[LayoutNG] Introduce NGPhysicalFragment and make NGFragment a 'view'

third_party/WebKit/Source/core/layout/ng/ng_units.cc

+// 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.
+
+#include "core/layout/ng/ng_units.h"
+
+#include "core/layout/ng/ng_writing_mode.h"
+
+namespace blink {
+
+NGPhysicalSize NGLogicalSize::ConvertToPhysical(NGWritingMode mode) const {
+  return mode == HorizontalTopBottom ? NGPhysicalSize(inline_size, block_size)
+                                     : NGPhysicalSize(block_size, inline_size);
+}
+
+NGLogicalSize NGPhysicalSize::ConvertToLogical(NGWritingMode mode) const {
+  return mode == HorizontalTopBottom ? NGLogicalSize(width, height)
+                                     : NGLogicalSize(height, width);
+}
+
+NGPhysicalOffset NGLogicalOffset::ConvertToPhysical(
+    NGWritingMode mode,
+    NGDirection direction,
+    NGPhysicalSize container_size,
+    NGPhysicalSize inner_size) const {
+  switch (mode) {
+    case HorizontalTopBottom:
+      if (direction == LeftToRight)
+        return NGPhysicalOffset(inline_offset, block_offset);
+      else
+        return NGPhysicalOffset(
+            container_size.width - inline_offset - inner_size.width,
+            block_offset);
+    case VerticalRightLeft:
+    case SidewaysRightLeft:
+      if (direction == LeftToRight)
+        return NGPhysicalOffset(
+            container_size.width - block_offset - inner_size.width,
+            inline_offset);
+      else
+        return NGPhysicalOffset(
+            container_size.width - block_offset - inner_size.width,
+            container_size.height - inline_offset - inner_size.height);
+    case VerticalLeftRight:
+      if (direction == LeftToRight)
+        return NGPhysicalOffset(block_offset, inline_offset);
+      else
+        return NGPhysicalOffset(
+            block_offset,
+            container_size.height - inline_offset - inner_size.height);
+    case SidewaysLeftRight:
+      if (direction == LeftToRight)
+        return NGPhysicalOffset(
+            block_offset,
+            container_size.height - inline_offset - inner_size.height);
+      else
+        return NGPhysicalOffset(block_offset, inline_offset);
+    default:
+      ASSERT_NOT_REACHED();
+      return NGPhysicalOffset();
+  }
+}
+
+}  // namespace blink