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      1 /*
      2  * Copyright (C) 2011 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #import "config.h"
     27 #import "LayerTreeHostCAMac.h"
     28 
     29 #import "WebProcess.h"
     30 #import <QuartzCore/CATransaction.h>
     31 #import <WebCore/GraphicsLayer.h>
     32 #import <WebKitSystemInterface.h>
     33 
     34 using namespace WebCore;
     35 
     36 @interface CATransaction (Details)
     37 + (void)synchronize;
     38 @end
     39 
     40 namespace WebKit {
     41 
     42 PassRefPtr<LayerTreeHostCAMac> LayerTreeHostCAMac::create(WebPage* webPage)
     43 {
     44     RefPtr<LayerTreeHostCAMac> host = adoptRef(new LayerTreeHostCAMac(webPage));
     45     host->initialize();
     46     return host.release();
     47 }
     48 
     49 LayerTreeHostCAMac::LayerTreeHostCAMac(WebPage* webPage)
     50     : LayerTreeHostCA(webPage)
     51 {
     52 }
     53 
     54 LayerTreeHostCAMac::~LayerTreeHostCAMac()
     55 {
     56     ASSERT(!m_flushPendingLayerChangesRunLoopObserver);
     57     ASSERT(!m_remoteLayerClient);
     58 }
     59 
     60 void LayerTreeHostCAMac::platformInitialize(LayerTreeContext& layerTreeContext)
     61 {
     62     mach_port_t serverPort = WebProcess::shared().compositingRenderServerPort();
     63     m_remoteLayerClient = WKCARemoteLayerClientMakeWithServerPort(serverPort);
     64 
     65     WKCARemoteLayerClientSetLayer(m_remoteLayerClient.get(), rootLayer()->platformLayer());
     66 
     67     layerTreeContext.contextID = WKCARemoteLayerClientGetClientId(m_remoteLayerClient.get());
     68 }
     69 
     70 void LayerTreeHostCAMac::scheduleLayerFlush()
     71 {
     72     CFRunLoopRef currentRunLoop = CFRunLoopGetCurrent();
     73 
     74     // Make sure we wake up the loop or the observer could be delayed until some other source fires.
     75     CFRunLoopWakeUp(currentRunLoop);
     76 
     77     if (m_flushPendingLayerChangesRunLoopObserver)
     78         return;
     79 
     80     // Run before the Core Animation commit observer, which has order 2000000.
     81     const CFIndex runLoopOrder = 2000000 - 1;
     82     CFRunLoopObserverContext context = { 0, this, 0, 0, 0 };
     83     m_flushPendingLayerChangesRunLoopObserver.adoptCF(CFRunLoopObserverCreate(0, kCFRunLoopBeforeWaiting | kCFRunLoopExit, true, runLoopOrder, flushPendingLayerChangesRunLoopObserverCallback, &context));
     84 
     85     CFRunLoopAddObserver(currentRunLoop, m_flushPendingLayerChangesRunLoopObserver.get(), kCFRunLoopCommonModes);
     86 }
     87 
     88 void LayerTreeHostCAMac::invalidate()
     89 {
     90     if (m_flushPendingLayerChangesRunLoopObserver) {
     91         CFRunLoopObserverInvalidate(m_flushPendingLayerChangesRunLoopObserver.get());
     92         m_flushPendingLayerChangesRunLoopObserver = nullptr;
     93     }
     94 
     95     WKCARemoteLayerClientInvalidate(m_remoteLayerClient.get());
     96     m_remoteLayerClient = nullptr;
     97 
     98     LayerTreeHostCA::invalidate();
     99 }
    100 
    101 void LayerTreeHostCAMac::sizeDidChange(const IntSize& newSize)
    102 {
    103     LayerTreeHostCA::sizeDidChange(newSize);
    104     [CATransaction flush];
    105     [CATransaction synchronize];
    106 }
    107 
    108 void LayerTreeHostCAMac::forceRepaint()
    109 {
    110     LayerTreeHostCA::forceRepaint();
    111     [CATransaction flush];
    112     [CATransaction synchronize];
    113 }
    114 
    115 void LayerTreeHostCAMac::pauseRendering()
    116 {
    117     CALayer* root = rootLayer()->platformLayer();
    118     [root setValue:(id)kCFBooleanTrue forKey:@"NSCAViewRenderPaused"];
    119     [[NSNotificationCenter defaultCenter] postNotificationName:@"NSCAViewRenderDidPauseNotification" object:nil userInfo:[NSDictionary dictionaryWithObject:root forKey:@"layer"]];
    120 }
    121 
    122 void LayerTreeHostCAMac::resumeRendering()
    123 {
    124     CALayer* root = rootLayer()->platformLayer();
    125     [root setValue:(id)kCFBooleanFalse forKey:@"NSCAViewRenderPaused"];
    126     [[NSNotificationCenter defaultCenter] postNotificationName:@"NSCAViewRenderDidResumeNotification" object:nil userInfo:[NSDictionary dictionaryWithObject:root forKey:@"layer"]];
    127 }
    128 
    129 void LayerTreeHostCAMac::flushPendingLayerChangesRunLoopObserverCallback(CFRunLoopObserverRef, CFRunLoopActivity, void* context)
    130 {
    131     // This gets called outside of the normal event loop so wrap in an autorelease pool
    132     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    133     static_cast<LayerTreeHostCAMac*>(context)->performScheduledLayerFlush();
    134     [pool drain];
    135 }
    136 
    137 void LayerTreeHostCAMac::didPerformScheduledLayerFlush()
    138 {
    139     // We successfully flushed the pending layer changes, remove the run loop observer.
    140     ASSERT(m_flushPendingLayerChangesRunLoopObserver);
    141     CFRunLoopObserverInvalidate(m_flushPendingLayerChangesRunLoopObserver.get());
    142     m_flushPendingLayerChangesRunLoopObserver = 0;
    143 
    144     LayerTreeHostCA::didPerformScheduledLayerFlush();
    145 }
    146 
    147 } // namespace WebKit
    148