Web Animations CSS: Start running animations on the compositor

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/DocumentTimeline.h"
+
+namespace WebCore {
+
+void CSSPendingAnimations::startPendingAnimations()
+{
+    Vector<RefPtr<Player> > unstarted;
+    for (size_t i = 0; i < m_pending.size(); i++) {
+        if (m_pending[i]->startCompositorAnimations())
+            m_waitingForCompositorAnimationStart.append(m_pending[i]);
+        else
+            unstarted.append(m_pending[i]);
+    }
+
+    // If any animations were started on the compositor, all remaining
+    // need to wait for a start time.
+    if (unstarted.size() < m_pending.size()) {
+        // FIXME: handle case where timeline has not yet started
+        m_waitingForCompositorAnimationStart.append(unstarted);
+    } else {
+        // Otherwise, all players can start immediately.
+        for (size_t i = 0; i < unstarted.size(); i++) {
+            Player* player = unstarted[i].get();
+            player->setStartTime(player->timeline().currentTime());

[Steve Block, 2013/11/18 05:03:03]

Time is frozen here, so all players get exactly the same time, right? Can we
assert or comment this?

[dstockwell, 2013/11/18 06:11:20]

Hmm, non trivial to assert this (as there are multiple timelines involved). We
could expose the clock from timeline and add isFrozen. Added a FIXME for now.

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