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
31namespace android {
32
33enum {
34    CREATE_GRAPHIC_BUFFER = IBinder::FIRST_CALL_TRANSACTION,
35};
36
37class BpGraphicBufferAlloc : public BpInterface<IGraphicBufferAlloc>
38{
39public:
40    BpGraphicBufferAlloc(const sp<IBinder>& impl)
41        : BpInterface<IGraphicBufferAlloc>(impl)
42    {
43    }
44
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
68IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
69
70// ----------------------------------------------------------------------
71
72status_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