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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use crate::context::LayoutContext;
use crate::display_list::IsContentful;
use crate::dom_traversal::{Contents, NodeExt};
use crate::flow::construct::ContainsFloats;
use crate::flow::float::FloatBox;
use crate::flow::{BlockContainer, BlockFormattingContext, BlockLevelBox};
use crate::formatting_contexts::IndependentFormattingContext;
use crate::fragments::Fragment;
use crate::geom;
use crate::geom::flow_relative::Vec2;
use crate::positioned::AbsolutelyPositionedBox;
use crate::replaced::ReplacedContent;
use crate::style_ext::{
Direction, Display, DisplayGeneratingBox, DisplayInside, DisplayOutside, WritingMode,
};
use crate::{ContainingBlock, DefiniteContainingBlock};
use rayon::iter::{IntoParallelRefIterator, ParallelExtend, ParallelIterator};
use script_layout_interface::wrapper_traits::LayoutNode;
use servo_arc::Arc;
use style::context::SharedStyleContext;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthOrAuto};
use style::Zero;
use style_traits::CSSPixel;
pub struct BoxTreeRoot(BlockFormattingContext);
pub struct FragmentTreeRoot(Vec<Fragment>);
impl BoxTreeRoot {
pub fn construct<'dom, Node>(context: &SharedStyleContext<'_>, root_element: Node) -> Self
where
Node: 'dom + Copy + LayoutNode + Send + Sync,
{
let (contains_floats, boxes) = construct_for_root_element(&context, root_element);
Self(BlockFormattingContext {
contains_floats: contains_floats == ContainsFloats::Yes,
contents: BlockContainer::BlockLevelBoxes(boxes),
})
}
}
fn construct_for_root_element<'dom>(
context: &SharedStyleContext<'_>,
root_element: impl NodeExt<'dom>,
) -> (ContainsFloats, Vec<Arc<BlockLevelBox>>) {
let style = root_element.style(context);
let replaced = ReplacedContent::for_element(root_element, context);
let box_style = style.get_box();
let display_inside = match Display::from(box_style.display) {
Display::None => return (ContainsFloats::No, Vec::new()),
Display::Contents if replaced.is_some() => {
// 'display: contents' computes to 'none' for replaced elements
return (ContainsFloats::No, Vec::new());
},
// https://drafts.csswg.org/css-display-3/#transformations
Display::Contents => DisplayInside::Flow,
// The root element is blockified, ignore DisplayOutside
Display::GeneratingBox(DisplayGeneratingBox::OutsideInside { inside, .. }) => inside,
};
if let Some(replaced) = replaced {
let _box = match replaced {};
#[allow(unreachable_code)]
{
return (ContainsFloats::No, vec![Arc::new(_box)]);
}
}
let position = box_style.position;
let float = box_style.float;
let contents = IndependentFormattingContext::construct(
context,
style,
display_inside,
Contents::OfElement(root_element),
);
if position.is_absolutely_positioned() {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(
AbsolutelyPositionedBox { contents },
))],
)
} else if float.is_floating() {
(
ContainsFloats::Yes,
vec![Arc::new(BlockLevelBox::OutOfFlowFloatBox(FloatBox {
contents,
}))],
)
} else {
(
ContainsFloats::No,
vec![Arc::new(BlockLevelBox::Independent(contents))],
)
}
}
impl BoxTreeRoot {
pub fn layout(
&self,
layout_context: &LayoutContext,
viewport: geom::Size<CSSPixel>,
) -> FragmentTreeRoot {
let initial_containing_block_size = Vec2 {
inline: Length::new(viewport.width),
block: Length::new(viewport.height),
};
let initial_containing_block = ContainingBlock {
inline_size: initial_containing_block_size.inline,
block_size: LengthOrAuto::LengthPercentage(initial_containing_block_size.block),
// FIXME: use the document’s mode:
// https://drafts.csswg.org/css-writing-modes/#principal-flow
mode: (WritingMode::HorizontalTb, Direction::Ltr),
};
let dummy_tree_rank = 0;
let mut absolutely_positioned_fragments = vec![];
let mut independent_layout = self.0.layout(
layout_context,
&initial_containing_block,
dummy_tree_rank,
&mut absolutely_positioned_fragments,
);
let initial_containing_block = DefiniteContainingBlock {
size: initial_containing_block_size,
mode: initial_containing_block.mode,
};
independent_layout.fragments.par_extend(
absolutely_positioned_fragments
.par_iter()
.map(|a| a.layout(layout_context, &initial_containing_block)),
);
FragmentTreeRoot(independent_layout.fragments)
}
}
impl FragmentTreeRoot {
pub fn build_display_list(
&self,
builder: &mut crate::display_list::DisplayListBuilder,
pipeline_id: msg::constellation_msg::PipelineId,
viewport_size: webrender_api::units::LayoutSize,
) -> IsContentful {
let containing_block = geom::physical::Rect {
top_left: geom::physical::Vec2 {
x: Length::zero(),
y: Length::zero(),
},
size: geom::physical::Vec2 {
x: Length::new(viewport_size.width),
y: Length::new(viewport_size.height),
},
};
let mut is_contentful = IsContentful(false);
for fragment in &self.0 {
fragment.build_display_list(builder, &mut is_contentful, &containing_block)
}
is_contentful
}
}
|
