From 8000d425821f2017a1c97f77e6ee97c0627b1b86 Mon Sep 17 00:00:00 2001
From: Bobby Holley <bobbyholley@gmail.com>
Date: Tue, 19 Sep 2017 21:43:31 -0700
Subject: [PATCH] Bug 1401317 - Disable lazy pseudo caching when the
 originating element's primary style was reused via the rule node. r=emilio

MozReview-Commit-ID: IkBa39E1bR1
---
 components/style/gecko/generated/bindings.rs |  5 +++++
 ports/geckolib/glue.rs                       | 13 ++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/components/style/gecko/generated/bindings.rs b/components/style/gecko/generated/bindings.rs
index 3487ec2f534..59c97a0658e 100644
--- a/components/style/gecko/generated/bindings.rs
+++ b/components/style/gecko/generated/bindings.rs
@@ -1936,6 +1936,11 @@ extern "C" {
     pub fn Servo_Element_IsDisplayNone(element: RawGeckoElementBorrowed)
      -> bool;
 }
+extern "C" {
+    pub fn Servo_Element_IsPrimaryStyleReusedViaRuleNode(element:
+                                                             RawGeckoElementBorrowed)
+     -> bool;
+}
 extern "C" {
     pub fn Servo_StyleSheet_FromUTF8Bytes(loader: *mut Loader,
                                           gecko_stylesheet:
diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index eda8d6f8b4c..0211a0a0387 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -18,7 +18,7 @@ use std::ptr;
 use style::applicable_declarations::ApplicableDeclarationBlock;
 use style::context::{CascadeInputs, QuirksMode, SharedStyleContext, StyleContext};
 use style::context::ThreadLocalStyleContext;
-use style::data::ElementStyles;
+use style::data::{ElementStyles, self};
 use style::dom::{ShowSubtreeData, TElement, TNode};
 use style::driver;
 use style::element_state::ElementState;
@@ -836,13 +836,20 @@ pub extern "C" fn Servo_Element_GetPseudoComputedValues(element: RawGeckoElement
 }
 
 #[no_mangle]
-pub extern "C" fn Servo_Element_IsDisplayNone(element: RawGeckoElementBorrowed) -> bool
-{
+pub extern "C" fn Servo_Element_IsDisplayNone(element: RawGeckoElementBorrowed) -> bool {
     let element = GeckoElement(element);
     let data = element.borrow_data().expect("Invoking Servo_Element_IsDisplayNone on unstyled element");
     data.styles.is_display_none()
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_Element_IsPrimaryStyleReusedViaRuleNode(element: RawGeckoElementBorrowed) -> bool {
+    let element = GeckoElement(element);
+    let data = element.borrow_data()
+                      .expect("Invoking Servo_Element_IsPrimaryStyleReusedViaRuleNode on unstyled element");
+    data.flags.contains(data::PRIMARY_STYLE_REUSED_VIA_RULE_NODE)
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_StyleSheet_Empty(mode: SheetParsingMode) -> RawServoStyleSheetContentsStrong {
     let global_style_data = &*GLOBAL_STYLE_DATA;