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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
56 lines
2 KiB
Rust
56 lines
2 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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use atomic_refcell::AtomicRefCell;
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use context::{LocalStyleContext, SharedStyleContext, StyleContext};
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use data::ElementData;
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use dom::{NodeInfo, OpaqueNode, TNode};
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use gecko::context::StandaloneStyleContext;
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use gecko::wrapper::{GeckoElement, GeckoNode};
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use std::mem;
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use traversal::{DomTraversalContext, PerLevelTraversalData, recalc_style_at};
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pub struct RecalcStyleOnly<'lc> {
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context: StandaloneStyleContext<'lc>,
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}
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impl<'lc, 'ln> DomTraversalContext<GeckoNode<'ln>> for RecalcStyleOnly<'lc> {
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type SharedContext = SharedStyleContext;
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#[allow(unsafe_code)]
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fn new<'a>(shared: &'a Self::SharedContext, _root: OpaqueNode) -> Self {
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// See the comment in RecalcStyleAndConstructFlows::new for an explanation of why this is
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// necessary.
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let shared_lc: &'lc Self::SharedContext = unsafe { mem::transmute(shared) };
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RecalcStyleOnly {
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context: StandaloneStyleContext::new(shared_lc),
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}
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}
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fn process_preorder(&self, node: GeckoNode<'ln>, traversal_data: &mut PerLevelTraversalData) {
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if node.is_element() {
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let el = node.as_element().unwrap();
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let mut data = unsafe { el.ensure_data() }.borrow_mut();
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recalc_style_at::<_, _, Self>(&self.context, traversal_data, el, &mut data);
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}
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}
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fn process_postorder(&self, _: GeckoNode<'ln>) {
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unreachable!();
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}
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/// We don't use the post-order traversal for anything.
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fn needs_postorder_traversal() -> bool { false }
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unsafe fn ensure_element_data<'a>(element: &'a GeckoElement<'ln>) -> &'a AtomicRefCell<ElementData> {
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element.ensure_data()
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}
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unsafe fn clear_element_data<'a>(element: &'a GeckoElement<'ln>) {
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element.clear_data()
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}
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fn local_context(&self) -> &LocalStyleContext {
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self.context.local_context()
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}
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}
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