stylo: Implement object-position

MozReview-Commit-ID: 6mr4ktfeEGT

components/style/properties/gecko.mako.rs

@@ -342,6 +342,25 @@ def set_gecko_property(ffi_name, expr):
     % endif
 </%def>
 
+<%def name="impl_position(ident, gecko_ffi_name, need_clone=False)">
+    #[allow(non_snake_case)]
+    pub fn set_${ident}(&mut self, v: longhands::${ident}::computed_value::T) {
+        ${set_gecko_property("%s.mXPosition" % gecko_ffi_name, "v.horizontal.into()")}
+        ${set_gecko_property("%s.mYPosition" % gecko_ffi_name, "v.vertical.into()")}
+    }
+    <%call expr="impl_simple_copy(ident, gecko_ffi_name)"></%call>
+    % if need_clone:
+        #[allow(non_snake_case)]
+        pub fn clone_${ident}(&self) -> longhands::${ident}::computed_value::T {
+            use values::computed::Position;
+            Position {
+                horizontal: self.gecko.${gecko_ffi_name}.mXPosition.into(),
+                vertical: self.gecko.${gecko_ffi_name}.mYPosition.into(),
+            }
+        }
+    % endif
+</%def>
+
 <%def name="impl_color(ident, gecko_ffi_name, need_clone=False, complex_color=True)">
 <%call expr="impl_color_setter(ident, gecko_ffi_name, complex_color)"></%call>
 <%call expr="impl_color_copy(ident, gecko_ffi_name, complex_color)"></%call>
@@ -516,6 +535,7 @@ impl Debug for ${style_struct.gecko_struct_name} {
     predefined_types = {
         "length::LengthOrAuto": impl_style_coord,
         "Length": impl_absolute_length,
+        "Position": impl_position,
         "LengthOrPercentage": impl_style_coord,
         "LengthOrPercentageOrAuto": impl_style_coord,
         "LengthOrPercentageOrNone": impl_style_coord,
@@ -1183,7 +1203,7 @@ fn static_assert() {
                           animation-iteration-count animation-timing-function
                           -moz-binding page-break-before page-break-after
                           scroll-snap-points-x scroll-snap-points-y transform
-                          scroll-snap-type-y scroll-snap-destination scroll-snap-coordinate
+                          scroll-snap-type-y scroll-snap-coordinate
                           perspective-origin transform-origin""" %>
 <%self:impl_trait style_struct_name="Box" skip_longhands="${skip_box_longhands}">
 
@@ -1355,13 +1375,6 @@ fn static_assert() {
 
     ${impl_coord_copy('scroll_snap_points_y', 'mScrollSnapPointsY')}
 
-    pub fn set_scroll_snap_destination(&mut self, v: longhands::scroll_snap_destination::computed_value::T) {
-        self.gecko.mScrollSnapDestination.mXPosition = v.horizontal.into();
-        self.gecko.mScrollSnapDestination.mYPosition = v.vertical.into();
-    }
-
-    ${impl_simple_copy('scroll_snap_destination', 'mScrollSnapDestination')}
-
     pub fn set_scroll_snap_coordinate(&mut self, v: longhands::scroll_snap_coordinate::computed_value::T) {
         unsafe { self.gecko.mScrollSnapCoordinate.set_len_pod(v.0.len() as u32); }
         for (gecko, servo) in self.gecko.mScrollSnapCoordinate

components/style/properties/longhand/position.mako.rs

@@ -210,6 +210,14 @@ ${helpers.single_keyword("object-fit", "fill contain cover none scale-down",
                          products="gecko", animatable=False,
                          spec="https://drafts.csswg.org/css-images/#propdef-object-fit")}
 
+${helpers.predefined_type("object-position",
+                          "Position",
+                          "computed::Position::zero()",
+                          products="gecko",
+                          boxed="True",
+                          spec="https://drafts.csswg.org/css-images-3/#the-object-position",
+                          animatable=False)}
+
 <% grid_longhands = ["grid-row-start", "grid-row-end", "grid-column-start", "grid-column-end"] %>
 
 % for longhand in grid_longhands: