Stylo - add glue code for initial-letter property

components/style/properties/gecko.mako.rs

@@ -3012,7 +3012,7 @@ fn static_assert() {
 </%self:impl_trait>
 
 <%self:impl_trait style_struct_name="Text"
-                  skip_longhands="text-decoration-line text-overflow"
+                  skip_longhands="text-decoration-line text-overflow initial-letter"
                   skip_additionals="*">
 
     pub fn set_text_decoration_line(&mut self, v: longhands::text_decoration_line::computed_value::T) {
@@ -3093,6 +3093,29 @@ fn static_assert() {
         self.gecko.mTextOverflow.mLogicalDirections = other.gecko.mTextOverflow.mLogicalDirections;
     }
 
+    pub fn set_initial_letter(&mut self, v: longhands::initial_letter::computed_value::T) {
+        use properties::longhands::initial_letter::computed_value::T;
+        match v {
+            T::Normal => {
+                self.gecko.mInitialLetterSize = 0.;
+                self.gecko.mInitialLetterSink = 0;
+            },
+            T::Specified(size, sink) => {
+                self.gecko.mInitialLetterSize = size.value;
+                if let Some(sink) = sink {
+                    self.gecko.mInitialLetterSink = sink.value();
+                } else {
+                    self.gecko.mInitialLetterSink = size.value.floor() as i32;
+                }
+            }
+        }
+    }
+
+    pub fn copy_initial_letter_from(&mut self, other: &Self) {
+        self.gecko.mInitialLetterSize = other.gecko.mInitialLetterSize;
+        self.gecko.mInitialLetterSink = other.gecko.mInitialLetterSink;
+    }
+
     #[inline]
     pub fn has_underline(&self) -> bool {
         (self.gecko.mTextDecorationLine & (structs::NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE as u8)) != 0

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

@@ -233,7 +233,7 @@ ${helpers.predefined_type(
 
 <%helpers:longhand name="initial-letter"
                    animation_type="none"
-                   products="none"
+                   products="gecko"
                    spec="https://drafts.csswg.org/css-inline/#sizing-drop-initials">
     use std::fmt;
     use style_traits::ToCss;