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Pass TraversalFlags from C++ into Rust.

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MozReview-Commit-ID: EVUzgnL5coN
This commit is contained in:
Bobby Holley 2017-07-25 18:45:37 -07:00
parent c365a39104
commit ce295f6daf
9 changed files with 107 additions and 91 deletions
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3
components/layout_thread/lib.rs
View file

@ -135,7 +135,8 @@ use style::stylesheets::{Origin, Stylesheet, StylesheetInDocument, UserAgentStyl
use style::stylist::{ExtraStyleData, Stylist};
use style::thread_state;
use style::timer::Timer;
use style::traversal::{DomTraversal, TraversalDriver, TraversalFlags};
use style::traversal::{DomTraversal, TraversalDriver};
use style::traversal_flags::TraversalFlags;
/// Information needed by the layout thread.
pub struct LayoutThread {

3
components/style/context.rs
View file

@ -34,7 +34,8 @@ use stylist::Stylist;
use thread_state;
use time;
use timer::Timer;
use traversal::{DomTraversal, TraversalFlags};
use traversal::DomTraversal;
use traversal_flags::TraversalFlags;
pub use selectors::matching::QuirksMode;

2
components/style/dom.rs
View file

@ -33,7 +33,7 @@ use std::hash::Hash;
use std::ops::Deref;
use stylist::Stylist;
use thread_state;
use traversal::TraversalFlags;
use traversal_flags::TraversalFlags;
pub use style_traits::UnsafeNode;

2
components/style/invalidation/element/restyle_hints.rs
View file

@ -6,7 +6,7 @@
#[cfg(feature = "gecko")]
use gecko_bindings::structs::nsRestyleHint;
use traversal::TraversalFlags;
use traversal_flags::TraversalFlags;
bitflags! {
/// The kind of restyle we need to do for a given element.

1
components/style/lib.rs
View file

@ -135,6 +135,7 @@ pub mod stylesheets;
pub mod thread_state;
pub mod timer;
pub mod traversal;
pub mod traversal_flags;
#[macro_use]
#[allow(non_camel_case_types)]
pub mod values;

7
components/style/matching.rs
View file

@ -19,6 +19,7 @@ use rule_tree::{CascadeLevel, StrongRuleNode};
use selector_parser::{PseudoElement, RestyleDamage};
use selectors::matching::ElementSelectorFlags;
use servo_arc::{Arc, ArcBorrow};
use traversal_flags;
/// Represents the result of comparing an element's old and new style.
pub struct StyleDifference {
@ -172,7 +173,7 @@ trait PrivateMatchMethods: TElement {
// running or not.
// TODO: We should check which @keyframes changed/added/deleted
// and update only animations corresponding to those @keyframes.
(context.shared.traversal_flags.for_css_rule_changes() &&
(context.shared.traversal_flags.contains(traversal_flags::ForCSSRuleChanges) &&
has_new_animation_style) ||
!old_box_style.animations_equals(&new_box_style) ||
(old_display_style == display::T::none &&
@ -302,7 +303,7 @@ trait PrivateMatchMethods: TElement {
pseudo: Option<&PseudoElement>)
-> ChildCascadeRequirement {
// Don't accumulate damage if we're in a restyle for reconstruction.
if shared_context.traversal_flags.for_reconstruct() {
if shared_context.traversal_flags.contains(traversal_flags::ForReconstruct) {
return ChildCascadeRequirement::MustCascadeChildren;
}
@ -499,7 +500,7 @@ pub trait MatchMethods : TElement {
}
// Don't accumulate damage if we're in a restyle for reconstruction.
if context.shared.traversal_flags.for_reconstruct() {
if context.shared.traversal_flags.contains(traversal_flags::ForReconstruct) {
return ChildCascadeRequirement::MustCascadeChildren;
}

58
components/style/traversal.rs
View file

@ -13,6 +13,7 @@ use sharing::StyleSharingTarget;
use smallvec::SmallVec;
use style_resolver::StyleResolverForElement;
use stylist::RuleInclusion;
use traversal_flags::{TraversalFlags, self};
/// A per-traversal-level chunk of data. This is sent down by the traversal, and
/// currently only holds the dom depth for the bloom filter.
@ -27,45 +28,6 @@ pub struct PerLevelTraversalData {
pub current_dom_depth: usize,
}
bitflags! {
/// Flags that control the traversal process.
pub flags TraversalFlags: u8 {
/// Traverse only unstyled children.
const UNSTYLED_CHILDREN_ONLY = 0x01,
/// Traverse only elements for animation restyles.
const ANIMATION_ONLY = 0x02,
/// Traverse without generating any change hints.
const FOR_RECONSTRUCT = 0x04,
/// Traverse triggered by CSS rule changes.
///
/// Traverse and update all elements with CSS animations since
/// @keyframes rules may have changed
const FOR_CSS_RULE_CHANGES = 0x08,
}
}
impl TraversalFlags {
/// Returns true if the traversal is for animation-only restyles.
pub fn for_animation_only(&self) -> bool {
self.contains(ANIMATION_ONLY)
}
/// Returns true if the traversal is for unstyled children.
pub fn for_unstyled_children_only(&self) -> bool {
self.contains(UNSTYLED_CHILDREN_ONLY)
}
/// Returns true if the traversal is for a frame reconstruction.
pub fn for_reconstruct(&self) -> bool {
self.contains(FOR_RECONSTRUCT)
}
/// Returns true if the traversal is triggered by CSS rule changes.
pub fn for_css_rule_changes(&self) -> bool {
self.contains(FOR_CSS_RULE_CHANGES)
}
}
/// This structure exists to enforce that callers invoke pre_traverse, and also
/// to pass information from the pre-traversal into the primary traversal.
pub struct PreTraverseToken {
@ -208,12 +170,12 @@ pub trait DomTraversal<E: TElement> : Sync {
shared_context: &SharedStyleContext,
traversal_flags: TraversalFlags
) -> PreTraverseToken {
debug_assert!(!(traversal_flags.for_reconstruct() &&
traversal_flags.for_unstyled_children_only()),
debug_assert!(!(traversal_flags.contains(traversal_flags::ForReconstruct) &&
traversal_flags.contains(traversal_flags::UnstyledChildrenOnly)),
"must not specify FOR_RECONSTRUCT in combination with \
UNSTYLED_CHILDREN_ONLY");
if traversal_flags.for_unstyled_children_only() {
if traversal_flags.contains(traversal_flags::UnstyledChildrenOnly) {
if root.borrow_data().map_or(true, |d| d.has_styles() && d.styles.is_display_none()) {
return PreTraverseToken {
traverse: false,
@ -281,7 +243,7 @@ pub trait DomTraversal<E: TElement> : Sync {
return true;
}
if traversal_flags.for_reconstruct() {
if traversal_flags.contains(traversal_flags::ForReconstruct) {
return true;
}
@ -358,7 +320,7 @@ pub trait DomTraversal<E: TElement> : Sync {
//
// We also need to traverse nodes with explicit damage and no other
// restyle data, so that this damage can be cleared.
if (cfg!(feature = "servo") || traversal_flags.for_reconstruct()) &&
if (cfg!(feature = "servo") || traversal_flags.contains(traversal_flags::ForReconstruct)) &&
!data.restyle.damage.is_empty() {
return true;
}
@ -618,7 +580,7 @@ where
!propagated_hint.is_empty() ||
context.thread_local.is_initial_style() ||
data.restyle.reconstructed_self() ||
flags.for_reconstruct() ||
flags.contains(traversal_flags::ForReconstruct) ||
is_servo_nonincremental_layout();
traverse_children = traverse_children &&
@ -639,7 +601,7 @@ where
// If we are in a restyle for reconstruction, drop the existing restyle
// data here, since we won't need to perform a post-traversal to pick up
// any change hints.
if context.shared.traversal_flags.for_reconstruct() {
if context.shared.traversal_flags.contains(traversal_flags::ForReconstruct) {
data.clear_restyle_state();
}
@ -659,7 +621,7 @@ where
// The second case is when we are in a restyle for reconstruction, where we
// won't need to perform a post-traversal to pick up any change hints.
if data.styles.is_display_none() ||
context.shared.traversal_flags.for_reconstruct() {
context.shared.traversal_flags.contains(traversal_flags::ForReconstruct) {
unsafe { element.unset_dirty_descendants(); }
}
@ -822,7 +784,7 @@ where
// If we are in a restyle for reconstruction, there is no need to
// perform a post-traversal, so we don't need to set the dirty
// descendants bit on the parent.
if !flags.for_reconstruct() && !is_initial_style {
if !flags.contains(traversal_flags::ForReconstruct) && !is_initial_style {
if flags.for_animation_only() {
unsafe { element.set_animation_only_dirty_descendants(); }
} else {

64
components/style/traversal_flags.rs Normal file
View file

@ -0,0 +1,64 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Flags that control the traversal process.
//!
//! We CamelCase rather than UPPER_CASING so that we can grep for the same
//! strings across gecko and servo.
#![allow(non_upper_case_globals)]
bitflags! {
/// Flags that control the traversal process.
pub flags TraversalFlags: u32 {
/// Traverse only elements for animation restyles.
const AnimationOnly = 1 << 0,
/// Traverse and update all elements with CSS animations since
/// @keyframes rules may have changed. Triggered by CSS rule changes.
const ForCSSRuleChanges = 1 << 1,
/// Traverse only unstyled children of the root and their descendants.
const UnstyledChildrenOnly = 1 << 2,
/// FIXME(bholley): This will go away.
const ForReconstruct = 1 << 3,
/// FIXME(bholley): This will go away.
const ForNewlyBoundElement = 1 << 4,
/// FIXME(bholley): This will go away.
const ForThrottledAnimationFlush = 1 << 5,
}
}
/// Asserts that all TraversalFlags flags have a matching ServoTraversalFlags value in gecko.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_traversal_flags_match() {
use gecko_bindings::structs;
macro_rules! check_traversal_flags {
( $( $a:ident => $b:ident ),*, ) => {
if cfg!(debug_assertions) {
let mut modes = TraversalFlags::all();
$(
assert_eq!(structs::$a as usize, $b.bits() as usize, stringify!($b));
modes.remove($b);
)*
assert_eq!(modes, TraversalFlags::empty(), "all TraversalFlags bits should have an assertion");
}
}
}
check_traversal_flags! {
ServoTraversalFlags_AnimationOnly => AnimationOnly,
ServoTraversalFlags_ForCSSRuleChanges => ForCSSRuleChanges,
ServoTraversalFlags_UnstyledChildrenOnly => UnstyledChildrenOnly,
ServoTraversalFlags_ForReconstruct => ForReconstruct,
ServoTraversalFlags_ForNewlyBoundElement => ForNewlyBoundElement,
ServoTraversalFlags_ForThrottledAnimationFlush => ForThrottledAnimationFlush,
}
}
impl TraversalFlags {
/// Returns true if the traversal is for animation-only restyles.
pub fn for_animation_only(&self) -> bool {
self.contains(AnimationOnly)
}
}

58
ports/geckolib/glue.rs
View file

@ -77,6 +77,7 @@ use style::gecko_bindings::structs::MallocSizeOf;
use style::gecko_bindings::structs::RawGeckoGfxMatrix4x4;
use style::gecko_bindings::structs::RawGeckoPresContextOwned;
use style::gecko_bindings::structs::ServoElementSnapshotTable;
use style::gecko_bindings::structs::ServoTraversalFlags;
use style::gecko_bindings::structs::StyleRuleInclusion;
use style::gecko_bindings::structs::URLExtraData;
use style::gecko_bindings::structs::nsCSSValueSharedList;
@ -92,7 +93,7 @@ use style::gecko_properties::{self, style_structs};
use style::invalidation::element::restyle_hints::{self, RestyleHint};
use style::media_queries::{MediaList, parse_media_query_list};
use style::parallel;
use style::parser::ParserContext;
use style::parser::{ParserContext, self};
use style::properties::{ComputedValues, Importance};
use style::properties::{IS_FIELDSET_CONTENT, LonghandIdSet};
use style::properties::{PropertyDeclaration, PropertyDeclarationBlock, PropertyId, ShorthandId};
@ -116,9 +117,9 @@ use style::stylesheets::supports_rule::parse_condition_or_declaration;
use style::stylist::RuleInclusion;
use style::thread_state;
use style::timer::Timer;
use style::traversal::{ANIMATION_ONLY, DomTraversal, FOR_CSS_RULE_CHANGES, FOR_RECONSTRUCT};
use style::traversal::{TraversalDriver, TraversalFlags, UNSTYLED_CHILDREN_ONLY};
use style::traversal::{DomTraversal, TraversalDriver};
use style::traversal::resolve_style;
use style::traversal_flags::{TraversalFlags, self};
use style::values::{CustomIdent, KeyframesName};
use style::values::animated::ToAnimatedZero;
use style::values::computed::Context;
@ -140,8 +141,6 @@ static mut DUMMY_URL_DATA: *mut URLExtraData = 0 as *mut URLExtraData;
#[no_mangle]
pub extern "C" fn Servo_Initialize(dummy_url_data: *mut URLExtraData) {
use style::parser::assert_parsing_mode_match;
// Initialize logging.
let mut builder = LogBuilder::new();
let default_level = if cfg!(debug_assertions) { "warn" } else { "error" };
@ -155,7 +154,8 @@ pub extern "C" fn Servo_Initialize(dummy_url_data: *mut URLExtraData) {
// Perform some debug-only runtime assertions.
restyle_hints::assert_restyle_hints_match();
assert_parsing_mode_match();
parser::assert_parsing_mode_match();
traversal_flags::assert_traversal_flags_match();
// Initialize some static data.
gecko_properties::initialize();
@ -259,32 +259,16 @@ fn traverse_subtree(element: GeckoElement,
pub extern "C" fn Servo_TraverseSubtree(root: RawGeckoElementBorrowed,
raw_data: RawServoStyleSetBorrowed,
snapshots: *const ServoElementSnapshotTable,
root_behavior: structs::TraversalRootBehavior,
restyle_behavior: structs::TraversalRestyleBehavior)
raw_flags: ServoTraversalFlags)
-> bool {
use self::structs::TraversalRestyleBehavior as Restyle;
use self::structs::TraversalRootBehavior as Root;
let traversal_flags = TraversalFlags::from_bits_truncate(raw_flags);
debug_assert!(!snapshots.is_null());
let element = GeckoElement(root);
debug!("Servo_TraverseSubtree: {:?} {:?}", element, restyle_behavior);
let traversal_flags = match (root_behavior, restyle_behavior) {
(Root::Normal, Restyle::Normal) |
(Root::Normal, Restyle::ForNewlyBoundElement) |
(Root::Normal, Restyle::ForThrottledAnimationFlush)
=> TraversalFlags::empty(),
(Root::UnstyledChildrenOnly, Restyle::Normal) |
(Root::UnstyledChildrenOnly, Restyle::ForNewlyBoundElement)
=> UNSTYLED_CHILDREN_ONLY,
(Root::Normal, Restyle::ForCSSRuleChanges) => FOR_CSS_RULE_CHANGES,
(Root::Normal, Restyle::ForReconstruct) => FOR_RECONSTRUCT,
_ => panic!("invalid combination of TraversalRootBehavior and TraversalRestyleBehavior"),
};
// It makes no sense to do an animation restyle when we're restyling
// newly-inserted content.
if !traversal_flags.contains(UNSTYLED_CHILDREN_ONLY) {
if !traversal_flags.contains(traversal_flags::UnstyledChildrenOnly) {
let needs_animation_only_restyle =
element.has_animation_only_dirty_descendants() ||
element.has_animation_restyle_hints();
@ -292,12 +276,12 @@ pub extern "C" fn Servo_TraverseSubtree(root: RawGeckoElementBorrowed,
if needs_animation_only_restyle {
traverse_subtree(element,
raw_data,
traversal_flags | ANIMATION_ONLY,
traversal_flags | traversal_flags::AnimationOnly,
unsafe { &*snapshots });
}
}
if restyle_behavior == Restyle::ForThrottledAnimationFlush {
if traversal_flags.contains(traversal_flags::ForThrottledAnimationFlush) {
return element.has_animation_only_dirty_descendants() ||
element.borrow_data().unwrap().restyle.is_restyle();
}
@ -307,7 +291,7 @@ pub extern "C" fn Servo_TraverseSubtree(root: RawGeckoElementBorrowed,
traversal_flags,
unsafe { &*snapshots });
if restyle_behavior == Restyle::ForNewlyBoundElement {
if traversal_flags.contains(traversal_flags::ForNewlyBoundElement) {
// In this mode, we only ever restyle new elements, so there is no
// need for a post-traversal, and the borrow_data().unwrap() call below
// could panic, so we don't bother computing whether a post-traversal
@ -2767,9 +2751,10 @@ pub extern "C" fn Servo_NoteExplicitHints(element: RawGeckoElementBorrowed,
#[no_mangle]
pub extern "C" fn Servo_TakeChangeHint(element: RawGeckoElementBorrowed,
restyle_behavior: structs::TraversalRestyleBehavior,
raw_flags: ServoTraversalFlags,
was_restyled: *mut bool) -> nsChangeHint
{
let flags = TraversalFlags::from_bits_truncate(raw_flags);
let mut was_restyled = unsafe { was_restyled.as_mut().unwrap() };
let element = GeckoElement(element);
@ -2778,7 +2763,7 @@ pub extern "C" fn Servo_TakeChangeHint(element: RawGeckoElementBorrowed,
*was_restyled = data.restyle.is_restyle();
let damage = data.restyle.damage;
if restyle_behavior == structs::TraversalRestyleBehavior::ForThrottledAnimationFlush {
if flags.contains(traversal_flags::ForThrottledAnimationFlush) {
if !*was_restyled {
// Don't touch elements if the element was not restyled
// in throttled animation flush.
@ -2813,11 +2798,10 @@ pub extern "C" fn Servo_TakeChangeHint(element: RawGeckoElementBorrowed,
#[no_mangle]
pub extern "C" fn Servo_ResolveStyle(element: RawGeckoElementBorrowed,
_raw_data: RawServoStyleSetBorrowed,
restyle_behavior: structs::TraversalRestyleBehavior)
raw_flags: ServoTraversalFlags)
-> ServoStyleContextStrong
{
use self::structs::TraversalRestyleBehavior as Restyle;
let flags = TraversalFlags::from_bits_truncate(raw_flags);
let element = GeckoElement(element);
debug!("Servo_ResolveStyle: {:?}", element);
let data =
@ -2827,12 +2811,14 @@ pub extern "C" fn Servo_ResolveStyle(element: RawGeckoElementBorrowed,
assert!(data.has_styles(), "Resolving style on unstyled element");
// In the case where we process for throttled animation, there remaings
// restyle hints other than animation hints.
let flags = if restyle_behavior == Restyle::ForThrottledAnimationFlush {
ANIMATION_ONLY
//
// FIXME(bholley): Unify these flags.
let assert_flags = if flags.contains(traversal_flags::ForThrottledAnimationFlush) {
traversal_flags::AnimationOnly
} else {
TraversalFlags::empty()
};
debug_assert!(element.has_current_styles_for_traversal(&*data, flags),
debug_assert!(element.has_current_styles_for_traversal(&*data, assert_flags),
"Resolving style on {:?} without current styles: {:?}", element, data);
data.styles.primary().clone().into()
}