summaryrefslogtreecommitdiffstats
path: root/dom/svg/nsSVGAnimatedTransformList.cpp
blob: b5933faef7d4396437311e2a7711f7123f6ad2ed (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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
/* -*- 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 "nsSVGAnimatedTransformList.h"

#include "mozilla/dom/SVGAnimatedTransformList.h"
#include "mozilla/dom/SVGAnimationElement.h"
#include "mozilla/Move.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsSVGTransform.h"
#include "nsSMILValue.h"
#include "SVGContentUtils.h"
#include "SVGTransformListSMILType.h"
#include "nsIDOMMutationEvent.h"

namespace mozilla {

using namespace dom;

nsresult
nsSVGAnimatedTransformList::SetBaseValueString(const nsAString& aValue)
{
  SVGTransformList newBaseValue;
  nsresult rv = newBaseValue.SetValueFromString(aValue);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return SetBaseValue(newBaseValue);
}

nsresult
nsSVGAnimatedTransformList::SetBaseValue(const SVGTransformList& aValue)
{
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // We must send this notification *before* changing mBaseVal! If the length
    // of our baseVal is being reduced, our baseVal's DOM wrapper list may have
    // to remove DOM items from itself, and any removed DOM items need to copy
    // their internal counterpart values *before* we change them.
    //
    domWrapper->InternalBaseValListWillChangeLengthTo(aValue.Length());
  }

  // (This bool will be copied to our member-var, if attr-change succeeds.)
  bool hadTransform = HasTransform();

  // We don't need to call DidChange* here - we're only called by
  // nsSVGElement::ParseAttribute under Element::SetAttr,
  // which takes care of notifying.

  nsresult rv = mBaseVal.CopyFrom(aValue);
  if (NS_FAILED(rv) && domWrapper) {
    // Attempting to increase mBaseVal's length failed - reduce domWrapper
    // back to the same length:
    domWrapper->InternalBaseValListWillChangeLengthTo(mBaseVal.Length());
  } else {
    mIsAttrSet = true;
    mHadTransformBeforeLastBaseValChange = hadTransform;
  }
  return rv;
}

void
nsSVGAnimatedTransformList::ClearBaseValue()
{
  mHadTransformBeforeLastBaseValChange = HasTransform();

  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // We must send this notification *before* changing mBaseVal! (See above.)
    domWrapper->InternalBaseValListWillChangeLengthTo(0);
  }
  mBaseVal.Clear();
  mIsAttrSet = false;
  // Caller notifies
}

nsresult
nsSVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
                                         nsSVGElement *aElement)
{
  bool prevSet = HasTransform() || aElement->GetAnimateMotionTransform();
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // A new animation may totally change the number of items in the animVal
    // list, replacing what was essentially a mirror of the baseVal list, or
    // else replacing and overriding an existing animation. When this happens
    // we must try and keep our animVal's DOM wrapper in sync (see the comment
    // in SVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo).
    //
    // It's not possible for us to reliably distinguish between calls to this
    // method that are setting a new sample for an existing animation, and
    // calls that are setting the first sample of an animation that will
    // override an existing animation. Happily it's cheap to just blindly
    // notify our animVal's DOM wrapper of its internal counterpart's new value
    // each time this method is called, so that's what we do.
    //
    // Note that we must send this notification *before* setting or changing
    // mAnimVal! (See the comment in SetBaseValueString above.)
    //
    domWrapper->InternalAnimValListWillChangeLengthTo(aValue.Length());
  }
  if (!mAnimVal) {
    mAnimVal = new SVGTransformList();
  }
  nsresult rv = mAnimVal->CopyFrom(aValue);
  if (NS_FAILED(rv)) {
    // OOM. We clear the animation, and, importantly, ClearAnimValue() ensures
    // that mAnimVal and its DOM wrapper (if any) will have the same length!
    ClearAnimValue(aElement);
    return rv;
  }
  int32_t modType;
  if(prevSet) {
    modType = nsIDOMMutationEvent::MODIFICATION;
  } else {
    modType = nsIDOMMutationEvent::ADDITION;
  }
  aElement->DidAnimateTransformList(modType);
  return NS_OK;
}

void
nsSVGAnimatedTransformList::ClearAnimValue(nsSVGElement *aElement)
{
  SVGAnimatedTransformList *domWrapper =
    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
  if (domWrapper) {
    // When all animation ends, animVal simply mirrors baseVal, which may have
    // a different number of items to the last active animated value. We must
    // keep the length of our animVal's DOM wrapper list in sync, and again we
    // must do that before touching mAnimVal. See comments above.
    //
    domWrapper->InternalAnimValListWillChangeLengthTo(mBaseVal.Length());
  }
  mAnimVal = nullptr;
  int32_t modType;
  if (HasTransform() || aElement->GetAnimateMotionTransform()) {
    modType = nsIDOMMutationEvent::MODIFICATION;
  } else {
    modType = nsIDOMMutationEvent::REMOVAL;
  }
  aElement->DidAnimateTransformList(modType);
}

bool
nsSVGAnimatedTransformList::IsExplicitlySet() const
{
  // Like other methods of this name, we need to know when a transform value has
  // been explicitly set.
  //
  // There are three ways an animated list can become set:
  // 1) Markup -- we set mIsAttrSet to true on any successful call to
  //    SetBaseValueString and clear it on ClearBaseValue (as called by
  //    nsSVGElement::UnsetAttr or a failed nsSVGElement::ParseAttribute)
  // 2) DOM call -- simply fetching the baseVal doesn't mean the transform value
  //    has been set. It is set if that baseVal has one or more transforms in
  //    the list.
  // 3) Animation -- which will cause the mAnimVal member to be allocated
  return mIsAttrSet || !mBaseVal.IsEmpty() || mAnimVal;
}

nsISMILAttr*
nsSVGAnimatedTransformList::ToSMILAttr(nsSVGElement* aSVGElement)
{
  return new SMILAnimatedTransformList(this, aSVGElement);
}

nsresult
nsSVGAnimatedTransformList::SMILAnimatedTransformList::ValueFromString(
  const nsAString& aStr,
  const dom::SVGAnimationElement* aSrcElement,
  nsSMILValue& aValue,
  bool& aPreventCachingOfSandwich) const
{
  NS_ENSURE_TRUE(aSrcElement, NS_ERROR_FAILURE);
  MOZ_ASSERT(aValue.IsNull(),
             "aValue should have been cleared before calling ValueFromString");

  const nsAttrValue* typeAttr = aSrcElement->GetAnimAttr(nsGkAtoms::type);
  const nsIAtom* transformType = nsGkAtoms::translate; // default val
  if (typeAttr) {
    if (typeAttr->Type() != nsAttrValue::eAtom) {
      // Recognized values of |type| are parsed as an atom -- so if we have
      // something other than an atom, then we know already our |type| is
      // invalid.
      return NS_ERROR_FAILURE;
    }
    transformType = typeAttr->GetAtomValue();
  }

  ParseValue(aStr, transformType, aValue);
  aPreventCachingOfSandwich = false;
  return aValue.IsNull() ? NS_ERROR_FAILURE : NS_OK;
}

void
nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseValue(
  const nsAString& aSpec,
  const nsIAtom* aTransformType,
  nsSMILValue& aResult)
{
  MOZ_ASSERT(aResult.IsNull(), "Unexpected type for SMIL value");

  static_assert(SVGTransformSMILData::NUM_SIMPLE_PARAMS == 3,
                "nsSVGSMILTransform constructor should be expecting array "
                "with 3 params");

  float params[3] = { 0.f };
  int32_t numParsed = ParseParameterList(aSpec, params, 3);
  uint16_t transformType;

  if (aTransformType == nsGkAtoms::translate) {
    // tx [ty=0]
    if (numParsed != 1 && numParsed != 2)
      return;
    transformType = SVG_TRANSFORM_TRANSLATE;
  } else if (aTransformType == nsGkAtoms::scale) {
    // sx [sy=sx]
    if (numParsed != 1 && numParsed != 2)
      return;
    if (numParsed == 1) {
      params[1] = params[0];
    }
    transformType = SVG_TRANSFORM_SCALE;
  } else if (aTransformType == nsGkAtoms::rotate) {
    // r [cx=0 cy=0]
    if (numParsed != 1 && numParsed != 3)
      return;
    transformType = SVG_TRANSFORM_ROTATE;
  } else if (aTransformType == nsGkAtoms::skewX) {
    // x-angle
    if (numParsed != 1)
      return;
    transformType = SVG_TRANSFORM_SKEWX;
  } else if (aTransformType == nsGkAtoms::skewY) {
    // y-angle
    if (numParsed != 1)
      return;
    transformType = SVG_TRANSFORM_SKEWY;
  } else {
    return;
  }

  nsSMILValue val(SVGTransformListSMILType::Singleton());
  SVGTransformSMILData transform(transformType, params);
  if (NS_FAILED(SVGTransformListSMILType::AppendTransform(transform, val))) {
    return; // OOM
  }

  // Success! Populate our outparam with parsed value.
  aResult = Move(val);
}

int32_t
nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseParameterList(
  const nsAString& aSpec,
  float* aVars,
  int32_t aNVars)
{
  nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
    tokenizer(aSpec, ',', nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);

  int numArgsFound = 0;

  while (tokenizer.hasMoreTokens()) {
    float f;
    if (!SVGContentUtils::ParseNumber(tokenizer.nextToken(), f)) {
      return -1;    
    }
    if (numArgsFound < aNVars) {
      aVars[numArgsFound] = f;
    }
    numArgsFound++;
  }
  return numArgsFound;
}

nsSMILValue
nsSVGAnimatedTransformList::SMILAnimatedTransformList::GetBaseValue() const
{
  // To benefit from Return Value Optimization and avoid copy constructor calls
  // due to our use of return-by-value, we must return the exact same object
  // from ALL return points. This function must only return THIS variable:
  nsSMILValue val(SVGTransformListSMILType::Singleton());
  if (!SVGTransformListSMILType::AppendTransforms(mVal->mBaseVal, val)) {
    val = nsSMILValue();
  }

  return val;
}

nsresult
nsSVGAnimatedTransformList::SMILAnimatedTransformList::SetAnimValue(
  const nsSMILValue& aNewAnimValue)
{
  MOZ_ASSERT(aNewAnimValue.mType == SVGTransformListSMILType::Singleton(),
             "Unexpected type to assign animated value");
  SVGTransformList animVal;
  if (!SVGTransformListSMILType::GetTransforms(aNewAnimValue,
                                               animVal.mItems)) {
    return NS_ERROR_FAILURE;
  }

  return mVal->SetAnimValue(animVal, mElement);
}

void
nsSVGAnimatedTransformList::SMILAnimatedTransformList::ClearAnimValue()
{
  if (mVal->mAnimVal) {
    mVal->ClearAnimValue(mElement);
  }
}

} // namespace mozilla