VectorDrawable native rendering - Step 4 of MANY

This CL runs VectorDrawable animation on RenderThread. The changes in this CL
include:
- Convert all the animators in AnimatorSet for AVD into a set of RenderNodeAnimators.
- Hook up the new animators with RenderThread
- Add drawOp in RecordingCanvas for drawing VD so that during the animation
  on RenderThread, all the property changes on VD can be reflected on the screen.

TODO:
- Implement reverse and reset for AVD.

Change-Id: I2df1d754f2db0ad098d9c15dde4bb2bdfafc2315

1 files changed, 25 insertions, 1 deletions

diff --git a/libs/hwui/Animator.h b/libs/hwui/Animator.h
index aea95bfc1c0e..2c9c9c3fe0f9 100644
--- a/libs/hwui/Animator.h
+++ b/libs/hwui/Animator.h
@@ -59,7 +59,13 @@ public:
         mMayRunAsync = mayRunAsync;
     }
     bool mayRunAsync() { return mMayRunAsync; }
-    ANDROID_API void start() { mStagingPlayState = PlayState::Running; onStagingPlayStateChanged(); }
+    ANDROID_API void start() {
+        if (mStagingPlayState == PlayState::NotStarted) {
+            mStagingPlayState = PlayState::Running;
+        } else {
+            mStagingPlayState = PlayState::Restarted;
+        }
+        onStagingPlayStateChanged(); }
     ANDROID_API void end() { mStagingPlayState = PlayState::Finished; onStagingPlayStateChanged(); }
 
     void attach(RenderNode* target);
@@ -77,10 +83,27 @@ public:
     void forceEndNow(AnimationContext& context);
 
 protected:
+    // PlayState is used by mStagingPlayState and mPlayState to track the state initiated from UI
+    // thread and Render Thread animation state, respectively.
+    // From the UI thread, mStagingPlayState transition looks like
+    // NotStarted -> Running -> Finished
+    //                ^            |
+    //                |            |
+    //            Restarted <------
+    // Note: For mStagingState, the Finished state (optional) is only set when the animation is
+    // terminated by user.
+    //
+    // On Render Thread, mPlayState transition:
+    // NotStart -> Running -> Finished
+    //                ^            |
+    //                |            |
+    //                -------------
+
     enum class PlayState {
         NotStarted,
         Running,
         Finished,
+        Restarted,
     };
 
     BaseRenderNodeAnimator(float finalValue);
@@ -93,6 +116,7 @@ protected:
     void callOnFinishedListener(AnimationContext& context);
 
     virtual void onStagingPlayStateChanged() {}
+    virtual void onPlayTimeChanged(nsecs_t playTime) {}
 
     RenderNode* mTarget;