зеркало из https://github.com/mozilla/pjs.git
563 строки
17 KiB
C++
563 строки
17 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsRefreshDriver.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Code to notify things that animate before a refresh, at an appropriate
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* refresh rate. (Perhaps temporary, until replaced by compositor.)
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*/
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#include "mozilla/Util.h"
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#include "nsRefreshDriver.h"
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#include "nsPresContext.h"
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#include "nsComponentManagerUtils.h"
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#include "prlog.h"
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#include "nsAutoPtr.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsIDocument.h"
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#include "nsGUIEvent.h"
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#include "nsEventDispatcher.h"
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#include "jsapi.h"
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#include "nsContentUtils.h"
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#include "mozilla/Preferences.h"
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#include "nsIViewManager.h"
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using mozilla::TimeStamp;
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using mozilla::TimeDuration;
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using namespace mozilla;
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#define DEFAULT_FRAME_RATE 60
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#define DEFAULT_THROTTLED_FRAME_RATE 1
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static bool sPrecisePref;
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/* static */ void
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nsRefreshDriver::InitializeStatics()
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{
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Preferences::AddBoolVarCache(&sPrecisePref,
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"layout.frame_rate.precise",
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false);
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}
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/* static */ PRInt32
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nsRefreshDriver::DefaultInterval()
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{
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return NSToIntRound(1000.0 / DEFAULT_FRAME_RATE);
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}
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// Compute the interval to use for the refresh driver timer, in
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// milliseconds
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PRInt32
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nsRefreshDriver::GetRefreshTimerInterval() const
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{
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const char* prefName =
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mThrottled ? "layout.throttled_frame_rate" : "layout.frame_rate";
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PRInt32 rate = Preferences::GetInt(prefName, -1);
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if (rate <= 0) {
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// TODO: get the rate from the platform
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rate = mThrottled ? DEFAULT_THROTTLED_FRAME_RATE : DEFAULT_FRAME_RATE;
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}
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NS_ASSERTION(rate > 0, "Must have positive rate here");
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PRInt32 interval = NSToIntRound(1000.0/rate);
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if (mThrottled) {
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interval = NS_MAX(interval, mLastTimerInterval * 2);
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}
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mLastTimerInterval = interval;
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return interval;
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}
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PRInt32
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nsRefreshDriver::GetRefreshTimerType() const
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{
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if (mThrottled) {
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return nsITimer::TYPE_ONE_SHOT;
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}
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if (HaveFrameRequestCallbacks() || sPrecisePref) {
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return nsITimer::TYPE_REPEATING_PRECISE_CAN_SKIP;
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}
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return nsITimer::TYPE_REPEATING_SLACK;
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}
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nsRefreshDriver::nsRefreshDriver(nsPresContext *aPresContext)
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: mPresContext(aPresContext),
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mFrozen(false),
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mThrottled(false),
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mTestControllingRefreshes(false),
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mTimerIsPrecise(false),
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mViewManagerFlushIsPending(false),
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mLastTimerInterval(0)
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{
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mRequests.Init();
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}
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nsRefreshDriver::~nsRefreshDriver()
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{
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NS_ABORT_IF_FALSE(ObserverCount() == 0,
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"observers should have unregistered");
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NS_ABORT_IF_FALSE(!mTimer, "timer should be gone");
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}
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// Method for testing. See nsIDOMWindowUtils.advanceTimeAndRefresh
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// for description.
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void
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nsRefreshDriver::AdvanceTimeAndRefresh(PRInt64 aMilliseconds)
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{
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mTestControllingRefreshes = true;
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mMostRecentRefreshEpochTime += aMilliseconds * 1000;
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mMostRecentRefresh += TimeDuration::FromMilliseconds(aMilliseconds);
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nsCxPusher pusher;
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if (pusher.PushNull()) {
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Notify(nsnull);
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pusher.Pop();
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}
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}
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void
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nsRefreshDriver::RestoreNormalRefresh()
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{
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mTestControllingRefreshes = false;
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nsCxPusher pusher;
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if (pusher.PushNull()) {
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Notify(nsnull); // will call UpdateMostRecentRefresh()
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pusher.Pop();
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}
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}
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TimeStamp
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nsRefreshDriver::MostRecentRefresh() const
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{
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const_cast<nsRefreshDriver*>(this)->EnsureTimerStarted(false);
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return mMostRecentRefresh;
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}
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PRInt64
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nsRefreshDriver::MostRecentRefreshEpochTime() const
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{
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const_cast<nsRefreshDriver*>(this)->EnsureTimerStarted(false);
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return mMostRecentRefreshEpochTime;
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}
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bool
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nsRefreshDriver::AddRefreshObserver(nsARefreshObserver *aObserver,
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mozFlushType aFlushType)
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{
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ObserverArray& array = ArrayFor(aFlushType);
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bool success = array.AppendElement(aObserver) != nsnull;
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EnsureTimerStarted(false);
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return success;
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}
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bool
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nsRefreshDriver::RemoveRefreshObserver(nsARefreshObserver *aObserver,
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mozFlushType aFlushType)
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{
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ObserverArray& array = ArrayFor(aFlushType);
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return array.RemoveElement(aObserver);
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}
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bool
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nsRefreshDriver::AddImageRequest(imgIRequest* aRequest)
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{
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if (!mRequests.PutEntry(aRequest)) {
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return false;
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}
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EnsureTimerStarted(false);
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return true;
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}
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void
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nsRefreshDriver::RemoveImageRequest(imgIRequest* aRequest)
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{
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mRequests.RemoveEntry(aRequest);
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}
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void nsRefreshDriver::ClearAllImageRequests()
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{
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mRequests.Clear();
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}
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void
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nsRefreshDriver::EnsureTimerStarted(bool aAdjustingTimer)
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{
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if (mTimer || mFrozen || !mPresContext) {
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// It's already been started, or we don't want to start it now or
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// we've been disconnected.
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return;
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}
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if (!aAdjustingTimer) {
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// If we didn't already have a timer and aAdjustingTimer is false,
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// then we just got our first observer (or an explicit call to
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// MostRecentRefresh by a caller who's likely to add an observer
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// shortly). This means we should fake a most-recent-refresh time
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// of now so that said observer gets a reasonable refresh time, so
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// things behave as though the timer had always been running.
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UpdateMostRecentRefresh();
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}
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mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
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if (!mTimer) {
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return;
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}
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PRInt32 timerType = GetRefreshTimerType();
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mTimerIsPrecise = (timerType == nsITimer::TYPE_REPEATING_PRECISE_CAN_SKIP);
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nsresult rv = mTimer->InitWithCallback(this,
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GetRefreshTimerInterval(),
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timerType);
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if (NS_FAILED(rv)) {
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mTimer = nsnull;
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}
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}
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void
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nsRefreshDriver::StopTimer()
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{
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if (!mTimer) {
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return;
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}
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mTimer->Cancel();
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mTimer = nsnull;
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}
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PRUint32
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nsRefreshDriver::ObserverCount() const
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{
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PRUint32 sum = 0;
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for (PRUint32 i = 0; i < ArrayLength(mObservers); ++i) {
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sum += mObservers[i].Length();
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}
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// Even while throttled, we need to process layout and style changes. Style
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// changes can trigger transitions which fire events when they complete, and
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// layout changes can affect media queries on child documents, triggering
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// style changes, etc.
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sum += mStyleFlushObservers.Length();
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sum += mLayoutFlushObservers.Length();
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sum += mFrameRequestCallbackDocs.Length();
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sum += mViewManagerFlushIsPending;
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return sum;
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}
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PRUint32
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nsRefreshDriver::ImageRequestCount() const
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{
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return mRequests.Count();
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}
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void
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nsRefreshDriver::UpdateMostRecentRefresh()
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{
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if (mTestControllingRefreshes) {
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return;
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}
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// Call JS_Now first, since that can have nonzero latency in some rare cases.
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mMostRecentRefreshEpochTime = JS_Now();
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mMostRecentRefresh = TimeStamp::Now();
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}
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nsRefreshDriver::ObserverArray&
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nsRefreshDriver::ArrayFor(mozFlushType aFlushType)
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{
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switch (aFlushType) {
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case Flush_Style:
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return mObservers[0];
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case Flush_Layout:
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return mObservers[1];
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case Flush_Display:
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return mObservers[2];
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default:
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NS_ABORT_IF_FALSE(false, "bad flush type");
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return *static_cast<ObserverArray*>(nsnull);
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}
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}
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/*
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* nsISupports implementation
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*/
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NS_IMPL_ISUPPORTS1(nsRefreshDriver, nsITimerCallback)
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/*
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* nsITimerCallback implementation
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*/
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NS_IMETHODIMP
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nsRefreshDriver::Notify(nsITimer *aTimer)
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{
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NS_PRECONDITION(!mFrozen, "Why are we notified while frozen?");
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NS_PRECONDITION(mPresContext, "Why are we notified after disconnection?");
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NS_PRECONDITION(!nsContentUtils::GetCurrentJSContext(),
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"Shouldn't have a JSContext on the stack");
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if (mTestControllingRefreshes && aTimer) {
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// Ignore real refreshes from our timer (but honor the others).
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return NS_OK;
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}
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UpdateMostRecentRefresh();
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nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
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if (!presShell || (ObserverCount() == 0 && ImageRequestCount() == 0)) {
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// Things are being destroyed, or we no longer have any observers.
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// We don't want to stop the timer when observers are initially
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// removed, because sometimes observers can be added and removed
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// often depending on what other things are going on and in that
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// situation we don't want to thrash our timer. So instead we
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// wait until we get a Notify() call when we have no observers
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// before stopping the timer.
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StopTimer();
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return NS_OK;
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}
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/*
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* The timer holds a reference to |this| while calling |Notify|.
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* However, implementations of |WillRefresh| are permitted to destroy
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* the pres context, which will cause our |mPresContext| to become
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* null. If this happens, we must stop notifying observers.
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*/
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for (PRUint32 i = 0; i < ArrayLength(mObservers); ++i) {
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ObserverArray::EndLimitedIterator etor(mObservers[i]);
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while (etor.HasMore()) {
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nsRefPtr<nsARefreshObserver> obs = etor.GetNext();
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obs->WillRefresh(mMostRecentRefresh);
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if (!mPresContext || !mPresContext->GetPresShell()) {
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StopTimer();
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return NS_OK;
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}
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}
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if (i == 0) {
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// Grab all of our frame request callbacks up front.
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nsIDocument::FrameRequestCallbackList frameRequestCallbacks;
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for (PRUint32 i = 0; i < mFrameRequestCallbackDocs.Length(); ++i) {
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mFrameRequestCallbackDocs[i]->
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TakeFrameRequestCallbacks(frameRequestCallbacks);
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}
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// OK, now reset mFrameRequestCallbackDocs so they can be
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// readded as needed.
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mFrameRequestCallbackDocs.Clear();
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PRInt64 eventTime = mMostRecentRefreshEpochTime / PR_USEC_PER_MSEC;
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for (PRUint32 i = 0; i < frameRequestCallbacks.Length(); ++i) {
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nsAutoMicroTask mt;
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frameRequestCallbacks[i]->Sample(eventTime);
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}
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// This is the Flush_Style case.
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if (mPresContext && mPresContext->GetPresShell()) {
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nsAutoTArray<nsIPresShell*, 16> observers;
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observers.AppendElements(mStyleFlushObservers);
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for (PRUint32 j = observers.Length();
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j && mPresContext && mPresContext->GetPresShell(); --j) {
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// Make sure to not process observers which might have been removed
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// during previous iterations.
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nsIPresShell* shell = observers[j - 1];
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if (!mStyleFlushObservers.Contains(shell))
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continue;
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NS_ADDREF(shell);
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mStyleFlushObservers.RemoveElement(shell);
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shell->FrameConstructor()->mObservingRefreshDriver = false;
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shell->FlushPendingNotifications(Flush_Style);
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NS_RELEASE(shell);
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}
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}
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} else if (i == 1) {
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// This is the Flush_Layout case.
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if (mPresContext && mPresContext->GetPresShell()) {
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nsAutoTArray<nsIPresShell*, 16> observers;
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observers.AppendElements(mLayoutFlushObservers);
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for (PRUint32 j = observers.Length();
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j && mPresContext && mPresContext->GetPresShell(); --j) {
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// Make sure to not process observers which might have been removed
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// during previous iterations.
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nsIPresShell* shell = observers[j - 1];
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if (!mLayoutFlushObservers.Contains(shell))
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continue;
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NS_ADDREF(shell);
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mLayoutFlushObservers.RemoveElement(shell);
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shell->mReflowScheduled = false;
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shell->mSuppressInterruptibleReflows = false;
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shell->FlushPendingNotifications(Flush_InterruptibleLayout);
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NS_RELEASE(shell);
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}
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}
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}
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}
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/*
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* Perform notification to imgIRequests subscribed to listen
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* for refresh events.
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*/
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ImageRequestParameters parms = {mMostRecentRefresh};
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if (mRequests.Count()) {
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mRequests.EnumerateEntries(nsRefreshDriver::ImageRequestEnumerator, &parms);
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EnsureTimerStarted(false);
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}
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if (mViewManagerFlushIsPending) {
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mViewManagerFlushIsPending = false;
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mPresContext->GetPresShell()->GetViewManager()->ProcessPendingUpdates();
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}
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if (mThrottled ||
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(mTimerIsPrecise !=
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(GetRefreshTimerType() == nsITimer::TYPE_REPEATING_PRECISE_CAN_SKIP))) {
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// Stop the timer now and restart it here. Stopping is in the mThrottled
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// case ok because either it's already one-shot, and it just fired, and all
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// we need to do is null it out, or it's repeating and we need to reset it
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// to be one-shot. Stopping and restarting in the case when we need to
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// switch from precise to slack timers or vice versa is unfortunately
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// required.
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// Note that the EnsureTimerStarted() call here is ok because
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// EnsureTimerStarted makes sure to not start the timer if it shouldn't be
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// started.
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StopTimer();
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EnsureTimerStarted(true);
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}
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return NS_OK;
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}
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PLDHashOperator
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nsRefreshDriver::ImageRequestEnumerator(nsISupportsHashKey* aEntry,
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void* aUserArg)
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{
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ImageRequestParameters* parms =
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static_cast<ImageRequestParameters*> (aUserArg);
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mozilla::TimeStamp mostRecentRefresh = parms->ts;
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imgIRequest* req = static_cast<imgIRequest*>(aEntry->GetKey());
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NS_ABORT_IF_FALSE(req, "Unable to retrieve the image request");
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nsCOMPtr<imgIContainer> image;
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req->GetImage(getter_AddRefs(image));
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if (image) {
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image->RequestRefresh(mostRecentRefresh);
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}
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return PL_DHASH_NEXT;
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}
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void
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nsRefreshDriver::Freeze()
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{
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NS_ASSERTION(!mFrozen, "Freeze called on already-frozen refresh driver");
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StopTimer();
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mFrozen = true;
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}
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void
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nsRefreshDriver::Thaw()
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{
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NS_ASSERTION(mFrozen, "Thaw called on an unfrozen refresh driver");
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mFrozen = false;
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if (ObserverCount() || ImageRequestCount()) {
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// FIXME: This isn't quite right, since our EnsureTimerStarted call
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// updates our mMostRecentRefresh, but the DoRefresh call won't run
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// and notify our observers until we get back to the event loop.
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// Thus MostRecentRefresh() will lie between now and the DoRefresh.
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NS_DispatchToCurrentThread(NS_NewRunnableMethod(this, &nsRefreshDriver::DoRefresh));
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EnsureTimerStarted(false);
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}
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}
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void
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nsRefreshDriver::SetThrottled(bool aThrottled)
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{
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if (aThrottled != mThrottled) {
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mThrottled = aThrottled;
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if (mTimer) {
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// We want to switch our timer type here, so just stop and
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// restart the timer.
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StopTimer();
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EnsureTimerStarted(true);
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}
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}
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}
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void
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nsRefreshDriver::DoRefresh()
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{
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// Don't do a refresh unless we're in a state where we should be refreshing.
|
|
if (!mFrozen && mPresContext && mTimer) {
|
|
Notify(nsnull);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
bool
|
|
nsRefreshDriver::IsRefreshObserver(nsARefreshObserver *aObserver,
|
|
mozFlushType aFlushType)
|
|
{
|
|
ObserverArray& array = ArrayFor(aFlushType);
|
|
return array.Contains(aObserver);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
nsRefreshDriver::ScheduleFrameRequestCallbacks(nsIDocument* aDocument)
|
|
{
|
|
NS_ASSERTION(mFrameRequestCallbackDocs.IndexOf(aDocument) ==
|
|
mFrameRequestCallbackDocs.NoIndex,
|
|
"Don't schedule the same document multiple times");
|
|
mFrameRequestCallbackDocs.AppendElement(aDocument);
|
|
// No need to worry about restarting our timer in precise mode if it's
|
|
// already running; that will happen automatically when it fires.
|
|
EnsureTimerStarted(false);
|
|
}
|
|
|
|
void
|
|
nsRefreshDriver::RevokeFrameRequestCallbacks(nsIDocument* aDocument)
|
|
{
|
|
mFrameRequestCallbackDocs.RemoveElement(aDocument);
|
|
// No need to worry about restarting our timer in slack mode if it's already
|
|
// running; that will happen automatically when it fires.
|
|
}
|