text: /*
   * 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.
   */
  
  #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_TIMING_H_
  #define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_TIMING_H_
  
  #include "base/memory/scoped_refptr.h"
  #include "third_party/blink/renderer/core/style/data_equivalency.h"
  #include "third_party/blink/renderer/platform/animation/compositor_keyframe_model.h"
  #include "third_party/blink/renderer/platform/animation/timing_function.h"
  #include "third_party/blink/renderer/platform/wtf/allocator.h"
  #include "third_party/blink/renderer/platform/wtf/math_extras.h"
  
  namespace blink {
  
  struct Timing {
    USING_FAST_MALLOC(Timing);
  
   public:
    using FillMode = CompositorKeyframeModel::FillMode;
    using PlaybackDirection = CompositorKeyframeModel::Direction;
  
    static String FillModeString(FillMode);
    static String PlaybackDirectionString(PlaybackDirection);
  
    static const Timing& Defaults() {
      DEFINE_STATIC_LOCAL(Timing, timing, ());
      return timing;
    }
  
    Timing()
        : start_delay(0),
          end_delay(0),
          fill_mode(FillMode::AUTO),
          iteration_start(0),
          iteration_count(1),
          iteration_duration(std::numeric_limits<double>::quiet_NaN()),
          playback_rate(1),
          direction(PlaybackDirection::NORMAL),
          timing_function(LinearTimingFunction::Shared()) {}
  
    void AssertValid() const {
      DCHECK(std::isfinite(start_delay));
      DCHECK(std::isfinite(end_delay));
      DCHECK(std::isfinite(iteration_start));
      DCHECK_GE(iteration_start, 0);
      DCHECK_GE(iteration_count, 0);
      DCHECK(std::isnan(iteration_duration) || iteration_duration >= 0);
      DCHECK(std::isfinite(playback_rate));
      DCHECK(timing_function);
    }
  
    bool operator==(const Timing& other) const {
      return start_delay == other.start_delay && end_delay == other.end_delay &&
             fill_mode == other.fill_mode &&
             iteration_start == other.iteration_start &&
             iteration_count == other.iteration_count &&
             ((std::isnan(iteration_duration) &&
               std::isnan(other.iteration_duration)) ||
              iteration_duration == other.iteration_duration) &&
             playback_rate == other.playback_rate &&
             direction == other.direction &&
             DataEquivalent(timing_function.get(), other.timing_function.get());
    }
  
    bool operator!=(const Timing& other) const { return !(*this == other); }
  
    double start_delay;
    double end_delay;
    FillMode fill_mode;
    double iteration_start;
    double iteration_count;
    double iteration_duration;
  
    // TODO(crbug.com/630915) Remove playbackRate
    double playback_rate;
    PlaybackDirection direction;
    scoped_refptr<TimingFunction> timing_function;
  };
  
  }  // namespace blink
  
  #endif
  