Merge "Stops ImageWallpaper Thread when phone is idle" into sc-dev

packages/SystemUI/src/com/android/systemui/ImageWallpaper.java

@@ -55,7 +55,7 @@ public class ImageWallpaper extends WallpaperService {
     private static final String TAG = ImageWallpaper.class.getSimpleName();
     // We delayed destroy render context that subsequent render requests have chance to cancel it.
     // This is to avoid destroying then recreating render context in a very short time.
-    private static final int DELAY_FINISH_RENDERING = 3000;
+    private static final int DELAY_FINISH_RENDERING = 1000;
     private static final @android.annotation.NonNull RectF LOCAL_COLOR_BOUNDS =
             new RectF(0, 0, 1, 1);
     private static final boolean DEBUG = false;
@@ -107,12 +107,14 @@ public class ImageWallpaper extends WallpaperService {
         private ImageWallpaperRenderer mRenderer;
         private EglHelper mEglHelper;
         private final Runnable mFinishRenderingTask = this::finishRendering;
+        private final Runnable mInitChoreographerTask = this::initChoreographerInternal;
         private int mWidth = 1;
         private int mHeight = 1;
         private int mImgWidth = 1;
         private int mImgHeight = 1;
         private volatile float mDozeAmount;
         private volatile boolean mNewDozeValue = false;
+        private volatile boolean mShouldScheduleFrame = false;
 
         GLEngine() {
         }
@@ -137,10 +139,7 @@ public class ImageWallpaper extends WallpaperService {
             mWidth = window.width();
             mMiniBitmap = null;
             if (mWorker != null && mWorker.getThreadHandler() != null) {
-                mWorker.getThreadHandler().post(() -> {
+                mWorker.getThreadHandler().post(this::updateMiniBitmap);
-                    updateMiniBitmap();
-                    Choreographer.getInstance().postFrameCallback(GLEngine.this);
-                });
             }
 
             mDozeAmount = mStatusBarStateController.getDozeAmount();
@@ -222,15 +221,16 @@ public class ImageWallpaper extends WallpaperService {
         @Override
         public void onDestroy() {
             mMiniBitmap = null;
+
+            mStatusBarStateController.removeCallback(this);
+
             mWorker.getThreadHandler().post(() -> {
-                Choreographer.getInstance().removeFrameCallback(this);
+                finishChoreographerInternal();
                 mRenderer.finish();
                 mRenderer = null;
                 mEglHelper.finish();
                 mEglHelper = null;
             });
-
-            mStatusBarStateController.removeCallback(this);
         }
 
         @Override
@@ -345,6 +345,8 @@ public class ImageWallpaper extends WallpaperService {
 
         @Override
         public void onDozeAmountChanged(float linear, float eased) {
+            initChoreographer();
+
             mDozeAmount = linear;
             mNewDozeValue = true;
         }
@@ -355,8 +357,10 @@ public class ImageWallpaper extends WallpaperService {
             postRender();
         }
 
+        /**
+         * Important: this method should only be invoked from the ImageWallpaper (worker) Thread.
+         */
         public void preRender() {
-            // This method should only be invoked from worker thread.
             Trace.beginSection("ImageWallpaper#preRender");
             preRenderInternal();
             Trace.endSection();
@@ -391,8 +395,10 @@ public class ImageWallpaper extends WallpaperService {
             }
         }
 
+        /**
+         * Important: this method should only be invoked from the ImageWallpaper (worker) Thread.
+         */
         public void requestRender() {
-            // This method should only be invoked from worker thread.
             Trace.beginSection("ImageWallpaper#requestRender");
             requestRenderInternal();
             Trace.endSection();
@@ -416,8 +422,10 @@ public class ImageWallpaper extends WallpaperService {
             }
         }
 
+        /**
+         * Important: this method should only be invoked from the ImageWallpaper (worker) Thread.
+         */
         public void postRender() {
-            // This method should only be invoked from worker thread.
             Trace.beginSection("ImageWallpaper#postRender");
             scheduleFinishRendering();
             Trace.endSection();
@@ -436,6 +444,7 @@ public class ImageWallpaper extends WallpaperService {
 
         private void finishRendering() {
             Trace.beginSection("ImageWallpaper#finishRendering");
+            finishChoreographerInternal();
             if (mEglHelper != null) {
                 mEglHelper.destroyEglSurface();
                 mEglHelper.destroyEglContext();
@@ -443,6 +452,35 @@ public class ImageWallpaper extends WallpaperService {
             Trace.endSection();
         }
 
+        private void initChoreographer() {
+            if (!mWorker.getThreadHandler().hasCallbacks(mInitChoreographerTask)
+                    && !mShouldScheduleFrame) {
+                mWorker.getThreadHandler().post(mInitChoreographerTask);
+            }
+        }
+
+        /**
+         * Subscribes the engine to listen to Choreographer frame events.
+         * Important: this method should only be invoked from the ImageWallpaper (worker) Thread.
+         */
+        private void initChoreographerInternal() {
+            if (!mShouldScheduleFrame) {
+                // Prepare EGL Context and Surface
+                preRender();
+                mShouldScheduleFrame = true;
+                Choreographer.getInstance().postFrameCallback(GLEngine.this);
+            }
+        }
+
+        /**
+         * Unsubscribe the engine from listening to Choreographer frame events.
+         * Important: this method should only be invoked from the ImageWallpaper (worker) Thread.
+         */
+        private void finishChoreographerInternal() {
+            mShouldScheduleFrame = false;
+            Choreographer.getInstance().removeFrameCallback(GLEngine.this);
+        }
+
         private boolean needSupportWideColorGamut() {
             return mRenderer.isWcgContent();
         }
@@ -469,7 +507,10 @@ public class ImageWallpaper extends WallpaperService {
                 drawFrame();
                 mNewDozeValue = false;
             }
-            Choreographer.getInstance().postFrameCallback(this);
+
+            if (mShouldScheduleFrame) {
+                Choreographer.getInstance().postFrameCallback(this);
+            }
         }
     }
 }