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 116 matching lines @@
 
 bool NGLogicalOffset::operator<=(const NGLogicalOffset& other) const {
   return inline_offset <= other.inline_offset &&
          block_offset <= other.block_offset;
 }
 
 String NGLogicalOffset::ToString() const {
   return String::format("%dx%d", inline_offset.toInt(), block_offset.toInt());
 }
 
+NGPhysicalOffset NGPhysicalOffset::operator+(
+    const NGPhysicalOffset& other) const {
+  return NGPhysicalOffset{this->left + other.left, this->top + other.top};
+}
+
+NGPhysicalOffset& NGPhysicalOffset::operator+=(const NGPhysicalOffset& other) {
+  *this = *this + other;
+  return *this;
+}
+
 bool NGBoxStrut::IsEmpty() const {
   return *this == NGBoxStrut();
 }
 
 bool NGBoxStrut::operator==(const NGBoxStrut& other) const {
   return std::tie(other.inline_start, other.inline_end, other.block_start,
                   other.block_end) ==
          std::tie(inline_start, inline_end, block_start, block_end);
 }
 
@@ skipping 72 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);
 }
 
+NGStaticPosition NGStaticPosition::Create(NGWritingMode writing_mode,
+                                          TextDirection direction,
+                                          NGPhysicalOffset offset) {
+  NGStaticPosition position;
+  position.offset = offset;
+  switch (writing_mode) {
+    case kHorizontalTopBottom:
+      position.type = (direction == LTR) ? kTopLeft : kTopRight;
+      break;
+    case kVerticalRightLeft:
+    case kSidewaysRightLeft:
+      position.type = (direction == LTR) ? kTopRight : kBottomRight;
+      break;
+    case kVerticalLeftRight:
+      position.type = (direction == LTR) ? kTopLeft : kBottomLeft;
+      break;
+    case kSidewaysLeftRight:
+      position.type = (direction == LTR) ? kBottomLeft : kTopLeft;
+      break;
+  }
+  return position;
+}
+
 }  // namespace blink