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BidiCharacterRun* next() const { return m_next; }
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void setNext(BidiCharacterRun* next) { m_next = next; }
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// Do not add anything apart from bitfields until after m_next. See
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// https://bugs.webkit.org/show_bug.cgi?id=100173
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bool m_override : 1;
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bool m_hasHyphen : 1; // Used by BidiRun subclass which is a layering
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// violation but enables us to save 8 bytes per object
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// on 64-bit.
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bool m_hasAddedEllipsis : 1;
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unsigned char m_level;
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BidiCharacterRun* m_next;
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int m_start;
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int m_stop;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PLATFORM_TEXT_BIDICHARACTERRUN_H_
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