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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_ANIMATION_ANIMATION_CURVE_H_
#define CC_ANIMATION_ANIMATION_CURVE_H_
#include <memory>
#include "base/time/time.h"
#include "cc/animation/animation_export.h"
#include "cc/paint/filter_operations.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/transform.h"
namespace cc {
class ColorAnimationCurve;
class FilterAnimationCurve;
class FloatAnimationCurve;
class ScrollOffsetAnimationCurve;
class SizeAnimationCurve;
class TransformAnimationCurve;
class TransformOperations;
// An animation curve is a function that returns a value given a time.
class CC_ANIMATION_EXPORT AnimationCurve {
public:
enum CurveType {
COLOR = 0,
FLOAT,
TRANSFORM,
FILTER,
SCROLL_OFFSET,
SIZE,
// This must be last
LAST_CURVE_TYPE = SIZE,
};
virtual ~AnimationCurve() {}
virtual base::TimeDelta Duration() const = 0;
virtual CurveType Type() const = 0;
virtual std::unique_ptr<AnimationCurve> Clone() const = 0;
const ColorAnimationCurve* ToColorAnimationCurve() const;
const FloatAnimationCurve* ToFloatAnimationCurve() const;
const TransformAnimationCurve* ToTransformAnimationCurve() const;
const FilterAnimationCurve* ToFilterAnimationCurve() const;
const ScrollOffsetAnimationCurve* ToScrollOffsetAnimationCurve() const;
const SizeAnimationCurve* ToSizeAnimationCurve() const;
ScrollOffsetAnimationCurve* ToScrollOffsetAnimationCurve();
};
class CC_ANIMATION_EXPORT ColorAnimationCurve : public AnimationCurve {
public:
~ColorAnimationCurve() override {}
virtual SkColor GetValue(base::TimeDelta t) const = 0;
CurveType Type() const override;
};
class CC_ANIMATION_EXPORT FloatAnimationCurve : public AnimationCurve {
public:
~FloatAnimationCurve() override {}
virtual float GetValue(base::TimeDelta t) const = 0;
CurveType Type() const override;
};
class CC_ANIMATION_EXPORT TransformAnimationCurve : public AnimationCurve {
public:
~TransformAnimationCurve() override {}
virtual TransformOperations GetValue(base::TimeDelta t) const = 0;
// Returns true if this animation is a translation.
virtual bool IsTranslation() const = 0;
// Returns true if this animation preserves axis alignment.
virtual bool PreservesAxisAlignment() const = 0;
// Animation start scale
virtual bool AnimationStartScale(bool forward_direction,
float* start_scale) const = 0;
// Set |max_scale| to the maximum scale along any dimension at the end of
// intermediate animation target points (eg keyframe end points). When
// |forward_direction| is true, the animation curve assumes it plays from
// the first keyframe to the last, otherwise it assumes the opposite. Returns
// false if the maximum scale cannot be computed.
virtual bool MaximumTargetScale(bool forward_direction,
float* max_scale) const = 0;
CurveType Type() const override;
};
class CC_ANIMATION_EXPORT FilterAnimationCurve : public AnimationCurve {
public:
~FilterAnimationCurve() override {}
virtual FilterOperations GetValue(base::TimeDelta t) const = 0;
virtual bool HasFilterThatMovesPixels() const = 0;
CurveType Type() const override;
};
class CC_ANIMATION_EXPORT SizeAnimationCurve : public AnimationCurve {
public:
~SizeAnimationCurve() override {}
virtual gfx::SizeF GetValue(base::TimeDelta t) const = 0;
CurveType Type() const override;
};
} // namespace cc
#endif // CC_ANIMATION_ANIMATION_CURVE_H_
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