summaryrefslogtreecommitdiffstats
path: root/layout/svg/nsSVGOuterSVGFrame.cpp
blob: 16dfc2b37acc89823ede1995807f888dbd6ffde9 (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
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
/* -*- 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 "nsSVGOuterSVGFrame.h"

// Keep others in (case-insensitive) order:
#include "nsDisplayList.h"
#include "nsIDocument.h"
#include "nsIDOMHTMLIFrameElement.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIObjectLoadingContent.h"
#include "nsRenderingContext.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGForeignObjectFrame.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "mozilla/dom/SVGViewElement.h"
#include "nsSubDocumentFrame.h"
#include "gfxMatrix.h"

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;

//----------------------------------------------------------------------
// Implementation helpers

void
nsSVGOuterSVGFrame::RegisterForeignObject(nsSVGForeignObjectFrame* aFrame)
{
  NS_ASSERTION(aFrame, "Who on earth is calling us?!");

  if (!mForeignObjectHash) {
    mForeignObjectHash = new nsTHashtable<nsPtrHashKey<nsSVGForeignObjectFrame> >();
  }

  NS_ASSERTION(!mForeignObjectHash->GetEntry(aFrame),
               "nsSVGForeignObjectFrame already registered!");

  mForeignObjectHash->PutEntry(aFrame);

  NS_ASSERTION(mForeignObjectHash->GetEntry(aFrame),
               "Failed to register nsSVGForeignObjectFrame!");
}

void
nsSVGOuterSVGFrame::UnregisterForeignObject(nsSVGForeignObjectFrame* aFrame)
{
  NS_ASSERTION(aFrame, "Who on earth is calling us?!");
  NS_ASSERTION(mForeignObjectHash && mForeignObjectHash->GetEntry(aFrame),
               "nsSVGForeignObjectFrame not in registry!");
  return mForeignObjectHash->RemoveEntry(aFrame);
}

//----------------------------------------------------------------------
// Implementation

nsContainerFrame*
NS_NewSVGOuterSVGFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsSVGOuterSVGFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsSVGOuterSVGFrame)

nsSVGOuterSVGFrame::nsSVGOuterSVGFrame(nsStyleContext* aContext)
    : nsSVGDisplayContainerFrame(aContext)
    , mFullZoom(aContext->PresContext()->GetFullZoom())
    , mViewportInitialized(false)
    , mIsRootContent(false)
{
  // Outer-<svg> has CSS layout, so remove this bit:
  RemoveStateBits(NS_FRAME_SVG_LAYOUT);
}

// helper
static inline bool
DependsOnIntrinsicSize(const nsIFrame* aEmbeddingFrame)
{
  const nsStylePosition *pos = aEmbeddingFrame->StylePosition();
  const nsStyleCoord &width = pos->mWidth;
  const nsStyleCoord &height = pos->mHeight;

  // XXX it would be nice to know if the size of aEmbeddingFrame's containing
  // block depends on aEmbeddingFrame, then we'd know if we can return false
  // for eStyleUnit_Percent too.
  return !width.ConvertsToLength() ||
         !height.ConvertsToLength();
}

void
nsSVGOuterSVGFrame::Init(nsIContent*       aContent,
                         nsContainerFrame* aParent,
                         nsIFrame*         aPrevInFlow)
{
  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::svg),
               "Content is not an SVG 'svg' element!");

  AddStateBits(NS_STATE_IS_OUTER_SVG |
               NS_FRAME_FONT_INFLATION_CONTAINER |
               NS_FRAME_FONT_INFLATION_FLOW_ROOT);

  // Check for conditional processing attributes here rather than in
  // nsCSSFrameConstructor::FindSVGData because we want to avoid
  // simply giving failing outer <svg> elements an nsSVGContainerFrame.
  // We don't create other SVG frames if PassesConditionalProcessingTests
  // returns false, but since we do create nsSVGOuterSVGFrame frames we
  // prevent them from painting by [ab]use NS_FRAME_IS_NONDISPLAY. The
  // frame will be recreated via an nsChangeHint_ReconstructFrame restyle if
  // the value returned by PassesConditionalProcessingTests changes.
  SVGSVGElement *svg = static_cast<SVGSVGElement*>(aContent);
  if (!svg->PassesConditionalProcessingTests()) {
    AddStateBits(NS_FRAME_IS_NONDISPLAY);
  }

  nsSVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);

  nsIDocument* doc = mContent->GetUncomposedDoc();
  if (doc) {
    // we only care about our content's zoom and pan values if it's the root element
    if (doc->GetRootElement() == mContent) {
      mIsRootContent = true;

      nsIFrame* embeddingFrame;
      if (IsRootOfReplacedElementSubDoc(&embeddingFrame) && embeddingFrame) {
        if (MOZ_UNLIKELY(!embeddingFrame->HasAllStateBits(NS_FRAME_IS_DIRTY)) &&
            DependsOnIntrinsicSize(embeddingFrame)) {
          // Looks like this document is loading after the embedding element
          // has had its first reflow, and that its size depends on our
          // intrinsic size.  We need it to resize itself to use our (now
          // available) intrinsic size:
          embeddingFrame->PresContext()->PresShell()->
            FrameNeedsReflow(embeddingFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
        }
      }
    }
  }
}

//----------------------------------------------------------------------
// nsQueryFrame methods

NS_QUERYFRAME_HEAD(nsSVGOuterSVGFrame)
  NS_QUERYFRAME_ENTRY(nsISVGSVGFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsSVGDisplayContainerFrame)

//----------------------------------------------------------------------
// nsIFrame methods
//----------------------------------------------------------------------
// reflowing

/* virtual */ nscoord
nsSVGOuterSVGFrame::GetMinISize(nsRenderingContext *aRenderingContext)
{
  nscoord result;
  DISPLAY_MIN_WIDTH(this, result);

  result = nscoord(0);

  return result;
}

/* virtual */ nscoord
nsSVGOuterSVGFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
{
  nscoord result;
  DISPLAY_PREF_WIDTH(this, result);

  SVGSVGElement *svg = static_cast<SVGSVGElement*>(mContent);
  WritingMode wm = GetWritingMode();
  const nsSVGLength2& isize = wm.IsVertical()
    ? svg->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT]
    : svg->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];

  if (isize.IsPercentage()) {
    // It looks like our containing block's isize may depend on our isize. In
    // that case our behavior is undefined according to CSS 2.1 section 10.3.2.
    // As a last resort, we'll fall back to returning zero.
    result = nscoord(0);

    // Returning zero may be unhelpful, however, as it leads to unexpected
    // disappearance of %-sized SVGs in orthogonal contexts, where our
    // containing block wants to shrink-wrap. So let's look for an ancestor
    // with non-zero size in this dimension, and use that as a (somewhat
    // arbitrary) result instead.
    nsIFrame *parent = GetParent();
    while (parent) {
      nscoord parentISize = parent->GetLogicalSize(wm).ISize(wm);
      if (parentISize > 0 && parentISize != NS_UNCONSTRAINEDSIZE) {
        result = parentISize;
        break;
      }
      parent = parent->GetParent();
    }
  } else {
    result = nsPresContext::CSSPixelsToAppUnits(isize.GetAnimValue(svg));
    if (result < 0) {
      result = nscoord(0);
    }
  }

  return result;
}

/* virtual */ IntrinsicSize
nsSVGOuterSVGFrame::GetIntrinsicSize()
{
  // XXXjwatt Note that here we want to return the CSS width/height if they're
  // specified and we're embedded inside an nsIObjectLoadingContent.

  IntrinsicSize intrinsicSize;

  SVGSVGElement *content = static_cast<SVGSVGElement*>(mContent);
  nsSVGLength2 &width  = content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
  nsSVGLength2 &height = content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];

  if (!width.IsPercentage()) {
    nscoord val = nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content));
    if (val < 0) val = 0;
    intrinsicSize.width.SetCoordValue(val);
  }

  if (!height.IsPercentage()) {
    nscoord val = nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content));
    if (val < 0) val = 0;
    intrinsicSize.height.SetCoordValue(val);
  }

  return intrinsicSize;
}

/* virtual */ nsSize
nsSVGOuterSVGFrame::GetIntrinsicRatio()
{
  // We only have an intrinsic size/ratio if our width and height attributes
  // are both specified and set to non-percentage values, or we have a viewBox
  // rect: http://www.w3.org/TR/SVGMobile12/coords.html#IntrinsicSizing

  SVGSVGElement *content = static_cast<SVGSVGElement*>(mContent);
  nsSVGLength2 &width  = content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
  nsSVGLength2 &height = content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];

  if (!width.IsPercentage() && !height.IsPercentage()) {
    nsSize ratio(
      nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content)),
      nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content)));
    if (ratio.width < 0) {
      ratio.width = 0;
    }
    if (ratio.height < 0) {
      ratio.height = 0;
    }
    return ratio;
  }

  SVGViewElement* viewElement = content->GetCurrentViewElement();
  const nsSVGViewBoxRect* viewbox = nullptr;

  // The logic here should match HasViewBox().
  if (viewElement && viewElement->mViewBox.HasRect()) {
    viewbox = &viewElement->mViewBox.GetAnimValue();
  } else if (content->mViewBox.HasRect()) {
    viewbox = &content->mViewBox.GetAnimValue();
  }

  if (viewbox) {
    float viewBoxWidth = viewbox->width;
    float viewBoxHeight = viewbox->height;

    if (viewBoxWidth < 0.0f) {
      viewBoxWidth = 0.0f;
    }
    if (viewBoxHeight < 0.0f) {
      viewBoxHeight = 0.0f;
    }
    return nsSize(nsPresContext::CSSPixelsToAppUnits(viewBoxWidth),
                  nsPresContext::CSSPixelsToAppUnits(viewBoxHeight));
  }

  return nsSVGDisplayContainerFrame::GetIntrinsicRatio();
}

/* virtual */
LogicalSize
nsSVGOuterSVGFrame::ComputeSize(nsRenderingContext *aRenderingContext,
                                WritingMode aWM,
                                const LogicalSize& aCBSize,
                                nscoord aAvailableISize,
                                const LogicalSize& aMargin,
                                const LogicalSize& aBorder,
                                const LogicalSize& aPadding,
                                ComputeSizeFlags aFlags)
{
  if (IsRootOfImage() || IsRootOfReplacedElementSubDoc()) {
    // The embedding element has sized itself using the CSS replaced element
    // sizing rules, using our intrinsic dimensions as necessary. The SVG spec
    // says that the width and height of embedded SVG is overridden by the
    // width and height of the embedding element, so we just need to size to
    // the viewport that the embedding element has established for us.
    return aCBSize;
  }

  LogicalSize cbSize = aCBSize;
  IntrinsicSize intrinsicSize = GetIntrinsicSize();

  if (!mContent->GetParent()) {
    // We're the root of the outermost browsing context, so we need to scale
    // cbSize by the full-zoom so that SVGs with percentage width/height zoom:

    NS_ASSERTION(aCBSize.ISize(aWM) != NS_AUTOHEIGHT &&
                 aCBSize.BSize(aWM) != NS_AUTOHEIGHT,
                 "root should not have auto-width/height containing block");
    cbSize.ISize(aWM) *= PresContext()->GetFullZoom();
    cbSize.BSize(aWM) *= PresContext()->GetFullZoom();

    // We also need to honour the width and height attributes' default values
    // of 100% when we're the root of a browsing context.  (GetIntrinsicSize()
    // doesn't report these since there's no such thing as a percentage
    // intrinsic size.  Also note that explicit percentage values are mapped
    // into style, so the following isn't for them.)

    SVGSVGElement* content = static_cast<SVGSVGElement*>(mContent);

    nsSVGLength2 &width =
      content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
    if (width.IsPercentage()) {
      MOZ_ASSERT(intrinsicSize.width.GetUnit() == eStyleUnit_None,
                 "GetIntrinsicSize should have reported no intrinsic width");
      float val = width.GetAnimValInSpecifiedUnits() / 100.0f;
      if (val < 0.0f) val = 0.0f;
      intrinsicSize.width.SetCoordValue(val * cbSize.Width(aWM));
    }

    nsSVGLength2 &height =
      content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
    NS_ASSERTION(aCBSize.BSize(aWM) != NS_AUTOHEIGHT,
                 "root should not have auto-height containing block");
    if (height.IsPercentage()) {
      MOZ_ASSERT(intrinsicSize.height.GetUnit() == eStyleUnit_None,
                 "GetIntrinsicSize should have reported no intrinsic height");
      float val = height.GetAnimValInSpecifiedUnits() / 100.0f;
      if (val < 0.0f) val = 0.0f;
      intrinsicSize.height.SetCoordValue(val * cbSize.Height(aWM));
    }
    MOZ_ASSERT(intrinsicSize.height.GetUnit() == eStyleUnit_Coord &&
               intrinsicSize.width.GetUnit() == eStyleUnit_Coord,
               "We should have just handled the only situation where"
               "we lack an intrinsic height or width.");
  }

  return ComputeSizeWithIntrinsicDimensions(aRenderingContext, aWM,
                                            intrinsicSize, GetIntrinsicRatio(),
                                            cbSize, aMargin, aBorder, aPadding,
                                            aFlags);
}

void
nsSVGOuterSVGFrame::Reflow(nsPresContext*           aPresContext,
                           ReflowOutput&     aDesiredSize,
                           const ReflowInput& aReflowInput,
                           nsReflowStatus&          aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsSVGOuterSVGFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                  ("enter nsSVGOuterSVGFrame::Reflow: availSize=%d,%d",
                  aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));

  NS_PRECONDITION(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");

  aStatus = NS_FRAME_COMPLETE;

  aDesiredSize.Width()  = aReflowInput.ComputedWidth() +
                          aReflowInput.ComputedPhysicalBorderPadding().LeftRight();
  aDesiredSize.Height() = aReflowInput.ComputedHeight() +
                          aReflowInput.ComputedPhysicalBorderPadding().TopBottom();

  NS_ASSERTION(!GetPrevInFlow(), "SVG can't currently be broken across pages.");

  SVGSVGElement *svgElem = static_cast<SVGSVGElement*>(mContent);

  nsSVGOuterSVGAnonChildFrame *anonKid =
    static_cast<nsSVGOuterSVGAnonChildFrame*>(PrincipalChildList().FirstChild());

  if (mState & NS_FRAME_FIRST_REFLOW) {
    // Initialize
    svgElem->UpdateHasChildrenOnlyTransform();
  }

  // If our SVG viewport has changed, update our content and notify.
  // http://www.w3.org/TR/SVG11/coords.html#ViewportSpace

  svgFloatSize newViewportSize(
    nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedWidth()),
    nsPresContext::AppUnitsToFloatCSSPixels(aReflowInput.ComputedHeight()));

  svgFloatSize oldViewportSize = svgElem->GetViewportSize();

  uint32_t changeBits = 0;
  if (newViewportSize != oldViewportSize) {
    // When our viewport size changes, we may need to update the overflow rects
    // of our child frames. This is the case if:
    //
    //  * We have a real/synthetic viewBox (a children-only transform), since
    //    the viewBox transform will change as the viewport dimensions change.
    //
    //  * We do not have a real/synthetic viewBox, but the last time we
    //    reflowed (or the last time UpdateOverflow() was called) we did.
    //
    // We only handle the former case here, in which case we mark all our child
    // frames as dirty so that we reflow them below and update their overflow
    // rects.
    //
    // In the latter case, updating of overflow rects is handled for removal of
    // real viewBox (the viewBox attribute) in AttributeChanged. Synthetic
    // viewBox "removal" (e.g. a document references the same SVG via both an
    // <svg:image> and then as a CSS background image (a synthetic viewBox is
    // used when painting the former, but not when painting the latter)) is
    // handled in SVGSVGElement::FlushImageTransformInvalidation.
    //
    if (svgElem->HasViewBoxOrSyntheticViewBox()) {
      nsIFrame* anonChild = PrincipalChildList().FirstChild();
      anonChild->AddStateBits(NS_FRAME_IS_DIRTY);
      for (nsIFrame* child : anonChild->PrincipalChildList()) {
        child->AddStateBits(NS_FRAME_IS_DIRTY);
      }
    }
    changeBits |= COORD_CONTEXT_CHANGED;
    svgElem->SetViewportSize(newViewportSize);
  }
  if (mFullZoom != PresContext()->GetFullZoom()) {
    changeBits |= FULL_ZOOM_CHANGED;
    mFullZoom = PresContext()->GetFullZoom();
  }
  if (changeBits) {
    NotifyViewportOrTransformChanged(changeBits);
  }
  mViewportInitialized = true;

  // Now that we've marked the necessary children as dirty, call
  // ReflowSVG() or ReflowSVGNonDisplayText() on them, depending
  // on whether we are non-display.
  mCallingReflowSVG = true;
  if (GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
    ReflowSVGNonDisplayText(this);
  } else {
    // Update the mRects and visual overflow rects of all our descendants,
    // including our anonymous wrapper kid:
    anonKid->AddStateBits(mState & NS_FRAME_IS_DIRTY);
    anonKid->ReflowSVG();
    MOZ_ASSERT(!anonKid->GetNextSibling(),
               "We should have one anonymous child frame wrapping our real "
               "children");
  }
  mCallingReflowSVG = false;

  // Set our anonymous kid's offset from our border box:
  anonKid->SetPosition(GetContentRectRelativeToSelf().TopLeft());

  // Including our size in our overflow rects regardless of the value of
  // 'background', 'border', etc. makes sure that we usually (when we clip to
  // our content area) don't have to keep changing our overflow rects as our
  // descendants move about (see perf comment below). Including our size in our
  // scrollable overflow rect also makes sure that we scroll if we're too big
  // for our viewport.
  //
  // <svg> never allows scrolling to anything outside its mRect (only panning),
  // so we must always keep our scrollable overflow set to our size.
  //
  // With regards to visual overflow, we always clip root-<svg> (see our
  // BuildDisplayList method) regardless of the value of the 'overflow'
  // property since that is per-spec, even for the initial 'visible' value. For
  // that reason there's no point in adding descendant visual overflow to our
  // own when this frame is for a root-<svg>. That said, there's also a very
  // good performance reason for us wanting to avoid doing so. If we did, then
  // the frame's overflow would often change as descendants that are partially
  // or fully outside its rect moved (think animation on/off screen), and that
  // would cause us to do a full NS_FRAME_IS_DIRTY reflow and repaint of the
  // entire document tree each such move (see bug 875175).
  //
  // So it's only non-root outer-<svg> that has the visual overflow of its
  // descendants added to its own. (Note that the default user-agent style
  // sheet makes 'hidden' the default value for :not(root(svg)), so usually
  // FinishAndStoreOverflow will still clip this back to the frame's rect.)
  //
  // WARNING!! Keep UpdateBounds below in sync with whatever we do for our
  // overflow rects here! (Again, see bug 875175.)
  //
  aDesiredSize.SetOverflowAreasToDesiredBounds();
  if (!mIsRootContent) {
    aDesiredSize.mOverflowAreas.VisualOverflow().UnionRect(
      aDesiredSize.mOverflowAreas.VisualOverflow(),
      anonKid->GetVisualOverflowRect() + anonKid->GetPosition());
  }
  FinishAndStoreOverflow(&aDesiredSize);

  NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS,
                  ("exit nsSVGOuterSVGFrame::Reflow: size=%d,%d",
                  aDesiredSize.Width(), aDesiredSize.Height()));
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}

void
nsSVGOuterSVGFrame::DidReflow(nsPresContext*   aPresContext,
                              const ReflowInput*  aReflowInput,
                              nsDidReflowStatus aStatus)
{
  nsSVGDisplayContainerFrame::DidReflow(aPresContext,aReflowInput,aStatus);

  // Make sure elements styled by :hover get updated if script/animation moves
  // them under or out from under the pointer:
  PresContext()->PresShell()->SynthesizeMouseMove(false);
}

/* virtual */ void
nsSVGOuterSVGFrame::UnionChildOverflow(nsOverflowAreas& aOverflowAreas)
{
  // See the comments in Reflow above.

  // WARNING!! Keep this in sync with Reflow above!

  if (!mIsRootContent) {
    nsIFrame *anonKid = PrincipalChildList().FirstChild();
    aOverflowAreas.VisualOverflow().UnionRect(
      aOverflowAreas.VisualOverflow(),
      anonKid->GetVisualOverflowRect() + anonKid->GetPosition());
  }
}


//----------------------------------------------------------------------
// container methods

/**
 * Used to paint/hit-test SVG when SVG display lists are disabled.
 */
class nsDisplayOuterSVG : public nsDisplayItem {
public:
  nsDisplayOuterSVG(nsDisplayListBuilder* aBuilder,
                    nsSVGOuterSVGFrame* aFrame) :
    nsDisplayItem(aBuilder, aFrame) {
    MOZ_COUNT_CTOR(nsDisplayOuterSVG);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayOuterSVG() {
    MOZ_COUNT_DTOR(nsDisplayOuterSVG);
  }
#endif

  virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                       HitTestState* aState,
                       nsTArray<nsIFrame*> *aOutFrames) override;
  virtual void Paint(nsDisplayListBuilder* aBuilder,
                     nsRenderingContext* aCtx) override;

  virtual void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
                                         const nsDisplayItemGeometry* aGeometry,
                                         nsRegion* aInvalidRegion) override;

  nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
  {
    return new nsDisplayItemGenericImageGeometry(this, aBuilder);
  }

  NS_DISPLAY_DECL_NAME("SVGOuterSVG", TYPE_SVG_OUTER_SVG)
};

void
nsDisplayOuterSVG::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                           HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
  nsSVGOuterSVGFrame *outerSVGFrame = static_cast<nsSVGOuterSVGFrame*>(mFrame);

  nsPoint refFrameToContentBox =
    ToReferenceFrame() + outerSVGFrame->GetContentRectRelativeToSelf().TopLeft();

  nsPoint pointRelativeToContentBox =
    nsPoint(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2) -
      refFrameToContentBox;

  gfxPoint svgViewportRelativePoint =
    gfxPoint(pointRelativeToContentBox.x, pointRelativeToContentBox.y) /
      outerSVGFrame->PresContext()->AppUnitsPerCSSPixel();

  nsSVGOuterSVGAnonChildFrame *anonKid =
    static_cast<nsSVGOuterSVGAnonChildFrame*>(
      outerSVGFrame->PrincipalChildList().FirstChild());

  nsIFrame* frame =
    nsSVGUtils::HitTestChildren(anonKid, svgViewportRelativePoint);
  if (frame) {
    aOutFrames->AppendElement(frame);
  }
}

void
nsDisplayOuterSVG::Paint(nsDisplayListBuilder* aBuilder,
                         nsRenderingContext* aContext)
{
#if defined(DEBUG) && defined(SVG_DEBUG_PAINT_TIMING)
  PRTime start = PR_Now();
#endif

  // Create an SVGAutoRenderState so we can call SetPaintingToWindow on it.
  SVGAutoRenderState state(aContext->GetDrawTarget());

  if (aBuilder->IsPaintingToWindow()) {
    state.SetPaintingToWindow(true);
  }

  nsRect viewportRect =
    mFrame->GetContentRectRelativeToSelf() + ToReferenceFrame();

  nsRect clipRect = mVisibleRect.Intersect(viewportRect);

  uint32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();

  nsIntRect contentAreaDirtyRect =
    (clipRect - viewportRect.TopLeft()).
      ToOutsidePixels(appUnitsPerDevPixel);

  gfxPoint devPixelOffset =
    nsLayoutUtils::PointToGfxPoint(viewportRect.TopLeft(), appUnitsPerDevPixel);

  aContext->ThebesContext()->Save();
  // We include the offset of our frame and a scale from device pixels to user
  // units (i.e. CSS px) in the matrix that we pass to our children):
  gfxMatrix tm = nsSVGIntegrationUtils::GetCSSPxToDevPxMatrix(mFrame) *
                   gfxMatrix::Translation(devPixelOffset);
  DrawResult result =
    nsSVGUtils::PaintFrameWithEffects(mFrame, *aContext->ThebesContext(), tm,
                                      &contentAreaDirtyRect);
  nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
  aContext->ThebesContext()->Restore();

#if defined(DEBUG) && defined(SVG_DEBUG_PAINT_TIMING)
  PRTime end = PR_Now();
  printf("SVG Paint Timing: %f ms\n", (end-start)/1000.0);
#endif
}

nsRegion
nsSVGOuterSVGFrame::FindInvalidatedForeignObjectFrameChildren(nsIFrame* aFrame)
{
  nsRegion result;
  if (mForeignObjectHash && mForeignObjectHash->Count()) {
    for (auto it = mForeignObjectHash->Iter(); !it.Done(); it.Next()) {
      result.Or(result, it.Get()->GetKey()->GetInvalidRegion());
    }
  }
  return result;
}

void
nsDisplayOuterSVG::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
                                             const nsDisplayItemGeometry* aGeometry,
                                             nsRegion* aInvalidRegion)
{
  nsSVGOuterSVGFrame *frame = static_cast<nsSVGOuterSVGFrame*>(mFrame);
  frame->InvalidateSVG(frame->FindInvalidatedForeignObjectFrameChildren(frame));

  nsRegion result = frame->GetInvalidRegion();
  result.MoveBy(ToReferenceFrame());
  frame->ClearInvalidRegion();

  nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
  aInvalidRegion->Or(*aInvalidRegion, result);

  auto geometry =
    static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);

  if (aBuilder->ShouldSyncDecodeImages() &&
    geometry->ShouldInvalidateToSyncDecodeImages()) {
    bool snap;
    aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
  }
}

nsresult
nsSVGOuterSVGFrame::AttributeChanged(int32_t  aNameSpaceID,
                                     nsIAtom* aAttribute,
                                     int32_t  aModType)
{
  if (aNameSpaceID == kNameSpaceID_None &&
      !(GetStateBits() & (NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_NONDISPLAY))) {
    if (aAttribute == nsGkAtoms::viewBox ||
        aAttribute == nsGkAtoms::preserveAspectRatio ||
        aAttribute == nsGkAtoms::transform) {

      // make sure our cached transform matrix gets (lazily) updated
      mCanvasTM = nullptr;

      nsSVGUtils::NotifyChildrenOfSVGChange(PrincipalChildList().FirstChild(),
                aAttribute == nsGkAtoms::viewBox ?
                  TRANSFORM_CHANGED | COORD_CONTEXT_CHANGED : TRANSFORM_CHANGED);

      if (aAttribute != nsGkAtoms::transform) {
        static_cast<SVGSVGElement*>(mContent)->ChildrenOnlyTransformChanged();
      }

    } else if (aAttribute == nsGkAtoms::width ||
               aAttribute == nsGkAtoms::height) {

      // Don't call ChildrenOnlyTransformChanged() here, since we call it
      // under Reflow if the width/height actually changed.

      nsIFrame* embeddingFrame;
      if (IsRootOfReplacedElementSubDoc(&embeddingFrame) && embeddingFrame) {
        if (DependsOnIntrinsicSize(embeddingFrame)) {
          // Tell embeddingFrame's presShell it needs to be reflowed (which takes
          // care of reflowing us too).
          embeddingFrame->PresContext()->PresShell()->
            FrameNeedsReflow(embeddingFrame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
        }
        // else our width and height is overridden - don't reflow anything
      } else {
        // We are not embedded by reference, so our 'width' and 'height'
        // attributes are not overridden - we need to reflow.
        PresContext()->PresShell()->
          FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
      }
    }
  }

  return NS_OK;
}

//----------------------------------------------------------------------
// painting

void
nsSVGOuterSVGFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                     const nsDisplayListSet& aLists)
{
  if (GetStateBits() & NS_FRAME_IS_NONDISPLAY) {
    return;
  }

  DisplayBorderBackgroundOutline(aBuilder, aLists);

  // Per-spec, we always clip root-<svg> even when 'overflow' has its initial
  // value of 'visible'. See also the "visual overflow" comments in Reflow.
  DisplayListClipState::AutoSaveRestore autoSR(aBuilder);
  if (mIsRootContent ||
      StyleDisplay()->IsScrollableOverflow()) {
    autoSR.ClipContainingBlockDescendantsToContentBox(aBuilder, this);
  }

  if ((aBuilder->IsForEventDelivery() &&
       NS_SVGDisplayListHitTestingEnabled()) ||
      (!aBuilder->IsForEventDelivery() &&
       NS_SVGDisplayListPaintingEnabled())) {
    nsDisplayList *contentList = aLists.Content();
    nsDisplayListSet set(contentList, contentList, contentList,
                         contentList, contentList, contentList);
    BuildDisplayListForNonBlockChildren(aBuilder, set);
  } else if (IsVisibleForPainting(aBuilder) || !aBuilder->IsForPainting()) {
    aLists.Content()->AppendNewToTop(
      new (aBuilder) nsDisplayOuterSVG(aBuilder, this));
  }
}

nsSplittableType
nsSVGOuterSVGFrame::GetSplittableType() const
{
  return NS_FRAME_NOT_SPLITTABLE;
}

nsIAtom *
nsSVGOuterSVGFrame::GetType() const
{
  return nsGkAtoms::svgOuterSVGFrame;
}

//----------------------------------------------------------------------
// nsISVGSVGFrame methods:

void
nsSVGOuterSVGFrame::NotifyViewportOrTransformChanged(uint32_t aFlags)
{
  MOZ_ASSERT(aFlags &&
             !(aFlags & ~(COORD_CONTEXT_CHANGED | TRANSFORM_CHANGED |
                          FULL_ZOOM_CHANGED)),
             "Unexpected aFlags value");

  // No point in doing anything when were not init'ed yet:
  if (!mViewportInitialized) {
    return;
  }

  SVGSVGElement *content = static_cast<SVGSVGElement*>(mContent);

  if (aFlags & COORD_CONTEXT_CHANGED) {
    if (content->HasViewBoxRect()) {
      // Percentage lengths on children resolve against the viewBox rect so we
      // don't need to notify them of the viewport change, but the viewBox
      // transform will have changed, so we need to notify them of that instead.
      aFlags = TRANSFORM_CHANGED;
    }
    else if (content->ShouldSynthesizeViewBox()) {
      // In the case of a synthesized viewBox, the synthetic viewBox's rect
      // changes as the viewport changes. As a result we need to maintain the
      // COORD_CONTEXT_CHANGED flag.
      aFlags |= TRANSFORM_CHANGED;
    }
    else if (mCanvasTM && mCanvasTM->IsSingular()) {
      // A width/height of zero will result in us having a singular mCanvasTM
      // even when we don't have a viewBox. So we also want to recompute our
      // mCanvasTM for this width/height change even though we don't have a
      // viewBox.
      aFlags |= TRANSFORM_CHANGED;
    }
  }

  bool haveNonFulLZoomTransformChange = (aFlags & TRANSFORM_CHANGED);

  if (aFlags & FULL_ZOOM_CHANGED) {
    // Convert FULL_ZOOM_CHANGED to TRANSFORM_CHANGED:
    aFlags = (aFlags & ~FULL_ZOOM_CHANGED) | TRANSFORM_CHANGED;
  }

  if (aFlags & TRANSFORM_CHANGED) {
    // Make sure our canvas transform matrix gets (lazily) recalculated:
    mCanvasTM = nullptr;

    if (haveNonFulLZoomTransformChange &&
        !(mState & NS_FRAME_IS_NONDISPLAY)) {
      uint32_t flags = (mState & NS_FRAME_IN_REFLOW) ?
                         SVGSVGElement::eDuringReflow : 0;
      content->ChildrenOnlyTransformChanged(flags);
    }
  }

  nsSVGUtils::NotifyChildrenOfSVGChange(PrincipalChildList().FirstChild(), aFlags);
}

//----------------------------------------------------------------------
// nsISVGChildFrame methods:

DrawResult
nsSVGOuterSVGFrame::PaintSVG(gfxContext& aContext,
                             const gfxMatrix& aTransform,
                             const nsIntRect* aDirtyRect)
{
  NS_ASSERTION(PrincipalChildList().FirstChild()->GetType() ==
                 nsGkAtoms::svgOuterSVGAnonChildFrame &&
               !PrincipalChildList().FirstChild()->GetNextSibling(),
               "We should have a single, anonymous, child");
  nsSVGOuterSVGAnonChildFrame *anonKid =
    static_cast<nsSVGOuterSVGAnonChildFrame*>(PrincipalChildList().FirstChild());
  return anonKid->PaintSVG(aContext, aTransform, aDirtyRect);
}

SVGBBox
nsSVGOuterSVGFrame::GetBBoxContribution(const gfx::Matrix &aToBBoxUserspace,
                                        uint32_t aFlags)
{
  NS_ASSERTION(PrincipalChildList().FirstChild()->GetType() ==
                 nsGkAtoms::svgOuterSVGAnonChildFrame &&
               !PrincipalChildList().FirstChild()->GetNextSibling(),
               "We should have a single, anonymous, child");
  // We must defer to our child so that we don't include our
  // content->PrependLocalTransformsTo() transforms.
  nsSVGOuterSVGAnonChildFrame *anonKid =
    static_cast<nsSVGOuterSVGAnonChildFrame*>(PrincipalChildList().FirstChild());
  return anonKid->GetBBoxContribution(aToBBoxUserspace, aFlags);
}

//----------------------------------------------------------------------
// nsSVGContainerFrame methods:

gfxMatrix
nsSVGOuterSVGFrame::GetCanvasTM()
{
  if (!mCanvasTM) {
    SVGSVGElement *content = static_cast<SVGSVGElement*>(mContent);

    float devPxPerCSSPx =
      1.0f / PresContext()->AppUnitsToFloatCSSPixels(
                                PresContext()->AppUnitsPerDevPixel());

    gfxMatrix tm = content->PrependLocalTransformsTo(
                     gfxMatrix::Scaling(devPxPerCSSPx, devPxPerCSSPx));
    mCanvasTM = new gfxMatrix(tm);
  }
  return *mCanvasTM;
}

//----------------------------------------------------------------------
// Implementation helpers

bool
nsSVGOuterSVGFrame::IsRootOfReplacedElementSubDoc(nsIFrame **aEmbeddingFrame)
{
  if (!mContent->GetParent()) {
    // Our content is the document element
    nsCOMPtr<nsIDocShell> docShell = PresContext()->GetDocShell();
    nsCOMPtr<nsPIDOMWindowOuter> window;
    if (docShell) {
      window = docShell->GetWindow();
    }

    if (window) {
      nsCOMPtr<nsIDOMElement> frameElement = window->GetFrameElement();
      nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(frameElement);
      nsCOMPtr<nsIDOMHTMLIFrameElement> iframeElement =
        do_QueryInterface(frameElement);
      if (olc || iframeElement) {
        // Our document is inside an HTML 'object', 'embed', 'applet'
        // or 'iframe' element
        if (aEmbeddingFrame) {
          nsCOMPtr<nsIContent> element = do_QueryInterface(frameElement);
          *aEmbeddingFrame = element->GetPrimaryFrame();
          NS_ASSERTION(*aEmbeddingFrame, "Yikes, no embedding frame!");
        }
        return true;
      }
    }
  }
  if (aEmbeddingFrame) {
    *aEmbeddingFrame = nullptr;
  }
  return false;
}

bool
nsSVGOuterSVGFrame::IsRootOfImage()
{
  if (!mContent->GetParent()) {
    // Our content is the document element
    nsIDocument* doc = mContent->GetUncomposedDoc();
    if (doc && doc->IsBeingUsedAsImage()) {
      // Our document is being used as an image
      return true;
    }
  }

  return false;
}

bool
nsSVGOuterSVGFrame::VerticalScrollbarNotNeeded() const
{
  nsSVGLength2 &height = static_cast<SVGSVGElement*>(mContent)->
                           mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
  return height.IsPercentage() && height.GetBaseValInSpecifiedUnits() <= 100;
}


//----------------------------------------------------------------------
// Implementation of nsSVGOuterSVGAnonChildFrame

nsContainerFrame*
NS_NewSVGOuterSVGAnonChildFrame(nsIPresShell* aPresShell,
                                nsStyleContext* aContext)
{
  return new (aPresShell) nsSVGOuterSVGAnonChildFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsSVGOuterSVGAnonChildFrame)

#ifdef DEBUG
void
nsSVGOuterSVGAnonChildFrame::Init(nsIContent*       aContent,
                                  nsContainerFrame* aParent,
                                  nsIFrame*         aPrevInFlow)
{
  MOZ_ASSERT(aParent->GetType() == nsGkAtoms::svgOuterSVGFrame,
             "Unexpected parent");
  nsSVGDisplayContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
#endif

nsIAtom *
nsSVGOuterSVGAnonChildFrame::GetType() const
{
  return nsGkAtoms::svgOuterSVGAnonChildFrame;
}

static Matrix
ComputeOuterSVGAnonChildFrameTransform(const nsSVGOuterSVGAnonChildFrame* aFrame)
{
  // Our elements 'transform' attribute is applied to our nsSVGOuterSVGFrame
  // parent, and the element's children-only transforms are applied to us, the
  // anonymous child frame. Since we are the child frame, we apply the
  // children-only transforms as if they are our own transform.

  SVGSVGElement* content = static_cast<SVGSVGElement*>(aFrame->GetContent());

  if (!content->HasChildrenOnlyTransform()) {
    return Matrix();
  }

  // Outer-<svg> doesn't use x/y, so we can pass eChildToUserSpace here.
  gfxMatrix ownMatrix =
    content->PrependLocalTransformsTo(gfxMatrix(), eChildToUserSpace);

  if (ownMatrix.HasNonTranslation()) {
    // viewBox, currentScale and currentTranslate should only produce a
    // rectilinear transform.
    MOZ_ASSERT(ownMatrix.IsRectilinear(),
                "Non-rectilinear transform will break the following logic");

    // The nsDisplayTransform code will apply this transform to our frame,
    // including to our frame position.  We don't want our frame position to
    // be scaled though, so we need to correct for that in the transform.
    CSSPoint pos = CSSPixel::FromAppUnits(aFrame->GetPosition());
    CSSPoint scaledPos = CSSPoint(ownMatrix._11 * pos.x, ownMatrix._22 * pos.y);
    CSSPoint deltaPos = scaledPos - pos;
    ownMatrix *= gfxMatrix::Translation(-deltaPos.x, -deltaPos.y);
  }

  return gfx::ToMatrix(ownMatrix);
}

// We want this frame to be a reference frame. An easy way to achieve that is
// to always return true from this method, even for identity transforms.
// This frame being a reference frame ensures that the offset between this
// <svg> element and the parent reference frame is completely absorbed by the
// nsDisplayTransform that's created for this frame, and that this offset does
// not affect our descendants' transforms. Consequently, if the <svg> element
// moves, e.g. during scrolling, the transform matrices of our contents are
// unaffected. This simplifies invalidation.
bool
nsSVGOuterSVGAnonChildFrame::IsSVGTransformed(Matrix* aOwnTransform,
                                              Matrix* aFromParentTransform) const
{
  if (aOwnTransform) {
    *aOwnTransform = ComputeOuterSVGAnonChildFrameTransform(this);
  }

  return true;
}