Reland of Use NGLogicalRect instead of NGExclusion for exclusions.

third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.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_layout_opportunity_iterator.h"
 
 #include "core/layout/ng/ng_physical_constraint_space.h"
 #include "core/layout/ng/ng_units.h"
 #include "wtf/NonCopyingSort.h"
 
@@ skipping 25 matching lines @@
   opportunity.size.inline_size -= origin_point.inline_offset;
   opportunity.size.block_size -= origin_point.block_offset;
   return opportunity;
 }
 
 // Whether 2 edges overlap with each other.
 bool IsOverlapping(const NGEdge& edge1, const NGEdge& edge2) {
   return std::max(edge1.start, edge2.start) <= std::min(edge1.end, edge2.end);
 }
 
-// Whether the exclusion is out of bounds of the LayoutNG constraint space.
-bool IsExclusionWithinSpace(const NGLayoutOpportunity& opportunity,
-                            const NGExclusion& exclusion) {
-  LayoutUnit left = opportunity.offset.inline_offset;
-  LayoutUnit top = opportunity.offset.block_offset;
-  LayoutUnit right = left + opportunity.size.inline_size;
-  LayoutUnit bottom = top + opportunity.size.block_size;
-
-  return !(exclusion.Right() <= left || exclusion.Bottom() <= top ||
-           exclusion.Left() >= right || exclusion.Top() >= bottom);
-}
-
 // Creates the *BOTTOM* positioned Layout Opportunity tree node by splitting
 // the parent node with the exclusion.
 //
 // @param parent_node Node that needs to be split.
 // @param exclusion Exclusion existed in the parent node constraint space.
 // @return New node or nullptr if the new block size == 0.
 NGLayoutOpportunityTreeNode* CreateBottomNGLayoutOpportunityTreeNode(
     const NGLayoutOpportunityTreeNode* parent_node,
-    const NGExclusion& exclusion) {
+    const NGLogicalRect& exclusion) {
   const NGLayoutOpportunity& parent_opportunity = parent_node->opportunity;
-  LayoutUnit left = parent_opportunity.offset.inline_offset;
-  LayoutUnit top = exclusion.Bottom();
-  LayoutUnit right = left + parent_opportunity.size.inline_size;
-  LayoutUnit bottom = parent_opportunity.offset.block_offset +
-                      parent_opportunity.size.block_size;
-
-  NGEdge exclusion_edge = {exclusion.Left(), exclusion.Right()};
-  LayoutUnit block_size = bottom - top;
-  if (block_size > 0) {
-    NGLayoutOpportunity opportunity(left, top, right - left, block_size);
+  LayoutUnit bottom_opportunity_block_size =
+      parent_opportunity.BlockEndOffset() - exclusion.BlockEndOffset();
+  if (bottom_opportunity_block_size > 0) {
+    NGLayoutOpportunity opportunity;
+    opportunity.offset.inline_offset = parent_opportunity.InlineStartOffset();
+    opportunity.offset.block_offset = exclusion.BlockEndOffset();
+    opportunity.size.inline_size = parent_opportunity.InlineSize();
+    opportunity.size.block_size = bottom_opportunity_block_size;
+    NGEdge exclusion_edge = {/* start */ exclusion.InlineStartOffset(),
+                             /* end */ exclusion.InlineEndOffset()};
     return new NGLayoutOpportunityTreeNode(opportunity, exclusion_edge);
   }
   return nullptr;
 }
 
 // Creates the *LEFT* positioned Layout Opportunity tree node by splitting
 // the parent node with the exclusion.
 //
 // @param parent_node Node that needs to be split.
 // @param exclusion Exclusion existed in the parent node constraint space.
 // @return New node or nullptr if the new inline size == 0 or the parent's
 // exclusion edge doesn't limit the new node's constraint space.
 NGLayoutOpportunityTreeNode* CreateLeftNGLayoutOpportunityTreeNode(
     const NGLayoutOpportunityTreeNode* parent_node,
-    const NGExclusion& exclusion) {
+    const NGLogicalRect& exclusion) {
   const NGLayoutOpportunity& parent_opportunity = parent_node->opportunity;
-  LayoutUnit left = parent_opportunity.offset.inline_offset;
-  LayoutUnit top = parent_opportunity.offset.block_offset;
-  LayoutUnit right = exclusion.Left();
-  LayoutUnit bottom = top + parent_opportunity.size.block_size;
 
-  NGEdge node_edge = {left, right};
-  LayoutUnit inline_size = right - left;
-  if (inline_size > 0 &&
+  LayoutUnit left_opportunity_inline_size =
+      exclusion.InlineStartOffset() - parent_opportunity.InlineStartOffset();
+  NGEdge node_edge = {/* start */ parent_opportunity.InlineStartOffset(),
+                      /* end */ exclusion.InlineStartOffset()};
+
+  if (left_opportunity_inline_size > 0 &&
       IsOverlapping(parent_node->exclusion_edge, node_edge)) {
-    NGLayoutOpportunity opportunity(left, top, inline_size, bottom - top);
+    NGLayoutOpportunity opportunity;
+    opportunity.offset.inline_offset = parent_opportunity.InlineStartOffset();
+    opportunity.offset.block_offset = parent_opportunity.BlockStartOffset();
+    opportunity.size.inline_size = left_opportunity_inline_size;
+    opportunity.size.block_size = parent_opportunity.BlockSize();
     return new NGLayoutOpportunityTreeNode(opportunity);
   }
   return nullptr;
 }
 
 // Creates the *RIGHT* positioned Layout Opportunity tree node by splitting
 // the parent node with the exclusion.
 //
 // @param parent_node Node that needs to be split.
 // @param exclusion Exclusion existed in the parent node constraint space.
 // @return New node or nullptr if the new inline size == 0 or the parent's
 // exclusion edge doesn't limit the new node's constraint space.
 NGLayoutOpportunityTreeNode* CreateRightNGLayoutOpportunityTreeNode(
     const NGLayoutOpportunityTreeNode* parent_node,
-    const NGExclusion& exclusion) {
+    const NGLogicalRect& exclusion) {
   const NGLayoutOpportunity& parent_opportunity = parent_node->opportunity;
-  LayoutUnit left = exclusion.Right();
-  LayoutUnit top = parent_opportunity.offset.block_offset;
-  LayoutUnit right = parent_opportunity.offset.inline_offset +
-                     parent_opportunity.size.inline_size;
-  LayoutUnit bottom = top + parent_opportunity.size.block_size;
 
-  NGEdge node_edge = {left, right};
-  LayoutUnit inline_size = right - left;
-  if (inline_size > 0 &&
+  NGEdge node_edge = {/* start */ exclusion.InlineEndOffset(),
+                      /* end */ parent_opportunity.InlineEndOffset()};
+  LayoutUnit right_opportunity_inline_size =
+      parent_opportunity.InlineEndOffset() - exclusion.InlineEndOffset();
+  if (right_opportunity_inline_size > 0 &&
       IsOverlapping(parent_node->exclusion_edge, node_edge)) {
-    NGLayoutOpportunity opportunity(left, top, inline_size, bottom - top);
+    NGLayoutOpportunity opportunity;
+    opportunity.offset.inline_offset = exclusion.InlineEndOffset();
+    opportunity.offset.block_offset = parent_opportunity.BlockStartOffset();
+    opportunity.size.inline_size = right_opportunity_inline_size;
+    opportunity.size.block_size = parent_opportunity.BlockSize();
     return new NGLayoutOpportunityTreeNode(opportunity);
   }
   return nullptr;
 }
 
 // Gets/Creates the "TOP" positioned constraint space by splitting
 // the parent node with the exclusion.
 //
-// @param parent_node Node that needs to be split.
+// @param parent_opportunity Parent opportunity that is being split.
 // @param exclusion Exclusion existed in the parent node constraint space.
 // @return New node or nullptr if the new block size == 0.
-NGLayoutOpportunity GetTopSpace(const NGLayoutOpportunity& rect,
-                                const NGExclusion& exclusion) {
-  LayoutUnit left = rect.offset.inline_offset;
-  LayoutUnit top = rect.offset.block_offset;
-  LayoutUnit right = left + rect.size.inline_size;
-  LayoutUnit bottom = exclusion.Top();
-
-  LayoutUnit block_size = bottom - top;
-  if (block_size > 0)
-    return NGLayoutOpportunity(left, top, right - left, block_size);
-
+NGLayoutOpportunity GetTopSpace(const NGLayoutOpportunity& parent_opportunity,
+                                const NGLogicalRect& exclusion) {
+  LayoutUnit top_opportunity_block_size =
+      exclusion.BlockStartOffset() - parent_opportunity.BlockStartOffset();
+  if (top_opportunity_block_size > 0) {
+    NGLayoutOpportunity opportunity;
+    opportunity.offset.inline_offset = parent_opportunity.InlineStartOffset();
+    opportunity.offset.block_offset = parent_opportunity.BlockStartOffset();
+    opportunity.size.inline_size = parent_opportunity.InlineSize();
+    opportunity.size.block_size = top_opportunity_block_size;
+    return opportunity;
+  }
   return NGLayoutOpportunity();
 }
 
 // Inserts the exclusion into the Layout Opportunity tree.
 void InsertExclusion(NGLayoutOpportunityTreeNode* node,
-                     const NGExclusion* exclusion,
+                     const NGLogicalRect* exclusion,
                      NGLayoutOpportunities& opportunities) {
   // Base case: there is no node.
   if (!node)
     return;
 
   // Base case: exclusion is not in the node's constraint space.
-  if (!IsExclusionWithinSpace(node->opportunity, *exclusion))
+  if (!exclusion->IsContained(node->opportunity))
     return;
 
   if (node->exclusion) {
     InsertExclusion(node->left, exclusion, opportunities);
     InsertExclusion(node->bottom, exclusion, opportunities);
     InsertExclusion(node->right, exclusion, opportunities);
     return;
   }
 
   // Split the current node.
   node->left = CreateLeftNGLayoutOpportunityTreeNode(node, *exclusion);
   node->right = CreateRightNGLayoutOpportunityTreeNode(node, *exclusion);
   node->bottom = CreateBottomNGLayoutOpportunityTreeNode(node, *exclusion);
 
   NGLayoutOpportunity top_layout_opp =
       GetTopSpace(node->opportunity, *exclusion);
   if (!top_layout_opp.IsEmpty())
     opportunities.append(top_layout_opp);
 
   node->exclusion = exclusion;
 }
 
 // Compares exclusions by their top position.
-bool CompareNGExclusionsByTopAsc(const Member<const NGExclusion>& lhs,
-                                 const Member<const NGExclusion>& rhs) {
-  return rhs->Top() > lhs->Top();
+bool CompareNGExclusionsByTopAsc(
+    const std::unique_ptr<const NGLogicalRect>& lhs,
+    const std::unique_ptr<const NGLogicalRect>& rhs) {
+  return rhs->offset.block_offset > lhs->offset.block_offset;
 }
 
 // Compares Layout Opportunities by Start Point.
 // Start point is a TopLeft position from where inline content can potentially
 // start positioning itself.
 bool CompareNGLayoutOpportunitesByStartPoint(const NGLayoutOpportunity& lhs,
                                              const NGLayoutOpportunity& rhs) {
   // sort by TOP.
   if (rhs.offset.block_offset > lhs.offset.block_offset) {
     return true;
@@ skipping 15 matching lines @@
 }
 
 }  // namespace
 
 NGLayoutOpportunityIterator::NGLayoutOpportunityIterator(
     NGConstraintSpace* space,
     const NGLogicalOffset origin_point,
     const NGLogicalOffset leader_point)
     : constraint_space_(space), leader_point_(leader_point) {
   // TODO(chrome-layout-team): Combine exclusions that shadow each other.
-  auto exclusions = constraint_space_->PhysicalSpace()->Exclusions();
+  auto& exclusions = constraint_space_->PhysicalSpace()->Exclusions();
   DCHECK(std::is_sorted(exclusions.begin(), exclusions.end(),
                         &CompareNGExclusionsByTopAsc))
       << "Exclusions are expected to be sorted by TOP";
 
   NGLayoutOpportunity initial_opportunity =
       CreateLayoutOpportunityFromConstraintSpace(*space, origin_point);
   opportunity_tree_root_ = new NGLayoutOpportunityTreeNode(initial_opportunity);
 
-  for (const auto exclusion : exclusions) {
-    InsertExclusion(MutableOpportunityTreeRoot(), exclusion, opportunities_);
+  for (const auto& exclusion : exclusions) {
+    InsertExclusion(MutableOpportunityTreeRoot(), exclusion.get(),
+                    opportunities_);
   }
   CollectAllOpportunities(OpportunityTreeRoot(), opportunities_);
   std::sort(opportunities_.begin(), opportunities_.end(),
             &CompareNGLayoutOpportunitesByStartPoint);
 
   opportunity_iter_ = opportunities_.begin();
 }
 
 const NGLayoutOpportunity NGLayoutOpportunityIterator::Next() {
   if (opportunity_iter_ == opportunities_.end())
     return NGLayoutOpportunity();
   auto* opportunity = opportunity_iter_;
   opportunity_iter_++;
   return NGLayoutOpportunity(*opportunity);
 }
 
 }  // namespace blink