Add support for inverse transform animations.

ui/compositor/transform_animation_curve_adapter.h

 // Copyright (c) 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 UI_COMPOSITOR_TRANSFORM_ANIMATION_CURVE_ADAPTER_H_
 #define UI_COMPOSITOR_TRANSFORM_ANIMATION_CURVE_ADAPTER_H_
 
 #include "base/time/time.h"
 #include "cc/animation/animation_curve.h"
 #include "ui/base/animation/tween.h"
+#include "ui/compositor/compositor_export.h"
 #include "ui/gfx/transform.h"
 #include "ui/gfx/transform_util.h"
 
 namespace ui {
 
-class TransformAnimationCurveAdapter :public cc::TransformAnimationCurve {
+class COMPOSITOR_EXPORT TransformAnimationCurveAdapter
+    : public cc::TransformAnimationCurve {
  public:
   TransformAnimationCurveAdapter(Tween::Type tween_type,
                                  gfx::Transform intial_value,
                                  gfx::Transform target_value,
                                  base::TimeDelta duration);
 
   virtual ~TransformAnimationCurveAdapter();
 
   // TransformAnimationCurve implementation.
   virtual double Duration() const OVERRIDE;
   virtual scoped_ptr<AnimationCurve> Clone() const OVERRIDE;
   virtual gfx::Transform GetValue(double t) const OVERRIDE;
   virtual bool AnimatedBoundsForBox(const gfx::BoxF& box,
                                     gfx::BoxF* bounds) const OVERRIDE;
 
  private:
   Tween::Type tween_type_;
   gfx::Transform initial_value_;
   gfx::Transform target_value_;
   gfx::DecomposedTransform decomposed_initial_value_;
   gfx::DecomposedTransform decomposed_target_value_;
   base::TimeDelta duration_;
+
+  DISALLOW_ASSIGN(TransformAnimationCurveAdapter);
+};
+
+class COMPOSITOR_EXPORT InverseTransformCurveAdapter
+    : public cc::TransformAnimationCurve {
+ public:
+  InverseTransformCurveAdapter(TransformAnimationCurveAdapter base_curve,
+                               gfx::Transform initial_value,
+                               base::TimeDelta duration);
+
+  virtual ~InverseTransformCurveAdapter();
+
+  virtual double Duration() const OVERRIDE;
+  virtual scoped_ptr<AnimationCurve> Clone() const OVERRIDE;
+  virtual gfx::Transform GetValue(double t) const OVERRIDE;
+  virtual bool AnimatedBoundsForBox(const gfx::BoxF& box,
+                                    gfx::BoxF* bounds) const OVERRIDE;
+
+ private:
+  TransformAnimationCurveAdapter base_curve_;
+  gfx::Transform initial_value_;
+  gfx::Transform effective_initial_value_;
+  base::TimeDelta duration_;
+
+  DISALLOW_ASSIGN(InverseTransformCurveAdapter);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TRANSFORM_ANIMATION_CURVE_ADAPTER_H_