1 /*
2 * Copyright (C) 2011 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 // tag as surfaceflinger
18 #define LOG_TAG "SurfaceFlinger"
19
20 #include <stdint.h>
21 #include <sys/types.h>
22
23 #include <binder/Parcel.h>
24
25 #include <ui/GraphicBuffer.h>
26
27 #include <gui/IGraphicBufferAlloc.h>
28
29 // ---------------------------------------------------------------------------
30
31 namespace android {
32
33 enum {
34 CREATE_GRAPHIC_BUFFER = IBinder::FIRST_CALL_TRANSACTION,
35 };
36
37 class BpGraphicBufferAlloc : public BpInterface<IGraphicBufferAlloc>
38 {
39 public:
BpGraphicBufferAlloc(const sp<IBinder> & impl)40 BpGraphicBufferAlloc(const sp<IBinder>& impl)
41 : BpInterface<IGraphicBufferAlloc>(impl)
42 {
43 }
44
createGraphicBuffer(uint32_t w,uint32_t h,PixelFormat format,uint32_t usage,status_t * error)45 virtual sp<GraphicBuffer> createGraphicBuffer(uint32_t w, uint32_t h,
46 PixelFormat format, uint32_t usage, status_t* error) {
47 Parcel data, reply;
48 data.writeInterfaceToken(IGraphicBufferAlloc::getInterfaceDescriptor());
49 data.writeInt32(w);
50 data.writeInt32(h);
51 data.writeInt32(format);
52 data.writeInt32(usage);
53 remote()->transact(CREATE_GRAPHIC_BUFFER, data, &reply);
54 sp<GraphicBuffer> graphicBuffer;
55 status_t result = reply.readInt32();
56 if (result == NO_ERROR) {
57 graphicBuffer = new GraphicBuffer();
58 result = reply.read(*graphicBuffer);
59 // reply.readStrongBinder();
60 // here we don't even have to read the BufferReference from
61 // the parcel, it'll die with the parcel.
62 }
63 *error = result;
64 return graphicBuffer;
65 }
66 };
67
68 IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
69
70 // ----------------------------------------------------------------------
71
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)72 status_t BnGraphicBufferAlloc::onTransact(
73 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
74 {
75 // codes that don't require permission check
76
77 /* BufferReference just keeps a strong reference to a
78 * GraphicBuffer until it is destroyed (that is, until
79 * no local or remote process have a reference to it).
80 */
81 class BufferReference : public BBinder {
82 sp<GraphicBuffer> buffer;
83 public:
84 BufferReference(const sp<GraphicBuffer>& buffer) : buffer(buffer) { }
85 };
86
87
88 switch(code) {
89 case CREATE_GRAPHIC_BUFFER: {
90 CHECK_INTERFACE(IGraphicBufferAlloc, data, reply);
91 uint32_t w = data.readInt32();
92 uint32_t h = data.readInt32();
93 PixelFormat format = data.readInt32();
94 uint32_t usage = data.readInt32();
95 status_t error;
96 sp<GraphicBuffer> result =
97 createGraphicBuffer(w, h, format, usage, &error);
98 reply->writeInt32(error);
99 if (result != 0) {
100 reply->write(*result);
101 // We add a BufferReference to this parcel to make sure the
102 // buffer stays alive until the GraphicBuffer object on
103 // the other side has been created.
104 // This is needed so that the buffer handle can be
105 // registered before the buffer is destroyed on implementations
106 // that do not use file-descriptors to track their buffers.
107 reply->writeStrongBinder( new BufferReference(result) );
108 }
109 return NO_ERROR;
110 } break;
111 default:
112 return BBinder::onTransact(code, data, reply, flags);
113 }
114 }
115
116 }; // namespace android
117