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libgui: Allow an IGBProducer to disable allocation 

Adds a new method IGBP::allowAllocation, which controls whether
dequeueBuffer is permitted to allocate a new buffer. If allocation is
disallowed, dequeueBuffer will block or return an error as it
normally would (as controlled by *ControlledByApp).

If there are free buffers, but they are not of the correct dimensions,
format, or usage, they may be freed if a more suitable buffer is not
found first.

Bug: 19801715
Change-Id: I0d604958b78b2fd775c2547690301423f9a52165
This commit is contained in:
Dan Stoza 2015-04-16 17:28:43 -07:00
parent 0de7ea7529
commit 9de7293b0a
13 changed files with 150 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/gui/BufferQueueCore.h
View File

@ -266,6 +266,10 @@ private:
// mIsAllocatingCondition is a condition variable used by producers to wait until mIsAllocating
// becomes false.
mutable Condition mIsAllocatingCondition;
// mAllowAllocation determines whether dequeueBuffer is allowed to allocate
// new buffers
bool mAllowAllocation;
}; // class BufferQueueCore
} // namespace android

3
include/gui/BufferQueueProducer.h
View File

@ -172,6 +172,9 @@ public:
virtual void allocateBuffers(bool async, uint32_t width, uint32_t height,
PixelFormat format, uint32_t usage);
// See IGraphicBufferProducer::allowAllocation
virtual status_t allowAllocation(bool allow);
private:
// This is required by the IBinder::DeathRecipient interface
virtual void binderDied(const wp<IBinder>& who);

12
include/gui/IGraphicBufferProducer.h
View File

@ -458,6 +458,18 @@ public:
// allocated, this function has no effect.
virtual void allocateBuffers(bool async, uint32_t width, uint32_t height,
PixelFormat format, uint32_t usage) = 0;
// Sets whether dequeueBuffer is allowed to allocate new buffers.
//
// Normally dequeueBuffer does not discriminate between free slots which
// already have an allocated buffer and those which do not, and will
// allocate a new buffer if the slot doesn't have a buffer or if the slot's
// buffer doesn't match the requested size, format, or usage. This method
// allows the producer to restrict the eligible slots to those which already
// have an allocated buffer of the correct size, format, and usage. If no
// eligible slot is available, dequeueBuffer will block or return an error
// as usual.
virtual status_t allowAllocation(bool allow) = 0;
};
// ----------------------------------------------------------------------------

3
include/ui/GraphicBuffer.h
View File

@ -97,6 +97,9 @@ public:
status_t reallocate(uint32_t inWidth, uint32_t inHeight,
PixelFormat inFormat, uint32_t inUsage);
bool needsReallocation(uint32_t inWidth, uint32_t inHeight,
PixelFormat inFormat, uint32_t inUsage);
status_t lock(uint32_t inUsage, void** vaddr);
status_t lock(uint32_t inUsage, const Rect& rect, void** vaddr);
// For HAL_PIXEL_FORMAT_YCbCr_420_888

3
libs/gui/BufferQueueCore.cpp
View File

@ -69,7 +69,8 @@ BufferQueueCore::BufferQueueCore(const sp<IGraphicBufferAlloc>& allocator) :
mFrameCounter(0),
mTransformHint(0),
mIsAllocating(false),
mIsAllocatingCondition()
mIsAllocatingCondition(),
mAllowAllocation(true)
{
if (allocator == NULL) {
sp<ISurfaceComposer> composer(ComposerService::getComposerService());

68
libs/gui/BufferQueueProducer.cpp
View File

@ -219,7 +219,7 @@ status_t BufferQueueProducer::waitForFreeSlotThenRelock(const char* caller,
auto slot = mCore->mFreeBuffers.begin();
*found = *slot;
mCore->mFreeBuffers.erase(slot);
} else if (!mCore->mFreeSlots.empty()) {
} else if (mCore->mAllowAllocation && !mCore->mFreeSlots.empty()) {
auto slot = mCore->mFreeSlots.begin();
// Only return free slots up to the max buffer count
if (*slot < maxBufferCount) {
@ -285,17 +285,39 @@ status_t BufferQueueProducer::dequeueBuffer(int *outSlot,
// Enable the usage bits the consumer requested
usage |= mCore->mConsumerUsageBits;
int found;
status_t status = waitForFreeSlotThenRelock("dequeueBuffer", async,
&found, &returnFlags);
if (status != NO_ERROR) {
return status;
const bool useDefaultSize = !width && !height;
if (useDefaultSize) {
width = mCore->mDefaultWidth;
height = mCore->mDefaultHeight;
}
// This should not happen
if (found == BufferQueueCore::INVALID_BUFFER_SLOT) {
BQ_LOGE("dequeueBuffer: no available buffer slots");
return -EBUSY;
int found = BufferItem::INVALID_BUFFER_SLOT;
while (found == BufferItem::INVALID_BUFFER_SLOT) {
status_t status = waitForFreeSlotThenRelock("dequeueBuffer", async,
&found, &returnFlags);
if (status != NO_ERROR) {
return status;
}
// This should not happen
if (found == BufferQueueCore::INVALID_BUFFER_SLOT) {
BQ_LOGE("dequeueBuffer: no available buffer slots");
return -EBUSY;
}
const sp<GraphicBuffer>& buffer(mSlots[found].mGraphicBuffer);
// If we are not allowed to allocate new buffers,
// waitForFreeSlotThenRelock must have returned a slot containing a
// buffer. If this buffer would require reallocation to meet the
// requested attributes, we free it and attempt to get another one.
if (!mCore->mAllowAllocation) {
if (buffer->needsReallocation(width, height, format, usage)) {
mCore->freeBufferLocked(found);
found = BufferItem::INVALID_BUFFER_SLOT;
continue;
}
}
}
*outSlot = found;
@ -303,20 +325,11 @@ status_t BufferQueueProducer::dequeueBuffer(int *outSlot,
attachedByConsumer = mSlots[found].mAttachedByConsumer;
const bool useDefaultSize = !width && !height;
if (useDefaultSize) {
width = mCore->mDefaultWidth;
height = mCore->mDefaultHeight;
}
mSlots[found].mBufferState = BufferSlot::DEQUEUED;
const sp<GraphicBuffer>& buffer(mSlots[found].mGraphicBuffer);
if ((buffer == NULL) ||
(static_cast<uint32_t>(buffer->width) != width) ||
(static_cast<uint32_t>(buffer->height) != height) ||
(buffer->format != format) ||
((static_cast<uint32_t>(buffer->usage) & usage) != usage))
buffer->needsReallocation(width, height, format, usage))
{
mSlots[found].mAcquireCalled = false;
mSlots[found].mGraphicBuffer = NULL;
@ -933,6 +946,12 @@ void BufferQueueProducer::allocateBuffers(bool async, uint32_t width,
Mutex::Autolock lock(mCore->mMutex);
mCore->waitWhileAllocatingLocked();
if (!mCore->mAllowAllocation) {
BQ_LOGE("allocateBuffers: allocation is not allowed for this "
"BufferQueue");
return;
}
int currentBufferCount = 0;
for (int slot = 0; slot < BufferQueueDefs::NUM_BUFFER_SLOTS; ++slot) {
if (mSlots[slot].mGraphicBuffer != NULL) {
@ -1027,6 +1046,15 @@ void BufferQueueProducer::allocateBuffers(bool async, uint32_t width,
}
}
status_t BufferQueueProducer::allowAllocation(bool allow) {
ATRACE_CALL();
BQ_LOGV("allowAllocation: %s", allow ? "true" : "false");
Mutex::Autolock lock(mCore->mMutex);
mCore->mAllowAllocation = allow;
return NO_ERROR;
}
void BufferQueueProducer::binderDied(const wp<android::IBinder>& /* who */) {
// If we're here, it means that a producer we were connected to died.
// We're guaranteed that we are still connected to it because we remove

23
libs/gui/IGraphicBufferProducer.cpp
View File

@ -46,6 +46,7 @@ enum {
DISCONNECT,
SET_SIDEBAND_STREAM,
ALLOCATE_BUFFERS,
ALLOW_ALLOCATION,
};
class BpGraphicBufferProducer : public BpInterface<IGraphicBufferProducer>
@ -271,6 +272,18 @@ public:
ALOGE("allocateBuffers failed to transact: %d", result);
}
}
virtual status_t allowAllocation(bool allow) {
Parcel data, reply;
data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
data.writeInt32(static_cast<int32_t>(allow));
status_t result = remote()->transact(ALLOW_ALLOCATION, data, &reply);
if (result != NO_ERROR) {
return result;
}
result = reply.readInt32();
return result;
}
};
// Out-of-line virtual method definition to trigger vtable emission in this
@ -418,7 +431,7 @@ status_t BnGraphicBufferProducer::onTransact(
reply->writeInt32(result);
return NO_ERROR;
}
case ALLOCATE_BUFFERS:
case ALLOCATE_BUFFERS: {
CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
bool async = static_cast<bool>(data.readInt32());
uint32_t width = data.readUint32();
@ -427,6 +440,14 @@ status_t BnGraphicBufferProducer::onTransact(
uint32_t usage = data.readUint32();
allocateBuffers(async, width, height, format, usage);
return NO_ERROR;
}
case ALLOW_ALLOCATION: {
CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
bool allow = static_cast<bool>(data.readInt32());
status_t result = allowAllocation(allow);
reply->writeInt32(result);
return NO_ERROR;
}
}
return BBinder::onTransact(code, data, reply, flags);
}

36
libs/gui/tests/BufferQueue_test.cpp
View File

@ -364,4 +364,40 @@ TEST_F(BufferQueueTest, MoveFromConsumerToProducer) {
ASSERT_EQ(OK, item.mGraphicBuffer->unlock());
}
TEST_F(BufferQueueTest, TestDisallowingAllocation) {
createBufferQueue();
sp<DummyConsumer> dc(new DummyConsumer);
ASSERT_EQ(OK, mConsumer->consumerConnect(dc, true));
IGraphicBufferProducer::QueueBufferOutput output;
ASSERT_EQ(OK, mProducer->connect(new DummyProducerListener,
NATIVE_WINDOW_API_CPU, true, &output));
static const uint32_t WIDTH = 320;
static const uint32_t HEIGHT = 240;
ASSERT_EQ(OK, mConsumer->setDefaultBufferSize(WIDTH, HEIGHT));
int slot;
sp<Fence> fence;
sp<GraphicBuffer> buffer;
// This should return an error since it would require an allocation
ASSERT_EQ(OK, mProducer->allowAllocation(false));
ASSERT_EQ(WOULD_BLOCK, mProducer->dequeueBuffer(&slot, &fence, false, 0, 0,
0, GRALLOC_USAGE_SW_WRITE_OFTEN));
// This should succeed, now that we've lifted the prohibition
ASSERT_EQ(OK, mProducer->allowAllocation(true));
ASSERT_EQ(IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION,
mProducer->dequeueBuffer(&slot, &fence, false, 0, 0, 0,
GRALLOC_USAGE_SW_WRITE_OFTEN));
// Release the previous buffer back to the BufferQueue
mProducer->cancelBuffer(slot, fence);
// This should fail since we're requesting a different size
ASSERT_EQ(OK, mProducer->allowAllocation(false));
ASSERT_EQ(WOULD_BLOCK, mProducer->dequeueBuffer(&slot, &fence, false,
WIDTH * 2, HEIGHT * 2, 0, GRALLOC_USAGE_SW_WRITE_OFTEN));
}
} // namespace android

10
libs/ui/GraphicBuffer.cpp
View File

@ -152,6 +152,16 @@ status_t GraphicBuffer::reallocate(uint32_t inWidth, uint32_t inHeight,
return initSize(inWidth, inHeight, inFormat, inUsage);
}
bool GraphicBuffer::needsReallocation(uint32_t inWidth, uint32_t inHeight,
PixelFormat inFormat, uint32_t inUsage)
{
if (static_cast<int>(inWidth) != width) return true;
if (static_cast<int>(inHeight) != height) return true;
if (inFormat != format) return true;
if ((static_cast<uint32_t>(usage) & inUsage) != inUsage) return true;
return false;
}
status_t GraphicBuffer::initSize(uint32_t inWidth, uint32_t inHeight,
PixelFormat inFormat, uint32_t inUsage)
{

4
services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
View File

@ -526,6 +526,10 @@ void VirtualDisplaySurface::allocateBuffers(bool /* async */,
// TODO: Should we actually allocate buffers for a virtual display?
}
status_t VirtualDisplaySurface::allowAllocation(bool /* allow */) {
return INVALID_OPERATION;
}
void VirtualDisplaySurface::updateQueueBufferOutput(
const QueueBufferOutput& qbo) {
uint32_t w, h, transformHint, numPendingBuffers;

1
services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
View File

@ -115,6 +115,7 @@ private:
virtual status_t setSidebandStream(const sp<NativeHandle>& stream);
virtual void allocateBuffers(bool async, uint32_t width, uint32_t height,
PixelFormat format, uint32_t usage);
virtual status_t allowAllocation(bool allow);
//
// Utility methods

4
services/surfaceflinger/MonitoredProducer.cpp
View File

@ -110,6 +110,10 @@ void MonitoredProducer::allocateBuffers(bool async, uint32_t width,
mProducer->allocateBuffers(async, width, height, format, usage);
}
status_t MonitoredProducer::allowAllocation(bool allow) {
return mProducer->allowAllocation(allow);
}
IBinder* MonitoredProducer::onAsBinder() {
return IInterface::asBinder(mProducer).get();
}

1
services/surfaceflinger/MonitoredProducer.h
View File

@ -53,6 +53,7 @@ public:
virtual status_t setSidebandStream(const sp<NativeHandle>& stream);
virtual void allocateBuffers(bool async, uint32_t width, uint32_t height,
PixelFormat format, uint32_t usage);
virtual status_t allowAllocation(bool allow);
virtual IBinder* onAsBinder();
private: