From 6470c60273d855c5ccf9aedbae0b9183f2c06c00 Mon Sep 17 00:00:00 2001
From: Tracy Zhou <tracyzhou@google.com>
Date: Sun, 8 Mar 2020 17:21:38 -0700
Subject: [PATCH] Support scaling with SurfaceControl when using
 WindowlessWindow APIs

Demo: https://drive.google.com/open?id=1wQ8dT5bfTxSh-NRQpNBwTCkKOtOOUMPj

Bug: 150224413
Test: Manual test on both universal smartspace and wallpaper preview
Change-Id: I604e5a43727035cbeb36f02681fc317fd356268a
---
 .../system/SurfaceViewRequestReceiver.java    | 31 +++++++++++++++++--
 .../system/SurfaceViewRequestUtils.java       |  4 +--
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestReceiver.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestReceiver.java
index 7cfa289595e3b..d33c653f2cb71 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestReceiver.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestReceiver.java
@@ -20,6 +20,7 @@ import android.content.Context;
 import android.graphics.PixelFormat;
 import android.os.Bundle;
 import android.os.IBinder;
+import android.util.Size;
 import android.view.SurfaceControl;
 import android.view.SurfaceControlViewHost;
 import android.view.View;
@@ -43,13 +44,27 @@ public class SurfaceViewRequestReceiver {
         mOpacity = opacity;
     }
 
-    /** Called whenever a surface view request is received. */
+    /** See {@link #onReceive(Context, Bundle, View, Size)}. */
     public void onReceive(Context context, Bundle bundle, View view) {
+        onReceive(context, bundle, view, null);
+    }
+
+    /**
+     * Called whenever a surface view request is received.
+     * @param view     the view rendering content, on the receiver end of the surface request.
+     * @param viewSize when {@param viewSize} is not specified, we will use the surface control size
+     *                 to attach the view to the window.
+     */
+    public void onReceive(Context context, Bundle bundle, View view, Size viewSize) {
         if (mSurfaceControlViewHost != null) {
             mSurfaceControlViewHost.die();
         }
         SurfaceControl surfaceControl = SurfaceViewRequestUtils.getSurfaceControl(bundle);
         if (surfaceControl != null) {
+            if (viewSize == null) {
+                viewSize = new Size(surfaceControl.getWidth(), surfaceControl.getHeight());
+            }
+
             IBinder hostToken = SurfaceViewRequestUtils.getHostToken(bundle);
 
             WindowlessWindowManager windowlessWindowManager =
@@ -59,12 +74,22 @@ public class SurfaceViewRequestReceiver {
                     context.getDisplayNoVerify(), windowlessWindowManager);
             WindowManager.LayoutParams layoutParams =
                     new WindowManager.LayoutParams(
-                            surfaceControl.getWidth(),
-                            surfaceControl.getHeight(),
+                            viewSize.getWidth(),
+                            viewSize.getHeight(),
                             WindowManager.LayoutParams.TYPE_APPLICATION,
                             WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
                             mOpacity);
 
+            // This aspect scales the view to fit in the surface and centers it
+            final float scale = Math.min(surfaceControl.getWidth() / (float) viewSize.getWidth(),
+                    surfaceControl.getHeight() / (float) viewSize.getHeight());
+            view.setScaleX(scale);
+            view.setScaleY(scale);
+            view.setPivotX(0);
+            view.setPivotY(0);
+            view.setTranslationX((surfaceControl.getWidth() - scale * viewSize.getWidth()) / 2);
+            view.setTranslationY((surfaceControl.getHeight() - scale * viewSize.getHeight()) / 2);
+
             mSurfaceControlViewHost.addView(view, layoutParams);
         }
     }
diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestUtils.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestUtils.java
index 0cbd541cbc8d3..4409276f8c277 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestUtils.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/SurfaceViewRequestUtils.java
@@ -36,7 +36,7 @@ public class SurfaceViewRequestUtils {
     }
 
     /**
-     * Retrieves the SurfaceControl from an Intent created by
+     * Retrieves the SurfaceControl from a bundle created by
      * {@link #createSurfaceBundle(SurfaceView)}.
      **/
     public static SurfaceControl getSurfaceControl(Bundle bundle) {
@@ -44,7 +44,7 @@ public class SurfaceViewRequestUtils {
     }
 
     /**
-     * Retrieves the input token from an Intent created by
+     * Retrieves the input token from a bundle created by
      * {@link #createSurfaceBundle(SurfaceView)}.
      **/
     public static @Nullable IBinder getHostToken(Bundle bundle) {