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Bug 1317016 - Basic infrastructure for RestyleHint-driven traversal.

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MozReview-Commit-ID: 7wH5XcILVmX
This commit is contained in:
Bobby Holley 2016-11-01 23:11:24 -07:00
parent e1eff691f8
commit 992f7dddf4
35 changed files with 1465 additions and 901 deletions
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19
components/style/restyle_hints.rs
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@ -6,6 +6,8 @@
use Atom;
use element_state::*;
#[cfg(feature = "gecko")]
use gecko_bindings::structs::nsRestyleHint;
#[cfg(feature = "servo")]
use heapsize::HeapSizeOf;
use selector_parser::{AttrValue, ElementExt, NonTSPseudoClass, Snapshot, SelectorImpl};
@ -23,7 +25,7 @@ use std::sync::Arc;
/// attribute selectors. Doing this conservatively is expensive, and so we use
/// RestyleHints to short-circuit work we know is unnecessary.
bitflags! {
pub flags RestyleHint: u8 {
pub flags RestyleHint: u32 {
#[doc = "Rerun selector matching on the element."]
const RESTYLE_SELF = 0x01,
#[doc = "Rerun selector matching on all of the element's descendants."]
@ -35,6 +37,21 @@ bitflags! {
}
}
#[cfg(feature = "gecko")]
impl From<nsRestyleHint> for RestyleHint {
fn from(raw: nsRestyleHint) -> Self {
use std::mem;
let raw_bits: u32 = unsafe { mem::transmute(raw) };
// FIXME(bholley): Finish aligning the binary representations here and
// then .expect() the result of the checked version.
if Self::from_bits(raw_bits).is_none() {
error!("stylo: dropping unsupported restyle hint bits");
}
Self::from_bits_truncate(raw_bits)
}
}
#[cfg(feature = "servo")]
impl HeapSizeOf for RestyleHint {
fn heap_size_of_children(&self) -> usize { 0 }