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      1 /*
      2  * Copyright (C) 2009 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. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 
     28 #if USE(ACCELERATED_COMPOSITING)
     29 
     30 #include "WKCACFContextFlusher.h"
     31 
     32 #include <wtf/StdLibExtras.h>
     33 #include <QuartzCore/CACFContext.h>
     34 
     35 namespace WebCore {
     36 
     37 WKCACFContextFlusher& WKCACFContextFlusher::shared()
     38 {
     39     DEFINE_STATIC_LOCAL(WKCACFContextFlusher, flusher, ());
     40     return flusher;
     41 }
     42 
     43 WKCACFContextFlusher::WKCACFContextFlusher()
     44 {
     45 }
     46 
     47 WKCACFContextFlusher::~WKCACFContextFlusher()
     48 {
     49 }
     50 
     51 void WKCACFContextFlusher::addContext(CACFContextRef context)
     52 {
     53     ASSERT(context);
     54 
     55     m_contexts.add(context);
     56     CFRetain(context);
     57 }
     58 
     59 void WKCACFContextFlusher::removeContext(CACFContextRef context)
     60 {
     61     ASSERT(context);
     62 
     63     ContextSet::iterator found = m_contexts.find(context);
     64     if (found == m_contexts.end())
     65         return;
     66 
     67     CFRelease(*found);
     68     m_contexts.remove(found);
     69 }
     70 
     71 void WKCACFContextFlusher::flushAllContexts()
     72 {
     73     // addContext might get called beneath CACFContextFlush, and we don't want m_contexts to change while
     74     // we're iterating over it, so we move the contexts into a local ContextSet and iterate over that instead.
     75     ContextSet contextsToFlush;
     76     contextsToFlush.swap(m_contexts);
     77 
     78     ContextSet::const_iterator end = contextsToFlush.end();
     79     for (ContextSet::const_iterator it = contextsToFlush.begin(); it != end; ++it) {
     80         CACFContextRef context = *it;
     81         CACFContextFlush(context);
     82         CFRelease(context);
     83     }
     84 }
     85 
     86 }
     87 
     88 #endif // USE(ACCELERATED_COMPOSITING)
     89