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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 "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "cc/output/filter_operations.h"
#include "ui/gfx/transform.h"
namespace gfx {
class BoxF;
}
namespace cc {
class ColorAnimationCurve;
class FilterAnimationCurve;
class FloatAnimationCurve;
class ScrollOffsetAnimationCurve;
class TransformAnimationCurve;
class TransformOperations;
// An animation curve is a function that returns a value given a time.
class CC_EXPORT AnimationCurve {
public:
enum CurveType { Color, Float, Transform, Filter, ScrollOffset };
virtual ~AnimationCurve() {}
virtual double Duration() const = 0;
virtual CurveType Type() const = 0;
virtual scoped_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;
ScrollOffsetAnimationCurve* ToScrollOffsetAnimationCurve();
};
class CC_EXPORT ColorAnimationCurve : public AnimationCurve {
public:
virtual ~ColorAnimationCurve() {}
virtual SkColor GetValue(double t) const = 0;
// Partial Animation implementation.
virtual CurveType Type() const override;
};
class CC_EXPORT FloatAnimationCurve : public AnimationCurve {
public:
virtual ~FloatAnimationCurve() {}
virtual float GetValue(double t) const = 0;
// Partial Animation implementation.
virtual CurveType Type() const override;
};
class CC_EXPORT TransformAnimationCurve : public AnimationCurve {
public:
virtual ~TransformAnimationCurve() {}
virtual gfx::Transform GetValue(double t) const = 0;
// Sets |bounds| to be the bounding box for the region within which |box|
// will move during this animation. If this region cannot be computed,
// returns false.
virtual bool AnimatedBoundsForBox(const gfx::BoxF& box,
gfx::BoxF* bounds) const = 0;
// Returns true if this animation affects scale.
virtual bool AffectsScale() const = 0;
// Returns true if this animation is a translation.
virtual bool IsTranslation() 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;
// Partial Animation implementation.
virtual CurveType Type() const override;
};
class CC_EXPORT FilterAnimationCurve : public AnimationCurve {
public:
virtual ~FilterAnimationCurve() {}
virtual FilterOperations GetValue(double t) const = 0;
virtual bool HasFilterThatMovesPixels() const = 0;
// Partial Animation implementation.
virtual CurveType Type() const override;
};
} // namespace cc
#endif // CC_ANIMATION_ANIMATION_CURVE_H_
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