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
|
/* 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 task.
#![deny(unsafe_code)]
use app_units::Au;
use canvas_traits::CanvasMsg;
use euclid::Rect;
use fnv::FnvHasher;
use gfx::font_cache_task::FontCacheTask;
use gfx::font_context::FontContext;
use gfx_traits::LayerId;
use ipc_channel::ipc::{self, IpcSender};
use net_traits::image::base::Image;
use net_traits::image_cache_task::{ImageCacheChan, ImageCacheTask, ImageResponse, ImageState};
use net_traits::image_cache_task::{UsePlaceholder};
use std::cell::{RefCell, RefMut};
use std::collections::HashMap;
use std::collections::hash_state::DefaultState;
use std::rc::Rc;
use std::sync::mpsc::{Sender, channel};
use std::sync::{Arc, Mutex};
use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
use style::matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
use url::Url;
use util::mem::HeapSizeOf;
use util::opts;
struct LocalLayoutContext {
style_context: LocalStyleContext,
font_context: RefCell<FontContext>,
}
impl HeapSizeOf for LocalLayoutContext {
// FIXME(njn): measure other fields eventually.
fn heap_size_of_children(&self) -> usize {
self.font_context.heap_size_of_children()
}
}
thread_local!(static LOCAL_CONTEXT_KEY: RefCell<Option<Rc<LocalLayoutContext>>> = RefCell::new(None));
pub fn heap_size_of_local_context() -> usize {
LOCAL_CONTEXT_KEY.with(|r| {
r.borrow().clone().map_or(0, |context| context.heap_size_of_children())
})
}
fn create_or_get_local_context(shared_layout_context: &SharedLayoutContext)
-> Rc<LocalLayoutContext> {
LOCAL_CONTEXT_KEY.with(|r| {
let mut r = r.borrow_mut();
if let Some(context) = r.clone() {
if shared_layout_context.style_context.screen_size_changed {
context.style_context.applicable_declarations_cache.borrow_mut().evict_all();
}
context
} else {
let font_cache_task = shared_layout_context.font_cache_task.lock().unwrap().clone();
let context = Rc::new(LocalLayoutContext {
style_context: LocalStyleContext {
applicable_declarations_cache: RefCell::new(ApplicableDeclarationsCache::new()),
style_sharing_candidate_cache: RefCell::new(StyleSharingCandidateCache::new()),
},
font_context: RefCell::new(FontContext::new(font_cache_task)),
});
*r = Some(context.clone());
context
}
})
}
/// Layout information shared among all workers. This must be thread-safe.
pub struct SharedLayoutContext {
/// Bits shared by the layout and style system.
pub style_context: SharedStyleContext,
/// The shared image cache task.
pub image_cache_task: ImageCacheTask,
/// A channel for the image cache to send responses to.
pub image_cache_sender: Mutex<ImageCacheChan>,
/// Interface to the font cache task.
pub font_cache_task: Mutex<FontCacheTask>,
/// The URL.
pub url: Url,
/// A channel to send canvas renderers to paint task, in order to correctly paint the layers
pub canvas_layers_sender: Mutex<Sender<(LayerId, IpcSender<CanvasMsg>)>>,
/// The visible rects for each layer, as reported to us by the compositor.
pub visible_rects: Arc<HashMap<LayerId, Rect<Au>, DefaultState<FnvHasher>>>,
}
pub struct LayoutContext<'a> {
pub shared: &'a SharedLayoutContext,
cached_local_layout_context: Rc<LocalLayoutContext>,
}
impl<'a> StyleContext<'a> for LayoutContext<'a> {
fn shared_context(&self) -> &'a SharedStyleContext {
&self.shared.style_context
}
fn local_context(&self) -> &LocalStyleContext {
&self.cached_local_layout_context.style_context
}
}
impl<'a> LayoutContext<'a> {
pub fn new(shared_layout_context: &'a SharedLayoutContext) -> LayoutContext<'a> {
let local_context = create_or_get_local_context(shared_layout_context);
LayoutContext {
shared: shared_layout_context,
cached_local_layout_context: local_context,
}
}
#[inline(always)]
pub fn font_context(&self) -> RefMut<FontContext> {
self.cached_local_layout_context.font_context.borrow_mut()
}
pub fn get_or_request_image(&self, url: Url, use_placeholder: UsePlaceholder)
-> Option<Arc<Image>> {
// See if the image is already available
let result = self.shared.image_cache_task.find_image(url.clone(),
use_placeholder);
match result {
Ok(image) => Some(image),
Err(state) => {
// If we are emitting an output file, then we need to block on
// image load or we risk emitting an output file missing the image.
let is_sync = opts::get().output_file.is_some() ||
opts::get().exit_after_load;
match (state, is_sync) {
// Image failed to load, so just return nothing
(ImageState::LoadError, _) => None,
// Not loaded, test mode - load the image synchronously
(_, true) => {
let (sync_tx, sync_rx) = ipc::channel().unwrap();
self.shared.image_cache_task.request_image(url,
ImageCacheChan(sync_tx),
None);
match sync_rx.recv().unwrap().image_response {
ImageResponse::Loaded(image) |
ImageResponse::PlaceholderLoaded(image) => Some(image),
ImageResponse::None => None,
}
}
// Not yet requested, async mode - request image from the cache
(ImageState::NotRequested, false) => {
let sender = self.shared.image_cache_sender.lock().unwrap().clone();
self.shared.image_cache_task.request_image(url, sender, None);
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.
(ImageState::Pending, false) => None,
}
}
}
}
}
|
