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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /servo/components/style/invalidation/media_queries.rs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style/invalidation/media_queries.rs')
-rw-r--r-- | servo/components/style/invalidation/media_queries.rs | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/servo/components/style/invalidation/media_queries.rs b/servo/components/style/invalidation/media_queries.rs new file mode 100644 index 0000000000..6928b29d3d --- /dev/null +++ b/servo/components/style/invalidation/media_queries.rs @@ -0,0 +1,130 @@ +/* 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 https://mozilla.org/MPL/2.0/. */ + +//! Code related to the invalidation of media-query-affected rules. + +use crate::context::QuirksMode; +use crate::media_queries::Device; +use crate::shared_lock::SharedRwLockReadGuard; +use crate::stylesheets::{DocumentRule, ImportRule, MediaRule}; +use crate::stylesheets::{NestedRuleIterationCondition, StylesheetContents, SupportsRule}; +use fxhash::FxHashSet; + +/// A key for a given media query result. +/// +/// NOTE: It happens to be the case that all the media lists we care about +/// happen to have a stable address, so we can just use an opaque pointer to +/// represent them. +/// +/// Also, note that right now when a rule or stylesheet is removed, we do a full +/// style flush, so there's no need to worry about other item created with the +/// same pointer address. +/// +/// If this changes, though, we may need to remove the item from the cache if +/// present before it goes away. +#[derive(Clone, Copy, Debug, Eq, Hash, MallocSizeOf, PartialEq)] +pub struct MediaListKey(usize); + +impl MediaListKey { + /// Create a MediaListKey from a raw usize. + pub fn from_raw(k: usize) -> Self { + MediaListKey(k) + } +} + +/// A trait to get a given `MediaListKey` for a given item that can hold a +/// `MediaList`. +pub trait ToMediaListKey: Sized { + /// Get a `MediaListKey` for this item. This key needs to uniquely identify + /// the item. + fn to_media_list_key(&self) -> MediaListKey { + MediaListKey(self as *const Self as usize) + } +} + +impl ToMediaListKey for StylesheetContents {} +impl ToMediaListKey for ImportRule {} +impl ToMediaListKey for MediaRule {} + +/// A struct that holds the result of a media query evaluation pass for the +/// media queries that evaluated successfully. +#[derive(Clone, Debug, MallocSizeOf, PartialEq)] +pub struct EffectiveMediaQueryResults { + /// The set of media lists that matched last time. + set: FxHashSet<MediaListKey>, +} + +impl EffectiveMediaQueryResults { + /// Trivially constructs an empty `EffectiveMediaQueryResults`. + pub fn new() -> Self { + Self { + set: FxHashSet::default(), + } + } + + /// Resets the results, using an empty key. + pub fn clear(&mut self) { + self.set.clear() + } + + /// Returns whether a given item was known to be effective when the results + /// were cached. + pub fn was_effective<T>(&self, item: &T) -> bool + where + T: ToMediaListKey, + { + self.set.contains(&item.to_media_list_key()) + } + + /// Notices that an effective item has been seen, and caches it as matching. + pub fn saw_effective<T>(&mut self, item: &T) + where + T: ToMediaListKey, + { + // NOTE(emilio): We can't assert that we don't cache the same item twice + // because of stylesheet reusing... shrug. + self.set.insert(item.to_media_list_key()); + } +} + +/// A filter that filters over effective rules, but allowing all potentially +/// effective `@media` rules. +pub struct PotentiallyEffectiveMediaRules; + +impl NestedRuleIterationCondition for PotentiallyEffectiveMediaRules { + fn process_import( + _: &SharedRwLockReadGuard, + _: &Device, + _: QuirksMode, + _: &ImportRule, + ) -> bool { + true + } + + fn process_media(_: &SharedRwLockReadGuard, _: &Device, _: QuirksMode, _: &MediaRule) -> bool { + true + } + + /// Whether we should process the nested rules in a given `@-moz-document` rule. + fn process_document( + guard: &SharedRwLockReadGuard, + device: &Device, + quirks_mode: QuirksMode, + rule: &DocumentRule, + ) -> bool { + use crate::stylesheets::EffectiveRules; + EffectiveRules::process_document(guard, device, quirks_mode, rule) + } + + /// Whether we should process the nested rules in a given `@supports` rule. + fn process_supports( + guard: &SharedRwLockReadGuard, + device: &Device, + quirks_mode: QuirksMode, + rule: &SupportsRule, + ) -> bool { + use crate::stylesheets::EffectiveRules; + EffectiveRules::process_supports(guard, device, quirks_mode, rule) + } +} |