Bug 1319985 - Expose ChangeCallback in gfxPrefs. r=milan

MozReview-Commit-ID: GiLq4OwmzYs

gfx/thebes/gfxPrefs.cpp

@@ -52,15 +52,15 @@ void
 gfxPrefs::Init()
 {
   // Set up Moz2D prefs.
-  mPrefGfxLoggingLevel.SetChangeCallback([]() -> void {
-    mozilla::gfx::LoggingPrefs::sGfxLogLevel = GetSingleton().mPrefGfxLoggingLevel.GetLiveValue();
+  SetGfxLoggingLevelChangeCallback([](const GfxPrefValue& aValue) -> void {
+    mozilla::gfx::LoggingPrefs::sGfxLogLevel = aValue.get_int32_t();
   });
 }
 
 gfxPrefs::~gfxPrefs()
 {
   gfxPrefs::AssertMainThread();
-  mPrefGfxLoggingLevel.SetChangeCallback(nullptr);
+  SetGfxLoggingLevelChangeCallback(nullptr);
   delete sGfxPrefList;
   sGfxPrefList = nullptr;
 }
@@ -87,7 +87,9 @@ void
 gfxPrefs::Pref::FireChangeCallback()
 {
   if (mChangeCallback) {
-    mChangeCallback();
+    GfxPrefValue value;
+    GetLiveValue(&value);
+    mChangeCallback(value);
   }
 }
 

gfx/thebes/gfxPrefs.h

@@ -70,6 +70,9 @@ static void Set##Name(Type aVal) { MOZ_ASSERT(SingletonExists());             \
     GetSingleton().mPref##Name.Set(UpdatePolicy::Update, Get##Name##PrefName(), aVal); } \
 static const char* Get##Name##PrefName() { return Prefname; }                 \
 static Type Get##Name##PrefDefault() { return Default; }                      \
+static void Set##Name##ChangeCallback(Pref::ChangeCallback aCallback) {       \
+    MOZ_ASSERT(SingletonExists());                                            \
+    GetSingleton().mPref##Name.SetChangeCallback(aCallback); }                \
 private:                                                                      \
 PrefTemplate<UpdatePolicy::Update, Type, Get##Name##PrefDefault, Get##Name##PrefName> mPref##Name
 
@@ -105,7 +108,7 @@ public:
     size_t Index() const { return mIndex; }
     void OnChange();
 
-    typedef void (*ChangeCallback)();
+    typedef void (*ChangeCallback)(const GfxPrefValue&);
     void SetChangeCallback(ChangeCallback aCallback);
 
     virtual const char* Name() const = 0;