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/*
* Copyright (C) 2011 Google Inc. All Rights Reserved.
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "config.h"
#include "ScriptedAnimationController.h"
#include "InspectorInstrumentation.h"
#include "Page.h"
#include "Quirks.h"
#include "RequestAnimationFrameCallback.h"
#include "Settings.h"
#include <wtf/Ref.h>
#include <wtf/SystemTracing.h>
namespace WebCore {
ScriptedAnimationController::ScriptedAnimationController(Document& document)
: m_document(makeWeakPtr(document))
{
}
ScriptedAnimationController::~ScriptedAnimationController() = default;
bool ScriptedAnimationController::requestAnimationFrameEnabled() const
{
return m_document && m_document->settings().requestAnimationFrameEnabled();
}
void ScriptedAnimationController::suspend()
{
++m_suspendCount;
}
void ScriptedAnimationController::resume()
{
// It would be nice to put an ASSERT(m_suspendCount > 0) here, but in WK1 resume() can be called
// even when suspend hasn't (if a tab was created in the background).
if (m_suspendCount > 0)
--m_suspendCount;
if (!m_suspendCount && m_callbacks.size())
scheduleAnimation();
}
Page* ScriptedAnimationController::page() const
{
return m_document ? m_document->page() : nullptr;
}
Seconds ScriptedAnimationController::interval() const
{
if (auto* page = this->page())
return std::max(preferredScriptedAnimationInterval(), page->preferredRenderingUpdateInterval());
return FullSpeedAnimationInterval;
}
Seconds ScriptedAnimationController::preferredScriptedAnimationInterval() const
{
return preferredFrameInterval(m_throttlingReasons);
}
OptionSet<ThrottlingReason> ScriptedAnimationController::throttlingReasons() const
{
if (auto* page = this->page())
return page->throttlingReasons() | m_throttlingReasons;
return { };
}
bool ScriptedAnimationController::isThrottledRelativeToPage() const
{
if (auto* page = this->page())
return preferredScriptedAnimationInterval() > page->preferredRenderingUpdateInterval();
return false;
}
bool ScriptedAnimationController::shouldRescheduleRequestAnimationFrame(ReducedResolutionSeconds timestamp) const
{
return isThrottledRelativeToPage() && (timestamp - m_lastAnimationFrameTimestamp < preferredScriptedAnimationInterval());
}
ScriptedAnimationController::CallbackId ScriptedAnimationController::registerCallback(Ref<RequestAnimationFrameCallback>&& callback)
{
CallbackId callbackId = ++m_nextCallbackId;
callback->m_firedOrCancelled = false;
callback->m_id = callbackId;
m_callbacks.append(WTFMove(callback));
if (m_document)
InspectorInstrumentation::didRequestAnimationFrame(*m_document, callbackId);
if (!m_suspendCount)
scheduleAnimation();
return callbackId;
}
void ScriptedAnimationController::cancelCallback(CallbackId callbackId)
{
bool cancelled = m_callbacks.removeFirstMatching([callbackId](auto& callback) {
if (callback->m_id != callbackId)
return false;
callback->m_firedOrCancelled = true;
return true;
});
if (cancelled && m_document)
InspectorInstrumentation::didCancelAnimationFrame(*m_document, callbackId);
}
void ScriptedAnimationController::serviceRequestAnimationFrameCallbacks(ReducedResolutionSeconds timestamp)
{
if (!m_callbacks.size() || m_suspendCount || !requestAnimationFrameEnabled())
return;
if (shouldRescheduleRequestAnimationFrame(timestamp)) {
scheduleAnimation();
return;
}
TraceScope tracingScope(RAFCallbackStart, RAFCallbackEnd);
auto highResNowMs = std::round(1000 * timestamp.seconds());
if (m_document && m_document->quirks().needsMillisecondResolutionForHighResTimeStamp())
highResNowMs += 0.1;
// First, generate a list of callbacks to consider. Callbacks registered from this point
// on are considered only for the "next" frame, not this one.
CallbackList callbacks(m_callbacks);
// Invoking callbacks may detach elements from our document, which clears the document's
// reference to us, so take a defensive reference.
Ref<ScriptedAnimationController> protectedThis(*this);
Ref<Document> protectedDocument(*m_document);
for (auto& callback : callbacks) {
if (callback->m_firedOrCancelled)
continue;
callback->m_firedOrCancelled = true;
InspectorInstrumentation::willFireAnimationFrame(protectedDocument, callback->m_id);
callback->handleEvent(highResNowMs);
InspectorInstrumentation::didFireAnimationFrame(protectedDocument);
}
// Remove any callbacks we fired from the list of pending callbacks.
m_callbacks.removeAllMatching([](auto& callback) {
return callback->m_firedOrCancelled;
});
m_lastAnimationFrameTimestamp = timestamp;
if (m_callbacks.size())
scheduleAnimation();
}
void ScriptedAnimationController::scheduleAnimation()
{
if (!requestAnimationFrameEnabled())
return;
if (auto* page = this->page())
page->renderingUpdateScheduler().scheduleTimedRenderingUpdate();
}
}