[LayoutNG] Initial support for the 'vertical-align' property

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_box_state.h

+// Copyright 2017 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 NGInlineBoxState_h
+#define NGInlineBoxState_h
+
+#include "core/CoreExport.h"
+#include "core/layout/ng/inline/ng_line_height_metrics.h"
+#include "core/style/ComputedStyleConstants.h"
+#include "platform/LayoutUnit.h"
+#include "platform/fonts/FontBaseline.h"
+#include "platform/wtf/Vector.h"
+
+namespace blink {
+
+class NGLayoutInlineItem;
+
+// Fragments that require the layout position/size of ancestor are packed in
+// this struct.
+struct NGPendingPositions {
+  unsigned fragment_start;
+  unsigned fragment_end;
+  NGLineHeightMetrics metrics;
+  EVerticalAlign vertical_align;
+};
+
+// Represents the current box while NGInlineLayoutAlgorithm performs layout.
+// Used 1) to cache common values for a box, and 2) to layout children that
+// require ancestor position or size.
+struct NGInlineBoxState {
+  unsigned fragment_start;
+  const ComputedStyle* style;
+  NGLineHeightMetrics metrics;
+  NGLineHeightMetrics text_metrics;
+  LayoutUnit text_top;
+  Vector<NGPendingPositions> pending_descendants;
+  bool include_used_fonts = false;
+
+  void ComputeTextMetrics(const NGLayoutInlineItem&, FontBaseline);
+};
+using NGInlineLayoutStateStack = Vector<NGInlineBoxState, 4>;
+
+}  // namespace blink
+
+#endif  // NGInlineBoxState_h