/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_layout_ScrollAnimationPhysics_h_

#define mozilla_layout_ScrollAnimationPhysics_h_

#include "mozilla/TimeStamp.h"

#include "nsPoint.h"

namespace mozilla {

class ScrollAnimationPhysics

{

public:

  virtual void Update(const TimeStamp& aTime,

                      const nsPoint& aDestination,

                      const nsSize& aCurrentVelocity) = 0;

  // Get the velocity at a point in time in nscoords/sec.

  virtual nsSize VelocityAt(const TimeStamp& aTime) = 0;

  // Returns the expected scroll position at a given point in time, in app

  // units, relative to the scroll frame.

  virtual nsPoint PositionAt(const TimeStamp& aTime) = 0;

  virtual bool IsFinished(const TimeStamp& aTime) = 0;

  virtual ~ScrollAnimationPhysics() {}

};

// Helper for accelerated wheel deltas. This can be called from the main thread

// or the APZ Controller thread.

static inline double

ComputeAcceleratedWheelDelta(double aDelta, int32_t aCounter, int32_t aFactor)

{

  if (!aDelta) {

    return aDelta;

  }

  return (aDelta * aCounter * double(aFactor) / 10);

}

Unexecuted instantiation: Unified_cpp_gfx_layers2.cpp:mozilla::ComputeAcceleratedWheelDelta(double, int, int)

Unexecuted instantiation: Unified_cpp_gfx_layers3.cpp:mozilla::ComputeAcceleratedWheelDelta(double, int, int)

Unexecuted instantiation: Unified_cpp_dom_events2.cpp:mozilla::ComputeAcceleratedWheelDelta(double, int, int)

Unexecuted instantiation: Unified_cpp_layout_generic0.cpp:mozilla::ComputeAcceleratedWheelDelta(double, int, int)

Unexecuted instantiation: Unified_cpp_layout_generic2.cpp:mozilla::ComputeAcceleratedWheelDelta(double, int, int)

static const uint32_t kScrollSeriesTimeoutMs = 80; // in milliseconds

} // namespace mozilla

#endif // mozilla_layout_ScrollAnimationPhysics_h_