Home | History | Annotate | Download | only in animation 
      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/AnimatableValue.h"
     33 #include "core/animation/AnimatableNeutral.h"
     34 #include "wtf/StdLibExtras.h"
     35 #include <algorithm>
     36 
     37 namespace WebCore {
     38 
     39 const AnimatableValue* AnimatableValue::neutralValue()
     40 {
     41     DEFINE_STATIC_REF(AnimatableNeutral, neutralSentinelValue, (AnimatableNeutral::create()));
     42     return neutralSentinelValue;
     43 }
     44 
     45 PassRefPtr<AnimatableValue> AnimatableValue::interpolate(const AnimatableValue* left, const AnimatableValue* right, double fraction)
     46 {
     47     ASSERT(left);
     48     ASSERT(right);
     49     ASSERT(!left->isNeutral());
     50     ASSERT(!right->isNeutral());
     51 
     52     if (fraction && fraction != 1 && left->isSameType(right))
     53         return left->interpolateTo(right, fraction);
     54 
     55     return defaultInterpolateTo(left, right, fraction);
     56 }
     57 
     58 PassRefPtr<AnimatableValue> AnimatableValue::add(const AnimatableValue* left, const AnimatableValue* right)
     59 {
     60     ASSERT(left);
     61     ASSERT(right);
     62 
     63     if (left->isNeutral())
     64         return takeConstRef(right);
     65     if (right->isNeutral())
     66         return takeConstRef(left);
     67 
     68     if (left->isSameType(right))
     69         return left->addWith(right);
     70 
     71     return defaultAddWith(left, right);
     72 }
     73 
     74 PassRefPtr<AnimatableValue> AnimatableValue::addWith(const AnimatableValue* value) const
     75 {
     76     return defaultAddWith(this, value);
     77 }
     78 
     79 } // namespace WebCore
     80