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
|
/* 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 http://mozilla.org/MPL/2.0/. */
//! Data needed by the layout thread.
use crate::display_list::items::{OpaqueNode, WebRenderImageInfo};
use crate::opaque_node::OpaqueNodeMethods;
use fnv::FnvHasher;
use gfx::font_cache_thread::FontCacheThread;
use gfx::font_context::FontContext;
use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
use msg::constellation_msg::PipelineId;
use net_traits::image_cache::{CanRequestImages, ImageCache, ImageState};
use net_traits::image_cache::{ImageOrMetadataAvailable, UsePlaceholder};
use parking_lot::RwLock;
use script_layout_interface::{PendingImage, PendingImageState};
use script_traits::Painter;
use script_traits::UntrustedNodeAddress;
use servo_atoms::Atom;
use servo_url::ServoUrl;
use std::cell::{RefCell, RefMut};
use std::collections::HashMap;
use std::hash::BuildHasherDefault;
use std::sync::{Arc, Mutex};
use std::thread;
use style::context::RegisteredSpeculativePainter;
use style::context::SharedStyleContext;
pub type LayoutFontContext = FontContext<FontCacheThread>;
thread_local!(static FONT_CONTEXT_KEY: RefCell<Option<LayoutFontContext>> = RefCell::new(None));
pub fn with_thread_local_font_context<F, R>(layout_context: &LayoutContext, f: F) -> R
where
F: FnOnce(&mut LayoutFontContext) -> R,
{
FONT_CONTEXT_KEY.with(|k| {
let mut font_context = k.borrow_mut();
if font_context.is_none() {
let font_cache_thread = layout_context.font_cache_thread.lock().unwrap().clone();
*font_context = Some(FontContext::new(font_cache_thread));
}
f(&mut RefMut::map(font_context, |x| x.as_mut().unwrap()))
})
}
pub fn malloc_size_of_persistent_local_context(ops: &mut MallocSizeOfOps) -> usize {
FONT_CONTEXT_KEY.with(|r| {
if let Some(ref context) = *r.borrow() {
context.size_of(ops)
} else {
0
}
})
}
/// Layout information shared among all workers. This must be thread-safe.
pub struct LayoutContext<'a> {
/// The pipeline id of this LayoutContext.
pub id: PipelineId,
/// Bits shared by the layout and style system.
pub style_context: SharedStyleContext<'a>,
/// Reference to the script thread image cache.
pub image_cache: Arc<ImageCache>,
/// Interface to the font cache thread.
pub font_cache_thread: Mutex<FontCacheThread>,
/// A cache of WebRender image info.
pub webrender_image_cache: Arc<
RwLock<
HashMap<(ServoUrl, UsePlaceholder), WebRenderImageInfo, BuildHasherDefault<FnvHasher>>,
>,
>,
/// Paint worklets
pub registered_painters: &'a RegisteredPainters,
/// A list of in-progress image loads to be shared with the script thread.
/// A None value means that this layout was not initiated by the script thread.
pub pending_images: Option<Mutex<Vec<PendingImage>>>,
/// A list of nodes that have just initiated a CSS transition.
/// A None value means that this layout was not initiated by the script thread.
pub newly_transitioning_nodes: Option<Mutex<Vec<UntrustedNodeAddress>>>,
}
impl<'a> Drop for LayoutContext<'a> {
fn drop(&mut self) {
if !thread::panicking() {
if let Some(ref pending_images) = self.pending_images {
assert!(pending_images.lock().unwrap().is_empty());
}
}
}
}
impl<'a> LayoutContext<'a> {
#[inline(always)]
pub fn shared_context(&self) -> &SharedStyleContext {
&self.style_context
}
pub fn get_or_request_image_or_meta(
&self,
node: OpaqueNode,
url: ServoUrl,
use_placeholder: UsePlaceholder,
) -> Option<ImageOrMetadataAvailable> {
//XXXjdm For cases where we do not request an image, we still need to
// ensure the node gets another script-initiated reflow or it
// won't be requested at all.
let can_request = if self.pending_images.is_some() {
CanRequestImages::Yes
} else {
CanRequestImages::No
};
// See if the image is already available
let result =
self.image_cache
.find_image_or_metadata(url.clone(), use_placeholder, can_request);
match result {
Ok(image_or_metadata) => Some(image_or_metadata),
// Image failed to load, so just return nothing
Err(ImageState::LoadError) => None,
// Not yet requested - request image or metadata from the cache
Err(ImageState::NotRequested(id)) => {
let image = PendingImage {
state: PendingImageState::Unrequested(url),
node: node.to_untrusted_node_address(),
id: id,
};
self.pending_images
.as_ref()
.unwrap()
.lock()
.unwrap()
.push(image);
None
},
// Image has been requested, is still pending. Return no image for this paint loop.
// When the image loads it will trigger a reflow and/or repaint.
Err(ImageState::Pending(id)) => {
//XXXjdm if self.pending_images is not available, we should make sure that
// this node gets marked dirty again so it gets a script-initiated
// reflow that deals with this properly.
if let Some(ref pending_images) = self.pending_images {
let image = PendingImage {
state: PendingImageState::PendingResponse,
node: node.to_untrusted_node_address(),
id: id,
};
pending_images.lock().unwrap().push(image);
}
None
},
}
}
pub fn get_webrender_image_for_url(
&self,
node: OpaqueNode,
url: ServoUrl,
use_placeholder: UsePlaceholder,
) -> Option<WebRenderImageInfo> {
if let Some(existing_webrender_image) = self
.webrender_image_cache
.read()
.get(&(url.clone(), use_placeholder))
{
return Some((*existing_webrender_image).clone());
}
match self.get_or_request_image_or_meta(node, url.clone(), use_placeholder) {
Some(ImageOrMetadataAvailable::ImageAvailable(image, _)) => {
let image_info = WebRenderImageInfo::from_image(&*image);
if image_info.key.is_none() {
Some(image_info)
} else {
let mut webrender_image_cache = self.webrender_image_cache.write();
webrender_image_cache.insert((url, use_placeholder), image_info);
Some(image_info)
}
},
None | Some(ImageOrMetadataAvailable::MetadataAvailable(_)) => None,
}
}
}
/// A registered painter
pub trait RegisteredPainter: RegisteredSpeculativePainter + Painter {}
/// A set of registered painters
pub trait RegisteredPainters: Sync {
/// Look up a painter
fn get(&self, name: &Atom) -> Option<&RegisteredPainter>;
}
|
