cc/animation_curve.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_ANIMATION_CURVE_H_
   6 #define CC_ANIMATION_CURVE_H_
   7
   8 #include <public/WebTransformationMatrix.h>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "cc/cc_export.h"
  12
  13 namespace cc {
  14
  15 class FloatAnimationCurve;
  16 class TransformAnimationCurve;
  17 class TransformOperations;
  18
  19 // An animation curve is a function that returns a value given a time.
  20 // There are currently only two types of curve, float and transform.
  21 class CC_EXPORT AnimationCurve {
  22 public:
  23     enum Type { Float, Transform };
  24
  25     virtual ~AnimationCurve() { }
  26
  27     virtual double duration() const = 0;
  28     virtual Type type() const = 0;
  29     virtual scoped_ptr<AnimationCurve> clone() const = 0;
  30
  31     const FloatAnimationCurve* toFloatAnimationCurve() const;
  32     const TransformAnimationCurve* toTransformAnimationCurve() const;
  33 };
  34
  35 class CC_EXPORT FloatAnimationCurve : public AnimationCurve {
  36 public:
  37     virtual ~FloatAnimationCurve() { }
  38
  39     virtual float getValue(double t) const = 0;
  40
  41     // Partial Animation implementation.
  42     virtual Type type() const OVERRIDE;
  43 };
  44
  45 class CC_EXPORT TransformAnimationCurve : public AnimationCurve {
  46 public:
  47     virtual ~TransformAnimationCurve() { }
  48
  49     virtual WebKit::WebTransformationMatrix getValue(double t) const = 0;
  50
  51     // Partial Animation implementation.
  52     virtual Type type() const OVERRIDE;
  53 };
  54
  55 } // namespace cc
  56
  57 #endif  // CC_ANIMATION_CURVE_H_