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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*
* Copyright (C) 2011 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.
*/
// tag as surfaceflinger
#define LOG_TAG "SurfaceFlinger"
#include <stdint.h>
#include <sys/types.h>
#include <binder/Parcel.h>
#include <ui/GraphicBuffer.h>
#include <gui/IGraphicBufferAlloc.h>
// ---------------------------------------------------------------------------
namespace android {
enum {
CREATE_GRAPHIC_BUFFER = IBinder::FIRST_CALL_TRANSACTION,
};
class BpGraphicBufferAlloc : public BpInterface<IGraphicBufferAlloc>
{
public:
BpGraphicBufferAlloc(const sp<IBinder>& impl)
: BpInterface<IGraphicBufferAlloc>(impl)
{
}
virtual sp<GraphicBuffer> createGraphicBuffer(uint32_t w, uint32_t h,
PixelFormat format, uint32_t usage, status_t* error) {
Parcel data, reply;
data.writeInterfaceToken(IGraphicBufferAlloc::getInterfaceDescriptor());
data.writeInt32(w);
data.writeInt32(h);
data.writeInt32(format);
data.writeInt32(usage);
remote()->transact(CREATE_GRAPHIC_BUFFER, data, &reply);
sp<GraphicBuffer> graphicBuffer;
status_t result = reply.readInt32();
if (result == NO_ERROR) {
graphicBuffer = new GraphicBuffer();
result = reply.read(*graphicBuffer);
// reply.readStrongBinder();
// here we don't even have to read the BufferReference from
// the parcel, it'll die with the parcel.
}
*error = result;
return graphicBuffer;
}
};
IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
// ----------------------------------------------------------------------
status_t BnGraphicBufferAlloc::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
// codes that don't require permission check
/* BufferReference just keeps a strong reference to a
* GraphicBuffer until it is destroyed (that is, until
* no local or remote process have a reference to it).
*/
class BufferReference : public BBinder {
sp<GraphicBuffer> buffer;
public:
BufferReference(const sp<GraphicBuffer>& buffer) : buffer(buffer) { }
};
switch(code) {
case CREATE_GRAPHIC_BUFFER: {
CHECK_INTERFACE(IGraphicBufferAlloc, data, reply);
uint32_t w = data.readInt32();
uint32_t h = data.readInt32();
PixelFormat format = data.readInt32();
uint32_t usage = data.readInt32();
status_t error;
sp<GraphicBuffer> result =
createGraphicBuffer(w, h, format, usage, &error);
reply->writeInt32(error);
if (result != 0) {
reply->write(*result);
// We add a BufferReference to this parcel to make sure the
// buffer stays alive until the GraphicBuffer object on
// the other side has been created.
// This is needed so that the buffer handle can be
// registered before the buffer is destroyed on implementations
// that do not use file-descriptors to track their buffers.
reply->writeStrongBinder( new BufferReference(result) );
}
return NO_ERROR;
} break;
default:
return BBinder::onTransact(code, data, reply, flags);
}
}
}; // namespace android
|
