Bug 1619040 - Add a new WebRenderData specific for APZ. r=kats

AnimationInfo has a bunch of member variables that are not necessary for APZ.

Differential Revision: https://phabricator.services.mozilla.com/D64855

--HG--
extra : moz-landing-system : lando

gfx/layers/wr/WebRenderUserData.cpp

@@ -6,6 +6,7 @@
 
 #include "WebRenderUserData.h"
 
+#include "mozilla/layers/AnimationHelper.h"
 #include "mozilla/layers/CompositorBridgeChild.h"
 #include "mozilla/layers/ImageClient.h"
 #include "mozilla/layers/WebRenderBridgeChild.h"
@@ -336,6 +337,11 @@ WebRenderImageData* WebRenderFallbackData::PaintIntoImage() {
   return mImageData.get();
 }
 
+WebRenderAPZAnimationData::WebRenderAPZAnimationData(
+    RenderRootStateManager* aManager, nsDisplayItem* aItem)
+    : WebRenderUserData(aManager, aItem),
+      mAnimationId(AnimationHelper::GetNextCompositorAnimationsId()) {}
+
 WebRenderAnimationData::WebRenderAnimationData(RenderRootStateManager* aManager,
                                                nsDisplayItem* aItem)
     : WebRenderUserData(aManager, aItem) {}

gfx/layers/wr/WebRenderUserData.h

@@ -78,6 +78,7 @@ class WebRenderUserData {
   enum class UserDataType {
     eImage,
     eFallback,
+    eAPZAnimation,
     eAnimation,
     eCanvas,
     eRemote,
@@ -220,6 +221,20 @@ class WebRenderFallbackData : public WebRenderUserData {
   bool mInvalid;
 };
 
+class WebRenderAPZAnimationData : public WebRenderUserData {
+ public:
+  WebRenderAPZAnimationData(RenderRootStateManager* aManager,
+                            nsDisplayItem* aItem);
+  virtual ~WebRenderAPZAnimationData() = default;
+
+  UserDataType GetType() override { return UserDataType::eAPZAnimation; }
+  static UserDataType Type() { return UserDataType::eAPZAnimation; }
+  uint64_t GetAnimationId() { return mAnimationId; }
+
+ private:
+  uint64_t mAnimationId;
+};
+
 class WebRenderAnimationData : public WebRenderUserData {
  public:
   WebRenderAnimationData(RenderRootStateManager* aManager,

layout/painting/nsDisplayList.cpp

@@ -6942,13 +6942,11 @@ bool nsDisplayOwnLayer::CreateWebRenderCommands(
     // APZ is enabled and this is a scroll thumb or zooming layer, so we need
     // to create and set an animation id. That way APZ can adjust the position/
     // zoom of this content asynchronously as needed.
-    RefPtr<WebRenderAnimationData> animationData =
+    RefPtr<WebRenderAPZAnimationData> animationData =
         aManager->CommandBuilder()
-            .CreateOrRecycleWebRenderUserData<WebRenderAnimationData>(
+            .CreateOrRecycleWebRenderUserData<WebRenderAPZAnimationData>(
                 this, aBuilder.GetRenderRoot());
-    AnimationInfo& animationInfo = animationData->GetAnimationInfo();
-    animationInfo.EnsureAnimationsId();
-    mWrAnimationId = animationInfo.GetCompositorAnimationsId();
+    mWrAnimationId = animationData->GetAnimationId();
 
     prop.emplace();
     prop->id = mWrAnimationId;