Auto merge of #15442 - BorisChiou:animation/opacity_transform, r=Manishearth

Retrieve the opacity and the transform list from RawServoAnimationValue

These are the servo-side changes for [bug 1335942](https://bugzilla.mozilla.org/show_bug.cgi?id=1335942). @Manishearth had already reviewed them there. Please merge these patches until the gecko-side changes for [bug 1335942](https://bugzilla.mozilla.org/show_bug.cgi?id=1335942) is landed.

---
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [bug 1335942](https://bugzilla.mozilla.org/show_bug.cgi?id=1335942).
- [X] These changes do not require tests because there are existing tests for this in mozilla-central

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6 files changed, 71 insertions, 19 deletions

diff --git a/components/style/build_gecko.rs b/components/style/build_gecko.rs
index f9e8da7c49e..2714a54bfc3 100644
--- a/components/style/build_gecko.rs
+++ b/components/style/build_gecko.rs
@@ -505,6 +505,7 @@ mod bindings {
             "RawServoDeclarationBlock",
             "RawGeckoPresContext",
             "RawGeckoPresContextOwned",
+            "RefPtr",
             "ThreadSafeURIHolder",
             "ThreadSafePrincipalHolder",
             "CSSPseudoClassType",
diff --git a/components/style/gecko_bindings/bindings.rs b/components/style/gecko_bindings/bindings.rs
index b16d0a442b3..579e82f0d8e 100644
--- a/components/style/gecko_bindings/bindings.rs
+++ b/components/style/gecko_bindings/bindings.rs
@@ -156,6 +156,7 @@ use gecko_bindings::structs::Loader;
 use gecko_bindings::structs::ServoStyleSheet;
 use gecko_bindings::structs::EffectCompositor_CascadeLevel;
 use gecko_bindings::structs::RawServoAnimationValueBorrowedListBorrowed;
+use gecko_bindings::structs::RefPtr;
 pub type nsTArrayBorrowed_uintptr_t<'a> = &'a mut ::gecko_bindings::structs::nsTArray<usize>;
 pub type ServoComputedValuesStrong = ::gecko_bindings::sugar::ownership::Strong<ServoComputedValues>;
 pub type ServoComputedValuesBorrowed<'a> = &'a ServoComputedValues;
@@ -1302,6 +1303,15 @@ extern "C" {
      -> RawServoDeclarationBlockStrong;
 }
 extern "C" {
+    pub fn Servo_AnimationValues_GetOpacity(value:
+                                                RawServoAnimationValueBorrowed)
+     -> f32;
+}
+extern "C" {
+    pub fn Servo_AnimationValues_GetTransform(value: RawServoAnimationValueBorrowed,
+                                              list: &mut RefPtr<nsCSSValueSharedList>);
+}
+extern "C" {
     pub fn Servo_ParseStyleAttribute(data: *const nsACString_internal)
      -> RawServoDeclarationBlockStrong;
 }
diff --git a/components/style/gecko_bindings/structs_debug.rs b/components/style/gecko_bindings/structs_debug.rs
index 90c6024aef4..cea18c5838e 100644
--- a/components/style/gecko_bindings/structs_debug.rs
+++ b/components/style/gecko_bindings/structs_debug.rs
@@ -5152,10 +5152,15 @@ pub mod root {
         pub struct ContainerLayerParameters([u8; 0]);
         #[repr(C)]
         #[derive(Debug)]
+        pub struct AnimationValue {
+            pub mGecko: root::mozilla::StyleAnimationValue,
+            pub mServo: root::RefPtr<root::RawServoAnimationValue>,
+        }
+        #[repr(C)]
+        #[derive(Debug)]
         pub struct PropertyStyleAnimationValuePair {
             pub mProperty: root::nsCSSPropertyID,
-            pub mValue: root::mozilla::StyleAnimationValue,
-            pub mServoValue: root::RefPtr<root::RawServoAnimationValue>,
+            pub mValue: root::mozilla::AnimationValue,
         }
         #[test]
         fn bindgen_test_layout_PropertyStyleAnimationValuePair() {
diff --git a/components/style/gecko_bindings/structs_release.rs b/components/style/gecko_bindings/structs_release.rs
index b32dcddc148..cd01ced5969 100644
--- a/components/style/gecko_bindings/structs_release.rs
+++ b/components/style/gecko_bindings/structs_release.rs
@@ -5068,10 +5068,15 @@ pub mod root {
         pub struct ContainerLayerParameters([u8; 0]);
         #[repr(C)]
         #[derive(Debug)]
+        pub struct AnimationValue {
+            pub mGecko: root::mozilla::StyleAnimationValue,
+            pub mServo: root::RefPtr<root::RawServoAnimationValue>,
+        }
+        #[repr(C)]
+        #[derive(Debug)]
         pub struct PropertyStyleAnimationValuePair {
             pub mProperty: root::nsCSSPropertyID,
-            pub mValue: root::mozilla::StyleAnimationValue,
-            pub mServoValue: root::RefPtr<root::RawServoAnimationValue>,
+            pub mValue: root::mozilla::AnimationValue,
         }
         #[test]
         fn bindgen_test_layout_PropertyStyleAnimationValuePair() {
diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 40ee0b2b2b7..ef02e3b3fbf 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -1322,7 +1322,7 @@ fn static_assert() {
                 "number" : "bindings::Gecko_CSSValue_SetNumber(%s, %s)",
             }
         %>
-        ComputedOperation::${name.title()}(${pattern}) => {
+        longhands::transform::computed_value::ComputedOperation::${name.title()}(${pattern}) => {
             bindings::Gecko_CSSValue_SetFunction(gecko_value, ${len(items) + 1});
             bindings::Gecko_CSSValue_SetKeyword(
                 bindings::Gecko_CSSValue_GetArrayItem(gecko_value, 0),
@@ -1336,27 +1336,20 @@ fn static_assert() {
             % endfor
         }
     </%def>
-    pub fn set_transform(&mut self, other: longhands::transform::computed_value::T) {
+    pub fn convert_transform(input: Vec<longhands::transform::computed_value::ComputedOperation>,
+                             output: &mut structs::root::RefPtr<structs::root::nsCSSValueSharedList>) {
         use gecko_bindings::structs::nsCSSKeyword::*;
         use gecko_bindings::sugar::refptr::RefPtr;
         use properties::longhands::transform::computed_value::ComputedMatrix;
-        use properties::longhands::transform::computed_value::ComputedOperation;
 
-        let vec = if let Some(v) = other.0 {
-            v
-        } else {
-            unsafe {
-                self.gecko.mSpecifiedTransform.clear();
-            }
-            return;
-        };
+        unsafe { output.clear() };
 
         let list = unsafe {
-            RefPtr::from_addrefed(bindings::Gecko_NewCSSValueSharedList(vec.len() as u32))
+            RefPtr::from_addrefed(bindings::Gecko_NewCSSValueSharedList(input.len() as u32))
         };
 
         let mut cur = list.mHead;
-        let mut iter = vec.into_iter();
+        let mut iter = input.into_iter();
         while !cur.is_null() {
             let gecko_value = unsafe { &mut (*cur).mValue };
             let servo = iter.next().expect("Gecko_NewCSSValueSharedList should create a shared \
@@ -1374,7 +1367,19 @@ fn static_assert() {
             }
         }
         debug_assert!(iter.next().is_none());
-        unsafe { self.gecko.mSpecifiedTransform.set_move(list) };
+        unsafe { output.set_move(list) };
+    }
+
+    pub fn set_transform(&mut self, other: longhands::transform::computed_value::T) {
+        let vec = if let Some(v) = other.0 {
+            v
+        } else {
+            unsafe {
+                self.gecko.mSpecifiedTransform.clear();
+            }
+            return;
+        };
+        Self::convert_transform(vec, &mut self.gecko.mSpecifiedTransform);
     }
 
     pub fn copy_transform_from(&mut self, other: &Self) {
diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index e075843a114..6ba9b8148de 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -53,11 +53,13 @@ use style::gecko_bindings::structs::Loader;
 use style::gecko_bindings::structs::RawGeckoPresContextOwned;
 use style::gecko_bindings::structs::RawServoAnimationValueBorrowedListBorrowed;
 use style::gecko_bindings::structs::ServoStyleSheet;
+use style::gecko_bindings::structs::nsCSSValueSharedList;
 use style::gecko_bindings::structs::nsTimingFunction;
 use style::gecko_bindings::structs::nsresult;
 use style::gecko_bindings::sugar::ownership::{FFIArcHelpers, HasArcFFI, HasBoxFFI};
 use style::gecko_bindings::sugar::ownership::{HasSimpleFFI, Strong};
 use style::gecko_bindings::sugar::refptr::{GeckoArcPrincipal, GeckoArcURI};
+use style::gecko_properties::style_structs;
 use style::keyframes::KeyframesStepValue;
 use style::parallel;
 use style::parser::{ParserContext, ParserContextExtraData};
@@ -205,6 +207,30 @@ pub extern "C" fn Servo_AnimationValues_Uncompute(value: RawServoAnimationValueB
     })).into_strong()
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_AnimationValues_GetOpacity(value: RawServoAnimationValueBorrowed)
+     -> f32
+{
+    let value = AnimationValue::as_arc(&value);
+    if let AnimationValue::Opacity(opacity) = **value {
+        opacity
+    } else {
+        panic!("The AnimationValue should be Opacity");
+    }
+}
+
+#[no_mangle]
+pub extern "C" fn Servo_AnimationValues_GetTransform(value: RawServoAnimationValueBorrowed,
+                                                     list: &mut structs::RefPtr<nsCSSValueSharedList>)
+{
+    let value = AnimationValue::as_arc(&value);
+    if let AnimationValue::Transform(ref servo_list) = **value {
+        style_structs::Box::convert_transform(servo_list.0.clone().unwrap(), list);
+    } else {
+        panic!("The AnimationValue should be transform");
+    }
+}
+
 /// Takes a ServoAnimationValues and populates it with the animation values corresponding
 /// to a given property declaration block
 #[no_mangle]
@@ -253,7 +279,7 @@ pub extern "C" fn Servo_AnimationValues_Populate(anim: RawGeckoAnimationValueLis
         // and thus can't directly use `geckoiter`
         let local_geckoiter = &mut geckoiter;
         for (gecko, servo) in local_geckoiter.zip(&mut iter) {
-            gecko.mServoValue.set_arc_leaky(Arc::new(servo));
+            gecko.mValue.mServo.set_arc_leaky(Arc::new(servo));
         }
     }