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Eliminate RestyleResult.

Browse source 
The new incremental restyle algorithm will make traversal decisions in a more
centralized way.

MozReview-Commit-ID: GH6gFt4VUJO
This commit is contained in:
Bobby Holley 2016-10-28 15:18:03 -07:00
parent 71b9004d86
commit 1a5e2b4673
7 changed files with 52 additions and 63 deletions
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27
components/style/traversal.rs
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@ -21,16 +21,6 @@ use util::opts;
/// detected by ticking a generation number every layout.
pub type Generation = u32;
/// This enum tells us about whether we can stop restyling or not after styling
/// an element.
///
/// So far this only happens where a display: none node is found.
#[derive(Clone, Copy, PartialEq)]
pub enum RestyleResult {
Continue,
Stop,
}
/// Style sharing candidate cache stats. These are only used when
/// `-Z style-sharing-stats` is given.
pub static STYLE_SHARING_CACHE_HITS: AtomicUsize = ATOMIC_USIZE_INIT;
@ -175,7 +165,7 @@ pub trait DomTraversalContext<N: TNode> {
fn new<'a>(&'a Self::SharedContext, OpaqueNode) -> Self;
/// Process `node` on the way down, before its children have been processed.
fn process_preorder(&self, node: N) -> RestyleResult;
fn process_preorder(&self, node: N);
/// Process `node` on the way up, after its children have been processed.
///
@ -307,7 +297,7 @@ fn ensure_element_styled_internal<'a, E, C>(element: E,
#[allow(unsafe_code)]
pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
root: OpaqueNode,
element: E) -> RestyleResult
element: E)
where E: TElement,
C: StyleContext<'a>,
D: DomTraversalContext<E::ConcreteNode>
@ -315,7 +305,6 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// Get the style bloom filter.
let mut bf = take_thread_local_bloom_filter(element.parent_element(), root, context.shared_context());
let mut restyle_result = RestyleResult::Continue;
let mode = element.styling_mode();
debug_assert!(mode != StylingMode::Stop, "Parent should not have enqueued us");
if mode != StylingMode::Traverse {
@ -361,9 +350,8 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// Perform the CSS cascade.
unsafe {
restyle_result = element.cascade_node(context, data,
element.parent_element(),
&applicable_declarations);
element.cascade_node(context, data, element.parent_element(),
&applicable_declarations);
}
// Add ourselves to the LRU cache.
@ -376,8 +364,7 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
relations);
}
}
StyleSharingResult::StyleWasShared(index, damage, cached_restyle_result) => {
restyle_result = cached_restyle_result;
StyleSharingResult::StyleWasShared(index, damage) => {
if opts::get().style_sharing_stats {
STYLE_SHARING_CACHE_HITS.fetch_add(1, Ordering::Relaxed);
}
@ -394,7 +381,7 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// If we restyled this node, conservatively mark all our children as needing
// processing. The eventual algorithm we're designing does this in a more granular
// fashion.
if mode == StylingMode::Restyle && restyle_result == RestyleResult::Continue {
if mode == StylingMode::Restyle && !element.is_display_none() {
for kid in element.as_node().children() {
if let Some(kid) = kid.as_element() {
unsafe { let _ = D::prepare_for_styling(&kid); }
@ -411,6 +398,4 @@ pub fn recalc_style_at<'a, E, C, D>(context: &'a C,
// NB: flow construction updates the bloom filter on the way up.
put_thread_local_bloom_filter(bf, &unsafe_layout_node, context.shared_context());
restyle_result
}