[LayoutNG] Switch NGConstraintSpace to being RefCounted.

third_party/WebKit/Source/core/layout/ng/ng_constraint_space_test.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_constraint_space.h"
 
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_constraint_space_builder.h"
 #include "core/layout/ng/ng_layout_opportunity_iterator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 namespace {
 
-NGConstraintSpace* ConstructConstraintSpace(NGWritingMode writing_mode,
-                                            TextDirection direction,
-                                            NGLogicalSize size) {
+RefPtr<NGConstraintSpace> ConstructConstraintSpace(NGWritingMode writing_mode,
+                                                   TextDirection direction,
+                                                   NGLogicalSize size) {
   return NGConstraintSpaceBuilder(writing_mode)
       .SetTextDirection(direction)
       .SetAvailableSize(size)
       .SetPercentageResolutionSize(size)
       .SetIsFixedSizeInline(true)
       .SetIsInlineDirectionTriggersScrollbar(true)
       .SetFragmentationType(NGFragmentationType::kFragmentColumn)
       .ToConstraintSpace(writing_mode);
 }
 
 static String OpportunityToString(const NGLayoutOpportunity& opportunity) {
   return opportunity.IsEmpty() ? String("(empty)") : opportunity.ToString();
 }
 
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesNoExclusions) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(400);
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
 
-  NGLayoutOpportunityIterator iterator(space);
+  NGLayoutOpportunityIterator iterator(space.get());
   EXPECT_EQ("0,0 600x400", OpportunityToString(iterator.Next()));
   EXPECT_EQ("(empty)", OpportunityToString(iterator.Next()));
 }
 
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesTopRightExclusion) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(400);
   // Create a space with a 100x100 exclusion in the top right corner.
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
   NGExclusion exclusion;
   exclusion.rect.size = {/* inline_size */ LayoutUnit(100),
                          /* block_size */ LayoutUnit(100)};
   exclusion.rect.offset = {/* inline_offset */ LayoutUnit(500),
                            /* block_offset */ LayoutUnit(0)};
   space->AddExclusion(exclusion);
 
-  NGLayoutOpportunityIterator iterator(space);
+  NGLayoutOpportunityIterator iterator(space.get());
   // First opportunity should be to the left of the exclusion.
   EXPECT_EQ("0,0 500x400", OpportunityToString(iterator.Next()));
   // Second opportunity should be below the exclusion.
   EXPECT_EQ("0,100 600x300", OpportunityToString(iterator.Next()));
   // There should be no third opportunity.
   EXPECT_EQ("(empty)", OpportunityToString(iterator.Next()));
 }
 
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesTopLeftExclusion) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(400);
   // Create a space with a 100x100 exclusion in the top left corner.
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
   NGExclusion exclusion;
   exclusion.rect.size = {/* inline_size */ LayoutUnit(100),
                          /* block_size */ LayoutUnit(100)};
   exclusion.rect.offset = {/* inline_offset */ LayoutUnit(0),
                            /* block_offset */ LayoutUnit(0)};
   space->AddExclusion(exclusion);
 
-  NGLayoutOpportunityIterator iterator(space);
+  NGLayoutOpportunityIterator iterator(space.get());
   // First opportunity should be to the right of the exclusion.
   EXPECT_EQ("100,0 500x400", OpportunityToString(iterator.Next()));
   // Second opportunity should be below the exclusion.
   EXPECT_EQ("0,100 600x300", OpportunityToString(iterator.Next()));
   // There should be no third opportunity.
   EXPECT_EQ("(empty)", OpportunityToString(iterator.Next()));
 }
 
 // Verifies that Layout Opportunity iterator produces 7 layout opportunities
 // from 4 start points created by 2 CSS exclusions positioned in the middle of
@@ skipping 15 matching lines @@
 // Expected:
 //   Layout opportunity iterator generates the next opportunities:
 //   - 1st Start Point: 0,0 600x200; 0,0 150x400
 //   - 2nd Start Point: 250,0 350x350; 250,0 250x400
 //   - 3rd Start Point: 550,0 50x400
 //   - 4th Start Point: 0,300 600x50; 0,300 500x100
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesTwoInMiddle) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(400);
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
   // Add exclusions
   NGExclusion exclusion1;
   exclusion1.rect.size = {/* inline_size */ LayoutUnit(100),
                           /* block_size */ LayoutUnit(100)};
   exclusion1.rect.offset = {/* inline_offset */ LayoutUnit(150),
                             /* block_offset */ LayoutUnit(200)};
   space->AddExclusion(exclusion1);
   NGExclusion exclusion2;
   exclusion2.rect.size = {/* inline_size */ LayoutUnit(50),
                           /* block_size */ LayoutUnit(50)};
   exclusion2.rect.offset = {/* inline_offset */ LayoutUnit(500),
                             /* block_offset */ LayoutUnit(350)};
   space->AddExclusion(exclusion2);
 
-  NGLayoutOpportunityIterator iterator(space);
+  NGLayoutOpportunityIterator iterator(space.get());
   // 1st Start point
   EXPECT_EQ("0,0 600x200", OpportunityToString(iterator.Next()));
   EXPECT_EQ("0,0 150x400", OpportunityToString(iterator.Next()));
   // 2nd Start point
   EXPECT_EQ("250,0 350x350", OpportunityToString(iterator.Next()));
   EXPECT_EQ("250,0 250x400", OpportunityToString(iterator.Next()));
   // 3rd Start point
   EXPECT_EQ("550,0 50x400", OpportunityToString(iterator.Next()));
   // 4th Start point
   EXPECT_EQ("0,300 600x50", OpportunityToString(iterator.Next()));
@@ skipping 13 matching lines @@
 //   - 1st Start Point (0, 200): 350x150, 250x400
 //   - 3rd Start Point (550, 200): 50x400
 //   - 4th Start Point (0, 300): 600x50, 500x300
 //   - 5th Start Point (0, 400): 600x200
 //   All other opportunities that are located before the origin point should be
 //   filtered out.
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesTwoInMiddleWithOriginAndLeader) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(400);
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
   // Add exclusions
   NGExclusion exclusion1;
   exclusion1.rect.size = {/* inline_size */ LayoutUnit(100),
                           /* block_size */ LayoutUnit(100)};
   exclusion1.rect.offset = {/* inline_offset */ LayoutUnit(150),
                             /* block_offset */ LayoutUnit(200)};
   space->AddExclusion(exclusion1);
   NGExclusion exclusion2;
   exclusion2.rect.size = {/* inline_size */ LayoutUnit(50),
                           /* block_size */ LayoutUnit(50)};
   exclusion2.rect.offset = {/* inline_offset */ LayoutUnit(500),
                             /* block_offset */ LayoutUnit(350)};
   space->AddExclusion(exclusion2);
 
   const NGLogicalOffset origin_point = {LayoutUnit(0), LayoutUnit(200)};
   const NGLogicalOffset leader_point = {LayoutUnit(250), LayoutUnit(300)};
-  NGLayoutOpportunityIterator iterator(space, origin_point, leader_point);
+  NGLayoutOpportunityIterator iterator(space.get(), origin_point, leader_point);
   // 1st Start Point
   EXPECT_EQ("250,200 350x150", OpportunityToString(iterator.Next()));
   EXPECT_EQ("250,200 250x400", OpportunityToString(iterator.Next()));
   // 2nd Start Point
   EXPECT_EQ("550,200 50x400", OpportunityToString(iterator.Next()));
   // 3rd Start Point
   EXPECT_EQ("0,300 600x50", OpportunityToString(iterator.Next()));
   EXPECT_EQ("0,300 500x300", OpportunityToString(iterator.Next()));
   // 4th Start Point
   EXPECT_EQ("0,400 600x200", OpportunityToString(iterator.Next()));
@@ skipping 14 matching lines @@
 //     +-----------------------------+
 //      ***  <- Exclusion
 //
 // Expected:
 //   Layout opportunity iterator generates only one opportunity that equals to
 //   available constraint space, i.e. 0,0 600x200
 TEST(NGConstraintSpaceTest, LayoutOpportunitiesWithOutOfBoundsExclusions) {
   NGLogicalSize size;
   size.inline_size = LayoutUnit(600);
   size.block_size = LayoutUnit(100);
-  auto* space =
+  RefPtr<NGConstraintSpace> space =
       ConstructConstraintSpace(kHorizontalTopBottom, TextDirection::kLtr, size);
   NGExclusion exclusion;
   exclusion.rect.size = {/* inline_size */ LayoutUnit(100),
                          /* block_size */ LayoutUnit(100)};
   exclusion.rect.offset = {/* inline_offset */ LayoutUnit(0),
                            /* block_offset */ LayoutUnit(150)};
   space->AddExclusion(exclusion);
 
-  NGLayoutOpportunityIterator iterator(space);
+  NGLayoutOpportunityIterator iterator(space.get());
   EXPECT_EQ("0,0 600x100", OpportunityToString(iterator.Next()));
   EXPECT_EQ("(empty)", OpportunityToString(iterator.Next()));
 }
 
 }  // namespace
 }  // namespace blink