Implement collection of out-of-flow descendants

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 {
 
@@ skipping 208 matching lines @@
 }
 
 bool NGMarginStrut::operator==(const NGMarginStrut& other) const {
   return std::tie(other.margin_block_start, other.margin_block_end,
                   other.negative_margin_block_start,
                   other.negative_margin_block_end) ==
          std::tie(margin_block_start, margin_block_end,
                   negative_margin_block_start, negative_margin_block_end);
 }
 
+NGCorner NGCorner::Create(NGWritingMode writing_mode,
+                          TextDirection direction,
+                          NGPhysicalOffset offset) {
+  NGCorner c;
+  c.offset = offset;
+  switch (writing_mode) {
+    case kHorizontalTopBottom:
+      c.type = (direction == LTR) ? kTopLeft : kTopRight;
+      break;
+    case kVerticalRightLeft:
+    case kSidewaysRightLeft:
+      c.type = (direction == LTR) ? kTopRight : kBottomRight;
+      break;
+    case kVerticalLeftRight:
+      c.type = (direction == LTR) ? kTopLeft : kBottomLeft;
+      break;
+    case kSidewaysLeftRight:
+      c.type = (direction == LTR) ? kBottomLeft : kTopLeft;
+      break;
+  }
+  return c;
+}
+
 }  // namespace blink