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Diffstat (limited to 'widget/gonk/nativewindow/GonkBufferQueueJB.h')
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diff --git a/widget/gonk/nativewindow/GonkBufferQueueJB.h b/widget/gonk/nativewindow/GonkBufferQueueJB.h new file mode 100644 index 000000000..df0c4599f --- /dev/null +++ b/widget/gonk/nativewindow/GonkBufferQueueJB.h @@ -0,0 +1,653 @@ +/* + * 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_JB_H +#define NATIVEWINDOW_GONKBUFFERQUEUE_JB_H + +#include <gui/IGraphicBufferAlloc.h> +#if ANDROID_VERSION == 17 +#include <gui/ISurfaceTexture.h> +#else +#include <gui/IGraphicBufferProducer.h> +#endif + +#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" + +#if ANDROID_VERSION == 17 +#define IGraphicBufferProducer ISurfaceTexture +#endif + +namespace android { +// ---------------------------------------------------------------------------- + +#if ANDROID_VERSION == 17 +class GonkBufferQueue : public BnSurfaceTexture { +#else +class GonkBufferQueue : public BnGraphicBufferProducer { +#endif + 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 }; + + // 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 }; + + // ConsumerListener is the interface through which the GonkBufferQueue notifies + // the consumer of events that the consumer may wish to react to. Because + // the consumer will generally have a mutex that is locked during calls from + // the consumer to the GonkBufferQueue, these calls from the GonkBufferQueue to the + // consumer *MUST* be called only when the GonkBufferQueue mutex is NOT locked. + struct ConsumerListener : public virtual RefBase { + // onFrameAvailable is called from queueBuffer each time an additional + // frame becomes available for consumption. This means that frames that + // are queued while in asynchronous mode only trigger the callback if no + // previous frames are pending. Frames queued while in synchronous mode + // always trigger the callback. + // + // This is called without any lock held and can be called concurrently + // by multiple threads. + virtual void onFrameAvailable() = 0; + + // onBuffersReleased is called to notify the buffer consumer that the + // GonkBufferQueue has released its references to one or more GraphicBuffers + // contained in its slots. The buffer consumer should then call + // GonkBufferQueue::getReleasedBuffers to retrieve the list of buffers + // + // This is called without any lock held and can be called concurrently + // by multiple threads. + virtual void onBuffersReleased() = 0; + }; + + // 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 GonkBufferQueue::ConsumerListener { + public: + + ProxyConsumerListener(const wp<GonkBufferQueue::ConsumerListener>& consumerListener); + virtual ~ProxyConsumerListener(); + virtual void onFrameAvailable(); + virtual void onBuffersReleased(); + + private: + + // mConsumerListener is a weak reference to the ConsumerListener. This is + // the raison d'etre of ProxyConsumerListener. + wp<GonkBufferQueue::ConsumerListener> mConsumerListener; + }; + + + // GonkBufferQueue manages a pool of gralloc memory slots to be used by + // producers and consumers. allowSynchronousMode specifies whether or not + // synchronous mode can be enabled by the producer. allocator is used to + // allocate all the needed gralloc buffers. + GonkBufferQueue(bool allowSynchronousMode = true, + const sp<IGraphicBufferAlloc>& allocator = NULL); + virtual ~GonkBufferQueue(); + + // 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. +#if ANDROID_VERSION == 17 + virtual status_t dequeueBuffer(int *buf, sp<Fence>& fence, + uint32_t width, uint32_t height, uint32_t format, uint32_t usage) { + return dequeueBuffer(buf, &fence, width, height, format, usage); + } +#endif + + virtual status_t dequeueBuffer(int *buf, sp<Fence>* fence, + 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. +#if ANDROID_VERSION == 17 + virtual void cancelBuffer(int buf, sp<Fence> fence); +#else + virtual void cancelBuffer(int buf, const sp<Fence>& fence); +#endif + + // 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(int api, 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); + + // dump our state in a String + virtual void dumpToString(String8& result) const; + virtual void dumpToString(String8& result, const char* prefix, char* buffer, size_t SIZE) const; + + // public facing structure for BufferSlot + struct BufferItem { + + BufferItem() + : + mTransform(0), + mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE), + mTimestamp(0), + mFrameNumber(0), + mBuf(INVALID_BUFFER_SLOT) { + mCrop.makeInvalid(); + } + // mGraphicBuffer points to the buffer allocated for this slot, or is NULL + // if the buffer in this slot has been acquired in the past (see + // BufferSlot.mAcquireCalled). + sp<GraphicBuffer> mGraphicBuffer; + + // mCrop is the current crop rectangle for this buffer slot. + Rect mCrop; + + // mTransform is the current transform flags for this buffer slot. + uint32_t mTransform; + + // mScalingMode is the current scaling mode for this buffer slot. + uint32_t mScalingMode; + + // mTimestamp is the current timestamp for this buffer slot. This gets + // to set by queueBuffer each time this slot is queued. + int64_t mTimestamp; + + // mFrameNumber is the number of the queued frame for this slot. + uint64_t mFrameNumber; + + // mBuf is the slot index of this buffer + int mBuf; + + // mFence is a fence that will signal when the buffer is idle. + sp<Fence> mFence; + }; + + // The following public functions are the consumer-facing 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. + status_t acquireBuffer(BufferItem *buffer); + + // 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. + // + // 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. + status_t releaseBuffer(int buf, 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. + // + // consumer may not be NULL. + status_t consumerConnect(const sp<ConsumerListener>& consumer); + + // 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. + 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. + 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. + 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. + status_t setDefaultMaxBufferCount(int bufferCount); + + // 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. + status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers); + + // isSynchronousMode returns whether the GonkBufferQueue is currently in + // synchronous mode. + bool isSynchronousMode() const; + + // setConsumerName sets the name used in logging + 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. + 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. + 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). + status_t setTransformHint(uint32_t hint); + + 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(); + 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); + + // getMinBufferCountLocked returns the minimum number of buffers allowed + // given the current GonkBufferQueue state. + int getMinMaxBufferCountLocked() const; + + // getMinUndequeuedBufferCountLocked returns the minimum number of buffers + // that must remain in a state other than DEQUEUED. + int getMinUndequeuedBufferCountLocked() const; + + // getMaxBufferCountLocked returns the maximum number of buffers that can + // be allocated at once. This value depends upon the following member + // variables: + // + // mSynchronousMode + // mMaxAcquiredBufferCount + // mDefaultMaxBufferCount + // mOverrideMaxBufferCount + // + // Any time one of these member variables is changed while a producer is + // connected, mDequeueCondition must be broadcast. + int getMaxBufferCountLocked() const; + + struct BufferSlot { + + BufferSlot() + : mBufferState(BufferSlot::FREE), + mRequestBufferCalled(false), + mTransform(0), + mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE), + mTimestamp(0), + mFrameNumber(0), + mAcquireCalled(false), + mNeedsCleanupOnRelease(false) { + mCrop.makeInvalid(); + } + + // 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; + + // mCrop is the current crop rectangle for this buffer slot. + Rect mCrop; + + // mTransform is the current transform flags for this buffer slot. + // (example: NATIVE_WINDOW_TRANSFORM_ROT_90) + uint32_t mTransform; + + // mScalingMode is the current scaling mode for this buffer slot. + // (example: NATIVE_WINDOW_SCALING_MODE_FREEZE) + uint32_t mScalingMode; + + // mTimestamp is the current timestamp for this buffer slot. This gets + // to set by queueBuffer each time this slot is queued. + int64_t mTimestamp; + + // 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; + + // mEglFence is the EGL sync object that must signal before the buffer + // associated with this buffer slot may be dequeued. It is initialized + // to EGL_NO_SYNC_KHR when the buffer is created and may be set to a + // new sync object in releaseBuffer. (This is deprecated in favor of + // mFence, below.) + //EGLSyncKHR mEglFence; + + // 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<ConsumerListener> mConsumerListener; + + // mSynchronousMode whether we're in synchronous mode or not + bool mSynchronousMode; + + // mAllowSynchronousMode whether we allow synchronous mode or not. Set + // when the GonkBufferQueue is created (by the consumer). + const bool mAllowSynchronousMode; + + // 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<int> 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. + 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; + +}; + +// ---------------------------------------------------------------------------- +}; // namespace android + +#endif // ANDROID_GUI_BUFFERQUEUE_H |