344 lines
14 KiB
C++
344 lines
14 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 <gui/ISurfaceTexture.h>
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#include <surfaceflinger/IGraphicBufferAlloc.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 {
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MIN_ASYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS + 1,
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MIN_SYNC_BUFFER_SLOTS = MIN_UNDEQUEUED_BUFFERS
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};
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enum { NUM_BUFFER_SLOTS = 32 };
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enum { NO_CONNECTED_API = 0 };
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struct FrameAvailableListener : public virtual RefBase {
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// onFrameAvailable() is called from queueBuffer() each time an
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// additional frame becomes available for consumption. This means that
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// frames that are queued while in asynchronous mode only trigger the
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// callback if no previous frames are pending. Frames queued while in
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// synchronous mode 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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};
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// BufferQueue manages a pool of gralloc memory slots to be used
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// by producers and consumers.
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// allowSynchronousMode specifies whether or not synchronous mode can be
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// enabled.
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BufferQueue(bool allowSynchronousMode = true);
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virtual ~BufferQueue();
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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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// 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, uint32_t width, uint32_t height,
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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, int64_t timestamp,
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uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform);
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virtual void cancelBuffer(int buf);
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virtual status_t setCrop(const Rect& reg);
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virtual status_t setTransform(uint32_t transform);
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virtual status_t setScalingMode(int mode);
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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,
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uint32_t* outWidth, uint32_t* outHeight, uint32_t* outTransform);
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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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protected:
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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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status_t setBufferCountServerLocked(int bufferCount);
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enum { INVALID_BUFFER_SLOT = -1 };
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struct BufferSlot {
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BufferSlot()
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: mEglImage(EGL_NO_IMAGE_KHR),
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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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mFence(EGL_NO_SYNC_KHR) {
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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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// mEglImage is the EGLImage created from mGraphicBuffer.
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EGLImageKHR mEglImage;
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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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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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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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QUEUED = 2,
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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. This gets
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// set to mNextCrop each time queueBuffer gets called for this buffer.
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Rect mCrop;
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// mTransform is the current transform flags for this buffer slot. This
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// gets set to mNextTransform each time queueBuffer gets called for this
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// slot.
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uint32_t mTransform;
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// mScalingMode is the current scaling mode for this buffer slot. This
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// gets set to mNextScalingMode each time queueBuffer gets called for
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// this 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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// mFence 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 mFence;
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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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// mPixelFormat holds the pixel format of allocated buffers. It is used
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// in requestBuffers() if a format of zero is specified.
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uint32_t mPixelFormat;
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// mBufferCount is the number of buffer slots that the client and server
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// must maintain. It defaults to MIN_ASYNC_BUFFER_SLOTS and can be changed
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// by calling setBufferCount or setBufferCountServer
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int mBufferCount;
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// mClientBufferCount is the number of buffer slots requested by the client.
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// The default is zero, which means the client doesn't care how many buffers
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// there is.
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int mClientBufferCount;
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// mServerBufferCount buffer count requested by the server-side
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int mServerBufferCount;
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// mCurrentTexture is the buffer slot index of the buffer that is currently
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// bound to the OpenGL texture. It is initialized to INVALID_BUFFER_SLOT,
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// indicating that no buffer slot is currently bound to the texture. Note,
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// however, that a value of INVALID_BUFFER_SLOT does not necessarily mean
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// that no buffer is bound to the texture. A call to setBufferCount will
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// reset mCurrentTexture to INVALID_BUFFER_SLOT.
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int mCurrentTexture;
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// mNextCrop is the crop rectangle that will be used for the next buffer
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// that gets queued. It is set by calling setCrop.
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Rect mNextCrop;
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// mNextTransform is the transform identifier that will be used for the next
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// buffer that gets queued. It is set by calling setTransform.
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uint32_t mNextTransform;
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// mNextScalingMode is the scaling mode that will be used for the next
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// buffers that get queued. It is set by calling setScalingMode.
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int mNextScalingMode;
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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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// mFrameAvailableListener is the listener object that will be called when a
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// new frame becomes available. If it is not NULL it will be called from
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// queueBuffer.
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sp<FrameAvailableListener> mFrameAvailableListener;
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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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// mConnectedApi indicates the API that is currently connected to this
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// BufferQueue. It defaults to NO_CONNECTED_API (= 0), and gets updated
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// by the connect and disconnect methods.
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int mConnectedApi;
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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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// mAbandoned indicates that the BufferQueue will no longer be used to
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// consume images buffers pushed to it using the ISurfaceTexture interface.
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// It is initialized to false, and set to true in the abandon method. A
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// BufferQueue that has been abandoned will return the NO_INIT error from
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// all ISurfaceTexture methods capable of returning an error.
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bool mAbandoned;
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// mName is a string used to identify the BufferQueue in log messages.
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// It is set by the setName method.
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String8 mName;
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// mMutex is the mutex used to prevent concurrent access to the member
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// variables of BufferQueue objects. It must be locked whenever the
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// member variables are accessed.
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mutable Mutex mMutex;
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// mFrameCounter is the free running counter, incremented for every buffer queued
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// with the surface Texture.
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uint64_t mFrameCounter;
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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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