1 /* 2 * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org) 3 * Copyright (C) 2003, 2004, 2006, 2007, 2008 Apple Inc. All right reserved. 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public License 16 * along with this library; see the file COPYING.LIB. If not, write to 17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 18 * Boston, MA 02110-1301, USA. 19 * 20 */ 21 22 #ifndef BidiCharacterRun_h 23 #define BidiCharacterRun_h 24 25 #include "platform/text/BidiContext.h" 26 #include "platform/text/TextDirection.h" 27 28 namespace blink { 29 30 struct BidiCharacterRun { 31 BidiCharacterRun(int start, int stop, BidiContext* context, WTF::Unicode::Direction dir) 32 : m_override(context->override()) 33 , m_next(0) 34 , m_start(start) 35 , m_stop(stop) 36 { 37 ASSERT(m_start <= m_stop); 38 if (dir == WTF::Unicode::OtherNeutral) 39 dir = context->dir(); 40 41 m_level = context->level(); 42 43 // add level of run (cases I1 & I2) 44 if (m_level % 2) { 45 if (dir == WTF::Unicode::LeftToRight || dir == WTF::Unicode::ArabicNumber || dir == WTF::Unicode::EuropeanNumber) 46 m_level++; 47 } else { 48 if (dir == WTF::Unicode::RightToLeft) 49 m_level++; 50 else if (dir == WTF::Unicode::ArabicNumber || dir == WTF::Unicode::EuropeanNumber) 51 m_level += 2; 52 } 53 } 54 55 // BidiCharacterRun are allocated out of the rendering partition. 56 PLATFORM_EXPORT void* operator new(size_t); 57 PLATFORM_EXPORT void operator delete(void*); 58 59 int start() const { return m_start; } 60 int stop() const { return m_stop; } 61 unsigned char level() const { return m_level; } 62 bool reversed(bool visuallyOrdered) const { return m_level % 2 && !visuallyOrdered; } 63 bool dirOverride(bool visuallyOrdered) { return m_override || visuallyOrdered; } 64 TextDirection direction() const { return reversed(false) ? RTL : LTR; } 65 66 BidiCharacterRun* next() const { return m_next; } 67 void setNext(BidiCharacterRun* next) { m_next = next; } 68 69 // Do not add anything apart from bitfields until after m_next. See https://bugs.webkit.org/show_bug.cgi?id=100173 70 bool m_override : 1; 71 bool m_hasHyphen : 1; // Used by BidiRun subclass which is a layering violation but enables us to save 8 bytes per object on 64-bit. 72 unsigned char m_level; 73 BidiCharacterRun* m_next; 74 int m_start; 75 int m_stop; 76 }; 77 78 } // namespace blink 79 80 #endif // BidiCharacterRun_h 81
