Bug 768440 Part 2: Animate CSS Transitions on the compositor r=roc,dbaron

layout/base/nsLayoutUtils.cpp

@@ -83,6 +83,8 @@
 #endif
 
 #include "sampler.h"
+#include "nsAnimationManager.h"
+#include "nsTransitionManager.h"
 
 using namespace mozilla;
 using namespace mozilla::layers;
@@ -113,6 +115,32 @@ static ContentMap& GetContentMap() {
   return *sContentMap;
 }
 
+bool
+nsLayoutUtils::HasAnimationsForCompositor(nsIContent* aContent,
+                                          nsCSSProperty aProperty)
+{
+  if (!aContent->MayHaveAnimations())
+    return false;
+  ElementAnimations* animations =
+    static_cast<ElementAnimations*>(aContent->GetProperty(nsGkAtoms::animationsProperty));
+  if (animations) {
+    bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
+    if (propertyMatches && animations->CanPerformOnCompositorThread()) {
+      return true;
+    }
+  }
+
+  ElementTransitions* transitions =
+    static_cast<ElementTransitions*>(aContent->GetProperty(nsGkAtoms::transitionsProperty));
+  if (transitions) {
+    bool propertyMatches = transitions->HasTransitionOfProperty(aProperty);
+    if (propertyMatches && transitions->CanPerformOnCompositorThread()) {
+      return true;
+    }
+  }
+
+  return false;
+}
 
 bool
 nsLayoutUtils::Are3DTransformsEnabled()