From 1e2c9293c623c1869b0dd549b9f13291a95ae7f8 Mon Sep 17 00:00:00 2001
From: Cameron McCormack <cam@mcc.id.au>
Date: Wed, 1 Nov 2017 21:20:39 +1100
Subject: [PATCH] Bug 1390694 - Part 1: Add ServoStyleSet function for checking
 document state dependencies. r=emilio

MozReview-Commit-ID: G8Ju8yHtYx6

--HG--
extra : rebase_source : 11f25c9b9b9a45144170ff9e563e52577ca8cea2
extra : source : 38302acda5cdb8a808ee80430488d83527a415ff
---
 layout/style/ServoBindingList.h | 3 +++
 layout/style/ServoStyleSet.cpp  | 7 +++++++
 layout/style/ServoStyleSet.h    | 6 ++++++
 3 files changed, 16 insertions(+)

diff --git a/layout/style/ServoBindingList.h b/layout/style/ServoBindingList.h
index eae6b75b86ed..95b49ef31dea 100644
--- a/layout/style/ServoBindingList.h
+++ b/layout/style/ServoBindingList.h
@@ -163,6 +163,9 @@ SERVO_BINDING_FUNC(Servo_StyleSet_HasStateDependency, bool,
                    RawServoStyleSetBorrowed set,
                    RawGeckoElementBorrowed element,
                    uint64_t state)
+SERVO_BINDING_FUNC(Servo_StyleSet_HasDocumentStateDependency, bool,
+                   RawServoStyleSetBorrowed set,
+                   uint64_t state)
 
 // CSSRuleList
 SERVO_BINDING_FUNC(Servo_CssRules_ListTypes, void,
diff --git a/layout/style/ServoStyleSet.cpp b/layout/style/ServoStyleSet.cpp
index 291aae4096e8..504f6dbec232 100644
--- a/layout/style/ServoStyleSet.cpp
+++ b/layout/style/ServoStyleSet.cpp
@@ -1603,6 +1603,13 @@ ServoStyleSet::HasStateDependency(const Element& aElement,
       mRawSet.get(), &aElement, aState.ServoValue());
 }
 
+bool
+ServoStyleSet::HasDocumentStateDependency(EventStates aState) const
+{
+  return Servo_StyleSet_HasDocumentStateDependency(
+      mRawSet.get(), aState.ServoValue());
+}
+
 already_AddRefed<ServoStyleContext>
 ServoStyleSet::ReparentStyleContext(ServoStyleContext* aStyleContext,
                                     ServoStyleContext* aNewParent,
diff --git a/layout/style/ServoStyleSet.h b/layout/style/ServoStyleSet.h
index 26380fa779b1..a226a698baf0 100644
--- a/layout/style/ServoStyleSet.h
+++ b/layout/style/ServoStyleSet.h
@@ -486,6 +486,12 @@ public:
   bool HasStateDependency(const dom::Element& aElement,
                           EventStates aState) const;
 
+  /**
+   * Returns true if a change in document state might require us to restyle the
+   * document.
+   */
+  bool HasDocumentStateDependency(EventStates aState) const;
+
   /**
    * Get a new style context that uses the same rules as the given style context
    * but has a different parent.