summaryrefslogtreecommitdiffstats
path: root/gfx/layers/composite/ContainerLayerComposite.cpp
blob: f25503532c0a9c07a94c22d8a78ce4fd234a0d32 (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
/* -*- Mode: C++; tab-width: 20; 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/. */

#include "ContainerLayerComposite.h"
#include <algorithm>                    // for min
#include "apz/src/AsyncPanZoomController.h"  // for AsyncPanZoomController
#include "FrameMetrics.h"               // for FrameMetrics
#include "Units.h"                      // for LayerRect, LayerPixel, etc
#include "CompositableHost.h"           // for CompositableHost
#include "gfxEnv.h"                     // for gfxEnv
#include "gfxPrefs.h"                   // for gfxPrefs
#include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
#include "mozilla/RefPtr.h"             // for RefPtr
#include "mozilla/UniquePtr.h"          // for UniquePtr
#include "mozilla/gfx/BaseRect.h"       // for BaseRect
#include "mozilla/gfx/Matrix.h"         // for Matrix4x4
#include "mozilla/gfx/Point.h"          // for Point, IntPoint
#include "mozilla/gfx/Rect.h"           // for IntRect, Rect
#include "mozilla/layers/Compositor.h"  // for Compositor, etc
#include "mozilla/layers/CompositorTypes.h"  // for DiagnosticFlags::CONTAINER
#include "mozilla/layers/Effects.h"     // for Effect, EffectChain, etc
#include "mozilla/layers/TextureHost.h"  // for CompositingRenderTarget
#include "mozilla/layers/AsyncCompositionManager.h" // for ViewTransform
#include "mozilla/layers/LayerMetricsWrapper.h" // for LayerMetricsWrapper
#include "mozilla/mozalloc.h"           // for operator delete, etc
#include "mozilla/RefPtr.h"                   // for nsRefPtr
#include "nsDebug.h"                    // for NS_ASSERTION
#include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
#include "nsISupportsUtils.h"           // for NS_ADDREF, NS_RELEASE
#include "nsRegion.h"                   // for nsIntRegion
#include "nsTArray.h"                   // for AutoTArray
#include <stack>
#include "TextRenderer.h"               // for TextRenderer
#include <vector>
#include "GeckoProfiler.h"              // for GeckoProfiler

#define CULLING_LOG(...)
// #define CULLING_LOG(...) printf_stderr("CULLING: " __VA_ARGS__)

#define DUMP(...) do { if (gfxEnv::DumpDebug()) { printf_stderr(__VA_ARGS__); } } while(0)
#define XYWH(k)  (k).x, (k).y, (k).width, (k).height
#define XY(k)    (k).x, (k).y
#define WH(k)    (k).width, (k).height

namespace mozilla {
namespace layers {

using namespace gfx;

static void DrawLayerInfo(const RenderTargetIntRect& aClipRect,
                          LayerManagerComposite* aManager,
                          Layer* aLayer)
{

  if (aLayer->GetType() == Layer::LayerType::TYPE_CONTAINER) {
    // XXX - should figure out a way to render this, but for now this
    // is hard to do, since it will often get superimposed over the first
    // child of the layer, which is bad.
    return;
  }

  std::stringstream ss;
  aLayer->PrintInfo(ss, "");

  LayerIntRegion visibleRegion = aLayer->GetVisibleRegion();

  uint32_t maxWidth = std::min<uint32_t>(visibleRegion.GetBounds().width, 500);

  IntPoint topLeft = visibleRegion.ToUnknownRegion().GetBounds().TopLeft();
  aManager->GetTextRenderer()->RenderText(ss.str().c_str(), topLeft,
                                          aLayer->GetEffectiveTransform(), 16,
                                          maxWidth);
}

template<class ContainerT>
static gfx::IntRect ContainerVisibleRect(ContainerT* aContainer)
{
  gfx::IntRect surfaceRect = aContainer->GetLocalVisibleRegion().ToUnknownRegion().GetBounds();
  return surfaceRect;
}

static void PrintUniformityInfo(Layer* aLayer)
{
  /*** STUB ***/
}

/* all of the per-layer prepared data we need to maintain */
struct PreparedLayer
{
  PreparedLayer(Layer *aLayer, RenderTargetIntRect aClipRect) :
    mLayer(aLayer), mClipRect(aClipRect) {}
  RefPtr<Layer> mLayer;
  RenderTargetIntRect mClipRect;
};

/* all of the prepared data that we need in RenderLayer() */
struct PreparedData
{
  RefPtr<CompositingRenderTarget> mTmpTarget;
  AutoTArray<PreparedLayer, 12> mLayers;
  bool mNeedsSurfaceCopy;
};

// ContainerPrepare is shared between RefLayer and ContainerLayer
template<class ContainerT> void
ContainerPrepare(ContainerT* aContainer,
                 LayerManagerComposite* aManager,
                 const RenderTargetIntRect& aClipRect)
{
  aContainer->mPrepared = MakeUnique<PreparedData>();
  aContainer->mPrepared->mNeedsSurfaceCopy = false;

  /**
   * Determine which layers to draw.
   */
  AutoTArray<Layer*, 12> children;
  aContainer->SortChildrenBy3DZOrder(children);

  for (uint32_t i = 0; i < children.Length(); i++) {
    LayerComposite* layerToRender = static_cast<LayerComposite*>(children.ElementAt(i)->ImplData());

    RenderTargetIntRect clipRect = layerToRender->GetLayer()->
        CalculateScissorRect(aClipRect);

    if (layerToRender->GetLayer()->IsBackfaceHidden()) {
      continue;
    }

    // We don't want to skip container layers because otherwise their mPrepared
    // may be null which is not allowed.
    if (!layerToRender->GetLayer()->AsContainerLayer()) {
      if (!layerToRender->GetLayer()->IsVisible() &&
          !layerToRender->NeedToDrawCheckerboarding(nullptr)) {
        CULLING_LOG("Sublayer %p has no effective visible region\n", layerToRender->GetLayer());
        continue;
      }

      if (clipRect.IsEmpty()) {
        CULLING_LOG("Sublayer %p has an empty world clip rect\n", layerToRender->GetLayer());
        continue;
      }
    }

    CULLING_LOG("Preparing sublayer %p\n", layerToRender->GetLayer());

    layerToRender->Prepare(clipRect);
    aContainer->mPrepared->mLayers.AppendElement(PreparedLayer(layerToRender->GetLayer(),
                                                               clipRect));
  }

  CULLING_LOG("Preparing container layer %p\n", aContainer->GetLayer());

  /**
   * Setup our temporary surface for rendering the contents of this container.
   */

  gfx::IntRect surfaceRect = ContainerVisibleRect(aContainer);
  if (surfaceRect.IsEmpty()) {
    return;
  }

  bool surfaceCopyNeeded;
  // DefaultComputeSupportsComponentAlphaChildren can mutate aContainer so call it unconditionally
  aContainer->DefaultComputeSupportsComponentAlphaChildren(&surfaceCopyNeeded);
  if (aContainer->UseIntermediateSurface()) {
    if (!surfaceCopyNeeded) {
      RefPtr<CompositingRenderTarget> surface = nullptr;

      RefPtr<CompositingRenderTarget>& lastSurf = aContainer->mLastIntermediateSurface;
      if (lastSurf && !aContainer->mChildrenChanged && lastSurf->GetRect().IsEqualEdges(surfaceRect)) {
        surface = lastSurf;
      }

      if (!surface) {
        // If we don't need a copy we can render to the intermediate now to avoid
        // unecessary render target switching. This brings a big perf boost on mobile gpus.
        surface = CreateOrRecycleTarget(aContainer, aManager);

        MOZ_PERFORMANCE_WARNING("gfx", "[%p] Container layer requires intermediate surface rendering\n", aContainer);
        RenderIntermediate(aContainer, aManager, aClipRect.ToUnknownRect(), surface);
        aContainer->SetChildrenChanged(false);
      }

      aContainer->mPrepared->mTmpTarget = surface;
    } else {
      MOZ_PERFORMANCE_WARNING("gfx", "[%p] Container layer requires intermediate surface copy\n", aContainer);
      aContainer->mPrepared->mNeedsSurfaceCopy = true;
      aContainer->mLastIntermediateSurface = nullptr;
    }
  } else {
    aContainer->mLastIntermediateSurface = nullptr;
  }
}

template<class ContainerT> void
RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
                   const RenderTargetIntRect& aClipRect, Layer* aLayer)
{
  Compositor* compositor = aManager->GetCompositor();

  if (aLayer->GetScrollMetadataCount() < 1) {
    return;
  }

  AsyncPanZoomController* controller = aLayer->GetAsyncPanZoomController(0);
  if (!controller) {
    return;
  }

  ParentLayerPoint scrollOffset = controller->GetCurrentAsyncScrollOffset(AsyncPanZoomController::RESPECT_FORCE_DISABLE);

  // Options
  const int verticalPadding = 10;
  const int horizontalPadding = 5;
  gfx::Color backgroundColor(0.3f, 0.3f, 0.3f, 0.3f);
  gfx::Color tileActiveColor(1, 1, 1, 0.4f);
  gfx::Color tileBorderColor(0, 0, 0, 0.1f);
  gfx::Color pageBorderColor(0, 0, 0);
  gfx::Color criticalDisplayPortColor(1.f, 1.f, 0);
  gfx::Color displayPortColor(0, 1.f, 0);
  gfx::Color viewPortColor(0, 0, 1.f, 0.3f);
  gfx::Color visibilityColor(1.f, 0, 0);

  // Rects
  const FrameMetrics& fm = aLayer->GetFrameMetrics(0);
  ParentLayerRect compositionBounds = fm.GetCompositionBounds();
  LayerRect scrollRect = fm.GetScrollableRect() * fm.LayersPixelsPerCSSPixel();
  LayerRect viewRect = ParentLayerRect(scrollOffset, compositionBounds.Size()) / LayerToParentLayerScale(1);
  LayerRect dp = (fm.GetDisplayPort() + fm.GetScrollOffset()) * fm.LayersPixelsPerCSSPixel();
  Maybe<LayerRect> cdp;
  if (!fm.GetCriticalDisplayPort().IsEmpty()) {
    cdp = Some((fm.GetCriticalDisplayPort() + fm.GetScrollOffset()) * fm.LayersPixelsPerCSSPixel());
  }

  // Don't render trivial minimap. They can show up from textboxes and other tiny frames.
  if (viewRect.width < 64 && viewRect.height < 64) {
    return;
  }

  // Compute a scale with an appropriate aspect ratio
  // We allocate up to 100px of width and the height of this layer.
  float scaleFactor;
  float scaleFactorX;
  float scaleFactorY;
  Rect dest = Rect(aClipRect.ToUnknownRect());
  if (aLayer->GetLocalClipRect()) {
    dest = Rect(aLayer->GetLocalClipRect().value().ToUnknownRect());
  } else {
    dest = aContainer->GetEffectiveTransform().Inverse().TransformBounds(dest);
  }
  dest = dest.Intersect(compositionBounds.ToUnknownRect());
  scaleFactorX = std::min(100.f, dest.width - (2 * horizontalPadding)) / scrollRect.width;
  scaleFactorY = (dest.height - (2 * verticalPadding)) / scrollRect.height;
  scaleFactor = std::min(scaleFactorX, scaleFactorY);
  if (scaleFactor <= 0) {
    return;
  }

  Matrix4x4 transform = Matrix4x4::Scaling(scaleFactor, scaleFactor, 1);
  transform.PostTranslate(horizontalPadding + dest.x, verticalPadding + dest.y, 0);

  Rect transformedScrollRect = transform.TransformBounds(scrollRect.ToUnknownRect());

  IntRect clipRect = RoundedOut(aContainer->GetEffectiveTransform().TransformBounds(transformedScrollRect));

  // Render the scrollable area.
  compositor->FillRect(transformedScrollRect, backgroundColor, clipRect, aContainer->GetEffectiveTransform());
  compositor->SlowDrawRect(transformedScrollRect, pageBorderColor, clipRect, aContainer->GetEffectiveTransform());

  // If enabled, render information about visibility.
  if (gfxPrefs::APZMinimapVisibilityEnabled()) {
    // Retrieve the APZC scrollable layer guid, which we'll use to get the
    // appropriate visibility information from the layer manager.
    AsyncPanZoomController* controller = aLayer->GetAsyncPanZoomController(0);
    MOZ_ASSERT(controller);

    ScrollableLayerGuid guid = controller->GetGuid();

    // Get the approximately visible region.
    static CSSIntRegion emptyRegion;
    CSSIntRegion* visibleRegion = aManager->GetApproximatelyVisibleRegion(guid);
    if (!visibleRegion) {
      visibleRegion = &emptyRegion;
    }

    // Iterate through and draw the rects in the region.
    for (CSSIntRegion::RectIterator iterator = visibleRegion->RectIter();
         !iterator.Done();
         iterator.Next())
    {
      CSSIntRect rect = iterator.Get();
      LayerRect scaledRect = rect * fm.LayersPixelsPerCSSPixel();
      Rect r = transform.TransformBounds(scaledRect.ToUnknownRect());
      compositor->FillRect(r, visibilityColor, clipRect, aContainer->GetEffectiveTransform());
    }
  }

  // Render the displayport.
  Rect r = transform.TransformBounds(dp.ToUnknownRect());
  compositor->FillRect(r, tileActiveColor, clipRect, aContainer->GetEffectiveTransform());
  compositor->SlowDrawRect(r, displayPortColor, clipRect, aContainer->GetEffectiveTransform());

  // Render the critical displayport if there is one
  if (cdp) {
    r = transform.TransformBounds(cdp->ToUnknownRect());
    compositor->SlowDrawRect(r, criticalDisplayPortColor, clipRect, aContainer->GetEffectiveTransform());
  }

  // Render the viewport.
  r = transform.TransformBounds(viewRect.ToUnknownRect());
  compositor->SlowDrawRect(r, viewPortColor, clipRect, aContainer->GetEffectiveTransform(), 2);
}


template<class ContainerT> void
RenderLayers(ContainerT* aContainer,
	     LayerManagerComposite* aManager,
	     const RenderTargetIntRect& aClipRect)
{
  Compositor* compositor = aManager->GetCompositor();

  for (size_t i = 0u; i < aContainer->mPrepared->mLayers.Length(); i++) {
    PreparedLayer& preparedData = aContainer->mPrepared->mLayers[i];
    LayerComposite* layerToRender = static_cast<LayerComposite*>(preparedData.mLayer->ImplData());
    const RenderTargetIntRect& clipRect = preparedData.mClipRect;
    Layer* layer = layerToRender->GetLayer();

    if (layerToRender->HasStaleCompositor()) {
      continue;
    }

    if (gfxPrefs::LayersDrawFPS()) {
      for (const auto& metadata : layer->GetAllScrollMetadata()) {
        if (metadata.IsApzForceDisabled()) {
          aManager->DisabledApzWarning();
          break;
        }
      }
    }

    Color color;
    if (layerToRender->NeedToDrawCheckerboarding(&color)) {
      if (gfxPrefs::APZHighlightCheckerboardedAreas()) {
        color = Color(255 / 255.f, 188 / 255.f, 217 / 255.f, 1.f); // "Cotton Candy"
      }
      // Ideally we would want to intersect the checkerboard region from the APZ with the layer bounds
      // and only fill in that area. However the layer bounds takes into account the base translation
      // for the painted layer whereas the checkerboard region does not. One does not simply
      // intersect areas in different coordinate spaces. So we do this a little more permissively
      // and only fill in the background when we know there is checkerboard, which in theory
      // should only occur transiently.
      gfx::IntRect layerBounds = layer->GetLayerBounds();
      EffectChain effectChain(layer);
      effectChain.mPrimaryEffect = new EffectSolidColor(color);
      aManager->GetCompositor()->DrawQuad(gfx::Rect(layerBounds.x, layerBounds.y, layerBounds.width, layerBounds.height),
                                          clipRect.ToUnknownRect(),
                                          effectChain, layer->GetEffectiveOpacity(),
                                          layer->GetEffectiveTransform());
    }

    if (layerToRender->HasLayerBeenComposited()) {
      // Composer2D will compose this layer so skip GPU composition
      // this time. The flag will be reset for the next composition phase
      // at the beginning of LayerManagerComposite::Rener().
      gfx::IntRect clearRect = layerToRender->GetClearRect();
      if (!clearRect.IsEmpty()) {
        // Clear layer's visible rect on FrameBuffer with transparent pixels
        gfx::Rect fbRect(clearRect.x, clearRect.y, clearRect.width, clearRect.height);
        compositor->ClearRect(fbRect);
        layerToRender->SetClearRect(gfx::IntRect(0, 0, 0, 0));
      }
    } else {
      layerToRender->RenderLayer(clipRect.ToUnknownRect());
    }

    if (gfxPrefs::UniformityInfo()) {
      PrintUniformityInfo(layer);
    }

    if (gfxPrefs::DrawLayerInfo()) {
      DrawLayerInfo(clipRect, aManager, layer);
    }

    // Draw a border around scrollable layers.
    // A layer can be scrolled by multiple scroll frames. Draw a border
    // for each.
    // Within the list of scroll frames for a layer, the layer border for a
    // scroll frame lower down is affected by the async transforms on scroll
    // frames higher up, so loop from the top down, and accumulate an async
    // transform as we go along.
    Matrix4x4 asyncTransform;
    for (uint32_t i = layer->GetScrollMetadataCount(); i > 0; --i) {
      if (layer->GetFrameMetrics(i - 1).IsScrollable()) {
        // Since the composition bounds are in the parent layer's coordinates,
        // use the parent's effective transform rather than the layer's own.
        ParentLayerRect compositionBounds = layer->GetFrameMetrics(i - 1).GetCompositionBounds();
        aManager->GetCompositor()->DrawDiagnostics(DiagnosticFlags::CONTAINER,
                                                   compositionBounds.ToUnknownRect(),
                                                   aClipRect.ToUnknownRect(),
                                                   asyncTransform * aContainer->GetEffectiveTransform());
        if (AsyncPanZoomController* apzc = layer->GetAsyncPanZoomController(i - 1)) {
          asyncTransform =
              apzc->GetCurrentAsyncTransformWithOverscroll(AsyncPanZoomController::RESPECT_FORCE_DISABLE).ToUnknownMatrix()
            * asyncTransform;
        }
      }
    }

    if (gfxPrefs::APZMinimap()) {
      RenderMinimap(aContainer, aManager, aClipRect, layer);
    }

    // invariant: our GL context should be current here, I don't think we can
    // assert it though
  }
}

template<class ContainerT> RefPtr<CompositingRenderTarget>
CreateOrRecycleTarget(ContainerT* aContainer,
                      LayerManagerComposite* aManager)
{
  Compositor* compositor = aManager->GetCompositor();
  SurfaceInitMode mode = INIT_MODE_CLEAR;
  gfx::IntRect surfaceRect = ContainerVisibleRect(aContainer);
  if (aContainer->GetLocalVisibleRegion().GetNumRects() == 1 &&
      (aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE))
  {
    mode = INIT_MODE_NONE;
  }

  RefPtr<CompositingRenderTarget>& lastSurf = aContainer->mLastIntermediateSurface;
  if (lastSurf && lastSurf->GetRect().IsEqualEdges(surfaceRect)) {
    if (mode == INIT_MODE_CLEAR) {
      lastSurf->ClearOnBind();
    }

    return lastSurf;
  } else {
    lastSurf = compositor->CreateRenderTarget(surfaceRect, mode);

    return lastSurf;
  }
}

template<class ContainerT> RefPtr<CompositingRenderTarget>
CreateTemporaryTargetAndCopyFromBackground(ContainerT* aContainer,
                                           LayerManagerComposite* aManager)
{
  Compositor* compositor = aManager->GetCompositor();
  gfx::IntRect visibleRect = aContainer->GetLocalVisibleRegion().ToUnknownRegion().GetBounds();
  RefPtr<CompositingRenderTarget> previousTarget = compositor->GetCurrentRenderTarget();
  gfx::IntRect surfaceRect = gfx::IntRect(visibleRect.x, visibleRect.y,
                                          visibleRect.width, visibleRect.height);

  gfx::IntPoint sourcePoint = gfx::IntPoint(visibleRect.x, visibleRect.y);

  gfx::Matrix4x4 transform = aContainer->GetEffectiveTransform();
  DebugOnly<gfx::Matrix> transform2d;
  MOZ_ASSERT(transform.Is2D(&transform2d) && !gfx::ThebesMatrix(transform2d).HasNonIntegerTranslation());
  sourcePoint += gfx::IntPoint::Truncate(transform._41, transform._42);

  sourcePoint -= compositor->GetCurrentRenderTarget()->GetOrigin();

  return compositor->CreateRenderTargetFromSource(surfaceRect, previousTarget, sourcePoint);
}

template<class ContainerT> void
RenderIntermediate(ContainerT* aContainer,
                   LayerManagerComposite* aManager,
                   const gfx::IntRect& aClipRect,
                   RefPtr<CompositingRenderTarget> surface)
{
  Compositor* compositor = aManager->GetCompositor();
  RefPtr<CompositingRenderTarget> previousTarget = compositor->GetCurrentRenderTarget();

  if (!surface) {
    return;
  }

  compositor->SetRenderTarget(surface);
  // pre-render all of the layers into our temporary
  RenderLayers(aContainer, aManager, RenderTargetIntRect::FromUnknownRect(aClipRect));
  // Unbind the current surface and rebind the previous one.
  compositor->SetRenderTarget(previousTarget);
}

template<class ContainerT> void
ContainerRender(ContainerT* aContainer,
                 LayerManagerComposite* aManager,
                 const gfx::IntRect& aClipRect)
{
  MOZ_ASSERT(aContainer->mPrepared);

  if (aContainer->UseIntermediateSurface()) {
    RefPtr<CompositingRenderTarget> surface;

    if (aContainer->mPrepared->mNeedsSurfaceCopy) {
      // we needed to copy the background so we waited until now to render the intermediate
      surface = CreateTemporaryTargetAndCopyFromBackground(aContainer, aManager);
      RenderIntermediate(aContainer, aManager,
                         aClipRect, surface);
    } else {
      surface = aContainer->mPrepared->mTmpTarget;
    }

    if (!surface) {
      aContainer->mPrepared = nullptr;
      return;
    }

    gfx::Rect visibleRect(aContainer->GetLocalVisibleRegion().ToUnknownRegion().GetBounds());
    RefPtr<Compositor> compositor = aManager->GetCompositor();
#ifdef MOZ_DUMP_PAINTING
    if (gfxEnv::DumpCompositorTextures()) {
      RefPtr<gfx::DataSourceSurface> surf = surface->Dump(compositor);
      if (surf) {
        WriteSnapshotToDumpFile(aContainer, surf);
      }
    }
#endif

    RefPtr<ContainerT> container = aContainer;
    RenderWithAllMasks(aContainer, compositor, aClipRect,
                       [&, surface, compositor, container](EffectChain& effectChain, const IntRect& clipRect) {
      effectChain.mPrimaryEffect = new EffectRenderTarget(surface);
      compositor->DrawQuad(visibleRect, clipRect, effectChain,
                           container->GetEffectiveOpacity(),
                           container->GetEffectiveTransform());
    });
  } else {
    RenderLayers(aContainer, aManager, RenderTargetIntRect::FromUnknownRect(aClipRect));
  }
  aContainer->mPrepared = nullptr;

  // If it is a scrollable container layer with no child layers, and one of the APZCs
  // attached to it has a nonempty async transform, then that transform is not applied
  // to any visible content. Display a warning box (conditioned on the FPS display being
  // enabled).
  if (gfxPrefs::LayersDrawFPS() && aContainer->IsScrollInfoLayer()) {
    // Since aContainer doesn't have any children we can just iterate from the top metrics
    // on it down to the bottom using GetFirstChild and not worry about walking onto another
    // underlying layer.
    for (LayerMetricsWrapper i(aContainer); i; i = i.GetFirstChild()) {
      if (AsyncPanZoomController* apzc = i.GetApzc()) {
        if (!apzc->GetAsyncTransformAppliedToContent()
            && !AsyncTransformComponentMatrix(apzc->GetCurrentAsyncTransform(AsyncPanZoomController::NORMAL)).IsIdentity()) {
          aManager->UnusedApzTransformWarning();
          break;
        }
      }
    }
  }
}

ContainerLayerComposite::ContainerLayerComposite(LayerManagerComposite *aManager)
  : ContainerLayer(aManager, nullptr)
  , LayerComposite(aManager)
{
  MOZ_COUNT_CTOR(ContainerLayerComposite);
  mImplData = static_cast<LayerComposite*>(this);
}

ContainerLayerComposite::~ContainerLayerComposite()
{
  MOZ_COUNT_DTOR(ContainerLayerComposite);

  // We don't Destroy() on destruction here because this destructor
  // can be called after remote content has crashed, and it may not be
  // safe to free the IPC resources of our children.  Those resources
  // are automatically cleaned up by IPDL-generated code.
  //
  // In the common case of normal shutdown, either
  // LayerManagerComposite::Destroy(), a parent
  // *ContainerLayerComposite::Destroy(), or Disconnect() will trigger
  // cleanup of our resources.
  while (mFirstChild) {
    RemoveChild(mFirstChild);
  }
}

void
ContainerLayerComposite::Destroy()
{
  if (!mDestroyed) {
    while (mFirstChild) {
      static_cast<LayerComposite*>(GetFirstChild()->ImplData())->Destroy();
      RemoveChild(mFirstChild);
    }
    mDestroyed = true;
  }
}

LayerComposite*
ContainerLayerComposite::GetFirstChildComposite()
{
  if (!mFirstChild) {
    return nullptr;
   }
  return static_cast<LayerComposite*>(mFirstChild->ImplData());
}

void
ContainerLayerComposite::RenderLayer(const gfx::IntRect& aClipRect)
{
  ContainerRender(this, mCompositeManager, aClipRect);
}

void
ContainerLayerComposite::Prepare(const RenderTargetIntRect& aClipRect)
{
  ContainerPrepare(this, mCompositeManager, aClipRect);
}

void
ContainerLayerComposite::CleanupResources()
{
  mLastIntermediateSurface = nullptr;
  mPrepared = nullptr;

  for (Layer* l = GetFirstChild(); l; l = l->GetNextSibling()) {
    LayerComposite* layerToCleanup = static_cast<LayerComposite*>(l->ImplData());
    layerToCleanup->CleanupResources();
  }
}

RefLayerComposite::RefLayerComposite(LayerManagerComposite* aManager)
  : RefLayer(aManager, nullptr)
  , LayerComposite(aManager)
{
  mImplData = static_cast<LayerComposite*>(this);
}

RefLayerComposite::~RefLayerComposite()
{
  Destroy();
}

void
RefLayerComposite::Destroy()
{
  MOZ_ASSERT(!mFirstChild);
  mDestroyed = true;
}

LayerComposite*
RefLayerComposite::GetFirstChildComposite()
{
  if (!mFirstChild) {
    return nullptr;
   }
  return static_cast<LayerComposite*>(mFirstChild->ImplData());
}

void
RefLayerComposite::RenderLayer(const gfx::IntRect& aClipRect)
{
  ContainerRender(this, mCompositeManager, aClipRect);
}

void
RefLayerComposite::Prepare(const RenderTargetIntRect& aClipRect)
{
  ContainerPrepare(this, mCompositeManager, aClipRect);
}

void
RefLayerComposite::CleanupResources()
{
  mLastIntermediateSurface = nullptr;
  mPrepared = nullptr;
}

} // namespace layers
} // namespace mozilla