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// Copyright 2017 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 "third_party/blink/renderer/core/layout/ng/inline/ng_inline_fragment_traversal.h"
#include "third_party/blink/renderer/core/layout/layout_inline.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
#include "third_party/blink/renderer/core/paint/ng/ng_paint_fragment.h"
namespace blink {
namespace {
using Result = NGPhysicalFragmentWithOffset;
class NGPhysicalFragmentCollectorBase {
STACK_ALLOCATED();
public:
virtual Vector<Result> CollectFrom(const NGPhysicalFragment&) = 0;
protected:
explicit NGPhysicalFragmentCollectorBase() = default;
virtual void Visit() = 0;
const NGPhysicalFragment& GetFragment() const { return *current_fragment_; }
void SetShouldStopTraversing() { should_stop_traversing_ = true; }
bool HasStoppedTraversing() const { return should_stop_traversing_; }
void Emit() {
results_.push_back(Result{current_fragment_, current_offset_to_root_});
}
// Visits and collets fragments in the subtree rooted at |fragment|.
// |fragment| itself is not visited.
Vector<Result> CollectExclusivelyFrom(const NGPhysicalFragment& fragment) {
current_fragment_ = &fragment;
root_fragment_ = &fragment;
VisitChildren();
return std::move(results_);
}
// Visits and collets fragments in the subtree rooted at |fragment|.
// |fragment| itself is visited.
Vector<Result> CollectInclusivelyFrom(const NGPhysicalFragment& fragment) {
current_fragment_ = &fragment;
root_fragment_ = &fragment;
Visit();
return std::move(results_);
}
void VisitChildren() {
if (should_stop_traversing_)
return;
const NGPhysicalFragment& fragment = *current_fragment_;
if (!fragment.IsContainer())
return;
// Traverse descendants unless the fragment is laid out separately from the
// inline layout algorithm.
if (&fragment != root_fragment_ && fragment.IsFormattingContextRoot())
return;
DCHECK(fragment.IsContainer());
DCHECK(fragment.IsInline() || fragment.IsLineBox() ||
(fragment.IsBlockFlow() &&
To<NGPhysicalBoxFragment>(fragment).IsInlineFormattingContext()));
for (const auto& child :
To<NGPhysicalContainerFragment>(fragment).Children()) {
base::AutoReset<PhysicalOffset> offset_resetter(
¤t_offset_to_root_, current_offset_to_root_ + child.Offset());
base::AutoReset<const NGPhysicalFragment*> fragment_resetter(
¤t_fragment_, child.get());
Visit();
if (should_stop_traversing_)
return;
}
}
private:
const NGPhysicalFragment* root_fragment_ = nullptr;
const NGPhysicalFragment* current_fragment_ = nullptr;
PhysicalOffset current_offset_to_root_;
Vector<Result> results_;
bool should_stop_traversing_ = false;
DISALLOW_COPY_AND_ASSIGN(NGPhysicalFragmentCollectorBase);
};
// The visitor emitting all visited fragments.
class DescendantCollector final : public NGPhysicalFragmentCollectorBase {
STACK_ALLOCATED();
public:
DescendantCollector() = default;
Vector<Result> CollectFrom(const NGPhysicalFragment& fragment) final {
return CollectExclusivelyFrom(fragment);
}
private:
void Visit() final {
Emit();
VisitChildren();
}
DISALLOW_COPY_AND_ASSIGN(DescendantCollector);
};
// The visitor emitting fragments generated from the given LayoutInline,
// supporting culled inline.
// Note: Since we apply culled inline per line, we have a fragment for
// LayoutInline in second line but not in first line in
// "t0803-c5502-imrgn-r-01-b-ag.html".
class LayoutInlineCollector final : public NGPhysicalFragmentCollectorBase {
STACK_ALLOCATED();
public:
explicit LayoutInlineCollector(const LayoutInline& container) {
CollectInclusiveDescendants(container);
}
Vector<Result> CollectFrom(const NGPhysicalFragment& fragment) final {
return CollectExclusivelyFrom(fragment);
}
private:
void Visit() final {
if (!GetFragment().IsLineBox() &&
inclusive_descendants_.Contains(GetFragment().GetLayoutObject())) {
Emit();
return;
}
VisitChildren();
}
void CollectInclusiveDescendants(const LayoutInline& container) {
inclusive_descendants_.insert(&container);
for (const LayoutObject* node = container.FirstChild(); node;
node = node->NextSibling()) {
if (node->IsFloatingOrOutOfFlowPositioned())
continue;
if (node->IsBox() || node->IsText()) {
inclusive_descendants_.insert(node);
continue;
}
if (!node->IsLayoutInline())
continue;
CollectInclusiveDescendants(ToLayoutInline(*node));
}
}
HashSet<const LayoutObject*> inclusive_descendants_;
DISALLOW_COPY_AND_ASSIGN(LayoutInlineCollector);
};
} // namespace
// static
Vector<Result> NGInlineFragmentTraversal::SelfFragmentsOf(
const NGPhysicalContainerFragment& container,
const LayoutObject* layout_object) {
if (const LayoutInline* layout_inline = ToLayoutInlineOrNull(layout_object)) {
// TODO(crbug.com/874361): Stop partial culling of inline boxes, so that we
// can simply check existence of paint fragments below.
if (!layout_inline->HasSelfPaintingLayer()) {
return LayoutInlineCollector(ToLayoutInline(*layout_object))
.CollectFrom(container);
}
}
Vector<Result> result;
for (const NGPaintFragment* fragment :
NGPaintFragment::InlineFragmentsFor(layout_object)) {
result.push_back(Result{&fragment->PhysicalFragment(),
fragment->OffsetInContainerBlock()});
}
return result;
}
// static
Vector<Result> NGInlineFragmentTraversal::DescendantsOf(
const NGPhysicalContainerFragment& container) {
return DescendantCollector().CollectFrom(container);
}
} // namespace blink
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