зеркало из https://github.com/mozilla/gecko-dev.git
90 строки
3.0 KiB
C++
90 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef GFX_TRANSACTION_ID_ALLOCATOR_H
|
|
#define GFX_TRANSACTION_ID_ALLOCATOR_H
|
|
|
|
#include "nsISupportsImpl.h"
|
|
#include "mozilla/layers/LayersTypes.h"
|
|
#include "mozilla/TimeStamp.h"
|
|
|
|
namespace mozilla {
|
|
namespace layers {
|
|
|
|
class TransactionIdAllocator {
|
|
protected:
|
|
virtual ~TransactionIdAllocator() {}
|
|
|
|
public:
|
|
NS_INLINE_DECL_REFCOUNTING(TransactionIdAllocator)
|
|
|
|
/**
|
|
* Allocate a unique id number for the current refresh tick, can
|
|
* only be called while IsInRefresh().
|
|
*
|
|
* If too many id's are allocated without being returned then
|
|
* the refresh driver will suspend until they catch up. This
|
|
* "throttling" behaviour can be skipped by passing aThrottle=false.
|
|
* Otherwise call sites should generally be passing aThrottle=true.
|
|
*/
|
|
virtual TransactionId GetTransactionId(bool aThrottle) = 0;
|
|
|
|
/**
|
|
* Return the transaction id that for the last non-revoked transaction.
|
|
* This allows the caller to tell whether a composite was triggered by
|
|
* a paint that occurred after a call to TransactionId().
|
|
*/
|
|
virtual TransactionId LastTransactionId() const = 0;
|
|
|
|
/**
|
|
* Notify that all work (including asynchronous composites)
|
|
* for a given transaction id has been completed.
|
|
*
|
|
* If the refresh driver has been suspended because
|
|
* of having too many outstanding id's, then this may
|
|
* resume it.
|
|
*/
|
|
virtual void NotifyTransactionCompleted(TransactionId aTransactionId) = 0;
|
|
|
|
/**
|
|
* Revoke a transaction id that isn't needed to track
|
|
* completion of asynchronous work. This is similar
|
|
* to NotifyTransactionCompleted except avoids
|
|
* return ordering issues.
|
|
*/
|
|
virtual void RevokeTransactionId(TransactionId aTransactionId) = 0;
|
|
|
|
/**
|
|
* Stop waiting for pending transactions, if any.
|
|
*
|
|
* This is used when ClientLayerManager is assigning to another refresh
|
|
* driver, and the current refresh driver may never receive transaction
|
|
* completed notifications.
|
|
*/
|
|
virtual void ClearPendingTransactions() = 0;
|
|
|
|
/**
|
|
* Transaction id is usually initialized as 0, however when ClientLayerManager
|
|
* switches to another refresh driver, completed transactions of the previous
|
|
* refresh driver could be delivered and confuse the newly adopted refresh
|
|
* driver. To prevent this situation, use this function to reset transaction
|
|
* id to the last transaction id from previous refresh driver, so that all
|
|
* completed transactions of previous refresh driver will be ignored.
|
|
*/
|
|
virtual void ResetInitialTransactionId(TransactionId aTransactionId) = 0;
|
|
|
|
/**
|
|
* Get the start time of the current refresh tick.
|
|
*/
|
|
virtual mozilla::TimeStamp GetTransactionStart() = 0;
|
|
};
|
|
|
|
} // namespace layers
|
|
} // namespace mozilla
|
|
|
|
|
|
#endif /* GFX_TRANSACTION_ID_ALLOCATOR_H */
|