Source/core/animation/css/CSSPendingAnimations.cpp

/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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.
 */

#include "config.h"
#include "core/animation/css/CSSPendingAnimations.h"

#include "core/animation/Animation.h"
#include "core/animation/DocumentTimeline.h"
#include "core/frame/FrameView.h"

namespace WebCore {

void CSSPendingAnimations::add(Player* player)
{
    ASSERT(player->source()->isAnimation());
    // The actual start time is either this value, or the time that
    // this animation, or an animation that it is synchronized with
    // is started on the compositor.
    const double defaultStartTime = player->timeline().currentTime();
    m_pending.append(std::make_pair(player, defaultStartTime));
}

bool CSSPendingAnimations::startPendingAnimations()
{
    bool startedOnCompositor = false;
    for (size_t i = 0; i < m_pending.size(); ++i) {
        if (m_pending[i].first->maybeStartAnimationOnCompositor())
            startedOnCompositor = true;
    }

    // If any animations were started on the compositor, all remaining
    // need to wait for a synchronized start time. Otherwise they may
    // start immediately.
    if (startedOnCompositor) {
        for (size_t i = 0; i < m_pending.size(); ++i)
            m_waitingForCompositorAnimationStart.append(m_pending[i].first);
    } else {
        for (size_t i = 0; i < m_pending.size(); ++i)
            m_pending[i].first->setStartTime(m_pending[i].second);
    }
    m_pending.clear();

    if (startedOnCompositor || m_waitingForCompositorAnimationStart.isEmpty())
        return !m_waitingForCompositorAnimationStart.isEmpty();

    // Check if we're still waiting for any compositor animations to start.
    for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
        if (m_waitingForCompositorAnimationStart[i].get()->hasActiveAnimationsOnCompositor())
            return true;
    }

    // If not, go ahead and start any animations that were waiting.
    notifyCompositorAnimationStarted(monotonicallyIncreasingTime());
    return false;
}

void CSSPendingAnimations::notifyCompositorAnimationStarted(double monotonicAnimationStartTime)
{
    for (size_t i = 0; i < m_waitingForCompositorAnimationStart.size(); ++i) {
        Player* player = m_waitingForCompositorAnimationStart[i].get();
        player->setStartTime(monotonicAnimationStartTime - player->timeline().zeroTime());
    }

    m_waitingForCompositorAnimationStart.clear();
}

} // namespace