1 // Copyright (C) 2022 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #pragma once
16 
17 #include <stdint.h>
18 
19 #include "aemu/base/synchronization/Lock.h"
20 
21 namespace gfxstream {
22 
23 class DisplaySurface;
24 class DisplaySurfaceUser;
25 
26 class DisplaySurfaceUser {
27   public:
28     virtual ~DisplaySurfaceUser();
29 
30   public:
31     void bindToSurface(DisplaySurface* surface);
32 
33     void unbindFromSurface();
34 
35   protected:
36     virtual void bindToSurfaceImpl(DisplaySurface* surface) = 0;
37 
38     virtual void surfaceUpdated(DisplaySurface* surface) = 0;
39 
40     virtual void unbindFromSurfaceImpl() = 0;
41 
getBoundSurface()42     const DisplaySurface* getBoundSurface() const { return mBoundSurface; }
43 
44    protected:
45     android::base::Lock mMutex;
46 
47    private:
48     friend class DisplaySurface;
49     DisplaySurface* mBoundSurface = nullptr;
50 };
51 
52 }  // namespace gfxstream
53