Web Animations: Introduce ActiveAnimations and AnimationStack

Source/core/animation/AnimationStack.cpp

Index: Source/core/animation/AnimationStack.cpp
diff --git a/Source/core/animation/AnimationStack.cpp b/Source/core/animation/AnimationStack.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d04b81b41652bb168f9b354eeee1916fe5fd1131
--- /dev/null
+++ b/Source/core/animation/AnimationStack.cpp
@@ -0,0 +1,56 @@
+/*
+ * 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/AnimationStack.h"
+
+namespace WebCore {
+
+void AnimationStack::add(const Element* element, Animation* animation)
+{
+    Vector<Animation*>& animations = m_elementAnimations.add(element, Vector<Animation*>()).iterator->value;
+    animations.append(animation);
+}
+
+void AnimationStack::remove(const Element* element, Animation* animation)
+{
+    ElementAnimationMap::iterator result = m_elementAnimations.find(element);
+    if (result != m_elementAnimations.end()) {
+        size_t position = result->value.find(animation);
+        ASSERT(position != notFound);
+        result->value.remove(position);
+        if (result->value.isEmpty())
+            remove(element);
+    } else {
+        ASSERT_NOT_REACHED();

[esprehn, 2013/07/17 06:48:01]

This should be a release assert then.

RELEASE_ASSERT(result != m_elementAnimations.end());

and get rid of this if/else

[dstockwell, 2013/07/17 13:10:19]

Done.

+    }
+}
+
+} // namespace WebCore