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80460cc549
The primary idea of this patch is to ditch the rigid enum of Previous/Current styles, and replace it with a series of indicators for the various types of work that needs to be performed (expanding snapshots, rematching, recascading, and damage processing). This loses us a little bit of sanity checking (since the up-to-date-ness of our style is no longer baked into the type system), but gives us a lot more flexibility that we'll need going forward (especially when we separate matching from cascading). We also eliminate get_styling_mode in favor of a method on the traversal. This patch does a few other things as ridealongs: * Temporarily eliminates the handling for transfering ownership of styles to the frame. We'll need this again at some point, but for now it's causing too much complexity for a half-implemented feature. * Ditches TRestyleDamage, which is no longer necessary post-crate-merge, and is a constant source of compilation failures from either needing to be imported or being unnecessarily imported (which varies between gecko and servo). * Expands Snapshots for the traversal root, which was missing before. * Fixes up the skip_root stuff to avoid visiting the skipped root. * Unifies parallel traversal and avoids spawning for a single work item. * Adds an explicit pre_traverse step do any pre-processing and determine whether we need to traverse at all. MozReview-Commit-ID: IKhLAkAigXE
96 lines
3.1 KiB
Rust
96 lines
3.1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! The context within which style is calculated.
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use animation::Animation;
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use app_units::Au;
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use dom::OpaqueNode;
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use error_reporting::ParseErrorReporter;
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use euclid::Size2D;
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use matching::StyleSharingCandidateCache;
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use parking_lot::RwLock;
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use std::cell::RefCell;
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use std::collections::HashMap;
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use std::sync::{Arc, Mutex};
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use std::sync::mpsc::Sender;
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use stylist::Stylist;
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use timer::Timer;
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/// This structure is used to create a local style context from a shared one.
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pub struct LocalStyleContextCreationInfo {
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new_animations_sender: Sender<Animation>,
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}
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impl LocalStyleContextCreationInfo {
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pub fn new(animations_sender: Sender<Animation>) -> Self {
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LocalStyleContextCreationInfo {
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new_animations_sender: animations_sender,
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}
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}
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}
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pub struct SharedStyleContext {
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/// The current viewport size.
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pub viewport_size: Size2D<Au>,
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/// Screen sized changed?
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pub screen_size_changed: bool,
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/// The CSS selector stylist.
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pub stylist: Arc<Stylist>,
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/// Starts at zero, and increased by one every time a layout completes.
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/// This can be used to easily check for invalid stale data.
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pub generation: u32,
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/// Why is this reflow occurring
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pub goal: ReflowGoal,
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/// The animations that are currently running.
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pub running_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
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/// The list of animations that have expired since the last style recalculation.
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pub expired_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
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///The CSS error reporter for all CSS loaded in this layout thread
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pub error_reporter: Box<ParseErrorReporter + Sync>,
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/// Data needed to create the local style context from the shared one.
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pub local_context_creation_data: Mutex<LocalStyleContextCreationInfo>,
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/// The current timer for transitions and animations. This is needed to test
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/// them.
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pub timer: Timer,
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}
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pub struct LocalStyleContext {
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pub style_sharing_candidate_cache: RefCell<StyleSharingCandidateCache>,
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/// A channel on which new animations that have been triggered by style
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/// recalculation can be sent.
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pub new_animations_sender: Sender<Animation>,
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}
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impl LocalStyleContext {
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pub fn new(local_context_creation_data: &LocalStyleContextCreationInfo) -> Self {
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LocalStyleContext {
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style_sharing_candidate_cache: RefCell::new(StyleSharingCandidateCache::new()),
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new_animations_sender: local_context_creation_data.new_animations_sender.clone(),
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}
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}
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}
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pub trait StyleContext<'a> {
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fn shared_context(&self) -> &'a SharedStyleContext;
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fn local_context(&self) -> &LocalStyleContext;
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}
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/// Why we're doing reflow.
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#[derive(PartialEq, Copy, Clone, Debug)]
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pub enum ReflowGoal {
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/// We're reflowing in order to send a display list to the screen.
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ForDisplay,
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/// We're reflowing in order to satisfy a script query. No display list will be created.
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ForScriptQuery,
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}
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