Record effective @font-face rules when updating stylist.

components/layout_thread/lib.rs

@@ -98,6 +98,7 @@ use servo_url::ServoUrl;
 use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::hash::BuildHasherDefault;
+use std::marker::PhantomData;
 use std::mem as std_mem;
 use std::ops::{Deref, DerefMut};
 use std::process;
@@ -116,7 +117,7 @@ use style::parser::ParserContextExtraData;
 use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, REPOSITION, STORE_OVERFLOW};
 use style::shared_lock::{SharedRwLock, SharedRwLockReadGuard, StylesheetGuards};
 use style::stylesheets::{Origin, Stylesheet, UserAgentStylesheets};
-use style::stylist::Stylist;
+use style::stylist::{ExtraStyleData, Stylist};
 use style::thread_state;
 use style::timer::Timer;
 use style::traversal::{DomTraversal, TraversalDriver, TraversalFlags};
@@ -1078,11 +1079,15 @@ impl LayoutThread {
             author: &author_guard,
             ua_or_user: &ua_or_user_guard,
         };
+        let mut extra_data = ExtraStyleData {
+            marker: PhantomData,
+        };
         let needs_dirtying = Arc::get_mut(&mut rw_data.stylist).unwrap().update(
             &data.document_stylesheets,
             &guards,
             Some(ua_stylesheets),
-            data.stylesheets_changed);
+            data.stylesheets_changed,
+            &mut extra_data);
         let needs_reflow = viewport_size_changed && !needs_dirtying;
         if needs_dirtying {
             if let Some(mut d) = element.mutate_data() {

components/style/gecko/data.rs

@@ -13,12 +13,12 @@ use gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
 use media_queries::Device;
 use parking_lot::RwLock;
 use properties::ComputedValues;
-use shared_lock::{StylesheetGuards, SharedRwLockReadGuard};
+use shared_lock::{Locked, StylesheetGuards, SharedRwLockReadGuard};
 use std::collections::HashMap;
 use std::sync::Arc;
 use std::sync::mpsc::{Receiver, Sender, channel};
-use stylesheets::Stylesheet;
-use stylist::Stylist;
+use stylesheets::{FontFaceRule, Origin, Stylesheet};
+use stylist::{ExtraStyleData, Stylist};
 
 /// The container for data that a Servo-backed Gecko document needs to style
 /// itself.
@@ -45,6 +45,9 @@ pub struct PerDocumentStyleDataImpl {
     /// Unused. Will go away when we actually implement transitions and
     /// animations properly.
     pub expired_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
+
+    /// List of effective font face rules.
+    pub font_faces: Vec<(Arc<Locked<FontFaceRule>>, Origin)>,
 }
 
 /// The data itself is an `AtomicRefCell`, which guarantees the proper semantics
@@ -66,6 +69,7 @@ impl PerDocumentStyleData {
             new_animations_receiver: new_anims_receiver,
             running_animations: Arc::new(RwLock::new(HashMap::new())),
             expired_animations: Arc::new(RwLock::new(HashMap::new())),
+            font_faces: vec![],
         }))
     }
 
@@ -97,7 +101,11 @@ impl PerDocumentStyleDataImpl {
     pub fn flush_stylesheets(&mut self, guard: &SharedRwLockReadGuard) {
         if self.stylesheets_changed {
             let mut stylist = Arc::get_mut(&mut self.stylist).unwrap();
-            stylist.update(&self.stylesheets, &StylesheetGuards::same(guard), None, true);
+            let mut extra_data = ExtraStyleData {
+                font_faces: &mut self.font_faces,
+            };
+            stylist.update(&self.stylesheets, &StylesheetGuards::same(guard),
+                           None, true, &mut extra_data);
             self.stylesheets_changed = false;
         }
     }

components/style/stylist.rs

@@ -34,9 +34,11 @@ use std::borrow::Borrow;
 use std::collections::HashMap;
 use std::fmt;
 use std::hash::Hash;
+#[cfg(feature = "servo")]
+use std::marker::PhantomData;
 use std::sync::Arc;
 use style_traits::viewport::ViewportConstraints;
-use stylesheets::{CssRule, Origin, StyleRule, Stylesheet, UserAgentStylesheets};
+use stylesheets::{CssRule, FontFaceRule, Origin, StyleRule, Stylesheet, UserAgentStylesheets};
 use thread_state;
 use viewport::{self, MaybeNew, ViewportRule};
 
@@ -118,6 +120,37 @@ pub struct Stylist {
     non_common_style_affecting_attributes_selectors: Vec<Selector<SelectorImpl>>,
 }
 
+/// This struct holds data which user of Stylist may want to extract
+/// from stylesheets which can be done at the same time as updating.
+pub struct ExtraStyleData<'a> {
+    /// A list of effective font-face rules and their origin.
+    #[cfg(feature = "gecko")]
+    pub font_faces: &'a mut Vec<(Arc<Locked<FontFaceRule>>, Origin)>,
+
+    #[allow(missing_docs)]
+    #[cfg(feature = "servo")]
+    pub marker: PhantomData<&'a usize>,
+}
+
+#[cfg(feature = "gecko")]
+impl<'a> ExtraStyleData<'a> {
+    /// Clear the internal @font-face rule list.
+    fn clear_font_faces(&mut self) {
+        self.font_faces.clear();
+    }
+
+    /// Add the given @font-face rule.
+    fn add_font_face(&mut self, rule: &Arc<Locked<FontFaceRule>>, origin: Origin) {
+        self.font_faces.push((rule.clone(), origin));
+    }
+}
+
+#[cfg(feature = "servo")]
+impl<'a> ExtraStyleData<'a> {
+    fn clear_font_faces(&mut self) {}
+    fn add_font_face(&mut self, _: &Arc<Locked<FontFaceRule>>, _: Origin) {}
+}
+
 impl Stylist {
     /// Construct a new `Stylist`, using a given `Device`.
     #[inline]
@@ -156,11 +189,12 @@ impl Stylist {
     /// This method resets all the style data each time the stylesheets change
     /// (which is indicated by the `stylesheets_changed` parameter), or the
     /// device is dirty, which means we need to re-evaluate media queries.
-    pub fn update(&mut self,
-                  doc_stylesheets: &[Arc<Stylesheet>],
-                  guards: &StylesheetGuards,
-                  ua_stylesheets: Option<&UserAgentStylesheets>,
-                  stylesheets_changed: bool) -> bool {
+    pub fn update<'a>(&mut self,
+                      doc_stylesheets: &[Arc<Stylesheet>],
+                      guards: &StylesheetGuards,
+                      ua_stylesheets: Option<&UserAgentStylesheets>,
+                      stylesheets_changed: bool,
+                      extra_data: &mut ExtraStyleData<'a>) -> bool {
         if !(self.is_device_dirty || stylesheets_changed) {
             return false;
         }
@@ -194,18 +228,21 @@ impl Stylist {
         self.sibling_affecting_selectors.clear();
         self.non_common_style_affecting_attributes_selectors.clear();
 
+        extra_data.clear_font_faces();
+
         if let Some(ua_stylesheets) = ua_stylesheets {
             for stylesheet in &ua_stylesheets.user_or_user_agent_stylesheets {
-                self.add_stylesheet(&stylesheet, guards.ua_or_user);
+                self.add_stylesheet(&stylesheet, guards.ua_or_user, extra_data);
             }
 
             if self.quirks_mode {
-                self.add_stylesheet(&ua_stylesheets.quirks_mode_stylesheet, guards.ua_or_user);
+                self.add_stylesheet(&ua_stylesheets.quirks_mode_stylesheet,
+                                    guards.ua_or_user, extra_data);
             }
         }
 
         for ref stylesheet in doc_stylesheets.iter() {
-            self.add_stylesheet(stylesheet, guards.author);
+            self.add_stylesheet(stylesheet, guards.author, extra_data);
         }
 
         debug!("Stylist stats:");
@@ -230,7 +267,8 @@ impl Stylist {
         true
     }
 
-    fn add_stylesheet(&mut self, stylesheet: &Stylesheet, guard: &SharedRwLockReadGuard) {
+    fn add_stylesheet<'a>(&mut self, stylesheet: &Stylesheet, guard: &SharedRwLockReadGuard,
+                          extra_data: &mut ExtraStyleData<'a>) {
         if stylesheet.disabled() || !stylesheet.is_effective_for_device(&self.device, guard) {
             return;
         }
@@ -274,7 +312,7 @@ impl Stylist {
                 }
                 CssRule::Import(ref import) => {
                     let import = import.read_with(guard);
-                    self.add_stylesheet(&import.stylesheet, guard)
+                    self.add_stylesheet(&import.stylesheet, guard, extra_data)
                 }
                 CssRule::Keyframes(ref keyframes_rule) => {
                     let keyframes_rule = keyframes_rule.read_with(guard);
@@ -284,6 +322,9 @@ impl Stylist {
                     debug!("Found valid keyframe animation: {:?}", animation);
                     self.animations.insert(keyframes_rule.name.clone(), animation);
                 }
+                CssRule::FontFace(ref rule) => {
+                    extra_data.add_font_face(&rule, stylesheet.origin);
+                }
                 // We don't care about any other rule.
                 _ => {}
             }