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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/ng_physical_container_fragment.h"
#include "third_party/blink/renderer/core/layout/layout_block_flow.h"
#include "third_party/blink/renderer/core/layout/layout_inline.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_physical_line_box_fragment.h"
#include "third_party/blink/renderer/core/layout/ng/ng_container_fragment_builder.h"
#include "third_party/blink/renderer/core/layout/ng/ng_outline_utils.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
#include "third_party/blink/renderer/platform/geometry/layout_rect.h"
namespace blink {
namespace {
struct SameSizeAsNGPhysicalContainerFragment : NGPhysicalFragment {
void* pointer;
wtf_size_t size;
};
static_assert(sizeof(NGPhysicalContainerFragment) ==
sizeof(SameSizeAsNGPhysicalContainerFragment),
"NGPhysicalContainerFragment should stay small");
} // namespace
NGPhysicalContainerFragment::NGPhysicalContainerFragment(
NGContainerFragmentBuilder* builder,
WritingMode block_or_line_writing_mode,
NGLinkStorage* buffer,
NGFragmentType type,
unsigned sub_type)
: NGPhysicalFragment(builder, type, sub_type),
buffer_(buffer),
num_children_(builder->children_.size()) {
has_floating_descendants_ = builder->HasFloatingDescendants();
DCHECK_EQ(builder->children_.size(), builder->offsets_.size());
// Because flexible arrays need to be the last member in a class, we need to
// have the buffer passed as a constructor argument and have the actual
// storage be part of the subclass.
wtf_size_t i = 0;
for (auto& child : builder->children_) {
buffer[i].fragment = child.get();
buffer[i].fragment->AddRef();
buffer[i].offset = builder->offsets_[i].ConvertToPhysical(
block_or_line_writing_mode, builder->Direction(), Size(),
child->Size());
++i;
}
}
void NGPhysicalContainerFragment::AddOutlineRectsForNormalChildren(
Vector<LayoutRect>* outline_rects,
const LayoutPoint& additional_offset,
NGOutlineType outline_type) const {
for (const auto& child : Children()) {
// Outlines of out-of-flow positioned descendants are handled in
// NGPhysicalBoxFragment::AddSelfOutlineRects().
if (child->IsOutOfFlowPositioned())
continue;
// Outline of an element continuation or anonymous block continuation is
// added when we iterate the continuation chain.
// See NGPhysicalBoxFragment::AddSelfOutlineRects().
if (LayoutObject* child_layout_object = child->GetLayoutObject()) {
auto* child_layout_block_flow =
DynamicTo<LayoutBlockFlow>(child_layout_object);
if (child_layout_object->IsElementContinuation() ||
(child_layout_block_flow &&
child_layout_block_flow->IsAnonymousBlockContinuation()))
continue;
}
AddOutlineRectsForDescendant(child, outline_rects, additional_offset,
outline_type);
}
}
void NGPhysicalContainerFragment::AddOutlineRectsForDescendant(
const NGLink& descendant,
Vector<LayoutRect>* outline_rects,
const LayoutPoint& additional_offset,
NGOutlineType outline_type) const {
if (descendant->IsText() || descendant->IsListMarker())
return;
if (const auto* descendant_box =
DynamicTo<NGPhysicalBoxFragment>(descendant.get())) {
LayoutObject* descendant_layout_object = descendant_box->GetLayoutObject();
DCHECK(descendant_layout_object);
if (descendant_box->HasLayer()) {
Vector<LayoutRect> layer_outline_rects;
descendant_box->AddSelfOutlineRects(&layer_outline_rects, LayoutPoint(),
outline_type);
descendant_layout_object->LocalToAncestorRects(
layer_outline_rects, ToLayoutBoxModelObject(GetLayoutObject()),
LayoutPoint(), additional_offset);
outline_rects->AppendVector(layer_outline_rects);
return;
}
if (descendant_layout_object->IsBox()) {
descendant_box->AddSelfOutlineRects(
outline_rects,
additional_offset + descendant.Offset().ToLayoutPoint(),
outline_type);
return;
}
DCHECK(descendant_layout_object->IsLayoutInline());
LayoutInline* descendant_layout_inline =
ToLayoutInline(descendant_layout_object);
// As an optimization, an ancestor has added rects for its line boxes
// covering descendants' line boxes, so descendants don't need to add line
// boxes again. For example, if the parent is a LayoutBlock, it adds rects
// for its line box which cover the line boxes of this LayoutInline. So
// the LayoutInline needs to add rects for children and continuations
// only.
if (!NGOutlineUtils::IsInlineOutlineNonpaintingFragment(*descendant)) {
descendant_layout_inline->AddOutlineRectsForChildrenAndContinuations(
*outline_rects, additional_offset, outline_type);
}
return;
}
if (const auto* descendant_line_box =
DynamicTo<NGPhysicalLineBoxFragment>(descendant.get())) {
descendant_line_box->AddOutlineRectsForNormalChildren(
outline_rects, additional_offset + descendant.Offset().ToLayoutPoint(),
outline_type);
if (!descendant_line_box->Size().IsEmpty()) {
outline_rects->emplace_back(additional_offset,
descendant_line_box->Size().ToLayoutSize());
} else if (descendant_line_box->Children().IsEmpty()) {
// Special-case for when the first continuation does not generate
// fragments. NGInlineLayoutAlgorithm suppresses box fragments when the
// line is "empty". When there is a continuation from the LayoutInline,
// the suppression makes such continuation not reachable. Check the
// continuation from LayoutInline in such case.
DCHECK(GetLayoutObject());
if (LayoutInline* first_layout_inline =
ToLayoutInlineOrNull(GetLayoutObject()->SlowFirstChild())) {
if (!first_layout_inline->IsElementContinuation()) {
first_layout_inline->AddOutlineRectsForChildrenAndContinuations(
*outline_rects, additional_offset, outline_type);
}
}
}
}
}
} // namespace blink
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