| /* |
| * Copyright (C) 2010, 2014 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. ``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 |
| * 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. |
| */ |
| |
| #import "config.h" |
| #import "DisplayRefreshMonitorIOS.h" |
| |
| #if PLATFORM(IOS_FAMILY) |
| |
| #import "DisplayUpdate.h" |
| #import "Logging.h" |
| #import "WebCoreThread.h" |
| #import <QuartzCore/CADisplayLink.h> |
| #import <wtf/MainThread.h> |
| #import <wtf/text/TextStream.h> |
| |
| using WebCore::DisplayRefreshMonitorIOS; |
| |
| constexpr WebCore::FramesPerSecond DisplayLinkFramesPerSecond = 60; |
| |
| @interface WebDisplayLinkHandler : NSObject |
| { |
| DisplayRefreshMonitorIOS* m_monitor; |
| CADisplayLink *m_displayLink; |
| } |
| |
| - (id)initWithMonitor:(DisplayRefreshMonitorIOS*)monitor; |
| - (void)handleDisplayLink:(CADisplayLink *)sender; |
| - (void)setPaused:(BOOL)paused; |
| - (void)invalidate; |
| |
| @end |
| |
| @implementation WebDisplayLinkHandler |
| |
| - (id)initWithMonitor:(DisplayRefreshMonitorIOS*)monitor |
| { |
| if (self = [super init]) { |
| m_monitor = monitor; |
| // Note that CADisplayLink retains its target (self), so a call to -invalidate is needed on teardown. |
| m_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(handleDisplayLink:)]; |
| [m_displayLink addToRunLoop:WebThreadNSRunLoop() forMode:NSDefaultRunLoopMode]; |
| m_displayLink.preferredFramesPerSecond = DisplayLinkFramesPerSecond; |
| } |
| return self; |
| } |
| |
| - (void)dealloc |
| { |
| ASSERT(!m_displayLink); // -invalidate should have been called already. |
| [super dealloc]; |
| } |
| |
| - (void)handleDisplayLink:(CADisplayLink *)sender |
| { |
| UNUSED_PARAM(sender); |
| ASSERT(isMainThread()); |
| |
| m_monitor->displayLinkCallbackFired(); |
| } |
| |
| - (void)setPaused:(BOOL)paused |
| { |
| [m_displayLink setPaused:paused]; |
| } |
| |
| - (void)invalidate |
| { |
| [m_displayLink invalidate]; |
| m_displayLink = nullptr; |
| } |
| |
| @end |
| |
| namespace WebCore { |
| |
| constexpr unsigned maxUnscheduledFireCount { 1 }; |
| |
| DisplayRefreshMonitorIOS::DisplayRefreshMonitorIOS(PlatformDisplayID displayID) |
| : DisplayRefreshMonitor(displayID) |
| { |
| setMaxUnscheduledFireCount(maxUnscheduledFireCount); |
| } |
| |
| DisplayRefreshMonitorIOS::~DisplayRefreshMonitorIOS() |
| { |
| ASSERT(!m_handler); |
| } |
| |
| void DisplayRefreshMonitorIOS::stop() |
| { |
| [m_handler invalidate]; |
| m_handler = nil; |
| } |
| |
| void DisplayRefreshMonitorIOS::displayLinkCallbackFired() |
| { |
| displayLinkFired(m_currentUpdate); |
| m_currentUpdate = m_currentUpdate.nextUpdate(); |
| } |
| |
| bool DisplayRefreshMonitorIOS::startNotificationMechanism() |
| { |
| if (m_displayLinkIsActive) |
| return true; |
| |
| if (!m_handler) { |
| LOG_WITH_STREAM(DisplayLink, stream << "DisplayRefreshMonitorIOS::startNotificationMechanism - creating WebDisplayLinkHandler"); |
| m_handler = adoptNS([[WebDisplayLinkHandler alloc] initWithMonitor:this]); |
| } |
| |
| LOG_WITH_STREAM(DisplayLink, stream << "DisplayRefreshMonitorIOS::startNotificationMechanism - starting WebDisplayLinkHandler"); |
| [m_handler setPaused:NO]; |
| |
| m_currentUpdate = { 0, DisplayLinkFramesPerSecond }; |
| m_displayLinkIsActive = true; |
| |
| return true; |
| } |
| |
| void DisplayRefreshMonitorIOS::stopNotificationMechanism() |
| { |
| if (!m_displayLinkIsActive) |
| return; |
| |
| LOG_WITH_STREAM(DisplayLink, stream << "DisplayRefreshMonitorIOS::stopNotificationMechanism - pausing WebDisplayLinkHandler"); |
| [m_handler setPaused:YES]; |
| m_displayLinkIsActive = false; |
| } |
| |
| std::optional<FramesPerSecond> DisplayRefreshMonitorIOS::displayNominalFramesPerSecond() |
| { |
| return DisplayLinkFramesPerSecond; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // PLATFORM(IOS_FAMILY) |