1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is the Mozilla SVG project.
16 : *
17 : * The Initial Developer of the Original Code is the Mozilla Corporation.
18 : * Portions created by the Initial Developer are Copyright (C) 2009
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : *
23 : * Alternatively, the contents of this file may be used under the terms of
24 : * either of the GNU General Public License Version 2 or later (the "GPL"),
25 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26 : * in which case the provisions of the GPL or the LGPL are applicable instead
27 : * of those above. If you wish to allow use of your version of this file only
28 : * under the terms of either the GPL or the LGPL, and not to allow others to
29 : * use your version of this file under the terms of the MPL, indicate your
30 : * decision by deleting the provisions above and replace them with the notice
31 : * and other provisions required by the GPL or the LGPL. If you do not delete
32 : * the provisions above, a recipient may use your version of this file under
33 : * the terms of any one of the MPL, the GPL or the LGPL.
34 : *
35 : * ***** END LICENSE BLOCK ***** */
36 :
37 : #include "SMILIntegerType.h"
38 : #include "nsSMILValue.h"
39 : #include "nsDebug.h"
40 : #include <math.h>
41 :
42 : namespace mozilla {
43 :
44 1464 : /*static*/ SMILIntegerType SMILIntegerType::sSingleton;
45 :
46 : void
47 0 : SMILIntegerType::Init(nsSMILValue& aValue) const
48 : {
49 0 : NS_ABORT_IF_FALSE(aValue.IsNull(), "Unexpected value type");
50 0 : aValue.mU.mInt = 0;
51 0 : aValue.mType = this;
52 0 : }
53 :
54 : void
55 0 : SMILIntegerType::Destroy(nsSMILValue& aValue) const
56 : {
57 0 : NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
58 0 : aValue.mU.mInt = 0;
59 0 : aValue.mType = &nsSMILNullType::sSingleton;
60 0 : }
61 :
62 : nsresult
63 0 : SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
64 : {
65 0 : NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
66 0 : NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
67 0 : aDest.mU.mInt = aSrc.mU.mInt;
68 0 : return NS_OK;
69 : }
70 :
71 : bool
72 0 : SMILIntegerType::IsEqual(const nsSMILValue& aLeft,
73 : const nsSMILValue& aRight) const
74 : {
75 0 : NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
76 0 : NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
77 :
78 0 : return aLeft.mU.mInt == aRight.mU.mInt;
79 : }
80 :
81 : nsresult
82 0 : SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
83 : PRUint32 aCount) const
84 : {
85 0 : NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
86 : "Trying to add invalid types");
87 0 : NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
88 0 : aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;
89 0 : return NS_OK;
90 : }
91 :
92 : nsresult
93 0 : SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,
94 : const nsSMILValue& aTo,
95 : double& aDistance) const
96 : {
97 0 : NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
98 0 : NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
99 0 : aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));
100 0 : return NS_OK;
101 : }
102 :
103 : nsresult
104 0 : SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,
105 : const nsSMILValue& aEndVal,
106 : double aUnitDistance,
107 : nsSMILValue& aResult) const
108 : {
109 0 : NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
110 : "Trying to interpolate different types");
111 0 : NS_PRECONDITION(aStartVal.mType == this,
112 : "Unexpected types for interpolation");
113 0 : NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
114 :
115 0 : const double startVal = double(aStartVal.mU.mInt);
116 0 : const double endVal = double(aEndVal.mU.mInt);
117 0 : const double currentVal = startVal + (endVal - startVal) * aUnitDistance;
118 :
119 : // When currentVal is exactly midway between its two nearest integers, we
120 : // jump to the "next" integer to provide simple, easy to remember and
121 : // consistent behaviour (from the SMIL author's point of view).
122 :
123 0 : if (startVal < endVal) {
124 0 : aResult.mU.mInt = PRInt64(floor(currentVal + 0.5)); // round mid up
125 : } else {
126 0 : aResult.mU.mInt = PRInt64(ceil(currentVal - 0.5)); // round mid down
127 : }
128 :
129 0 : return NS_OK;
130 : }
131 :
132 4392 : } // namespace mozilla
|