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#include "base/logging.h"
6#include "base/memory/scoped_ptr.h"
7#include "cc/animation/timing_function.h"
8
9namespace cc {
10
11TimingFunction::TimingFunction() {}
12
13TimingFunction::~TimingFunction() {}
14
15scoped_ptr<CubicBezierTimingFunction> CubicBezierTimingFunction::Create(
16    double x1, double y1, double x2, double y2) {
17  return make_scoped_ptr(new CubicBezierTimingFunction(x1, y1, x2, y2));
18}
19
20CubicBezierTimingFunction::CubicBezierTimingFunction(double x1,
21                                                     double y1,
22                                                     double x2,
23                                                     double y2)
24    : bezier_(x1, y1, x2, y2) {}
25
26CubicBezierTimingFunction::~CubicBezierTimingFunction() {}
27
28float CubicBezierTimingFunction::GetValue(double x) const {
29  return static_cast<float>(bezier_.Solve(x));
30}
31
32float CubicBezierTimingFunction::Velocity(double x) const {
33  return static_cast<float>(bezier_.Slope(x));
34}
35
36void CubicBezierTimingFunction::Range(float* min, float* max) const {
37  double min_d = 0;
38  double max_d = 1;
39  bezier_.Range(&min_d, &max_d);
40  *min = static_cast<float>(min_d);
41  *max = static_cast<float>(max_d);
42}
43
44scoped_ptr<TimingFunction> CubicBezierTimingFunction::Clone() const {
45  return make_scoped_ptr(new CubicBezierTimingFunction(*this))
46      .PassAs<TimingFunction>();
47}
48
49// These numbers come from
50// http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag.
51scoped_ptr<TimingFunction> EaseTimingFunction::Create() {
52  return CubicBezierTimingFunction::Create(
53      0.25, 0.1, 0.25, 1.0).PassAs<TimingFunction>();
54}
55
56scoped_ptr<TimingFunction> EaseInTimingFunction::Create() {
57  return CubicBezierTimingFunction::Create(
58      0.42, 0.0, 1.0, 1.0).PassAs<TimingFunction>();
59}
60
61scoped_ptr<TimingFunction> EaseOutTimingFunction::Create() {
62  return CubicBezierTimingFunction::Create(
63      0.0, 0.0, 0.58, 1.0).PassAs<TimingFunction>();
64}
65
66scoped_ptr<TimingFunction> EaseInOutTimingFunction::Create() {
67  return CubicBezierTimingFunction::Create(
68      0.42, 0.0, 0.58, 1).PassAs<TimingFunction>();
69}
70
71}  // namespace cc
72