services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp

   1 /*
   2  * Copyright 2013 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 "VirtualDisplaySurface.h"
  18 #include "HWComposer.h"
  19
  20 // ---------------------------------------------------------------------------
  21 namespace android {
  22 // ---------------------------------------------------------------------------
  23
  24 VirtualDisplaySurface::VirtualDisplaySurface(HWComposer& hwc, int disp,
  25         const sp<IGraphicBufferProducer>& sink, const String8& name)
  26 :   mHwc(hwc),
  27     mDisplayId(disp),
  28     mSource(new BufferQueueInterposer(sink, name)),
  29     mName(name),
  30     mReleaseFence(Fence::NO_FENCE)
  31 {}
  32
  33 VirtualDisplaySurface::~VirtualDisplaySurface() {
  34     if (mAcquiredBuffer != NULL) {
  35         status_t result = mSource->releaseBuffer(mReleaseFence);
  36         ALOGE_IF(result != NO_ERROR, "VirtualDisplaySurface \"%s\": "
  37                 "failed to release previous buffer: %d",
  38                 mName.string(), result);
  39     }
  40 }
  41
  42 sp<IGraphicBufferProducer> VirtualDisplaySurface::getIGraphicBufferProducer() const {
  43     return mSource;
  44 }
  45
  46 status_t VirtualDisplaySurface::compositionComplete() {
  47     return NO_ERROR;
  48 }
  49
  50 status_t VirtualDisplaySurface::advanceFrame() {
  51     Mutex::Autolock lock(mMutex);
  52     status_t result = NO_ERROR;
  53
  54     if (mAcquiredBuffer != NULL) {
  55         result = mSource->releaseBuffer(mReleaseFence);
  56         ALOGE_IF(result != NO_ERROR, "VirtualDisplaySurface \"%s\": "
  57                 "failed to release previous buffer: %d",
  58                 mName.string(), result);
  59         mAcquiredBuffer.clear();
  60         mReleaseFence = Fence::NO_FENCE;
  61     }
  62
  63     sp<Fence> fence;
  64     result = mSource->acquireBuffer(&mAcquiredBuffer, &fence);
  65     if (result == BufferQueueInterposer::NO_BUFFER_AVAILABLE) {
  66         result = mSource->pullEmptyBuffer();
  67         if (result != NO_ERROR)
  68             return result;
  69         result = mSource->acquireBuffer(&mAcquiredBuffer, &fence);
  70     }
  71     if (result != NO_ERROR)
  72         return result;
  73
  74     return mHwc.fbPost(mDisplayId, fence, mAcquiredBuffer);
  75 }
  76
  77 status_t VirtualDisplaySurface::setReleaseFenceFd(int fenceFd) {
  78     if (fenceFd >= 0) {
  79         sp<Fence> fence(new Fence(fenceFd));
  80         Mutex::Autolock lock(mMutex);
  81         sp<Fence> mergedFence = Fence::merge(
  82                 String8::format("VirtualDisplaySurface \"%s\"",
  83                         mName.string()),
  84                 mReleaseFence, fence);
  85         if (!mergedFence->isValid()) {
  86             ALOGE("VirtualDisplaySurface \"%s\": failed to merge release fence",
  87                     mName.string());
  88             // synchronization is broken, the best we can do is hope fences
  89             // signal in order so the new fence will act like a union
  90             mReleaseFence = fence;
  91             return BAD_VALUE;
  92         }
  93         mReleaseFence = mergedFence;
  94     }
  95     return NO_ERROR;
  96 }
  97
  98 void VirtualDisplaySurface::dump(String8& result) const {
  99 }
 100
 101 // ---------------------------------------------------------------------------
 102 } // namespace android
 103 // ---------------------------------------------------------------------------