1 // Copyright (C) 2016 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 #pragma once
15 
16 #include "render-utils/IOStream.h"
17 #include "RenderChannelImpl.h"
18 
19 #include <memory>
20 
21 namespace gfxstream {
22 
23 // An IOStream instance that can be used by the host RenderThread to
24 // wrap a RenderChannelImpl channel.
25 class ChannelStream final : public IOStream {
26 public:
27     ChannelStream(RenderChannelImpl* channel, size_t bufSize);
28 
29     void forceStop();
30     int writeFully(const void* buf, size_t len) override;
31     const unsigned char *readFully( void *buf, size_t len) override;
32 
33 protected:
34     virtual void* allocBuffer(size_t minSize) override final;
35     virtual int commitBuffer(size_t size) override final;
36     virtual const unsigned char* readRaw(void* buf, size_t* inout_len)
37             override final;
38     virtual void* getDmaForReading(uint64_t guest_paddr) override final;
39     virtual void unlockDma(uint64_t guest_paddr) override final;
40 
41     void onSave(android::base::Stream* stream) override;
42     unsigned char* onLoad(android::base::Stream* stream) override;
43 
44 private:
45     RenderChannelImpl* mChannel;
46     RenderChannel::Buffer mWriteBuffer;
47     RenderChannel::Buffer mReadBuffer;
48     size_t mReadBufferLeft = 0;
49 };
50 
51 }  // namespace gfxstream
52