Refactor GlViewGroup to ViewRenderer

GlViewGroup doesn't work properly as an actual ViewGroup. For example,
it doesn't support addition of child views after instantiation. This
change turns the class into a renderer, which is also more consistent
with other classes in the package.

PiperOrigin-RevId: 275322295

extensions/gvr/src/main/java/com/google/android/exoplayer2/ext/gvr/GvrPlayerActivity.java

@@ -21,8 +21,10 @@ import android.graphics.SurfaceTexture;
 import android.opengl.Matrix;
 import android.os.Bundle;
 import android.view.ContextThemeWrapper;
+import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.Surface;
+import android.view.View;
 import androidx.annotation.BinderThread;
 import androidx.annotation.CallSuper;
 import androidx.annotation.Nullable;
@@ -30,9 +32,9 @@ import androidx.annotation.UiThread;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.ui.PlayerControlView;
-import com.google.android.exoplayer2.ui.spherical.GlViewGroup;
 import com.google.android.exoplayer2.ui.spherical.PointerRenderer;
 import com.google.android.exoplayer2.ui.spherical.SceneRenderer;
+import com.google.android.exoplayer2.ui.spherical.ViewRenderer;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.vr.ndk.base.DaydreamApi;
 import com.google.vr.sdk.base.AndroidCompat;
@@ -71,18 +73,18 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     // If a custom theme isn't specified, the Context's theme is used. For VR Activities, this is
     // the old Android default theme rather than a modern theme. Override this with a custom theme.
     Context theme = new ContextThemeWrapper(this, R.style.ExoVrTheme);
-    GlViewGroup glViewGroup = new GlViewGroup(theme, R.layout.exo_vr_ui);
+    View viewGroup = LayoutInflater.from(theme).inflate(R.layout.exo_vr_ui, /* root= */ null);
 
-    playerControlView = Assertions.checkNotNull(glViewGroup.findViewById(R.id.controller));
+    ViewRenderer viewRenderer = new ViewRenderer(/* context= */ this, gvrView, viewGroup);
+
+    playerControlView = Assertions.checkNotNull(viewGroup.findViewById(R.id.controller));
     playerControlView.setShowVrButton(true);
     playerControlView.setVrButtonListener(v -> exit());
 
     sceneRenderer = new SceneRenderer();
     PointerRenderer pointerRenderer = new PointerRenderer();
-    Renderer renderer = new Renderer(sceneRenderer, pointerRenderer, glViewGroup);
+    Renderer renderer = new Renderer(sceneRenderer, pointerRenderer, viewRenderer);
 
-    // Attach glViewGroup to gvrView in order to properly handle UI events.
-    gvrView.addView(glViewGroup);
     // Standard GvrView configuration
     gvrView.setEGLConfigChooser(
         8, 8, 8, 8, // RGBA bits.
@@ -104,7 +106,7 @@ public abstract class GvrPlayerActivity extends GvrActivity {
         new ControllerManager(/* context= */ this, new ControllerManagerEventListener());
     Controller controller = controllerManager.getController();
     ControllerEventListener controllerEventListener =
-        new ControllerEventListener(controller, pointerRenderer, glViewGroup);
+        new ControllerEventListener(controller, pointerRenderer, viewRenderer);
     controller.setEventListener(controllerEventListener);
   }
 
@@ -231,14 +233,14 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
     private final SceneRenderer sceneRenderer;
     private final PointerRenderer pointerRenderer;
-    private final GlViewGroup glViewGroup;
+    private final ViewRenderer viewRenderer;
     private final float[] viewProjectionMatrix;
 
     public Renderer(
-        SceneRenderer sceneRenderer, PointerRenderer pointerRenderer, GlViewGroup glViewGroup) {
+        SceneRenderer sceneRenderer, PointerRenderer pointerRenderer, ViewRenderer viewRenderer) {
       this.sceneRenderer = sceneRenderer;
       this.pointerRenderer = pointerRenderer;
-      this.glViewGroup = glViewGroup;
+      this.viewRenderer = viewRenderer;
       viewProjectionMatrix = new float[16];
     }
 
@@ -250,8 +252,8 @@ public abstract class GvrPlayerActivity extends GvrActivity {
       Matrix.multiplyMM(
           viewProjectionMatrix, 0, eye.getPerspective(Z_NEAR, Z_FAR), 0, eye.getEyeView(), 0);
       sceneRenderer.drawFrame(viewProjectionMatrix, eye.getType() == Eye.Type.RIGHT);
-      if (glViewGroup.isVisible()) {
-        glViewGroup.getRenderer().draw(viewProjectionMatrix);
+      if (viewRenderer.isVisible()) {
+        viewRenderer.draw(viewProjectionMatrix);
         pointerRenderer.draw(viewProjectionMatrix);
       }
     }
@@ -262,7 +264,7 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     @Override
     public void onSurfaceCreated(EGLConfig config) {
       onSurfaceTextureAvailable(sceneRenderer.init());
-      glViewGroup.getRenderer().init();
+      viewRenderer.init();
       pointerRenderer.init();
     }
 
@@ -271,7 +273,7 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
     @Override
     public void onRendererShutdown() {
-      glViewGroup.getRenderer().shutdown();
+      viewRenderer.shutdown();
       pointerRenderer.shutdown();
       sceneRenderer.shutdown();
     }
@@ -281,16 +283,16 @@ public abstract class GvrPlayerActivity extends GvrActivity {
 
     private final Controller controller;
     private final PointerRenderer pointerRenderer;
-    private final GlViewGroup glViewGroup;
+    private final ViewRenderer viewRenderer;
     private final float[] controllerOrientationMatrix;
     private boolean clickButtonDown;
     private boolean appButtonDown;
 
     public ControllerEventListener(
-        Controller controller, PointerRenderer pointerRenderer, GlViewGroup glViewGroup) {
+        Controller controller, PointerRenderer pointerRenderer, ViewRenderer viewRenderer) {
       this.controller = controller;
       this.pointerRenderer = pointerRenderer;
-      this.glViewGroup = glViewGroup;
+      this.viewRenderer = viewRenderer;
       controllerOrientationMatrix = new float[16];
     }
 
@@ -319,7 +321,7 @@ public abstract class GvrPlayerActivity extends GvrActivity {
     }
 
     private void dispatchClick(int action, float yaw, float pitch) {
-      boolean clickedOnView = glViewGroup.simulateClick(action, yaw, pitch);
+      boolean clickedOnView = viewRenderer.simulateClick(action, yaw, pitch);
       if (action == MotionEvent.ACTION_DOWN && !clickedOnView) {
         togglePlayerControlVisibility();
       }

library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/GlViewGroup.java → library/ui/src/main/java/com/google/android/exoplayer2/ui/spherical/ViewRenderer.java

@@ -21,66 +21,60 @@ import android.graphics.Color;
 import android.graphics.PointF;
 import android.graphics.PorterDuff;
 import android.os.SystemClock;
-import android.view.LayoutInflater;
 import android.view.MotionEvent;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
-import androidx.annotation.AnyThread;
+import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
 import com.google.android.exoplayer2.util.Assertions;
 
-/** This View uses standard Android APIs to render its child Views to a texture. */
-public final class GlViewGroup extends FrameLayout {
+/** Renders a {@link View} on a quad and supports simulated clicks on the view. */
+public final class ViewRenderer {
 
   private final CanvasRenderer canvasRenderer;
+  private final View view;
+  private final InternalFrameLayout frameLayout;
 
   /**
-   * @param context The Context the view is running in, through which it can access the current
-   *     theme, resources, etc.
-   * @param layoutId ID for an XML layout resource to load (e.g., * <code>R.layout.main_page</code>)
+   * @param context A context.
+   * @param parentView The parent view.
+   * @param view The view to render.
    */
-  public GlViewGroup(Context context, int layoutId) {
-    super(context);
+  public ViewRenderer(Context context, ViewGroup parentView, View view) {
     this.canvasRenderer = new CanvasRenderer();
+    this.view = view;
+    // Wrap the view in an internal view that redirects rendering.
+    frameLayout = new InternalFrameLayout(context, view, canvasRenderer);
+    canvasRenderer.setSize(frameLayout.getMeasuredWidth(), frameLayout.getMeasuredHeight());
+    // The internal view must be added to the parent to ensure proper delivery of UI events.
+    parentView.addView(frameLayout);
+  }
+
+  /** Finishes constructing this object on the GL Thread. */
+  public void init() {
+    canvasRenderer.init();
+  }
 
-    LayoutInflater.from(context).inflate(layoutId, this);
+  /**
+   * Renders the view as a quad.
+   *
+   * @param viewProjectionMatrix Array of floats containing the quad's 4x4 perspective matrix in the
+   *     {@link android.opengl.Matrix} format.
+   */
+  public void draw(float[] viewProjectionMatrix) {
+    canvasRenderer.draw(viewProjectionMatrix);
+  }
 
-    measure(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
-    int width = getMeasuredWidth();
-    int height = getMeasuredHeight();
-    Assertions.checkState(width > 0 && height > 0);
-    canvasRenderer.setSize(width, height);
-    setLayoutParams(new FrameLayout.LayoutParams(width, height));
+  /** Frees GL resources. */
+  public void shutdown() {
+    canvasRenderer.shutdown();
   }
 
   /** Returns whether the view is currently visible. */
   @UiThread
   public boolean isVisible() {
-    int childCount = getChildCount();
-    for (int i = 0; i < childCount; i++) {
-      if (getChildAt(i).getVisibility() == VISIBLE) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  @Override
-  public void dispatchDraw(Canvas notUsed) {
-    Canvas glCanvas = canvasRenderer.lockCanvas();
-    if (glCanvas == null) {
-      // This happens if Android tries to draw this View before GL initialization completes. We need
-      // to retry until the draw call happens after GL invalidation.
-      postInvalidate();
-      return;
-    }
-
-    // Clear the canvas first.
-    glCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
-    // Have Android render the child views.
-    super.dispatchDraw(glCanvas);
-    // Commit the changes.
-    canvasRenderer.unlockCanvasAndPost(glCanvas);
+    return view.getVisibility() == View.VISIBLE;
   }
 
   /**
@@ -97,18 +91,47 @@ public final class GlViewGroup extends FrameLayout {
     if (!isVisible()) {
       return false;
     }
-    PointF point = canvasRenderer.translateClick(yaw, pitch);
+    @Nullable PointF point = canvasRenderer.translateClick(yaw, pitch);
     if (point == null) {
       return false;
     }
     long now = SystemClock.uptimeMillis();
     MotionEvent event = MotionEvent.obtain(now, now, action, point.x, point.y, /* metaState= */ 1);
-    dispatchTouchEvent(event);
+    frameLayout.dispatchTouchEvent(event);
     return true;
   }
 
-  @AnyThread
-  public CanvasRenderer getRenderer() {
-    return canvasRenderer;
+  private static final class InternalFrameLayout extends FrameLayout {
+
+    private final CanvasRenderer canvasRenderer;
+
+    public InternalFrameLayout(Context context, View wrappedView, CanvasRenderer canvasRenderer) {
+      super(context);
+      this.canvasRenderer = canvasRenderer;
+      addView(wrappedView);
+      measure(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
+      int width = getMeasuredWidth();
+      int height = getMeasuredHeight();
+      Assertions.checkState(width > 0 && height > 0);
+      setLayoutParams(new FrameLayout.LayoutParams(width, height));
+    }
+
+    @Override
+    public void dispatchDraw(Canvas notUsed) {
+      @Nullable Canvas glCanvas = canvasRenderer.lockCanvas();
+      if (glCanvas == null) {
+        // This happens if Android tries to draw this View before GL initialization completes. We
+        // need to retry until the draw call happens after GL invalidation.
+        postInvalidate();
+        return;
+      }
+
+      // Clear the canvas first.
+      glCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
+      // Have Android render the child views.
+      super.dispatchDraw(glCanvas);
+      // Commit the changes.
+      canvasRenderer.unlockCanvasAndPost(glCanvas);
+    }
   }
 }