1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
// 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* break_token;
std::unique_ptr<Vector<NGPhysicalOutOfFlowPositionedNode>>
oof_positioned_descendants_;
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,
NGLink* buffer,
NGFragmentType type,
unsigned sub_type)
: NGPhysicalFragment(builder, type, sub_type),
break_token_(std::move(builder->break_token_)),
oof_positioned_descendants_(
builder->oof_positioned_descendants_.IsEmpty()
? nullptr
: new Vector<NGPhysicalOutOfFlowPositionedNode>()),
buffer_(buffer),
num_children_(builder->children_.size()) {
has_floating_descendants_for_paint_ =
builder->has_floating_descendants_for_paint_;
has_adjoining_object_descendants_ =
builder->has_adjoining_object_descendants_;
has_orthogonal_flow_roots_ = builder->has_orthogonal_flow_roots_;
may_have_descendant_above_block_start_ =
builder->may_have_descendant_above_block_start_;
depends_on_percentage_block_size_ = DependsOnPercentageBlockSize(*builder);
PhysicalSize size = Size();
if (oof_positioned_descendants_) {
oof_positioned_descendants_->ReserveCapacity(
builder->oof_positioned_descendants_.size());
for (const auto& descendant : builder->oof_positioned_descendants_) {
oof_positioned_descendants_->emplace_back(
descendant.node,
descendant.static_position.ConvertToPhysical(
builder->Style().GetWritingMode(), builder->Direction(), size),
descendant.inline_container);
}
}
// 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.fragment.get();
buffer[i].fragment->AddRef();
buffer[i].offset = child.offset.ConvertToPhysical(
block_or_line_writing_mode, builder->Direction(), size,
child.fragment->Size());
++i;
}
}
NGPhysicalContainerFragment::~NGPhysicalContainerFragment() = default;
// additional_offset must be offset from the containing_block.
void NGPhysicalContainerFragment::AddOutlineRectsForNormalChildren(
Vector<PhysicalRect>* outline_rects,
const PhysicalOffset& additional_offset,
NGOutlineType outline_type,
const LayoutBoxModelObject* containing_block) const {
for (const auto& child : PostLayoutChildren()) {
// 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 (!child->IsLineBox()) {
const LayoutObject* child_layout_object = child->GetLayoutObject();
if (auto* child_layout_block_flow =
DynamicTo<LayoutBlockFlow>(child_layout_object)) {
if (child_layout_object->IsElementContinuation() ||
child_layout_block_flow->IsAnonymousBlockContinuation())
continue;
}
}
AddOutlineRectsForDescendant(child, outline_rects, additional_offset,
outline_type, containing_block);
}
}
// additional_offset must be offset from the containing_block because
// LocalToAncestorRect returns rects wrt containing_block.
void NGPhysicalContainerFragment::AddOutlineRectsForDescendant(
const NGLink& descendant,
Vector<PhysicalRect>* outline_rects,
const PhysicalOffset& additional_offset,
NGOutlineType outline_type,
const LayoutBoxModelObject* containing_block) const {
if (descendant->IsText() || descendant->IsListMarker())
return;
if (const auto* descendant_box =
DynamicTo<NGPhysicalBoxFragment>(descendant.get())) {
const LayoutObject* descendant_layout_object =
descendant_box->GetLayoutObject();
// TODO(layoutng): Explain this check. I assume we need it because layers
// may have transforms and so we have to go through LocalToAncestorRects?
if (descendant_box->HasLayer()) {
DCHECK(descendant_layout_object);
Vector<PhysicalRect> layer_outline_rects;
descendant_box->AddSelfOutlineRects(PhysicalOffset(), outline_type,
&layer_outline_rects);
// Don't pass additional_offset because LocalToAncestorRects will itself
// apply it.
descendant_layout_object->LocalToAncestorRects(
layer_outline_rects, containing_block, PhysicalOffset(),
PhysicalOffset());
outline_rects->AppendVector(layer_outline_rects);
return;
}
if (!descendant_box->IsInlineBox()) {
descendant_box->AddSelfOutlineRects(
additional_offset + descendant.Offset(), outline_type, outline_rects);
return;
}
DCHECK(descendant_layout_object);
DCHECK(descendant_layout_object->IsLayoutInline());
const 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::ShouldPaintOutline(*descendant_box)) {
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(), outline_type,
containing_block);
if (!descendant_line_box->Size().IsEmpty()) {
outline_rects->emplace_back(additional_offset,
descendant_line_box->Size().ToLayoutSize());
} else if (descendant_line_box->Children().empty()) {
// 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);
}
}
}
}
}
bool NGPhysicalContainerFragment::DependsOnPercentageBlockSize(
const NGContainerFragmentBuilder& builder) {
NGLayoutInputNode node = builder.node_;
if (!node || node.IsInline())
return builder.has_descendant_that_depends_on_percentage_block_size_;
// NOTE: If an element is OOF positioned, and has top/bottom constraints
// which are percentage based, this function will return false.
//
// This is fine as the top/bottom constraints are computed *before* layout,
// and the result is set as a fixed-block-size constraint. (And the caching
// logic will never check the result of this function).
//
// The result of this function still may be used for an OOF positioned
// element if it has a percentage block-size however, but this will return
// the correct result from below.
if ((builder.has_descendant_that_depends_on_percentage_block_size_ ||
builder.is_legacy_layout_root_) &&
node.UseParentPercentageResolutionBlockSizeForChildren()) {
// Quirks mode has different %-block-size behaviour, than standards mode.
// An arbitrary descendant may depend on the percentage resolution
// block-size given.
// If this is also an anonymous block we need to mark ourselves dependent
// if we have a dependent child.
return true;
}
const ComputedStyle& style = builder.Style();
if (style.LogicalHeight().IsPercentOrCalc() ||
style.LogicalMinHeight().IsPercentOrCalc() ||
style.LogicalMaxHeight().IsPercentOrCalc())
return true;
return false;
}
} // namespace blink
|
