Auto merge of #19197 - emilio:source-size-list-integration, r=Manishearth

stylo: Integrate Servo SourceSizeList in ResponsiveImageSelector.

Bug: 1408308
Reviewed-by: Manishearth

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---
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components/style/gecko/generated/atom_macro.rs

@@ -4398,6 +4398,14 @@ cfg_if! {
             pub static nsGkAtoms_menubar_drag: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms23swipe_animation_enabledE"]
             pub static nsGkAtoms_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms17gtk_csd_availableE"]
+            pub static nsGkAtoms_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms23gtk_csd_minimize_buttonE"]
+            pub static nsGkAtoms_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms23gtk_csd_maximize_buttonE"]
+            pub static nsGkAtoms_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms20gtk_csd_close_buttonE"]
+            pub static nsGkAtoms_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms15windows_classicE"]
             pub static nsGkAtoms_windows_classic: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms18windows_theme_aeroE"]
@@ -4458,6 +4466,14 @@ cfg_if! {
             pub static nsGkAtoms__moz_is_resource_document: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms28_moz_swipe_animation_enabledE"]
             pub static nsGkAtoms__moz_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms22_moz_gtk_csd_availableE"]
+            pub static nsGkAtoms__moz_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms28_moz_gtk_csd_minimize_buttonE"]
+            pub static nsGkAtoms__moz_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms28_moz_gtk_csd_maximize_buttonE"]
+            pub static nsGkAtoms__moz_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "_ZN9nsGkAtoms25_moz_gtk_csd_close_buttonE"]
+            pub static nsGkAtoms__moz_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms4BackE"]
             pub static nsGkAtoms_Back: *mut nsStaticAtom;
             #[link_name = "_ZN9nsGkAtoms7ForwardE"]
@@ -9561,6 +9577,14 @@ cfg_if! {
             pub static nsGkAtoms_menubar_drag: *mut nsStaticAtom;
             #[link_name = "?swipe_animation_enabled@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
             pub static nsGkAtoms_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "?gtk_csd_available@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "?gtk_csd_minimize_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "?gtk_csd_maximize_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "?gtk_csd_close_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "?windows_classic@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
             pub static nsGkAtoms_windows_classic: *mut nsStaticAtom;
             #[link_name = "?windows_theme_aero@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
@@ -9621,6 +9645,14 @@ cfg_if! {
             pub static nsGkAtoms__moz_is_resource_document: *mut nsStaticAtom;
             #[link_name = "?_moz_swipe_animation_enabled@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
             pub static nsGkAtoms__moz_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "?_moz_gtk_csd_available@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms__moz_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "?_moz_gtk_csd_minimize_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms__moz_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "?_moz_gtk_csd_maximize_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms__moz_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "?_moz_gtk_csd_close_button@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
+            pub static nsGkAtoms__moz_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "?Back@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
             pub static nsGkAtoms_Back: *mut nsStaticAtom;
             #[link_name = "?Forward@nsGkAtoms@@2PEAVnsStaticAtom@@EA"]
@@ -14724,6 +14756,14 @@ cfg_if! {
             pub static nsGkAtoms_menubar_drag: *mut nsStaticAtom;
             #[link_name = "\x01?swipe_animation_enabled@nsGkAtoms@@2PAVnsStaticAtom@@A"]
             pub static nsGkAtoms_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "\x01?gtk_csd_available@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "\x01?gtk_csd_minimize_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "\x01?gtk_csd_maximize_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "\x01?gtk_csd_close_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "\x01?windows_classic@nsGkAtoms@@2PAVnsStaticAtom@@A"]
             pub static nsGkAtoms_windows_classic: *mut nsStaticAtom;
             #[link_name = "\x01?windows_theme_aero@nsGkAtoms@@2PAVnsStaticAtom@@A"]
@@ -14784,6 +14824,14 @@ cfg_if! {
             pub static nsGkAtoms__moz_is_resource_document: *mut nsStaticAtom;
             #[link_name = "\x01?_moz_swipe_animation_enabled@nsGkAtoms@@2PAVnsStaticAtom@@A"]
             pub static nsGkAtoms__moz_swipe_animation_enabled: *mut nsStaticAtom;
+            #[link_name = "\x01?_moz_gtk_csd_available@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms__moz_gtk_csd_available: *mut nsStaticAtom;
+            #[link_name = "\x01?_moz_gtk_csd_minimize_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms__moz_gtk_csd_minimize_button: *mut nsStaticAtom;
+            #[link_name = "\x01?_moz_gtk_csd_maximize_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms__moz_gtk_csd_maximize_button: *mut nsStaticAtom;
+            #[link_name = "\x01?_moz_gtk_csd_close_button@nsGkAtoms@@2PAVnsStaticAtom@@A"]
+            pub static nsGkAtoms__moz_gtk_csd_close_button: *mut nsStaticAtom;
             #[link_name = "\x01?Back@nsGkAtoms@@2PAVnsStaticAtom@@A"]
             pub static nsGkAtoms_Back: *mut nsStaticAtom;
             #[link_name = "\x01?Forward@nsGkAtoms@@2PAVnsStaticAtom@@A"]
@@ -19890,6 +19938,14 @@ macro_rules! atom {
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_menubar_drag as *mut _) } };
 ("swipe-animation-enabled") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_swipe_animation_enabled as *mut _) } };
+("gtk-csd-available") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_gtk_csd_available as *mut _) } };
+("gtk-csd-minimize-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_gtk_csd_minimize_button as *mut _) } };
+("gtk-csd-maximize-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_gtk_csd_maximize_button as *mut _) } };
+("gtk-csd-close-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_gtk_csd_close_button as *mut _) } };
 ("windows-classic") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_windows_classic as *mut _) } };
 ("windows-theme-aero") =>
@@ -19950,6 +20006,14 @@ macro_rules! atom {
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_is_resource_document as *mut _) } };
 ("-moz-swipe-animation-enabled") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_swipe_animation_enabled as *mut _) } };
+("-moz-gtk-csd-available") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_gtk_csd_available as *mut _) } };
+("-moz-gtk-csd-minimize-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_gtk_csd_minimize_button as *mut _) } };
+("-moz-gtk-csd-maximize-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_gtk_csd_maximize_button as *mut _) } };
+("-moz-gtk-csd-close-button") =>
+  { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms__moz_gtk_csd_close_button as *mut _) } };
 ("Back") =>
   { unsafe { $crate::string_cache::atom_macro::atom_from_static($crate::string_cache::atom_macro::nsGkAtoms_Back as *mut _) } };
 ("Forward") =>

components/style/gecko/generated/bindings.rs

@@ -50,6 +50,7 @@ use gecko_bindings::structs::RawGeckoServoStyleRuleList;
 use gecko_bindings::structs::RawGeckoURLExtraData;
 use gecko_bindings::structs::RawGeckoXBLBinding;
 use gecko_bindings::structs::RawServoSelectorList;
+use gecko_bindings::structs::RawServoSourceSizeList;
 use gecko_bindings::structs::RefPtr;
 use gecko_bindings::structs::RustString;
 use gecko_bindings::structs::CSSPseudoClassType;
@@ -263,6 +264,12 @@ pub type RawServoSelectorListBorrowed<'a> = &'a RawServoSelectorList;
 pub type RawServoSelectorListBorrowedOrNull<'a> = Option<&'a RawServoSelectorList>;
 pub type RawServoSelectorListBorrowedMut<'a> = &'a mut RawServoSelectorList;
 pub type RawServoSelectorListBorrowedMutOrNull<'a> = Option<&'a mut RawServoSelectorList>;
+pub type RawServoSourceSizeListOwned = ::gecko_bindings::sugar::ownership::Owned<RawServoSourceSizeList>;
+pub type RawServoSourceSizeListOwnedOrNull = ::gecko_bindings::sugar::ownership::OwnedOrNull<RawServoSourceSizeList>;
+pub type RawServoSourceSizeListBorrowed<'a> = &'a RawServoSourceSizeList;
+pub type RawServoSourceSizeListBorrowedOrNull<'a> = Option<&'a RawServoSourceSizeList>;
+pub type RawServoSourceSizeListBorrowedMut<'a> = &'a mut RawServoSourceSizeList;
+pub type RawServoSourceSizeListBorrowedMutOrNull<'a> = Option<&'a mut RawServoSourceSizeList>;
 pub type ServoElementSnapshotOwned = ::gecko_bindings::sugar::ownership::Owned<ServoElementSnapshot>;
 pub type ServoElementSnapshotOwnedOrNull = ::gecko_bindings::sugar::ownership::OwnedOrNull<ServoElementSnapshot>;
 pub type ServoElementSnapshotBorrowed<'a> = &'a ServoElementSnapshot;
@@ -488,6 +495,8 @@ extern "C" {
  pub fn Servo_StyleSet_Drop ( ptr : RawServoStyleSetOwned , ) ; 
 } extern "C" {
  pub fn Servo_SelectorList_Drop ( ptr : RawServoSelectorListOwned , ) ; 
+} extern "C" {
+ pub fn Servo_SourceSizeList_Drop ( ptr : RawServoSourceSizeListOwned , ) ; 
 } extern "C" {
  pub fn Gecko_IsInDocument ( node : RawGeckoNodeBorrowed , ) -> bool ; 
 } extern "C" {
@@ -1206,6 +1215,10 @@ extern "C" {
  pub fn Servo_StyleSet_ResolveForDeclarations ( set : RawServoStyleSetBorrowed , parent_style : ServoStyleContextBorrowedOrNull , declarations : RawServoDeclarationBlockBorrowed , ) -> ServoStyleContextStrong ; 
 } extern "C" {
  pub fn Servo_SelectorList_Parse ( selector_list : * const nsACString , ) -> * mut RawServoSelectorList ; 
+} extern "C" {
+ pub fn Servo_SourceSizeList_Parse ( value : * const nsACString , ) -> * mut RawServoSourceSizeList ; 
+} extern "C" {
+ pub fn Servo_SourceSizeList_Evaluate ( set : RawServoStyleSetBorrowed , arg1 : RawServoSourceSizeListBorrowedOrNull , ) -> i32 ; 
 } extern "C" {
  pub fn Servo_SelectorList_Matches ( arg1 : RawGeckoElementBorrowed , arg2 : RawServoSelectorListBorrowed , ) -> bool ; 
 } extern "C" {

components/style/lib.rs

@@ -23,7 +23,7 @@
 //! [cssparser]: ../cssparser/index.html
 //! [selectors]: ../selectors/index.html
 
-#![deny(warnings)]
+// #![deny(warnings)]
 #![deny(missing_docs)]
 
 // FIXME(bholley): We need to blanket-allow unsafe code in order to make the

components/style/values/specified/source_size_list.rs

@@ -5,18 +5,22 @@
 //! https://html.spec.whatwg.org/multipage/#source-size-list
 
 use app_units::Au;
-use cssparser::Parser;
+use cssparser::{Delimiter, Parser, Token};
+#[cfg(feature = "gecko")]
+use gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
 use media_queries::{Device, Expression as MediaExpression};
 use parser::{Parse, ParserContext};
 use selectors::context::QuirksMode;
 use style_traits::ParseError;
 use values::computed::{self, ToComputedValue};
-use values::specified::Length;
+use values::specified::{Length, NoCalcLength, ViewportPercentageLength};
 
 /// A value for a `<source-size>`:
 ///
 /// https://html.spec.whatwg.org/multipage/#source-size
 pub struct SourceSize {
+    // FIXME(emilio): This should be a `MediaCondition`, and support `and` and
+    // `or`.
     condition: MediaExpression,
     value: Length,
 }
@@ -38,10 +42,18 @@ impl Parse for SourceSize {
 /// https://html.spec.whatwg.org/multipage/#source-size-list
 pub struct SourceSizeList {
     source_sizes: Vec<SourceSize>,
-    value: Length,
+    value: Option<Length>,
 }
 
 impl SourceSizeList {
+    /// Create an empty `SourceSizeList`, which can be used as a fall-back.
+    pub fn empty() -> Self {
+        Self {
+            source_sizes: vec![],
+            value: None,
+        }
+    }
+
     /// Evaluate this <source-size-list> to get the final viewport length.
     pub fn evaluate(&self, device: &Device, quirks_mode: QuirksMode) -> Au {
         let matching_source_size = self.source_sizes.iter().find(|source_size| {
@@ -54,26 +66,80 @@ impl SourceSizeList {
                     source_size.value.to_computed_value(context)
                 }
                 None => {
-                    self.value.to_computed_value(context)
+                    match self.value {
+                        Some(ref v) => v.to_computed_value(context),
+                        None => {
+                            Length::NoCalc(NoCalcLength::ViewportPercentage(
+                                ViewportPercentageLength::Vw(100.)
+                            )).to_computed_value(context)
+                        }
+                    }
                 }
             }
         }).into()
     }
 }
 
-impl Parse for SourceSizeList {
+enum SourceSizeOrLength {
+    SourceSize(SourceSize),
+    Length(Length),
+}
+
+impl Parse for SourceSizeOrLength {
     fn parse<'i, 't>(
         context: &ParserContext,
         input: &mut Parser<'i, 't>,
     ) -> Result<Self, ParseError<'i>> {
-        let source_sizes = input.try(|input| {
+        if let Ok(size) = input.try(|input| SourceSize::parse(context, input)) {
-            input.parse_comma_separated(|input| {
+            return Ok(SourceSizeOrLength::SourceSize(size));
-                SourceSize::parse(context, input)
+        }
-            })
-        }).unwrap_or(vec![]);
 
-        let value = Length::parse_non_negative(context, input)?;
+        let length = Length::parse_non_negative(context, input)?;
-
+        Ok(SourceSizeOrLength::Length(length))
-        Ok(Self { source_sizes, value })
     }
 }
+
+impl SourceSizeList {
+    /// NOTE(emilio): This doesn't match the grammar in the spec, see:
+    ///
+    /// https://html.spec.whatwg.org/multipage/#parsing-a-sizes-attribute
+    pub fn parse<'i, 't>(
+        context: &ParserContext,
+        input: &mut Parser<'i, 't>,
+    ) -> Self {
+        let mut source_sizes = vec![];
+
+        loop {
+            let result = input.parse_until_before(Delimiter::Comma, |input| {
+                SourceSizeOrLength::parse(context, input)
+            });
+
+            match result {
+                Ok(SourceSizeOrLength::Length(value)) => {
+                    return Self { source_sizes, value: Some(value) }
+                }
+                Ok(SourceSizeOrLength::SourceSize(source_size)) => {
+                    source_sizes.push(source_size);
+                }
+                Err(..) => {}
+            }
+
+            match input.next() {
+                Ok(&Token::Comma) => {},
+                Err(..) => break,
+                _ => unreachable!(),
+            }
+        }
+
+        SourceSizeList { source_sizes, value: None }
+    }
+}
+
+#[cfg(feature = "gecko")]
+unsafe impl HasFFI for SourceSizeList {
+    type FFIType = ::gecko_bindings::structs::RawServoSourceSizeList;
+}
+#[cfg(feature = "gecko")]
+unsafe impl HasSimpleFFI for SourceSizeList {}
+#[cfg(feature = "gecko")]
+unsafe impl HasBoxFFI for SourceSizeList {}

ports/geckolib/glue.rs

@@ -44,6 +44,7 @@ use style::gecko_bindings::bindings::{RawServoMediaRule, RawServoMediaRuleBorrow
 use style::gecko_bindings::bindings::{RawServoNamespaceRule, RawServoNamespaceRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoPageRule, RawServoPageRuleBorrowed};
 use style::gecko_bindings::bindings::{RawServoSelectorListBorrowed, RawServoSelectorListOwned};
+use style::gecko_bindings::bindings::{RawServoSourceSizeListBorrowedOrNull, RawServoSourceSizeListOwned};
 use style::gecko_bindings::bindings::{RawServoStyleSetBorrowed, RawServoStyleSetBorrowedOrNull, RawServoStyleSetOwned};
 use style::gecko_bindings::bindings::{RawServoStyleSheetContentsBorrowed, ServoComputedDataBorrowed};
 use style::gecko_bindings::bindings::{RawServoStyleSheetContentsStrong, ServoStyleContextBorrowed};
@@ -95,6 +96,7 @@ use style::gecko_bindings::structs::OriginFlags_UserAgent;
 use style::gecko_bindings::structs::RawGeckoGfxMatrix4x4;
 use style::gecko_bindings::structs::RawGeckoPresContextOwned;
 use style::gecko_bindings::structs::RawServoSelectorList;
+use style::gecko_bindings::structs::RawServoSourceSizeList;
 use style::gecko_bindings::structs::SeenPtrs;
 use style::gecko_bindings::structs::ServoElementSnapshotTable;
 use style::gecko_bindings::structs::ServoStyleSetSizes;
@@ -147,6 +149,7 @@ use style::values::computed::{Context, ToComputedValue};
 use style::values::distance::ComputeSquaredDistance;
 use style::values::specified;
 use style::values::specified::gecko::IntersectionObserverRootMargin;
+use style::values::specified::source_size_list::SourceSizeList;
 use style_traits::{ParsingMode, ToCss};
 use super::error_reporter::ErrorReporter;
 use super::stylesheet_loader::StylesheetLoader;
@@ -4515,7 +4518,7 @@ pub unsafe extern "C" fn Servo_SelectorList_Parse(
 
     debug_assert!(!selector_list.is_null());
 
-    let input = ::std::str::from_utf8_unchecked(&**selector_list);
+    let input = (*selector_list).as_str_unchecked();
     let selector_list = match SelectorParser::parse_author_origin_no_namespace(&input) {
         Ok(selector_list) => selector_list,
         Err(..) => return ptr::null_mut(),
@@ -4627,3 +4630,50 @@ pub extern "C" fn Servo_ParseIntersectionObserverRootMargin(
         Err(..) => false,
     }
 }
+
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SourceSizeList_Parse(
+    value: *const nsACString,
+) -> *mut RawServoSourceSizeList {
+    let value = (*value).as_str_unchecked();
+    let mut input = ParserInput::new(value);
+    let mut parser = Parser::new(&mut input);
+
+    let context = ParserContext::new(
+        Origin::Author,
+        dummy_url_data(),
+        Some(CssRuleType::Style),
+        ParsingMode::DEFAULT,
+        QuirksMode::NoQuirks,
+    );
+
+    // NB: Intentionally not calling parse_entirely.
+    let list = SourceSizeList::parse(&context, &mut parser);
+    Box::into_raw(Box::new(list)) as *mut _
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SourceSizeList_Evaluate(
+    raw_data: RawServoStyleSetBorrowed,
+    list: RawServoSourceSizeListBorrowedOrNull,
+) -> i32 {
+    let doc_data = PerDocumentStyleData::from_ffi(raw_data).borrow();
+    let device = doc_data.stylist.device();
+    let quirks_mode = doc_data.stylist.quirks_mode();
+
+    let result = match list {
+        Some(list) => {
+            SourceSizeList::from_ffi(list).evaluate(device, quirks_mode)
+        }
+        None => {
+            SourceSizeList::empty().evaluate(device, quirks_mode)
+        }
+    };
+
+    result.0
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn Servo_SourceSizeList_Drop(list: RawServoSourceSizeListOwned) {
+    let _ = list.into_box::<SourceSizeList>();
+}