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      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:
     40     BpGraphicBufferAlloc(const sp<IBinder>& impl)
     41         : BpInterface<IGraphicBufferAlloc>(impl)
     42     {
     43     }
     44 
     45     virtual ~BpGraphicBufferAlloc();
     46 
     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)
     76 BpGraphicBufferAlloc::~BpGraphicBufferAlloc() {}
     77 
     78 IMPLEMENT_META_INTERFACE(GraphicBufferAlloc, "android.ui.IGraphicBufferAlloc");
     79 
     80 // ----------------------------------------------------------------------
     81 
     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