Quellcode-Bibliothek nsLayoutUtils.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsLayoutUtils.h"

#include <algorithm>
#include <limits>

#include "ActiveLayerTracker.h"
#include "DisplayItemClip.h"
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxDrawable.h"
#include "gfxEnv.h"
#include "gfxMatrix.h"
#include "gfxPlatform.h"
#include "gfxRect.h"
#include "gfxTypes.h"
#include "gfxUtils.h"
#include "ImageContainer.h"
#include "ImageOps.h"
#include "ImageRegion.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "LayoutLogging.h"
#include "MobileViewportManager.h"
#include "mozilla/AccessibleCaretEventHub.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Baseline.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/glean/GfxMetrics.h"
#include "mozilla/dom/AnonymousContent.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/CanvasUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/DOMRect.h"
#include "mozilla/dom/DOMStringList.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLMediaElementBinding.h"
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/InspectorFontFace.h"
#include "mozilla/dom/ImageBitmap.h"
#include "mozilla/dom/InteractiveWidget.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "mozilla/dom/SVGViewportElement.h"
#include "mozilla/dom/UIEvent.h"
#include "mozilla/dom/VideoFrame.h"
#include "mozilla/dom/VideoFrameBinding.h"
#include "mozilla/intl/BidiEmbeddingLevel.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "mozilla/layers/APZPublicUtils.h"  // for apz::CalculatePendingDisplayPort
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/PAPZ.h"
#include "mozilla/layers/StackingContextHelper.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/Likely.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/PerfStats.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/ScrollOrigin.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/ServoStyleSetInlines.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_font.h"
#include "mozilla/StaticPrefs_general.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/SVGImageContext.h"
#include "mozilla/SVGIntegrationUtils.h"
#include "mozilla/SVGTextFrame.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ToString.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportFrame.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/WheelHandlingHelper.h"  // for WheelHandlingUtils
#include "nsAnimationManager.h"
#include "nsAtom.h"
#include "nsBidiPresUtils.h"
#include "nsBlockFrame.h"
#include "nsCanvasFrame.h"
#include "nsCaret.h"
#include "nsCharTraits.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsContentUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSColorUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRendering.h"
#include "nsDisplayList.h"
#include "nsFieldSetFrame.h"
#include "nsFlexContainerFrame.h"
#include "nsFontInflationData.h"
#include "nsFontMetrics.h"
#include "nsFrameList.h"
#include "nsFrameSelection.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsICanvasRenderingContextInternal.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsIDocShell.h"
#include "nsIDocumentViewer.h"
#include "nsIFrameInlines.h"
#include "nsIImageLoadingContent.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIWidget.h"
#include "nsListControlFrame.h"
#include "nsMenuPopupFrame.h"
#include "nsPIDOMWindow.h"
#include "nsPlaceholderFrame.h"
#include "nsPresContext.h"
#include "nsPresContextInlines.h"
#include "nsRefreshDriver.h"
#include "nsRegion.h"
#include "nsStyleConsts.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "nsSubDocumentFrame.h"
#include "nsTableWrapperFrame.h"
#include "nsTArray.h"
#include "nsTextFragment.h"
#include "nsTextFrame.h"
#include "nsTHashMap.h"
#include "nsTransitionManager.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "prenv.h"
#include "RegionBuilder.h"
#include "RetainedDisplayListBuilder.h"
#include "TextDrawTarget.h"
#include "UnitTransforms.h"
#include "ViewportFrame.h"

#include "nsXULPopupManager.h"

// Make sure getpid() works.
#ifdef XP_WIN
#  include <process.h>
#  define getpid _getpid
#else
#  include <unistd.h>
#endif

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::image;
using namespace mozilla::layers;
using namespace mozilla::layout;
using namespace mozilla::gfx;
using mozilla::dom::HTMLMediaElement_Binding::HAVE_METADATA;
using mozilla::dom::HTMLMediaElement_Binding::HAVE_NOTHING;

typedef ScrollableLayerGuid::ViewID ViewID;
typedef nsStyleTransformMatrix::TransformReferenceBox TransformReferenceBox;

static ViewID sScrollIdCounter = ScrollableLayerGuid::START_SCROLL_ID;

typedef nsTHashMap<nsUint64HashKey, nsIContent*> ContentMap;
static StaticAutoPtr<ContentMap> sContentMap;

static ContentMap& GetContentMap() {
  if (!sContentMap) {
    sContentMap = new ContentMap();
  }
  return *sContentMap;
}

template <typename TestType>
static bool HasMatchingAnimations(EffectSet& aEffects, TestType&& aTest) {
  for (KeyframeEffect* effect : aEffects) {
    if (!effect->GetAnimation() || !effect->GetAnimation()->IsRelevant()) {
      continue;
    }

    if (aTest(*effect, aEffects)) {
      return true;
    }
  }

  return false;
}

template <typename TestType>
static bool HasMatchingAnimations(const nsIFrame* aFrame,
                                  const nsCSSPropertyIDSet& aPropertySet,
                                  TestType&& aTest) {
  MOZ_ASSERT(aFrame);

  if (!aFrame->MayHaveOpacityAnimation() &&
      aPropertySet.IsSubsetOf(nsCSSPropertyIDSet::OpacityProperties())) {
    return false;
  }

  if (!aFrame->MayHaveTransformAnimation() &&
      aPropertySet.IsSubsetOf(nsCSSPropertyIDSet::TransformLikeProperties())) {
    return false;
  }

  EffectSet* effectSet = EffectSet::GetForFrame(aFrame, aPropertySet);
  if (!effectSet) {
    return false;
  }

  return HasMatchingAnimations(*effectSet, aTest);
}

/* static */
bool nsLayoutUtils::HasAnimationOfPropertySet(
    const nsIFrame* aFrame, const nsCSSPropertyIDSet& aPropertySet) {
  return HasMatchingAnimations(
      aFrame, aPropertySet,
      [&aPropertySet](KeyframeEffect& aEffect, const EffectSet&) {
        return aEffect.HasAnimationOfPropertySet(aPropertySet);
      });
}

/* static */
bool nsLayoutUtils::HasAnimationOfPropertySet(
    const nsIFrame* aFrame, const nsCSSPropertyIDSet& aPropertySet,
    EffectSet* aEffectSet) {
  MOZ_ASSERT(
      !aEffectSet || EffectSet::GetForFrame(aFrame, aPropertySet) == aEffectSet,
      "The EffectSet, if supplied, should match what we would otherwise fetch");

  if (!aEffectSet) {
    return nsLayoutUtils::HasAnimationOfPropertySet(aFrame, aPropertySet);
  }

  if (!aEffectSet->MayHaveTransformAnimation() &&
      aPropertySet.IsSubsetOf(nsCSSPropertyIDSet::TransformLikeProperties())) {
    return false;
  }

  if (!aEffectSet->MayHaveOpacityAnimation() &&
      aPropertySet.IsSubsetOf(nsCSSPropertyIDSet::OpacityProperties())) {
    return false;
  }

  return HasMatchingAnimations(
      *aEffectSet,
      [&aPropertySet](KeyframeEffect& aEffect, const EffectSet& aEffectSet) {
        return aEffect.HasAnimationOfPropertySet(aPropertySet);
      });
}

/* static */
bool nsLayoutUtils::HasAnimationOfTransformAndMotionPath(
    const nsIFrame* aFrame) {
  auto returnValue = [&]() -> bool {
    return nsLayoutUtils::HasAnimationOfPropertySet(
               aFrame,
               nsCSSPropertyIDSet{eCSSProperty_transform,
                                  eCSSProperty_translate, eCSSProperty_rotate,
                                  eCSSProperty_scale,
                                  eCSSProperty_offset_path}) ||
           (!aFrame->StyleDisplay()->mOffsetPath.IsNone() &&
            nsLayoutUtils::HasAnimationOfPropertySet(
                aFrame, nsCSSPropertyIDSet::MotionPathProperties()));
  };

  if (!aFrame->MayHaveTransformAnimation()) {
    MOZ_ASSERT(!returnValue());
    return false;
  }
  return returnValue();
}

/* static */
bool nsLayoutUtils::HasEffectiveAnimation(
    const nsIFrame* aFrame, const nsCSSPropertyIDSet& aPropertySet) {
  return HasMatchingAnimations(
      aFrame, aPropertySet,
      [&aPropertySet](KeyframeEffect& aEffect, const EffectSet& aEffectSet) {
        return aEffect.HasEffectiveAnimationOfPropertySet(aPropertySet,
                                                          aEffectSet);
      });
}

/* static */
nsCSSPropertyIDSet nsLayoutUtils::GetAnimationPropertiesForCompositor(
    const nsIFrame* aStyleFrame) {
  nsCSSPropertyIDSet properties;

  // We fetch the effects for the style frame here since this method is called
  // by RestyleManager::AddLayerChangesForAnimation which takes care to apply
  // the relevant hints to the primary frame as needed.
  EffectSet* effects = EffectSet::GetForStyleFrame(aStyleFrame);
  if (!effects) {
    return properties;
  }

  AnimationPerformanceWarning::Type warning;
  if (!EffectCompositor::AllowCompositorAnimationsOnFrame(aStyleFrame,
                                                          warning)) {
    return properties;
  }

  for (const KeyframeEffect* effect : *effects) {
    properties |= effect->GetPropertiesForCompositor(*effects, aStyleFrame);
  }

  // If properties only have motion-path properties, we have to make sure they
  // have effects. i.e. offset-path is not none or we have offset-path
  // animations.
  if (properties.IsSubsetOf(nsCSSPropertyIDSet::MotionPathProperties()) &&
      !properties.HasProperty(eCSSProperty_offset_path) &&
      aStyleFrame->StyleDisplay()->mOffsetPath.IsNone()) {
    properties.Empty();
  }

  return properties;
}

static float GetSuitableScale(float aMaxScale, float aMinScale,
                              nscoord aVisibleDimension,
                              nscoord aDisplayDimension) {
  float displayVisibleRatio =
      float(aDisplayDimension) / float(aVisibleDimension);
  // We want to rasterize based on the largest scale used during the
  // transform animation, unless that would make us rasterize something
  // larger than the screen.  But we never want to go smaller than the
  // minimum scale over the animation.
  if (FuzzyEqualsMultiplicative(displayVisibleRatio, aMaxScale, .01f)) {
    // Using aMaxScale may make us rasterize something a fraction larger than
    // the screen. However, if aMaxScale happens to be the final scale of a
    // transform animation it is better to use aMaxScale so that for the
    // fraction of a second before we delayerize the composited texture it has
    // a better chance of being pixel aligned and composited without resampling
    // (avoiding visually clunky delayerization).
    return aMaxScale;
  }
  return std::clamp(displayVisibleRatio, aMinScale, aMaxScale);
}

// The first value in this pair is the min scale, and the second one is the max
// scale.
using MinAndMaxScale = std::pair<MatrixScales, MatrixScales>;

static inline void UpdateMinMaxScale(const nsIFrame* aFrame,
                                     const AnimationValue& aValue,
                                     MinAndMaxScale& aMinAndMaxScale) {
  MatrixScales size = aValue.GetScaleValue(aFrame);
  MatrixScales& minScale = aMinAndMaxScale.first;
  MatrixScales& maxScale = aMinAndMaxScale.second;

  minScale = Min(minScale, size);
  maxScale = Max(maxScale, size);
}

// The final transform matrix is calculated by merging the final results of each
// transform-like properties, so do the scale factors. In other words, the
// potential min/max scales could be gotten by multiplying the max/min scales of
// each properties.
//
// For example, there is an animation:
//   from { "transform: scale(1, 1)", "scale: 3, 3" };
//   to   { "transform: scale(2, 2)", "scale: 1, 1" };
//
// the min scale is (1, 1) * (1, 1) = (1, 1), and
// The max scale is (2, 2) * (3, 3) = (6, 6).
// This means we multiply the min/max scale factor of transform property and the
// min/max scale factor of scale property to get the final max/min scale factor.
static Array<MinAndMaxScale, 2> GetMinAndMaxScaleForAnimationProperty(
    const nsIFrame* aFrame,
    const nsTArray<RefPtr<dom::Animation>>& aAnimations) {
  // We use a fixed array to store the min/max scales for each property.
  // The first element in the array is for eCSSProperty_transform, and the
  // second one is for eCSSProperty_scale.
  const MinAndMaxScale defaultValue =
      std::make_pair(MatrixScales(std::numeric_limits<float>::max(),
                                  std::numeric_limits<float>::max()),
                     MatrixScales(std::numeric_limits<float>::min(),
                                  std::numeric_limits<float>::min()));
  Array<MinAndMaxScale, 2> minAndMaxScales(defaultValue, defaultValue);

  for (dom::Animation* anim : aAnimations) {
    // This method is only expected to be passed animations that are running on
    // the compositor and we only pass playing animations to the compositor,
    // which are, by definition, "relevant" animations (animations that are
    // not yet finished or which are filling forwards).
    MOZ_ASSERT(anim->IsRelevant());

    const dom::KeyframeEffect* effect =
        anim->GetEffect() ? anim->GetEffect()->AsKeyframeEffect() : nullptr;
    MOZ_ASSERT(effect, "A playing animation should have a keyframe effect");
    for (const AnimationProperty& prop : effect->Properties()) {
      if (prop.mProperty.mID != eCSSProperty_transform &&
          prop.mProperty.mID != eCSSProperty_scale) {
        continue;
      }

      // 0: eCSSProperty_transform.
      // 1: eCSSProperty_scale.
      MinAndMaxScale& scales =
          minAndMaxScales[prop.mProperty.mID == eCSSProperty_transform ? 0 : 1];

      // We need to factor in the scale of the base style if the base style
      // will be used on the compositor.
      const AnimationValue& baseStyle = effect->BaseStyle(prop.mProperty);
      if (!baseStyle.IsNull()) {
        UpdateMinMaxScale(aFrame, baseStyle, scales);
      }

      for (const AnimationPropertySegment& segment : prop.mSegments) {
        // In case of add or accumulate composite, StyleAnimationValue does
        // not have a valid value.
        if (segment.HasReplaceableFromValue()) {
          UpdateMinMaxScale(aFrame, segment.mFromValue, scales);
        }

        if (segment.HasReplaceableToValue()) {
          UpdateMinMaxScale(aFrame, segment.mToValue, scales);
        }
      }
    }
  }

  return minAndMaxScales;
}

MatrixScales nsLayoutUtils::ComputeSuitableScaleForAnimation(
    const nsIFrame* aFrame, const nsSize& aVisibleSize,
    const nsSize& aDisplaySize) {
  const nsTArray<RefPtr<dom::Animation>> compositorAnimations =
      EffectCompositor::GetAnimationsForCompositor(
          aFrame,
          nsCSSPropertyIDSet{eCSSProperty_transform, eCSSProperty_scale});

  if (compositorAnimations.IsEmpty()) {
    return MatrixScales();
  }

  const Array<MinAndMaxScale, 2> minAndMaxScales =
      GetMinAndMaxScaleForAnimationProperty(aFrame, compositorAnimations);

  // This might cause an issue if users use std::numeric_limits<float>::min()
  // (or max()) as the scale value. However, in this case, we may render an
  // extreme small (or large) element, so this may not be a problem. If so,
  // please fix this.
  MatrixScales maxScale(std::numeric_limits<float>::min(),
                        std::numeric_limits<float>::min());
  MatrixScales minScale(std::numeric_limits<float>::max(),
                        std::numeric_limits<float>::max());

  auto isUnset = [](const MatrixScales& aMax, const MatrixScales& aMin) {
    return aMax.xScale == std::numeric_limits<float>::min() &&
           aMax.yScale == std::numeric_limits<float>::min() &&
           aMin.xScale == std::numeric_limits<float>::max() &&
           aMin.yScale == std::numeric_limits<float>::max();
  };

  // Iterate the slots to get the final scale value.
  for (const auto& pair : minAndMaxScales) {
    const MatrixScales& currMinScale = pair.first;
    const MatrixScales& currMaxScale = pair.second;

    if (isUnset(currMaxScale, currMinScale)) {
      // We don't have this animation property, so skip.
      continue;
    }

    if (isUnset(maxScale, minScale)) {
      // Initialize maxScale and minScale.
      maxScale = currMaxScale;
      minScale = currMinScale;
    } else {
      // The scale factors of each transform-like property should be multiplied
      // by others because we merge their sampled values as a final matrix by
      // matrix multiplication, so here we multiply the scale factors by the
      // previous one to get the possible max and min scale factors.
      maxScale = maxScale * currMaxScale;
      minScale = minScale * currMinScale;
    }
  }

  if (isUnset(maxScale, minScale)) {
    // We didn't encounter any transform-like property.
    return MatrixScales();
  }

  return MatrixScales(
      GetSuitableScale(maxScale.xScale, minScale.xScale, aVisibleSize.width,
                       aDisplaySize.width),
      GetSuitableScale(maxScale.yScale, minScale.yScale, aVisibleSize.height,
                       aDisplaySize.height));
}

bool nsLayoutUtils::AreAsyncAnimationsEnabled() {
  return StaticPrefs::layers_offmainthreadcomposition_async_animations() &&
         gfxPlatform::OffMainThreadCompositingEnabled();
}

bool nsLayoutUtils::AreRetainedDisplayListsEnabled() {
#ifdef MOZ_WIDGET_ANDROID
  return StaticPrefs::layout_display_list_retain();
#else
  if (XRE_IsContentProcess()) {
    return StaticPrefs::layout_display_list_retain();
  }

  if (XRE_IsE10sParentProcess()) {
    return StaticPrefs::layout_display_list_retain_chrome();
  }

  // Retained display lists require e10s.
  return false;
#endif
}

bool nsLayoutUtils::DisplayRootHasRetainedDisplayListBuilder(nsIFrame* aFrame) {
  return GetRetainedDisplayListBuilder(aFrame) != nullptr;
}

RetainedDisplayListBuilder* nsLayoutUtils::GetRetainedDisplayListBuilder(
    nsIFrame* aFrame) {
  MOZ_ASSERT(aFrame);
  MOZ_ASSERT(aFrame->PresShell());

  // Use the pres shell root frame to get the display root frame. This skips
  // the early exit in |nsLayoutUtils::GetDisplayRootFrame()| for popup frames.
  const nsIFrame* rootFrame = aFrame->PresShell()->GetRootFrame();
  if (!rootFrame) {
    return nullptr;
  }

  const nsIFrame* displayRootFrame = GetDisplayRootFrame(rootFrame);
  MOZ_ASSERT(displayRootFrame);

  return displayRootFrame->GetProperty(RetainedDisplayListBuilder::Cached());
}

void nsLayoutUtils::UnionChildOverflow(nsIFrame* aFrame,
                                       OverflowAreas& aOverflowAreas,
                                       FrameChildListIDs aSkipChildLists) {
  for (const auto& [list, listID] : aFrame->ChildLists()) {
    if (aSkipChildLists.contains(listID)) {
      continue;
    }
    for (nsIFrame* child : list) {
      aOverflowAreas.UnionWith(
          child->GetActualAndNormalOverflowAreasRelativeToParent());
    }
  }
}

static void DestroyViewID(void* aObject, nsAtom* aPropertyName,
                          void* aPropertyValue, void* aData) {
  ViewID* id = static_cast<ViewID*>(aPropertyValue);
  GetContentMap().Remove(*id);
  delete id;
}

/**
* A namespace class for static layout utilities.
*/

bool nsLayoutUtils::FindIDFor(const nsIContent* aContent, ViewID* aOutViewId) {
  void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
  if (scrollIdProperty) {
    *aOutViewId = *static_cast<ViewID*>(scrollIdProperty);
    return true;
  }
  return false;
}

ViewID nsLayoutUtils::FindOrCreateIDFor(nsIContent* aContent) {
  ViewID scrollId;

  if (!FindIDFor(aContent, &scrollId)) {
    scrollId = sScrollIdCounter++;
    aContent->SetProperty(nsGkAtoms::RemoteId, new ViewID(scrollId),
                          DestroyViewID);
    GetContentMap().InsertOrUpdate(scrollId, aContent);
  }

  return scrollId;
}

nsIContent* nsLayoutUtils::FindContentFor(ViewID aId) {
  MOZ_ASSERT(aId != ScrollableLayerGuid::NULL_SCROLL_ID,
             "Cannot find a content element in map for null IDs.");
  nsIContent* content;
  bool exists = GetContentMap().Get(aId, &content);

  if (exists) {
    return content;
  } else {
    return nullptr;
  }
}

nsIFrame* nsLayoutUtils::GetScrollContainerFrameFromContent(
    nsIContent* aContent) {
  nsIFrame* frame = aContent->GetPrimaryFrame();
  if (aContent->OwnerDoc()->GetRootElement() == aContent) {
    PresShell* presShell = frame ? frame->PresShell() : nullptr;
    if (!presShell) {
      presShell = aContent->OwnerDoc()->GetPresShell();
    }
    // We want the scroll container frame, the root scroll frame differs from
    // all others in that the primary frame is not the scroll frame.
    nsIFrame* rootScrollContainerFrame =
        presShell ? presShell->GetRootScrollContainerFrame() : nullptr;
    if (rootScrollContainerFrame) {
      frame = rootScrollContainerFrame;
    }
  }
  return frame;
}

ScrollContainerFrame* nsLayoutUtils::FindScrollContainerFrameFor(
    nsIContent* aContent) {
  nsIFrame* scrollContainerFrame = GetScrollContainerFrameFromContent(aContent);
  return scrollContainerFrame ? scrollContainerFrame->GetScrollTargetFrame()
                              : nullptr;
}

ScrollContainerFrame* nsLayoutUtils::FindScrollContainerFrameFor(ViewID aId) {
  nsIContent* content = FindContentFor(aId);
  if (!content) {
    return nullptr;
  }

  return FindScrollContainerFrameFor(content);
}

ViewID nsLayoutUtils::FindIDForScrollContainerFrame(
    ScrollContainerFrame* aScrollContainerFrame) {
  if (!aScrollContainerFrame) {
    return ScrollableLayerGuid::NULL_SCROLL_ID;
  }

  nsIContent* scrollContent = aScrollContainerFrame->GetContent();

  ScrollableLayerGuid::ViewID scrollId;
  if (scrollContent && nsLayoutUtils::FindIDFor(scrollContent, &scrollId)) {
    return scrollId;
  }

  return ScrollableLayerGuid::NULL_SCROLL_ID;
}

bool nsLayoutUtils::UsesAsyncScrolling(nsIFrame* aFrame) {
#ifdef MOZ_WIDGET_ANDROID
  // We always have async scrolling for android
  return true;
#endif

  return AsyncPanZoomEnabled(aFrame);
}

bool nsLayoutUtils::AsyncPanZoomEnabled(const nsIFrame* aFrame) {
  // We use this as a shortcut, since if the compositor will never use APZ,
  // no widget will either.
  if (!gfxPlatform::AsyncPanZoomEnabled()) {
    return false;
  }

  const nsIFrame* frame = nsLayoutUtils::GetDisplayRootFrame(aFrame);
  nsIWidget* widget = frame->GetNearestWidget();
  if (!widget) {
    return false;
  }
  return widget->AsyncPanZoomEnabled();
}

bool nsLayoutUtils::AllowZoomingForDocument(
    const mozilla::dom::Document* aDocument) {
  if (aDocument->GetPresShell() &&
      !aDocument->GetPresShell()->AsyncPanZoomEnabled()) {
    return false;
  }
  // True if we allow zooming for all documents on this platform, or if we are
  // in RDM.
  BrowsingContext* bc = aDocument->GetBrowsingContext();
  return StaticPrefs::apz_allow_zooming() || (bc && bc->InRDMPane());
}

static bool HasVisibleAnonymousContents(Document* aDoc) {
  for (RefPtr<AnonymousContent>& ac : aDoc->GetAnonymousContents()) {
    // We check to see if the anonymous content node has a frame. If it doesn't,
    // that means that's not visible to the user because e.g. it's display:none.
    // For now we assume that if it has a frame, it is visible. We might be able
    // to refine this further by adding complexity if it turns out this
    // condition results in a lot of false positives.
    if (ac->Host()->GetPrimaryFrame()) {
      return true;
    }
  }
  return false;
}

bool nsLayoutUtils::ShouldDisableApzForElement(nsIContent* aContent) {
  if (!aContent) {
    return false;
  }

  if (aContent->GetProperty(nsGkAtoms::apzDisabled)) {
    return true;
  }

  Document* doc = aContent->GetComposedDoc();
  if (PresShell* rootPresShell =
          APZCCallbackHelper::GetRootContentDocumentPresShellForContent(
              aContent)) {
    if (Document* rootDoc = rootPresShell->GetDocument()) {
      nsIFrame* rootScrollContainerFrame =
          rootPresShell->GetRootScrollContainerFrame();
      nsIContent* rootContent = rootScrollContainerFrame
                                    ? rootScrollContainerFrame->GetContent()
                                    : rootDoc->GetDocumentElement();
      // For the AccessibleCaret and other anonymous contents: disable APZ on
      // any scrollable subframes that are not the root scrollframe of a
      // document, if the document has any visible anonymous contents.
      //
      // If we find this is triggering in too many scenarios then we might
      // want to tighten this check further. The main use cases for which we
      // want to disable APZ as of this writing are listed in bug 1316318.
      if (aContent != rootContent && HasVisibleAnonymousContents(rootDoc)) {
        return true;
      }
    }
  }

  if (!doc) {
    return false;
  }

  if (PresShell* presShell = doc->GetPresShell()) {
    if (RefPtr<AccessibleCaretEventHub> eventHub =
            presShell->GetAccessibleCaretEventHub()) {
      // Disable APZ for all elements if AccessibleCaret tells us to do so.
      if (eventHub->ShouldDisableApz()) {
        return true;
      }
    }
  }

  return StaticPrefs::apz_disable_for_scroll_linked_effects() &&
         doc->HasScrollLinkedEffect();
}

void nsLayoutUtils::NotifyPaintSkipTransaction(ViewID aScrollId) {
  if (ScrollContainerFrame* sf =
          nsLayoutUtils::FindScrollContainerFrameFor(aScrollId)) {
    MOZ_ASSERT(sf && sf->PresShell() &&
               !sf->PresShell()->IsResolutionUpdated());
    sf->NotifyApzTransaction();
  }
}

nsContainerFrame* nsLayoutUtils::LastContinuationWithChild(
    nsContainerFrame* aFrame) {
  MOZ_ASSERT(aFrame, "NULL frame pointer");
  for (auto f = aFrame->LastContinuation(); f; f = f->GetPrevContinuation()) {
    for (const auto& childList : f->ChildLists()) {
      if (MOZ_LIKELY(!childList.mList.IsEmpty())) {
        return static_cast<nsContainerFrame*>(f);
      }
    }
  }
  return aFrame;
}

// static
FrameChildListID nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame) {
  FrameChildListID id = FrameChildListID::Principal;

  MOZ_DIAGNOSTIC_ASSERT(!aChildFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW));

  if (aChildFrame->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
    nsIFrame* pif = aChildFrame->GetPrevInFlow();
    if (pif->GetParent() == aChildFrame->GetParent()) {
      id = FrameChildListID::ExcessOverflowContainers;
    } else {
      id = FrameChildListID::OverflowContainers;
    }
  } else {
    LayoutFrameType childType = aChildFrame->Type();
    if (LayoutFrameType::TableColGroup == childType) {
      id = FrameChildListID::ColGroup;
    } else if (aChildFrame->IsTableCaption()) {
      id = FrameChildListID::Caption;
    } else {
      id = FrameChildListID::Principal;
    }
  }

#ifdef DEBUG
  // Verify that the frame is actually in that child list or in the
  // corresponding overflow list.
  nsContainerFrame* parent = aChildFrame->GetParent();
  bool found = parent->GetChildList(id).ContainsFrame(aChildFrame);
  if (!found) {
    found = parent->GetChildList(FrameChildListID::Overflow)
                .ContainsFrame(aChildFrame);
    MOZ_ASSERT(found, "not in child list");
  }
#endif

  return id;
}

static Element* GetPseudo(const nsIContent* aContent, nsAtom* aPseudoProperty) {
  MOZ_ASSERT(aPseudoProperty == nsGkAtoms::beforePseudoProperty ||
             aPseudoProperty == nsGkAtoms::afterPseudoProperty ||
             aPseudoProperty == nsGkAtoms::markerPseudoProperty);
  if (!aContent->MayHaveAnonymousChildren()) {
    return nullptr;
  }
  return static_cast<Element*>(aContent->GetProperty(aPseudoProperty));
}

/*static*/
Element* nsLayoutUtils::GetBeforePseudo(const nsIContent* aContent) {
  return GetPseudo(aContent, nsGkAtoms::beforePseudoProperty);
}

/*static*/
nsIFrame* nsLayoutUtils::GetBeforeFrame(const nsIContent* aContent) {
  Element* pseudo = GetBeforePseudo(aContent);
  return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}

/*static*/
Element* nsLayoutUtils::GetAfterPseudo(const nsIContent* aContent) {
  return GetPseudo(aContent, nsGkAtoms::afterPseudoProperty);
}

/*static*/
nsIFrame* nsLayoutUtils::GetAfterFrame(const nsIContent* aContent) {
  Element* pseudo = GetAfterPseudo(aContent);
  return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}

/*static*/
Element* nsLayoutUtils::GetMarkerPseudo(const nsIContent* aContent) {
  return GetPseudo(aContent, nsGkAtoms::markerPseudoProperty);
}

/*static*/
nsIFrame* nsLayoutUtils::GetMarkerFrame(const nsIContent* aContent) {
  Element* pseudo = GetMarkerPseudo(aContent);
  return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}

#ifdef ACCESSIBILITY
void nsLayoutUtils::GetMarkerSpokenText(const nsIContent* aContent,
                                        nsAString& aText) {
  MOZ_ASSERT(aContent && aContent->IsGeneratedContentContainerForMarker());

  aText.Truncate();

  nsIFrame* frame = aContent->GetPrimaryFrame();
  if (!frame) {
    return;
  }

  if (!frame->StyleContent()->NonAltContentItems().IsEmpty()) {
    for (nsIFrame* child : frame->PrincipalChildList()) {
      nsIFrame::RenderedText text = child->GetRenderedText();
      aText += text.mString;
    }
    return;
  }

  if (!frame->StyleList()->mListStyleImage.IsNone()) {
    // ::marker is an image, so use default bullet character.
    static const char16_t kDiscMarkerString[] = {0x2022, ' ', 0};
    aText.AssignLiteral(kDiscMarkerString);
    return;
  }

  frame->PresContext()
      ->FrameConstructor()
      ->GetContainStyleScopeManager()
      .GetSpokenCounterText(frame, aText);
}
#endif

// static
nsIFrame* nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame,
                                               LayoutFrameType aFrameType,
                                               nsIFrame* aStopAt) {
  for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
    if (frame->Type() == aFrameType) {
      return frame;
    }
    if (frame == aStopAt) {
      break;
    }
  }
  return nullptr;
}

/* static */
nsIFrame* nsLayoutUtils::GetPageFrame(nsIFrame* aFrame) {
  return GetClosestFrameOfType(aFrame, LayoutFrameType::Page);
}

/* static */
nsIFrame* nsLayoutUtils::GetStyleFrame(nsIFrame* aPrimaryFrame) {
  MOZ_ASSERT(aPrimaryFrame);
  if (aPrimaryFrame->IsTableWrapperFrame()) {
    nsIFrame* inner = aPrimaryFrame->PrincipalChildList().FirstChild();
    // inner may be null, if aPrimaryFrame is mid-destruction
    return inner;
  }

  return aPrimaryFrame;
}

const nsIFrame* nsLayoutUtils::GetStyleFrame(const nsIFrame* aPrimaryFrame) {
  return nsLayoutUtils::GetStyleFrame(const_cast<nsIFrame*>(aPrimaryFrame));
}

nsIFrame* nsLayoutUtils::GetStyleFrame(const nsIContent* aContent) {
  nsIFrame* frame = aContent->GetPrimaryFrame();
  if (!frame) {
    return nullptr;
  }

  return nsLayoutUtils::GetStyleFrame(frame);
}

CSSIntCoord nsLayoutUtils::UnthemedScrollbarSize(StyleScrollbarWidth aWidth) {
  switch (aWidth) {
    case StyleScrollbarWidth::Auto:
      return 12;
    case StyleScrollbarWidth::Thin:
      return 6;
    case StyleScrollbarWidth::None:
      return 0;
  }
  return 0;
}

/* static */
nsIFrame* nsLayoutUtils::GetPrimaryFrameFromStyleFrame(nsIFrame* aStyleFrame) {
  nsIFrame* parent = aStyleFrame->GetParent();
  return parent && parent->IsTableWrapperFrame() ? parent : aStyleFrame;
}

/* static */
const nsIFrame* nsLayoutUtils::GetPrimaryFrameFromStyleFrame(
    const nsIFrame* aStyleFrame) {
  return nsLayoutUtils::GetPrimaryFrameFromStyleFrame(
      const_cast<nsIFrame*>(aStyleFrame));
}

/*static*/
bool nsLayoutUtils::IsPrimaryStyleFrame(const nsIFrame* aFrame) {
  if (aFrame->IsTableWrapperFrame()) {
    return false;
  }

  const nsIFrame* parent = aFrame->GetParent();
  if (parent && parent->IsTableWrapperFrame()) {
    return parent->PrincipalChildList().FirstChild() == aFrame;
  }

  return aFrame->IsPrimaryFrame();
}

nsIFrame* nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
  NS_ASSERTION(aFrame->IsPlaceholderFrame(), "Must have a placeholder here");
  if (aFrame->HasAnyStateBits(PLACEHOLDER_FOR_FLOAT)) {
    nsIFrame* outOfFlowFrame =
        nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
    NS_ASSERTION(outOfFlowFrame && outOfFlowFrame->IsFloating(),
                 "How did that happen?");
    return outOfFlowFrame;
  }

  return nullptr;
}

// static
nsIFrame* nsLayoutUtils::GetCrossDocParentFrameInProcess(
    const nsIFrame* aFrame, nsPoint* aCrossDocOffset) {
  nsIFrame* p = aFrame->GetParent();
  if (p) {
    return p;
  }

  nsView* v = aFrame->GetView();
  if (!v) {
    return nullptr;
  }
  v = v->GetParent();  // anonymous inner view
  if (!v) {
    return nullptr;
  }
  v = v->GetParent();  // subdocumentframe's view
  if (!v) {
    return nullptr;
  }

  p = v->GetFrame();
  if (p && aCrossDocOffset) {
    nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(p);
    MOZ_ASSERT(subdocumentFrame);
    *aCrossDocOffset += subdocumentFrame->GetExtraOffset();
  }

  return p;
}

// static
nsIFrame* nsLayoutUtils::GetCrossDocParentFrame(const nsIFrame* aFrame,
                                                nsPoint* aCrossDocOffset) {
  return GetCrossDocParentFrameInProcess(aFrame, aCrossDocOffset);
}

// static
bool nsLayoutUtils::IsProperAncestorFrameCrossDoc(
    const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
    const nsIFrame* aCommonAncestor) {
  if (aFrame == aAncestorFrame) {
    return false;
  }
  return IsAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
}

// static
bool nsLayoutUtils::IsProperAncestorFrameCrossDocInProcess(
    const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
    const nsIFrame* aCommonAncestor) {
  if (aFrame == aAncestorFrame) {
    return false;
  }
  return IsAncestorFrameCrossDocInProcess(aAncestorFrame, aFrame,
                                          aCommonAncestor);
}

// static
bool nsLayoutUtils::IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame,
                                            const nsIFrame* aFrame,
                                            const nsIFrame* aCommonAncestor) {
  for (const nsIFrame* f = aFrame; f != aCommonAncestor;
       f = GetCrossDocParentFrameInProcess(f)) {
    if (f == aAncestorFrame) {
      return true;
    }
  }
  return aCommonAncestor == aAncestorFrame;
}

// static
bool nsLayoutUtils::IsAncestorFrameCrossDocInProcess(
    const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
    const nsIFrame* aCommonAncestor) {
  for (const nsIFrame* f = aFrame; f != aCommonAncestor;
       f = GetCrossDocParentFrameInProcess(f)) {
    if (f == aAncestorFrame) {
      return true;
    }
  }
  return aCommonAncestor == aAncestorFrame;
}

// static
bool nsLayoutUtils::IsProperAncestorFrame(const nsIFrame* aAncestorFrame,
                                          const nsIFrame* aFrame,
                                          const nsIFrame* aCommonAncestor) {
  if (aFrame == aAncestorFrame) {
    return false;
  }
  for (const nsIFrame* f = aFrame; f != aCommonAncestor; f = f->GetParent()) {
    if (f == aAncestorFrame) {
      return true;
    }
  }
  return aCommonAncestor == aAncestorFrame;
}

// static
nsIFrame* nsLayoutUtils::FillAncestors(nsIFrame* aFrame,
                                       nsIFrame* aStopAtAncestor,
                                       nsTArray<nsIFrame*>* aAncestors) {
  while (aFrame && aFrame != aStopAtAncestor) {
    aAncestors->AppendElement(aFrame);
    aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
  }
  return aFrame;
}

// Return true if aFrame1 is after aFrame2
static bool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2) {
  nsIFrame* f = aFrame2;
  do {
    f = f->GetNextSibling();
    if (f == aFrame1) {
      return true;
    }
  } while (f);
  return false;
}

// static
int32_t nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
                                             nsIFrame* aFrame2,
                                             nsIFrame* aCommonAncestor) {
  MOZ_ASSERT(aFrame1, "aFrame1 must not be null");
  MOZ_ASSERT(aFrame2, "aFrame2 must not be null");

  AutoTArray<nsIFrame*, 20> frame2Ancestors;
  nsIFrame* nonCommonAncestor =
      FillAncestors(aFrame2, aCommonAncestor, &frame2Ancestors);
  return DoCompareTreePosition(aFrame1, aFrame2, frame2Ancestors,
                               nonCommonAncestor ? aCommonAncestor : nullptr);
}

// static
int32_t nsLayoutUtils::DoCompareTreePosition(
    nsIFrame* aFrame1, nsIFrame* aFrame2, nsTArray<nsIFrame*>& aFrame2Ancestors,
    nsIFrame* aCommonAncestor) {
  MOZ_ASSERT(aFrame1, "aFrame1 must not be null");
  MOZ_ASSERT(aFrame2, "aFrame2 must not be null");

  nsPresContext* presContext = aFrame1->PresContext();
  if (presContext != aFrame2->PresContext()) {
    NS_ERROR("no common ancestor at all, different documents");
    return 0;
  }

  AutoTArray<nsIFrame*, 20> frame1Ancestors;
  if (aCommonAncestor &&
      !FillAncestors(aFrame1, aCommonAncestor, &frame1Ancestors)) {
    // We reached the root of the frame tree ... if aCommonAncestor was set,
    // it is wrong
    return DoCompareTreePosition(aFrame1, aFrame2, nullptr);
  }

  int32_t last1 = int32_t(frame1Ancestors.Length()) - 1;
  int32_t last2 = int32_t(aFrame2Ancestors.Length()) - 1;
  while (last1 >= 0 && last2 >= 0 &&
         frame1Ancestors[last1] == aFrame2Ancestors[last2]) {
    last1--;
    last2--;
  }

  if (last1 < 0) {
    if (last2 < 0) {
      NS_ASSERTION(aFrame1 == aFrame2, "internal error?");
      return 0;
    }
    // aFrame1 is an ancestor of aFrame2
    return -1;
  }

  if (last2 < 0) {
    // aFrame2 is an ancestor of aFrame1
    return 1;
  }

  nsIFrame* ancestor1 = frame1Ancestors[last1];
  nsIFrame* ancestor2 = aFrame2Ancestors[last2];
  // Now we should be able to walk sibling chains to find which one is first
  if (IsFrameAfter(ancestor2, ancestor1)) {
    return -1;
  }
  if (IsFrameAfter(ancestor1, ancestor2)) {
    return 1;
  }
  NS_WARNING("Frames were in different child lists???");
  return 0;
}

// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
  if (!aFrame) {
    return nullptr;
  }

  nsIFrame* next;
  while ((next = aFrame->GetNextSibling()) != nullptr) {
    aFrame = next;
  }
  return aFrame;
}

// static
nsView* nsLayoutUtils::FindSiblingViewFor(nsView* aParentView,
                                          nsIFrame* aFrame) {
  nsIFrame* parentViewFrame = aParentView->GetFrame();
  nsIContent* parentViewContent =
      parentViewFrame ? parentViewFrame->GetContent() : nullptr;
  for (nsView* insertBefore = aParentView->GetFirstChild(); insertBefore;
       insertBefore = insertBefore->GetNextSibling()) {
    nsIFrame* f = insertBefore->GetFrame();
    if (!f) {
      // this view could be some anonymous view attached to a meaningful parent
      for (nsView* searchView = insertBefore->GetParent(); searchView;
           searchView = searchView->GetParent()) {
        f = searchView->GetFrame();
        if (f) {
          break;
        }
      }
      NS_ASSERTION(f, "Can't find a frame anywhere!");
    }
    if (!f || !aFrame->GetContent() || !f->GetContent() ||
        nsContentUtils::CompareTreePosition<TreeKind::Flat>(
            aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
      // aFrame's content is after f's content (or we just don't know),
      // so put our view before f's view
      return insertBefore;
    }
  }
  return nullptr;
}

// static
ScrollContainerFrame* nsLayoutUtils::GetScrollContainerFrameFor(
    const nsIFrame* aScrolledFrame) {
  nsIFrame* frame = aScrolledFrame->GetParent();
  ScrollContainerFrame* sf = do_QueryFrame(frame);
  return (sf && sf->GetScrolledFrame() == aScrolledFrame) ? sf : nullptr;
}

/* static */
SideBits nsLayoutUtils::GetSideBitsForFixedPositionContent(
    const nsIFrame* aFixedPosFrame) {
  SideBits sides = SideBits::eNone;
  if (aFixedPosFrame) {
    const nsStylePosition* position = aFixedPosFrame->StylePosition();
    if (!position
             ->GetAnchorResolvedInset(eSideRight, StylePositionProperty::Fixed)
             .IsAuto()) {
      sides |= SideBits::eRight;
    }
    if (!position
             ->GetAnchorResolvedInset(eSideLeft, StylePositionProperty::Fixed)
             .IsAuto()) {
      sides |= SideBits::eLeft;
    }
    if (!position
             ->GetAnchorResolvedInset(eSideBottom, StylePositionProperty::Fixed)
             .IsAuto()) {
      sides |= SideBits::eBottom;
    }
    if (!position
             ->GetAnchorResolvedInset(eSideTop, StylePositionProperty::Fixed)
             .IsAuto()) {
      sides |= SideBits::eTop;
    }
  }
  return sides;
}

ScrollableLayerGuid::ViewID nsLayoutUtils::ScrollIdForRootScrollFrame(
    nsPresContext* aPresContext) {
  ViewID id = ScrollableLayerGuid::NULL_SCROLL_ID;
  if (nsIFrame* rootScrollFrame =
          aPresContext->PresShell()->GetRootScrollContainerFrame()) {
    if (nsIContent* content = rootScrollFrame->GetContent()) {
      id = FindOrCreateIDFor(content);
    }
  }
  return id;
}

// static
ScrollContainerFrame* nsLayoutUtils::GetNearestScrollableFrameForDirection(
    nsIFrame* aFrame, ScrollDirections aDirections) {
  NS_ASSERTION(
      aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
  // FIXME Bug 1714720 : This nearest scroll target is not going to work over
  // process boundaries, in such cases we need to hand over in APZ side.
  for (nsIFrame* f = aFrame; f;
       f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
    ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(f);
    if (scrollContainerFrame) {
      ScrollDirections directions =
          scrollContainerFrame
              ->GetAvailableScrollingDirectionsForUserInputEvents();
      if (aDirections.contains(ScrollDirection::eVertical)) {
        if (directions.contains(ScrollDirection::eVertical)) {
          return scrollContainerFrame;
        }
      }
      if (aDirections.contains(ScrollDirection::eHorizontal)) {
        if (directions.contains(ScrollDirection::eHorizontal)) {
          return scrollContainerFrame;
        }
      }
    }
  }
  return nullptr;
}

static nsIFrame* GetNearestScrollableOrOverflowClipFrame(
    nsIFrame* aFrame, uint32_t aFlags,
    const std::function<bool(const nsIFrame* aCurrentFrame)>& aClipFrameCheck =
        nullptr) {
  MOZ_ASSERT(
      aFrame,
      "GetNearestScrollableOrOverflowClipFrame expects a non-null frame");

  auto GetNextFrame = [aFlags](const nsIFrame* aFrame) -> nsIFrame* {
    return (aFlags & nsLayoutUtils::SCROLLABLE_SAME_DOC)
               ? aFrame->GetParent()
               : nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
  };

  for (nsIFrame* f = aFrame; f; f = GetNextFrame(f)) {
    if (aClipFrameCheck && aClipFrameCheck(f)) {
      return f;
    }

    if ((aFlags & nsLayoutUtils::SCROLLABLE_STOP_AT_PAGE) && f->IsPageFrame()) {
      break;
    }

    // TODO: We should also stop at popup frames other than
    // SCROLLABLE_ONLY_ASYNC_SCROLLABLE cases.
    if ((aFlags & nsLayoutUtils::SCROLLABLE_ONLY_ASYNC_SCROLLABLE) &&
        f->IsMenuPopupFrame()) {
      break;
    }

    if (ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(f)) {
      if (aFlags & nsLayoutUtils::SCROLLABLE_ONLY_ASYNC_SCROLLABLE) {
        if (scrollContainerFrame->WantAsyncScroll()) {
          return f;
        }
      } else {
        ScrollStyles ss = scrollContainerFrame->GetScrollStyles();
        if ((aFlags & nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN) ||
            ss.mVertical != StyleOverflow::Hidden ||
            ss.mHorizontal != StyleOverflow::Hidden) {
          return f;
        }
      }
      if (aFlags & nsLayoutUtils::SCROLLABLE_ALWAYS_MATCH_ROOT) {
        PresShell* presShell = f->PresShell();
        if (presShell->GetRootScrollContainerFrame() == f &&
            presShell->GetDocument() &&
            presShell->GetDocument()->IsRootDisplayDocument()) {
          return f;
        }
      }
    }
    if ((aFlags & nsLayoutUtils::SCROLLABLE_FIXEDPOS_FINDS_ROOT) &&
        f->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
        nsLayoutUtils::IsReallyFixedPos(f)) {
      return f->PresShell()->GetRootScrollContainerFrame();
    }
  }
  return nullptr;
}

// static
ScrollContainerFrame* nsLayoutUtils::GetNearestScrollContainerFrame(
    nsIFrame* aFrame, uint32_t aFlags) {
  nsIFrame* found = GetNearestScrollableOrOverflowClipFrame(aFrame, aFlags);
  if (!found) {
    return nullptr;
  }

  return do_QueryFrame(found);
}

// static
nsIFrame* nsLayoutUtils::GetNearestOverflowClipFrame(nsIFrame* aFrame) {
  return GetNearestScrollableOrOverflowClipFrame(
      aFrame, SCROLLABLE_SAME_DOC | SCROLLABLE_INCLUDE_HIDDEN,
      [](const nsIFrame* currentFrame) -> bool {
        // In cases of SVG Inner/Outer frames it basically clips descendants
        // unless overflow: visible is explicitly specified.
        LayoutFrameType type = currentFrame->Type();
        return ((type == LayoutFrameType::SVGOuterSVG ||
                 type == LayoutFrameType::SVGInnerSVG) &&
                (currentFrame->StyleDisplay()->mOverflowX !=
                     StyleOverflow::Visible &&
                 currentFrame->StyleDisplay()->mOverflowY !=
                     StyleOverflow::Visible));
      });
}

// static
bool nsLayoutUtils::HasPseudoStyle(nsIContent* aContent,
                                   ComputedStyle* aComputedStyle,
                                   PseudoStyleType aPseudoElement,
                                   nsPresContext* aPresContext) {
  MOZ_ASSERT(aPresContext, "Must have a prescontext");

  RefPtr<ComputedStyle> pseudoContext;
  if (aContent) {
    pseudoContext = aPresContext->StyleSet()->ProbePseudoElementStyle(
        *aContent->AsElement(), aPseudoElement, nullptr, aComputedStyle);
  }
  return pseudoContext != nullptr;
}

nsPoint nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(Event* aDOMEvent,
                                                        nsIFrame* aFrame) {
  if (!aDOMEvent) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }
  WidgetEvent* event = aDOMEvent->WidgetEventPtr();
  if (!event) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }
  return GetEventCoordinatesRelativeTo(event, RelativeTo{aFrame});
}

static bool IsValidCoordinateTypeEvent(const WidgetEvent* aEvent) {
  if (!aEvent) {
    return false;
  }
  return aEvent->mClass == eMouseEventClass ||
         aEvent->mClass == eMouseScrollEventClass ||
         aEvent->mClass == eWheelEventClass ||
         aEvent->mClass == eDragEventClass ||
         aEvent->mClass == eSimpleGestureEventClass ||
         aEvent->mClass == ePointerEventClass ||
         aEvent->mClass == eGestureNotifyEventClass ||
         aEvent->mClass == eTouchEventClass ||
         aEvent->mClass == eQueryContentEventClass;
}

nsPoint nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
                                                     RelativeTo aFrame) {
  if (!IsValidCoordinateTypeEvent(aEvent)) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  return GetEventCoordinatesRelativeTo(aEvent, aEvent->AsGUIEvent()->mRefPoint,
                                       aFrame);
}

nsPoint nsLayoutUtils::GetEventCoordinatesRelativeTo(
    const WidgetEvent* aEvent, const LayoutDeviceIntPoint& aPoint,
    RelativeTo aFrame) {
  if (!aFrame.mFrame) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  nsIWidget* widget = aEvent->AsGUIEvent()->mWidget;
  if (!widget) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  return GetEventCoordinatesRelativeTo(widget, aPoint, aFrame);
}

nsPoint GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
                                      const LayoutDeviceIntPoint& aPoint,
                                      RelativeTo aFrame) {
  const nsIFrame* frame = aFrame.mFrame;
  if (!frame || !aWidget) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  nsView* view = frame->GetView();
  if (view) {
    nsIWidget* frameWidget = view->GetWidget();
    if (frameWidget && frameWidget == aWidget) {
      // Special case this cause it happens a lot.
      // This also fixes bug 664707, events in the extra-special case of select
      // dropdown popups that are transformed.
      nsPresContext* presContext = frame->PresContext();
      nsPoint pt(presContext->DevPixelsToAppUnits(aPoint.x),
                 presContext->DevPixelsToAppUnits(aPoint.y));
      return pt - view->ViewToWidgetOffset();
    }
  }

  /* If we walk up the frame tree and discover that any of the frames are
   * transformed, we need to do extra work to convert from the global
   * space to the local space.
   */
  const nsIFrame* rootFrame = frame;
  bool transformFound = false;
  for (const nsIFrame* f = frame; f;
       f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
    if (f->IsTransformed() || ViewportUtils::IsZoomedContentRoot(f)) {
      transformFound = true;
    }

    rootFrame = f;
  }

  nsView* rootView = rootFrame->GetView();
  if (!rootView) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  nsPoint widgetToView = nsLayoutUtils::TranslateWidgetToView(
      rootFrame->PresContext(), aWidget, aPoint, rootView);

  if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
    return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
  }

  // Convert from root document app units to app units of the document aFrame
  // is in.
  int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
  int32_t localAPD = frame->PresContext()->AppUnitsPerDevPixel();
  widgetToView = widgetToView.ScaleToOtherAppUnits(rootAPD, localAPD);

  /* If we encountered a transform, we can't do simple arithmetic to figure
   * out how to convert back to aFrame's coordinates and must use the CTM.
   */
  if (transformFound || frame->IsInSVGTextSubtree()) {
    return nsLayoutUtils::TransformRootPointToFrame(ViewportType::Visual,
                                                    aFrame, widgetToView);
  }

  /* Otherwise, all coordinate systems are translations of one another,
   * so we can just subtract out the difference.
   */
  return widgetToView - frame->GetOffsetToCrossDoc(rootFrame);
}

nsPoint nsLayoutUtils::GetEventCoordinatesRelativeTo(
    nsIWidget* aWidget, const LayoutDeviceIntPoint& aPoint, RelativeTo aFrame) {
  nsPoint result = ::GetEventCoordinatesRelativeTo(aWidget, aPoint, aFrame);
  if (aFrame.mViewportType == ViewportType::Layout && aFrame.mFrame &&
      aFrame.mFrame->Type() == LayoutFrameType::Viewport &&
      aFrame.mFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
    result = ViewportUtils::VisualToLayout(result, aFrame.mFrame->PresShell());
  }
  return result;
}

nsIFrame* nsLayoutUtils::GetPopupFrameForEventCoordinates(
    nsPresContext* aRootPresContext, const WidgetEvent* aEvent) {
  if (!IsValidCoordinateTypeEvent(aEvent)) {
    return nullptr;
  }

  const auto* guiEvent = aEvent->AsGUIEvent();
  return GetPopupFrameForPoint(aRootPresContext, guiEvent->mWidget,
                               guiEvent->mRefPoint);
}

nsIFrame* nsLayoutUtils::GetPopupFrameForPoint(
    nsPresContext* aRootPresContext, nsIWidget* aWidget,
    const mozilla::LayoutDeviceIntPoint& aPoint,
    GetPopupFrameForPointFlags aFlags /* = GetPopupFrameForPointFlags(0) */) {
  nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
  if (!pm) {
    return nullptr;
  }
  nsTArray<nsMenuPopupFrame*> popups;
  pm->GetVisiblePopups(popups);
  // Search from top to bottom
  for (nsMenuPopupFrame* popup : popups) {
    if (popup->PresContext()->GetRootPresContext() != aRootPresContext) {
      continue;
    }
    if (!popup->ScrollableOverflowRect().Contains(GetEventCoordinatesRelativeTo(
            aWidget, aPoint, RelativeTo{popup}))) {
      continue;
    }
    if (aFlags & GetPopupFrameForPointFlags::OnlyReturnFramesWithWidgets) {
      if (!popup->HasView() || !popup->GetView()->HasWidget()) {
        continue;
      }
    }
    return popup;
  }
  return nullptr;
}

void nsLayoutUtils::GetContainerAndOffsetAtEvent(PresShell* aPresShell,
                                                 const WidgetEvent* aEvent,
                                                 nsIContent** aContainer,
                                                 int32_t* aOffset) {
  MOZ_ASSERT(aContainer || aOffset);

  if (aContainer) {
    *aContainer = nullptr;
  }
  if (aOffset) {
    *aOffset = 0;
  }

  if (!aPresShell) {
    return;
  }

  aPresShell->FlushPendingNotifications(FlushType::Layout);

  RefPtr<nsPresContext> presContext = aPresShell->GetPresContext();
  if (!presContext) {
    return;
  }

  nsIFrame* targetFrame = presContext->EventStateManager()->GetEventTarget();
  if (!targetFrame) {
    return;
  }

  WidgetEvent* openingEvent = nullptr;
  // For popupshowing events, redirect via the original mouse event
  // that triggered the popup to open.
  if (aEvent->mMessage == eXULPopupShowing) {
    if (auto* pm = nsXULPopupManager::GetInstance()) {
      if (Event* openingPopupEvent = pm->GetOpeningPopupEvent()) {
        openingEvent = openingPopupEvent->WidgetEventPtr();
      }
    }
  }

  nsPoint point = nsLayoutUtils::GetEventCoordinatesRelativeTo(
      openingEvent ? openingEvent : aEvent, RelativeTo{targetFrame});

  if (aContainer) {
    // TODO: This result may be useful to change to Selection.  However, this
    //       may return improper node (e.g., native anonymous node) for the
    //       Selection.  Perhaps, this should take Selection optionally and
    //       if it's specified, needs to check if it's proper for the
    //       Selection.
    nsCOMPtr<nsIContent> container =
        targetFrame->GetContentOffsetsFromPoint(point).content;
    if (container && (!container->ChromeOnlyAccess() ||
                      nsContentUtils::CanAccessNativeAnon())) {
      container.forget(aContainer);
    }
  }
  if (aOffset) {
    *aOffset = targetFrame->GetContentOffsetsFromPoint(point).offset;
  }
}

void nsLayoutUtils::ConstrainToCoordValues(float& aStart, float& aSize) {
  MOZ_ASSERT(aSize >= 0);

  // Here we try to make sure that the resulting nsRect will continue to cover
  // as much of the area that was covered by the original gfx Rect as possible.

  // We clamp the bounds of the rect to {nscoord_MIN,nscoord_MAX} since
  // nsRect::X/Y() and nsRect::XMost/YMost() can't return values outwith this
  // range:
  float end = aStart + aSize;
  aStart = std::clamp(aStart, float(nscoord_MIN), float(nscoord_MAX));
  end = std::clamp(end, float(nscoord_MIN), float(nscoord_MAX));

  aSize = end - aStart;

  // We must also clamp aSize to {0,nscoord_MAX} since nsRect::Width/Height()
  // can't return a value greater than nscoord_MAX. If aSize is greater than
  // nscoord_MAX then we reduce it to nscoord_MAX while keeping the rect
  // centered:
  if (MOZ_UNLIKELY(std::isnan(aSize))) {
    // Can happen if aStart is -inf and aSize is +inf for example.
    aStart = 0.0f;
    aSize = float(nscoord_MAX);
  } else if (aSize > float(nscoord_MAX)) {
    float excess = aSize - float(nscoord_MAX);
    excess /= 2;
    aStart += excess;
    aSize = float(nscoord_MAX);
  }
}

/**
* Given a gfxFloat, constrains its value to be between nscoord_MIN and
* nscoord_MAX.
*
* @param aVal The value to constrain (in/out)
*/
static void ConstrainToCoordValues(gfxFloat& aVal) {
  if (aVal <= nscoord_MIN) {
    aVal = nscoord_MIN;
  } else if (aVal >= nscoord_MAX) {
    aVal = nscoord_MAX;
  }
}

void nsLayoutUtils::ConstrainToCoordValues(gfxFloat& aStart, gfxFloat& aSize) {
  gfxFloat max = aStart + aSize;

  // Clamp the end points to within nscoord range
  ::ConstrainToCoordValues(aStart);
  ::ConstrainToCoordValues(max);

  aSize = max - aStart;
  // If the width if still greater than the max nscoord, then bring both
  // endpoints in by the same amount until it fits.
  if (MOZ_UNLIKELY(std::isnan(aSize))) {
    // Can happen if aStart is -inf and aSize is +inf for example.
    aStart = 0.0f;
    aSize = nscoord_MAX;
  } else if (aSize > nscoord_MAX) {
    gfxFloat excess = aSize - nscoord_MAX;
    excess /= 2;

    aStart += excess;
    aSize = nscoord_MAX;
  } else if (aSize < nscoord_MIN) {
    gfxFloat excess = aSize - nscoord_MIN;
    excess /= 2;

    aStart -= excess;
    aSize = nscoord_MIN;
  }
}

nsRegion nsLayoutUtils::RoundedRectIntersectRect(const nsRect& aRoundedRect,
                                                 const nscoord aRadii[8],
                                                 const nsRect& aContainedRect) {
  // rectFullHeight and rectFullWidth together will approximately contain
  // the total area of the frame minus the rounded corners.
  nsRect rectFullHeight = aRoundedRect;
  nscoord xDiff = std::max(aRadii[eCornerTopLeftX], aRadii[eCornerBottomLeftX]);
  rectFullHeight.x += xDiff;
  rectFullHeight.width -=
      std::max(aRadii[eCornerTopRightX], aRadii[eCornerBottomRightX]) + xDiff;
  nsRect r1;
  r1.IntersectRect(rectFullHeight, aContainedRect);

  nsRect rectFullWidth = aRoundedRect;
  nscoord yDiff = std::max(aRadii[eCornerTopLeftY], aRadii[eCornerTopRightY]);
  rectFullWidth.y += yDiff;
  rectFullWidth.height -=
      std::max(aRadii[eCornerBottomLeftY], aRadii[eCornerBottomRightY]) + yDiff;
  nsRect r2;
  r2.IntersectRect(rectFullWidth, aContainedRect);

  nsRegion result;
  result.Or(r1, r2);
  return result;
}

nsIntRegion nsLayoutUtils::RoundedRectIntersectIntRect(
    const nsIntRect& aRoundedRect, const RectCornerRadii& aCornerRadii,
    const nsIntRect& aContainedRect) {
  // rectFullHeight and rectFullWidth together will approximately contain
  // the total area of the frame minus the rounded corners.
  nsIntRect rectFullHeight = aRoundedRect;
  uint32_t xDiff =
      std::max(aCornerRadii.TopLeft().width, aCornerRadii.BottomLeft().width);
  rectFullHeight.x += xDiff;
  rectFullHeight.width -= std::max(aCornerRadii.TopRight().width,
                                   aCornerRadii.BottomRight().width) +
                          xDiff;
  nsIntRect r1;
  r1.IntersectRect(rectFullHeight, aContainedRect);

  nsIntRect rectFullWidth = aRoundedRect;
  uint32_t yDiff =
      std::max(aCornerRadii.TopLeft().height, aCornerRadii.TopRight().height);
  rectFullWidth.y += yDiff;
  rectFullWidth.height -= std::max(aCornerRadii.BottomLeft().height,
                                   aCornerRadii.BottomRight().height) +
                          yDiff;
  nsIntRect r2;
  r2.IntersectRect(rectFullWidth, aContainedRect);

  nsIntRegion result;
  result.Or(r1, r2);
  return result;
}

// Helper for RoundedRectIntersectsRect.
static bool CheckCorner(nscoord aXOffset, nscoord aYOffset, nscoord aXRadius,
                        nscoord aYRadius) {
  MOZ_ASSERT(aXOffset > 0 && aYOffset > 0,
             "must not pass nonpositives to CheckCorner");
  MOZ_ASSERT(aXRadius >= 0 && aYRadius >= 0,
             "must not pass negatives to CheckCorner");

  // Avoid floating point math unless we're either (1) within the
  // quarter-ellipse area at the rounded corner or (2) outside the
  // rounding.
  if (aXOffset >= aXRadius || aYOffset >= aYRadius) {
    return true;
  }

  // Convert coordinates to a unit circle with (0,0) as the center of
  // curvature, and see if we're inside the circle or outside.
  float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
  float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
  return scaledX * scaledX + scaledY * scaledY < 1.0f;
}

bool nsLayoutUtils::RoundedRectIntersectsRect(const nsRect& aRoundedRect,
                                              const nscoord aRadii[8],
                                              const nsRect& aTestRect) {
  if (!aTestRect.Intersects(aRoundedRect)) {
    return false;
  }

  // distances from this edge of aRoundedRect to opposite edge of aTestRect,
  // which we know are positive due to the Intersects check above.
  nsMargin insets;
  insets.top = aTestRect.YMost() - aRoundedRect.y;
  insets.right = aRoundedRect.XMost() - aTestRect.x;
  insets.bottom = aRoundedRect.YMost() - aTestRect.y;
  insets.left = aTestRect.XMost() - aRoundedRect.x;

  // Check whether the bottom-right corner of aTestRect is inside the
  // top left corner of aBounds when rounded by aRadii, etc.  If any
  // corner is not, then fail; otherwise succeed.
  return CheckCorner(insets.left, insets.top, aRadii[eCornerTopLeftX],
                     aRadii[eCornerTopLeftY]) &&
         CheckCorner(insets.right, insets.top, aRadii[eCornerTopRightX],
                     aRadii[eCornerTopRightY]) &&
         CheckCorner(insets.right, insets.bottom, aRadii[eCornerBottomRightX],
                     aRadii[eCornerBottomRightY]) &&
         CheckCorner(insets.left, insets.bottom, aRadii[eCornerBottomLeftX],
                     aRadii[eCornerBottomLeftY]);
}

nsRect nsLayoutUtils::MatrixTransformRect(const nsRect& aBounds,
                                          const Matrix4x4& aMatrix,
                                          float aFactor) {
  RectDouble image =
      RectDouble(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.y, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.width, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.height, aFactor));

  RectDouble maxBounds = RectDouble(
      double(nscoord_MIN) / aFactor * 0.5, double(nscoord_MIN) / aFactor * 0.5,
      double(nscoord_MAX) / aFactor, double(nscoord_MAX) / aFactor);

  image = aMatrix.TransformAndClipBounds(image, maxBounds);

  return RoundGfxRectToAppRect(ThebesRect(image), aFactor);
}

nsRect nsLayoutUtils::MatrixTransformRect(const nsRect& aBounds,
                                          const Matrix4x4Flagged& aMatrix,
                                          float aFactor) {
  RectDouble image =
      RectDouble(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.y, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.width, aFactor),
                 NSAppUnitsToDoublePixels(aBounds.height, aFactor));

  RectDouble maxBounds = RectDouble(
      double(nscoord_MIN) / aFactor * 0.5, double(nscoord_MIN) / aFactor * 0.5,
      double(nscoord_MAX) / aFactor, double(nscoord_MAX) / aFactor);

  image = aMatrix.TransformAndClipBounds(image, maxBounds);

  return RoundGfxRectToAppRect(ThebesRect(image), aFactor);
}

nsPoint nsLayoutUtils::MatrixTransformPoint(const nsPoint& aPoint,
                                            const Matrix4x4& aMatrix,
                                            float aFactor) {
  gfxPoint image = gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, aFactor),
                            NSAppUnitsToFloatPixels(aPoint.y, aFactor));
  image = aMatrix.TransformPoint(image);
  return nsPoint(NSFloatPixelsToAppUnits(float(image.x), aFactor),
                 NSFloatPixelsToAppUnits(float(image.y), aFactor));
}

void nsLayoutUtils::PostTranslate(Matrix4x4& aTransform, const nsPoint& aOrigin,
                                  float aAppUnitsPerPixel, bool aRounded) {
  Point3D gfxOrigin =
      Point3D(NSAppUnitsToFloatPixels(aOrigin.x, aAppUnitsPerPixel),
              NSAppUnitsToFloatPixels(aOrigin.y, aAppUnitsPerPixel), 0.0f);
  if (aRounded) {
    gfxOrigin.x = NS_round(gfxOrigin.x);
    gfxOrigin.y = NS_round(gfxOrigin.y);
  }
  aTransform.PostTranslate(gfxOrigin);
}

bool nsLayoutUtils::ShouldSnapToGrid(const nsIFrame* aFrame) {
  return !aFrame || !aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT) ||
         aFrame->IsSVGOuterSVGAnonChildFrame();
}

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