[LayoutNG] Add writing-mode and direction to NGFragmentBase

third_party/WebKit/Source/core/layout/ng/ng_fragment_base.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGFragmentBase_h
 #define NGFragmentBase_h
 
 #include "core/CoreExport.h"
 #include "platform/LayoutUnit.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CORE_EXPORT NGFragmentBase : public GarbageCollected<NGFragmentBase> {
  public:
+  enum NGFragmentType { FragmentBox = 0, FragmentText = 1 };
+
+  // TODO(eae): We might want to re-use WritingMode and Direction from style.
+  enum NGWritingMode {
+    HorizontalTopBottom = 0,
+    VerticalRightLeft = 1,
+    VerticalLeftRight = 2,
+    SidewaysRightLeft = 3,
+    SidewaysLeftRight = 4
+  };
+  enum NGDirection { LeftToRight = 0, RightToLeft = 1 };
+
+  NGFragmentType type() const { return static_cast<NGFragmentType>(m_type); }
+  NGWritingMode writingMode() const {
+    return static_cast<NGWritingMode>(m_writingMode);
+  }
+  NGDirection direction() const {
+    return static_cast<NGDirection>(m_direction);
+  }
+
   // Returns the border-box size.
   LayoutUnit inlineSize() const { return m_inlineSize; }
   LayoutUnit blockSize() const { return m_blockSize; }
 
   // Returns the total size, including the contents outside of the border-box.
   LayoutUnit inlineOverflow() const { return m_inlineOverflow; }
   LayoutUnit blockOverflow() const { return m_blockOverflow; }
 
   // Returns the offset relative to the parent fragement's content-box.
   LayoutUnit inlineOffset() const { return m_inlineOffset; }
   LayoutUnit blockOffset() const { return m_blockOffset; }
 
   // Should only be used by the parent fragement's layout.
   void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
 
   DEFINE_INLINE_TRACE_AFTER_DISPATCH() {}
   DECLARE_TRACE();
 
  protected:
   NGFragmentBase(LayoutUnit inlineSize,
                  LayoutUnit blockSize,
                  LayoutUnit inlineOverflow,
-                 LayoutUnit blockOverflow);
+                 LayoutUnit blockOverflow,
+                 NGWritingMode,
+                 NGDirection,
+                 NGFragmentType);
 
   LayoutUnit m_inlineSize;
   LayoutUnit m_blockSize;
   LayoutUnit m_inlineOverflow;
   LayoutUnit m_blockOverflow;
   LayoutUnit m_inlineOffset;
   LayoutUnit m_blockOffset;
-  bool m_isText;
+
+  unsigned m_type : 1;
+  unsigned m_writingMode : 3;
+  unsigned m_direction : 1;
+  unsigned m_hasBeenPlaced : 1;
 };
 
 }  // namespace blink
 
 #endif  // NGFragmentBase_h