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,std::string requestorName,status_t * error)47 virtual sp<GraphicBuffer> createGraphicBuffer(uint32_t width,
48 uint32_t height, PixelFormat format, uint32_t usage,
49 std::string requestorName, 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 if (requestorName.empty()) {
57 requestorName += "[PID ";
58 requestorName += std::to_string(getpid());
59 requestorName += ']';
60 }
61 data.writeUtf8AsUtf16(requestorName);
62 remote()->transact(CREATE_GRAPHIC_BUFFER, data, &reply);
63 sp<GraphicBuffer> graphicBuffer;
64 status_t result = reply.readInt32();
65 if (result == NO_ERROR) {
66 graphicBuffer = new GraphicBuffer();
67 result = reply.read(*graphicBuffer);
68 if (result != NO_ERROR) {
69 graphicBuffer.clear();
70 }
71 // reply.readStrongBinder();
72 // here we don't even have to read the BufferReference from
73 // the parcel, it'll die with the parcel.
74 }
75 *error = result;
76 return graphicBuffer;
77 }
78 };
79
80 // Out-of-line virtual method definition to trigger vtable emission in this
81 // translation unit (see clang warning -Wweak-vtables)
~BpGraphicBufferAlloc()82 BpGraphicBufferAlloc::~BpGraphicBufferAlloc() {}
83
84 IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
85
86 // ----------------------------------------------------------------------
87
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)88 status_t BnGraphicBufferAlloc::onTransact(
89 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
90 {
91 // codes that don't require permission check
92
93 // BufferReference just keeps a strong reference to a GraphicBuffer until it
94 // is destroyed (that is, until no local or remote process have a reference
95 // to it).
96 class BufferReference : public BBinder {
97 sp<GraphicBuffer> mBuffer;
98 public:
99 BufferReference(const sp<GraphicBuffer>& buffer) : mBuffer(buffer) {}
100 };
101
102
103 switch (code) {
104 case CREATE_GRAPHIC_BUFFER: {
105 CHECK_INTERFACE(IGraphicBufferAlloc, data, reply);
106 uint32_t width = data.readUint32();
107 uint32_t height = data.readUint32();
108 PixelFormat format = static_cast<PixelFormat>(data.readInt32());
109 uint32_t usage = data.readUint32();
110 status_t error = NO_ERROR;
111 std::string requestorName;
112 data.readUtf8FromUtf16(&requestorName);
113 sp<GraphicBuffer> result = createGraphicBuffer(width, height,
114 format, usage, requestorName, &error);
115 reply->writeInt32(error);
116 if (result != 0) {
117 reply->write(*result);
118 // We add a BufferReference to this parcel to make sure the
119 // buffer stays alive until the GraphicBuffer object on
120 // the other side has been created.
121 // This is needed so that the buffer handle can be
122 // registered before the buffer is destroyed on implementations
123 // that do not use file-descriptors to track their buffers.
124 reply->writeStrongBinder( new BufferReference(result) );
125 }
126 return NO_ERROR;
127 }
128 default:
129 return BBinder::onTransact(code, data, reply, flags);
130 }
131 }
132
133 }; // namespace android
134