third_party/WebKit/Source/platform/fonts/FontOrientation.h

/*
 * Copyright (C) 2010 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 */

#ifndef FontOrientation_h
#define FontOrientation_h

#include "platform/text/Character.h"

namespace blink {

enum class FontOrientation {
  // Horizontal; i.e., writing-mode: horizontal-tb
  Horizontal = 0,
  // Baseline is vertical but use rotated horizontal typography;
  // i.e., writing-mode: vertical-*; text-orientation: sideways-*
  VerticalRotated = 1,
  // Vertical with upright CJK and rotated non-CJK;
  // i.e., writing-mode: vertical-*, text-orientation: mixed
  VerticalMixed = 2,
  // Vertical with all upright;
  // i.e., writing-mode: vertical-*, text-orientation: upright
  VerticalUpright = 3,

  BitCount = 2,

  AnyUprightMask = 2,
};

inline bool operator&(FontOrientation value, FontOrientation mask) {
  return static_cast<unsigned>(value) & static_cast<unsigned>(mask);
}
inline bool isVerticalAnyUpright(FontOrientation orientation) {
  return orientation & FontOrientation::AnyUprightMask;
}
inline bool isVerticalNonCJKUpright(FontOrientation orientation) {
  return orientation == FontOrientation::VerticalUpright;
}
inline bool isVerticalUpright(FontOrientation orientation, UChar32 character) {
  return orientation == FontOrientation::VerticalUpright ||
         (orientation == FontOrientation::VerticalMixed &&
          Character::isUprightInMixedVertical(character));
}
inline bool isVerticalBaseline(FontOrientation orientation) {
  return orientation != FontOrientation::Horizontal;
}

inline FontOrientation adjustOrientationForCharacterInMixedVertical(
    FontOrientation orientation,
    UChar32 character) {
  if (orientation != FontOrientation::VerticalMixed)
    return orientation;
  return Character::isUprightInMixedVertical(character)
             ? FontOrientation::VerticalUpright
             : FontOrientation::VerticalRotated;
}

}  // namespace blink

#endif  // FontOrientation_h