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/* 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/. */
//! Data needed to style a Gecko document.
use crate::dom::TElement;
use crate::gecko_bindings::bindings;
use crate::gecko_bindings::structs::{
self, ServoStyleSetSizes, StyleSheet as DomStyleSheet, StyleSheetInfo,
};
use crate::invalidation::media_queries::{MediaListKey, ToMediaListKey};
use crate::media_queries::{Device, MediaList};
use crate::properties::ComputedValues;
use crate::selector_parser::SnapshotMap;
use crate::shared_lock::{SharedRwLockReadGuard, StylesheetGuards};
use crate::stylesheets::{StylesheetContents, StylesheetInDocument};
use crate::stylist::Stylist;
use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
use malloc_size_of::MallocSizeOfOps;
use servo_arc::Arc;
use std::fmt;
/// Little wrapper to a Gecko style sheet.
#[derive(Eq, PartialEq)]
pub struct GeckoStyleSheet(*const DomStyleSheet);
// NOTE(emilio): These are kind of a lie. We allow to make these Send + Sync so that other data
// structures can also be Send and Sync, but Gecko's stylesheets are main-thread-reference-counted.
//
// We assert that we reference-count in the right thread (in the Addref/Release implementations).
// Sending these to a different thread can't really happen (it could theoretically really happen if
// we allowed @import rules inside a nested style rule, but that can't happen per spec and would be
// a parser bug, caught by the asserts).
unsafe impl Send for GeckoStyleSheet {}
unsafe impl Sync for GeckoStyleSheet {}
impl fmt::Debug for GeckoStyleSheet {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
let contents = self.contents();
formatter
.debug_struct("GeckoStyleSheet")
.field("origin", &contents.origin)
.field("url_data", &*contents.url_data.read())
.finish()
}
}
impl ToMediaListKey for crate::gecko::data::GeckoStyleSheet {
fn to_media_list_key(&self) -> MediaListKey {
use std::mem;
unsafe { MediaListKey::from_raw(mem::transmute(self.0)) }
}
}
impl GeckoStyleSheet {
/// Create a `GeckoStyleSheet` from a raw `DomStyleSheet` pointer.
#[inline]
pub unsafe fn new(s: *const DomStyleSheet) -> Self {
debug_assert!(!s.is_null());
bindings::Gecko_StyleSheet_AddRef(s);
Self::from_addrefed(s)
}
/// Create a `GeckoStyleSheet` from a raw `DomStyleSheet` pointer that
/// already holds a strong reference.
#[inline]
pub unsafe fn from_addrefed(s: *const DomStyleSheet) -> Self {
assert!(!s.is_null());
GeckoStyleSheet(s)
}
/// HACK(emilio): This is so that we can avoid crashing release due to
/// bug 1719963 and can hopefully get a useful report from fuzzers.
#[inline]
pub fn hack_is_null(&self) -> bool {
self.0.is_null()
}
/// Get the raw `StyleSheet` that we're wrapping.
pub fn raw(&self) -> &DomStyleSheet {
unsafe { &*self.0 }
}
fn inner(&self) -> &StyleSheetInfo {
unsafe { &*(self.raw().mInner as *const StyleSheetInfo) }
}
}
impl Drop for GeckoStyleSheet {
fn drop(&mut self) {
unsafe { bindings::Gecko_StyleSheet_Release(self.0) };
}
}
impl Clone for GeckoStyleSheet {
fn clone(&self) -> Self {
unsafe { bindings::Gecko_StyleSheet_AddRef(self.0) };
GeckoStyleSheet(self.0)
}
}
impl StylesheetInDocument for GeckoStyleSheet {
fn media<'a>(&'a self, guard: &'a SharedRwLockReadGuard) -> Option<&'a MediaList> {
use crate::gecko_bindings::structs::mozilla::dom::MediaList as DomMediaList;
unsafe {
let dom_media_list = self.raw().mMedia.mRawPtr as *const DomMediaList;
if dom_media_list.is_null() {
return None;
}
let list = &*(*dom_media_list).mRawList.mRawPtr;
Some(list.read_with(guard))
}
}
// All the stylesheets Servo knows about are enabled, because that state is
// handled externally by Gecko.
#[inline]
fn enabled(&self) -> bool {
true
}
#[inline]
fn contents(&self) -> &StylesheetContents {
debug_assert!(!self.inner().mContents.mRawPtr.is_null());
unsafe { &*self.inner().mContents.mRawPtr }
}
}
/// The container for data that a Servo-backed Gecko document needs to style
/// itself.
pub struct PerDocumentStyleDataImpl {
/// Rule processor.
pub stylist: Stylist,
/// A cache from element to resolved style.
pub undisplayed_style_cache: crate::traversal::UndisplayedStyleCache,
/// The generation for which our cache is valid.
pub undisplayed_style_cache_generation: u64,
}
/// The data itself is an `AtomicRefCell`, which guarantees the proper semantics
/// and unexpected races while trying to mutate it.
pub struct PerDocumentStyleData(AtomicRefCell<PerDocumentStyleDataImpl>);
impl PerDocumentStyleData {
/// Create a `PerDocumentStyleData`.
pub fn new(document: *const structs::Document) -> Self {
let device = Device::new(document);
let quirks_mode = device.document().mCompatMode;
PerDocumentStyleData(AtomicRefCell::new(PerDocumentStyleDataImpl {
stylist: Stylist::new(device, quirks_mode.into()),
undisplayed_style_cache: Default::default(),
undisplayed_style_cache_generation: 0,
}))
}
/// Get an immutable reference to this style data.
pub fn borrow(&self) -> AtomicRef<PerDocumentStyleDataImpl> {
self.0.borrow()
}
/// Get an mutable reference to this style data.
pub fn borrow_mut(&self) -> AtomicRefMut<PerDocumentStyleDataImpl> {
self.0.borrow_mut()
}
}
impl PerDocumentStyleDataImpl {
/// Recreate the style data if the stylesheets have changed.
pub fn flush_stylesheets<E>(
&mut self,
guard: &SharedRwLockReadGuard,
document_element: Option<E>,
snapshots: Option<&SnapshotMap>,
) -> bool
where
E: TElement,
{
self.stylist
.flush(&StylesheetGuards::same(guard), document_element, snapshots)
}
/// Get the default computed values for this document.
pub fn default_computed_values(&self) -> &Arc<ComputedValues> {
self.stylist.device().default_computed_values_arc()
}
/// Measure heap usage.
pub fn add_size_of(&self, ops: &mut MallocSizeOfOps, sizes: &mut ServoStyleSetSizes) {
self.stylist.add_size_of(ops, sizes);
}
}
/// The gecko-specific AuthorStyles instantiation.
pub type AuthorStyles = crate::author_styles::AuthorStyles<GeckoStyleSheet>;
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