Use bitflags! for RestyleDamage

src/components/main/css/node_util.rs

@@ -68,7 +68,7 @@ impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
         let default = if self.node_is_element() {
             RestyleDamage::all()
         } else {
-            RestyleDamage::none()
+            RestyleDamage::empty()
         };
 
         let layout_data_ref = self.borrow_layout_data();
@@ -76,7 +76,6 @@ impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
             .get_ref()
             .data
             .restyle_damage
-            .map(|x| RestyleDamage::from_int(x))
             .unwrap_or(default)
     }
 
@@ -84,7 +83,7 @@ impl<'ln> NodeUtil for ThreadSafeLayoutNode<'ln> {
     fn set_restyle_damage(&self, damage: RestyleDamage) {
         let mut layout_data_ref = self.mutate_layout_data();
         match &mut *layout_data_ref {
-            &Some(ref mut layout_data) => layout_data.data.restyle_damage = Some(damage.to_int()),
+            &Some(ref mut layout_data) => layout_data.data.restyle_damage = Some(damage),
             _ => fail!("no layout data for this node"),
         }
     }

src/components/main/layout/incremental.rs

@@ -4,100 +4,34 @@
 
 use style::ComputedValues;
 
-/// Individual layout actions that may be necessary after restyling.
-///
-/// If you add to this enum, also add the value to RestyleDamage::all below.
-/// (FIXME: do this automatically)
-pub enum RestyleEffect {
-    /// Repaint the node itself.
-    /// Currently unused; need to decide how this propagates.
-    Repaint = 0x01,
+bitflags! {
+    #[doc = "Individual layout actions that may be necessary after restyling."]
+    flags RestyleDamage: int {
+        #[doc = "Repaint the node itself."]
+        #[doc = "Currently unused; need to decide how this propagates."]
+        static Repaint = 0x01,
 
-    /// Recompute intrinsic widths (minimum and preferred).
-    /// Propagates down the flow tree because the computation is
-    /// bottom-up.
-    BubbleWidths = 0x02,
+        #[doc = "Recompute intrinsic widths (minimum and preferred)."]
+        #[doc = "Propagates down the flow tree because the computation is"]
+        #[doc = "bottom-up."]
+        static BubbleWidths = 0x02,
 
-    /// Recompute actual widths and heights.
-    /// Propagates up the flow tree because the computation is
-    /// top-down.
-    Reflow = 0x04,
+        #[doc = "Recompute actual widths and heights."]
+        #[doc = "Propagates up the flow tree because the computation is"]
+        #[doc = "top-down."]
+        static Reflow = 0x04
+    }
 }
 
-/// A set of RestyleEffects.
-// FIXME: Switch to librustc/util/enum_set.rs if that gets moved into
-// libextra (Rust #8054)
-pub struct RestyleDamage {
-    bits: int
-}
-
-// Provide literal syntax of the form restyle_damage!(Repaint, Reflow)
-macro_rules! restyle_damage(
-    ( $($damage:ident),* ) => (
-        RestyleDamage::none() $( .add($damage) )*
-    )
-)
-
 impl RestyleDamage {
-    pub fn none() -> RestyleDamage {
-        RestyleDamage { bits: 0 }
-    }
-
-    pub fn all() -> RestyleDamage {
-        restyle_damage!(Repaint, BubbleWidths, Reflow)
-    }
-
-    /// Create a RestyleDamage from the underlying bit field.
-    /// We would rather not allow this, but some types in script
-    /// need to store RestyleDamage without depending on this crate.
-    pub fn from_int(n: int) -> RestyleDamage {
-        RestyleDamage { bits: n }
-    }
-
-    pub fn to_int(self) -> int {
-        self.bits
-    }
-
-    pub fn is_empty(self) -> bool {
-        self.bits == 0
-    }
-
-    pub fn is_nonempty(self) -> bool {
-        self.bits != 0
-    }
-
-    pub fn add(self, effect: RestyleEffect) -> RestyleDamage {
-        RestyleDamage { bits: self.bits | (effect as int) }
-    }
-
-    pub fn has(self, effect: RestyleEffect) -> bool {
-        (self.bits & (effect as int)) != 0
-    }
-
-    pub fn lacks(self, effect: RestyleEffect) -> bool {
-        (self.bits & (effect as int)) == 0
-    }
-
-    pub fn union(self, other: RestyleDamage) -> RestyleDamage {
-        RestyleDamage { bits: self.bits | other.bits }
-    }
-
-    pub fn union_in_place(&mut self, other: RestyleDamage) {
-        self.bits = self.bits | other.bits;
-    }
-
-    pub fn intersect(self, other: RestyleDamage) -> RestyleDamage {
-        RestyleDamage { bits: self.bits & other.bits }
-    }
-
     /// Elements of self which should also get set on any ancestor flow.
     pub fn propagate_up(self) -> RestyleDamage {
-        self.intersect(restyle_damage!(Reflow))
+        self & Reflow
     }
 
     /// Elements of self which should also get set on any child flows.
     pub fn propagate_down(self) -> RestyleDamage {
-        self.intersect(restyle_damage!(BubbleWidths))
+        self & BubbleWidths
     }
 }
 
@@ -108,13 +42,13 @@ macro_rules! add_if_not_equal(
     ($old:ident, $new:ident, $damage:ident,
      [ $($effect:ident),* ], [ $($style_struct_getter:ident.$name:ident),* ]) => ({
         if $( ($old.$style_struct_getter().$name != $new.$style_struct_getter().$name) )||* {
-            $damage.union_in_place( restyle_damage!( $($effect),* ) );
+            $damage.insert($($effect)|*);
         }
     })
 )
 
 pub fn compute_damage(old: &ComputedValues, new: &ComputedValues) -> RestyleDamage {
-    let mut damage = RestyleDamage::none();
+    let mut damage = RestyleDamage::empty();
 
     // This checks every CSS property, as enumerated in
     // impl<'self> CssComputedStyle<'self>
@@ -142,57 +76,3 @@ pub fn compute_damage(old: &ComputedValues, new: &ComputedValues) -> RestyleDama
 
     damage
 }
-
-
-#[cfg(test)]
-mod restyle_damage_tests {
-    use super::*;
-
-    #[test]
-    fn none_is_empty() {
-        let d = RestyleDamage::none();
-        assert!(!d.has(Repaint));
-        assert!(!d.has(BubbleWidths));
-        assert!(d.lacks(Repaint));
-        assert!(d.lacks(BubbleWidths));
-    }
-
-    #[test]
-    fn all_is_full() {
-        let d = RestyleDamage::all();
-        assert!(d.has(Repaint));
-        assert!(d.has(BubbleWidths));
-        assert!(!d.lacks(Repaint));
-        assert!(!d.lacks(BubbleWidths));
-    }
-
-    #[test]
-    fn can_add() {
-        assert!(RestyleDamage::none().add(BubbleWidths).has(BubbleWidths));
-    }
-
-    #[test]
-    fn can_union() {
-        let d = restyle_damage!(Repaint).union(restyle_damage!(BubbleWidths));
-        assert!(d.has(Repaint));
-        assert!(d.has(BubbleWidths));
-    }
-
-    #[test]
-    fn can_union_in_place() {
-        let mut d = restyle_damage!(Repaint);
-        d.union_in_place(restyle_damage!(BubbleWidths));
-        assert!(d.has(Repaint));
-        assert!(d.has(BubbleWidths));
-    }
-
-    #[test]
-    fn can_intersect() {
-        let x = restyle_damage!(Repaint, BubbleWidths);
-        let y = restyle_damage!(Repaint, Reflow);
-        let d = x.intersect(y);
-        assert!(d.has(Repaint));
-        assert!(d.lacks(BubbleWidths));
-        assert!(d.lacks(Reflow));
-    }
-}

src/components/main/layout/inline.rs

@@ -750,7 +750,7 @@ impl InlineFragments {
                 style: other_style,
                 range: mut other_range
             } = other_range;
- 
+
             other_range.shift_by(adjustment);
             self.push_range(other_style, other_range)
         }

src/components/main/layout/layout_task.rs

@@ -118,7 +118,7 @@ impl PostorderFlowTraversal for ComputeDamageTraversal {
     fn process(&mut self, flow: &mut Flow) -> bool {
         let mut damage = flow::base(flow).restyle_damage;
         for child in flow::child_iter(flow) {
-            damage.union_in_place(flow::base(child).restyle_damage.propagate_up())
+            damage.insert(flow::base(child).restyle_damage.propagate_up())
         }
         flow::mut_base(flow).restyle_damage = damage;
         true
@@ -136,14 +136,14 @@ impl PreorderFlowTraversal for PropagateDamageTraversal {
     #[inline]
     fn process(&mut self, flow: &mut Flow) -> bool {
         if self.all_style_damage {
-            flow::mut_base(flow).restyle_damage.union_in_place(RestyleDamage::all())
+            flow::mut_base(flow).restyle_damage.insert(RestyleDamage::all())
         }
         debug!("restyle damage = {:?}", flow::base(flow).restyle_damage);
 
         let prop = flow::base(flow).restyle_damage.propagate_down();
-        if prop.is_nonempty() {
+        if !prop.is_empty() {
             for kid_ctx in flow::child_iter(flow) {
-                flow::mut_base(kid_ctx).restyle_damage.union_in_place(prop)
+                flow::mut_base(kid_ctx).restyle_damage.insert(prop)
             }
         }
         true

src/components/main/layout/util.rs

@@ -3,6 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use layout::construct::{ConstructionResult, NoConstructionResult};
+use layout::incremental::RestyleDamage;
 use layout::parallel::DomParallelInfo;
 use layout::wrapper::{LayoutNode, TLayoutNode, ThreadSafeLayoutNode};
 
@@ -28,7 +29,7 @@ pub struct PrivateLayoutData {
     pub after_style: Option<Arc<ComputedValues>>,
 
     /// Description of how to account for recent style changes.
-    pub restyle_damage: Option<int>,
+    pub restyle_damage: Option<RestyleDamage>,
 
     /// The current results of flow construction for this node. This is either a flow or a
     /// `ConstructionItem`. See comments in `construct.rs` for more details.