| /* |
| * 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_BIDI_CHARACTER_RUN_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_BIDI_CHARACTER_RUN_H_ |
| |
| #include "third_party/blink/renderer/platform/text/bidi_context.h" |
| #include "third_party/blink/renderer/platform/text/text_direction.h" |
| |
| namespace blink { |
| |
| struct BidiCharacterRun { |
| USING_FAST_MALLOC(BidiCharacterRun); |
| |
| public: |
| BidiCharacterRun(bool override, |
| unsigned char level, |
| int start, |
| int stop, |
| WTF::unicode::CharDirection dir, |
| WTF::unicode::CharDirection override_dir) |
| : override_(override), |
| level_(level), |
| next_(nullptr), |
| start_(start), |
| stop_(stop) { |
| DCHECK_LE(start_, stop_); |
| if (dir == WTF::unicode::kOtherNeutral) |
| dir = override_dir; |
| |
| level_ = level; |
| |
| // add level of run (cases I1 & I2) |
| if (level_ % 2) { |
| if (dir == WTF::unicode::kLeftToRight || |
| dir == WTF::unicode::kArabicNumber || |
| dir == WTF::unicode::kEuropeanNumber) |
| level_++; |
| } else { |
| if (dir == WTF::unicode::kRightToLeft) |
| level_++; |
| else if (dir == WTF::unicode::kArabicNumber || |
| dir == WTF::unicode::kEuropeanNumber) |
| level_ += 2; |
| } |
| } |
| |
| BidiCharacterRun(int start, int stop, unsigned char level) |
| : override_(false), |
| level_(level), |
| next_(nullptr), |
| start_(start), |
| stop_(stop) {} |
| |
| int Start() const { return start_; } |
| int Stop() const { return stop_; } |
| unsigned char Level() const { return level_; } |
| bool Reversed(bool visually_ordered) const { |
| return level_ % 2 && !visually_ordered; |
| } |
| bool DirOverride(bool visually_ordered) { |
| return override_ || visually_ordered; |
| } |
| TextDirection Direction() const { |
| return Reversed(false) ? TextDirection::kRtl : TextDirection::kLtr; |
| } |
| |
| BidiCharacterRun* Next() const { return next_; } |
| void SetNext(BidiCharacterRun* next) { next_ = next; } |
| |
| // Do not add anything apart from bitfields until after m_next. See |
| // https://bugs.webkit.org/show_bug.cgi?id=100173 |
| bool override_ : 1; |
| // Used by BidiRun subclass which is a layering violation but enables us to |
| // save 8 bytes per object on 64-bit. |
| bool has_hyphen_ : 1; |
| unsigned char level_; |
| BidiCharacterRun* next_; |
| int start_; |
| int stop_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_BIDI_CHARACTER_RUN_H_ |