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/* 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 to style a Gecko document.
use animation::Animation;
use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
use dom::OpaqueNode;
use euclid::size::TypedSize2D;
use gecko_bindings::bindings::RawGeckoPresContextBorrowed;
use gecko_bindings::bindings::RawServoStyleSet;
use gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
use media_queries::{Device, MediaType};
use num_cpus;
use parking_lot::RwLock;
use properties::ComputedValues;
use rayon;
use std::cmp;
use std::collections::HashMap;
use std::env;
use std::sync::Arc;
use std::sync::mpsc::{Receiver, Sender, channel};
use style_traits::ViewportPx;
use stylesheets::Stylesheet;
use stylist::Stylist;
/// The container for data that a Servo-backed Gecko document needs to style
/// itself.
pub struct PerDocumentStyleDataImpl {
/// Rule processor.
pub stylist: Arc<Stylist>,
/// List of stylesheets, mirrored from Gecko.
pub stylesheets: Vec<Arc<Stylesheet>>,
/// Whether the stylesheets list above has changed since the last restyle.
pub stylesheets_changed: bool,
// FIXME(bholley): Hook these up to something.
/// Unused. Will go away when we actually implement transitions and
/// animations properly.
pub new_animations_sender: Sender<Animation>,
/// Unused. Will go away when we actually implement transitions and
/// animations properly.
pub new_animations_receiver: Receiver<Animation>,
/// Unused. Will go away when we actually implement transitions and
/// animations properly.
pub running_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
/// Unused. Will go away when we actually implement transitions and
/// animations properly.
pub expired_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
/// The worker thread pool.
/// FIXME(bholley): This shouldn't be per-document.
pub work_queue: Option<rayon::ThreadPool>,
/// The number of threads of the work queue.
pub num_threads: usize,
/// Default computed values for this document.
pub default_computed_values: Arc<ComputedValues>
}
/// The data itself is an `AtomicRefCell`, which guarantees the proper semantics
/// and unexpected races while trying to mutate it.
pub struct PerDocumentStyleData(AtomicRefCell<PerDocumentStyleDataImpl>);
lazy_static! {
/// The number of layout threads, computed statically.
pub static ref NUM_THREADS: usize = {
match env::var("STYLO_THREADS").map(|s| s.parse::<usize>().expect("invalid STYLO_THREADS")) {
Ok(num) => num,
_ => cmp::max(num_cpus::get() * 3 / 4, 1),
}
};
}
impl PerDocumentStyleData {
/// Create a dummy `PerDocumentStyleData`.
pub fn new(pres_context: RawGeckoPresContextBorrowed) -> Self {
// FIXME(bholley): Real window size.
let window_size: TypedSize2D<f32, ViewportPx> = TypedSize2D::new(800.0, 600.0);
let default_computed_values = ComputedValues::default_values(pres_context);
// FIXME(bz): We're going to need to either update the computed values
// in the Stylist's Device or give the Stylist a new Device when our
// default_computed_values changes.
let device = Device::new(MediaType::Screen, window_size, &default_computed_values);
let (new_anims_sender, new_anims_receiver) = channel();
PerDocumentStyleData(AtomicRefCell::new(PerDocumentStyleDataImpl {
stylist: Arc::new(Stylist::new(device)),
stylesheets: vec![],
stylesheets_changed: true,
new_animations_sender: new_anims_sender,
new_animations_receiver: new_anims_receiver,
running_animations: Arc::new(RwLock::new(HashMap::new())),
expired_animations: Arc::new(RwLock::new(HashMap::new())),
work_queue: if *NUM_THREADS <= 1 {
None
} else {
let configuration =
rayon::Configuration::new().set_num_threads(*NUM_THREADS);
rayon::ThreadPool::new(configuration).ok()
},
num_threads: *NUM_THREADS,
default_computed_values: default_computed_values,
}))
}
/// Get an immutable reference to this style data.
pub fn borrow(&self) -> AtomicRef<PerDocumentStyleDataImpl> {
self.0.borrow()
}
/// Get an mutable reference to this style data.
pub fn borrow_mut(&self) -> AtomicRefMut<PerDocumentStyleDataImpl> {
self.0.borrow_mut()
}
}
impl PerDocumentStyleDataImpl {
/// Recreate the style data if the stylesheets have changed.
pub fn flush_stylesheets(&mut self) {
// The stylist wants to be flushed if either the stylesheets change or the
// device dimensions change. When we add support for media queries, we'll
// need to detect the latter case and trigger a flush as well.
if self.stylesheets_changed {
let _ = Arc::get_mut(&mut self.stylist).unwrap()
.update(&self.stylesheets, None, true);
self.stylesheets_changed = false;
}
}
}
unsafe impl HasFFI for PerDocumentStyleData {
type FFIType = RawServoStyleSet;
}
unsafe impl HasSimpleFFI for PerDocumentStyleData {}
unsafe impl HasBoxFFI for PerDocumentStyleData {}
impl Drop for PerDocumentStyleDataImpl {
fn drop(&mut self) {
let _ = self.work_queue.take();
}
}
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