style: Unpack StyleMotion and use cbindgen for OffsetPath.

Unpack StyleMotion and move its members into nsStyleDisplay, use
cbindgen to generate StyleOffsetPath.

Differential Revision: https://phabricator.services.mozilla.com/D31164

components/style/properties/gecko.mako.rs

@@ -2205,8 +2205,7 @@ fn static_assert() {
                           transition-timing-function transition-property
                           transform-style scroll-snap-points-x
                           scroll-snap-points-y scroll-snap-coordinate
-                          -moz-binding offset-path shape-outside
+                          -moz-binding shape-outside -webkit-line-clamp""" %>
-                          -webkit-line-clamp""" %>
 <%self:impl_trait style_struct_name="Box" skip_longhands="${skip_box_longhands}">
     #[inline]
     pub fn set_display(&mut self, v: longhands::display::computed_value::T) {
@@ -2513,39 +2512,6 @@ fn static_assert() {
 
     <% impl_shape_source("shape_outside", "mShapeOutside") %>
 
-    pub fn set_offset_path(&mut self, v: longhands::offset_path::computed_value::T) {
-        use crate::gecko_bindings::bindings::{Gecko_NewStyleMotion, Gecko_SetStyleMotion};
-        use crate::gecko_bindings::structs::StyleShapeSourceType;
-        use crate::values::generics::basic_shape::FillRule;
-        use crate::values::specified::OffsetPath;
-
-        let motion = unsafe { Gecko_NewStyleMotion().as_mut().unwrap() };
-        match v {
-            OffsetPath::None => motion.mOffsetPath.mType = StyleShapeSourceType::None,
-            OffsetPath::Path(p) => {
-                set_style_svg_path(&mut motion.mOffsetPath, p, FillRule::Nonzero)
-            },
-        }
-        unsafe { Gecko_SetStyleMotion(&mut self.gecko.mMotion, motion) };
-    }
-
-    pub fn clone_offset_path(&self) -> longhands::offset_path::computed_value::T {
-        use crate::values::specified::OffsetPath;
-        match unsafe { self.gecko.mMotion.mPtr.as_ref() } {
-            None => OffsetPath::none(),
-            Some(v) => (&v.mOffsetPath).into()
-        }
-    }
-
-    pub fn copy_offset_path_from(&mut self, other: &Self) {
-        use crate::gecko_bindings::bindings::Gecko_CopyStyleMotions;
-        unsafe { Gecko_CopyStyleMotions(&mut self.gecko.mMotion, other.gecko.mMotion.mPtr) };
-    }
-
-    pub fn reset_offset_path(&mut self, other: &Self) {
-        self.copy_offset_path_from(other);
-    }
-
     #[allow(non_snake_case)]
     pub fn set__webkit_line_clamp(&mut self, v: longhands::_webkit_line_clamp::computed_value::T) {
         self.gecko.mLineClamp = match v {

components/style/values/specified/motion.rs

@@ -12,6 +12,7 @@ use style_traits::{ParseError, StyleParseErrorKind};
 /// The offset-path value.
 ///
 /// https://drafts.fxtf.org/motion-1/#offset-path-property
+/// cbindgen:derive-tagged-enum-copy-constructor=true
 #[derive(
     Animate,
     Clone,
@@ -26,6 +27,7 @@ use style_traits::{ParseError, StyleParseErrorKind};
     ToResolvedValue,
     ToShmem,
 )]
+#[repr(C, u8)]
 pub enum OffsetPath {
     // We could merge SVGPathData into ShapeSource, so we could reuse them. However,
     // we don't want to support other value for offset-path, so use SVGPathData only for now.