| /* |
| * Copyright (C) 2000 Lars Knoll (knoll@kde.org) |
| * Copyright (C) 2003, 2004, 2006, 2007, 2008 Apple 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. |
| * |
| */ |
| |
| #ifndef BidiCharacterRun_h |
| #define BidiCharacterRun_h |
| |
| #include "platform/text/BidiContext.h" |
| #include "platform/text/TextDirection.h" |
| |
| namespace blink { |
| |
| struct BidiCharacterRun { |
| BidiCharacterRun(bool override, |
| unsigned char level, |
| int start, |
| int stop, |
| WTF::Unicode::CharDirection dir, |
| WTF::Unicode::CharDirection overrideDir) |
| : m_override(override), |
| m_level(level), |
| m_next(0), |
| m_start(start), |
| m_stop(stop) { |
| ASSERT(m_start <= m_stop); |
| if (dir == WTF::Unicode::OtherNeutral) |
| dir = overrideDir; |
| |
| m_level = level; |
| |
| // add level of run (cases I1 & I2) |
| if (m_level % 2) { |
| if (dir == WTF::Unicode::LeftToRight || |
| dir == WTF::Unicode::ArabicNumber || |
| dir == WTF::Unicode::EuropeanNumber) |
| m_level++; |
| } else { |
| if (dir == WTF::Unicode::RightToLeft) |
| m_level++; |
| else if (dir == WTF::Unicode::ArabicNumber || |
| dir == WTF::Unicode::EuropeanNumber) |
| m_level += 2; |
| } |
| } |
| |
| // BidiCharacterRun are allocated out of the rendering partition. |
| PLATFORM_EXPORT void* operator new(size_t); |
| PLATFORM_EXPORT void operator delete(void*); |
| |
| int start() const { return m_start; } |
| int stop() const { return m_stop; } |
| unsigned char level() const { return m_level; } |
| bool reversed(bool visuallyOrdered) const { |
| return m_level % 2 && !visuallyOrdered; |
| } |
| bool dirOverride(bool visuallyOrdered) { |
| return m_override || visuallyOrdered; |
| } |
| TextDirection direction() const { |
| return reversed(false) ? TextDirection::Rtl : TextDirection::Ltr; |
| } |
| |
| BidiCharacterRun* next() const { return m_next; } |
| void setNext(BidiCharacterRun* next) { m_next = next; } |
| |
| // Do not add anything apart from bitfields until after m_next. See |
| // https://bugs.webkit.org/show_bug.cgi?id=100173 |
| bool m_override : 1; |
| // Used by BidiRun subclass which is a layering violation but enables us to |
| // save 8 bytes per object on 64-bit. |
| bool m_hasHyphen : 1; |
| unsigned char m_level; |
| BidiCharacterRun* m_next; |
| int m_start; |
| int m_stop; |
| }; |
| |
| } // namespace blink |
| |
| #endif // BidiCharacterRun_h |