1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace gfxstream {
class ColorBuffer;
// This class implements async readback of ColorBuffers on both the FrameBuffer
// posting thread and a separate worker thread.
class ReadbackWorker {
public:
virtual ~ReadbackWorker() = default;
virtual void init() = 0;
// Enables readback of the given display.
virtual void initReadbackForDisplay(uint32_t displayId, uint32_t w, uint32_t h) = 0;
// Enables readback of the given display.
virtual void deinitReadbackForDisplay(uint32_t displayId) = 0;
enum class DoNextReadbackResult {
OK_NOT_READY_FOR_READ,
OK_READY_FOR_READ,
};
// doNextReadback(): Call this from the emugl FrameBuffer::post thread
// or similar rendering thread.
// This will trigger an async glReadPixels of the current framebuffer.
// The post callback of Framebuffer will also be triggered, but
// in async mode it should do minimal work that involves |fbImage|.
// |repaint|: flag to prime async readback with multiple iterations
// so that the consumer of readback doesn't lag behind.
// |readbackBgra|: Whether to force the readback format as GL_BGRA_EXT,
// so that we get (depending on driver quality, heh) a gpu conversion of the
// readback image that is suitable for webrtc, which expects formats like that.
virtual DoNextReadbackResult doNextReadback(uint32_t displayId,
ColorBuffer* cb,
void* fbImage,
bool repaint,
bool readbackBgra) = 0;
// Retrieves the latest framebuffer that has been posted and read with
// doNextReadback. This is meant for apps like video encoding to use as
// input; they will need to do synchronized communication with the thread
// ReadbackWorker is running on.
virtual void getPixels(uint32_t displayId, void* out, uint32_t bytes) = 0;
// Duplicates the last frame and generates a post events if
// there are no read events active.
// This is usually called when there was no doNextReadback activity
// for a few ms, to guarantee that end users see the final frame.
enum class FlushResult {
FAIL,
OK_NOT_READY_FOR_READ,
OK_READY_FOR_READ,
};
virtual FlushResult flushPipeline(uint32_t displayId) = 0;
};
} // namespace gfxstream
|
