cc/CCTimingFunction.cpp

   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 "config.h"
   6
   7 #include "CCTimingFunction.h"
   8
   9 #include <wtf/OwnPtr.h>
  10
  11 namespace {
  12 const double epsilon = 1e-6;
  13 } // namespace
  14
  15 namespace cc {
  16
  17 CCTimingFunction::CCTimingFunction()
  18 {
  19 }
  20
  21 CCTimingFunction::~CCTimingFunction()
  22 {
  23 }
  24
  25 double CCTimingFunction::duration() const
  26 {
  27     return 1.0;
  28 }
  29
  30 PassOwnPtr<CCCubicBezierTimingFunction> CCCubicBezierTimingFunction::create(double x1, double y1, double x2, double y2)
  31 {
  32     return adoptPtr(new CCCubicBezierTimingFunction(x1, y1, x2, y2));
  33 }
  34
  35 CCCubicBezierTimingFunction::CCCubicBezierTimingFunction(double x1, double y1, double x2, double y2)
  36     : m_curve(x1, y1, x2, y2)
  37 {
  38 }
  39
  40 CCCubicBezierTimingFunction::~CCCubicBezierTimingFunction()
  41 {
  42 }
  43
  44 float CCCubicBezierTimingFunction::getValue(double x) const
  45 {
  46     UnitBezier temp(m_curve);
  47     return static_cast<float>(temp.solve(x, epsilon));
  48 }
  49
  50 PassOwnPtr<CCAnimationCurve> CCCubicBezierTimingFunction::clone() const
  51 {
  52     return adoptPtr(new CCCubicBezierTimingFunction(*this));
  53 }
  54
  55 // These numbers come from http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag.
  56 PassOwnPtr<CCTimingFunction> CCEaseTimingFunction::create()
  57 {
  58     return CCCubicBezierTimingFunction::create(0.25, 0.1, 0.25, 1);
  59 }
  60
  61 PassOwnPtr<CCTimingFunction> CCEaseInTimingFunction::create()
  62 {
  63     return CCCubicBezierTimingFunction::create(0.42, 0, 1.0, 1);
  64 }
  65
  66 PassOwnPtr<CCTimingFunction> CCEaseOutTimingFunction::create()
  67 {
  68     return CCCubicBezierTimingFunction::create(0, 0, 0.58, 1);
  69 }
  70
  71 PassOwnPtr<CCTimingFunction> CCEaseInOutTimingFunction::create()
  72 {
  73     return CCCubicBezierTimingFunction::create(0.42, 0, 0.58, 1);
  74 }
  75
  76 } // namespace cc