layout: Make incremental reflow more fine-grained by introducing "reflow

out-of-flow" and "reconstruct flow" damage bits.

This is needed for good performance on the maze solver.

1 files changed, 11 insertions, 0 deletions

diff --git a/components/layout/util.rs b/components/layout/util.rs
index 9bb1a3ffa1f..c7ddbc0c596 100644
--- a/components/layout/util.rs
+++ b/components/layout/util.rs
@@ -42,6 +42,9 @@ pub struct PrivateLayoutData {
 
     /// Information needed during parallel traversals.
     pub parallel: DomParallelInfo,
+
+    /// Various flags.
+    pub flags: LayoutDataFlags,
 }
 
 impl PrivateLayoutData {
@@ -55,10 +58,18 @@ impl PrivateLayoutData {
             before_flow_construction_result: NoConstructionResult,
             after_flow_construction_result: NoConstructionResult,
             parallel: DomParallelInfo::new(),
+            flags: LayoutDataFlags::empty(),
         }
     }
 }
 
+bitflags! {
+    flags LayoutDataFlags: u8 {
+        #[doc="Whether a flow has been newly constructed."]
+        static HasNewlyConstructedFlow = 0x01
+    }
+}
+
 pub struct LayoutDataWrapper {
     pub chan: Option<LayoutChan>,
     pub shared_data: SharedLayoutData,