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gecko-dev/gfx/layers/LayerTreeInvalidation.cpp

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/*-*- 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
#include "LayersLogging.h"
// LayerTreeInvalidation debugging
#define LTI_DEBUG 0
#if LTI_DEBUG
# define LTI_DEEPER(aPrefix) nsPrintfCString("%s ", aPrefix).get()
# define LTI_DUMP(rgn, label) if (!(rgn).IsEmpty()) printf_stderr("%s%p: " label " portion is %s\n", aPrefix, mLayer.get(), Stringify(rgn).c_str());
# define LTI_LOG(...) printf_stderr(__VA_ARGS__)
#else
# define LTI_DEEPER(aPrefix) nullptr
# define LTI_DUMP(rgn, label)
# define LTI_LOG(...)
#endif
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->ClearInvalidRegion();
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() override
{
MOZ_COUNT_DTOR(LayerPropertiesBase);
}
protected:
LayerPropertiesBase(const LayerPropertiesBase& a) = delete;
LayerPropertiesBase& operator=(const LayerPropertiesBase& a) = delete;
public:
nsIntRegion ComputeDifferences(Layer* aRoot,
NotifySubDocInvalidationFunc aCallback) override;
void MoveBy(const IntPoint& aOffset) override;
nsIntRegion ComputeChange(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback)
{
// 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)
{
result = OldTransformedBounds();
LTI_DUMP(result, "oldtransform");
LTI_DUMP(NewTransformedBounds(), "newtransform");
AddRegion(result, NewTransformedBounds());
// We can't bail out early because we need to update mChildrenChanged.
}
nsIntRegion internal = ComputeChangeInternal(aPrefix, aCallback);
LTI_DUMP(internal, "internal");
AddRegion(result, internal);
LTI_DUMP(mLayer->GetInvalidRegion().GetRegion(), "invalid");
AddTransformedRegion(result, mLayer->GetInvalidRegion().GetRegion(), mTransform);
if (mMaskLayer && otherMask) {
nsIntRegion mask = mMaskLayer->ComputeChange(aPrefix, aCallback);
LTI_DUMP(mask, "mask");
AddTransformedRegion(result, mask, mTransform);
}
for (size_t i = 0;
i < std::min(mAncestorMaskLayers.Length(), mLayer->GetAncestorMaskLayerCount());
i++)
{
nsIntRegion mask = mAncestorMaskLayers[i]->ComputeChange(aPrefix, aCallback);
LTI_DUMP(mask, "ancestormask");
AddTransformedRegion(result, mask, mTransform);
}
if (mUseClipRect && otherClip) {
if (!mClipRect.IsEqualInterior(*otherClip)) {
nsIntRegion tmp;
tmp.Xor(mClipRect.ToUnknownRect(), otherClip->ToUnknownRect());
LTI_DUMP(tmp, "clip");
AddRegion(result, tmp);
}
}
mLayer->ClearInvalidRegion();
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(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback)
{
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(const char *aPrefix,
NotifySubDocInvalidationFunc aCallback) 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;
bool invalidateWholeLayer = false;
if (mPreXScale != container->GetPreXScale() ||
mPreYScale != container->GetPreYScale()) {
invalidOfLayer = OldTransformedBounds();
AddRegion(invalidOfLayer, NewTransformedBounds());
childrenChanged = true;
invalidateWholeLayer = 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) {
LTI_DUMP(mChildren[j]->OldTransformedBounds(), "reordered child");
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(LTI_DEEPER(aPrefix), aCallback);
i = childsOldIndex + 1;
if (!region.IsEmpty()) {
LTI_LOG("%s%p: child %p produced %s\n", aPrefix, mLayer.get(),
mChildren[childsOldIndex]->mLayer.get(), Stringify(region).c_str());
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) {
LTI_DUMP(child->GetLocalVisibleRegion().ToUnknownRegion(), "invalidateChidlsCurrentArea");
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;
LTI_DUMP(mChildren[i]->OldTransformedBounds(), "removed child");
AddRegion(result, mChildren[i]->OldTransformedBounds());
i++;
}
if (aCallback) {
aCallback(container, result);
}
if (childrenChanged) {
container->SetChildrenChanged(true);
}
if (container->UseIntermediateSurface()) {
IntRect bounds = invalidateWholeLayer
? mLayer->GetLocalVisibleRegion().ToUnknownRegion().GetBounds()
: result.GetBounds();
container->SetInvalidCompositeRect(bounds);
}
if (!mLayer->Extend3DContext()) {
// |result| contains invalid regions only of children.
result.Transform(GetTransformForInvalidation(mLayer));
}
// else, effective transforms have applied on children.
LTI_DUMP(invalidOfLayer, "invalidOfLayer");
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:
nsIntRegion ComputeChangeInternal(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback) override
{
ColorLayer* color = static_cast<ColorLayer*>(mLayer.get());
if (mColor != color->GetColor()) {
LTI_DUMP(NewTransformedBounds(), "color");
return NewTransformedBounds();
}
nsIntRegion boundsDiff;
boundsDiff.Xor(mBounds, color->GetBounds());
LTI_DUMP(boundsDiff, "colorbounds");
nsIntRegion result;
AddTransformedRegion(result, boundsDiff, mTransform);
return result;
}
Color mColor;
IntRect mBounds;
};
struct BorderLayerProperties : public LayerPropertiesBase
{
explicit BorderLayerProperties(BorderLayer *aLayer)
: LayerPropertiesBase(aLayer)
, mColors(aLayer->GetColors())
, mRect(aLayer->GetRect())
, mCorners(aLayer->GetCorners())
, mWidths(aLayer->GetWidths())
{ }
protected:
BorderLayerProperties(const BorderLayerProperties& a) = delete;
BorderLayerProperties& operator=(const BorderLayerProperties& a) = delete;
public:
nsIntRegion ComputeChangeInternal(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback) override
{
BorderLayer* border = static_cast<BorderLayer*>(mLayer.get());
if (!border->GetLocalVisibleRegion().ToUnknownRegion().IsEqual(mVisibleRegion)) {
IntRect result = NewTransformedBounds();
result = result.Union(OldTransformedBounds());
return result;
}
if (!PodEqual(&mColors[0], &border->GetColors()[0], 4) ||
!PodEqual(&mWidths[0], &border->GetWidths()[0], 4) ||
!PodEqual(&mCorners[0], &border->GetCorners()[0], 4) ||
!mRect.IsEqualEdges(border->GetRect())) {
LTI_DUMP(NewTransformedBounds(), "bounds");
return NewTransformedBounds();
}
return nsIntRegion();
}
BorderColors mColors;
LayerRect mRect;
BorderCorners mCorners;
BorderWidths mWidths;
};
struct TextLayerProperties : public LayerPropertiesBase
{
explicit TextLayerProperties(TextLayer *aLayer)
: LayerPropertiesBase(aLayer)
, mBounds(aLayer->GetBounds())
, mGlyphs(aLayer->GetGlyphs())
, mFont(aLayer->GetScaledFont())
{ }
protected:
TextLayerProperties(const TextLayerProperties& a) = delete;
TextLayerProperties& operator=(const TextLayerProperties& a) = delete;
public:
nsIntRegion ComputeChangeInternal(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback) override
{
TextLayer* text = static_cast<TextLayer*>(mLayer.get());
if (!text->GetLocalVisibleRegion().ToUnknownRegion().IsEqual(mVisibleRegion)) {
IntRect result = NewTransformedBounds();
result = result.Union(OldTransformedBounds());
return result;
}
if (!mBounds.IsEqualEdges(text->GetBounds()) ||
mGlyphs != text->GetGlyphs() ||
mFont != text->GetScaledFont()) {
LTI_DUMP(NewTransformedBounds(), "bounds");
return NewTransformedBounds();
}
return nsIntRegion();
}
gfx::IntRect mBounds;
nsTArray<GlyphArray> mGlyphs;
gfx::ScaledFont* mFont;
};
static ImageHost* GetImageHost(Layer* aLayer)
{
HostLayer* compositor = aLayer->AsHostLayer();
if (compositor) {
return static_cast<ImageHost*>(compositor->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();
}
}
nsIntRegion ComputeChangeInternal(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback) override
{
ImageLayer* imageLayer = static_cast<ImageLayer*>(mLayer.get());
if (!imageLayer->GetLocalVisibleRegion().ToUnknownRegion().IsEqual(mVisibleRegion)) {
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)) {
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);
LTI_DUMP(rect, "mask");
return TransformRect(rect, GetTransformForInvalidation(mLayer));
}
LTI_DUMP(NewTransformedBounds(), "bounds");
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;
}
nsIntRegion ComputeChangeInternal(const char* aPrefix,
NotifySubDocInvalidationFunc aCallback) override
{
CanvasLayer* canvasLayer = static_cast<CanvasLayer*>(mLayer.get());
ImageHost* host = GetImageHost(canvasLayer);
if (host && host->GetFrameID() != mFrameID) {
LTI_DUMP(NewTransformedBounds(), "frameId");
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_BORDER:
return MakeUnique<BorderLayerProperties>(static_cast<BorderLayer*>(aRoot));
case Layer::TYPE_TEXT:
return MakeUnique<TextLayerProperties>(static_cast<TextLayer*>(aRoot));
case Layer::TYPE_DISPLAYITEM:
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->ClearInvalidRegion();
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)
{
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());
return result;
}
nsIntRegion invalid = ComputeChange(" ", aCallback);
return invalid;
}
void
LayerPropertiesBase::MoveBy(const IntPoint& aOffset)
{
mTransform.PostTranslate(aOffset.x, aOffset.y, 0);
}
} // namespace layers
} // namespace mozilla
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