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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 #ifndef Timing_h
     32 #define Timing_h
     33 
     34 #include "platform/animation/TimingFunction.h"
     35 #include "wtf/MathExtras.h"
     36 #include "wtf/RefPtr.h"
     37 
     38 namespace blink {
     39 
     40 struct Timing {
     41     enum FillMode {
     42         FillModeAuto,
     43         FillModeNone,
     44         FillModeForwards,
     45         FillModeBackwards,
     46         FillModeBoth
     47     };
     48 
     49     enum PlaybackDirection {
     50         PlaybackDirectionNormal,
     51         PlaybackDirectionReverse,
     52         PlaybackDirectionAlternate,
     53         PlaybackDirectionAlternateReverse
     54     };
     55 
     56     static const Timing& defaults()
     57     {
     58         DEFINE_STATIC_LOCAL(Timing, timing, ());
     59         return timing;
     60     }
     61 
     62     Timing()
     63         : startDelay(0)
     64         , endDelay(0)
     65         , fillMode(FillModeAuto)
     66         , iterationStart(0)
     67         , iterationCount(1)
     68         , iterationDuration(std::numeric_limits<double>::quiet_NaN())
     69         , playbackRate(1)
     70         , direction(PlaybackDirectionNormal)
     71         , timingFunction(LinearTimingFunction::shared())
     72     {
     73     }
     74 
     75     void assertValid() const
     76     {
     77         ASSERT(std::isfinite(startDelay));
     78         ASSERT(std::isfinite(endDelay));
     79         ASSERT(std::isfinite(iterationStart));
     80         ASSERT(iterationStart >= 0);
     81         ASSERT(iterationCount >= 0);
     82         ASSERT(std::isnan(iterationDuration) || iterationDuration >= 0);
     83         ASSERT(std::isfinite(playbackRate));
     84         ASSERT(timingFunction);
     85     }
     86 
     87     double startDelay;
     88     double endDelay;
     89     FillMode fillMode;
     90     double iterationStart;
     91     double iterationCount;
     92     double iterationDuration;
     93     double playbackRate;
     94     PlaybackDirection direction;
     95     RefPtr<TimingFunction> timingFunction;
     96 };
     97 
     98 } // namespace blink
     99 
    100 #endif
    101