Provide @font-face rules for stylo backend.

components/style/build_gecko.rs

@@ -588,6 +588,7 @@ mod bindings {
             "RawGeckoElement",
             "RawGeckoKeyframeList",
             "RawGeckoComputedKeyframeValuesList",
+            "RawGeckoFontFaceRuleList",
             "RawGeckoNode",
             "RawGeckoAnimationValueList",
             "RawServoAnimationValue",
@@ -706,6 +707,7 @@ mod bindings {
             "RawGeckoAnimationValueList",
             "RawGeckoKeyframeList",
             "RawGeckoComputedKeyframeValuesList",
+            "RawGeckoFontFaceRuleList",
         ];
         for &ty in structs_types.iter() {
             builder = builder.hide_type(ty)

components/style/gecko/conversions.rs

@@ -13,9 +13,9 @@ use gecko::values::{convert_rgba_to_nscolor, GeckoStyleCoordConvertible};
 use gecko_bindings::bindings::{Gecko_CreateGradient, Gecko_SetGradientImageValue, Gecko_SetUrlImageValue};
 use gecko_bindings::bindings::Gecko_InitializeImageCropRect;
 use gecko_bindings::structs::{nsStyleCoord_CalcValue, nsStyleImage};
-use gecko_bindings::structs::nsresult;
+use gecko_bindings::structs::{nsresult, SheetType};
 use gecko_bindings::sugar::ns_style_coord::{CoordDataValue, CoordDataMut};
-use stylesheets::RulesMutateError;
+use stylesheets::{Origin, RulesMutateError};
 use values::computed::{CalcLengthOrPercentage, Gradient, Image, LengthOrPercentage, LengthOrPercentageOrAuto};
 
 impl From<CalcLengthOrPercentage> for nsStyleCoord_CalcValue {
@@ -503,3 +503,13 @@ impl From<RulesMutateError> for nsresult {
         }
     }
 }
+
+impl From<Origin> for SheetType {
+    fn from(other: Origin) -> Self {
+        match other {
+            Origin::UserAgent => SheetType::Agent,
+            Origin::Author => SheetType::Doc,
+            Origin::User => SheetType::User,
+        }
+    }
+}

ports/geckolib/glue.rs

@@ -43,6 +43,7 @@ use style::gecko_bindings::bindings::{nsACString, nsAString};
 use style::gecko_bindings::bindings::Gecko_AnimationAppendKeyframe;
 use style::gecko_bindings::bindings::RawGeckoComputedKeyframeValuesListBorrowedMut;
 use style::gecko_bindings::bindings::RawGeckoElementBorrowed;
+use style::gecko_bindings::bindings::RawGeckoFontFaceRuleListBorrowedMut;
 use style::gecko_bindings::bindings::RawServoAnimationValueBorrowed;
 use style::gecko_bindings::bindings::RawServoAnimationValueMapBorrowed;
 use style::gecko_bindings::bindings::RawServoAnimationValueStrong;
@@ -1743,3 +1744,18 @@ pub extern "C" fn Servo_StyleSet_FillKeyframesForName(raw_data: RawServoStyleSet
     false
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleSet_GetFontFaceRules(raw_data: RawServoStyleSetBorrowed,
+                                                  rules: RawGeckoFontFaceRuleListBorrowedMut) {
+    let data = PerDocumentStyleData::from_ffi(raw_data).borrow();
+    debug_assert!(rules.len() == 0);
+
+    let global_style_data = &*GLOBAL_STYLE_DATA;
+    let guard = global_style_data.shared_lock.read();
+
+    unsafe { rules.set_len(data.font_faces.len() as u32) };
+    for (src, dest) in data.font_faces.iter().zip(rules.iter_mut()) {
+        dest.mRule = src.0.read_with(&guard).clone().forget();
+        dest.mSheetType = src.1.into();
+    }
+}