summaryrefslogtreecommitdiff
path: root/layout/svg/nsSVGEffects.cpp
blob: ca4c5778cee43dc2ae6cc311e4afd0143021f892 (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
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

// Main header first:
#include "nsSVGEffects.h"

// Keep others in (case-insensitive) order:
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.h"
#include "nsCSSFrameConstructor.h"
#include "nsISupportsImpl.h"
#include "nsSVGClipPathFrame.h"
#include "nsSVGPaintServerFrame.h"
#include "nsSVGPathGeometryElement.h"
#include "nsSVGFilterFrame.h"
#include "nsSVGMaskFrame.h"
#include "nsIReflowCallback.h"
#include "nsCycleCollectionParticipant.h"
#include "SVGUseElement.h"

using namespace mozilla;
using namespace mozilla::dom;

void
nsSVGRenderingObserver::StartListening()
{
  Element* target = GetTarget();
  if (target) {
    target->AddMutationObserver(this);
  }
}

void
nsSVGRenderingObserver::StopListening()
{
  Element* target = GetTarget();

  if (target) {
    target->RemoveMutationObserver(this);
    if (mInObserverList) {
      nsSVGEffects::RemoveRenderingObserver(target, this);
      mInObserverList = false;
    }
  }
  NS_ASSERTION(!mInObserverList, "still in an observer list?");
}

static nsSVGRenderingObserverList *
GetObserverList(Element *aElement)
{
  return static_cast<nsSVGRenderingObserverList*>
    (aElement->GetProperty(nsGkAtoms::renderingobserverlist));
}

Element*
nsSVGRenderingObserver::GetReferencedElement()
{
  Element* target = GetTarget();
#ifdef DEBUG
  if (target) {
    nsSVGRenderingObserverList *observerList = GetObserverList(target);
    bool inObserverList = observerList && observerList->Contains(this);
    NS_ASSERTION(inObserverList == mInObserverList, "failed to track whether we're in our referenced element's observer list!");
  } else {
    NS_ASSERTION(!mInObserverList, "In whose observer list are we, then?");
  }
#endif
  if (target && !mInObserverList) {
    nsSVGEffects::AddRenderingObserver(target, this);
    mInObserverList = true;
  }
  return target;
}

nsIFrame*
nsSVGRenderingObserver::GetReferencedFrame()
{
  Element* referencedElement = GetReferencedElement();
  return referencedElement ? referencedElement->GetPrimaryFrame() : nullptr;
}

nsIFrame*
nsSVGRenderingObserver::GetReferencedFrame(nsIAtom* aFrameType, bool* aOK)
{
  nsIFrame* frame = GetReferencedFrame();
  if (frame) {
    if (frame->GetType() == aFrameType)
      return frame;
    if (aOK) {
      *aOK = false;
    }
  }
  return nullptr;
}

void
nsSVGRenderingObserver::InvalidateViaReferencedElement()
{
  mInObserverList = false;
  DoUpdate();
}

void
nsSVGRenderingObserver::NotifyEvictedFromRenderingObserverList()
{
  mInObserverList = false; // We've been removed from rendering-obs. list.
  StopListening();            // Remove ourselves from mutation-obs. list.
}

void
nsSVGRenderingObserver::AttributeChanged(nsIDocument* aDocument,
                                         dom::Element* aElement,
                                         int32_t aNameSpaceID,
                                         nsIAtom* aAttribute,
                                         int32_t aModType,
                                         const nsAttrValue* aOldValue)
{
  // An attribute belonging to the element that we are observing *or one of its
  // descendants* has changed.
  //
  // In the case of observing a gradient element, say, we want to know if any
  // of its 'stop' element children change, but we don't actually want to do
  // anything for changes to SMIL element children, for example. Maybe it's not
  // worth having logic to optimize for that, but in most cases it could be a
  // small check?
  //
  // XXXjwatt: do we really want to blindly break the link between our
  // observers and ourselves for all attribute changes? For non-ID changes
  // surely that is unnecessary.

  DoUpdate();
}

void
nsSVGRenderingObserver::ContentAppended(nsIDocument* aDocument,
                                        nsIContent* aContainer,
                                        nsIContent* aFirstNewContent,
                                        int32_t /* unused */)
{
  DoUpdate();
}

void
nsSVGRenderingObserver::ContentInserted(nsIDocument* aDocument,
                                        nsIContent* aContainer,
                                        nsIContent* aChild,
                                        int32_t /* unused */)
{
  DoUpdate();
}

void
nsSVGRenderingObserver::ContentRemoved(nsIDocument* aDocument,
                                       nsIContent* aContainer,
                                       nsIContent* aChild,
                                       int32_t aIndexInContainer,
                                       nsIContent* aPreviousSibling)
{
  DoUpdate();
}

/**
 * Note that in the current setup there are two separate observer lists.
 *
 * In nsSVGIDRenderingObserver's ctor, the new object adds itself to the
 * mutation observer list maintained by the referenced element. In this way the
 * nsSVGIDRenderingObserver is notified if there are any attribute or content
 * tree changes to the element or any of its *descendants*.
 *
 * In nsSVGIDRenderingObserver::GetReferencedElement() the
 * nsSVGIDRenderingObserver object also adds itself to an
 * nsSVGRenderingObserverList object belonging to the referenced
 * element.
 *
 * XXX: it would be nice to have a clear and concise executive summary of the
 * benefits/necessity of maintaining a second observer list.
 */

nsSVGIDRenderingObserver::nsSVGIDRenderingObserver(nsIURI* aURI,
                                                   nsIContent* aObservingContent,
                                                   bool aReferenceImage)
  : mElement(this)
{
  // Start watching the target element
  mElement.Reset(aObservingContent, aURI, true, aReferenceImage);
  StartListening();
}

nsSVGIDRenderingObserver::~nsSVGIDRenderingObserver()
{
  StopListening();
}

void
nsSVGIDRenderingObserver::DoUpdate()
{
  if (mElement.get() && mInObserverList) {
    nsSVGEffects::RemoveRenderingObserver(mElement.get(), this);
    mInObserverList = false;
  }
}

void
nsSVGFrameReferenceFromProperty::Detach()
{
  mFrame = nullptr;
  mFramePresShell = nullptr;
}

nsIFrame*
nsSVGFrameReferenceFromProperty::Get()
{
  if (mFramePresShell && mFramePresShell->IsDestroying()) {
    // mFrame is no longer valid.
    Detach();
  }
  return mFrame;
}

NS_IMPL_ISUPPORTS(nsSVGRenderingObserverProperty, nsIMutationObserver)

void
nsSVGRenderingObserverProperty::DoUpdate()
{
  nsSVGIDRenderingObserver::DoUpdate();

  nsIFrame* frame = mFrameReference.Get();
  if (frame && frame->IsFrameOfType(nsIFrame::eSVG)) {
    // Changes should propagate out to things that might be observing
    // the referencing frame or its ancestors.
    nsLayoutUtils::PostRestyleEvent(
      frame->GetContent()->AsElement(), nsRestyleHint(0),
      nsChangeHint_InvalidateRenderingObservers);
  }
}

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsSVGFilterReference)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsSVGFilterReference)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsSVGFilterReference)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsSVGFilterReference)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsSVGFilterReference)
  tmp->StopListening();
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsSVGFilterReference)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsSVGIDRenderingObserver)
  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
  NS_INTERFACE_MAP_ENTRY(nsISVGFilterReference)
NS_INTERFACE_MAP_END

nsSVGFilterFrame *
nsSVGFilterReference::GetFilterFrame()
{
  return static_cast<nsSVGFilterFrame *>
    (GetReferencedFrame(nsGkAtoms::svgFilterFrame, nullptr));
}

void
nsSVGFilterReference::DoUpdate()
{
  nsSVGIDRenderingObserver::DoUpdate();

  if (mFilterChainObserver) {
    mFilterChainObserver->Invalidate();
  }
}

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsSVGFilterChainObserver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsSVGFilterChainObserver)

NS_IMPL_CYCLE_COLLECTION_CLASS(nsSVGFilterChainObserver)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsSVGFilterChainObserver)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReferences)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsSVGFilterChainObserver)
  tmp->DetachReferences();
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mReferences);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsSVGFilterChainObserver)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

nsSVGFilterChainObserver::nsSVGFilterChainObserver(const nsTArray<nsStyleFilter>& aFilters,
                                                   nsIContent* aFilteredElement,
                                                   nsIFrame* aFilteredFrame)
{
  for (uint32_t i = 0; i < aFilters.Length(); i++) {
    if (aFilters[i].GetType() != NS_STYLE_FILTER_URL)
      continue;

    // aFilteredFrame can be null if this filter belongs to a
    // CanvasRenderingContext2D.
    nsCOMPtr<nsIURI> filterURL = aFilteredFrame
      ? nsSVGEffects::GetFilterURI(aFilteredFrame, i)
      : aFilters[i].GetURL()->ResolveLocalRef(aFilteredElement);

    RefPtr<nsSVGFilterReference> reference =
      new nsSVGFilterReference(filterURL, aFilteredElement, this);
    mReferences.AppendElement(reference);
  }
}

nsSVGFilterChainObserver::~nsSVGFilterChainObserver()
{
  DetachReferences();
}

bool
nsSVGFilterChainObserver::ReferencesValidResources()
{
  for (uint32_t i = 0; i < mReferences.Length(); i++) {
    if (!mReferences[i]->ReferencesValidResource())
      return false;
  }
  return true;
}

bool
nsSVGFilterChainObserver::IsInObserverLists() const
{
  for (uint32_t i = 0; i < mReferences.Length(); i++) {
    if (!mReferences[i]->IsInObserverList())
      return false;
  }
  return true;
}

void
nsSVGFilterProperty::DoUpdate()
{
  nsIFrame* frame = mFrameReference.Get();
  if (!frame)
    return;

  // Repaint asynchronously in case the filter frame is being torn down
  nsChangeHint changeHint =
    nsChangeHint(nsChangeHint_RepaintFrame);

  if (frame && frame->IsFrameOfType(nsIFrame::eSVG)) {
    // Changes should propagate out to things that might be observing
    // the referencing frame or its ancestors.
    changeHint |= nsChangeHint_InvalidateRenderingObservers;
  }

  // Don't need to request UpdateOverflow if we're being reflowed.
  if (!(frame->GetStateBits() & NS_FRAME_IN_REFLOW)) {
    changeHint |= nsChangeHint_UpdateOverflow;
  }
  frame->PresContext()->RestyleManager()->PostRestyleEvent(
    frame->GetContent()->AsElement(), nsRestyleHint(0), changeHint);
}

void
nsSVGMarkerProperty::DoUpdate()
{
  nsSVGRenderingObserverProperty::DoUpdate();

  nsIFrame* frame = mFrameReference.Get();
  if (!frame)
    return;

  NS_ASSERTION(frame->IsFrameOfType(nsIFrame::eSVG), "SVG frame expected");

  // Repaint asynchronously in case the marker frame is being torn down
  nsChangeHint changeHint =
    nsChangeHint(nsChangeHint_RepaintFrame);

  // Don't need to request ReflowFrame if we're being reflowed.
  if (!(frame->GetStateBits() & NS_FRAME_IN_REFLOW)) {
    changeHint |= nsChangeHint_InvalidateRenderingObservers;
    // XXXjwatt: We need to unify SVG into standard reflow so we can just use
    // nsChangeHint_NeedReflow | nsChangeHint_NeedDirtyReflow here.
    // XXXSDL KILL THIS!!!
    nsSVGUtils::ScheduleReflowSVG(frame);
  }
  frame->PresContext()->RestyleManager()->PostRestyleEvent(
    frame->GetContent()->AsElement(), nsRestyleHint(0), changeHint);
}

NS_IMPL_ISUPPORTS(nsSVGMaskProperty, nsISupports)

nsSVGMaskProperty::nsSVGMaskProperty(nsIFrame* aFrame)
{
  const nsStyleSVGReset *svgReset = aFrame->StyleSVGReset();

  for (uint32_t i = 0; i < svgReset->mMask.mImageCount; i++) {
    nsCOMPtr<nsIURI> maskUri = nsSVGEffects::GetMaskURI(aFrame, i);
    nsSVGPaintingProperty* prop = new nsSVGPaintingProperty(maskUri, aFrame,
                                                            false);
    mProperties.AppendElement(prop);
  }
}

bool
nsSVGTextPathProperty::TargetIsValid()
{
  Element* target = GetTarget();
  return target && target->IsSVGElement(nsGkAtoms::path);
}

void
nsSVGTextPathProperty::DoUpdate()
{
  nsSVGRenderingObserverProperty::DoUpdate();

  nsIFrame* frame = mFrameReference.Get();
  if (!frame)
    return;

  NS_ASSERTION(frame->IsFrameOfType(nsIFrame::eSVG) || frame->IsSVGText(),
               "SVG frame expected");

  // Avoid getting into an infinite loop of reflows if the <textPath> is
  // pointing to one of its ancestors.  TargetIsValid returns true iff
  // the target element is a <path> element, and we would not have this
  // nsSVGTextPathProperty if this <textPath> were a descendant of the
  // target <path>.
  //
  // Note that we still have to post the restyle event when we
  // change from being valid to invalid, so that mPositions on the
  // SVGTextFrame gets updated, skipping the <textPath>, ensuring
  // that nothing gets painted for that element.
  bool nowValid = TargetIsValid();
  if (!mValid && !nowValid) {
    // Just return if we were previously invalid, and are still invalid.
    return;
  }
  mValid = nowValid;

  // Repaint asynchronously in case the path frame is being torn down
  nsChangeHint changeHint =
    nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_UpdateTextPath);
  frame->PresContext()->RestyleManager()->PostRestyleEvent(
    frame->GetContent()->AsElement(), nsRestyleHint(0), changeHint);
}

static void
InvalidateAllContinuations(nsIFrame* aFrame)
{
  for (nsIFrame* f = aFrame; f;
       f = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(f)) {
    f->InvalidateFrame();
  }
}

void
nsSVGPaintingProperty::DoUpdate()
{
  nsSVGRenderingObserverProperty::DoUpdate();

  nsIFrame* frame = mFrameReference.Get();
  if (!frame)
    return;

  if (frame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
    nsLayoutUtils::PostRestyleEvent(
      frame->GetContent()->AsElement(), nsRestyleHint(0),
      nsChangeHint_InvalidateRenderingObservers);
    frame->InvalidateFrameSubtree();
  } else {
    InvalidateAllContinuations(frame);
  }
}

static nsSVGFilterProperty*
GetOrCreateFilterProperty(nsIFrame* aFrame)
{
  const nsStyleEffects* effects = aFrame->StyleEffects();
  if (!effects->HasFilters())
    return nullptr;

  nsSVGFilterProperty *prop =
    aFrame->GetProperty(nsSVGEffects::FilterProperty());
  if (prop)
    return prop;
  prop = new nsSVGFilterProperty(effects->mFilters, aFrame);
  NS_ADDREF(prop);
  aFrame->SetProperty(nsSVGEffects::FilterProperty(), prop);
  return prop;
}

static nsSVGMaskProperty*
GetOrCreateMaskProperty(nsIFrame* aFrame)
{
  nsSVGMaskProperty *prop = aFrame->GetProperty(nsSVGEffects::MaskProperty());
  if (prop)
    return prop;

  prop = new nsSVGMaskProperty(aFrame);
  NS_ADDREF(prop);
  aFrame->SetProperty(nsSVGEffects::MaskProperty(), prop);
  return prop;
}

template<class T>
static T*
GetEffectProperty(nsIURI* aURI, nsIFrame* aFrame,
  const mozilla::FramePropertyDescriptor<T>* aProperty)
{
  if (!aURI)
    return nullptr;

  T* prop = aFrame->GetProperty(aProperty);
  if (prop)
    return prop;
  prop = new T(aURI, aFrame, false);
  NS_ADDREF(prop);
  aFrame->SetProperty(aProperty, prop);
  return prop;
}

nsSVGMarkerProperty*
nsSVGEffects::GetMarkerProperty(nsIURI* aURI, nsIFrame* aFrame,
  const mozilla::FramePropertyDescriptor<nsSVGMarkerProperty>* aProperty)
{
  MOZ_ASSERT(aFrame->GetType() == nsGkAtoms::svgPathGeometryFrame &&
             static_cast<nsSVGPathGeometryElement*>(aFrame->GetContent())->IsMarkable(),
             "Bad frame");
  return GetEffectProperty(aURI, aFrame, aProperty);
}

nsSVGTextPathProperty*
nsSVGEffects::GetTextPathProperty(nsIURI* aURI, nsIFrame* aFrame,
  const mozilla::FramePropertyDescriptor<nsSVGTextPathProperty>* aProperty)
{
  return GetEffectProperty(aURI, aFrame, aProperty);
}

nsSVGPaintingProperty*
nsSVGEffects::GetPaintingProperty(nsIURI* aURI, nsIFrame* aFrame,
  const mozilla::FramePropertyDescriptor<nsSVGPaintingProperty>* aProperty)
{
  return GetEffectProperty(aURI, aFrame, aProperty);
}

nsSVGPaintingProperty*
nsSVGEffects::GetPaintingPropertyForURI(nsIURI* aURI, nsIFrame* aFrame,
  URIObserverHashtablePropertyDescriptor aProperty)
{
  if (!aURI)
    return nullptr;

  nsSVGEffects::URIObserverHashtable *hashtable =
    aFrame->GetProperty(aProperty);
  if (!hashtable) {
    hashtable = new nsSVGEffects::URIObserverHashtable();
    aFrame->SetProperty(aProperty, hashtable);
  }
  nsSVGPaintingProperty* prop =
    static_cast<nsSVGPaintingProperty*>(hashtable->GetWeak(aURI));
  if (!prop) {
    bool watchImage = aProperty == nsSVGEffects::BackgroundImageProperty();
    prop = new nsSVGPaintingProperty(aURI, aFrame, watchImage);
    hashtable->Put(aURI, prop);
  }
  return prop;
}

nsSVGEffects::EffectProperties
nsSVGEffects::GetEffectProperties(nsIFrame* aFrame)
{
  NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame should be first continuation");

  EffectProperties result;
  const nsStyleSVGReset *style = aFrame->StyleSVGReset();

  result.mFilter = GetOrCreateFilterProperty(aFrame);

  if (style->mClipPath.GetType() == StyleShapeSourceType::URL) {
    nsCOMPtr<nsIURI> pathURI = nsSVGEffects::GetClipPathURI(aFrame);
    result.mClipPath =
      GetPaintingProperty(pathURI, aFrame, ClipPathProperty());
  } else {
    result.mClipPath = nullptr;
  }

  MOZ_ASSERT(style->mMask.mImageCount > 0);
  result.mMask = style->mMask.HasLayerWithImage()
                 ? GetOrCreateMaskProperty(aFrame) : nullptr;

  return result;
}

nsSVGPaintServerFrame *
nsSVGEffects::GetPaintServer(nsIFrame* aTargetFrame,
                             nsStyleSVGPaint nsStyleSVG::* aPaint,
                             PaintingPropertyDescriptor aType)
{
  const nsStyleSVG* svgStyle = aTargetFrame->StyleSVG();
  if ((svgStyle->*aPaint).Type() != eStyleSVGPaintType_Server)
    return nullptr;

  // If we're looking at a frame within SVG text, then we need to look up
  // to find the right frame to get the painting property off.  We should at
  // least look up past a text frame, and if the text frame's parent is the
  // anonymous block frame, then we look up to its parent (the SVGTextFrame).
  nsIFrame* frame = aTargetFrame;
  if (frame->GetContent()->IsNodeOfType(nsINode::eTEXT)) {
    frame = frame->GetParent();
    nsIFrame* grandparent = frame->GetParent();
    if (grandparent && grandparent->GetType() == nsGkAtoms::svgTextFrame) {
      frame = grandparent;
    }
  }

  nsCOMPtr<nsIURI> paintServerURL = nsSVGEffects::GetPaintURI(frame, aPaint);
  nsSVGPaintingProperty *property =
    nsSVGEffects::GetPaintingProperty(paintServerURL, frame, aType);
  if (!property)
    return nullptr;
  nsIFrame *result = property->GetReferencedFrame();
  if (!result)
    return nullptr;

  nsIAtom *type = result->GetType();
  if (type != nsGkAtoms::svgLinearGradientFrame &&
      type != nsGkAtoms::svgRadialGradientFrame &&
      type != nsGkAtoms::svgPatternFrame)
    return nullptr;

  return static_cast<nsSVGPaintServerFrame*>(result);
}

nsSVGClipPathFrame *
nsSVGEffects::EffectProperties::GetClipPathFrame(bool* aOK)
{
  if (!mClipPath)
    return nullptr;
  nsSVGClipPathFrame *frame = static_cast<nsSVGClipPathFrame *>
    (mClipPath->GetReferencedFrame(nsGkAtoms::svgClipPathFrame, aOK));
  if (frame && aOK && *aOK) {
    *aOK = frame->IsValid();
  }
  return frame;
}

nsSVGMaskFrame *
nsSVGEffects::EffectProperties::GetFirstMaskFrame(bool* aOK)
{
  if (!mMask) {
    return nullptr;
  }

  const nsTArray<RefPtr<nsSVGPaintingProperty>>& props = mMask->GetProps();

  if (props.IsEmpty()) {
    return nullptr;
  }

  return static_cast<nsSVGMaskFrame *>
    (props[0]->GetReferencedFrame(nsGkAtoms::svgMaskFrame, aOK));
}

nsTArray<nsSVGMaskFrame *>
nsSVGEffects::EffectProperties::GetMaskFrames()
{
  nsTArray<nsSVGMaskFrame *> result;
  if (!mMask)
    return result;

  bool ok = false;
  const nsTArray<RefPtr<nsSVGPaintingProperty>>& props = mMask->GetProps();
  for (size_t i = 0; i < props.Length(); i++) {
    nsSVGMaskFrame* maskFrame =
      static_cast<nsSVGMaskFrame *>(props[i]->GetReferencedFrame(
                                                nsGkAtoms::svgMaskFrame, &ok));
    result.AppendElement(maskFrame);
  }

  return result;
}

void
nsSVGEffects::UpdateEffects(nsIFrame* aFrame)
{
  NS_ASSERTION(aFrame->GetContent()->IsElement(),
               "aFrame's content should be an element");

  aFrame->DeleteProperty(FilterProperty());
  aFrame->DeleteProperty(MaskProperty());
  aFrame->DeleteProperty(ClipPathProperty());
  aFrame->DeleteProperty(MarkerBeginProperty());
  aFrame->DeleteProperty(MarkerMiddleProperty());
  aFrame->DeleteProperty(MarkerEndProperty());
  aFrame->DeleteProperty(FillProperty());
  aFrame->DeleteProperty(StrokeProperty());
  aFrame->DeleteProperty(BackgroundImageProperty());

  // Ensure that the filter is repainted correctly
  // We can't do that in DoUpdate as the referenced frame may not be valid
  GetOrCreateFilterProperty(aFrame);

  if (aFrame->GetType() == nsGkAtoms::svgPathGeometryFrame &&
      static_cast<nsSVGPathGeometryElement*>(aFrame->GetContent())->IsMarkable()) {
    // Set marker properties here to avoid reference loops
    nsCOMPtr<nsIURI> markerURL =
      GetMarkerURI(aFrame, &nsStyleSVG::mMarkerStart);
    GetMarkerProperty(markerURL, aFrame, MarkerBeginProperty());
    markerURL = GetMarkerURI(aFrame, &nsStyleSVG::mMarkerMid);
    GetMarkerProperty(markerURL, aFrame, MarkerMiddleProperty());
    markerURL = GetMarkerURI(aFrame, &nsStyleSVG::mMarkerEnd);
    GetMarkerProperty(markerURL, aFrame, MarkerEndProperty());
  }
}

nsSVGFilterProperty*
nsSVGEffects::GetFilterProperty(nsIFrame* aFrame)
{
  NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame should be first continuation");

  if (!aFrame->StyleEffects()->HasFilters())
    return nullptr;

  return aFrame->GetProperty(FilterProperty());
}

void
nsSVGRenderingObserverList::InvalidateAll()
{
  if (mObservers.Count() == 0)
    return;

  AutoTArray<nsSVGRenderingObserver*,10> observers;

  for (auto it = mObservers.Iter(); !it.Done(); it.Next()) {
    observers.AppendElement(it.Get()->GetKey());
  }
  mObservers.Clear();

  for (uint32_t i = 0; i < observers.Length(); ++i) {
    observers[i]->InvalidateViaReferencedElement();
  }
}

void
nsSVGRenderingObserverList::InvalidateAllForReflow()
{
  if (mObservers.Count() == 0)
    return;

  AutoTArray<nsSVGRenderingObserver*,10> observers;

  for (auto it = mObservers.Iter(); !it.Done(); it.Next()) {
    nsSVGRenderingObserver* obs = it.Get()->GetKey();
    if (obs->ObservesReflow()) {
      observers.AppendElement(obs);
      it.Remove();
    }
  }

  for (uint32_t i = 0; i < observers.Length(); ++i) {
    observers[i]->InvalidateViaReferencedElement();
  }
}

void
nsSVGRenderingObserverList::RemoveAll()
{
  AutoTArray<nsSVGRenderingObserver*,10> observers;

  for (auto it = mObservers.Iter(); !it.Done(); it.Next()) {
    observers.AppendElement(it.Get()->GetKey());
  }
  mObservers.Clear();

  // Our list is now cleared.  We need to notify the observers we've removed,
  // so they can update their state & remove themselves as mutation-observers.
  for (uint32_t i = 0; i < observers.Length(); ++i) {
    observers[i]->NotifyEvictedFromRenderingObserverList();
  }
}

void
nsSVGEffects::AddRenderingObserver(Element* aElement,
                                   nsSVGRenderingObserver* aObserver)
{
  nsSVGRenderingObserverList *observerList = GetObserverList(aElement);
  if (!observerList) {
    observerList = new nsSVGRenderingObserverList();
    if (!observerList)
      return;
    aElement->SetProperty(nsGkAtoms::renderingobserverlist, observerList,
                          nsINode::DeleteProperty<nsSVGRenderingObserverList>);
  }
  aElement->SetHasRenderingObservers(true);
  observerList->Add(aObserver);
}

void
nsSVGEffects::RemoveRenderingObserver(Element* aElement,
                                      nsSVGRenderingObserver* aObserver)
{
  nsSVGRenderingObserverList *observerList = GetObserverList(aElement);
  if (observerList) {
    NS_ASSERTION(observerList->Contains(aObserver),
                 "removing observer from an element we're not observing?");
    observerList->Remove(aObserver);
    if (observerList->IsEmpty()) {
      aElement->SetHasRenderingObservers(false);
    }
  }
}

void
nsSVGEffects::RemoveAllRenderingObservers(Element* aElement)
{
  nsSVGRenderingObserverList *observerList = GetObserverList(aElement);
  if (observerList) {
    observerList->RemoveAll();
    aElement->SetHasRenderingObservers(false);
  }
}

void
nsSVGEffects::InvalidateRenderingObservers(nsIFrame* aFrame)
{
  NS_ASSERTION(!aFrame->GetPrevContinuation(), "aFrame must be first continuation");

  nsIContent* content = aFrame->GetContent();
  if (!content || !content->IsElement())
    return;

  // If the rendering has changed, the bounds may well have changed too:
  aFrame->DeleteProperty(nsSVGUtils::ObjectBoundingBoxProperty());

  nsSVGRenderingObserverList *observerList =
    GetObserverList(content->AsElement());
  if (observerList) {
    observerList->InvalidateAll();
    return;
  }

  // Check ancestor SVG containers. The root frame cannot be of type
  // eSVGContainer so we don't have to check f for null here.
  for (nsIFrame *f = aFrame->GetParent();
       f->IsFrameOfType(nsIFrame::eSVGContainer); f = f->GetParent()) {
    if (f->GetContent()->IsElement()) {
      observerList = GetObserverList(f->GetContent()->AsElement());
      if (observerList) {
        observerList->InvalidateAll();
        return;
      }
    }
  }
}

void
nsSVGEffects::InvalidateDirectRenderingObservers(Element* aElement, uint32_t aFlags /* = 0 */)
{
  nsIFrame* frame = aElement->GetPrimaryFrame();
  if (frame) {
    // If the rendering has changed, the bounds may well have changed too:
    frame->DeleteProperty(nsSVGUtils::ObjectBoundingBoxProperty());
  }

  if (aElement->HasRenderingObservers()) {
    nsSVGRenderingObserverList *observerList = GetObserverList(aElement);
    if (observerList) {
      if (aFlags & INVALIDATE_REFLOW) {
        observerList->InvalidateAllForReflow();
      } else {
        observerList->InvalidateAll();
      }
    }
  }
}

void
nsSVGEffects::InvalidateDirectRenderingObservers(nsIFrame* aFrame, uint32_t aFlags /* = 0 */)
{
  nsIContent* content = aFrame->GetContent();
  if (content && content->IsElement()) {
    InvalidateDirectRenderingObservers(content->AsElement(), aFlags);
  }
}

already_AddRefed<nsIURI>
nsSVGEffects::GetBaseURLForLocalRef(nsIContent* content, nsIURI* aDocURI)
{
  MOZ_ASSERT(content);

  // For a local-reference URL, resolve that fragment against the current
  // document that relative URLs are resolved against.
  nsCOMPtr<nsIURI> baseURI = content->OwnerDoc()->GetDocumentURI();

  if (content->IsInAnonymousSubtree()) {
    nsIContent* bindingParent = content->GetBindingParent();
    nsCOMPtr<nsIURI> originalURI;

    // content is in a shadow tree.  If this URL was specified in the subtree
    // referenced by the <use>(or -moz-binding) element, and that subtree came
    // from a separate resource document, then we want the fragment-only URL
    // to resolve to an element from the resource document.  Otherwise, the
    // URL was specified somewhere in the document with the <use> element, and
    // we want the fragment-only URL to resolve to an element in that document.
    if (bindingParent) {
      if (content->IsAnonymousContentInSVGUseSubtree()) {
        SVGUseElement* useElement = static_cast<SVGUseElement*>(bindingParent);
        originalURI = useElement->GetSourceDocURI();
      } else {
        nsXBLBinding* binding = bindingParent->GetXBLBinding();
        if (binding) {
          originalURI = binding->GetSourceDocURI();
        } else {
          MOZ_ASSERT(content->IsInNativeAnonymousSubtree(),
                     "an non-native anonymous tree which is not from "
                     "an XBL binding?");
        }
      }

      if (originalURI) {
        bool isEqualsExceptRef = false;
        aDocURI->EqualsExceptRef(originalURI, &isEqualsExceptRef);
        if (isEqualsExceptRef) {
          baseURI = originalURI;
        }
      }
    }
  }

  return baseURI.forget();
}

static already_AddRefed<nsIURI>
ResolveURLUsingLocalRef(nsIFrame* aFrame, const css::URLValueData* aURL)
{
  MOZ_ASSERT(aFrame);

  if (!aURL) {
    return nullptr;
  }

  // Non-local-reference URL.
  if (!aURL->IsLocalRef()) {
    nsCOMPtr<nsIURI> result = aURL->GetURI();
    return result.forget();
  }

  nsCOMPtr<nsIURI> baseURI =
    nsSVGEffects::GetBaseURLForLocalRef(aFrame->GetContent(), aURL->GetURI());

  return aURL->ResolveLocalRef(baseURI);
}

already_AddRefed<nsIURI>
nsSVGEffects::GetMarkerURI(nsIFrame* aFrame,
                           RefPtr<css::URLValue> nsStyleSVG::* aMarker)
{
  return ResolveURLUsingLocalRef(aFrame, aFrame->StyleSVG()->*aMarker);
}

already_AddRefed<nsIURI>
nsSVGEffects::GetClipPathURI(nsIFrame* aFrame)
{
  const nsStyleSVGReset* svgResetStyle = aFrame->StyleSVGReset();
  MOZ_ASSERT(svgResetStyle->mClipPath.GetType() == StyleShapeSourceType::URL);

  css::URLValue* url = svgResetStyle->mClipPath.GetURL();
  return ResolveURLUsingLocalRef(aFrame, url);
}

already_AddRefed<nsIURI>
nsSVGEffects::GetFilterURI(nsIFrame* aFrame, uint32_t aIndex)
{
  const nsStyleEffects* effects = aFrame->StyleEffects();
  MOZ_ASSERT(effects->mFilters.Length() > aIndex);
  MOZ_ASSERT(effects->mFilters[aIndex].GetType() == NS_STYLE_FILTER_URL);

  return ResolveURLUsingLocalRef(aFrame, effects->mFilters[aIndex].GetURL());
}

already_AddRefed<nsIURI>
nsSVGEffects::GetFilterURI(nsIFrame* aFrame, const nsStyleFilter& aFilter)
{
  MOZ_ASSERT(aFrame->StyleEffects()->mFilters.Length());
  MOZ_ASSERT(aFilter.GetType() == NS_STYLE_FILTER_URL);

  return ResolveURLUsingLocalRef(aFrame, aFilter.GetURL());
}

already_AddRefed<nsIURI>
nsSVGEffects::GetPaintURI(nsIFrame* aFrame,
                          nsStyleSVGPaint nsStyleSVG::* aPaint)
{
  const nsStyleSVG* svgStyle = aFrame->StyleSVG();
  MOZ_ASSERT((svgStyle->*aPaint).Type() ==
             nsStyleSVGPaintType::eStyleSVGPaintType_Server);

  return ResolveURLUsingLocalRef(aFrame,
                                 (svgStyle->*aPaint).GetPaintServer());
}

already_AddRefed<nsIURI>
nsSVGEffects::GetMaskURI(nsIFrame* aFrame, uint32_t aIndex)
{
  const nsStyleSVGReset* svgReset = aFrame->StyleSVGReset();
  MOZ_ASSERT(svgReset->mMask.mLayers.Length() > aIndex);

  return ResolveURLUsingLocalRef(aFrame,
                                 svgReset->mMask.mLayers[aIndex].mSourceURI);
}