Bug 1729894 - Now that WR is everyhwere, enable backdrop-filter on early-beta / nightly. r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D125054

devtools/shared/css/generated/properties-db.js

@@ -3401,6 +3401,31 @@ exports.CSS_PROPERTIES = {
       "unset"
     ]
   },
+  "backdrop-filter": {
+    "isInherited": false,
+    "subproperties": [
+      "backdrop-filter"
+    ],
+    "supports": [],
+    "values": [
+      "blur",
+      "brightness",
+      "contrast",
+      "drop-shadow",
+      "grayscale",
+      "hue-rotate",
+      "inherit",
+      "initial",
+      "invert",
+      "none",
+      "opacity",
+      "revert",
+      "saturate",
+      "sepia",
+      "unset",
+      "url"
+    ]
+  },
   "backface-visibility": {
     "isInherited": false,
     "subproperties": [

gfx/thebes/gfxPlatform.cpp

@@ -2518,11 +2518,6 @@ void gfxPlatform::InitWebRenderConfig() {
   bool prefEnabled = WebRenderPrefEnabled();
   bool envvarEnabled = WebRenderEnvvarEnabled();
 
-  // This would ideally be in the nsCSSProps code
-  // but nsCSSProps is initialized before gfxPlatform
-  // so it has to be done here.
-  gfxVars::AddReceiver(&nsCSSProps::GfxVarReceiver());
-
   // WR? WR+   => means WR was enabled via gfx.webrender.all.qualified on
   //              qualified hardware
   // WR! WR+   => means WR was enabled via gfx.webrender.{all,enabled} or
@@ -2537,9 +2532,6 @@ void gfxPlatform::InitWebRenderConfig() {
     // later in this function. For other processes we still want to report
     // the state of the feature for crash reports.
     if (gfxVars::UseWebRender()) {
-      // gfxVars doesn't notify receivers when initialized on content processes
-      // we need to explicitly recompute backdrop-filter's enabled state here.
-      nsCSSProps::RecomputeEnabledState("layout.css.backdrop-filter.enabled");
       reporter.SetSuccessful();
     }
     return;

layout/style/nsCSSProps.cpp

@@ -76,10 +76,6 @@ void nsCSSProps::RecomputeEnabledState(const char* aPref, void*) {
 #else
       gPropertyEnabled[pref->mPropID] = Preferences::GetBool(pref->mPref);
 #endif
-      if (pref->mPropID == eCSSProperty_backdrop_filter) {
-        gPropertyEnabled[pref->mPropID] &=
-            gfx::gfxVars::GetUseWebRenderOrDefault();
-      }
     }
   }
   MOZ_ASSERT(foundPref);
@@ -216,40 +212,4 @@ bool nsCSSProps::gPropertyEnabled[eCSSProperty_COUNT_with_aliases] = {
 #undef IS_ENABLED_BY_DEFAULT
 };
 
-/**
- * A singleton class to register as a receiver for gfxVars.
- * Updates the state of backdrop-filter's pref if the gfx
- * WebRender var changes state.
- */
-class nsCSSPropsGfxVarReceiver final : public gfx::gfxVarReceiver {
-  constexpr nsCSSPropsGfxVarReceiver() = default;
-
-  // WebRender's last known enabled state.
-  static bool sLastKnownUseWebRender;
-  static nsCSSPropsGfxVarReceiver sInstance;
-
- public:
-  static gfx::gfxVarReceiver& GetInstance() { return sInstance; }
-
-  void OnVarChanged(const gfx::GfxVarUpdate&) override {
-    bool enabled = gfxVars::UseWebRender();
-    if (sLastKnownUseWebRender != enabled) {
-      sLastKnownUseWebRender = enabled;
-      nsCSSProps::RecomputeEnabledState("layout.css.backdrop-filter.enabled");
-    }
-  }
-};
-
-/* static */
-nsCSSPropsGfxVarReceiver nsCSSPropsGfxVarReceiver::sInstance =
-    nsCSSPropsGfxVarReceiver();
-
-/* static */
-bool nsCSSPropsGfxVarReceiver::sLastKnownUseWebRender = false;
-
-/* static */
-gfx::gfxVarReceiver& nsCSSProps::GfxVarReceiver() {
-  return nsCSSPropsGfxVarReceiver::GetInstance();
-}
-
 #include "nsCSSPropsGenerated.inc"

modules/libpref/init/StaticPrefList.yaml

@@ -6856,7 +6856,7 @@
 # Is support for CSS backdrop-filter enabled?
 - name: layout.css.backdrop-filter.enabled
   type: bool
-  value: false
+  value: @IS_EARLY_BETA_OR_EARLIER@
   mirror: always
 
 # Should stray control characters be rendered visibly?