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
45 virtual ~BpGraphicBufferAlloc();
46
createGraphicBuffer(uint32_t width,uint32_t height,PixelFormat format,uint32_t usage,status_t * error)47 virtual sp<GraphicBuffer> createGraphicBuffer(uint32_t width,
48 uint32_t height, PixelFormat format, uint32_t usage,
49 status_t* error) {
50 Parcel data, reply;
51 data.writeInterfaceToken(IGraphicBufferAlloc::getInterfaceDescriptor());
52 data.writeUint32(width);
53 data.writeUint32(height);
54 data.writeInt32(static_cast<int32_t>(format));
55 data.writeUint32(usage);
56 remote()->transact(CREATE_GRAPHIC_BUFFER, data, &reply);
57 sp<GraphicBuffer> graphicBuffer;
58 status_t result = reply.readInt32();
59 if (result == NO_ERROR) {
60 graphicBuffer = new GraphicBuffer();
61 result = reply.read(*graphicBuffer);
62 if (result != NO_ERROR) {
63 graphicBuffer.clear();
64 }
65 // reply.readStrongBinder();
66 // here we don't even have to read the BufferReference from
67 // the parcel, it'll die with the parcel.
68 }
69 *error = result;
70 return graphicBuffer;
71 }
72 };
73
74 // Out-of-line virtual method definition to trigger vtable emission in this
75 // translation unit (see clang warning -Wweak-vtables)
~BpGraphicBufferAlloc()76 BpGraphicBufferAlloc::~BpGraphicBufferAlloc() {}
77
78 IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
79
80 // ----------------------------------------------------------------------
81
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)82 status_t BnGraphicBufferAlloc::onTransact(
83 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
84 {
85 // codes that don't require permission check
86
87 // BufferReference just keeps a strong reference to a GraphicBuffer until it
88 // is destroyed (that is, until no local or remote process have a reference
89 // to it).
90 class BufferReference : public BBinder {
91 sp<GraphicBuffer> mBuffer;
92 public:
93 BufferReference(const sp<GraphicBuffer>& buffer) : mBuffer(buffer) {}
94 };
95
96
97 switch (code) {
98 case CREATE_GRAPHIC_BUFFER: {
99 CHECK_INTERFACE(IGraphicBufferAlloc, data, reply);
100 uint32_t width = data.readUint32();
101 uint32_t height = data.readUint32();
102 PixelFormat format = static_cast<PixelFormat>(data.readInt32());
103 uint32_t usage = data.readUint32();
104 status_t error;
105 sp<GraphicBuffer> result =
106 createGraphicBuffer(width, height, format, usage, &error);
107 reply->writeInt32(error);
108 if (result != 0) {
109 reply->write(*result);
110 // We add a BufferReference to this parcel to make sure the
111 // buffer stays alive until the GraphicBuffer object on
112 // the other side has been created.
113 // This is needed so that the buffer handle can be
114 // registered before the buffer is destroyed on implementations
115 // that do not use file-descriptors to track their buffers.
116 reply->writeStrongBinder( new BufferReference(result) );
117 }
118 return NO_ERROR;
119 }
120 default:
121 return BBinder::onTransact(code, data, reply, flags);
122 }
123 }
124
125 }; // namespace android
126