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/
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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.
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21 : * Contributor(s):
22 : *
23 : * Alternatively, the contents of this file may be used under the terms of
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25 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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35 : * ***** END LICENSE BLOCK ***** */
36 :
37 : #include "SVGViewBoxSMILType.h"
38 : #include "nsSMILValue.h"
39 : #include "nsSVGViewBox.h"
40 : #include "nsDebug.h"
41 : #include <math.h>
42 :
43 : namespace mozilla {
44 :
45 1464 : /*static*/ SVGViewBoxSMILType SVGViewBoxSMILType::sSingleton;
46 :
47 : void
48 0 : SVGViewBoxSMILType::Init(nsSMILValue& aValue) const
49 : {
50 0 : NS_ABORT_IF_FALSE(aValue.IsNull(), "Unexpected value type");
51 :
52 0 : nsSVGViewBoxRect* viewBox = new nsSVGViewBoxRect();
53 0 : aValue.mU.mPtr = viewBox;
54 0 : aValue.mType = this;
55 0 : }
56 :
57 : void
58 0 : SVGViewBoxSMILType::Destroy(nsSMILValue& aValue) const
59 : {
60 0 : NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
61 0 : delete static_cast<nsSVGViewBoxRect*>(aValue.mU.mPtr);
62 0 : aValue.mU.mPtr = nsnull;
63 0 : aValue.mType = &nsSMILNullType::sSingleton;
64 0 : }
65 :
66 : nsresult
67 0 : SVGViewBoxSMILType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
68 : {
69 0 : NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
70 0 : NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
71 :
72 0 : const nsSVGViewBoxRect* src = static_cast<const nsSVGViewBoxRect*>(aSrc.mU.mPtr);
73 0 : nsSVGViewBoxRect* dst = static_cast<nsSVGViewBoxRect*>(aDest.mU.mPtr);
74 0 : *dst = *src;
75 0 : return NS_OK;
76 : }
77 :
78 : bool
79 0 : SVGViewBoxSMILType::IsEqual(const nsSMILValue& aLeft,
80 : const nsSMILValue& aRight) const
81 : {
82 0 : NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
83 0 : NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
84 :
85 : const nsSVGViewBoxRect* leftBox =
86 0 : static_cast<const nsSVGViewBoxRect*>(aLeft.mU.mPtr);
87 : const nsSVGViewBoxRect* rightBox =
88 0 : static_cast<nsSVGViewBoxRect*>(aRight.mU.mPtr);
89 0 : return *leftBox == *rightBox;
90 : }
91 :
92 : nsresult
93 0 : SVGViewBoxSMILType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
94 : PRUint32 aCount) const
95 : {
96 0 : NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
97 : "Trying to add invalid types");
98 0 : NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
99 :
100 : // See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c3 and the two
101 : // comments that follow that one for arguments for and against allowing
102 : // viewBox to be additive.
103 :
104 0 : return NS_ERROR_FAILURE;
105 : }
106 :
107 : nsresult
108 0 : SVGViewBoxSMILType::ComputeDistance(const nsSMILValue& aFrom,
109 : const nsSMILValue& aTo,
110 : double& aDistance) const
111 : {
112 0 : NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
113 0 : NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
114 :
115 0 : const nsSVGViewBoxRect* from = static_cast<const nsSVGViewBoxRect*>(aFrom.mU.mPtr);
116 0 : const nsSVGViewBoxRect* to = static_cast<const nsSVGViewBoxRect*>(aTo.mU.mPtr);
117 :
118 : // We use the distances between the edges rather than the difference between
119 : // the x, y, width and height for the "distance". This is necessary in
120 : // order for the "distance" result that we calculate to be the same for a
121 : // given change in the left side as it is for an equal change in the opposite
122 : // side. See https://bugzilla.mozilla.org/show_bug.cgi?id=541884#c12
123 :
124 0 : float dLeft = to->x - from->x;
125 0 : float dTop = to->y - from->y;
126 0 : float dRight = ( to->x + to->width ) - ( from->x + from->width );
127 0 : float dBottom = ( to->y + to->height ) - ( from->y + from->height );
128 :
129 0 : aDistance = sqrt(dLeft*dLeft + dTop*dTop + dRight*dRight + dBottom*dBottom);
130 :
131 0 : return NS_OK;
132 : }
133 :
134 : nsresult
135 0 : SVGViewBoxSMILType::Interpolate(const nsSMILValue& aStartVal,
136 : const nsSMILValue& aEndVal,
137 : double aUnitDistance,
138 : nsSMILValue& aResult) const
139 : {
140 0 : NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
141 : "Trying to interpolate different types");
142 0 : NS_PRECONDITION(aStartVal.mType == this,
143 : "Unexpected types for interpolation");
144 0 : NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
145 :
146 0 : const nsSVGViewBoxRect* start = static_cast<const nsSVGViewBoxRect*>(aStartVal.mU.mPtr);
147 0 : const nsSVGViewBoxRect* end = static_cast<const nsSVGViewBoxRect*>(aEndVal.mU.mPtr);
148 0 : nsSVGViewBoxRect* current = static_cast<nsSVGViewBoxRect*>(aResult.mU.mPtr);
149 :
150 0 : float x = (start->x + (end->x - start->x) * aUnitDistance);
151 0 : float y = (start->y + (end->y - start->y) * aUnitDistance);
152 0 : float width = (start->width + (end->width - start->width) * aUnitDistance);
153 0 : float height = (start->height + (end->height - start->height) * aUnitDistance);
154 :
155 0 : *current = nsSVGViewBoxRect(x, y, width, height);
156 :
157 0 : return NS_OK;
158 : }
159 :
160 4392 : } // namespace mozilla
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