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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * Copyright (C) 2013 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef NATIVEWINDOW_GONKBUFFERQUEUE_KK_H
+#define NATIVEWINDOW_GONKBUFFERQUEUE_KK_H
+
+#include <gui/IConsumerListener.h>
+#include <gui/IGraphicBufferAlloc.h>
+#include <gui/IGraphicBufferProducer.h>
+#include "IGonkGraphicBufferConsumer.h"
+
+#include <ui/Fence.h>
+#include <ui/GraphicBuffer.h>
+
+#include <utils/String8.h>
+#include <utils/Vector.h>
+#include <utils/threads.h>
+
+#include "mozilla/layers/LayersSurfaces.h"
+#include "mozilla/layers/TextureClient.h"
+
+namespace android {
+// ----------------------------------------------------------------------------
+
+class GonkBufferQueue : public BnGraphicBufferProducer,
+ public BnGonkGraphicBufferConsumer,
+ private IBinder::DeathRecipient
+{
+ typedef mozilla::layers::TextureClient TextureClient;
+
+public:
+ enum { MIN_UNDEQUEUED_BUFFERS = 2 };
+ enum { NUM_BUFFER_SLOTS = 32 };
+ enum { NO_CONNECTED_API = 0 };
+ enum { INVALID_BUFFER_SLOT = -1 };
+ enum { STALE_BUFFER_SLOT = 1, NO_BUFFER_AVAILABLE, PRESENT_LATER };
+
+ // When in async mode we reserve two slots in order to guarantee that the
+ // producer and consumer can run asynchronously.
+ enum { MAX_MAX_ACQUIRED_BUFFERS = NUM_BUFFER_SLOTS - 2 };
+
+ // for backward source compatibility
+ typedef ::android::ConsumerListener ConsumerListener;
+
+ // ProxyConsumerListener is a ConsumerListener implementation that keeps a weak
+ // reference to the actual consumer object. It forwards all calls to that
+ // consumer object so long as it exists.
+ //
+ // This class exists to avoid having a circular reference between the
+ // GonkBufferQueue object and the consumer object. The reason this can't be a weak
+ // reference in the GonkBufferQueue class is because we're planning to expose the
+ // consumer side of a GonkBufferQueue as a binder interface, which doesn't support
+ // weak references.
+ class ProxyConsumerListener : public BnConsumerListener {
+ public:
+ ProxyConsumerListener(const wp<ConsumerListener>& consumerListener);
+ virtual ~ProxyConsumerListener();
+ virtual void onFrameAvailable();
+ virtual void onBuffersReleased();
+ private:
+ // mConsumerListener is a weak reference to the IConsumerListener. This is
+ // the raison d'etre of ProxyConsumerListener.
+ wp<ConsumerListener> mConsumerListener;
+ };
+
+
+ // BufferQueue manages a pool of gralloc memory slots to be used by
+ // producers and consumers. allocator is used to allocate all the
+ // needed gralloc buffers.
+ GonkBufferQueue(bool allowSynchronousMode = true,
+ const sp<IGraphicBufferAlloc>& allocator = NULL);
+ virtual ~GonkBufferQueue();
+
+ /*
+ * IBinder::DeathRecipient interface
+ */
+
+ virtual void binderDied(const wp<IBinder>& who);
+
+ /*
+ * IGraphicBufferProducer interface
+ */
+
+ // Query native window attributes. The "what" values are enumerated in
+ // window.h (e.g. NATIVE_WINDOW_FORMAT).
+ virtual int query(int what, int* value);
+
+ // setBufferCount updates the number of available buffer slots. If this
+ // method succeeds, buffer slots will be both unallocated and owned by
+ // the GonkBufferQueue object (i.e. they are not owned by the producer or
+ // consumer).
+ //
+ // This will fail if the producer has dequeued any buffers, or if
+ // bufferCount is invalid. bufferCount must generally be a value
+ // between the minimum undequeued buffer count and NUM_BUFFER_SLOTS
+ // (inclusive). It may also be set to zero (the default) to indicate
+ // that the producer does not wish to set a value. The minimum value
+ // can be obtained by calling query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS,
+ // ...).
+ //
+ // This may only be called by the producer. The consumer will be told
+ // to discard buffers through the onBuffersReleased callback.
+ virtual status_t setBufferCount(int bufferCount);
+
+ // requestBuffer returns the GraphicBuffer for slot N.
+ //
+ // In normal operation, this is called the first time slot N is returned
+ // by dequeueBuffer. It must be called again if dequeueBuffer returns
+ // flags indicating that previously-returned buffers are no longer valid.
+ virtual status_t requestBuffer(int slot, sp<GraphicBuffer>* buf);
+
+ // dequeueBuffer gets the next buffer slot index for the producer to use.
+ // If a buffer slot is available then that slot index is written to the
+ // location pointed to by the buf argument and a status of OK is returned.
+ // If no slot is available then a status of -EBUSY is returned and buf is
+ // unmodified.
+ //
+ // The fence parameter will be updated to hold the fence associated with
+ // the buffer. The contents of the buffer must not be overwritten until the
+ // fence signals. If the fence is Fence::NO_FENCE, the buffer may be
+ // written immediately.
+ //
+ // The width and height parameters must be no greater than the minimum of
+ // GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv).
+ // An error due to invalid dimensions might not be reported until
+ // updateTexImage() is called. If width and height are both zero, the
+ // default values specified by setDefaultBufferSize() are used instead.
+ //
+ // The pixel formats are enumerated in graphics.h, e.g.
+ // HAL_PIXEL_FORMAT_RGBA_8888. If the format is 0, the default format
+ // will be used.
+ //
+ // The usage argument specifies gralloc buffer usage flags. The values
+ // are enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER. These
+ // will be merged with the usage flags specified by setConsumerUsageBits.
+ //
+ // The return value may be a negative error value or a non-negative
+ // collection of flags. If the flags are set, the return values are
+ // valid, but additional actions must be performed.
+ //
+ // If IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION is set, the
+ // producer must discard cached GraphicBuffer references for the slot
+ // returned in buf.
+ // If IGraphicBufferProducer::RELEASE_ALL_BUFFERS is set, the producer
+ // must discard cached GraphicBuffer references for all slots.
+ //
+ // In both cases, the producer will need to call requestBuffer to get a
+ // GraphicBuffer handle for the returned slot.
+ virtual status_t dequeueBuffer(int *buf, sp<Fence>* fence, bool async,
+ uint32_t width, uint32_t height, uint32_t format, uint32_t usage);
+
+ // queueBuffer returns a filled buffer to the GonkBufferQueue.
+ //
+ // Additional data is provided in the QueueBufferInput struct. Notably,
+ // a timestamp must be provided for the buffer. The timestamp is in
+ // nanoseconds, and must be monotonically increasing. Its other semantics
+ // (zero point, etc) are producer-specific and should be documented by the
+ // producer.
+ //
+ // The caller may provide a fence that signals when all rendering
+ // operations have completed. Alternatively, NO_FENCE may be used,
+ // indicating that the buffer is ready immediately.
+ //
+ // Some values are returned in the output struct: the current settings
+ // for default width and height, the current transform hint, and the
+ // number of queued buffers.
+ virtual status_t queueBuffer(int buf,
+ const QueueBufferInput& input, QueueBufferOutput* output);
+
+ // cancelBuffer returns a dequeued buffer to the GonkBufferQueue, but doesn't
+ // queue it for use by the consumer.
+ //
+ // The buffer will not be overwritten until the fence signals. The fence
+ // will usually be the one obtained from dequeueBuffer.
+ virtual void cancelBuffer(int buf, const sp<Fence>& fence);
+
+ // setSynchronousMode sets whether dequeueBuffer is synchronous or
+ // asynchronous. In synchronous mode, dequeueBuffer blocks until
+ // a buffer is available, the currently bound buffer can be dequeued and
+ // queued buffers will be acquired in order. In asynchronous mode,
+ // a queued buffer may be replaced by a subsequently queued buffer.
+ //
+ // The default mode is synchronous.
+ // This should be called only during initialization.
+ virtual status_t setSynchronousMode(bool enabled);
+
+ // connect attempts to connect a producer API to the GonkBufferQueue. This
+ // must be called before any other IGraphicBufferProducer methods are
+ // called except for getAllocator. A consumer must already be connected.
+ //
+ // This method will fail if connect was previously called on the
+ // GonkBufferQueue and no corresponding disconnect call was made (i.e. if
+ // it's still connected to a producer).
+ //
+ // APIs are enumerated in window.h (e.g. NATIVE_WINDOW_API_CPU).
+ virtual status_t connect(const sp<IBinder>& token,
+ int api, bool producerControlledByApp, QueueBufferOutput* output);
+
+ // disconnect attempts to disconnect a producer API from the GonkBufferQueue.
+ // Calling this method will cause any subsequent calls to other
+ // IGraphicBufferProducer methods to fail except for getAllocator and connect.
+ // Successfully calling connect after this will allow the other methods to
+ // succeed again.
+ //
+ // This method will fail if the the GonkBufferQueue is not currently
+ // connected to the specified producer API.
+ virtual status_t disconnect(int api);
+
+ /*
+ * IGraphicBufferConsumer interface
+ */
+
+ // acquireBuffer attempts to acquire ownership of the next pending buffer in
+ // the GonkBufferQueue. If no buffer is pending then it returns -EINVAL. If a
+ // buffer is successfully acquired, the information about the buffer is
+ // returned in BufferItem. If the buffer returned had previously been
+ // acquired then the BufferItem::mGraphicBuffer field of buffer is set to
+ // NULL and it is assumed that the consumer still holds a reference to the
+ // buffer.
+ //
+ // If presentWhen is nonzero, it indicates the time when the buffer will
+ // be displayed on screen. If the buffer's timestamp is farther in the
+ // future, the buffer won't be acquired, and PRESENT_LATER will be
+ // returned. The presentation time is in nanoseconds, and the time base
+ // is CLOCK_MONOTONIC.
+ virtual status_t acquireBuffer(BufferItem *buffer, nsecs_t presentWhen);
+
+ // releaseBuffer releases a buffer slot from the consumer back to the
+ // GonkBufferQueue. This may be done while the buffer's contents are still
+ // being accessed. The fence will signal when the buffer is no longer
+ // in use. frameNumber is used to indentify the exact buffer returned.
+ //
+ // If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free
+ // any references to the just-released buffer that it might have, as if it
+ // had received a onBuffersReleased() call with a mask set for the released
+ // buffer.
+ //
+ // Note that the dependencies on EGL will be removed once we switch to using
+ // the Android HW Sync HAL.
+ virtual status_t releaseBuffer(int buf, uint64_t frameNumber,
+ const sp<Fence>& releaseFence);
+
+ // consumerConnect connects a consumer to the GonkBufferQueue. Only one
+ // consumer may be connected, and when that consumer disconnects the
+ // GonkBufferQueue is placed into the "abandoned" state, causing most
+ // interactions with the GonkBufferQueue by the producer to fail.
+ // controlledByApp indicates whether the consumer is controlled by
+ // the application.
+ //
+ // consumer may not be NULL.
+ virtual status_t consumerConnect(const sp<IConsumerListener>& consumer, bool controlledByApp);
+
+ // consumerDisconnect disconnects a consumer from the GonkBufferQueue. All
+ // buffers will be freed and the GonkBufferQueue is placed in the "abandoned"
+ // state, causing most interactions with the GonkBufferQueue by the producer to
+ // fail.
+ virtual status_t consumerDisconnect();
+
+ // getReleasedBuffers sets the value pointed to by slotMask to a bit mask
+ // indicating which buffer slots have been released by the GonkBufferQueue
+ // but have not yet been released by the consumer.
+ //
+ // This should be called from the onBuffersReleased() callback.
+ virtual status_t getReleasedBuffers(uint32_t* slotMask);
+
+ // setDefaultBufferSize is used to set the size of buffers returned by
+ // dequeueBuffer when a width and height of zero is requested. Default
+ // is 1x1.
+ virtual status_t setDefaultBufferSize(uint32_t w, uint32_t h);
+
+ // setDefaultMaxBufferCount sets the default value for the maximum buffer
+ // count (the initial default is 2). If the producer has requested a
+ // buffer count using setBufferCount, the default buffer count will only
+ // take effect if the producer sets the count back to zero.
+ //
+ // The count must be between 2 and NUM_BUFFER_SLOTS, inclusive.
+ virtual status_t setDefaultMaxBufferCount(int bufferCount);
+
+ // disableAsyncBuffer disables the extra buffer used in async mode
+ // (when both producer and consumer have set their "isControlledByApp"
+ // flag) and has dequeueBuffer() return WOULD_BLOCK instead.
+ //
+ // This can only be called before consumerConnect().
+ virtual status_t disableAsyncBuffer();
+
+ // setMaxAcquiredBufferCount sets the maximum number of buffers that can
+ // be acquired by the consumer at one time (default 1). This call will
+ // fail if a producer is connected to the GonkBufferQueue.
+ virtual status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers);
+
+ // setConsumerName sets the name used in logging
+ virtual void setConsumerName(const String8& name);
+
+ // setDefaultBufferFormat allows the GonkBufferQueue to create
+ // GraphicBuffers of a defaultFormat if no format is specified
+ // in dequeueBuffer. Formats are enumerated in graphics.h; the
+ // initial default is HAL_PIXEL_FORMAT_RGBA_8888.
+ virtual status_t setDefaultBufferFormat(uint32_t defaultFormat);
+
+ // setConsumerUsageBits will turn on additional usage bits for dequeueBuffer.
+ // These are merged with the bits passed to dequeueBuffer. The values are
+ // enumerated in gralloc.h, e.g. GRALLOC_USAGE_HW_RENDER; the default is 0.
+ virtual status_t setConsumerUsageBits(uint32_t usage);
+
+ // setTransformHint bakes in rotation to buffers so overlays can be used.
+ // The values are enumerated in window.h, e.g.
+ // NATIVE_WINDOW_TRANSFORM_ROT_90. The default is 0 (no transform).
+ virtual status_t setTransformHint(uint32_t hint);
+
+ // dump our state in a String
+ virtual void dumpToString(String8& result, const char* prefix) const;
+
+ already_AddRefed<TextureClient> getTextureClientFromBuffer(ANativeWindowBuffer* buffer);
+
+ int getSlotFromTextureClientLocked(TextureClient* client) const;
+
+private:
+ // freeBufferLocked frees the GraphicBuffer and sync resources for the
+ // given slot.
+ //void freeBufferLocked(int index);
+
+ // freeAllBuffersLocked frees the GraphicBuffer and sync resources for
+ // all slots.
+ void freeAllBuffersLocked();
+
+ // setDefaultMaxBufferCountLocked sets the maximum number of buffer slots
+ // that will be used if the producer does not override the buffer slot
+ // count. The count must be between 2 and NUM_BUFFER_SLOTS, inclusive.
+ // The initial default is 2.
+ status_t setDefaultMaxBufferCountLocked(int count);
+
+ // getMinUndequeuedBufferCount returns the minimum number of buffers
+ // that must remain in a state other than DEQUEUED.
+ // The async parameter tells whether we're in asynchronous mode.
+ int getMinUndequeuedBufferCount(bool async) const;
+
+ // getMinBufferCountLocked returns the minimum number of buffers allowed
+ // given the current GonkBufferQueue state.
+ // The async parameter tells whether we're in asynchronous mode.
+ int getMinMaxBufferCountLocked(bool async) const;
+
+ // getMaxBufferCountLocked returns the maximum number of buffers that can
+ // be allocated at once. This value depends upon the following member
+ // variables:
+ //
+ // mDequeueBufferCannotBlock
+ // mMaxAcquiredBufferCount
+ // mDefaultMaxBufferCount
+ // mOverrideMaxBufferCount
+ // async parameter
+ //
+ // Any time one of these member variables is changed while a producer is
+ // connected, mDequeueCondition must be broadcast.
+ int getMaxBufferCountLocked(bool async) const;
+
+ // stillTracking returns true iff the buffer item is still being tracked
+ // in one of the slots.
+ bool stillTracking(const BufferItem *item) const;
+
+ struct BufferSlot {
+
+ BufferSlot()
+ : mBufferState(BufferSlot::FREE),
+ mRequestBufferCalled(false),
+ mFrameNumber(0),
+ mAcquireCalled(false),
+ mNeedsCleanupOnRelease(false) {
+ }
+
+ // mGraphicBuffer points to the buffer allocated for this slot or is NULL
+ // if no buffer has been allocated.
+ sp<GraphicBuffer> mGraphicBuffer;
+
+ // mTextureClient is a thin abstraction over remotely allocated GraphicBuffer.
+ RefPtr<TextureClient> mTextureClient;
+
+ // BufferState represents the different states in which a buffer slot
+ // can be. All slots are initially FREE.
+ enum BufferState {
+ // FREE indicates that the buffer is available to be dequeued
+ // by the producer. The buffer may be in use by the consumer for
+ // a finite time, so the buffer must not be modified until the
+ // associated fence is signaled.
+ //
+ // The slot is "owned" by GonkBufferQueue. It transitions to DEQUEUED
+ // when dequeueBuffer is called.
+ FREE = 0,
+
+ // DEQUEUED indicates that the buffer has been dequeued by the
+ // producer, but has not yet been queued or canceled. The
+ // producer may modify the buffer's contents as soon as the
+ // associated ready fence is signaled.
+ //
+ // The slot is "owned" by the producer. It can transition to
+ // QUEUED (via queueBuffer) or back to FREE (via cancelBuffer).
+ DEQUEUED = 1,
+
+ // QUEUED indicates that the buffer has been filled by the
+ // producer and queued for use by the consumer. The buffer
+ // contents may continue to be modified for a finite time, so
+ // the contents must not be accessed until the associated fence
+ // is signaled.
+ //
+ // The slot is "owned" by GonkBufferQueue. It can transition to
+ // ACQUIRED (via acquireBuffer) or to FREE (if another buffer is
+ // queued in asynchronous mode).
+ QUEUED = 2,
+
+ // ACQUIRED indicates that the buffer has been acquired by the
+ // consumer. As with QUEUED, the contents must not be accessed
+ // by the consumer until the fence is signaled.
+ //
+ // The slot is "owned" by the consumer. It transitions to FREE
+ // when releaseBuffer is called.
+ ACQUIRED = 3
+ };
+
+ // mBufferState is the current state of this buffer slot.
+ BufferState mBufferState;
+
+ // mRequestBufferCalled is used for validating that the producer did
+ // call requestBuffer() when told to do so. Technically this is not
+ // needed but useful for debugging and catching producer bugs.
+ bool mRequestBufferCalled;
+
+ // mFrameNumber is the number of the queued frame for this slot. This
+ // is used to dequeue buffers in LRU order (useful because buffers
+ // may be released before their release fence is signaled).
+ uint64_t mFrameNumber;
+
+ // mFence is a fence which will signal when work initiated by the
+ // previous owner of the buffer is finished. When the buffer is FREE,
+ // the fence indicates when the consumer has finished reading
+ // from the buffer, or when the producer has finished writing if it
+ // called cancelBuffer after queueing some writes. When the buffer is
+ // QUEUED, it indicates when the producer has finished filling the
+ // buffer. When the buffer is DEQUEUED or ACQUIRED, the fence has been
+ // passed to the consumer or producer along with ownership of the
+ // buffer, and mFence is set to NO_FENCE.
+ sp<Fence> mFence;
+
+ // Indicates whether this buffer has been seen by a consumer yet
+ bool mAcquireCalled;
+
+ // Indicates whether this buffer needs to be cleaned up by the
+ // consumer. This is set when a buffer in ACQUIRED state is freed.
+ // It causes releaseBuffer to return STALE_BUFFER_SLOT.
+ bool mNeedsCleanupOnRelease;
+ };
+
+ // mSlots is the array of buffer slots that must be mirrored on the
+ // producer side. This allows buffer ownership to be transferred between
+ // the producer and consumer without sending a GraphicBuffer over binder.
+ // The entire array is initialized to NULL at construction time, and
+ // buffers are allocated for a slot when requestBuffer is called with
+ // that slot's index.
+ BufferSlot mSlots[NUM_BUFFER_SLOTS];
+
+ // mDefaultWidth holds the default width of allocated buffers. It is used
+ // in dequeueBuffer() if a width and height of zero is specified.
+ uint32_t mDefaultWidth;
+
+ // mDefaultHeight holds the default height of allocated buffers. It is used
+ // in dequeueBuffer() if a width and height of zero is specified.
+ uint32_t mDefaultHeight;
+
+ // mMaxAcquiredBufferCount is the number of buffers that the consumer may
+ // acquire at one time. It defaults to 1 and can be changed by the
+ // consumer via the setMaxAcquiredBufferCount method, but this may only be
+ // done when no producer is connected to the GonkBufferQueue.
+ //
+ // This value is used to derive the value returned for the
+ // MIN_UNDEQUEUED_BUFFERS query by the producer.
+ int mMaxAcquiredBufferCount;
+
+ // 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;
+
+ // 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.
+ sp<IGraphicBufferAlloc> mGraphicBufferAlloc;
+
+ // mConsumerListener is used to notify the connected consumer of
+ // asynchronous events that it may wish to react to. It is initially set
+ // to NULL and is written by consumerConnect and consumerDisconnect.
+ sp<IConsumerListener> mConsumerListener;
+
+ // mSynchronousMode whether we're in synchronous mode or not
+ bool mSynchronousMode;
+
+ // mConsumerControlledByApp whether the connected consumer is controlled by the
+ // application.
+ bool mConsumerControlledByApp;
+
+ // mDequeueBufferCannotBlock whether dequeueBuffer() isn't allowed to block.
+ // this flag is set during connect() when both consumer and producer are controlled
+ // by the application.
+ bool mDequeueBufferCannotBlock;
+
+ // mUseAsyncBuffer whether an extra buffer is used in async mode to prevent
+ // dequeueBuffer() from ever blocking.
+ bool mUseAsyncBuffer;
+
+ // mConnectedApi indicates the producer API that is currently connected
+ // to this GonkBufferQueue. It defaults to NO_CONNECTED_API (= 0), and gets
+ // updated by the connect and disconnect methods.
+ int mConnectedApi;
+
+ // mDequeueCondition condition used for dequeueBuffer in synchronous mode
+ mutable Condition mDequeueCondition;
+
+ // mQueue is a FIFO of queued buffers used in synchronous mode
+ typedef Vector<BufferItem> Fifo;
+ Fifo mQueue;
+
+ // mAbandoned indicates that the GonkBufferQueue will no longer be used to
+ // consume image buffers pushed to it using the IGraphicBufferProducer
+ // interface. It is initialized to false, and set to true in the
+ // consumerDisconnect method. A GonkBufferQueue that has been abandoned will
+ // return the NO_INIT error from all IGraphicBufferProducer methods
+ // capable of returning an error.
+ bool mAbandoned;
+
+ // mConsumerName is a string used to identify the GonkBufferQueue in log
+ // messages. It is set by the setConsumerName method.
+ String8 mConsumerName;
+
+ // mMutex is the mutex used to prevent concurrent access to the member
+ // variables of GonkBufferQueue objects. It must be locked whenever the
+ // member variables are accessed.
+ mutable Mutex mMutex;
+
+ // mFrameCounter is the free running counter, incremented on every
+ // successful queueBuffer call, and buffer allocation.
+ uint64_t mFrameCounter;
+
+ // mBufferHasBeenQueued is true once a buffer has been queued. It is
+ // reset when something causes all buffers to be freed (e.g. changing the
+ // buffer count).
+ bool mBufferHasBeenQueued;
+
+ // mDefaultBufferFormat can be set so it will override
+ // the buffer format when it isn't specified in dequeueBuffer
+ uint32_t mDefaultBufferFormat;
+
+ // mConsumerUsageBits contains flags the consumer wants for GraphicBuffers
+ uint32_t mConsumerUsageBits;
+
+ // mTransformHint is used to optimize for screen rotations
+ uint32_t mTransformHint;
+
+ // mConnectedProducerToken is used to set a binder death notification on the producer
+ sp<IBinder> mConnectedProducerToken;
+};
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_GUI_BUFFERQUEUE_H