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      1 /*
      2  * Copyright (C) 2013 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/animation/css/CSSPendingAnimations.h"
     33 
     34 #include "core/animation/Animation.h"
     35 #include "core/animation/DocumentTimeline.h"
     36 #include "core/frame/FrameView.h"
     37 
     38 namespace WebCore {
     39 
     40 void CSSPendingAnimations::add(Player* player)
     41 {
     42     ASSERT(player->source()->isAnimation());
     43     // The actual start time is either this value, or the time that
     44     // this animation, or an animation that it is synchronized with
     45     // is started on the compositor.
     46     const double defaultStartTime = player->timeline().currentTime();
     47     m_pending.append(std::make_pair(player, defaultStartTime));
     48 }
     49 
     50 bool CSSPendingAnimations::startPendingAnimations()
     51 {
     52     bool startedOnCompositor = false;
     53     for (size_t i = 0; i < m_pending.size(); ++i) {
     54         if (m_pending[i].first->maybeStartAnimationOnCompositor())
     55             startedOnCompositor = true;
     56     }
     57 
     58     // If any animations were started on the compositor, all remaining
     59     // need to wait for a synchronized start time. Otherwise they may
     60     // start immediately.
     61     if (startedOnCompositor) {
     62         for (size_t i = 0; i < m_pending.size(); ++i)
     63             m_waitingForCompositorAnimationStart.append(m_pending[i].first);
     64     } else {
     65         for (size_t i = 0; i < m_pending.size(); ++i)
     66             m_pending[i].first->setStartTime(m_pending[i].second);
     67     }
     68     m_pending.clear();
     69 
     70     if (startedOnCompositor || m_waitingForCompositorAnimationStart.isEmpty())
     71         return !m_waitingForCompositorAnimationStart.isEmpty();
     72 
     73     // Check if we're still waiting for any compositor animations to start.
     74     for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
     75         if (m_waitingForCompositorAnimationStart[i].get()->hasActiveAnimationsOnCompositor())
     76             return true;
     77     }
     78 
     79     // If not, go ahead and start any animations that were waiting.
     80     notifyCompositorAnimationStarted(monotonicallyIncreasingTime());
     81     return false;
     82 }
     83 
     84 void CSSPendingAnimations::notifyCompositorAnimationStarted(double monotonicAnimationStartTime)
     85 {
     86     for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
     87         Player* player = m_waitingForCompositorAnimationStart[i].get();
     88         player->setStartTime(monotonicAnimationStartTime - player->timeline().zeroTime());
     89     }
     90 
     91     m_waitingForCompositorAnimationStart.clear();
     92 }
     93 
     94 } // namespace
     95