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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/layers/LayerTreeInvalidation.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/layers/LayerTreeInvalidation.cpp')
-rw-r--r--gfx/layers/LayerTreeInvalidation.cpp679
1 files changed, 679 insertions, 0 deletions
diff --git a/gfx/layers/LayerTreeInvalidation.cpp b/gfx/layers/LayerTreeInvalidation.cpp
new file mode 100644
index 000000000..5604fafee
--- /dev/null
+++ b/gfx/layers/LayerTreeInvalidation.cpp
@@ -0,0 +1,679 @@
+/*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "LayerTreeInvalidation.h"
+
+#include <stdint.h> // for uint32_t
+#include "ImageContainer.h" // for ImageContainer
+#include "ImageLayers.h" // for ImageLayer, etc
+#include "Layers.h" // for Layer, ContainerLayer, etc
+#include "Units.h" // for ParentLayerIntRect
+#include "gfxRect.h" // for gfxRect
+#include "gfxUtils.h" // for gfxUtils
+#include "mozilla/gfx/BaseSize.h" // for BaseSize
+#include "mozilla/gfx/Point.h" // for IntSize
+#include "mozilla/mozalloc.h" // for operator new, etc
+#include "nsDataHashtable.h" // for nsDataHashtable
+#include "nsDebug.h" // for NS_ASSERTION
+#include "nsHashKeys.h" // for nsPtrHashKey
+#include "nsISupportsImpl.h" // for Layer::AddRef, etc
+#include "nsRect.h" // for IntRect
+#include "nsTArray.h" // for AutoTArray, nsTArray_Impl
+#include "mozilla/Poison.h"
+#include "mozilla/layers/ImageHost.h"
+#include "mozilla/layers/LayerManagerComposite.h"
+#include "TreeTraversal.h" // for ForEachNode
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace layers {
+
+struct LayerPropertiesBase;
+UniquePtr<LayerPropertiesBase> CloneLayerTreePropertiesInternal(Layer* aRoot, bool aIsMask = false);
+
+/**
+ * Get accumulated transform of from the context creating layer to the
+ * given layer.
+ */
+static Matrix4x4
+GetTransformIn3DContext(Layer* aLayer) {
+ Matrix4x4 transform = aLayer->GetLocalTransform();
+ for (Layer* layer = aLayer->GetParent();
+ layer && layer->Extend3DContext();
+ layer = layer->GetParent()) {
+ transform = transform * layer->GetLocalTransform();
+ }
+ return transform;
+}
+
+/**
+ * Get a transform for the given layer depending on extending 3D
+ * context.
+ *
+ * @return local transform for layers not participating 3D rendering
+ * context, or the accmulated transform in the context for else.
+ */
+static Matrix4x4
+GetTransformForInvalidation(Layer* aLayer) {
+ return (!aLayer->Is3DContextLeaf() && !aLayer->Extend3DContext() ?
+ aLayer->GetLocalTransform() : GetTransformIn3DContext(aLayer));
+}
+
+static IntRect
+TransformRect(const IntRect& aRect, const Matrix4x4& aTransform)
+{
+ if (aRect.IsEmpty()) {
+ return IntRect();
+ }
+
+ Rect rect(aRect.x, aRect.y, aRect.width, aRect.height);
+ rect = aTransform.TransformAndClipBounds(rect, Rect::MaxIntRect());
+ rect.RoundOut();
+
+ IntRect intRect;
+ if (!gfxUtils::GfxRectToIntRect(ThebesRect(rect), &intRect)) {
+ return IntRect();
+ }
+
+ return intRect;
+}
+
+static void
+AddTransformedRegion(nsIntRegion& aDest, const nsIntRegion& aSource, const Matrix4x4& aTransform)
+{
+ for (auto iter = aSource.RectIter(); !iter.Done(); iter.Next()) {
+ aDest.Or(aDest, TransformRect(iter.Get(), aTransform));
+ }
+ aDest.SimplifyOutward(20);
+}
+
+static void
+AddRegion(nsIntRegion& aDest, const nsIntRegion& aSource)
+{
+ aDest.Or(aDest, aSource);
+ aDest.SimplifyOutward(20);
+}
+
+/**
+ * Walks over this layer, and all descendant layers.
+ * If any of these are a ContainerLayer that reports invalidations to a PresShell,
+ * then report that the entire bounds have changed.
+ */
+static void
+NotifySubdocumentInvalidation(Layer* aLayer, NotifySubDocInvalidationFunc aCallback)
+{
+ ForEachNode<ForwardIterator>(
+ aLayer,
+ [aCallback] (Layer* layer)
+ {
+ layer->ClearInvalidRect();
+ if (layer->GetMaskLayer()) {
+ NotifySubdocumentInvalidation(layer->GetMaskLayer(), aCallback);
+ }
+ for (size_t i = 0; i < layer->GetAncestorMaskLayerCount(); i++) {
+ Layer* maskLayer = layer->GetAncestorMaskLayerAt(i);
+ NotifySubdocumentInvalidation(maskLayer, aCallback);
+ }
+ },
+ [aCallback] (Layer* layer)
+ {
+ ContainerLayer* container = layer->AsContainerLayer();
+ if (container) {
+ aCallback(container, container->GetLocalVisibleRegion().ToUnknownRegion());
+ }
+ });
+}
+
+struct LayerPropertiesBase : public LayerProperties
+{
+ explicit LayerPropertiesBase(Layer* aLayer)
+ : mLayer(aLayer)
+ , mMaskLayer(nullptr)
+ , mVisibleRegion(mLayer->GetLocalVisibleRegion().ToUnknownRegion())
+ , mPostXScale(aLayer->GetPostXScale())
+ , mPostYScale(aLayer->GetPostYScale())
+ , mOpacity(aLayer->GetLocalOpacity())
+ , mUseClipRect(!!aLayer->GetLocalClipRect())
+ {
+ MOZ_COUNT_CTOR(LayerPropertiesBase);
+ if (aLayer->GetMaskLayer()) {
+ mMaskLayer = CloneLayerTreePropertiesInternal(aLayer->GetMaskLayer(), true);
+ }
+ for (size_t i = 0; i < aLayer->GetAncestorMaskLayerCount(); i++) {
+ Layer* maskLayer = aLayer->GetAncestorMaskLayerAt(i);
+ mAncestorMaskLayers.AppendElement(CloneLayerTreePropertiesInternal(maskLayer, true));
+ }
+ if (mUseClipRect) {
+ mClipRect = *aLayer->GetLocalClipRect();
+ }
+ mTransform = GetTransformForInvalidation(aLayer);
+ }
+ LayerPropertiesBase()
+ : mLayer(nullptr)
+ , mMaskLayer(nullptr)
+ {
+ MOZ_COUNT_CTOR(LayerPropertiesBase);
+ }
+ ~LayerPropertiesBase()
+ {
+ MOZ_COUNT_DTOR(LayerPropertiesBase);
+ }
+
+protected:
+ LayerPropertiesBase(const LayerPropertiesBase& a) = delete;
+ LayerPropertiesBase& operator=(const LayerPropertiesBase& a) = delete;
+
+public:
+ virtual nsIntRegion ComputeDifferences(Layer* aRoot,
+ NotifySubDocInvalidationFunc aCallback,
+ bool* aGeometryChanged);
+
+ virtual void MoveBy(const IntPoint& aOffset);
+
+ nsIntRegion ComputeChange(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged)
+ {
+ // Bug 1251615: This canary is sometimes hit. We're still not sure why.
+ mCanary.Check();
+ bool transformChanged = !mTransform.FuzzyEqual(GetTransformForInvalidation(mLayer)) ||
+ mLayer->GetPostXScale() != mPostXScale ||
+ mLayer->GetPostYScale() != mPostYScale;
+ const Maybe<ParentLayerIntRect>& otherClip = mLayer->GetLocalClipRect();
+ nsIntRegion result;
+
+ bool ancestorMaskChanged = mAncestorMaskLayers.Length() != mLayer->GetAncestorMaskLayerCount();
+ if (!ancestorMaskChanged) {
+ for (size_t i = 0; i < mAncestorMaskLayers.Length(); i++) {
+ if (mLayer->GetAncestorMaskLayerAt(i) != mAncestorMaskLayers[i]->mLayer) {
+ ancestorMaskChanged = true;
+ break;
+ }
+ }
+ }
+
+ Layer* otherMask = mLayer->GetMaskLayer();
+ if ((mMaskLayer ? mMaskLayer->mLayer : nullptr) != otherMask ||
+ ancestorMaskChanged ||
+ (mUseClipRect != !!otherClip) ||
+ mLayer->GetLocalOpacity() != mOpacity ||
+ transformChanged)
+ {
+ aGeometryChanged = true;
+ result = OldTransformedBounds();
+ AddRegion(result, NewTransformedBounds());
+
+ // We can't bail out early because we need to update mChildrenChanged.
+ }
+
+ AddRegion(result, ComputeChangeInternal(aCallback, aGeometryChanged));
+ AddTransformedRegion(result, mLayer->GetInvalidRegion().GetRegion(), mTransform);
+
+ if (mMaskLayer && otherMask) {
+ AddTransformedRegion(result, mMaskLayer->ComputeChange(aCallback, aGeometryChanged),
+ mTransform);
+ }
+
+ for (size_t i = 0;
+ i < std::min(mAncestorMaskLayers.Length(), mLayer->GetAncestorMaskLayerCount());
+ i++)
+ {
+ AddTransformedRegion(result,
+ mAncestorMaskLayers[i]->ComputeChange(aCallback, aGeometryChanged),
+ mTransform);
+ }
+
+ if (mUseClipRect && otherClip) {
+ if (!mClipRect.IsEqualInterior(*otherClip)) {
+ aGeometryChanged = true;
+ nsIntRegion tmp;
+ tmp.Xor(mClipRect.ToUnknownRect(), otherClip->ToUnknownRect());
+ AddRegion(result, tmp);
+ }
+ }
+
+ mLayer->ClearInvalidRect();
+ return result;
+ }
+
+ void CheckCanary()
+ {
+ mCanary.Check();
+ mLayer->CheckCanary();
+ }
+
+ virtual IntRect NewTransformedBounds()
+ {
+ return TransformRect(mLayer->GetLocalVisibleRegion().ToUnknownRegion().GetBounds(),
+ GetTransformForInvalidation(mLayer));
+ }
+
+ virtual IntRect OldTransformedBounds()
+ {
+ return TransformRect(mVisibleRegion.ToUnknownRegion().GetBounds(), mTransform);
+ }
+
+ virtual nsIntRegion ComputeChangeInternal(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged)
+ {
+ return IntRect();
+ }
+
+ RefPtr<Layer> mLayer;
+ UniquePtr<LayerPropertiesBase> mMaskLayer;
+ nsTArray<UniquePtr<LayerPropertiesBase>> mAncestorMaskLayers;
+ nsIntRegion mVisibleRegion;
+ Matrix4x4 mTransform;
+ float mPostXScale;
+ float mPostYScale;
+ float mOpacity;
+ ParentLayerIntRect mClipRect;
+ bool mUseClipRect;
+ mozilla::CorruptionCanary mCanary;
+};
+
+struct ContainerLayerProperties : public LayerPropertiesBase
+{
+ explicit ContainerLayerProperties(ContainerLayer* aLayer)
+ : LayerPropertiesBase(aLayer)
+ , mPreXScale(aLayer->GetPreXScale())
+ , mPreYScale(aLayer->GetPreYScale())
+ {
+ for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) {
+ child->CheckCanary();
+ mChildren.AppendElement(Move(CloneLayerTreePropertiesInternal(child)));
+ }
+ }
+
+protected:
+ ContainerLayerProperties(const ContainerLayerProperties& a) = delete;
+ ContainerLayerProperties& operator=(const ContainerLayerProperties& a) = delete;
+
+public:
+ nsIntRegion ComputeChangeInternal(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged) override
+ {
+ // Make sure we got our virtual call right
+ mSubtypeCanary.Check();
+ ContainerLayer* container = mLayer->AsContainerLayer();
+ nsIntRegion invalidOfLayer; // Invalid regions of this layer.
+ nsIntRegion result; // Invliad regions for children only.
+
+ container->CheckCanary();
+
+ bool childrenChanged = false;
+
+ if (mPreXScale != container->GetPreXScale() ||
+ mPreYScale != container->GetPreYScale()) {
+ aGeometryChanged = true;
+ invalidOfLayer = OldTransformedBounds();
+ AddRegion(invalidOfLayer, NewTransformedBounds());
+ childrenChanged = true;
+
+ // Can't bail out early, we need to update the child container layers
+ }
+
+ // A low frame rate is especially visible to users when scrolling, so we
+ // particularly want to avoid unnecessary invalidation at that time. For us
+ // here, that means avoiding unnecessary invalidation of child items when
+ // other children are added to or removed from our container layer, since
+ // that may be caused by children being scrolled in or out of view. We are
+ // less concerned with children changing order.
+ // TODO: Consider how we could avoid unnecessary invalidation when children
+ // change order, and whether the overhead would be worth it.
+
+ nsDataHashtable<nsPtrHashKey<Layer>, uint32_t> oldIndexMap(mChildren.Length());
+ for (uint32_t i = 0; i < mChildren.Length(); ++i) {
+ mChildren[i]->CheckCanary();
+ oldIndexMap.Put(mChildren[i]->mLayer, i);
+ }
+
+ uint32_t i = 0; // cursor into the old child list mChildren
+ for (Layer* child = container->GetFirstChild(); child; child = child->GetNextSibling()) {
+ bool invalidateChildsCurrentArea = false;
+ if (i < mChildren.Length()) {
+ uint32_t childsOldIndex;
+ if (oldIndexMap.Get(child, &childsOldIndex)) {
+ if (childsOldIndex >= i) {
+ // Invalidate the old areas of layers that used to be between the
+ // current |child| and the previous |child| that was also in the
+ // old list mChildren (if any of those children have been reordered
+ // rather than removed, we will invalidate their new area when we
+ // encounter them in the new list):
+ for (uint32_t j = i; j < childsOldIndex; ++j) {
+ AddRegion(result, mChildren[j]->OldTransformedBounds());
+ childrenChanged |= true;
+ }
+ if (childsOldIndex >= mChildren.Length()) {
+ MOZ_CRASH("Out of bounds");
+ }
+ // Invalidate any regions of the child that have changed:
+ nsIntRegion region = mChildren[childsOldIndex]->ComputeChange(aCallback, aGeometryChanged);
+ i = childsOldIndex + 1;
+ if (!region.IsEmpty()) {
+ AddRegion(result, region);
+ childrenChanged |= true;
+ }
+ } else {
+ // We've already seen this child in mChildren (which means it must
+ // have been reordered) and invalidated its old area. We need to
+ // invalidate its new area too:
+ invalidateChildsCurrentArea = true;
+ }
+ } else {
+ // |child| is new
+ invalidateChildsCurrentArea = true;
+ }
+ } else {
+ // |child| is new, or was reordered to a higher index
+ invalidateChildsCurrentArea = true;
+ }
+ if (invalidateChildsCurrentArea) {
+ aGeometryChanged = true;
+ AddTransformedRegion(result, child->GetLocalVisibleRegion().ToUnknownRegion(),
+ GetTransformForInvalidation(child));
+ if (aCallback) {
+ NotifySubdocumentInvalidation(child, aCallback);
+ } else {
+ ClearInvalidations(child);
+ }
+ }
+ childrenChanged |= invalidateChildsCurrentArea;
+ }
+
+ // Process remaining removed children.
+ while (i < mChildren.Length()) {
+ childrenChanged |= true;
+ AddRegion(result, mChildren[i]->OldTransformedBounds());
+ i++;
+ }
+
+ if (aCallback) {
+ aCallback(container, result);
+ }
+
+ if (childrenChanged) {
+ container->SetChildrenChanged(true);
+ }
+
+ if (!mLayer->Extend3DContext()) {
+ // |result| contains invalid regions only of children.
+ result.Transform(GetTransformForInvalidation(mLayer));
+ }
+ // else, effective transforms have applied on children.
+
+ result.OrWith(invalidOfLayer);
+
+ return result;
+ }
+
+ IntRect NewTransformedBounds() override
+ {
+ if (mLayer->Extend3DContext()) {
+ IntRect result;
+ for (UniquePtr<LayerPropertiesBase>& child : mChildren) {
+ result = result.Union(child->NewTransformedBounds());
+ }
+ return result;
+ }
+
+ return LayerPropertiesBase::NewTransformedBounds();
+ }
+
+ IntRect OldTransformedBounds() override
+ {
+ if (mLayer->Extend3DContext()) {
+ IntRect result;
+ for (UniquePtr<LayerPropertiesBase>& child : mChildren) {
+ result = result.Union(child->OldTransformedBounds());
+ }
+ return result;
+ }
+ return LayerPropertiesBase::OldTransformedBounds();
+ }
+
+ // The old list of children:
+ mozilla::CorruptionCanary mSubtypeCanary;
+ nsTArray<UniquePtr<LayerPropertiesBase>> mChildren;
+ float mPreXScale;
+ float mPreYScale;
+};
+
+struct ColorLayerProperties : public LayerPropertiesBase
+{
+ explicit ColorLayerProperties(ColorLayer *aLayer)
+ : LayerPropertiesBase(aLayer)
+ , mColor(aLayer->GetColor())
+ , mBounds(aLayer->GetBounds())
+ { }
+
+protected:
+ ColorLayerProperties(const ColorLayerProperties& a) = delete;
+ ColorLayerProperties& operator=(const ColorLayerProperties& a) = delete;
+
+public:
+ virtual nsIntRegion ComputeChangeInternal(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged)
+ {
+ ColorLayer* color = static_cast<ColorLayer*>(mLayer.get());
+
+ if (mColor != color->GetColor()) {
+ aGeometryChanged = true;
+ return NewTransformedBounds();
+ }
+
+ nsIntRegion boundsDiff;
+ boundsDiff.Xor(mBounds, color->GetBounds());
+
+ nsIntRegion result;
+ AddTransformedRegion(result, boundsDiff, mTransform);
+
+ return result;
+ }
+
+ Color mColor;
+ IntRect mBounds;
+};
+
+static ImageHost* GetImageHost(Layer* aLayer)
+{
+ LayerComposite* composite = aLayer->AsLayerComposite();
+ if (composite) {
+ return static_cast<ImageHost*>(composite->GetCompositableHost());
+ }
+ return nullptr;
+}
+
+struct ImageLayerProperties : public LayerPropertiesBase
+{
+ explicit ImageLayerProperties(ImageLayer* aImage, bool aIsMask)
+ : LayerPropertiesBase(aImage)
+ , mContainer(aImage->GetContainer())
+ , mImageHost(GetImageHost(aImage))
+ , mSamplingFilter(aImage->GetSamplingFilter())
+ , mScaleToSize(aImage->GetScaleToSize())
+ , mScaleMode(aImage->GetScaleMode())
+ , mLastProducerID(-1)
+ , mLastFrameID(-1)
+ , mIsMask(aIsMask)
+ {
+ if (mImageHost) {
+ mLastProducerID = mImageHost->GetLastProducerID();
+ mLastFrameID = mImageHost->GetLastFrameID();
+ }
+ }
+
+ virtual nsIntRegion ComputeChangeInternal(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged)
+ {
+ ImageLayer* imageLayer = static_cast<ImageLayer*>(mLayer.get());
+
+ if (!imageLayer->GetLocalVisibleRegion().ToUnknownRegion().IsEqual(mVisibleRegion)) {
+ aGeometryChanged = true;
+ IntRect result = NewTransformedBounds();
+ result = result.Union(OldTransformedBounds());
+ return result;
+ }
+
+ ImageContainer* container = imageLayer->GetContainer();
+ ImageHost* host = GetImageHost(imageLayer);
+ if (mContainer != container ||
+ mSamplingFilter != imageLayer->GetSamplingFilter() ||
+ mScaleToSize != imageLayer->GetScaleToSize() ||
+ mScaleMode != imageLayer->GetScaleMode() ||
+ host != mImageHost ||
+ (host && host->GetProducerID() != mLastProducerID) ||
+ (host && host->GetFrameID() != mLastFrameID)) {
+ aGeometryChanged = true;
+
+ if (mIsMask) {
+ // Mask layers have an empty visible region, so we have to
+ // use the image size instead.
+ IntSize size;
+ if (container) {
+ size = container->GetCurrentSize();
+ }
+ if (host) {
+ size = host->GetImageSize();
+ }
+ IntRect rect(0, 0, size.width, size.height);
+ return TransformRect(rect, GetTransformForInvalidation(mLayer));
+ }
+ return NewTransformedBounds();
+ }
+
+ return IntRect();
+ }
+
+ RefPtr<ImageContainer> mContainer;
+ RefPtr<ImageHost> mImageHost;
+ SamplingFilter mSamplingFilter;
+ gfx::IntSize mScaleToSize;
+ ScaleMode mScaleMode;
+ int32_t mLastProducerID;
+ int32_t mLastFrameID;
+ bool mIsMask;
+};
+
+struct CanvasLayerProperties : public LayerPropertiesBase
+{
+ explicit CanvasLayerProperties(CanvasLayer* aCanvas)
+ : LayerPropertiesBase(aCanvas)
+ , mImageHost(GetImageHost(aCanvas))
+ {
+ mFrameID = mImageHost ? mImageHost->GetFrameID() : -1;
+ }
+
+ virtual nsIntRegion ComputeChangeInternal(NotifySubDocInvalidationFunc aCallback,
+ bool& aGeometryChanged)
+ {
+ CanvasLayer* canvasLayer = static_cast<CanvasLayer*>(mLayer.get());
+
+ ImageHost* host = GetImageHost(canvasLayer);
+ if (host && host->GetFrameID() != mFrameID) {
+ aGeometryChanged = true;
+
+ return NewTransformedBounds();
+ }
+
+ return IntRect();
+ }
+
+ RefPtr<ImageHost> mImageHost;
+ int32_t mFrameID;
+};
+
+UniquePtr<LayerPropertiesBase>
+CloneLayerTreePropertiesInternal(Layer* aRoot, bool aIsMask /* = false */)
+{
+ if (!aRoot) {
+ return MakeUnique<LayerPropertiesBase>();
+ }
+
+ MOZ_ASSERT(!aIsMask || aRoot->GetType() == Layer::TYPE_IMAGE);
+
+ aRoot->CheckCanary();
+
+ switch (aRoot->GetType()) {
+ case Layer::TYPE_CONTAINER:
+ case Layer::TYPE_REF:
+ return MakeUnique<ContainerLayerProperties>(aRoot->AsContainerLayer());
+ case Layer::TYPE_COLOR:
+ return MakeUnique<ColorLayerProperties>(static_cast<ColorLayer*>(aRoot));
+ case Layer::TYPE_IMAGE:
+ return MakeUnique<ImageLayerProperties>(static_cast<ImageLayer*>(aRoot), aIsMask);
+ case Layer::TYPE_CANVAS:
+ return MakeUnique<CanvasLayerProperties>(static_cast<CanvasLayer*>(aRoot));
+ case Layer::TYPE_READBACK:
+ case Layer::TYPE_SHADOW:
+ case Layer::TYPE_PAINTED:
+ return MakeUnique<LayerPropertiesBase>(aRoot);
+ }
+
+ MOZ_ASSERT_UNREACHABLE("Unexpected root layer type");
+ return MakeUnique<LayerPropertiesBase>(aRoot);
+}
+
+/* static */ UniquePtr<LayerProperties>
+LayerProperties::CloneFrom(Layer* aRoot)
+{
+ return CloneLayerTreePropertiesInternal(aRoot);
+}
+
+/* static */ void
+LayerProperties::ClearInvalidations(Layer *aLayer)
+{
+ ForEachNode<ForwardIterator>(
+ aLayer,
+ [] (Layer* layer)
+ {
+ layer->ClearInvalidRect();
+ if (layer->GetMaskLayer()) {
+ ClearInvalidations(layer->GetMaskLayer());
+ }
+ for (size_t i = 0; i < layer->GetAncestorMaskLayerCount(); i++) {
+ ClearInvalidations(layer->GetAncestorMaskLayerAt(i));
+ }
+
+ }
+ );
+}
+
+nsIntRegion
+LayerPropertiesBase::ComputeDifferences(Layer* aRoot, NotifySubDocInvalidationFunc aCallback,
+ bool* aGeometryChanged = nullptr)
+{
+ NS_ASSERTION(aRoot, "Must have a layer tree to compare against!");
+ if (mLayer != aRoot) {
+ if (aCallback) {
+ NotifySubdocumentInvalidation(aRoot, aCallback);
+ } else {
+ ClearInvalidations(aRoot);
+ }
+ IntRect result = TransformRect(aRoot->GetLocalVisibleRegion().ToUnknownRegion().GetBounds(),
+ aRoot->GetLocalTransform());
+ result = result.Union(OldTransformedBounds());
+ if (aGeometryChanged != nullptr) {
+ *aGeometryChanged = true;
+ }
+ return result;
+ } else {
+ bool geometryChanged = (aGeometryChanged != nullptr) ? *aGeometryChanged : false;
+ nsIntRegion invalid = ComputeChange(aCallback, geometryChanged);
+ if (aGeometryChanged != nullptr) {
+ *aGeometryChanged = geometryChanged;
+ }
+ return invalid;
+ }
+}
+
+void
+LayerPropertiesBase::MoveBy(const IntPoint& aOffset)
+{
+ mTransform.PostTranslate(aOffset.x, aOffset.y, 0);
+}
+
+} // namespace layers
+} // namespace mozilla