bf974abe92
Rearranges updateTexImage() so that the SurfaceFlinger-specific behavior is in a new SurfaceFlingerConsumer subclass. SurfaceTexture behavior should not be altered. Instead of acquire-bind-release we now do acquire-release-bind, but since it's all done with the lock held there shouldn't be any externally-visible change. Change-Id: Ia566e4727945e2cfb9359fc6d2a8f8af64d7b7b7
547 lines
24 KiB
C++
547 lines
24 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_BUFFERQUEUE_H
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#define ANDROID_GUI_BUFFERQUEUE_H
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <gui/IGraphicBufferAlloc.h>
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#include <gui/ISurfaceTexture.h>
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#include <ui/Fence.h>
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#include <ui/GraphicBuffer.h>
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#include <utils/String8.h>
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#include <utils/Vector.h>
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#include <utils/threads.h>
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namespace android {
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// ----------------------------------------------------------------------------
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class BufferQueue : public BnSurfaceTexture {
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public:
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enum { MIN_UNDEQUEUED_BUFFERS = 2 };
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enum { NUM_BUFFER_SLOTS = 32 };
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enum { NO_CONNECTED_API = 0 };
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enum { INVALID_BUFFER_SLOT = -1 };
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enum { STALE_BUFFER_SLOT = 1, NO_BUFFER_AVAILABLE };
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// When in async mode we reserve two slots in order to guarantee that the
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// producer and consumer can run asynchronously.
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enum { MAX_MAX_ACQUIRED_BUFFERS = NUM_BUFFER_SLOTS - 2 };
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// ConsumerListener is the interface through which the BufferQueue notifies
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// the consumer of events that the consumer may wish to react to. Because
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// the consumer will generally have a mutex that is locked during calls from
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// teh consumer to the BufferQueue, these calls from the BufferQueue to the
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// consumer *MUST* be called only when the BufferQueue mutex is NOT locked.
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struct ConsumerListener : public virtual RefBase {
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// onFrameAvailable is called from queueBuffer each time an additional
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// frame becomes available for consumption. This means that frames that
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// are queued while in asynchronous mode only trigger the callback if no
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// previous frames are pending. Frames queued while in synchronous mode
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// always trigger the callback.
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//
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// This is called without any lock held and can be called concurrently
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// by multiple threads.
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virtual void onFrameAvailable() = 0;
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// onBuffersReleased is called to notify the buffer consumer that the
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// BufferQueue has released its references to one or more GraphicBuffers
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// contained in its slots. The buffer consumer should then call
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// BufferQueue::getReleasedBuffers to retrieve the list of buffers
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//
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// This is called without any lock held and can be called concurrently
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// by multiple threads.
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virtual void onBuffersReleased() = 0;
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};
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// ProxyConsumerListener is a ConsumerListener implementation that keeps a weak
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// reference to the actual consumer object. It forwards all calls to that
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// consumer object so long as it exists.
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//
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// This class exists to avoid having a circular reference between the
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// BufferQueue object and the consumer object. The reason this can't be a weak
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// reference in the BufferQueue class is because we're planning to expose the
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// consumer side of a BufferQueue as a binder interface, which doesn't support
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// weak references.
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class ProxyConsumerListener : public BufferQueue::ConsumerListener {
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public:
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ProxyConsumerListener(const wp<BufferQueue::ConsumerListener>& consumerListener);
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virtual ~ProxyConsumerListener();
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virtual void onFrameAvailable();
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virtual void onBuffersReleased();
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private:
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// mConsumerListener is a weak reference to the ConsumerListener. This is
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// the raison d'etre of ProxyConsumerListener.
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wp<BufferQueue::ConsumerListener> mConsumerListener;
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};
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// BufferQueue manages a pool of gralloc memory slots to be used by
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// producers and consumers. allowSynchronousMode specifies whether or not
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// synchronous mode can be enabled by the producer. allocator is used to
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// allocate all the needed gralloc buffers.
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BufferQueue(bool allowSynchronousMode = true,
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const sp<IGraphicBufferAlloc>& allocator = NULL);
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virtual ~BufferQueue();
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virtual int query(int what, int* value);
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// setBufferCount updates the number of available buffer slots. After
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// calling this all buffer slots are both unallocated and owned by the
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// BufferQueue object (i.e. they are not owned by the client).
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virtual status_t setBufferCount(int bufferCount);
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virtual status_t requestBuffer(int slot, sp<GraphicBuffer>* buf);
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// dequeueBuffer gets the next buffer slot index for the client to use. If a
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// buffer slot is available then that slot index is written to the location
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// pointed to by the buf argument and a status of OK is returned. If no
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// slot is available then a status of -EBUSY is returned and buf is
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// unmodified.
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//
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// The fence parameter will be updated to hold the fence associated with
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// the buffer. The contents of the buffer must not be overwritten until the
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// fence signals. If the fence is NULL, the buffer may be written
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// immediately.
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//
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// The width and height parameters must be no greater than the minimum of
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// GL_MAX_VIEWPORT_DIMS and GL_MAX_TEXTURE_SIZE (see: glGetIntegerv).
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// An error due to invalid dimensions might not be reported until
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// updateTexImage() is called.
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virtual status_t dequeueBuffer(int *buf, sp<Fence>& fence,
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uint32_t width, uint32_t height, uint32_t format, uint32_t usage);
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// queueBuffer returns a filled buffer to the BufferQueue. In addition, a
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// timestamp must be provided for the buffer. The timestamp is in
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// nanoseconds, and must be monotonically increasing. Its other semantics
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// (zero point, etc) are client-dependent and should be documented by the
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// client.
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virtual status_t queueBuffer(int buf,
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const QueueBufferInput& input, QueueBufferOutput* output);
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virtual void cancelBuffer(int buf, sp<Fence> fence);
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// setSynchronousMode set whether dequeueBuffer is synchronous or
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// asynchronous. In synchronous mode, dequeueBuffer blocks until
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// a buffer is available, the currently bound buffer can be dequeued and
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// queued buffers will be retired in order.
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// The default mode is asynchronous.
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virtual status_t setSynchronousMode(bool enabled);
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// connect attempts to connect a producer client API to the BufferQueue.
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// This must be called before any other ISurfaceTexture methods are called
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// except for getAllocator.
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//
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// This method will fail if the connect was previously called on the
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// BufferQueue and no corresponding disconnect call was made.
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virtual status_t connect(int api, QueueBufferOutput* output);
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// disconnect attempts to disconnect a producer client API from the
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// BufferQueue. Calling this method will cause any subsequent calls to other
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// ISurfaceTexture methods to fail except for getAllocator and connect.
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// Successfully calling connect after this will allow the other methods to
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// succeed again.
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//
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// This method will fail if the the BufferQueue is not currently
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// connected to the specified client API.
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virtual status_t disconnect(int api);
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// dump our state in a String
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virtual void dump(String8& result) const;
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virtual void dump(String8& result, const char* prefix, char* buffer, size_t SIZE) const;
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// public facing structure for BufferSlot
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struct BufferItem {
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BufferItem()
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:
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mTransform(0),
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mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
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mTimestamp(0),
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mFrameNumber(0),
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mBuf(INVALID_BUFFER_SLOT) {
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mCrop.makeInvalid();
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}
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// mGraphicBuffer points to the buffer allocated for this slot, or is NULL
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// if the buffer in this slot has been acquired in the past (see
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// BufferSlot.mAcquireCalled).
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sp<GraphicBuffer> mGraphicBuffer;
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// mCrop is the current crop rectangle for this buffer slot.
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Rect mCrop;
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// mTransform is the current transform flags for this buffer slot.
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uint32_t mTransform;
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// mScalingMode is the current scaling mode for this buffer slot.
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uint32_t mScalingMode;
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// mTimestamp is the current timestamp for this buffer slot. This gets
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// to set by queueBuffer each time this slot is queued.
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int64_t mTimestamp;
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// mFrameNumber is the number of the queued frame for this slot.
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uint64_t mFrameNumber;
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// mBuf is the slot index of this buffer
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int mBuf;
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// mFence is a fence that will signal when the buffer is idle.
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sp<Fence> mFence;
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};
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// The following public functions is the consumer facing interface
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// acquireBuffer attempts to acquire ownership of the next pending buffer in
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// the BufferQueue. If no buffer is pending then it returns -EINVAL. If a
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// buffer is successfully acquired, the information about the buffer is
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// returned in BufferItem. If the buffer returned had previously been
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// acquired then the BufferItem::mGraphicBuffer field of buffer is set to
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// NULL and it is assumed that the consumer still holds a reference to the
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// buffer.
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status_t acquireBuffer(BufferItem *buffer);
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// releaseBuffer releases a buffer slot from the consumer back to the
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// BufferQueue pending a fence sync.
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//
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// If releaseBuffer returns STALE_BUFFER_SLOT, then the consumer must free
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// any references to the just-released buffer that it might have, as if it
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// had received a onBuffersReleased() call with a mask set for the released
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// buffer.
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//
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// Note that the dependencies on EGL will be removed once we switch to using
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// the Android HW Sync HAL.
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status_t releaseBuffer(int buf, EGLDisplay display, EGLSyncKHR fence,
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const sp<Fence>& releaseFence);
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// consumerConnect connects a consumer to the BufferQueue. Only one
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// consumer may be connected, and when that consumer disconnects the
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// BufferQueue is placed into the "abandoned" state, causing most
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// interactions with the BufferQueue by the producer to fail.
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status_t consumerConnect(const sp<ConsumerListener>& consumer);
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// consumerDisconnect disconnects a consumer from the BufferQueue. All
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// buffers will be freed and the BufferQueue is placed in the "abandoned"
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// state, causing most interactions with the BufferQueue by the producer to
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// fail.
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status_t consumerDisconnect();
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// getReleasedBuffers sets the value pointed to by slotMask to a bit mask
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// indicating which buffer slots the have been released by the BufferQueue
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// but have not yet been released by the consumer.
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status_t getReleasedBuffers(uint32_t* slotMask);
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// setDefaultBufferSize is used to set the size of buffers returned by
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// requestBuffers when a with and height of zero is requested.
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status_t setDefaultBufferSize(uint32_t w, uint32_t h);
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// setDefaultBufferCount set the buffer count. If the client has requested
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// a buffer count using setBufferCount, the server-buffer count will
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// take effect once the client sets the count back to zero.
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status_t setDefaultMaxBufferCount(int bufferCount);
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// setMaxAcquiredBufferCount sets the maximum number of buffers that can
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// be acquired by the consumer at one time. This call will fail if a
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// producer is connected to the BufferQueue.
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status_t setMaxAcquiredBufferCount(int maxAcquiredBuffers);
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// isSynchronousMode returns whether the SurfaceTexture is currently in
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// synchronous mode.
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bool isSynchronousMode() const;
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// setConsumerName sets the name used in logging
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void setConsumerName(const String8& name);
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// setDefaultBufferFormat allows the BufferQueue to create
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// GraphicBuffers of a defaultFormat if no format is specified
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// in dequeueBuffer
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status_t setDefaultBufferFormat(uint32_t defaultFormat);
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// setConsumerUsageBits will turn on additional usage bits for dequeueBuffer
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status_t setConsumerUsageBits(uint32_t usage);
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// setTransformHint bakes in rotation to buffers so overlays can be used
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status_t setTransformHint(uint32_t hint);
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private:
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// freeBufferLocked frees the resources (both GraphicBuffer and EGLImage)
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// for the given slot.
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void freeBufferLocked(int index);
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// freeAllBuffersLocked frees the resources (both GraphicBuffer and
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// EGLImage) for all slots.
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void freeAllBuffersLocked();
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// freeAllBuffersExceptHeadLocked frees the resources (both GraphicBuffer
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// and EGLImage) for all slots except the head of mQueue
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void freeAllBuffersExceptHeadLocked();
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// drainQueueLocked drains the buffer queue if we're in synchronous mode
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// returns immediately otherwise. It returns NO_INIT if the BufferQueue
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// became abandoned or disconnected during this call.
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status_t drainQueueLocked();
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// drainQueueAndFreeBuffersLocked drains the buffer queue if we're in
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// synchronous mode and free all buffers. In asynchronous mode, all buffers
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// are freed except the current buffer.
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status_t drainQueueAndFreeBuffersLocked();
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// setDefaultMaxBufferCountLocked sets the maximum number of buffer slots
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// that will be used if the producer does not override the buffer slot
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// count.
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status_t setDefaultMaxBufferCountLocked(int count);
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// getMinBufferCountLocked returns the minimum number of buffers allowed
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// given the current BufferQueue state.
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int getMinMaxBufferCountLocked() const;
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// getMinUndequeuedBufferCountLocked returns the minimum number of buffers
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// that must remain in a state other than DEQUEUED.
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int getMinUndequeuedBufferCountLocked() const;
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// getMaxBufferCountLocked returns the maximum number of buffers that can
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// be allocated at once. This value depends upon the following member
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// variables:
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//
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// mSynchronousMode
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// mMaxAcquiredBufferCount
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// mDefaultMaxBufferCount
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// mOverrideMaxBufferCount
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//
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// Any time one of these member variables is changed while a producer is
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// connected, mDequeueCondition must be broadcast.
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int getMaxBufferCountLocked() const;
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struct BufferSlot {
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BufferSlot()
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: mEglDisplay(EGL_NO_DISPLAY),
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mBufferState(BufferSlot::FREE),
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mRequestBufferCalled(false),
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mTransform(0),
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mScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
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mTimestamp(0),
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mFrameNumber(0),
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mEglFence(EGL_NO_SYNC_KHR),
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mAcquireCalled(false),
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mNeedsCleanupOnRelease(false) {
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mCrop.makeInvalid();
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}
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// mGraphicBuffer points to the buffer allocated for this slot or is NULL
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// if no buffer has been allocated.
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sp<GraphicBuffer> mGraphicBuffer;
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// mEglDisplay is the EGLDisplay used to create mEglImage.
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EGLDisplay mEglDisplay;
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// BufferState represents the different states in which a buffer slot
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// can be.
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enum BufferState {
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// FREE indicates that the buffer is not currently being used and
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// will not be used in the future until it gets dequeued and
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// subsequently queued by the client.
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// aka "owned by BufferQueue, ready to be dequeued"
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FREE = 0,
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// DEQUEUED indicates that the buffer has been dequeued by the
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// client, but has not yet been queued or canceled. The buffer is
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// considered 'owned' by the client, and the server should not use
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// it for anything.
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//
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// Note that when in synchronous-mode (mSynchronousMode == true),
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// the buffer that's currently attached to the texture may be
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// dequeued by the client. That means that the current buffer can
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// be in either the DEQUEUED or QUEUED state. In asynchronous mode,
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// however, the current buffer is always in the QUEUED state.
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// aka "owned by producer, ready to be queued"
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DEQUEUED = 1,
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// QUEUED indicates that the buffer has been queued by the client,
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// and has not since been made available for the client to dequeue.
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// Attaching the buffer to the texture does NOT transition the
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// buffer away from the QUEUED state. However, in Synchronous mode
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// the current buffer may be dequeued by the client under some
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// circumstances. See the note about the current buffer in the
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// documentation for DEQUEUED.
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// aka "owned by BufferQueue, ready to be acquired"
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QUEUED = 2,
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// aka "owned by consumer, ready to be released"
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ACQUIRED = 3
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};
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// mBufferState is the current state of this buffer slot.
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BufferState mBufferState;
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// mRequestBufferCalled is used for validating that the client did
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// call requestBuffer() when told to do so. Technically this is not
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// needed but useful for debugging and catching client bugs.
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bool mRequestBufferCalled;
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// mCrop is the current crop rectangle for this buffer slot.
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Rect mCrop;
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// mTransform is the current transform flags for this buffer slot.
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// (example: NATIVE_WINDOW_TRANSFORM_ROT_90)
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uint32_t mTransform;
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// mScalingMode is the current scaling mode for this buffer slot.
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// (example: NATIVE_WINDOW_SCALING_MODE_FREEZE)
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uint32_t mScalingMode;
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// mTimestamp is the current timestamp for this buffer slot. This gets
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// to set by queueBuffer each time this slot is queued.
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int64_t mTimestamp;
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// mFrameNumber is the number of the queued frame for this slot.
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uint64_t mFrameNumber;
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// mEglFence is the EGL sync object that must signal before the buffer
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// associated with this buffer slot may be dequeued. It is initialized
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// to EGL_NO_SYNC_KHR when the buffer is created and (optionally, based
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// on a compile-time option) set to a new sync object in updateTexImage.
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EGLSyncKHR mEglFence;
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// mFence is a fence which will signal when work initiated by the
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// previous owner of the buffer is finished. When the buffer is FREE,
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// the fence indicates when the consumer has finished reading
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// from the buffer, or when the producer has finished writing if it
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// called cancelBuffer after queueing some writes. When the buffer is
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// QUEUED, it indicates when the producer has finished filling the
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// buffer. When the buffer is DEQUEUED or ACQUIRED, the fence has been
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// passed to the consumer or producer along with ownership of the
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// buffer, and mFence is empty.
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sp<Fence> mFence;
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// Indicates whether this buffer has been seen by a consumer yet
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bool mAcquireCalled;
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// Indicates whether this buffer needs to be cleaned up by consumer
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bool mNeedsCleanupOnRelease;
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};
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// mSlots is the array of buffer slots that must be mirrored on the client
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// side. This allows buffer ownership to be transferred between the client
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// and server without sending a GraphicBuffer over binder. The entire array
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// is initialized to NULL at construction time, and buffers are allocated
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// for a slot when requestBuffer is called with that slot's index.
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BufferSlot mSlots[NUM_BUFFER_SLOTS];
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// mDefaultWidth holds the default width of allocated buffers. It is used
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// in requestBuffers() if a width and height of zero is specified.
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uint32_t mDefaultWidth;
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// mDefaultHeight holds the default height of allocated buffers. It is used
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// in requestBuffers() if a width and height of zero is specified.
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uint32_t mDefaultHeight;
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// mMaxAcquiredBufferCount is the number of buffers that the consumer may
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// acquire at one time. It defaults to 1 and can be changed by the
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// consumer via the setMaxAcquiredBufferCount method, but this may only be
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// done when no producer is connected to the BufferQueue.
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//
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// This value is used to derive the value returned for the
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// MIN_UNDEQUEUED_BUFFERS query by the producer.
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int mMaxAcquiredBufferCount;
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// mDefaultMaxBufferCount is the default limit on the number of buffers
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// that will be allocated at one time. This default limit is set by the
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// consumer. The limit (as opposed to the default limit) may be
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// overridden by the producer.
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int mDefaultMaxBufferCount;
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// mOverrideMaxBufferCount is the limit on the number of buffers that will
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// be allocated at one time. This value is set by the image producer by
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// calling setBufferCount. The default is zero, which means the producer
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// doesn't care about the number of buffers in the pool. In that case
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// mDefaultMaxBufferCount is used as the limit.
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int mOverrideMaxBufferCount;
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// mGraphicBufferAlloc is the connection to SurfaceFlinger that is used to
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// allocate new GraphicBuffer objects.
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sp<IGraphicBufferAlloc> mGraphicBufferAlloc;
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// mConsumerListener is used to notify the connected consumer of
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// asynchronous events that it may wish to react to. It is initially set
|
|
// to NULL and is written by consumerConnect and consumerDisconnect.
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|
sp<ConsumerListener> mConsumerListener;
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// mSynchronousMode whether we're in synchronous mode or not
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|
bool mSynchronousMode;
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// mAllowSynchronousMode whether we allow synchronous mode or not
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|
const bool mAllowSynchronousMode;
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|
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// mConnectedApi indicates the API that is currently connected to this
|
|
// BufferQueue. It defaults to NO_CONNECTED_API (= 0), and gets updated
|
|
// by the connect and disconnect methods.
|
|
int mConnectedApi;
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|
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// mDequeueCondition condition used for dequeueBuffer in synchronous mode
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|
mutable Condition mDequeueCondition;
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|
|
// mQueue is a FIFO of queued buffers used in synchronous mode
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|
typedef Vector<int> Fifo;
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|
Fifo mQueue;
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|
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// mAbandoned indicates that the BufferQueue will no longer be used to
|
|
// consume images buffers pushed to it using the ISurfaceTexture interface.
|
|
// It is initialized to false, and set to true in the abandon method. A
|
|
// BufferQueue that has been abandoned will return the NO_INIT error from
|
|
// all ISurfaceTexture methods capable of returning an error.
|
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bool mAbandoned;
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|
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// mName is a string used to identify the BufferQueue in log messages.
|
|
// It is set by the setName method.
|
|
String8 mConsumerName;
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|
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// mMutex is the mutex used to prevent concurrent access to the member
|
|
// variables of BufferQueue objects. It must be locked whenever the
|
|
// member variables are accessed.
|
|
mutable Mutex mMutex;
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|
|
|
// mFrameCounter is the free running counter, incremented for every buffer queued
|
|
// with the surface Texture.
|
|
uint64_t mFrameCounter;
|
|
|
|
// mBufferHasBeenQueued is true once a buffer has been queued. It is reset
|
|
// by changing the buffer count.
|
|
bool mBufferHasBeenQueued;
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|
|
|
// 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;
|
|
};
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|
|
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_BUFFERQUEUE_H
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