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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
53 lines
1.7 KiB
Rust
53 lines
1.7 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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//! Implements sequential traversal over the DOM tree.
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use dom::{TElement, TNode};
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use traversal::{DomTraversalContext, PerLevelTraversalData, PreTraverseToken};
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pub fn traverse_dom<N, C>(root: N::ConcreteElement,
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shared: &C::SharedContext,
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token: PreTraverseToken)
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where N: TNode,
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C: DomTraversalContext<N>
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{
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debug_assert!(token.should_traverse());
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fn doit<'a, N, C>(context: &'a C, node: N, data: &mut PerLevelTraversalData)
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where N: TNode,
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C: DomTraversalContext<N>
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{
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context.process_preorder(node, data);
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if let Some(el) = node.as_element() {
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if let Some(ref mut depth) = data.current_dom_depth {
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*depth += 1;
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}
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C::traverse_children(el, |kid| doit::<N, C>(context, kid, data));
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if let Some(ref mut depth) = data.current_dom_depth {
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*depth -= 1;
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}
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}
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if C::needs_postorder_traversal() {
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context.process_postorder(node);
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}
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}
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let mut data = PerLevelTraversalData {
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current_dom_depth: None,
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};
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let context = C::new(shared, root.as_node().opaque());
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if token.should_skip_root() {
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C::traverse_children(root, |kid| doit::<N, C>(&context, kid, &mut data));
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} else {
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doit::<N, C>(&context, root.as_node(), &mut data);
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}
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// Clear the local LRU cache since we store stateful elements inside.
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context.local_context().style_sharing_candidate_cache.borrow_mut().clear();
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}
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