libs/gui/IGraphicBufferProducer.cpp

   1 /*
   2  * Copyright (C) 2010 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 #include <stdint.h>
  18 #include <sys/types.h>
  19
  20 #include <utils/Errors.h>
  21 #include <utils/RefBase.h>
  22 #include <utils/Vector.h>
  23 #include <utils/Timers.h>
  24
  25 #include <binder/Parcel.h>
  26 #include <binder/IInterface.h>
  27
  28 #include <gui/IGraphicBufferProducer.h>
  29
  30 namespace android {
  31 // ----------------------------------------------------------------------------
  32
  33 enum {
  34     REQUEST_BUFFER = IBinder::FIRST_CALL_TRANSACTION,
  35     SET_BUFFER_COUNT,
  36     DEQUEUE_BUFFER,
  37     QUEUE_BUFFER,
  38     CANCEL_BUFFER,
  39     QUERY,
  40     CONNECT,
  41     DISCONNECT,
  42 };
  43
  44
  45 class BpGraphicBufferProducer : public BpInterface<IGraphicBufferProducer>
  46 {
  47 public:
  48     BpGraphicBufferProducer(const sp<IBinder>& impl)
  49         : BpInterface<IGraphicBufferProducer>(impl)
  50     {
  51     }
  52
  53     virtual status_t requestBuffer(int bufferIdx, sp<GraphicBuffer>* buf) {
  54         Parcel data, reply;
  55         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
  56         data.writeInt32(bufferIdx);
  57         status_t result =remote()->transact(REQUEST_BUFFER, data, &reply);
  58         if (result != NO_ERROR) {
  59             return result;
  60         }
  61         bool nonNull = reply.readInt32();
  62         if (nonNull) {
  63             *buf = new GraphicBuffer();
  64             reply.read(**buf);
  65         }
  66         result = reply.readInt32();
  67         return result;
  68     }
  69
  70     virtual status_t setBufferCount(int bufferCount)
  71     {
  72         Parcel data, reply;
  73         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
  74         data.writeInt32(bufferCount);
  75         status_t result =remote()->transact(SET_BUFFER_COUNT, data, &reply);
  76         if (result != NO_ERROR) {
  77             return result;
  78         }
  79         result = reply.readInt32();
  80         return result;
  81     }
  82
  83     virtual status_t dequeueBuffer(int *buf, sp<Fence>* fence, bool async,
  84             uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
  85         Parcel data, reply;
  86         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
  87         data.writeInt32(async);
  88         data.writeInt32(w);
  89         data.writeInt32(h);
  90         data.writeInt32(format);
  91         data.writeInt32(usage);
  92         status_t result = remote()->transact(DEQUEUE_BUFFER, data, &reply);
  93         if (result != NO_ERROR) {
  94             return result;
  95         }
  96         *buf = reply.readInt32();
  97         bool fenceWasWritten = reply.readInt32();
  98         if (fenceWasWritten) {
  99             // If the fence was written by the callee, then overwrite the
 100             // caller's fence here.  If it wasn't written then don't touch the
 101             // caller's fence.
 102             *fence = new Fence();
 103             reply.read(*(fence->get()));
 104         }
 105         result = reply.readInt32();
 106         return result;
 107     }
 108
 109     virtual status_t queueBuffer(int buf,
 110             const QueueBufferInput& input, QueueBufferOutput* output) {
 111         Parcel data, reply;
 112         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
 113         data.writeInt32(buf);
 114         data.write(input);
 115         status_t result = remote()->transact(QUEUE_BUFFER, data, &reply);
 116         if (result != NO_ERROR) {
 117             return result;
 118         }
 119         memcpy(output, reply.readInplace(sizeof(*output)), sizeof(*output));
 120         result = reply.readInt32();
 121         return result;
 122     }
 123
 124     virtual void cancelBuffer(int buf, const sp<Fence>& fence) {
 125         Parcel data, reply;
 126         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
 127         data.writeInt32(buf);
 128         data.write(*fence.get());
 129         remote()->transact(CANCEL_BUFFER, data, &reply);
 130     }
 131
 132     virtual int query(int what, int* value) {
 133         Parcel data, reply;
 134         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
 135         data.writeInt32(what);
 136         status_t result = remote()->transact(QUERY, data, &reply);
 137         if (result != NO_ERROR) {
 138             return result;
 139         }
 140         value[0] = reply.readInt32();
 141         result = reply.readInt32();
 142         return result;
 143     }
 144
 145     virtual status_t connect(int api, bool producerControlledByApp, QueueBufferOutput* output) {
 146         Parcel data, reply;
 147         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
 148         data.writeInt32(api);
 149         data.writeInt32(producerControlledByApp);
 150         status_t result = remote()->transact(CONNECT, data, &reply);
 151         if (result != NO_ERROR) {
 152             return result;
 153         }
 154         memcpy(output, reply.readInplace(sizeof(*output)), sizeof(*output));
 155         result = reply.readInt32();
 156         return result;
 157     }
 158
 159     virtual status_t disconnect(int api) {
 160         Parcel data, reply;
 161         data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
 162         data.writeInt32(api);
 163         status_t result =remote()->transact(DISCONNECT, data, &reply);
 164         if (result != NO_ERROR) {
 165             return result;
 166         }
 167         result = reply.readInt32();
 168         return result;
 169     }
 170 };
 171
 172 IMPLEMENT_META_INTERFACE(GraphicBufferProducer, "android.gui.IGraphicBufferProducer");
 173
 174 // ----------------------------------------------------------------------
 175
 176 status_t BnGraphicBufferProducer::onTransact(
 177     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
 178 {
 179     switch(code) {
 180         case REQUEST_BUFFER: {
 181             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 182             int bufferIdx   = data.readInt32();
 183             sp<GraphicBuffer> buffer;
 184             int result = requestBuffer(bufferIdx, &buffer);
 185             reply->writeInt32(buffer != 0);
 186             if (buffer != 0) {
 187                 reply->write(*buffer);
 188             }
 189             reply->writeInt32(result);
 190             return NO_ERROR;
 191         } break;
 192         case SET_BUFFER_COUNT: {
 193             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 194             int bufferCount = data.readInt32();
 195             int result = setBufferCount(bufferCount);
 196             reply->writeInt32(result);
 197             return NO_ERROR;
 198         } break;
 199         case DEQUEUE_BUFFER: {
 200             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 201             bool async      = data.readInt32();
 202             uint32_t w      = data.readInt32();
 203             uint32_t h      = data.readInt32();
 204             uint32_t format = data.readInt32();
 205             uint32_t usage  = data.readInt32();
 206             int buf;
 207             sp<Fence> fence;
 208             int result = dequeueBuffer(&buf, &fence, async, w, h, format, usage);
 209             reply->writeInt32(buf);
 210             reply->writeInt32(fence != NULL);
 211             if (fence != NULL) {
 212                 reply->write(*fence.get());
 213             }
 214             reply->writeInt32(result);
 215             return NO_ERROR;
 216         } break;
 217         case QUEUE_BUFFER: {
 218             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 219             int buf = data.readInt32();
 220             QueueBufferInput input(data);
 221             QueueBufferOutput* const output =
 222                     reinterpret_cast<QueueBufferOutput *>(
 223                             reply->writeInplace(sizeof(QueueBufferOutput)));
 224             status_t result = queueBuffer(buf, input, output);
 225             reply->writeInt32(result);
 226             return NO_ERROR;
 227         } break;
 228         case CANCEL_BUFFER: {
 229             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 230             int buf = data.readInt32();
 231             sp<Fence> fence = new Fence();
 232             data.read(*fence.get());
 233             cancelBuffer(buf, fence);
 234             return NO_ERROR;
 235         } break;
 236         case QUERY: {
 237             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 238             int value;
 239             int what = data.readInt32();
 240             int res = query(what, &value);
 241             reply->writeInt32(value);
 242             reply->writeInt32(res);
 243             return NO_ERROR;
 244         } break;
 245         case CONNECT: {
 246             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 247             int api = data.readInt32();
 248             bool producerControlledByApp = data.readInt32();
 249             QueueBufferOutput* const output =
 250                     reinterpret_cast<QueueBufferOutput *>(
 251                             reply->writeInplace(sizeof(QueueBufferOutput)));
 252             status_t res = connect(api, producerControlledByApp, output);
 253             reply->writeInt32(res);
 254             return NO_ERROR;
 255         } break;
 256         case DISCONNECT: {
 257             CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
 258             int api = data.readInt32();
 259             status_t res = disconnect(api);
 260             reply->writeInt32(res);
 261             return NO_ERROR;
 262         } break;
 263     }
 264     return BBinder::onTransact(code, data, reply, flags);
 265 }
 266
 267 // ----------------------------------------------------------------------------
 268
 269 IGraphicBufferProducer::QueueBufferInput::QueueBufferInput(const Parcel& parcel) {
 270     parcel.read(*this);
 271 }
 272
 273 size_t IGraphicBufferProducer::QueueBufferInput::getFlattenedSize() const
 274 {
 275     return sizeof(timestamp)
 276          + sizeof(crop)
 277          + sizeof(scalingMode)
 278          + sizeof(transform)
 279          + sizeof(async)
 280          + fence->getFlattenedSize();
 281 }
 282
 283 size_t IGraphicBufferProducer::QueueBufferInput::getFdCount() const
 284 {
 285     return fence->getFdCount();
 286 }
 287
 288 status_t IGraphicBufferProducer::QueueBufferInput::flatten(void* buffer, size_t size,
 289         int fds[], size_t count) const
 290 {
 291     status_t err = NO_ERROR;
 292     char* p = (char*)buffer;
 293     memcpy(p, &timestamp,   sizeof(timestamp));   p += sizeof(timestamp);
 294     memcpy(p, &crop,        sizeof(crop));        p += sizeof(crop);
 295     memcpy(p, &scalingMode, sizeof(scalingMode)); p += sizeof(scalingMode);
 296     memcpy(p, &transform,   sizeof(transform));   p += sizeof(transform);
 297     memcpy(p, &async,       sizeof(async));       p += sizeof(async);
 298     err = fence->flatten(p, size - (p - (char*)buffer), fds, count);
 299     return err;
 300 }
 301
 302 status_t IGraphicBufferProducer::QueueBufferInput::unflatten(void const* buffer,
 303         size_t size, int fds[], size_t count)
 304 {
 305     status_t err = NO_ERROR;
 306     const char* p = (const char*)buffer;
 307     memcpy(&timestamp,   p, sizeof(timestamp));   p += sizeof(timestamp);
 308     memcpy(&crop,        p, sizeof(crop));        p += sizeof(crop);
 309     memcpy(&scalingMode, p, sizeof(scalingMode)); p += sizeof(scalingMode);
 310     memcpy(&transform,   p, sizeof(transform));   p += sizeof(transform);
 311     memcpy(&async,       p, sizeof(async));       p += sizeof(async);
 312     fence = new Fence();
 313     err = fence->unflatten(p, size - (p - (const char*)buffer), fds, count);
 314     return err;
 315 }
 316
 317 }; // namespace android