1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.wm.shell.common;
18 
19 import android.view.SurfaceControl;
20 import android.view.SurfaceSession;
21 
22 /**
23  * Helpers for handling surface.
24  */
25 public class SurfaceUtils {
26     /** Creates a dim layer above host surface. */
makeDimLayer(SurfaceControl.Transaction t, SurfaceControl host, String name, SurfaceSession surfaceSession)27     public static SurfaceControl makeDimLayer(SurfaceControl.Transaction t, SurfaceControl host,
28             String name, SurfaceSession surfaceSession) {
29         final SurfaceControl dimLayer = makeColorLayer(host, name, surfaceSession);
30         t.setLayer(dimLayer, Integer.MAX_VALUE).setColor(dimLayer, new float[]{0f, 0f, 0f});
31         return dimLayer;
32     }
33 
34     /** Creates a color layer for host surface. */
makeColorLayer(SurfaceControl host, String name, SurfaceSession surfaceSession)35     public static SurfaceControl makeColorLayer(SurfaceControl host, String name,
36             SurfaceSession surfaceSession) {
37         return new SurfaceControl.Builder(surfaceSession)
38                 .setParent(host)
39                 .setColorLayer()
40                 .setName(name)
41                 .setCallsite("SurfaceUtils.makeColorLayer")
42                 .build();
43     }
44 }
45