summaryrefslogtreecommitdiffstats
path: root/dom/smil/nsSMILFloatType.cpp
blob: d3e2980430edd25e12fcf2217e3edd3ebdf84a9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsSMILFloatType.h"
#include "nsSMILValue.h"
#include "nsDebug.h"
#include <math.h>

void
nsSMILFloatType::Init(nsSMILValue& aValue) const
{
  NS_PRECONDITION(aValue.IsNull(), "Unexpected value type");
  aValue.mU.mDouble = 0.0;
  aValue.mType = this;
}

void
nsSMILFloatType::Destroy(nsSMILValue& aValue) const
{
  NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
  aValue.mU.mDouble = 0.0;
  aValue.mType      = nsSMILNullType::Singleton();
}

nsresult
nsSMILFloatType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
{
  NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
  aDest.mU.mDouble = aSrc.mU.mDouble;
  return NS_OK;
}

bool
nsSMILFloatType::IsEqual(const nsSMILValue& aLeft,
                         const nsSMILValue& aRight) const
{
  NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");

  return aLeft.mU.mDouble == aRight.mU.mDouble;
}

nsresult
nsSMILFloatType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
                     uint32_t aCount) const
{
  NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
                  "Trying to add invalid types");
  NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
  aDest.mU.mDouble += aValueToAdd.mU.mDouble * aCount;
  return NS_OK;
}

nsresult
nsSMILFloatType::ComputeDistance(const nsSMILValue& aFrom,
                                 const nsSMILValue& aTo,
                                 double& aDistance) const
{
  NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
  NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");

  const double &from = aFrom.mU.mDouble;
  const double &to   = aTo.mU.mDouble;

  aDistance = fabs(to - from);

  return NS_OK;
}

nsresult
nsSMILFloatType::Interpolate(const nsSMILValue& aStartVal,
                             const nsSMILValue& aEndVal,
                             double aUnitDistance,
                             nsSMILValue& aResult) const
{
  NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
      "Trying to interpolate different types");
  NS_PRECONDITION(aStartVal.mType == this,
      "Unexpected types for interpolation");
  NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");

  const double &startVal = aStartVal.mU.mDouble;
  const double &endVal   = aEndVal.mU.mDouble;

  aResult.mU.mDouble = (startVal + (endVal - startVal) * aUnitDistance);

  return NS_OK;
}