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gecko/layout/base/FrameLayerBuilder.cpp
Robert O'Callahan 2709003286 Bug 911889. Part 2: Refactor MarkLayersActive code into its own class and be much more explicit about what it does. r=mattwoodrow 
This also changes the functionality a little bit to track independent
per-property mutation counts and independent "content active" status.
2013-09-04 23:30:57 +12:00

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/DebugOnly.h"
#include "FrameLayerBuilder.h"
#include "nsDisplayList.h"
#include "nsPresContext.h"
#include "nsLayoutUtils.h"
#include "Layers.h"
#include "BasicLayers.h"
#include "gfxUtils.h"
#include "nsRenderingContext.h"
#include "MaskLayerImageCache.h"
#include "nsIScrollableFrame.h"
#include "nsPrintfCString.h"
#include "LayerTreeInvalidation.h"
#include "nsSVGIntegrationUtils.h"
#include "ImageContainer.h"
#include "ActiveLayerTracker.h"
#include "GeckoProfiler.h"
#include "mozilla/gfx/Tools.h"
#include <algorithm>
using namespace mozilla::layers;
using namespace mozilla::gfx;
namespace mozilla {
FrameLayerBuilder::DisplayItemData::DisplayItemData(LayerManagerData* aParent, uint32_t aKey,
Layer* aLayer, LayerState aLayerState, uint32_t aGeneration)
: mParent(aParent)
, mLayer(aLayer)
, mDisplayItemKey(aKey)
, mContainerLayerGeneration(aGeneration)
, mLayerState(aLayerState)
, mUsed(true)
, mIsInvalid(false)
{
}
FrameLayerBuilder::DisplayItemData::DisplayItemData(DisplayItemData &toCopy)
{
// This isn't actually a copy-constructor; notice that it steals toCopy's
// mGeometry pointer. Be careful.
mParent = toCopy.mParent;
mLayer = toCopy.mLayer;
mInactiveManager = toCopy.mInactiveManager;
mFrameList = toCopy.mFrameList;
mGeometry = toCopy.mGeometry;
mDisplayItemKey = toCopy.mDisplayItemKey;
mClip = toCopy.mClip;
mContainerLayerGeneration = toCopy.mContainerLayerGeneration;
mLayerState = toCopy.mLayerState;
mUsed = toCopy.mUsed;
}
void
FrameLayerBuilder::DisplayItemData::AddFrame(nsIFrame* aFrame)
{
mFrameList.AppendElement(aFrame);
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(FrameLayerBuilder::LayerManagerDataProperty()));
if (!array) {
array = new nsTArray<DisplayItemData*>();
aFrame->Properties().Set(FrameLayerBuilder::LayerManagerDataProperty(), array);
}
array->AppendElement(this);
}
void
FrameLayerBuilder::DisplayItemData::RemoveFrame(nsIFrame* aFrame)
{
DebugOnly<bool> result = mFrameList.RemoveElement(aFrame);
NS_ASSERTION(result, "Can't remove a frame that wasn't added!");
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(FrameLayerBuilder::LayerManagerDataProperty()));
NS_ASSERTION(array, "Must be already stored on the frame!");
array->RemoveElement(this);
}
void
FrameLayerBuilder::DisplayItemData::UpdateContents(Layer* aLayer, LayerState aState,
uint32_t aContainerLayerGeneration,
nsDisplayItem* aItem /* = nullptr */)
{
mLayer = aLayer;
mOptLayer = nullptr;
mInactiveManager = nullptr;
mLayerState = aState;
mContainerLayerGeneration = aContainerLayerGeneration;
mGeometry = nullptr;
mClip = DisplayItemClip();
mUsed = true;
if (!aItem) {
return;
}
nsAutoTArray<nsIFrame*, 4> copy(mFrameList);
if (!copy.RemoveElement(aItem->Frame())) {
AddFrame(aItem->Frame());
}
nsAutoTArray<nsIFrame*,4> mergedFrames;
aItem->GetMergedFrames(&mergedFrames);
for (uint32_t i = 0; i < mergedFrames.Length(); ++i) {
if (!copy.RemoveElement(mergedFrames[i])) {
AddFrame(mergedFrames[i]);
}
}
for (uint32_t i = 0; i < copy.Length(); i++) {
RemoveFrame(copy[i]);
}
}
static nsIFrame* sDestroyedFrame = nullptr;
FrameLayerBuilder::DisplayItemData::~DisplayItemData()
{
for (uint32_t i = 0; i < mFrameList.Length(); i++) {
nsIFrame* frame = mFrameList[i];
if (frame == sDestroyedFrame) {
continue;
}
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(frame->Properties().Get(LayerManagerDataProperty()));
array->RemoveElement(this);
}
}
void
FrameLayerBuilder::DisplayItemData::GetFrameListChanges(nsDisplayItem* aOther,
nsTArray<nsIFrame*>& aOut)
{
aOut = mFrameList;
nsAutoTArray<nsIFrame*, 4> added;
if (!aOut.RemoveElement(aOther->Frame())) {
added.AppendElement(aOther->Frame());
}
nsAutoTArray<nsIFrame*,4> mergedFrames;
aOther->GetMergedFrames(&mergedFrames);
for (uint32_t i = 0; i < mergedFrames.Length(); ++i) {
if (!aOut.RemoveElement(mergedFrames[i])) {
added.AppendElement(mergedFrames[i]);
}
}
aOut.AppendElements(added);
}
/**
* This is the userdata we associate with a layer manager.
*/
class LayerManagerData : public LayerUserData {
public:
LayerManagerData(LayerManager *aManager)
: mLayerManager(aManager)
#ifdef DEBUG_DISPLAY_ITEM_DATA
, mParent(nullptr)
#endif
, mInvalidateAllLayers(false)
{
MOZ_COUNT_CTOR(LayerManagerData);
}
~LayerManagerData() {
MOZ_COUNT_DTOR(LayerManagerData);
}
#ifdef DEBUG_DISPLAY_ITEM_DATA
void Dump(const char *aPrefix = "") {
printf("%sLayerManagerData %p\n", aPrefix, this);
nsAutoCString prefix;
prefix += aPrefix;
prefix += " ";
mDisplayItems.EnumerateEntries(
FrameLayerBuilder::DumpDisplayItemDataForFrame, (void*)prefix.get());
}
#endif
/**
* Tracks which frames have layers associated with them.
*/
LayerManager *mLayerManager;
#ifdef DEBUG_DISPLAY_ITEM_DATA
LayerManagerData *mParent;
#endif
nsTHashtable<nsRefPtrHashKey<FrameLayerBuilder::DisplayItemData> > mDisplayItems;
bool mInvalidateAllLayers;
};
/* static */ void
FrameLayerBuilder::DestroyDisplayItemDataFor(nsIFrame* aFrame)
{
FrameProperties props = aFrame->Properties();
props.Delete(LayerManagerDataProperty());
}
namespace {
// a global cache of image containers used for mask layers
static MaskLayerImageCache* gMaskLayerImageCache = nullptr;
static inline MaskLayerImageCache* GetMaskLayerImageCache()
{
if (!gMaskLayerImageCache) {
gMaskLayerImageCache = new MaskLayerImageCache();
}
return gMaskLayerImageCache;
}
/**
* This is a helper object used to build up the layer children for
* a ContainerLayer.
*/
class ContainerState {
public:
ContainerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
FrameLayerBuilder* aLayerBuilder,
nsIFrame* aContainerFrame,
nsDisplayItem* aContainerItem,
ContainerLayer* aContainerLayer,
const FrameLayerBuilder::ContainerParameters& aParameters) :
mBuilder(aBuilder), mManager(aManager),
mLayerBuilder(aLayerBuilder),
mContainerFrame(aContainerFrame),
mContainerLayer(aContainerLayer),
mParameters(aParameters),
mNextFreeRecycledThebesLayer(0)
{
nsPresContext* presContext = aContainerFrame->PresContext();
mAppUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
mContainerReferenceFrame = aContainerItem ? aContainerItem->ReferenceFrameForChildren() :
mBuilder->FindReferenceFrameFor(mContainerFrame);
// When AllowResidualTranslation is false, display items will be drawn
// scaled with a translation by integer pixels, so we know how the snapping
// will work.
mSnappingEnabled = aManager->IsSnappingEffectiveTransforms() &&
!mParameters.AllowResidualTranslation();
CollectOldLayers();
}
enum ProcessDisplayItemsFlags {
NO_COMPONENT_ALPHA = 0x01,
};
/**
* This is the method that actually walks a display list and builds
* the child layers.
*/
void ProcessDisplayItems(const nsDisplayList& aList, uint32_t aFlags);
/**
* This finalizes all the open ThebesLayers by popping every element off
* mThebesLayerDataStack, then sets the children of the container layer
* to be all the layers in mNewChildLayers in that order and removes any
* layers as children of the container that aren't in mNewChildLayers.
* @param aTextContentFlags if any child layer has CONTENT_COMPONENT_ALPHA,
* set *aTextContentFlags to CONTENT_COMPONENT_ALPHA
*/
void Finish(uint32_t *aTextContentFlags, LayerManagerData* aData);
nsRect GetChildrenBounds() { return mBounds; }
nscoord GetAppUnitsPerDevPixel() { return mAppUnitsPerDevPixel; }
nsIntRect ScaleToNearestPixels(const nsRect& aRect)
{
return aRect.ScaleToNearestPixels(mParameters.mXScale, mParameters.mYScale,
mAppUnitsPerDevPixel);
}
nsIntRegion ScaleRegionToNearestPixels(const nsRegion& aRegion)
{
return aRegion.ScaleToNearestPixels(mParameters.mXScale, mParameters.mYScale,
mAppUnitsPerDevPixel);
}
nsIntRect ScaleToOutsidePixels(const nsRect& aRect, bool aSnap)
{
if (aSnap && mSnappingEnabled) {
return ScaleToNearestPixels(aRect);
}
return aRect.ScaleToOutsidePixels(mParameters.mXScale, mParameters.mYScale,
mAppUnitsPerDevPixel);
}
nsIntRect ScaleToInsidePixels(const nsRect& aRect, bool aSnap)
{
if (aSnap && mSnappingEnabled) {
return ScaleToNearestPixels(aRect);
}
return aRect.ScaleToInsidePixels(mParameters.mXScale, mParameters.mYScale,
mAppUnitsPerDevPixel);
}
nsIntRegion ScaleRegionToInsidePixels(const nsRegion& aRegion, bool aSnap)
{
if (aSnap && mSnappingEnabled) {
return ScaleRegionToNearestPixels(aRegion);
}
return aRegion.ScaleToInsidePixels(mParameters.mXScale, mParameters.mYScale,
mAppUnitsPerDevPixel);
}
protected:
/**
* We keep a stack of these to represent the ThebesLayers that are
* currently available to have display items added to.
* We use a stack here because as much as possible we want to
* assign display items to existing ThebesLayers, and to the lowest
* ThebesLayer in z-order. This reduces the number of layers and
* makes it more likely a display item will be rendered to an opaque
* layer, giving us the best chance of getting subpixel AA.
*/
class ThebesLayerData {
public:
ThebesLayerData() :
mActiveScrolledRoot(nullptr), mLayer(nullptr),
mIsSolidColorInVisibleRegion(false),
mNeedComponentAlpha(false),
mForceTransparentSurface(false),
mImage(nullptr),
mCommonClipCount(-1) {}
/**
* Record that an item has been added to the ThebesLayer, so we
* need to update our regions.
* @param aVisibleRect the area of the item that's visible
* @param aDrawRect the area of the item that would be drawn if it
* was completely visible
* @param aOpaqueRect if non-null, the area of the item that's opaque.
* We pass in a separate opaque rect because the opaque rect can be
* bigger than the visible rect, and we want to have the biggest
* opaque rect that we can.
* @param aSolidColor if non-null, the visible area of the item is
* a constant color given by *aSolidColor
*/
void Accumulate(ContainerState* aState,
nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
const DisplayItemClip& aClip);
const nsIFrame* GetActiveScrolledRoot() { return mActiveScrolledRoot; }
/**
* If this represents only a nsDisplayImage, and the image type
* supports being optimized to an ImageLayer (TYPE_RASTER only) returns
* an ImageContainer for the image.
*/
already_AddRefed<ImageContainer> CanOptimizeImageLayer(nsDisplayListBuilder* aBuilder);
/**
* The region of visible content in the layer, relative to the
* container layer (which is at the snapped top-left of the display
* list reference frame).
*/
nsIntRegion mVisibleRegion;
/**
* The region of visible content above the layer and below the
* next ThebesLayerData currently in the stack, if any. Note that not
* all ThebesLayers for the container are in the ThebesLayerData stack.
* Same coordinate system as mVisibleRegion.
* This is a conservative approximation: it contains the true region.
*/
nsIntRegion mVisibleAboveRegion;
/**
* The region containing the bounds of all display items in the layer,
* regardless of visbility.
* Same coordinate system as mVisibleRegion.
* This is a conservative approximation: it contains the true region.
*/
nsIntRegion mDrawRegion;
/**
* The region containing the bounds of all display items (regardless
* of visibility) in the layer and below the next ThebesLayerData
* currently in the stack, if any.
* Note that not all ThebesLayers for the container are in the
* ThebesLayerData stack.
* Same coordinate system as mVisibleRegion.
*/
nsIntRegion mDrawAboveRegion;
/**
* The region of visible content in the layer that is opaque.
* Same coordinate system as mVisibleRegion.
*/
nsIntRegion mOpaqueRegion;
/**
* The "active scrolled root" for all content in the layer. Must
* be non-null; all content in a ThebesLayer must have the same
* active scrolled root.
*/
const nsIFrame* mActiveScrolledRoot;
ThebesLayer* mLayer;
/**
* If mIsSolidColorInVisibleRegion is true, this is the color of the visible
* region.
*/
nscolor mSolidColor;
/**
* True if every pixel in mVisibleRegion will have color mSolidColor.
*/
bool mIsSolidColorInVisibleRegion;
/**
* True if there is any text visible in the layer that's over
* transparent pixels in the layer.
*/
bool mNeedComponentAlpha;
/**
* Set if the layer should be treated as transparent, even if its entire
* area is covered by opaque display items. For example, this needs to
* be set if something is going to "punch holes" in the layer by clearing
* part of its surface.
*/
bool mForceTransparentSurface;
/**
* Stores the pointer to the nsDisplayImage if we want to
* convert this to an ImageLayer.
*/
nsDisplayImageContainer* mImage;
/**
* Stores the clip that we need to apply to the image or, if there is no
* image, a clip for SOME item in the layer. There is no guarantee which
* item's clip will be stored here and mItemClip should not be used to clip
* the whole layer - only some part of the clip should be used, as determined
* by ThebesDisplayItemLayerUserData::GetCommonClipCount() - which may even be
* no part at all.
*/
DisplayItemClip mItemClip;
/**
* The first mCommonClipCount rounded rectangle clips are identical for
* all items in the layer.
* -1 if there are no items in the layer; must be >=0 by the time that this
* data is popped from the stack.
*/
int32_t mCommonClipCount;
/*
* Updates mCommonClipCount by checking for rounded rect clips in common
* between the clip on a new item (aCurrentClip) and the common clips
* on items already in the layer (the first mCommonClipCount rounded rects
* in mItemClip).
*/
void UpdateCommonClipCount(const DisplayItemClip& aCurrentClip);
};
friend class ThebesLayerData;
/**
* Grab the next recyclable ThebesLayer, or create one if there are no
* more recyclable ThebesLayers. Does any necessary invalidation of
* a recycled ThebesLayer, and sets up the transform on the ThebesLayer
* to account for scrolling.
*/
already_AddRefed<ThebesLayer> CreateOrRecycleThebesLayer(const nsIFrame* aActiveScrolledRoot,
const nsIFrame *aReferenceFrame,
const nsPoint& aTopLeft);
/**
* Grab the next recyclable ColorLayer, or create one if there are no
* more recyclable ColorLayers.
*/
already_AddRefed<ColorLayer> CreateOrRecycleColorLayer(ThebesLayer* aThebes);
/**
* Grab the next recyclable ImageLayer, or create one if there are no
* more recyclable ImageLayers.
*/
already_AddRefed<ImageLayer> CreateOrRecycleImageLayer(ThebesLayer* aThebes);
/**
* Grab a recyclable ImageLayer for use as a mask layer for aLayer (that is a
* mask layer which has been used for aLayer before), or create one if such
* a layer doesn't exist.
*/
already_AddRefed<ImageLayer> CreateOrRecycleMaskImageLayerFor(Layer* aLayer);
/**
* Grabs all ThebesLayers and ColorLayers from the ContainerLayer and makes them
* available for recycling.
*/
void CollectOldLayers();
/**
* If aItem used to belong to a ThebesLayer, invalidates the area of
* aItem in that layer. If aNewLayer is a ThebesLayer, invalidates the area of
* aItem in that layer.
*/
void InvalidateForLayerChange(nsDisplayItem* aItem,
Layer* aNewLayer,
const DisplayItemClip& aClip,
const nsPoint& aTopLeft,
nsDisplayItemGeometry *aGeometry);
/**
* Try to determine whether the ThebesLayer at aThebesLayerIndex
* has a single opaque color behind it, over the entire bounds of its visible
* region.
* If successful, return that color, otherwise return NS_RGBA(0,0,0,0).
*/
nscolor FindOpaqueBackgroundColorFor(int32_t aThebesLayerIndex);
/**
* Indicate that we are done adding items to the ThebesLayer at the top of
* mThebesLayerDataStack. Set the final visible region and opaque-content
* flag, and pop it off the stack.
*/
void PopThebesLayerData();
/**
* Find the ThebesLayer to which we should assign the next display item.
* We scan the ThebesLayerData stack to find the topmost ThebesLayer
* that is compatible with the display item (i.e., has the same
* active scrolled root), and that has no content from other layers above
* it and intersecting the aVisibleRect.
* Returns the layer, and also updates the ThebesLayerData. Will
* push a new ThebesLayerData onto the stack if no suitable existing
* layer is found. If we choose a ThebesLayer that's already on the
* ThebesLayerData stack, later elements on the stack will be popped off.
* @param aVisibleRect the area of the next display item that's visible
* @param aActiveScrolledRoot the active scrolled root for the next
* display item
* @param aOpaqueRect if non-null, a region of the display item that is opaque
* @param aSolidColor if non-null, indicates that every pixel in aVisibleRect
* will be painted with aSolidColor by the item
*/
ThebesLayerData* FindThebesLayerFor(nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
const DisplayItemClip& aClip,
const nsIFrame* aActiveScrolledRoot,
const nsPoint& aTopLeft);
ThebesLayerData* GetTopThebesLayerData()
{
return mThebesLayerDataStack.IsEmpty() ? nullptr
: mThebesLayerDataStack[mThebesLayerDataStack.Length() - 1].get();
}
/* Build a mask layer to represent the clipping region. Will return null if
* there is no clipping specified or a mask layer cannot be built.
* Builds an ImageLayer for the appropriate backend; the mask is relative to
* aLayer's visible region.
* aLayer is the layer to be clipped.
* aRoundedRectClipCount is used when building mask layers for ThebesLayers,
* SetupMaskLayer will build a mask layer for only the first
* aRoundedRectClipCount rounded rects in aClip
*/
void SetupMaskLayer(Layer *aLayer, const DisplayItemClip& aClip,
uint32_t aRoundedRectClipCount = UINT32_MAX);
bool ChooseActiveScrolledRoot(const nsDisplayList& aList,
const nsIFrame **aActiveScrolledRoot);
nsDisplayListBuilder* mBuilder;
LayerManager* mManager;
FrameLayerBuilder* mLayerBuilder;
nsIFrame* mContainerFrame;
const nsIFrame* mContainerReferenceFrame;
ContainerLayer* mContainerLayer;
FrameLayerBuilder::ContainerParameters mParameters;
/**
* The region of ThebesLayers that should be invalidated every time
* we recycle one.
*/
nsIntRegion mInvalidThebesContent;
nsRect mBounds;
nsAutoTArray<nsAutoPtr<ThebesLayerData>,1> mThebesLayerDataStack;
/**
* We collect the list of children in here. During ProcessDisplayItems,
* the layers in this array either have mContainerLayer as their parent,
* or no parent.
*/
typedef nsAutoTArray<nsRefPtr<Layer>,1> AutoLayersArray;
AutoLayersArray mNewChildLayers;
nsTArray<nsRefPtr<ThebesLayer> > mRecycledThebesLayers;
nsDataHashtable<nsPtrHashKey<Layer>, nsRefPtr<ImageLayer> >
mRecycledMaskImageLayers;
uint32_t mNextFreeRecycledThebesLayer;
nscoord mAppUnitsPerDevPixel;
bool mSnappingEnabled;
};
class ThebesDisplayItemLayerUserData : public LayerUserData
{
public:
ThebesDisplayItemLayerUserData() :
mMaskClipCount(0),
mForcedBackgroundColor(NS_RGBA(0,0,0,0)),
mXScale(1.f), mYScale(1.f),
mAppUnitsPerDevPixel(0),
mTranslation(0, 0),
mActiveScrolledRootPosition(0, 0) {}
/**
* Record the number of clips in the Thebes layer's mask layer.
* Should not be reset when the layer is recycled since it is used to track
* changes in the use of mask layers.
*/
uint32_t mMaskClipCount;
/**
* A color that should be painted over the bounds of the layer's visible
* region before any other content is painted.
*/
nscolor mForcedBackgroundColor;
/**
* The resolution scale used.
*/
float mXScale, mYScale;
/**
* The appunits per dev pixel for the items in this layer.
*/
nscoord mAppUnitsPerDevPixel;
/**
* The offset from the ThebesLayer's 0,0 to the
* reference frame. This isn't necessarily the same as the transform
* set on the ThebesLayer since we might also be applying an extra
* offset specified by the parent ContainerLayer/
*/
nsIntPoint mTranslation;
/**
* We try to make 0,0 of the ThebesLayer be the top-left of the
* border-box of the "active scrolled root" frame (i.e. the nearest ancestor
* frame for the display items that is being actively scrolled). But
* we force the ThebesLayer transform to be an integer translation, and we may
* have a resolution scale, so we have to snap the ThebesLayer transform, so
* 0,0 may not be exactly the top-left of the active scrolled root. Here we
* store the coordinates in ThebesLayer space of the top-left of the
* active scrolled root.
*/
gfxPoint mActiveScrolledRootPosition;
nsIntRegion mRegionToInvalidate;
// The offset between the active scrolled root of this layer
// and the root of the container for the previous and current
// paints respectively.
nsPoint mLastActiveScrolledRootOrigin;
nsPoint mActiveScrolledRootOrigin;
nsRefPtr<ColorLayer> mColorLayer;
nsRefPtr<ImageLayer> mImageLayer;
};
/*
* User data for layers which will be used as masks.
*/
struct MaskLayerUserData : public LayerUserData
{
MaskLayerUserData() : mImageKey(nullptr) {}
bool
operator== (const MaskLayerUserData& aOther) const
{
return mRoundedClipRects == aOther.mRoundedClipRects &&
mScaleX == aOther.mScaleX &&
mScaleY == aOther.mScaleY &&
mOffset == aOther.mOffset &&
mAppUnitsPerDevPixel == aOther.mAppUnitsPerDevPixel;
}
nsRefPtr<const MaskLayerImageCache::MaskLayerImageKey> mImageKey;
// properties of the mask layer; the mask layer may be re-used if these
// remain unchanged.
nsTArray<DisplayItemClip::RoundedRect> mRoundedClipRects;
// scale from the masked layer which is applied to the mask
float mScaleX, mScaleY;
// The ContainerParameters offset which is applied to the mask's transform.
nsIntPoint mOffset;
int32_t mAppUnitsPerDevPixel;
};
/**
* The address of gThebesDisplayItemLayerUserData is used as the user
* data key for ThebesLayers created by FrameLayerBuilder.
* It identifies ThebesLayers used to draw non-layer content, which are
* therefore eligible for recycling. We want display items to be able to
* create their own dedicated ThebesLayers in BuildLayer, if necessary,
* and we wouldn't want to accidentally recycle those.
* The user data is a ThebesDisplayItemLayerUserData.
*/
uint8_t gThebesDisplayItemLayerUserData;
/**
* The address of gColorLayerUserData is used as the user
* data key for ColorLayers created by FrameLayerBuilder.
* The user data is null.
*/
uint8_t gColorLayerUserData;
/**
* The address of gImageLayerUserData is used as the user
* data key for ImageLayers created by FrameLayerBuilder.
* The user data is null.
*/
uint8_t gImageLayerUserData;
/**
* The address of gLayerManagerUserData is used as the user
* data key for retained LayerManagers managed by FrameLayerBuilder.
* The user data is a LayerManagerData.
*/
uint8_t gLayerManagerUserData;
/**
* The address of gMaskLayerUserData is used as the user
* data key for mask layers managed by FrameLayerBuilder.
* The user data is a MaskLayerUserData.
*/
uint8_t gMaskLayerUserData;
/**
* Helper functions for getting user data and casting it to the correct type.
* aLayer is the layer where the user data is stored.
*/
MaskLayerUserData* GetMaskLayerUserData(Layer* aLayer)
{
return static_cast<MaskLayerUserData*>(aLayer->GetUserData(&gMaskLayerUserData));
}
ThebesDisplayItemLayerUserData* GetThebesDisplayItemLayerUserData(Layer* aLayer)
{
return static_cast<ThebesDisplayItemLayerUserData*>(
aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
}
} // anonymous namespace
/* static */ void
FrameLayerBuilder::Shutdown()
{
if (gMaskLayerImageCache) {
delete gMaskLayerImageCache;
gMaskLayerImageCache = nullptr;
}
}
void
FrameLayerBuilder::Init(nsDisplayListBuilder* aBuilder, LayerManager* aManager)
{
mDisplayListBuilder = aBuilder;
mRootPresContext = aBuilder->RootReferenceFrame()->PresContext()->GetRootPresContext();
if (mRootPresContext) {
mInitialDOMGeneration = mRootPresContext->GetDOMGeneration();
}
aManager->SetUserData(&gLayerManagerLayerBuilder, this);
}
void
FrameLayerBuilder::FlashPaint(gfxContext *aContext)
{
float r = float(rand()) / RAND_MAX;
float g = float(rand()) / RAND_MAX;
float b = float(rand()) / RAND_MAX;
aContext->SetColor(gfxRGBA(r, g, b, 0.4));
aContext->Paint();
}
FrameLayerBuilder::DisplayItemData*
FrameLayerBuilder::GetDisplayItemData(nsIFrame* aFrame, uint32_t aKey)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (array) {
for (uint32_t i = 0; i < array->Length(); i++) {
DisplayItemData* item = array->ElementAt(i);
if (item->mDisplayItemKey == aKey &&
item->mLayer->Manager() == mRetainingManager) {
return item;
}
}
}
return nullptr;
}
nsACString&
AppendToString(nsACString& s, const nsIntRect& r,
const char* pfx="", const char* sfx="")
{
s += pfx;
s += nsPrintfCString(
"(x=%d, y=%d, w=%d, h=%d)",
r.x, r.y, r.width, r.height);
return s += sfx;
}
nsACString&
AppendToString(nsACString& s, const nsIntRegion& r,
const char* pfx="", const char* sfx="")
{
s += pfx;
nsIntRegionRectIterator it(r);
s += "< ";
while (const nsIntRect* sr = it.Next()) {
AppendToString(s, *sr) += "; ";
}
s += ">";
return s += sfx;
}
/**
* Invalidate aRegion in aLayer. aLayer is in the coordinate system
* *after* aTranslation has been applied, so we need to
* apply the inverse of that transform before calling InvalidateRegion.
*/
static void
InvalidatePostTransformRegion(ThebesLayer* aLayer, const nsIntRegion& aRegion,
const nsIntPoint& aTranslation)
{
// Convert the region from the coordinates of the container layer
// (relative to the snapped top-left of the display list reference frame)
// to the ThebesLayer's own coordinates
nsIntRegion rgn = aRegion;
rgn.MoveBy(-aTranslation);
aLayer->InvalidateRegion(rgn);
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
nsAutoCString str;
AppendToString(str, rgn);
printf("Invalidating layer %p: %s\n", aLayer, str.get());
}
#endif
}
static void
InvalidatePostTransformRegion(ThebesLayer* aLayer, const nsRect& aRect,
const DisplayItemClip& aClip,
const nsIntPoint& aTranslation)
{
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>(aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
nsRect rect = aClip.ApplyNonRoundedIntersection(aRect);
nsIntRect pixelRect = rect.ScaleToOutsidePixels(data->mXScale, data->mYScale, data->mAppUnitsPerDevPixel);
InvalidatePostTransformRegion(aLayer, pixelRect, aTranslation);
}
static nsIntPoint
GetTranslationForThebesLayer(ThebesLayer* aLayer)
{
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>
(aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
NS_ASSERTION(data, "Must be a tracked thebes layer!");
return data->mTranslation;
}
/**
* Some frames can have multiple, nested, retaining layer managers
* associated with them (normal manager, inactive managers, SVG effects).
* In these cases we store the 'outermost' LayerManager data property
* on the frame since we can walk down the chain from there.
*
* If one of these frames has just been destroyed, we will free the inner
* layer manager when removing the entry from mFramesWithLayers. Destroying
* the layer manager destroys the LayerManagerData and calls into
* the DisplayItemData destructor. If the inner layer manager had any
* items with the same frame, then we attempt to retrieve properties
* from the deleted frame.
*
* Cache the destroyed frame pointer here so we can avoid crashing in this case.
*/
/* static */ void
FrameLayerBuilder::RemoveFrameFromLayerManager(nsIFrame* aFrame,
void* aPropertyValue)
{
sDestroyedFrame = aFrame;
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aPropertyValue);
// Hold a reference to all the items so that they don't get
// deleted from under us.
nsTArray<nsRefPtr<DisplayItemData> > arrayCopy;
for (uint32_t i = 0; i < array->Length(); ++i) {
arrayCopy.AppendElement(array->ElementAt(i));
}
#ifdef DEBUG_DISPLAY_ITEM_DATA
if (array->Length()) {
LayerManagerData *rootData = array->ElementAt(0)->mParent;
while (rootData->mParent) {
rootData = rootData->mParent;
}
printf("Removing frame %p - dumping display data\n", aFrame);
rootData->Dump();
}
#endif
for (uint32_t i = 0; i < array->Length(); ++i) {
DisplayItemData* data = array->ElementAt(i);
ThebesLayer* t = data->mLayer->AsThebesLayer();
if (t) {
ThebesDisplayItemLayerUserData* thebesData =
static_cast<ThebesDisplayItemLayerUserData*>(t->GetUserData(&gThebesDisplayItemLayerUserData));
if (thebesData) {
nsRegion old = data->mGeometry->ComputeInvalidationRegion();
nsIntRegion rgn = old.ScaleToOutsidePixels(thebesData->mXScale, thebesData->mYScale, thebesData->mAppUnitsPerDevPixel);
rgn.MoveBy(-GetTranslationForThebesLayer(t));
thebesData->mRegionToInvalidate.Or(thebesData->mRegionToInvalidate, rgn);
thebesData->mRegionToInvalidate.SimplifyOutward(8);
}
}
data->mParent->mDisplayItems.RemoveEntry(data);
}
arrayCopy.Clear();
delete array;
sDestroyedFrame = nullptr;
}
void
FrameLayerBuilder::DidBeginRetainedLayerTransaction(LayerManager* aManager)
{
mRetainingManager = aManager;
LayerManagerData* data = static_cast<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
if (data) {
mInvalidateAllLayers = data->mInvalidateAllLayers;
} else {
data = new LayerManagerData(aManager);
aManager->SetUserData(&gLayerManagerUserData, data);
}
}
void
FrameLayerBuilder::StoreOptimizedLayerForFrame(nsDisplayItem* aItem, Layer* aLayer)
{
if (!mRetainingManager) {
return;
}
DisplayItemData* data = GetDisplayItemDataForManager(aItem, aLayer->Manager());
NS_ASSERTION(data, "Must have already stored data for this item!");
data->mOptLayer = aLayer;
}
void
FrameLayerBuilder::DidEndTransaction()
{
GetMaskLayerImageCache()->Sweep();
}
void
FrameLayerBuilder::WillEndTransaction()
{
if (!mRetainingManager) {
return;
}
// We need to save the data we'll need to support retaining.
LayerManagerData* data = static_cast<LayerManagerData*>
(mRetainingManager->GetUserData(&gLayerManagerUserData));
NS_ASSERTION(data, "Must have data!");
// Update all the frames that used to have layers.
data->mDisplayItems.EnumerateEntries(ProcessRemovedDisplayItems, this);
data->mInvalidateAllLayers = false;
}
/* static */ PLDHashOperator
FrameLayerBuilder::ProcessRemovedDisplayItems(nsRefPtrHashKey<DisplayItemData>* aEntry,
void* aUserArg)
{
DisplayItemData* data = aEntry->GetKey();
if (!data->mUsed) {
// This item was visible, but isn't anymore.
FrameLayerBuilder* layerBuilder = static_cast<FrameLayerBuilder*>(aUserArg);
ThebesLayer* t = data->mLayer->AsThebesLayer();
if (t) {
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Invalidating unused display item (%i) belonging to frame %p from layer %p\n", data->mDisplayItemKey, data->mFrameList[0], t);
}
#endif
InvalidatePostTransformRegion(t,
data->mGeometry->ComputeInvalidationRegion(),
data->mClip,
layerBuilder->GetLastPaintOffset(t));
}
return PL_DHASH_REMOVE;
}
data->mUsed = false;
data->mIsInvalid = false;
return PL_DHASH_NEXT;
}
/* static */ PLDHashOperator
FrameLayerBuilder::DumpDisplayItemDataForFrame(nsRefPtrHashKey<DisplayItemData>* aEntry,
void* aClosure)
{
#ifdef DEBUG_DISPLAY_ITEM_DATA
DisplayItemData *data = aEntry->GetKey();
nsAutoCString prefix;
prefix += static_cast<const char*>(aClosure);
const char *layerState;
switch (data->mLayerState) {
case LAYER_NONE:
layerState = "LAYER_NONE"; break;
case LAYER_INACTIVE:
layerState = "LAYER_INACTIVE"; break;
case LAYER_ACTIVE:
layerState = "LAYER_ACTIVE"; break;
case LAYER_ACTIVE_FORCE:
layerState = "LAYER_ACTIVE_FORCE"; break;
case LAYER_ACTIVE_EMPTY:
layerState = "LAYER_ACTIVE_EMPTY"; break;
case LAYER_SVG_EFFECTS:
layerState = "LAYER_SVG_EFFECTS"; break;
}
uint32_t mask = (1 << nsDisplayItem::TYPE_BITS) - 1;
nsAutoCString str;
str += prefix;
str += nsPrintfCString("Frame %p ", data->mFrameList[0]);
str += nsDisplayItem::DisplayItemTypeName(static_cast<nsDisplayItem::Type>(data->mDisplayItemKey & mask));
if ((data->mDisplayItemKey >> nsDisplayItem::TYPE_BITS)) {
str += nsPrintfCString("(%i)", data->mDisplayItemKey >> nsDisplayItem::TYPE_BITS);
}
str += nsPrintfCString(", %s, Layer %p", layerState, data->mLayer.get());
if (data->mOptLayer) {
str += nsPrintfCString(", OptLayer %p", data->mOptLayer.get());
}
if (data->mInactiveManager) {
str += nsPrintfCString(", InactiveLayerManager %p", data->mInactiveManager.get());
}
str += "\n";
printf("%s", str.get());
if (data->mInactiveManager) {
prefix += " ";
printf("%sDumping inactive layer info:\n", prefix.get());
LayerManagerData* lmd = static_cast<LayerManagerData*>
(data->mInactiveManager->GetUserData(&gLayerManagerUserData));
lmd->Dump(prefix.get());
}
#endif
return PL_DHASH_NEXT;
}
/* static */ FrameLayerBuilder::DisplayItemData*
FrameLayerBuilder::GetDisplayItemDataForManager(nsDisplayItem* aItem,
LayerManager* aManager)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aItem->Frame()->Properties().Get(LayerManagerDataProperty()));
if (array) {
for (uint32_t i = 0; i < array->Length(); i++) {
DisplayItemData* item = array->ElementAt(i);
if (item->mDisplayItemKey == aItem->GetPerFrameKey() &&
item->mLayer->Manager() == aManager) {
return item;
}
}
}
return nullptr;
}
bool
FrameLayerBuilder::HasRetainedDataFor(nsIFrame* aFrame, uint32_t aDisplayItemKey)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (array) {
for (uint32_t i = 0; i < array->Length(); i++) {
if (array->ElementAt(i)->mDisplayItemKey == aDisplayItemKey) {
return true;
}
}
}
return false;
}
void
FrameLayerBuilder::IterateRetainedDataFor(nsIFrame* aFrame, DisplayItemDataCallback aCallback)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (!array) {
return;
}
for (uint32_t i = 0; i < array->Length(); i++) {
DisplayItemData* data = array->ElementAt(i);
if (data->mDisplayItemKey != nsDisplayItem::TYPE_ZERO) {
aCallback(aFrame, data);
}
}
}
FrameLayerBuilder::DisplayItemData*
FrameLayerBuilder::GetOldLayerForFrame(nsIFrame* aFrame, uint32_t aDisplayItemKey)
{
// If we need to build a new layer tree, then just refuse to recycle
// anything.
if (!mRetainingManager || mInvalidateAllLayers)
return nullptr;
DisplayItemData *data = GetDisplayItemData(aFrame, aDisplayItemKey);
if (data && data->mLayer->Manager() == mRetainingManager) {
return data;
}
return nullptr;
}
Layer*
FrameLayerBuilder::GetOldLayerFor(nsDisplayItem* aItem,
nsDisplayItemGeometry** aOldGeometry,
DisplayItemClip** aOldClip,
nsTArray<nsIFrame*>* aChangedFrames,
bool *aIsInvalid)
{
uint32_t key = aItem->GetPerFrameKey();
nsIFrame* frame = aItem->Frame();
DisplayItemData* oldData = GetOldLayerForFrame(frame, key);
if (oldData) {
if (aOldGeometry) {
*aOldGeometry = oldData->mGeometry.get();
}
if (aOldClip) {
*aOldClip = &oldData->mClip;
}
if (aChangedFrames) {
oldData->GetFrameListChanges(aItem, *aChangedFrames);
}
if (aIsInvalid) {
*aIsInvalid = oldData->mIsInvalid;
}
return oldData->mLayer;
}
return nullptr;
}
/* static */ Layer*
FrameLayerBuilder::GetDebugOldLayerFor(nsIFrame* aFrame, uint32_t aDisplayItemKey)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (!array) {
return nullptr;
}
for (uint32_t i = 0; i < array->Length(); i++) {
DisplayItemData *data = array->ElementAt(i);
if (data->mDisplayItemKey == aDisplayItemKey) {
return data->mLayer;
}
}
return nullptr;
}
already_AddRefed<ColorLayer>
ContainerState::CreateOrRecycleColorLayer(ThebesLayer *aThebes)
{
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>(aThebes->GetUserData(&gThebesDisplayItemLayerUserData));
nsRefPtr<ColorLayer> layer = data->mColorLayer;
if (layer) {
layer->SetMaskLayer(nullptr);
} else {
// Create a new layer
layer = mManager->CreateColorLayer();
if (!layer)
return nullptr;
// Mark this layer as being used for Thebes-painting display items
data->mColorLayer = layer;
layer->SetUserData(&gColorLayerUserData, nullptr);
// Remove other layer types we might have stored for this ThebesLayer
data->mImageLayer = nullptr;
}
return layer.forget();
}
already_AddRefed<ImageLayer>
ContainerState::CreateOrRecycleImageLayer(ThebesLayer *aThebes)
{
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>(aThebes->GetUserData(&gThebesDisplayItemLayerUserData));
nsRefPtr<ImageLayer> layer = data->mImageLayer;
if (layer) {
layer->SetMaskLayer(nullptr);
} else {
// Create a new layer
layer = mManager->CreateImageLayer();
if (!layer)
return nullptr;
// Mark this layer as being used for Thebes-painting display items
data->mImageLayer = layer;
layer->SetUserData(&gImageLayerUserData, nullptr);
// Remove other layer types we might have stored for this ThebesLayer
data->mColorLayer = nullptr;
}
return layer.forget();
}
already_AddRefed<ImageLayer>
ContainerState::CreateOrRecycleMaskImageLayerFor(Layer* aLayer)
{
nsRefPtr<ImageLayer> result = mRecycledMaskImageLayers.Get(aLayer);
if (result) {
mRecycledMaskImageLayers.Remove(aLayer);
// XXX if we use clip on mask layers, null it out here
} else {
// Create a new layer
result = mManager->CreateImageLayer();
if (!result)
return nullptr;
result->SetUserData(&gMaskLayerUserData, new MaskLayerUserData());
result->SetDisallowBigImage(true);
}
return result.forget();
}
static const double SUBPIXEL_OFFSET_EPSILON = 0.02;
/**
* This normally computes NSToIntRoundUp(aValue). However, if that would
* give a residual near 0.5 while aOldResidual is near -0.5, or
* it would give a residual near -0.5 while aOldResidual is near 0.5, then
* instead we return the integer in the other direction so that the residual
* is close to aOldResidual.
*/
static int32_t
RoundToMatchResidual(double aValue, double aOldResidual)
{
int32_t v = NSToIntRoundUp(aValue);
double residual = aValue - v;
if (aOldResidual < 0) {
if (residual > 0 && fabs(residual - 1.0 - aOldResidual) < SUBPIXEL_OFFSET_EPSILON) {
// Round up instead
return int32_t(ceil(aValue));
}
} else if (aOldResidual > 0) {
if (residual < 0 && fabs(residual + 1.0 - aOldResidual) < SUBPIXEL_OFFSET_EPSILON) {
// Round down instead
return int32_t(floor(aValue));
}
}
return v;
}
static void
ResetScrollPositionForLayerPixelAlignment(const nsIFrame* aActiveScrolledRoot)
{
nsIScrollableFrame* sf = nsLayoutUtils::GetScrollableFrameFor(aActiveScrolledRoot);
if (sf) {
sf->ResetScrollPositionForLayerPixelAlignment();
}
}
static void
InvalidateEntireThebesLayer(ThebesLayer* aLayer, const nsIFrame* aActiveScrolledRoot)
{
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Invalidating entire layer %p\n", aLayer);
}
#endif
nsIntRect invalidate = aLayer->GetValidRegion().GetBounds();
aLayer->InvalidateRegion(invalidate);
ResetScrollPositionForLayerPixelAlignment(aActiveScrolledRoot);
}
already_AddRefed<ThebesLayer>
ContainerState::CreateOrRecycleThebesLayer(const nsIFrame* aActiveScrolledRoot,
const nsIFrame* aReferenceFrame,
const nsPoint& aTopLeft)
{
// We need a new thebes layer
nsRefPtr<ThebesLayer> layer;
ThebesDisplayItemLayerUserData* data;
#ifndef MOZ_ANDROID_OMTC
bool didResetScrollPositionForLayerPixelAlignment = false;
#endif
if (mNextFreeRecycledThebesLayer < mRecycledThebesLayers.Length()) {
// Recycle a layer
layer = mRecycledThebesLayers[mNextFreeRecycledThebesLayer];
++mNextFreeRecycledThebesLayer;
// Clear clip rect and mask layer so we don't accidentally stay clipped.
// We will reapply any necessary clipping.
layer->SetMaskLayer(nullptr);
data = static_cast<ThebesDisplayItemLayerUserData*>
(layer->GetUserData(&gThebesDisplayItemLayerUserData));
NS_ASSERTION(data, "Recycled ThebesLayers must have user data");
// This gets called on recycled ThebesLayers that are going to be in the
// final layer tree, so it's a convenient time to invalidate the
// content that changed where we don't know what ThebesLayer it belonged
// to, or if we need to invalidate the entire layer, we can do that.
// This needs to be done before we update the ThebesLayer to its new
// transform. See nsGfxScrollFrame::InvalidateInternal, where
// we ensure that mInvalidThebesContent is updated according to the
// scroll position as of the most recent paint.
if (!FuzzyEqual(data->mXScale, mParameters.mXScale, 0.00001f) ||
!FuzzyEqual(data->mYScale, mParameters.mYScale, 0.00001f) ||
data->mAppUnitsPerDevPixel != mAppUnitsPerDevPixel) {
InvalidateEntireThebesLayer(layer, aActiveScrolledRoot);
#ifndef MOZ_ANDROID_OMTC
didResetScrollPositionForLayerPixelAlignment = true;
#endif
}
if (!data->mRegionToInvalidate.IsEmpty()) {
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Invalidating deleted frame content from layer %p\n", layer.get());
}
#endif
layer->InvalidateRegion(data->mRegionToInvalidate);
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
nsAutoCString str;
AppendToString(str, data->mRegionToInvalidate);
printf("Invalidating layer %p: %s\n", layer.get(), str.get());
}
#endif
data->mRegionToInvalidate.SetEmpty();
}
// We do not need to Invalidate these areas in the widget because we
// assume the caller of InvalidateThebesLayerContents has ensured
// the area is invalidated in the widget.
} else {
// Create a new thebes layer
layer = mManager->CreateThebesLayer();
if (!layer)
return nullptr;
// Mark this layer as being used for Thebes-painting display items
data = new ThebesDisplayItemLayerUserData();
layer->SetUserData(&gThebesDisplayItemLayerUserData, data);
ResetScrollPositionForLayerPixelAlignment(aActiveScrolledRoot);
#ifndef MOZ_ANDROID_OMTC
didResetScrollPositionForLayerPixelAlignment = true;
#endif
}
data->mXScale = mParameters.mXScale;
data->mYScale = mParameters.mYScale;
data->mLastActiveScrolledRootOrigin = data->mActiveScrolledRootOrigin;
data->mActiveScrolledRootOrigin = aTopLeft;
data->mAppUnitsPerDevPixel = mAppUnitsPerDevPixel;
layer->SetAllowResidualTranslation(mParameters.AllowResidualTranslation());
mLayerBuilder->SaveLastPaintOffset(layer);
// Set up transform so that 0,0 in the Thebes layer corresponds to the
// (pixel-snapped) top-left of the aActiveScrolledRoot.
nsPoint offset = aActiveScrolledRoot->GetOffsetToCrossDoc(aReferenceFrame);
nscoord appUnitsPerDevPixel = aActiveScrolledRoot->PresContext()->AppUnitsPerDevPixel();
gfxPoint scaledOffset(
NSAppUnitsToDoublePixels(offset.x, appUnitsPerDevPixel)*mParameters.mXScale,
NSAppUnitsToDoublePixels(offset.y, appUnitsPerDevPixel)*mParameters.mYScale);
// We call RoundToMatchResidual here so that the residual after rounding
// is close to data->mActiveScrolledRootPosition if possible.
nsIntPoint pixOffset(RoundToMatchResidual(scaledOffset.x, data->mActiveScrolledRootPosition.x),
RoundToMatchResidual(scaledOffset.y, data->mActiveScrolledRootPosition.y));
data->mTranslation = pixOffset;
pixOffset += mParameters.mOffset;
gfxMatrix matrix;
matrix.Translate(gfxPoint(pixOffset.x, pixOffset.y));
layer->SetBaseTransform(gfx3DMatrix::From2D(matrix));
// FIXME: Temporary workaround for bug 681192 and bug 724786.
#ifndef MOZ_ANDROID_OMTC
// Calculate exact position of the top-left of the active scrolled root.
// This might not be 0,0 due to the snapping in ScaleToNearestPixels.
gfxPoint activeScrolledRootTopLeft = scaledOffset - matrix.GetTranslation() + mParameters.mOffset;
// If it has changed, then we need to invalidate the entire layer since the
// pixels in the layer buffer have the content at a (subpixel) offset
// from what we need.
if (!activeScrolledRootTopLeft.WithinEpsilonOf(data->mActiveScrolledRootPosition, SUBPIXEL_OFFSET_EPSILON)) {
data->mActiveScrolledRootPosition = activeScrolledRootTopLeft;
InvalidateEntireThebesLayer(layer, aActiveScrolledRoot);
} else if (didResetScrollPositionForLayerPixelAlignment) {
data->mActiveScrolledRootPosition = activeScrolledRootTopLeft;
}
#endif
return layer.forget();
}
#ifdef MOZ_DUMP_PAINTING
/**
* Returns the appunits per dev pixel for the item's frame
*/
static int32_t
AppUnitsPerDevPixel(nsDisplayItem* aItem)
{
// The underlying frame for zoom items is the root frame of the subdocument.
// But zoom display items report their bounds etc using the parent document's
// APD because zoom items act as a conversion layer between the two different
// APDs.
if (aItem->GetType() == nsDisplayItem::TYPE_ZOOM) {
return static_cast<nsDisplayZoom*>(aItem)->GetParentAppUnitsPerDevPixel();
}
return aItem->Frame()->PresContext()->AppUnitsPerDevPixel();
}
#endif
/**
* Restrict the visible region of aLayer to the region that is actually visible.
* Because we only reduce the visible region here, we don't need to worry
* about whether CONTENT_OPAQUE is set; if layer was opaque in the old
* visible region, it will still be opaque in the new one.
* @param aLayerVisibleRegion the visible region of the layer, in the layer's
* coordinate space
* @param aRestrictToRect the rect to restrict the visible region to, in the
* parent's coordinate system
*/
static void
SetVisibleRegionForLayer(Layer* aLayer, const nsIntRegion& aLayerVisibleRegion,
const nsIntRect& aRestrictToRect)
{
gfx3DMatrix transform = aLayer->GetTransform();
// if 'transform' is not invertible, then nothing will be displayed
// for the layer, so it doesn't really matter what we do here
gfxRect itemVisible(aRestrictToRect.x, aRestrictToRect.y,
aRestrictToRect.width, aRestrictToRect.height);
gfxRect layerVisible = transform.Inverse().ProjectRectBounds(itemVisible);
layerVisible.RoundOut();
nsIntRect visibleRect;
if (!gfxUtils::GfxRectToIntRect(layerVisible, &visibleRect)) {
aLayer->SetVisibleRegion(nsIntRegion());
} else {
nsIntRegion rgn;
rgn.And(aLayerVisibleRegion, visibleRect);
aLayer->SetVisibleRegion(rgn);
}
}
nscolor
ContainerState::FindOpaqueBackgroundColorFor(int32_t aThebesLayerIndex)
{
ThebesLayerData* target = mThebesLayerDataStack[aThebesLayerIndex];
for (int32_t i = aThebesLayerIndex - 1; i >= 0; --i) {
ThebesLayerData* candidate = mThebesLayerDataStack[i];
nsIntRegion visibleAboveIntersection;
visibleAboveIntersection.And(candidate->mVisibleAboveRegion, target->mVisibleRegion);
if (!visibleAboveIntersection.IsEmpty()) {
// Some non-Thebes content between target and candidate; this is
// hopeless
break;
}
nsIntRegion intersection;
intersection.And(candidate->mVisibleRegion, target->mVisibleRegion);
if (intersection.IsEmpty()) {
// The layer doesn't intersect our target, ignore it and move on
continue;
}
// The candidate intersects our target. If any layer has a solid-color
// area behind our target, this must be it. Scan its display items.
nsIntRect deviceRect = target->mVisibleRegion.GetBounds();
nsRect appUnitRect = deviceRect.ToAppUnits(mAppUnitsPerDevPixel);
appUnitRect.ScaleInverseRoundOut(mParameters.mXScale, mParameters.mYScale);
FrameLayerBuilder::ThebesLayerItemsEntry* entry =
mLayerBuilder->GetThebesLayerItemsEntry(candidate->mLayer);
NS_ASSERTION(entry, "Must know about this layer!");
for (int32_t j = entry->mItems.Length() - 1; j >= 0; --j) {
nsDisplayItem* item = entry->mItems[j].mItem;
bool snap;
nsRect bounds = item->GetBounds(mBuilder, &snap);
if (snap && mSnappingEnabled) {
nsIntRect snappedBounds = ScaleToNearestPixels(bounds);
if (!snappedBounds.Intersects(deviceRect))
continue;
if (!snappedBounds.Contains(deviceRect))
break;
} else {
// The layer's visible rect is already (close enough to) pixel
// aligned, so no need to round out and in here.
if (!bounds.Intersects(appUnitRect))
continue;
if (!bounds.Contains(appUnitRect))
break;
}
nscolor color;
if (item->IsUniform(mBuilder, &color) && NS_GET_A(color) == 255)
return color;
break;
}
break;
}
return NS_RGBA(0,0,0,0);
}
void
ContainerState::ThebesLayerData::UpdateCommonClipCount(
const DisplayItemClip& aCurrentClip)
{
if (mCommonClipCount >= 0) {
mCommonClipCount = mItemClip.GetCommonRoundedRectCount(aCurrentClip, mCommonClipCount);
} else {
// first item in the layer
mCommonClipCount = aCurrentClip.GetRoundedRectCount();
}
}
already_AddRefed<ImageContainer>
ContainerState::ThebesLayerData::CanOptimizeImageLayer(nsDisplayListBuilder* aBuilder)
{
if (!mImage) {
return nullptr;
}
return mImage->GetContainer(mLayer->Manager(), aBuilder);
}
void
ContainerState::PopThebesLayerData()
{
NS_ASSERTION(!mThebesLayerDataStack.IsEmpty(), "Can't pop");
int32_t lastIndex = mThebesLayerDataStack.Length() - 1;
ThebesLayerData* data = mThebesLayerDataStack[lastIndex];
nsRefPtr<Layer> layer;
nsRefPtr<ImageContainer> imageContainer = data->CanOptimizeImageLayer(mBuilder);
if ((data->mIsSolidColorInVisibleRegion || imageContainer) &&
data->mLayer->GetValidRegion().IsEmpty()) {
NS_ASSERTION(!(data->mIsSolidColorInVisibleRegion && imageContainer),
"Can't be a solid color as well as an image!");
if (imageContainer) {
nsRefPtr<ImageLayer> imageLayer = CreateOrRecycleImageLayer(data->mLayer);
imageLayer->SetContainer(imageContainer);
data->mImage->ConfigureLayer(imageLayer, mParameters.mOffset);
imageLayer->SetPostScale(mParameters.mXScale,
mParameters.mYScale);
if (data->mItemClip.HasClip()) {
nsIntRect clip = ScaleToNearestPixels(data->mItemClip.GetClipRect());
clip.MoveBy(mParameters.mOffset);
imageLayer->SetClipRect(&clip);
} else {
imageLayer->SetClipRect(nullptr);
}
layer = imageLayer;
mLayerBuilder->StoreOptimizedLayerForFrame(data->mImage,
imageLayer);
} else {
nsRefPtr<ColorLayer> colorLayer = CreateOrRecycleColorLayer(data->mLayer);
colorLayer->SetIsFixedPosition(data->mLayer->GetIsFixedPosition());
colorLayer->SetColor(data->mSolidColor);
// Copy transform
colorLayer->SetBaseTransform(data->mLayer->GetBaseTransform());
colorLayer->SetPostScale(data->mLayer->GetPostXScale(), data->mLayer->GetPostYScale());
nsIntRect visibleRect = data->mVisibleRegion.GetBounds();
visibleRect.MoveBy(-GetTranslationForThebesLayer(data->mLayer));
colorLayer->SetBounds(visibleRect);
layer = colorLayer;
}
NS_ASSERTION(!mNewChildLayers.Contains(layer), "Layer already in list???");
AutoLayersArray::index_type index = mNewChildLayers.IndexOf(data->mLayer);
NS_ASSERTION(index != AutoLayersArray::NoIndex, "Thebes layer not found?");
mNewChildLayers.InsertElementAt(index + 1, layer);
// Hide the ThebesLayer. We leave it in the layer tree so that we
// can find and recycle it later.
nsIntRect emptyRect;
data->mLayer->SetClipRect(&emptyRect);
data->mLayer->SetVisibleRegion(nsIntRegion());
} else {
layer = data->mLayer;
imageContainer = nullptr;
layer->SetClipRect(nullptr);
}
gfxMatrix transform;
if (!layer->GetTransform().Is2D(&transform)) {
NS_ERROR("Only 2D transformations currently supported");
}
// ImageLayers are already configured with a visible region
if (!imageContainer) {
NS_ASSERTION(!transform.HasNonIntegerTranslation(),
"Matrix not just an integer translation?");
// Convert from relative to the container to relative to the
// ThebesLayer itself.
nsIntRegion rgn = data->mVisibleRegion;
rgn.MoveBy(-GetTranslationForThebesLayer(data->mLayer));
layer->SetVisibleRegion(rgn);
}
nsIntRegion transparentRegion;
transparentRegion.Sub(data->mVisibleRegion, data->mOpaqueRegion);
bool isOpaque = transparentRegion.IsEmpty();
// For translucent ThebesLayers, try to find an opaque background
// color that covers the entire area beneath it so we can pull that
// color into this layer to make it opaque.
if (layer == data->mLayer) {
nscolor backgroundColor = NS_RGBA(0,0,0,0);
if (!isOpaque) {
backgroundColor = FindOpaqueBackgroundColorFor(lastIndex);
if (NS_GET_A(backgroundColor) == 255) {
isOpaque = true;
}
}
// Store the background color
ThebesDisplayItemLayerUserData* userData =
GetThebesDisplayItemLayerUserData(data->mLayer);
NS_ASSERTION(userData, "where did our user data go?");
if (userData->mForcedBackgroundColor != backgroundColor) {
// Invalidate the entire target ThebesLayer since we're changing
// the background color
data->mLayer->InvalidateRegion(data->mLayer->GetValidRegion());
}
userData->mForcedBackgroundColor = backgroundColor;
// use a mask layer for rounded rect clipping
int32_t commonClipCount = data->mCommonClipCount;
NS_ASSERTION(commonClipCount >= 0, "Inconsistent clip count.");
SetupMaskLayer(layer, data->mItemClip, commonClipCount);
// copy commonClipCount to the entry
FrameLayerBuilder::ThebesLayerItemsEntry* entry = mLayerBuilder->
GetThebesLayerItemsEntry(static_cast<ThebesLayer*>(layer.get()));
entry->mCommonClipCount = commonClipCount;
} else {
// mask layer for image and color layers
SetupMaskLayer(layer, data->mItemClip);
}
uint32_t flags;
if (isOpaque && !data->mForceTransparentSurface) {
flags = Layer::CONTENT_OPAQUE;
} else if (data->mNeedComponentAlpha) {
flags = Layer::CONTENT_COMPONENT_ALPHA;
} else {
flags = 0;
}
layer->SetContentFlags(flags);
if (lastIndex > 0) {
// Since we're going to pop off the last ThebesLayerData, the
// mVisibleAboveRegion of the second-to-last item will need to include
// the regions of the last item.
ThebesLayerData* nextData = mThebesLayerDataStack[lastIndex - 1];
nextData->mVisibleAboveRegion.Or(nextData->mVisibleAboveRegion,
data->mVisibleAboveRegion);
nextData->mVisibleAboveRegion.Or(nextData->mVisibleAboveRegion,
data->mVisibleRegion);
nextData->mVisibleAboveRegion.SimplifyOutward(4);
nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion,
data->mDrawAboveRegion);
nextData->mDrawAboveRegion.Or(nextData->mDrawAboveRegion,
data->mDrawRegion);
nextData->mDrawAboveRegion.SimplifyOutward(4);
}
mThebesLayerDataStack.RemoveElementAt(lastIndex);
}
static bool
SuppressComponentAlpha(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
const nsRect& aComponentAlphaBounds)
{
const nsRegion* windowTransparentRegion = aBuilder->GetFinalTransparentRegion();
if (!windowTransparentRegion || windowTransparentRegion->IsEmpty())
return false;
// Suppress component alpha for items in the toplevel window that are over
// the window translucent area
nsIFrame* f = aItem->Frame();
nsIFrame* ref = aBuilder->RootReferenceFrame();
if (f->PresContext() != ref->PresContext())
return false;
for (nsIFrame* t = f; t; t = t->GetParent()) {
if (t->IsTransformed())
return false;
}
return windowTransparentRegion->Intersects(aComponentAlphaBounds);
}
static bool
WindowHasTransparency(nsDisplayListBuilder* aBuilder)
{
const nsRegion* windowTransparentRegion = aBuilder->GetFinalTransparentRegion();
return windowTransparentRegion && !windowTransparentRegion->IsEmpty();
}
void
ContainerState::ThebesLayerData::Accumulate(ContainerState* aState,
nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
const DisplayItemClip& aClip)
{
if (aState->mBuilder->NeedToForceTransparentSurfaceForItem(aItem)) {
mForceTransparentSurface = true;
}
if (aState->mParameters.mDisableSubpixelAntialiasingInDescendants) {
// Disable component alpha.
// Note that the transform (if any) on the ThebesLayer is always an integer translation so
// we don't have to factor that in here.
aItem->DisableComponentAlpha();
}
/* Mark as available for conversion to image layer if this is a nsDisplayImage and
* we are the first visible item in the ThebesLayerData object.
*/
if (mVisibleRegion.IsEmpty() &&
aItem->SupportsOptimizingToImage()) {
mImage = static_cast<nsDisplayImageContainer*>(aItem);
} else {
mImage = nullptr;
}
mItemClip = aClip;
if (!mIsSolidColorInVisibleRegion && mOpaqueRegion.Contains(aDrawRect) &&
mVisibleRegion.Contains(aVisibleRect)) {
// A very common case! Most pages have a ThebesLayer with the page
// background (opaque) visible and most or all of the page content over the
// top of that background.
// The rest of this method won't do anything. mVisibleRegion, mOpaqueRegion
// and mDrawRegion don't need updating. mVisibleRegion contains aVisibleRect
// already, mOpaqueRegion contains aDrawRect and therefore whatever
// the opaque region of the item is. mDrawRegion must contain mOpaqueRegion
// and therefore aDrawRect.
NS_ASSERTION(mDrawRegion.Contains(aDrawRect), "Draw region not covered");
return;
}
nscolor uniformColor;
bool isUniform = aItem->IsUniform(aState->mBuilder, &uniformColor);
// Some display items have to exist (so they can set forceTransparentSurface
// below) but don't draw anything. They'll return true for isUniform but
// a color with opacity 0.
if (!isUniform || NS_GET_A(uniformColor) > 0) {
// Make sure that the visible area is covered by uniform pixels. In
// particular this excludes cases where the edges of the item are not
// pixel-aligned (thus the item will not be truly uniform).
if (isUniform) {
bool snap;
nsRect bounds = aItem->GetBounds(aState->mBuilder, &snap);
if (!aState->ScaleToInsidePixels(bounds, snap).Contains(aVisibleRect)) {
isUniform = false;
}
}
if (isUniform && aClip.GetRoundedRectCount() == 0) {
if (mVisibleRegion.IsEmpty()) {
// This color is all we have
mSolidColor = uniformColor;
mIsSolidColorInVisibleRegion = true;
} else if (mIsSolidColorInVisibleRegion &&
mVisibleRegion.IsEqual(nsIntRegion(aVisibleRect))) {
// we can just blend the colors together
mSolidColor = NS_ComposeColors(mSolidColor, uniformColor);
} else {
mIsSolidColorInVisibleRegion = false;
}
} else {
mIsSolidColorInVisibleRegion = false;
}
mVisibleRegion.Or(mVisibleRegion, aVisibleRect);
mVisibleRegion.SimplifyOutward(4);
mDrawRegion.Or(mDrawRegion, aDrawRect);
mDrawRegion.SimplifyOutward(4);
}
bool snap;
nsRegion opaque = aItem->GetOpaqueRegion(aState->mBuilder, &snap);
if (!opaque.IsEmpty()) {
nsRegion opaqueClipped;
nsRegionRectIterator iter(opaque);
for (const nsRect* r = iter.Next(); r; r = iter.Next()) {
opaqueClipped.Or(opaqueClipped, aClip.ApproximateIntersectInward(*r));
}
nsIntRegion opaquePixels = aState->ScaleRegionToInsidePixels(opaqueClipped, snap);
nsIntRegionRectIterator iter2(opaquePixels);
for (const nsIntRect* r = iter2.Next(); r; r = iter2.Next()) {
// We don't use SimplifyInward here since it's not defined exactly
// what it will discard. For our purposes the most important case
// is a large opaque background at the bottom of z-order (e.g.,
// a canvas background), so we need to make sure that the first rect
// we see doesn't get discarded.
nsIntRegion tmp;
tmp.Or(mOpaqueRegion, *r);
// Opaque display items in chrome documents whose window is partially
// transparent are always added to the opaque region. This helps ensure
// that we get as much subpixel-AA as possible in the chrome.
if (tmp.GetNumRects() <= 4 ||
(WindowHasTransparency(aState->mBuilder) &&
aItem->Frame()->PresContext()->IsChrome())) {
mOpaqueRegion = tmp;
}
}
}
if (!aState->mParameters.mDisableSubpixelAntialiasingInDescendants) {
nsRect componentAlpha = aItem->GetComponentAlphaBounds(aState->mBuilder);
if (!componentAlpha.IsEmpty()) {
nsIntRect componentAlphaRect =
aState->ScaleToOutsidePixels(componentAlpha, false).Intersect(aVisibleRect);
if (!mOpaqueRegion.Contains(componentAlphaRect)) {
if (SuppressComponentAlpha(aState->mBuilder, aItem, componentAlpha)) {
aItem->DisableComponentAlpha();
} else {
mNeedComponentAlpha = true;
}
}
}
}
}
ContainerState::ThebesLayerData*
ContainerState::FindThebesLayerFor(nsDisplayItem* aItem,
const nsIntRect& aVisibleRect,
const nsIntRect& aDrawRect,
const DisplayItemClip& aClip,
const nsIFrame* aActiveScrolledRoot,
const nsPoint& aTopLeft)
{
int32_t i;
int32_t lowestUsableLayerWithScrolledRoot = -1;
int32_t topmostLayerWithScrolledRoot = -1;
for (i = mThebesLayerDataStack.Length() - 1; i >= 0; --i) {
ThebesLayerData* data = mThebesLayerDataStack[i];
if (data->mDrawAboveRegion.Intersects(aVisibleRect)) {
++i;
break;
}
if (data->mActiveScrolledRoot == aActiveScrolledRoot) {
lowestUsableLayerWithScrolledRoot = i;
if (topmostLayerWithScrolledRoot < 0) {
topmostLayerWithScrolledRoot = i;
}
}
if (data->mDrawRegion.Intersects(aVisibleRect))
break;
}
if (topmostLayerWithScrolledRoot < 0) {
--i;
for (; i >= 0; --i) {
ThebesLayerData* data = mThebesLayerDataStack[i];
if (data->mActiveScrolledRoot == aActiveScrolledRoot) {
topmostLayerWithScrolledRoot = i;
break;
}
}
}
if (topmostLayerWithScrolledRoot >= 0) {
while (uint32_t(topmostLayerWithScrolledRoot + 1) < mThebesLayerDataStack.Length()) {
PopThebesLayerData();
}
}
nsRefPtr<ThebesLayer> layer;
ThebesLayerData* thebesLayerData = nullptr;
if (lowestUsableLayerWithScrolledRoot < 0) {
layer = CreateOrRecycleThebesLayer(aActiveScrolledRoot, aItem->ReferenceFrame(), aTopLeft);
NS_ASSERTION(!mNewChildLayers.Contains(layer), "Layer already in list???");
mNewChildLayers.AppendElement(layer);
thebesLayerData = new ThebesLayerData();
mThebesLayerDataStack.AppendElement(thebesLayerData);
thebesLayerData->mLayer = layer;
thebesLayerData->mActiveScrolledRoot = aActiveScrolledRoot;
} else {
thebesLayerData = mThebesLayerDataStack[lowestUsableLayerWithScrolledRoot];
layer = thebesLayerData->mLayer;
}
// check to see if the new item has rounded rect clips in common with
// other items in the layer
thebesLayerData->UpdateCommonClipCount(aClip);
thebesLayerData->Accumulate(this, aItem, aVisibleRect, aDrawRect, aClip);
return thebesLayerData;
}
#ifdef MOZ_DUMP_PAINTING
static void
DumpPaintedImage(nsDisplayItem* aItem, gfxASurface* aSurf)
{
nsCString string(aItem->Name());
string.Append("-");
string.AppendInt((uint64_t)aItem);
fprintf(gfxUtils::sDumpPaintFile, "array[\"%s\"]=\"", string.BeginReading());
aSurf->DumpAsDataURL(gfxUtils::sDumpPaintFile);
fprintf(gfxUtils::sDumpPaintFile, "\";");
}
#endif
static void
PaintInactiveLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
nsDisplayItem* aItem,
gfxContext* aContext,
nsRenderingContext* aCtx)
{
// This item has an inactive layer. Render it to a ThebesLayer
// using a temporary BasicLayerManager.
BasicLayerManager* basic = static_cast<BasicLayerManager*>(aManager);
nsRefPtr<gfxContext> context = aContext;
#ifdef MOZ_DUMP_PAINTING
int32_t appUnitsPerDevPixel = AppUnitsPerDevPixel(aItem);
nsIntRect itemVisibleRect =
aItem->GetVisibleRect().ToOutsidePixels(appUnitsPerDevPixel);
nsRefPtr<gfxASurface> surf;
if (gfxUtils::sDumpPainting) {
surf = gfxPlatform::GetPlatform()->CreateOffscreenSurface(itemVisibleRect.Size(),
GFX_CONTENT_COLOR_ALPHA);
surf->SetDeviceOffset(-itemVisibleRect.TopLeft());
context = new gfxContext(surf);
}
#endif
basic->SetTarget(context);
if (aItem->GetType() == nsDisplayItem::TYPE_SVG_EFFECTS) {
static_cast<nsDisplaySVGEffects*>(aItem)->PaintAsLayer(aBuilder, aCtx, basic);
if (basic->InTransaction()) {
basic->AbortTransaction();
}
} else {
basic->EndTransaction(FrameLayerBuilder::DrawThebesLayer, aBuilder);
}
FrameLayerBuilder *builder = static_cast<FrameLayerBuilder*>(basic->GetUserData(&gLayerManagerLayerBuilder));
if (builder) {
builder->DidEndTransaction();
}
basic->SetTarget(nullptr);
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPainting) {
DumpPaintedImage(aItem, surf);
surf->SetDeviceOffset(gfxPoint(0, 0));
aContext->SetSource(surf, itemVisibleRect.TopLeft());
aContext->Rectangle(itemVisibleRect);
aContext->Fill();
aItem->SetPainted();
}
#endif
}
/**
* Chooses a single active scrolled root for the entire display list, used
* when we are flattening layers.
*/
bool
ContainerState::ChooseActiveScrolledRoot(const nsDisplayList& aList,
const nsIFrame **aActiveScrolledRoot)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
LayerState layerState = item->GetLayerState(mBuilder, mManager, mParameters);
// Don't use an item that won't be part of any ThebesLayers to pick the
// active scrolled root.
if (layerState == LAYER_ACTIVE_FORCE) {
continue;
}
// Try using the actual active scrolled root of the backmost item, as that
// should result in the least invalidation when scrolling.
mBuilder->IsFixedItem(item, aActiveScrolledRoot);
if (*aActiveScrolledRoot) {
return true;
}
}
return false;
}
/*
* Iterate through the non-clip items in aList and its descendants.
* For each item we compute the effective clip rect. Each item is assigned
* to a layer. We invalidate the areas in ThebesLayers where an item
* has moved from one ThebesLayer to another. Also,
* aState->mInvalidThebesContent is invalidated in every ThebesLayer.
* We set the clip rect for items that generated their own layer, and
* create a mask layer to do any rounded rect clipping.
* (ThebesLayers don't need a clip rect on the layer, we clip the items
* individually when we draw them.)
* We set the visible rect for all layers, although the actual setting
* of visible rects for some ThebesLayers is deferred until the calling
* of ContainerState::Finish.
*/
void
ContainerState::ProcessDisplayItems(const nsDisplayList& aList,
uint32_t aFlags)
{
PROFILER_LABEL("ContainerState", "ProcessDisplayItems");
const nsIFrame* lastActiveScrolledRoot = nullptr;
nsPoint topLeft;
// When NO_COMPONENT_ALPHA is set, items will be flattened into a single
// layer, so we need to choose which active scrolled root to use for all
// items.
if (aFlags & NO_COMPONENT_ALPHA) {
if (!ChooseActiveScrolledRoot(aList, &lastActiveScrolledRoot)) {
lastActiveScrolledRoot = mContainerReferenceFrame;
}
topLeft = lastActiveScrolledRoot->GetOffsetToCrossDoc(mContainerReferenceFrame);
}
int32_t maxLayers = nsDisplayItem::MaxActiveLayers();
int layerCount = 0;
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
NS_ASSERTION(mAppUnitsPerDevPixel == AppUnitsPerDevPixel(item),
"items in a container layer should all have the same app units per dev pixel");
nsIntRect itemVisibleRect =
ScaleToOutsidePixels(item->GetVisibleRect(), false);
bool snap;
nsRect itemContent = item->GetBounds(mBuilder, &snap);
nsIntRect itemDrawRect = ScaleToOutsidePixels(itemContent, snap);
nsIntRect clipRect;
const DisplayItemClip& itemClip = item->GetClip();
if (itemClip.HasClip()) {
itemContent.IntersectRect(itemContent, itemClip.GetClipRect());
clipRect = ScaleToNearestPixels(itemClip.GetClipRect());
itemDrawRect.IntersectRect(itemDrawRect, clipRect);
clipRect.MoveBy(mParameters.mOffset);
}
mBounds.UnionRect(mBounds, itemContent);
itemVisibleRect.IntersectRect(itemVisibleRect, itemDrawRect);
LayerState layerState = item->GetLayerState(mBuilder, mManager, mParameters);
if (layerState == LAYER_INACTIVE &&
nsDisplayItem::ForceActiveLayers()) {
layerState = LAYER_ACTIVE;
}
bool isFixed;
bool forceInactive;
const nsIFrame* activeScrolledRoot;
if (aFlags & NO_COMPONENT_ALPHA) {
forceInactive = true;
activeScrolledRoot = lastActiveScrolledRoot;
isFixed = mBuilder->IsFixedItem(item, nullptr, activeScrolledRoot);
} else {
forceInactive = false;
isFixed = mBuilder->IsFixedItem(item, &activeScrolledRoot);
if (activeScrolledRoot != lastActiveScrolledRoot) {
lastActiveScrolledRoot = activeScrolledRoot;
topLeft = activeScrolledRoot->GetOffsetToCrossDoc(mContainerReferenceFrame);
}
}
if (maxLayers != -1 && layerCount >= maxLayers) {
forceInactive = true;
}
// Assign the item to a layer
if (layerState == LAYER_ACTIVE_FORCE ||
(layerState == LAYER_INACTIVE && !mManager->IsWidgetLayerManager()) ||
(!forceInactive &&
(layerState == LAYER_ACTIVE_EMPTY ||
layerState == LAYER_ACTIVE))) {
layerCount++;
// LAYER_ACTIVE_EMPTY means the layer is created just for its metadata.
// We should never see an empty layer with any visible content!
NS_ASSERTION(layerState != LAYER_ACTIVE_EMPTY ||
itemVisibleRect.IsEmpty(),
"State is LAYER_ACTIVE_EMPTY but visible rect is not.");
// As long as the new layer isn't going to be a ThebesLayer,
// InvalidateForLayerChange doesn't need the new layer pointer.
// We also need to check the old data now, because BuildLayer
// can overwrite it.
InvalidateForLayerChange(item, nullptr, itemClip, topLeft, nullptr);
// If the item would have its own layer but is invisible, just hide it.
// Note that items without their own layers can't be skipped this
// way, since their ThebesLayer may decide it wants to draw them
// into its buffer even if they're currently covered.
if (itemVisibleRect.IsEmpty() &&
!item->ShouldBuildLayerEvenIfInvisible(mBuilder)) {
continue;
}
nsDisplayItem::Type type = item->GetType();
bool setVisibleRegion = type != nsDisplayItem::TYPE_TRANSFORM;
if (setVisibleRegion) {
mParameters.mAncestorClipRect = nullptr;
} else {
mParameters.mAncestorClipRect = itemClip.HasClip() ? &clipRect : nullptr;
}
// Just use its layer.
nsRefPtr<Layer> ownLayer = item->BuildLayer(mBuilder, mManager, mParameters);
if (!ownLayer) {
continue;
}
NS_ASSERTION(!ownLayer->AsThebesLayer(),
"Should never have created a dedicated Thebes layer!");
nsRect invalid;
if (item->IsInvalid(invalid)) {
ownLayer->SetInvalidRectToVisibleRegion();
}
// If it's not a ContainerLayer, we need to apply the scale transform
// ourselves.
if (!ownLayer->AsContainerLayer()) {
ownLayer->SetPostScale(mParameters.mXScale,
mParameters.mYScale);
}
ownLayer->SetIsFixedPosition(isFixed);
// Update that layer's clip and visible rects.
NS_ASSERTION(ownLayer->Manager() == mManager, "Wrong manager");
NS_ASSERTION(!ownLayer->HasUserData(&gLayerManagerUserData),
"We shouldn't have a FrameLayerBuilder-managed layer here!");
NS_ASSERTION(itemClip.HasClip() ||
itemClip.GetRoundedRectCount() == 0,
"If we have rounded rects, we must have a clip rect");
// It has its own layer. Update that layer's clip and visible rects.
if (itemClip.HasClip()) {
ownLayer->SetClipRect(&clipRect);
} else {
ownLayer->SetClipRect(nullptr);
}
ThebesLayerData* data = GetTopThebesLayerData();
if (data) {
data->mVisibleAboveRegion.Or(data->mVisibleAboveRegion, itemVisibleRect);
data->mVisibleAboveRegion.SimplifyOutward(4);
// Add the entire bounds rect to the mDrawAboveRegion.
// The visible region may be excluding opaque content above the
// item, and we need to ensure that that content is not placed
// in a ThebesLayer below the item!
data->mDrawAboveRegion.Or(data->mDrawAboveRegion, itemDrawRect);
data->mDrawAboveRegion.SimplifyOutward(4);
}
itemVisibleRect.MoveBy(mParameters.mOffset);
if (setVisibleRegion) {
SetVisibleRegionForLayer(ownLayer, ownLayer->GetVisibleRegion(), itemVisibleRect);
}
// rounded rectangle clipping using mask layers
// (must be done after visible rect is set on layer)
if (itemClip.IsRectClippedByRoundedCorner(itemContent)) {
SetupMaskLayer(ownLayer, itemClip);
}
ContainerLayer* oldContainer = ownLayer->GetParent();
if (oldContainer && oldContainer != mContainerLayer) {
oldContainer->RemoveChild(ownLayer);
}
NS_ASSERTION(!mNewChildLayers.Contains(ownLayer),
"Layer already in list???");
mNewChildLayers.AppendElement(ownLayer);
/**
* No need to allocate geometry for items that aren't
* part of a ThebesLayer.
*/
nsAutoPtr<nsDisplayItemGeometry> dummy;
mLayerBuilder->AddLayerDisplayItem(ownLayer, item,
itemClip, layerState,
topLeft, nullptr,
dummy);
} else {
ThebesLayerData* data =
FindThebesLayerFor(item, itemVisibleRect, itemDrawRect, itemClip,
activeScrolledRoot, topLeft);
data->mLayer->SetIsFixedPosition(isFixed);
nsAutoPtr<nsDisplayItemGeometry> geometry(item->AllocateGeometry(mBuilder));
InvalidateForLayerChange(item, data->mLayer, itemClip, topLeft, geometry);
mLayerBuilder->AddThebesDisplayItem(data->mLayer, item, itemClip,
mContainerFrame,
layerState, topLeft,
geometry);
// check to see if the new item has rounded rect clips in common with
// other items in the layer
data->UpdateCommonClipCount(itemClip);
}
}
}
void
ContainerState::InvalidateForLayerChange(nsDisplayItem* aItem,
Layer* aNewLayer,
const DisplayItemClip& aClip,
const nsPoint& aTopLeft,
nsDisplayItemGeometry *aGeometry)
{
NS_ASSERTION(aItem->GetPerFrameKey(),
"Display items that render using Thebes must have a key");
nsDisplayItemGeometry *oldGeometry = nullptr;
DisplayItemClip* oldClip = nullptr;
nsAutoTArray<nsIFrame*,4> changedFrames;
bool isInvalid = false;
Layer* oldLayer = mLayerBuilder->GetOldLayerFor(aItem, &oldGeometry, &oldClip, &changedFrames, &isInvalid);
if (aNewLayer != oldLayer && oldLayer) {
// The item has changed layers.
// Invalidate the old bounds in the old layer and new bounds in the new layer.
ThebesLayer* t = oldLayer->AsThebesLayer();
if (t) {
// Note that whenever the layer's scale changes, we invalidate the whole thing,
// so it doesn't matter whether we are using the old scale at last paint
// or a new scale here
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Display item type %s(%p) changed layers %p to %p!\n", aItem->Name(), aItem->Frame(), t, aNewLayer);
}
#endif
InvalidatePostTransformRegion(t,
oldGeometry->ComputeInvalidationRegion(),
*oldClip,
mLayerBuilder->GetLastPaintOffset(t));
}
if (aNewLayer) {
ThebesLayer* newThebesLayer = aNewLayer->AsThebesLayer();
if (newThebesLayer) {
InvalidatePostTransformRegion(newThebesLayer,
aGeometry->ComputeInvalidationRegion(),
aClip,
GetTranslationForThebesLayer(newThebesLayer));
}
}
aItem->NotifyRenderingChanged();
return;
}
if (!aNewLayer) {
return;
}
ThebesLayer* newThebesLayer = aNewLayer->AsThebesLayer();
if (!newThebesLayer) {
return;
}
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>(newThebesLayer->GetUserData(&gThebesDisplayItemLayerUserData));
// If the frame is marked as invalidated, and didn't specify a rect to invalidate then we want to
// invalidate both the old and new bounds, otherwise we only want to invalidate the changed areas.
// If we do get an invalid rect, then we want to add this on top of the change areas.
nsRect invalid;
nsRegion combined;
nsPoint shift = aTopLeft - data->mLastActiveScrolledRootOrigin;
if (!oldLayer) {
// This item is being added for the first time, invalidate its entire area.
//TODO: We call GetGeometry again in AddThebesDisplayItem, we should reuse this.
combined = aClip.ApplyNonRoundedIntersection(aGeometry->ComputeInvalidationRegion());
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Display item type %s(%p) added to layer %p!\n", aItem->Name(), aItem->Frame(), aNewLayer);
}
#endif
} else if (isInvalid || (aItem->IsInvalid(invalid) && invalid.IsEmpty())) {
// Either layout marked item as needing repainting, invalidate the entire old and new areas.
combined = oldClip->ApplyNonRoundedIntersection(oldGeometry->ComputeInvalidationRegion());
combined.MoveBy(shift);
combined.Or(combined, aClip.ApplyNonRoundedIntersection(aGeometry->ComputeInvalidationRegion()));
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Display item type %s(%p) (in layer %p) belongs to an invalidated frame!\n", aItem->Name(), aItem->Frame(), aNewLayer);
}
#endif
} else {
// Let the display item check for geometry changes and decide what needs to be
// repainted.
oldGeometry->MoveBy(shift);
aItem->ComputeInvalidationRegion(mBuilder, oldGeometry, &combined);
oldClip->AddOffsetAndComputeDifference(shift, oldGeometry->ComputeInvalidationRegion(),
aClip, aGeometry->ComputeInvalidationRegion(),
&combined);
// Add in any rect that the frame specified
combined.Or(combined, invalid);
for (uint32_t i = 0; i < changedFrames.Length(); i++) {
combined.Or(combined, changedFrames[i]->GetVisualOverflowRect());
}
// Restrict invalidation to the clipped region
nsRegion clip;
if (aClip.ComputeRegionInClips(oldClip, shift, &clip)) {
combined.And(combined, clip);
}
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
if (!combined.IsEmpty()) {
printf("Display item type %s(%p) (in layer %p) changed geometry!\n", aItem->Name(), aItem->Frame(), aNewLayer);
}
}
#endif
}
if (!combined.IsEmpty()) {
aItem->NotifyRenderingChanged();
InvalidatePostTransformRegion(newThebesLayer,
combined.ScaleToOutsidePixels(data->mXScale, data->mYScale, mAppUnitsPerDevPixel),
GetTranslationForThebesLayer(newThebesLayer));
}
}
void
FrameLayerBuilder::AddThebesDisplayItem(ThebesLayer* aLayer,
nsDisplayItem* aItem,
const DisplayItemClip& aClip,
nsIFrame* aContainerLayerFrame,
LayerState aLayerState,
const nsPoint& aTopLeft,
nsAutoPtr<nsDisplayItemGeometry> aGeometry)
{
ThebesDisplayItemLayerUserData* thebesData =
static_cast<ThebesDisplayItemLayerUserData*>(aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
nsRefPtr<LayerManager> tempManager;
nsIntRect intClip;
bool hasClip = false;
if (aLayerState != LAYER_NONE) {
DisplayItemData *data = GetDisplayItemDataForManager(aItem, aLayer->Manager());
if (data) {
tempManager = data->mInactiveManager;
}
if (!tempManager) {
tempManager = new BasicLayerManager();
}
// We need to grab these before calling AddLayerDisplayItem because it will overwrite them.
nsRegion clip;
DisplayItemClip* oldClip = nullptr;
GetOldLayerFor(aItem, nullptr, &oldClip);
hasClip = aClip.ComputeRegionInClips(oldClip,
aTopLeft - thebesData->mLastActiveScrolledRootOrigin,
&clip);
if (hasClip) {
intClip = clip.GetBounds().ScaleToOutsidePixels(thebesData->mXScale,
thebesData->mYScale,
thebesData->mAppUnitsPerDevPixel);
}
}
AddLayerDisplayItem(aLayer, aItem, aClip, aLayerState, aTopLeft, tempManager, aGeometry);
ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer);
if (entry) {
entry->mContainerLayerFrame = aContainerLayerFrame;
if (entry->mContainerLayerGeneration == 0) {
entry->mContainerLayerGeneration = mContainerLayerGeneration;
}
if (tempManager) {
FrameLayerBuilder* layerBuilder = new FrameLayerBuilder();
layerBuilder->Init(mDisplayListBuilder, tempManager);
tempManager->BeginTransaction();
if (mRetainingManager) {
layerBuilder->DidBeginRetainedLayerTransaction(tempManager);
}
nsAutoPtr<LayerProperties> props(LayerProperties::CloneFrom(tempManager->GetRoot()));
nsRefPtr<Layer> layer =
aItem->BuildLayer(mDisplayListBuilder, tempManager, FrameLayerBuilder::ContainerParameters());
// We have no easy way of detecting if this transaction will ever actually get finished.
// For now, I've just silenced the warning with nested transactions in BasicLayers.cpp
if (!layer) {
tempManager->EndTransaction(nullptr, nullptr);
tempManager->SetUserData(&gLayerManagerLayerBuilder, nullptr);
return;
}
// If BuildLayer didn't call BuildContainerLayerFor, then our new layer won't have been
// stored in layerBuilder. Manually add it now.
if (mRetainingManager) {
#ifdef DEBUG_DISPLAY_ITEM_DATA
LayerManagerData* parentLmd = static_cast<LayerManagerData*>
(aLayer->Manager()->GetUserData(&gLayerManagerUserData));
LayerManagerData* lmd = static_cast<LayerManagerData*>
(tempManager->GetUserData(&gLayerManagerUserData));
lmd->mParent = parentLmd;
#endif
layerBuilder->StoreDataForFrame(aItem, layer, LAYER_ACTIVE);
}
tempManager->SetRoot(layer);
layerBuilder->WillEndTransaction();
nsIntPoint offset = GetLastPaintOffset(aLayer) - GetTranslationForThebesLayer(aLayer);
props->MoveBy(-offset);
nsIntRegion invalid = props->ComputeDifferences(layer, nullptr);
if (aLayerState == LAYER_SVG_EFFECTS) {
invalid = nsSVGIntegrationUtils::AdjustInvalidAreaForSVGEffects(aItem->Frame(),
aItem->ToReferenceFrame(),
invalid.GetBounds());
}
if (!invalid.IsEmpty()) {
#ifdef MOZ_DUMP_PAINTING
if (nsLayoutUtils::InvalidationDebuggingIsEnabled()) {
printf("Inactive LayerManager(%p) for display item %s(%p) has an invalid region - invalidating layer %p\n", tempManager.get(), aItem->Name(), aItem->Frame(), aLayer);
}
#endif
if (hasClip) {
invalid.And(invalid, intClip);
}
invalid.ScaleRoundOut(thebesData->mXScale, thebesData->mYScale);
InvalidatePostTransformRegion(aLayer, invalid,
GetTranslationForThebesLayer(aLayer));
}
}
ClippedDisplayItem* cdi =
entry->mItems.AppendElement(ClippedDisplayItem(aItem,
mContainerLayerGeneration));
cdi->mInactiveLayerManager = tempManager;
}
}
FrameLayerBuilder::DisplayItemData*
FrameLayerBuilder::StoreDataForFrame(nsDisplayItem* aItem, Layer* aLayer, LayerState aState)
{
DisplayItemData* oldData = GetDisplayItemDataForManager(aItem, mRetainingManager);
if (oldData) {
if (!oldData->mUsed) {
oldData->UpdateContents(aLayer, aState, mContainerLayerGeneration, aItem);
}
return oldData;
}
LayerManagerData* lmd = static_cast<LayerManagerData*>
(mRetainingManager->GetUserData(&gLayerManagerUserData));
nsRefPtr<DisplayItemData> data =
new DisplayItemData(lmd, aItem->GetPerFrameKey(),
aLayer, aState, mContainerLayerGeneration);
data->AddFrame(aItem->Frame());
nsAutoTArray<nsIFrame*,4> mergedFrames;
aItem->GetMergedFrames(&mergedFrames);
for (uint32_t i = 0; i < mergedFrames.Length(); ++i) {
data->AddFrame(mergedFrames[i]);
}
lmd->mDisplayItems.PutEntry(data);
return data;
}
void
FrameLayerBuilder::StoreDataForFrame(nsIFrame* aFrame,
uint32_t aDisplayItemKey,
Layer* aLayer,
LayerState aState)
{
DisplayItemData* oldData = GetDisplayItemData(aFrame, aDisplayItemKey);
if (oldData && oldData->mFrameList.Length() == 1) {
oldData->UpdateContents(aLayer, aState, mContainerLayerGeneration);
return;
}
LayerManagerData* lmd = static_cast<LayerManagerData*>
(mRetainingManager->GetUserData(&gLayerManagerUserData));
nsRefPtr<DisplayItemData> data =
new DisplayItemData(lmd, aDisplayItemKey, aLayer,
aState, mContainerLayerGeneration);
data->AddFrame(aFrame);
lmd->mDisplayItems.PutEntry(data);
}
FrameLayerBuilder::ClippedDisplayItem::~ClippedDisplayItem()
{
if (mInactiveLayerManager) {
// We always start a transaction during layer construction for all inactive
// layers, but we don't necessarily call EndTransaction during painting.
// If the transaaction is still open, end it to avoid assertions.
BasicLayerManager* basic = static_cast<BasicLayerManager*>(mInactiveLayerManager.get());
if (basic->InTransaction()) {
basic->EndTransaction(nullptr, nullptr);
}
basic->SetUserData(&gLayerManagerLayerBuilder, nullptr);
}
}
void
FrameLayerBuilder::AddLayerDisplayItem(Layer* aLayer,
nsDisplayItem* aItem,
const DisplayItemClip& aClip,
LayerState aLayerState,
const nsPoint& aTopLeft,
LayerManager* aManager,
nsAutoPtr<nsDisplayItemGeometry> aGeometry)
{
if (aLayer->Manager() != mRetainingManager)
return;
DisplayItemData *data = StoreDataForFrame(aItem, aLayer, aLayerState);
ThebesLayer *t = aLayer->AsThebesLayer();
if (t) {
data->mGeometry = aGeometry;
data->mClip = aClip;
}
data->mInactiveManager = aManager;
}
nsIntPoint
FrameLayerBuilder::GetLastPaintOffset(ThebesLayer* aLayer)
{
ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer);
if (entry) {
if (entry->mContainerLayerGeneration == 0) {
entry->mContainerLayerGeneration = mContainerLayerGeneration;
}
if (entry->mHasExplicitLastPaintOffset)
return entry->mLastPaintOffset;
}
return GetTranslationForThebesLayer(aLayer);
}
void
FrameLayerBuilder::SaveLastPaintOffset(ThebesLayer* aLayer)
{
ThebesLayerItemsEntry* entry = mThebesLayerItems.PutEntry(aLayer);
if (entry) {
if (entry->mContainerLayerGeneration == 0) {
entry->mContainerLayerGeneration = mContainerLayerGeneration;
}
entry->mLastPaintOffset = GetTranslationForThebesLayer(aLayer);
entry->mHasExplicitLastPaintOffset = true;
}
}
void
ContainerState::CollectOldLayers()
{
for (Layer* layer = mContainerLayer->GetFirstChild(); layer;
layer = layer->GetNextSibling()) {
NS_ASSERTION(!layer->HasUserData(&gMaskLayerUserData),
"Mask layer in layer tree; could not be recycled.");
if (layer->HasUserData(&gThebesDisplayItemLayerUserData)) {
NS_ASSERTION(layer->AsThebesLayer(), "Wrong layer type");
mRecycledThebesLayers.AppendElement(static_cast<ThebesLayer*>(layer));
}
if (Layer* maskLayer = layer->GetMaskLayer()) {
NS_ASSERTION(maskLayer->GetType() == Layer::TYPE_IMAGE,
"Could not recycle mask layer, unsupported layer type.");
mRecycledMaskImageLayers.Put(layer, static_cast<ImageLayer*>(maskLayer));
}
}
}
void
ContainerState::Finish(uint32_t* aTextContentFlags, LayerManagerData* aData)
{
while (!mThebesLayerDataStack.IsEmpty()) {
PopThebesLayerData();
}
uint32_t textContentFlags = 0;
// Make sure that current/existing layers are added to the parent and are
// in the correct order.
Layer* layer = nullptr;
for (uint32_t i = 0; i < mNewChildLayers.Length(); ++i) {
Layer* prevChild = i == 0 ? nullptr : mNewChildLayers[i - 1].get();
layer = mNewChildLayers[i];
if (!layer->GetVisibleRegion().IsEmpty()) {
textContentFlags |= layer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA;
}
if (!layer->GetParent()) {
// This is not currently a child of the container, so just add it
// now.
mContainerLayer->InsertAfter(layer, prevChild);
continue;
}
NS_ASSERTION(layer->GetParent() == mContainerLayer,
"Layer shouldn't be the child of some other container");
if (layer->GetPrevSibling() != prevChild) {
mContainerLayer->RepositionChild(layer, prevChild);
}
}
// Remove old layers that have become unused.
if (!layer) {
layer = mContainerLayer->GetFirstChild();
} else {
layer = layer->GetNextSibling();
}
while (layer) {
Layer *layerToRemove = layer;
layer = layer->GetNextSibling();
mContainerLayer->RemoveChild(layerToRemove);
}
*aTextContentFlags = textContentFlags;
}
static inline gfxSize RoundToFloatPrecision(const gfxSize& aSize)
{
return gfxSize(float(aSize.width), float(aSize.height));
}
static bool
ChooseScaleAndSetTransform(FrameLayerBuilder* aLayerBuilder,
nsDisplayListBuilder* aDisplayListBuilder,
nsIFrame* aContainerFrame,
const gfx3DMatrix* aTransform,
const FrameLayerBuilder::ContainerParameters& aIncomingScale,
ContainerLayer* aLayer,
LayerState aState,
FrameLayerBuilder::ContainerParameters& aOutgoingScale)
{
nsIntPoint offset;
gfx3DMatrix transform =
gfx3DMatrix::ScalingMatrix(aIncomingScale.mXScale, aIncomingScale.mYScale, 1.0);
if (aTransform) {
// aTransform is applied first, then the scale is applied to the result
transform = (*aTransform)*transform;
// Set any matrix entries close to integers to be those exact integers.
// This protects against floating-point inaccuracies causing problems
// in the checks below.
transform.NudgeToIntegers();
}
gfxMatrix transform2d;
if (aContainerFrame &&
(aState == LAYER_INACTIVE || aState == LAYER_SVG_EFFECTS) &&
(!aTransform || (aTransform->Is2D(&transform2d) &&
!transform2d.HasNonTranslation()))) {
// When we have an inactive ContainerLayer, translate the container by the offset to the
// reference frame (and offset all child layers by the reverse) so that the coordinate
// space of the child layers isn't affected by scrolling.
// This gets confusing for complicated transform (since we'd have to compute the scale
// factors for the matrix), so we don't bother. Any frames that are building an nsDisplayTransform
// for a css transform would have 0,0 as their offset to the reference frame, so this doesn't
// matter.
nsPoint appUnitOffset = aDisplayListBuilder->ToReferenceFrame(aContainerFrame);
nscoord appUnitsPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
offset = nsIntPoint(
NS_lround(NSAppUnitsToDoublePixels(appUnitOffset.x, appUnitsPerDevPixel)*aIncomingScale.mXScale),
NS_lround(NSAppUnitsToDoublePixels(appUnitOffset.y, appUnitsPerDevPixel)*aIncomingScale.mYScale));
}
transform = transform * gfx3DMatrix::Translation(offset.x + aIncomingScale.mOffset.x, offset.y + aIncomingScale.mOffset.y, 0);
if (transform.IsSingular()) {
return false;
}
bool canDraw2D = transform.CanDraw2D(&transform2d);
gfxSize scale;
bool isRetained = aLayer->Manager()->IsWidgetLayerManager();
// Only fiddle with scale factors for the retaining layer manager, since
// it only matters for retained layers
// XXX Should we do something for 3D transforms?
if (canDraw2D && isRetained) {
// If the container's transform is animated off main thread, then use the
// maximum scale.
if (aContainerFrame->GetContent() &&
nsLayoutUtils::HasAnimationsForCompositor(
aContainerFrame->GetContent(), eCSSProperty_transform)) {
scale = nsLayoutUtils::GetMaximumAnimatedScale(aContainerFrame->GetContent());
} else {
// Scale factors are normalized to a power of 2 to reduce the number of resolution changes
scale = RoundToFloatPrecision(transform2d.ScaleFactors(true));
// For frames with a changing transform that's not just a translation,
// round scale factors up to nearest power-of-2 boundary so that we don't
// keep having to redraw the content as it scales up and down. Rounding up to nearest
// power-of-2 boundary ensures we never scale up, only down --- avoiding
// jaggies. It also ensures we never scale down by more than a factor of 2,
// avoiding bad downscaling quality.
gfxMatrix frameTransform;
if (ActiveLayerTracker::IsStyleAnimated(aContainerFrame, eCSSProperty_transform) &&
aTransform &&
(!aTransform->Is2D(&frameTransform) || frameTransform.HasNonTranslationOrFlip())) {
// Don't clamp the scale factor when the new desired scale factor matches the old one
// or it was previously unscaled.
bool clamp = true;
gfxMatrix oldFrameTransform2d;
if (aLayer->GetBaseTransform().Is2D(&oldFrameTransform2d)) {
gfxSize oldScale = RoundToFloatPrecision(oldFrameTransform2d.ScaleFactors(true));
if (oldScale == scale || oldScale == gfxSize(1.0, 1.0)) {
clamp = false;
}
}
if (clamp) {
scale.width = gfxUtils::ClampToScaleFactor(scale.width);
scale.height = gfxUtils::ClampToScaleFactor(scale.height);
}
} else {
// XXX Do we need to move nearly-integer values to integers here?
}
}
// If the scale factors are too small, just use 1.0. The content is being
// scaled out of sight anyway.
if (fabs(scale.width) < 1e-8 || fabs(scale.height) < 1e-8) {
scale = gfxSize(1.0, 1.0);
}
} else {
scale = gfxSize(1.0, 1.0);
}
// Store the inverse of our resolution-scale on the layer
aLayer->SetBaseTransform(transform);
aLayer->SetPreScale(1.0f/float(scale.width),
1.0f/float(scale.height));
aLayer->SetInheritedScale(aIncomingScale.mXScale,
aIncomingScale.mYScale);
aOutgoingScale =
FrameLayerBuilder::ContainerParameters(scale.width, scale.height, -offset, aIncomingScale);
if (aTransform) {
aOutgoingScale.mInTransformedSubtree = true;
if (ActiveLayerTracker::IsStyleAnimated(aContainerFrame, eCSSProperty_transform)) {
aOutgoingScale.mInActiveTransformedSubtree = true;
}
}
if (isRetained && (!canDraw2D || transform2d.HasNonIntegerTranslation())) {
aOutgoingScale.mDisableSubpixelAntialiasingInDescendants = true;
}
return true;
}
/* static */ PLDHashOperator
FrameLayerBuilder::RestoreDisplayItemData(nsRefPtrHashKey<DisplayItemData>* aEntry, void* aUserArg)
{
DisplayItemData* data = aEntry->GetKey();
uint32_t *generation = static_cast<uint32_t*>(aUserArg);
if (data->mUsed && data->mContainerLayerGeneration >= *generation) {
return PL_DHASH_REMOVE;
}
return PL_DHASH_NEXT;
}
/* static */ PLDHashOperator
FrameLayerBuilder::RestoreThebesLayerItemEntries(ThebesLayerItemsEntry* aEntry, void* aUserArg)
{
uint32_t *generation = static_cast<uint32_t*>(aUserArg);
if (aEntry->mContainerLayerGeneration >= *generation) {
// We can just remove these items rather than attempting to revert them
// because we're going to want to invalidate everything when transitioning
// to component alpha flattening.
return PL_DHASH_REMOVE;
}
for (uint32_t i = 0; i < aEntry->mItems.Length(); i++) {
if (aEntry->mItems[i].mContainerLayerGeneration >= *generation) {
aEntry->mItems.TruncateLength(i);
return PL_DHASH_NEXT;
}
}
return PL_DHASH_NEXT;
}
already_AddRefed<ContainerLayer>
FrameLayerBuilder::BuildContainerLayerFor(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
nsIFrame* aContainerFrame,
nsDisplayItem* aContainerItem,
const nsDisplayList& aChildren,
const ContainerParameters& aParameters,
const gfx3DMatrix* aTransform,
uint32_t aFlags)
{
uint32_t containerDisplayItemKey =
aContainerItem ? aContainerItem->GetPerFrameKey() : nsDisplayItem::TYPE_ZERO;
NS_ASSERTION(aContainerFrame, "Container display items here should have a frame");
NS_ASSERTION(!aContainerItem ||
aContainerItem->Frame() == aContainerFrame,
"Container display item must match given frame");
if (!aParameters.mXScale || !aParameters.mYScale) {
return nullptr;
}
nsRefPtr<ContainerLayer> containerLayer;
if (aManager == mRetainingManager) {
// Using GetOldLayerFor will search merged frames, as well as the underlying
// frame. The underlying frame can change when a page scrolls, so this
// avoids layer recreation in the situation that a new underlying frame is
// picked for a layer.
Layer* oldLayer = nullptr;
if (aContainerItem) {
oldLayer = GetOldLayerFor(aContainerItem);
} else {
DisplayItemData *data = GetOldLayerForFrame(aContainerFrame, containerDisplayItemKey);
if (data) {
oldLayer = data->mLayer;
}
}
if (oldLayer) {
NS_ASSERTION(oldLayer->Manager() == aManager, "Wrong manager");
if (oldLayer->HasUserData(&gThebesDisplayItemLayerUserData)) {
// The old layer for this item is actually our ThebesLayer
// because we rendered its layer into that ThebesLayer. So we
// don't actually have a retained container layer.
} else {
NS_ASSERTION(oldLayer->GetType() == Layer::TYPE_CONTAINER,
"Wrong layer type");
containerLayer = static_cast<ContainerLayer*>(oldLayer);
containerLayer->SetMaskLayer(nullptr);
}
}
}
if (!containerLayer) {
// No suitable existing layer was found.
containerLayer = aManager->CreateContainerLayer();
if (!containerLayer)
return nullptr;
}
LayerState state = aContainerItem ? aContainerItem->GetLayerState(aBuilder, aManager, aParameters) : LAYER_ACTIVE;
if (state == LAYER_INACTIVE &&
nsDisplayItem::ForceActiveLayers()) {
state = LAYER_ACTIVE;
}
if (aContainerItem && state == LAYER_ACTIVE_EMPTY) {
// Empty layers only have metadata and should never have display items. We
// early exit because later, invalidation will walk up the frame tree to
// determine which thebes layer gets invalidated. Since an empty layer
// should never have anything to paint, it should never be invalidated.
NS_ASSERTION(aChildren.IsEmpty(), "Should have no children");
return containerLayer.forget();
}
ContainerParameters scaleParameters;
if (!ChooseScaleAndSetTransform(this, aBuilder, aContainerFrame, aTransform, aParameters,
containerLayer, state, scaleParameters)) {
return nullptr;
}
uint32_t oldGeneration = mContainerLayerGeneration;
mContainerLayerGeneration = ++mMaxContainerLayerGeneration;
nsRefPtr<RefCountedRegion> thebesLayerInvalidRegion = nullptr;
if (mRetainingManager) {
if (aContainerItem) {
StoreDataForFrame(aContainerItem, containerLayer, LAYER_ACTIVE);
} else {
StoreDataForFrame(aContainerFrame, containerDisplayItemKey, containerLayer, LAYER_ACTIVE);
}
}
LayerManagerData* data = static_cast<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
nsRect bounds;
nsIntRect pixBounds;
int32_t appUnitsPerDevPixel;
uint32_t stateFlags = 0;
if ((aContainerFrame->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) &&
mRetainingManager && !mRetainingManager->AreComponentAlphaLayersEnabled()) {
stateFlags = ContainerState::NO_COMPONENT_ALPHA;
}
uint32_t flags;
while (true) {
ContainerState state(aBuilder, aManager, aManager->GetLayerBuilder(),
aContainerFrame, aContainerItem,
containerLayer, scaleParameters);
state.ProcessDisplayItems(aChildren, stateFlags);
// Set CONTENT_COMPONENT_ALPHA if any of our children have it.
// This is suboptimal ... a child could have text that's over transparent
// pixels in its own layer, but over opaque parts of previous siblings.
state.Finish(&flags, data);
bounds = state.GetChildrenBounds();
pixBounds = state.ScaleToOutsidePixels(bounds, false);
appUnitsPerDevPixel = state.GetAppUnitsPerDevPixel();
if ((flags & Layer::CONTENT_COMPONENT_ALPHA) &&
mRetainingManager &&
!mRetainingManager->AreComponentAlphaLayersEnabled() &&
!stateFlags) {
// Since we don't want any component alpha layers on BasicLayers, we repeat
// the layer building process with this explicitely forced off.
// We restore the previous FrameLayerBuilder state since the first set
// of layer building will have changed it.
stateFlags = ContainerState::NO_COMPONENT_ALPHA;
data->mDisplayItems.EnumerateEntries(RestoreDisplayItemData,
&mContainerLayerGeneration);
mThebesLayerItems.EnumerateEntries(RestoreThebesLayerItemEntries,
&mContainerLayerGeneration);
aContainerFrame->AddStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
continue;
}
break;
}
NS_ASSERTION(bounds.IsEqualInterior(aChildren.GetBounds(aBuilder)), "Wrong bounds");
pixBounds.MoveBy(nsIntPoint(scaleParameters.mOffset.x, scaleParameters.mOffset.y));
if (aParameters.mAncestorClipRect && !(aFlags & CONTAINER_NOT_CLIPPED_BY_ANCESTORS)) {
SetVisibleRegionForLayer(containerLayer, nsIntRegion(pixBounds),
*aParameters.mAncestorClipRect);
} else {
containerLayer->SetVisibleRegion(pixBounds);
}
// Make sure that rounding the visible region out didn't add any area
// we won't paint
if (aChildren.IsOpaque() && !aChildren.NeedsTransparentSurface()) {
bounds.ScaleRoundIn(scaleParameters.mXScale, scaleParameters.mYScale);
if (bounds.Contains(pixBounds.ToAppUnits(appUnitsPerDevPixel))) {
// Clear CONTENT_COMPONENT_ALPHA
flags = Layer::CONTENT_OPAQUE;
}
}
containerLayer->SetContentFlags(flags);
mContainerLayerGeneration = oldGeneration;
nsPresContext::ClearNotifySubDocInvalidationData(containerLayer);
return containerLayer.forget();
}
Layer*
FrameLayerBuilder::GetLeafLayerFor(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
Layer* layer = GetOldLayerFor(aItem);
if (!layer)
return nullptr;
if (layer->HasUserData(&gThebesDisplayItemLayerUserData)) {
// This layer was created to render Thebes-rendered content for this
// display item. The display item should not use it for its own
// layer rendering.
return nullptr;
}
layer->SetMaskLayer(nullptr);
return layer;
}
/* static */ void
FrameLayerBuilder::InvalidateAllLayers(LayerManager* aManager)
{
LayerManagerData* data = static_cast<LayerManagerData*>
(aManager->GetUserData(&gLayerManagerUserData));
if (data) {
data->mInvalidateAllLayers = true;
}
}
/* static */ void
FrameLayerBuilder::InvalidateAllLayersForFrame(nsIFrame *aFrame)
{
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (array) {
for (uint32_t i = 0; i < array->Length(); i++) {
array->ElementAt(i)->mParent->mInvalidateAllLayers = true;
}
}
}
/* static */
Layer*
FrameLayerBuilder::GetDedicatedLayer(nsIFrame* aFrame, uint32_t aDisplayItemKey)
{
//TODO: This isn't completely correct, since a frame could exist as a layer
// in the normal widget manager, and as a different layer (or no layer)
// in the secondary manager
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (array) {
for (uint32_t i = 0; i < array->Length(); i++) {
DisplayItemData *element = array->ElementAt(i);
if (!element->mParent->mLayerManager->IsWidgetLayerManager()) {
continue;
}
if (element->mDisplayItemKey == aDisplayItemKey) {
if (element->mOptLayer) {
return element->mOptLayer;
}
Layer* layer = element->mLayer;
if (!layer->HasUserData(&gColorLayerUserData) &&
!layer->HasUserData(&gImageLayerUserData) &&
!layer->HasUserData(&gThebesDisplayItemLayerUserData)) {
return layer;
}
}
}
}
return nullptr;
}
static gfxSize
PredictScaleForContent(nsIFrame* aFrame, nsIFrame* aAncestorWithScale,
const gfxSize& aScale)
{
gfx3DMatrix transform =
gfx3DMatrix::ScalingMatrix(aScale.width, aScale.height, 1.0);
if (aFrame != aAncestorWithScale) {
// aTransform is applied first, then the scale is applied to the result
transform = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestorWithScale)*transform;
}
gfxMatrix transform2d;
if (transform.CanDraw2D(&transform2d)) {
return transform2d.ScaleFactors(true);
}
return gfxSize(1.0, 1.0);
}
gfxSize
FrameLayerBuilder::GetThebesLayerScaleForFrame(nsIFrame* aFrame)
{
nsIFrame* last;
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
last = f;
if (nsLayoutUtils::IsPopup(f)) {
// Don't examine ancestors of a popup. It won't make sense to check
// the transform from some content inside the popup to some content
// which is an ancestor of the popup.
break;
}
nsTArray<DisplayItemData*> *array =
reinterpret_cast<nsTArray<DisplayItemData*>*>(aFrame->Properties().Get(LayerManagerDataProperty()));
if (!array) {
continue;
}
for (uint32_t i = 0; i < array->Length(); i++) {
Layer* layer = array->ElementAt(i)->mLayer;
ContainerLayer* container = layer->AsContainerLayer();
if (!container ||
!layer->Manager()->IsWidgetLayerManager()) {
continue;
}
for (Layer* l = container->GetFirstChild(); l; l = l->GetNextSibling()) {
ThebesDisplayItemLayerUserData* data =
static_cast<ThebesDisplayItemLayerUserData*>
(l->GetUserData(&gThebesDisplayItemLayerUserData));
if (data) {
return PredictScaleForContent(aFrame, f, gfxSize(data->mXScale, data->mYScale));
}
}
}
}
return PredictScaleForContent(aFrame, last,
last->PresContext()->PresShell()->GetResolution());
}
#ifdef MOZ_DUMP_PAINTING
static void DebugPaintItem(nsRenderingContext* aDest, nsDisplayItem *aItem, nsDisplayListBuilder* aBuilder)
{
bool snap;
nsRect appUnitBounds = aItem->GetBounds(aBuilder, &snap);
gfxRect bounds(appUnitBounds.x, appUnitBounds.y, appUnitBounds.width, appUnitBounds.height);
bounds.ScaleInverse(aDest->AppUnitsPerDevPixel());
nsRefPtr<gfxASurface> surf =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(gfxIntSize(bounds.width, bounds.height),
GFX_CONTENT_COLOR_ALPHA);
surf->SetDeviceOffset(-bounds.TopLeft());
nsRefPtr<gfxContext> context = new gfxContext(surf);
nsRefPtr<nsRenderingContext> ctx = new nsRenderingContext();
ctx->Init(aDest->DeviceContext(), context);
aItem->Paint(aBuilder, ctx);
DumpPaintedImage(aItem, surf);
aItem->SetPainted();
surf->SetDeviceOffset(gfxPoint(0, 0));
aDest->ThebesContext()->SetSource(surf, bounds.TopLeft());
aDest->ThebesContext()->Rectangle(bounds);
aDest->ThebesContext()->Fill();
}
#endif
/*
* A note on residual transforms:
*
* In a transformed subtree we sometimes apply the ThebesLayer's
* "residual transform" when drawing content into the ThebesLayer.
* This is a translation by components in the range [-0.5,0.5) provided
* by the layer system; applying the residual transform followed by the
* transforms used by layer compositing ensures that the subpixel alignment
* of the content of the ThebesLayer exactly matches what it would be if
* we used cairo/Thebes to draw directly to the screen without going through
* retained layer buffers.
*
* The visible and valid regions of the ThebesLayer are computed without
* knowing the residual transform (because we don't know what the residual
* transform is going to be until we've built the layer tree!). So we have to
* consider whether content painted in the range [x, xmost) might be painted
* outside the visible region we computed for that content. The visible region
* would be [floor(x), ceil(xmost)). The content would be rendered at
* [x + r, xmost + r), where -0.5 <= r < 0.5. So some half-rendered pixels could
* indeed fall outside the computed visible region, which is not a big deal;
* similar issues already arise when we snap cliprects to nearest pixels.
* Note that if the rendering of the content is snapped to nearest pixels ---
* which it often is --- then the content is actually rendered at
* [snap(x + r), snap(xmost + r)). It turns out that floor(x) <= snap(x + r)
* and ceil(xmost) >= snap(xmost + r), so the rendering of snapped content
* always falls within the visible region we computed.
*/
/* static */ void
FrameLayerBuilder::DrawThebesLayer(ThebesLayer* aLayer,
gfxContext* aContext,
const nsIntRegion& aRegionToDraw,
const nsIntRegion& aRegionToInvalidate,
void* aCallbackData)
{
PROFILER_LABEL("gfx", "DrawThebesLayer");
nsDisplayListBuilder* builder = static_cast<nsDisplayListBuilder*>
(aCallbackData);
FrameLayerBuilder *layerBuilder = aLayer->Manager()->GetLayerBuilder();
NS_ASSERTION(layerBuilder, "Unexpectedly null layer builder!");
if (layerBuilder->CheckDOMModified())
return;
nsTArray<ClippedDisplayItem> items;
uint32_t commonClipCount;
nsIFrame* containerLayerFrame;
{
ThebesLayerItemsEntry* entry = layerBuilder->mThebesLayerItems.GetEntry(aLayer);
NS_ASSERTION(entry, "We shouldn't be drawing into a layer with no items!");
items.SwapElements(entry->mItems);
commonClipCount = entry->mCommonClipCount;
containerLayerFrame = entry->mContainerLayerFrame;
// Later after this point, due to calls to DidEndTransaction
// for temporary layer managers, mThebesLayerItems can change,
// so 'entry' could become invalid.
}
if (!containerLayerFrame) {
return;
}
ThebesDisplayItemLayerUserData* userData =
static_cast<ThebesDisplayItemLayerUserData*>
(aLayer->GetUserData(&gThebesDisplayItemLayerUserData));
NS_ASSERTION(userData, "where did our user data go?");
if (NS_GET_A(userData->mForcedBackgroundColor) > 0) {
nsIntRect r = aLayer->GetVisibleRegion().GetBounds();
aContext->NewPath();
aContext->Rectangle(gfxRect(r.x, r.y, r.width, r.height));
aContext->SetColor(gfxRGBA(userData->mForcedBackgroundColor));
aContext->Fill();
}
// make the origin of the context coincide with the origin of the
// ThebesLayer
gfxContextMatrixAutoSaveRestore saveMatrix(aContext);
nsIntPoint offset = GetTranslationForThebesLayer(aLayer);
// Apply the residual transform if it has been enabled, to ensure that
// snapping when we draw into aContext exactly matches the ideal transform.
// See above for why this is OK.
aContext->Translate(aLayer->GetResidualTranslation() - gfxPoint(offset.x, offset.y));
aContext->Scale(userData->mXScale, userData->mYScale);
nsPresContext* presContext = containerLayerFrame->PresContext();
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
uint32_t i;
// Update visible regions. We need perform visibility analysis again
// because we may be asked to draw into part of a ThebesLayer that
// isn't actually visible in the window (e.g., because a ThebesLayer
// expanded its visible region to a rectangle internally), in which
// case the mVisibleRect stored in the display item may be wrong.
nsRegion visible = aRegionToDraw.ToAppUnits(appUnitsPerDevPixel);
visible.MoveBy(NSIntPixelsToAppUnits(offset.x, appUnitsPerDevPixel),
NSIntPixelsToAppUnits(offset.y, appUnitsPerDevPixel));
visible.ScaleInverseRoundOut(userData->mXScale, userData->mYScale);
for (i = items.Length(); i > 0; --i) {
ClippedDisplayItem* cdi = &items[i - 1];
const DisplayItemClip& clip = cdi->mItem->GetClip();
NS_ASSERTION(AppUnitsPerDevPixel(cdi->mItem) == appUnitsPerDevPixel,
"a thebes layer should contain items only at the same zoom");
NS_ABORT_IF_FALSE(clip.HasClip() ||
clip.GetRoundedRectCount() == 0,
"If we have rounded rects, we must have a clip rect");
if (!clip.IsRectAffectedByClip(visible.GetBounds())) {
cdi->mItem->RecomputeVisibility(builder, &visible);
continue;
}
// Do a little dance to account for the fact that we're clipping
// to cdi->mClipRect
nsRegion clipped;
clipped.And(visible, clip.NonRoundedIntersection());
nsRegion finalClipped = clipped;
cdi->mItem->RecomputeVisibility(builder, &finalClipped);
// If we have rounded clip rects, don't subtract from the visible
// region since we aren't displaying everything inside the rect.
if (clip.GetRoundedRectCount() == 0) {
nsRegion removed;
removed.Sub(clipped, finalClipped);
nsRegion newVisible;
newVisible.Sub(visible, removed);
// Don't let the visible region get too complex.
if (newVisible.GetNumRects() <= 15) {
visible = newVisible;
}
}
}
nsRefPtr<nsRenderingContext> rc = new nsRenderingContext();
rc->Init(presContext->DeviceContext(), aContext);
DisplayItemClip currentClip;
bool currentClipIsSetInContext = false;
DisplayItemClip tmpClip;
for (i = 0; i < items.Length(); ++i) {
ClippedDisplayItem* cdi = &items[i];
if (cdi->mItem->GetVisibleRect().IsEmpty())
continue;
// If the new desired clip state is different from the current state,
// update the clip.
const DisplayItemClip* clip = &cdi->mItem->GetClip();
if (clip->GetRoundedRectCount() > 0 &&
!clip->IsRectClippedByRoundedCorner(cdi->mItem->GetVisibleRect())) {
tmpClip = *clip;
tmpClip.RemoveRoundedCorners();
clip = &tmpClip;
}
if (currentClipIsSetInContext != clip->HasClip() ||
(clip->HasClip() && *clip != currentClip)) {
if (currentClipIsSetInContext) {
aContext->Restore();
}
currentClipIsSetInContext = clip->HasClip();
if (currentClipIsSetInContext) {
currentClip = *clip;
aContext->Save();
NS_ASSERTION(commonClipCount < 100,
"Maybe you really do have more than a hundred clipping rounded rects, or maybe something has gone wrong.");
currentClip.ApplyTo(aContext, presContext, commonClipCount);
aContext->NewPath();
}
}
if (cdi->mInactiveLayerManager) {
PaintInactiveLayer(builder, cdi->mInactiveLayerManager, cdi->mItem, aContext, rc);
} else {
nsIFrame* frame = cdi->mItem->Frame();
frame->AddStateBits(NS_FRAME_PAINTED_THEBES);
#ifdef MOZ_DUMP_PAINTING
if (gfxUtils::sDumpPainting) {
DebugPaintItem(rc, cdi->mItem, builder);
} else {
#else
{
#endif
cdi->mItem->Paint(builder, rc);
}
}
if (layerBuilder->CheckDOMModified())
break;
}
{
ThebesLayerItemsEntry* entry =
layerBuilder->mThebesLayerItems.GetEntry(aLayer);
items.SwapElements(entry->mItems);
}
if (currentClipIsSetInContext) {
aContext->Restore();
}
if (presContext->GetPaintFlashing()) {
FlashPaint(aContext);
}
if (!aRegionToInvalidate.IsEmpty()) {
aLayer->AddInvalidRect(aRegionToInvalidate.GetBounds());
}
}
bool
FrameLayerBuilder::CheckDOMModified()
{
if (!mRootPresContext ||
mInitialDOMGeneration == mRootPresContext->GetDOMGeneration())
return false;
if (mDetectedDOMModification) {
// Don't spam the console with extra warnings
return true;
}
mDetectedDOMModification = true;
// Painting is not going to complete properly. There's not much
// we can do here though. Invalidating the window to get another repaint
// is likely to lead to an infinite repaint loop.
NS_WARNING("Detected DOM modification during paint, bailing out!");
return true;
}
#ifdef MOZ_DUMP_PAINTING
/* static */ void
FrameLayerBuilder::DumpRetainedLayerTree(LayerManager* aManager, FILE* aFile, bool aDumpHtml)
{
aManager->Dump(aFile, "", aDumpHtml);
}
#endif
gfxRect
CalculateBounds(const nsTArray<DisplayItemClip::RoundedRect>& aRects, int32_t A2D)
{
nsRect bounds = aRects[0].mRect;
for (uint32_t i = 1; i < aRects.Length(); ++i) {
bounds.UnionRect(bounds, aRects[i].mRect);
}
return nsLayoutUtils::RectToGfxRect(bounds, A2D);
}
static void
SetClipCount(ThebesDisplayItemLayerUserData* aThebesData,
uint32_t aClipCount)
{
if (aThebesData) {
aThebesData->mMaskClipCount = aClipCount;
}
}
void
ContainerState::SetupMaskLayer(Layer *aLayer, const DisplayItemClip& aClip,
uint32_t aRoundedRectClipCount)
{
// if the number of clips we are going to mask has decreased, then aLayer might have
// cached graphics which assume the existence of a soon-to-be non-existent mask layer
// in that case, invalidate the whole layer.
ThebesDisplayItemLayerUserData* thebesData = GetThebesDisplayItemLayerUserData(aLayer);
if (thebesData &&
aRoundedRectClipCount < thebesData->mMaskClipCount) {
ThebesLayer* thebes = aLayer->AsThebesLayer();
thebes->InvalidateRegion(thebes->GetValidRegion().GetBounds());
}
// don't build an unnecessary mask
nsIntRect layerBounds = aLayer->GetVisibleRegion().GetBounds();
if (aClip.GetRoundedRectCount() == 0 ||
aRoundedRectClipCount == 0 ||
layerBounds.IsEmpty()) {
SetClipCount(thebesData, 0);
return;
}
// check if we can re-use the mask layer
nsRefPtr<ImageLayer> maskLayer = CreateOrRecycleMaskImageLayerFor(aLayer);
MaskLayerUserData* userData = GetMaskLayerUserData(maskLayer);
MaskLayerUserData newData;
aClip.AppendRoundedRects(&newData.mRoundedClipRects, aRoundedRectClipCount);
newData.mScaleX = mParameters.mXScale;
newData.mScaleY = mParameters.mYScale;
newData.mOffset = mParameters.mOffset;
newData.mAppUnitsPerDevPixel = mContainerFrame->PresContext()->AppUnitsPerDevPixel();
if (*userData == newData) {
aLayer->SetMaskLayer(maskLayer);
SetClipCount(thebesData, aRoundedRectClipCount);
return;
}
// calculate a more precise bounding rect
gfxRect boundingRect = CalculateBounds(newData.mRoundedClipRects,
newData.mAppUnitsPerDevPixel);
boundingRect.Scale(mParameters.mXScale, mParameters.mYScale);
uint32_t maxSize = mManager->GetMaxTextureSize();
NS_ASSERTION(maxSize > 0, "Invalid max texture size");
gfxSize surfaceSize(std::min<float>(boundingRect.Width(), maxSize),
std::min<float>(boundingRect.Height(), maxSize));
// maskTransform is applied to the clip when it is painted into the mask (as a
// component of imageTransform), and its inverse used when the mask is used for
// masking.
// It is the transform from the masked layer's space to mask space
gfxMatrix maskTransform;
maskTransform.Scale(surfaceSize.width/boundingRect.Width(),
surfaceSize.height/boundingRect.Height());
maskTransform.Translate(-boundingRect.TopLeft());
// imageTransform is only used when the clip is painted to the mask
gfxMatrix imageTransform = maskTransform;
imageTransform.Scale(mParameters.mXScale, mParameters.mYScale);
nsAutoPtr<MaskLayerImageCache::MaskLayerImageKey> newKey(
new MaskLayerImageCache::MaskLayerImageKey());
// copy and transform the rounded rects
for (uint32_t i = 0; i < newData.mRoundedClipRects.Length(); ++i) {
newKey->mRoundedClipRects.AppendElement(
MaskLayerImageCache::PixelRoundedRect(newData.mRoundedClipRects[i],
mContainerFrame->PresContext()));
newKey->mRoundedClipRects[i].ScaleAndTranslate(imageTransform);
}
const MaskLayerImageCache::MaskLayerImageKey* lookupKey = newKey;
// check to see if we can reuse a mask image
nsRefPtr<ImageContainer> container =
GetMaskLayerImageCache()->FindImageFor(&lookupKey);
if (!container) {
nsIntSize surfaceSizeInt = nsIntSize(NSToIntCeil(surfaceSize.width),
NSToIntCeil(surfaceSize.height));
// no existing mask image, so build a new one
nsRefPtr<gfxASurface> surface =
aLayer->Manager()->CreateOptimalMaskSurface(surfaceSizeInt);
// fail if we can't get the right surface
if (!surface || surface->CairoStatus()) {
NS_WARNING("Could not create surface for mask layer.");
SetClipCount(thebesData, 0);
return;
}
nsRefPtr<gfxContext> context = new gfxContext(surface);
context->Multiply(imageTransform);
// paint the clipping rects with alpha to create the mask
context->SetColor(gfxRGBA(1, 1, 1, 1));
aClip.DrawRoundedRectsTo(context,
newData.mAppUnitsPerDevPixel,
0,
aRoundedRectClipCount);
// build the image and container
container = aLayer->Manager()->CreateImageContainer();
NS_ASSERTION(container, "Could not create image container for mask layer.");
static const ImageFormat format = CAIRO_SURFACE;
nsRefPtr<Image> image = container->CreateImage(&format, 1);
NS_ASSERTION(image, "Could not create image container for mask layer.");
CairoImage::Data data;
data.mSurface = surface;
data.mSize = surfaceSizeInt;
static_cast<CairoImage*>(image.get())->SetData(data);
container->SetCurrentImageInTransaction(image);
GetMaskLayerImageCache()->PutImage(newKey.forget(), container);
}
maskLayer->SetContainer(container);
gfx3DMatrix matrix = gfx3DMatrix::From2D(maskTransform.Invert());
matrix.Translate(gfxPoint3D(mParameters.mOffset.x, mParameters.mOffset.y, 0));
maskLayer->SetBaseTransform(matrix);
// save the details of the clip in user data
userData->mScaleX = newData.mScaleX;
userData->mScaleY = newData.mScaleY;
userData->mRoundedClipRects.SwapElements(newData.mRoundedClipRects);
userData->mImageKey = lookupKey;
aLayer->SetMaskLayer(maskLayer);
SetClipCount(thebesData, aRoundedRectClipCount);
return;
}
} // namespace mozilla
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