status_t VirtualDisplaySurface::queueBuffer(int pslot,
const QueueBufferInput& input, QueueBufferOutput* output) {
if (mDisplayId < 0)
return mSource[SOURCE_SINK]->queueBuffer(pslot, input, output);
VDS_LOGW_IF(mDbgState != DBG_STATE_GLES,
"Unexpected queueBuffer(pslot=%d) in %s state", pslot,
dbgStateStr());
mDbgState = DBG_STATE_GLES_DONE;
VDS_LOGV("queueBuffer pslot=%d", pslot);
status_t result;
if (mCompositionType == COMPOSITION_MIXED) {
// Queue the buffer back into the scratch pool
QueueBufferOutput scratchQBO;
int sslot = mapProducer2SourceSlot(SOURCE_SCRATCH, pslot);
result = mSource[SOURCE_SCRATCH]->queueBuffer(sslot, input, &scratchQBO);
if (result != NO_ERROR)
return result;
// Now acquire the buffer from the scratch pool -- should be the same
// slot and fence as we just queued.
Mutex::Autolock lock(mMutex);
BufferItem item;
result = acquireBufferLocked(&item, 0);
if (result != NO_ERROR)
return result;
VDS_LOGW_IF(item.mBuf != sslot,
"queueBuffer: acquired sslot %d from SCRATCH after queueing sslot %d",
item.mBuf, sslot);
mFbProducerSlot = mapSource2ProducerSlot(SOURCE_SCRATCH, item.mBuf);
mFbFence = mSlots[item.mBuf].mFence;
} else {
LOG_FATAL_IF(mCompositionType != COMPOSITION_GLES,
"Unexpected queueBuffer in state %s for compositionType %s",
dbgStateStr(), dbgCompositionTypeStr(mCompositionType));
// Extract the GLES release fence for HWC to acquire
int64_t timestamp;
bool isAutoTimestamp;
android_dataspace dataSpace;
Rect crop;
int scalingMode;
uint32_t transform;
bool async;
input.deflate(×tamp, &isAutoTimestamp, &dataSpace, &crop,
&scalingMode, &transform, &async, &mFbFence);
mFbProducerSlot = pslot;
mOutputFence = mFbFence;
}
*output = mQueueBufferOutput;
return NO_ERROR;
}
status_t VirtualDisplaySurface::prepareFrame(CompositionType compositionType) {
if (mDisplayId < 0)
return NO_ERROR;
VDS_LOGW_IF(mDbgState != DBG_STATE_BEGUN,
"Unexpected prepareFrame() in %s state", dbgStateStr());
mDbgState = DBG_STATE_PREPARED;
mCompositionType = compositionType;
if (sForceHwcCopy && mCompositionType == COMPOSITION_GLES) {
// Some hardware can do RGB->YUV conversion more efficiently in hardware
// controlled by HWC than in hardware controlled by the video encoder.
// Forcing GLES-composed frames to go through an extra copy by the HWC
// allows the format conversion to happen there, rather than passing RGB
// directly to the consumer.
//
// On the other hand, when the consumer prefers RGB or can consume RGB
// inexpensively, this forces an unnecessary copy.
mCompositionType = COMPOSITION_MIXED;
}
if (mCompositionType != mDbgLastCompositionType) {
VDS_LOGV("prepareFrame: composition type changed to %s",
dbgCompositionTypeStr(mCompositionType));
mDbgLastCompositionType = mCompositionType;
}
if (mCompositionType != COMPOSITION_GLES &&
(mOutputFormat != mDefaultOutputFormat ||
mOutputUsage != GRALLOC_USAGE_HW_COMPOSER)) {
// We must have just switched from GLES-only to MIXED or HWC
// composition. Stop using the format and usage requested by the GLES
// driver; they may be suboptimal when HWC is writing to the output
// buffer. For example, if the output is going to a video encoder, and
// HWC can write directly to YUV, some hardware can skip a
// memory-to-memory RGB-to-YUV conversion step.
//
// If we just switched *to* GLES-only mode, we'll change the
// format/usage and get a new buffer when the GLES driver calls
// dequeueBuffer().
mOutputFormat = mDefaultOutputFormat;
mOutputUsage = GRALLOC_USAGE_HW_COMPOSER;
refreshOutputBuffer();
}
return NO_ERROR;
}
