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BufferQueue: clean up buffer counting 

This change is a clean up of some of the handling of the maximum number of
buffers that are allowed at once.  It mostly renames a few member variables and
methods, but it includes a couple small refactorings.

Change-Id: I9959310f563d09583548d4291e1050a7bbc7d87d
This commit is contained in:
Jamie Gennis 2012-08-24 17:25:13 -07:00
parent c1396dd145
commit 31a353da22
7 changed files with 91 additions and 87 deletions
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45
include/gui/BufferQueue.h
View File

@ -252,10 +252,10 @@ public:
// requestBuffers when a with and height of zero is requested.
status_t setDefaultBufferSize(uint32_t w, uint32_t h);
// setBufferCountServer set the buffer count. If the client has requested
// setDefaultBufferCount set the buffer count. If the client has requested
// a buffer count using setBufferCount, the server-buffer count will
// take effect once the client sets the count back to zero.
status_t setBufferCountServer(int bufferCount);
status_t setDefaultMaxBufferCount(int bufferCount);
// isSynchronousMode returns whether the SurfaceTexture is currently in
// synchronous mode.
@ -298,7 +298,14 @@ private:
// are freed except the current buffer.
status_t drainQueueAndFreeBuffersLocked();
status_t setBufferCountServerLocked(int bufferCount);
// setDefaultMaxBufferCountLocked sets the maximum number of buffer slots
// that will be used if the producer does not override the buffer slot
// count.
status_t setDefaultMaxBufferCountLocked(int count);
// getMinBufferCountLocked returns the minimum number of buffers allowed
// given the current BufferQueue state.
int getMinMaxBufferCountLocked() const;
struct BufferSlot {
@ -426,26 +433,22 @@ private:
// not dequeued at any time
int mMinUndequeuedBuffers;
// mMinAsyncBufferSlots is a constraint on the minimum mBufferCount
// when this BufferQueue is in asynchronous mode
int mMinAsyncBufferSlots;
// mMaxBufferCount is the maximum number of buffers that will be allocated
// at once.
int mMaxBufferCount;
// mMinSyncBufferSlots is a constraint on the minimum mBufferCount
// when this BufferQueue is in synchronous mode
int mMinSyncBufferSlots;
// mDefaultMaxBufferCount is the default limit on the number of buffers
// that will be allocated at one time. This default limit is set by the
// consumer. The limit (as opposed to the default limit) may be
// overridden by the producer.
int mDefaultMaxBufferCount;
// mBufferCount is the number of buffer slots that the client and server
// must maintain. It defaults to MIN_ASYNC_BUFFER_SLOTS and can be changed
// by calling setBufferCount or setBufferCountServer
int mBufferCount;
// mClientBufferCount is the number of buffer slots requested by the client.
// The default is zero, which means the client doesn't care how many buffers
// there is.
int mClientBufferCount;
// mServerBufferCount buffer count requested by the server-side
int mServerBufferCount;
// mOverrideMaxBufferCount is the limit on the number of buffers that will
// be allocated at one time. This value is set by the image producer by
// calling setBufferCount. The default is zero, which means the producer
// doesn't care about the number of buffers in the pool. In that case
// mDefaultMaxBufferCount is used as the limit.
int mOverrideMaxBufferCount;
// mGraphicBufferAlloc is the connection to SurfaceFlinger that is used to
// allocate new GraphicBuffer objects.

8
include/gui/SurfaceTexture.h
View File

@ -87,10 +87,10 @@ public:
// when finished with it.
void setReleaseFence(int fenceFd);
// setBufferCountServer set the buffer count. If the client has requested
// a buffer count using setBufferCount, the server-buffer count will
// take effect once the client sets the count back to zero.
status_t setBufferCountServer(int bufferCount);
// setDefaultMaxBufferCount sets the default limit on the maximum number
// of buffers that will be allocated at one time. The image producer may
// override the limit.
status_t setDefaultMaxBufferCount(int bufferCount);
// getTransformMatrix retrieves the 4x4 texture coordinate transform matrix
// associated with the texture image set by the most recent call to

103
libs/gui/BufferQueue.cpp
View File

@ -86,11 +86,9 @@ BufferQueue::BufferQueue(bool allowSynchronousMode, int bufferCount,
mDefaultWidth(1),
mDefaultHeight(1),
mMinUndequeuedBuffers(bufferCount),
mMinAsyncBufferSlots(bufferCount + 1),
mMinSyncBufferSlots(bufferCount),
mBufferCount(mMinAsyncBufferSlots),
mClientBufferCount(0),
mServerBufferCount(mMinAsyncBufferSlots),
mMaxBufferCount(bufferCount + 1),
mDefaultMaxBufferCount(bufferCount + 1),
mOverrideMaxBufferCount(0),
mSynchronousMode(false),
mAllowSynchronousMode(allowSynchronousMode),
mConnectedApi(NO_CONNECTED_API),
@ -120,19 +118,19 @@ BufferQueue::~BufferQueue() {
ST_LOGV("~BufferQueue");
}
status_t BufferQueue::setBufferCountServerLocked(int bufferCount) {
if (bufferCount > NUM_BUFFER_SLOTS)
status_t BufferQueue::setDefaultMaxBufferCountLocked(int count) {
if (count > NUM_BUFFER_SLOTS)
return BAD_VALUE;
mServerBufferCount = bufferCount;
mDefaultMaxBufferCount = count;
if (bufferCount == mBufferCount)
if (count == mMaxBufferCount)
return OK;
if (!mClientBufferCount &&
bufferCount >= mBufferCount) {
if (!mOverrideMaxBufferCount &&
count >= mMaxBufferCount) {
// easy, we just have more buffers
mBufferCount = bufferCount;
mMaxBufferCount = count;
mDequeueCondition.broadcast();
} else {
// we're here because we're either
@ -140,15 +138,16 @@ status_t BufferQueue::setBufferCountServerLocked(int bufferCount) {
// - or there is a client-buffer-count in effect
// less than 2 buffers is never allowed
if (bufferCount < 2)
if (count < 2)
return BAD_VALUE;
// when there is non client-buffer-count in effect, the client is not
// allowed to dequeue more than one buffer at a time,
// so the next time they dequeue a buffer, we know that they don't
// own one. the actual resizing will happen during the next
// dequeueBuffer.
// When there is no client-buffer-count in effect, the client is not
// allowed to dequeue more than one buffer at a time, so the next time
// they dequeue a buffer, we know that they don't own one. the actual
// resizing will happen during the next dequeueBuffer.
// We signal this condition in case there is already a blocked
// dequeueBuffer call.
mDequeueCondition.broadcast();
}
return OK;
@ -199,20 +198,19 @@ status_t BufferQueue::setBufferCount(int bufferCount) {
}
// Error out if the user has dequeued buffers
for (int i=0 ; i<mBufferCount ; i++) {
for (int i=0 ; i<mMaxBufferCount ; i++) {
if (mSlots[i].mBufferState == BufferSlot::DEQUEUED) {
ST_LOGE("setBufferCount: client owns some buffers");
return -EINVAL;
}
}
const int minBufferSlots = mSynchronousMode ?
mMinSyncBufferSlots : mMinAsyncBufferSlots;
const int minBufferSlots = getMinMaxBufferCountLocked();
if (bufferCount == 0) {
mClientBufferCount = 0;
bufferCount = (mServerBufferCount >= minBufferSlots) ?
mServerBufferCount : minBufferSlots;
return setBufferCountServerLocked(bufferCount);
mOverrideMaxBufferCount = 0;
bufferCount = (mDefaultMaxBufferCount >= minBufferSlots) ?
mDefaultMaxBufferCount : minBufferSlots;
return setDefaultMaxBufferCountLocked(bufferCount);
}
if (bufferCount < minBufferSlots) {
@ -224,8 +222,8 @@ status_t BufferQueue::setBufferCount(int bufferCount) {
// here we're guaranteed that the client doesn't have dequeued buffers
// and will release all of its buffer references.
freeAllBuffersLocked();
mBufferCount = bufferCount;
mClientBufferCount = bufferCount;
mMaxBufferCount = bufferCount;
mOverrideMaxBufferCount = bufferCount;
mBufferHasBeenQueued = false;
mQueue.clear();
mDequeueCondition.broadcast();
@ -282,9 +280,9 @@ status_t BufferQueue::requestBuffer(int slot, sp<GraphicBuffer>* buf) {
ST_LOGE("requestBuffer: SurfaceTexture has been abandoned!");
return NO_INIT;
}
if (slot < 0 || mBufferCount <= slot) {
if (slot < 0 || mMaxBufferCount <= slot) {
ST_LOGE("requestBuffer: slot index out of range [0, %d]: %d",
mBufferCount, slot);
mMaxBufferCount, slot);
return BAD_VALUE;
}
mSlots[slot].mRequestBufferCalled = true;
@ -330,21 +328,20 @@ status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>& outFence,
// The condition "number of buffers needs to change" is true if
// - the client doesn't care about how many buffers there are
// - AND the actual number of buffer is different from what was
// set in the last setBufferCountServer()
// set in the last setDefaultMaxBufferCount()
// - OR -
// setBufferCountServer() was set to a value incompatible with
// setDefaultMaxBufferCount() was set to a value incompatible with
// the synchronization mode (for instance because the sync mode
// changed since)
//
// As long as this condition is true AND the FIFO is not empty, we
// wait on mDequeueCondition.
const int minBufferCountNeeded = mSynchronousMode ?
mMinSyncBufferSlots : mMinAsyncBufferSlots;
const int minBufferCountNeeded = getMinMaxBufferCountLocked();
const bool numberOfBuffersNeedsToChange = !mClientBufferCount &&
((mServerBufferCount != mBufferCount) ||
(mServerBufferCount < minBufferCountNeeded));
const bool numberOfBuffersNeedsToChange = !mOverrideMaxBufferCount &&
((mDefaultMaxBufferCount != mMaxBufferCount) ||
(mDefaultMaxBufferCount < minBufferCountNeeded));
if (!mQueue.isEmpty() && numberOfBuffersNeedsToChange) {
// wait for the FIFO to drain
@ -357,9 +354,9 @@ status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>& outFence,
if (numberOfBuffersNeedsToChange) {
// here we're guaranteed that mQueue is empty
freeAllBuffersLocked();
mBufferCount = mServerBufferCount;
if (mBufferCount < minBufferCountNeeded)
mBufferCount = minBufferCountNeeded;
mMaxBufferCount = mDefaultMaxBufferCount;
if (mMaxBufferCount < minBufferCountNeeded)
mMaxBufferCount = minBufferCountNeeded;
mBufferHasBeenQueued = false;
returnFlags |= ISurfaceTexture::RELEASE_ALL_BUFFERS;
}
@ -367,7 +364,7 @@ status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>& outFence,
// look for a free buffer to give to the client
found = INVALID_BUFFER_SLOT;
dequeuedCount = 0;
for (int i = 0; i < mBufferCount; i++) {
for (int i = 0; i < mMaxBufferCount; i++) {
const int state = mSlots[i].mBufferState;
if (state == BufferSlot::DEQUEUED) {
dequeuedCount++;
@ -397,7 +394,7 @@ status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>& outFence,
// clients are not allowed to dequeue more than one buffer
// if they didn't set a buffer count.
if (!mClientBufferCount && dequeuedCount) {
if (!mOverrideMaxBufferCount && dequeuedCount) {
ST_LOGE("dequeueBuffer: can't dequeue multiple buffers without "
"setting the buffer count");
return -EINVAL;
@ -409,7 +406,7 @@ status_t BufferQueue::dequeueBuffer(int *outBuf, sp<Fence>& outFence,
if (mBufferHasBeenQueued) {
// make sure the client is not trying to dequeue more buffers
// than allowed.
const int avail = mBufferCount - (dequeuedCount+1);
const int avail = mMaxBufferCount - (dequeuedCount+1);
if (avail < (mMinUndequeuedBuffers-int(mSynchronousMode))) {
ST_LOGE("dequeueBuffer: mMinUndequeuedBuffers=%d exceeded "
"(dequeued=%d)",
@ -560,9 +557,9 @@ status_t BufferQueue::queueBuffer(int buf,
ST_LOGE("queueBuffer: SurfaceTexture has been abandoned!");
return NO_INIT;
}
if (buf < 0 || buf >= mBufferCount) {
if (buf < 0 || buf >= mMaxBufferCount) {
ST_LOGE("queueBuffer: slot index out of range [0, %d]: %d",
mBufferCount, buf);
mMaxBufferCount, buf);
return -EINVAL;
} else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
ST_LOGE("queueBuffer: slot %d is not owned by the client "
@ -656,9 +653,9 @@ void BufferQueue::cancelBuffer(int buf, sp<Fence> fence) {
return;
}
if (buf < 0 || buf >= mBufferCount) {
if (buf < 0 || buf >= mMaxBufferCount) {
ST_LOGE("cancelBuffer: slot index out of range [0, %d]: %d",
mBufferCount, buf);
mMaxBufferCount, buf);
return;
} else if (mSlots[buf].mBufferState != BufferSlot::DEQUEUED) {
ST_LOGE("cancelBuffer: slot %d is not owned by the client (state=%d)",
@ -779,9 +776,9 @@ void BufferQueue::dump(String8& result, const char* prefix,
}
snprintf(buffer, SIZE,
"%s-BufferQueue mBufferCount=%d, mSynchronousMode=%d, default-size=[%dx%d], "
"%s-BufferQueue mMaxBufferCount=%d, mSynchronousMode=%d, default-size=[%dx%d], "
"default-format=%d, FIFO(%d)={%s}\n",
prefix, mBufferCount, mSynchronousMode, mDefaultWidth,
prefix, mMaxBufferCount, mSynchronousMode, mDefaultWidth,
mDefaultHeight, mDefaultBufferFormat, fifoSize, fifo.string());
result.append(buffer);
@ -798,7 +795,7 @@ void BufferQueue::dump(String8& result, const char* prefix,
}
} stateName;
for (int i=0 ; i<mBufferCount ; i++) {
for (int i=0 ; i<mMaxBufferCount ; i++) {
const BufferSlot& slot(mSlots[i]);
snprintf(buffer, SIZE,
"%s%s[%02d] "
@ -991,10 +988,10 @@ status_t BufferQueue::setDefaultBufferSize(uint32_t w, uint32_t h)
return OK;
}
status_t BufferQueue::setBufferCountServer(int bufferCount) {
status_t BufferQueue::setDefaultMaxBufferCount(int bufferCount) {
ATRACE_CALL();
Mutex::Autolock lock(mMutex);
return setBufferCountServerLocked(bufferCount);
return setDefaultMaxBufferCountLocked(bufferCount);
}
void BufferQueue::freeAllBuffersExceptHeadLocked() {
@ -1038,6 +1035,10 @@ status_t BufferQueue::drainQueueAndFreeBuffersLocked() {
return err;
}
int BufferQueue::getMinMaxBufferCountLocked() const {
return mSynchronousMode ? mMinUndequeuedBuffers : mMinUndequeuedBuffers + 1;
}
BufferQueue::ProxyConsumerListener::ProxyConsumerListener(
const wp<BufferQueue::ConsumerListener>& consumerListener):
mConsumerListener(consumerListener) {}

4
libs/gui/SurfaceTexture.cpp
View File

@ -125,9 +125,9 @@ SurfaceTexture::SurfaceTexture(GLuint tex, bool allowSynchronousMode,
mBufferQueue->setConsumerUsageBits(DEFAULT_USAGE_FLAGS);
}
status_t SurfaceTexture::setBufferCountServer(int bufferCount) {
status_t SurfaceTexture::setDefaultMaxBufferCount(int bufferCount) {
Mutex::Autolock lock(mMutex);
return mBufferQueue->setBufferCountServer(bufferCount);
return mBufferQueue->setDefaultMaxBufferCount(bufferCount);
}

12
libs/gui/tests/SurfaceTexture_test.cpp
View File

@ -848,7 +848,7 @@ TEST_F(SurfaceTextureGLTest, TexturingFromCpuFilledYV12BuffersRepeatedly) {
enum { numFrames = 1024 };
ASSERT_EQ(NO_ERROR, mST->setSynchronousMode(true));
ASSERT_EQ(NO_ERROR, mST->setBufferCountServer(2));
ASSERT_EQ(NO_ERROR, mST->setDefaultMaxBufferCount(2));
ASSERT_EQ(NO_ERROR, native_window_set_buffers_geometry(mANW.get(),
texWidth, texHeight, HAL_PIXEL_FORMAT_YV12));
ASSERT_EQ(NO_ERROR, native_window_set_usage(mANW.get(),
@ -1321,7 +1321,7 @@ TEST_F(SurfaceTextureGLTest, AbandonUnblocksDequeueBuffer) {
};
ASSERT_EQ(OK, mST->setSynchronousMode(true));
ASSERT_EQ(OK, mST->setBufferCountServer(2));
ASSERT_EQ(OK, mST->setDefaultMaxBufferCount(2));
sp<Thread> pt(new ProducerThread(mANW));
pt->run();
@ -1584,7 +1584,7 @@ TEST_F(SurfaceTextureGLToGLTest, EglDestroySurfaceAfterAbandonUnrefsBuffers) {
TEST_F(SurfaceTextureGLToGLTest, EglSurfaceDefaultsToSynchronousMode) {
// This test requires 3 buffers to run on a single thread.
mST->setBufferCountServer(3);
mST->setDefaultMaxBufferCount(3);
ASSERT_TRUE(mST->isSynchronousMode());
@ -2045,7 +2045,7 @@ TEST_F(SurfaceTextureGLThreadToGLTest,
};
ASSERT_EQ(OK, mST->setSynchronousMode(true));
ASSERT_EQ(OK, mST->setBufferCountServer(2));
ASSERT_EQ(OK, mST->setDefaultMaxBufferCount(2));
runProducerThread(new PT());
@ -2059,7 +2059,7 @@ TEST_F(SurfaceTextureGLThreadToGLTest,
// We must call updateTexImage to consume the first frame so that the
// SurfaceTexture is able to reduce the buffer count to 2. This is because
// the GL driver may dequeue a buffer when the EGLSurface is created, and
// that happens before we call setBufferCountServer. It's possible that the
// that happens before we call setDefaultMaxBufferCount. It's possible that the
// driver does not dequeue a buffer at EGLSurface creation time, so we
// cannot rely on this to cause the second dequeueBuffer call to block.
mST->updateTexImage();
@ -2586,7 +2586,7 @@ TEST_F(SurfaceTextureMultiContextGLTest,
TEST_F(SurfaceTextureMultiContextGLTest,
UpdateTexImageSucceedsForBufferConsumedBeforeDetach) {
ASSERT_EQ(NO_ERROR, mST->setSynchronousMode(true));
ASSERT_EQ(NO_ERROR, mST->setBufferCountServer(2));
ASSERT_EQ(NO_ERROR, mST->setDefaultMaxBufferCount(2));
// produce two frames and consume them both on the primary context
ASSERT_NO_FATAL_FAILURE(produceOneRGBA8Frame(mANW));

2
services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
View File

@ -93,7 +93,7 @@ FramebufferSurface::FramebufferSurface():
mBufferQueue->setDefaultBufferFormat(fbDev->format);
mBufferQueue->setDefaultBufferSize(fbDev->width, fbDev->height);
mBufferQueue->setSynchronousMode(true);
mBufferQueue->setBufferCountServer(NUM_FRAME_BUFFERS);
mBufferQueue->setDefaultMaxBufferCount(NUM_FRAME_BUFFERS);
} else {
ALOGE("Couldn't get gralloc module");
}

4
services/surfaceflinger/Layer.cpp
View File

@ -104,9 +104,9 @@ void Layer::onFirstRef()
#ifdef TARGET_DISABLE_TRIPLE_BUFFERING
#warning "disabling triple buffering"
mSurfaceTexture->setBufferCountServer(2);
mSurfaceTexture->setDefaultMaxBufferCount(2);
#else
mSurfaceTexture->setBufferCountServer(3);
mSurfaceTexture->setDefaultMaxBufferCount(3);
#endif
}