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Diffstat (limited to 'layout/base/nsCSSFrameConstructor.cpp')
| -rw-r--r-- | layout/base/nsCSSFrameConstructor.cpp | 12074 |
1 files changed, 12074 insertions, 0 deletions
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp new file mode 100644 index 0000000000..5305b628bd --- /dev/null +++ b/layout/base/nsCSSFrameConstructor.cpp @@ -0,0 +1,12074 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * construction of a frame tree that is nearly isomorphic to the content + * tree and updating of that tree in response to dynamic changes + */ + +#include "nsCSSFrameConstructor.h" + +#include "mozilla/AutoRestore.h" +#include "mozilla/ComputedStyleInlines.h" +#include "mozilla/DebugOnly.h" +#include "mozilla/ErrorResult.h" +#include "mozilla/ManualNAC.h" +#include "mozilla/dom/BindContext.h" +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/dom/GeneratedImageContent.h" +#include "mozilla/dom/HTMLSelectElement.h" +#include "mozilla/dom/HTMLSharedListElement.h" +#include "mozilla/dom/HTMLSummaryElement.h" +#include "mozilla/Likely.h" +#include "mozilla/LinkedList.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/PresShell.h" +#include "mozilla/PresShellInlines.h" +#include "mozilla/PrintedSheetFrame.h" +#include "mozilla/ProfilerLabels.h" +#include "mozilla/ProfilerMarkers.h" +#include "mozilla/ScopeExit.h" +#include "mozilla/ServoBindings.h" +#include "mozilla/ServoStyleSetInlines.h" +#include "mozilla/StaticPrefs_browser.h" +#include "mozilla/StaticPrefs_layout.h" +#include "mozilla/StaticPrefs_mathml.h" +#include "mozilla/Unused.h" +#include "RetainedDisplayListBuilder.h" +#include "nsAbsoluteContainingBlock.h" +#include "nsMenuBarListener.h" +#include "nsCSSPseudoElements.h" +#include "nsCheckboxRadioFrame.h" +#include "nsCRT.h" +#include "nsAtom.h" +#include "nsIFrameInlines.h" +#include "nsGkAtoms.h" +#include "nsPresContext.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/DocumentInlines.h" +#include "nsTableFrame.h" +#include "nsTableColFrame.h" +#include "nsTableRowFrame.h" +#include "nsTableCellFrame.h" +#include "nsHTMLParts.h" +#include "nsUnicharUtils.h" +#include "nsViewManager.h" +#include "nsStyleConsts.h" +#include "nsXULElement.h" +#include "nsContainerFrame.h" +#include "nsNameSpaceManager.h" +#include "nsComboboxControlFrame.h" +#include "nsListControlFrame.h" +#include "nsPlaceholderFrame.h" +#include "nsTableRowGroupFrame.h" +#include "nsIFormControl.h" +#include "nsCSSAnonBoxes.h" +#include "nsTextFragment.h" +#include "nsTextBoxFrame.h" +#include "nsIAnonymousContentCreator.h" +#include "nsContentUtils.h" +#include "nsIScriptError.h" +#ifdef XP_MACOSX +# include "nsIDocShell.h" +#endif +#include "ChildIterator.h" +#include "nsError.h" +#include "nsLayoutUtils.h" +#include "nsBoxFrame.h" +#include "nsBoxLayout.h" +#include "nsFlexContainerFrame.h" +#include "nsGridContainerFrame.h" +#include "RubyUtils.h" +#include "nsRubyFrame.h" +#include "nsRubyBaseFrame.h" +#include "nsRubyBaseContainerFrame.h" +#include "nsRubyTextFrame.h" +#include "nsRubyTextContainerFrame.h" +#include "nsImageFrame.h" +#include "nsIObjectLoadingContent.h" +#include "nsTArray.h" +#include "mozilla/dom/CharacterData.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/ElementInlines.h" +#include "mozilla/dom/HTMLInputElement.h" +#include "nsAutoLayoutPhase.h" +#include "nsStyleStructInlines.h" +#include "nsPageContentFrame.h" +#include "mozilla/RestyleManager.h" +#include "StickyScrollContainer.h" +#include "nsFieldSetFrame.h" +#include "nsInlineFrame.h" +#include "nsBlockFrame.h" +#include "nsCanvasFrame.h" +#include "nsFirstLetterFrame.h" +#include "nsGfxScrollFrame.h" +#include "nsPageFrame.h" +#include "nsPageSequenceFrame.h" +#include "nsTableWrapperFrame.h" +#include "nsIScrollableFrame.h" +#include "nsBackdropFrame.h" +#include "nsTransitionManager.h" + +#include "nsIPopupContainer.h" +#ifdef ACCESSIBILITY +# include "nsAccessibilityService.h" +#endif + +#undef NOISY_FIRST_LETTER + +#include "nsMathMLParts.h" +#include "mozilla/dom/SVGAnimationElement.h" +#include "mozilla/dom/SVGFilters.h" +#include "mozilla/dom/SVGTests.h" +#include "mozilla/SVGGradientFrame.h" +#include "mozilla/SVGUtils.h" + +#include "nsRefreshDriver.h" +#include "nsTextNode.h" +#include "ActiveLayerTracker.h" + +using namespace mozilla; +using namespace mozilla::dom; + +nsIFrame* NS_NewHTMLCanvasFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewHTMLVideoFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsContainerFrame* NS_NewSVGOuterSVGFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsContainerFrame* NS_NewSVGOuterSVGAnonChildFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsIFrame* NS_NewSVGInnerSVGFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGGeometryFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGGFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsContainerFrame* NS_NewSVGForeignObjectFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsIFrame* NS_NewSVGAFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGSwitchFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGSymbolFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGTextFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGContainerFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGUseFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGViewFrame(PresShell* aPresShell, ComputedStyle* aStyle); +extern nsIFrame* NS_NewSVGLinearGradientFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +extern nsIFrame* NS_NewSVGRadialGradientFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +extern nsIFrame* NS_NewSVGStopFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsContainerFrame* NS_NewSVGMarkerFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsContainerFrame* NS_NewSVGMarkerAnonChildFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +extern nsIFrame* NS_NewSVGImageFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsIFrame* NS_NewSVGClipPathFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGFilterFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGPatternFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGMaskFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGFEContainerFrame(PresShell* aPresShell, + ComputedStyle* aStyle); +nsIFrame* NS_NewSVGFELeafFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGFEImageFrame(PresShell* aPresShell, ComputedStyle* aStyle); +nsIFrame* NS_NewSVGFEUnstyledLeafFrame(PresShell* aPresShell, + ComputedStyle* aStyle); + +#include "mozilla/dom/NodeInfo.h" +#include "prenv.h" +#include "nsNodeInfoManager.h" +#include "nsContentCreatorFunctions.h" + +#ifdef DEBUG +// Set the environment variable GECKO_FRAMECTOR_DEBUG_FLAGS to one or +// more of the following flags (comma separated) for handy debug +// output. +static bool gNoisyContentUpdates = false; +static bool gReallyNoisyContentUpdates = false; +static bool gNoisyInlineConstruction = false; + +struct FrameCtorDebugFlags { + const char* name; + bool* on; +}; + +static FrameCtorDebugFlags gFlags[] = { + {"content-updates", &gNoisyContentUpdates}, + {"really-noisy-content-updates", &gReallyNoisyContentUpdates}, + {"noisy-inline", &gNoisyInlineConstruction}}; + +# define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0])) +#endif + +#include "nsTreeColFrame.h" + +//------------------------------------------------------------------ + +nsIFrame* NS_NewLeafBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewRangeFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewImageBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewTextBoxFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewSplitterFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewMenuPopupFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewMenuFrame(PresShell* aPresShell, ComputedStyle* aStyle, + uint32_t aFlags); + +nsIFrame* NS_NewMenuBarFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewTreeBodyFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsHTMLScrollFrame* NS_NewHTMLScrollFrame(PresShell* aPresShell, + ComputedStyle* aStyle, bool aIsRoot); + +nsXULScrollFrame* NS_NewXULScrollFrame(PresShell* aPresShell, + ComputedStyle* aStyle, bool aIsRoot); + +nsIFrame* NS_NewSliderFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewScrollbarFrame(PresShell* aPresShell, ComputedStyle* aStyle); + +nsIFrame* NS_NewScrollbarButtonFrame(PresShell* aPresShell, + ComputedStyle* aStyle); + +nsIFrame* NS_NewImageFrameForContentProperty(PresShell*, ComputedStyle*); +nsIFrame* NS_NewImageFrameForGeneratedContentIndex(PresShell*, ComputedStyle*); +nsIFrame* NS_NewImageFrameForListStyleImage(PresShell*, ComputedStyle*); + +// Returns true if aFrame is an anonymous flex/grid item. +static inline bool IsAnonymousItem(const nsIFrame* aFrame) { + return aFrame->Style()->GetPseudoType() == PseudoStyleType::anonymousItem; +} + +// Returns true IFF the given nsIFrame is a nsFlexContainerFrame and represents +// a -webkit-{inline-}box container. +static inline bool IsFlexContainerForLegacyWebKitBox(const nsIFrame* aFrame) { + return aFrame->IsFlexContainerFrame() && + aFrame->HasAnyStateBits(NS_STATE_FLEX_IS_EMULATING_LEGACY_WEBKIT_BOX); +} + +#if DEBUG +static void AssertAnonymousFlexOrGridItemParent(const nsIFrame* aChild, + const nsIFrame* aParent) { + MOZ_ASSERT(IsAnonymousItem(aChild), "expected an anonymous item child frame"); + MOZ_ASSERT(aParent, "expected a parent frame"); + MOZ_ASSERT(aParent->IsFlexContainerFrame() || + aParent->IsGridContainerFrame() || aParent->IsXULBoxFrame(), + "anonymous items should only exist as children of " + "flex/grid/-moz-box container frames"); +} +#else +# define AssertAnonymousFlexOrGridItemParent(x, y) PR_BEGIN_MACRO PR_END_MACRO +#endif + +#define ToCreationFunc(_func) \ + [](PresShell* aPs, ComputedStyle* aStyle) -> nsIFrame* { \ + return _func(aPs, aStyle); \ + } + +/** + * True if aFrame is an actual inline frame in the sense of non-replaced + * display:inline CSS boxes. In other words, it can be affected by {ib} + * splitting and can contain first-letter frames. Basically, this is either an + * inline frame (positioned or otherwise) or an line frame (this last because + * it can contain first-letter and because inserting blocks in the middle of it + * needs to terminate it). + */ +static bool IsInlineFrame(const nsIFrame* aFrame) { + return aFrame->IsFrameOfType(nsIFrame::eLineParticipant); +} + +/** + * True for display: contents elements. + */ +static inline bool IsDisplayContents(const Element* aElement) { + return aElement->IsDisplayContents(); +} + +static inline bool IsDisplayContents(const nsIContent* aContent) { + return aContent->IsElement() && IsDisplayContents(aContent->AsElement()); +} + +/** + * True if aFrame is an instance of an SVG frame class or is an inline/block + * frame being used for SVG text. + */ +static bool IsFrameForSVG(const nsIFrame* aFrame) { + return aFrame->IsFrameOfType(nsIFrame::eSVG) || + SVGUtils::IsInSVGTextSubtree(aFrame); +} + +static bool IsLastContinuationForColumnContent(const nsIFrame* aFrame) { + MOZ_ASSERT(aFrame); + return aFrame->Style()->GetPseudoType() == PseudoStyleType::columnContent && + !aFrame->GetNextContinuation(); +} + +/** + * Returns true iff aFrame explicitly prevents its descendants from floating + * (at least, down to the level of descendants which themselves are + * float-containing blocks -- those will manage the floating status of any + * lower-level descendents inside them, of course). + */ +static bool ShouldSuppressFloatingOfDescendants(nsIFrame* aFrame) { + return aFrame->IsFlexOrGridContainer() || aFrame->IsXULBoxFrame() || + aFrame->IsFrameOfType(nsIFrame::eMathML); +} + +// Return true if column-span descendants should be suppressed under aFrame's +// subtree (until a multi-column container re-establishing a block formatting +// context). Basically, this is testing whether aFrame establishes a new block +// formatting context or not. +static bool ShouldSuppressColumnSpanDescendants(nsIFrame* aFrame) { + if (aFrame->Style()->GetPseudoType() == PseudoStyleType::columnContent) { + // Never suppress column-span under ::-moz-column-content frames. + return false; + } + + if (aFrame->IsInlineFrame()) { + // Allow inline frames to have column-span block children. + return false; + } + + if (!aFrame->IsBlockFrameOrSubclass() || + aFrame->HasAnyStateBits(NS_BLOCK_FLOAT_MGR | NS_FRAME_OUT_OF_FLOW) || + aFrame->IsFixedPosContainingBlock()) { + // Need to suppress column-span if we: + // - Are a different block formatting context, + // - Are an out-of-flow frame, OR + // - Establish a containing block for fixed-position descendants + // + // For example, the children of a column-span never need to be further + // processed even if there is a nested column-span child. Because a + // column-span always creates its own block formatting context, a nested + // column-span child won't be in the same block formatting context with the + // nearest multi-column ancestor. This is the same case as if the + // column-span is outside of a multi-column hierarchy. + return true; + } + + return false; +} + +// Reparent a frame into a wrapper frame that is a child of its old parent. +static void ReparentFrame(RestyleManager* aRestyleManager, + nsContainerFrame* aNewParentFrame, nsIFrame* aFrame, + bool aForceStyleReparent) { + aFrame->SetParent(aNewParentFrame); + // We reparent frames for two reasons: to put them inside ::first-line, and to + // put them inside some wrapper anonymous boxes. + if (aForceStyleReparent) { + aRestyleManager->ReparentComputedStyleForFirstLine(aFrame); + } +} + +static void ReparentFrames(nsCSSFrameConstructor* aFrameConstructor, + nsContainerFrame* aNewParentFrame, + const nsFrameList& aFrameList, + bool aForceStyleReparent) { + RestyleManager* restyleManager = aFrameConstructor->RestyleManager(); + for (nsIFrame* f : aFrameList) { + ReparentFrame(restyleManager, aNewParentFrame, f, aForceStyleReparent); + } +} + +//---------------------------------------------------------------------- +// +// When inline frames get weird and have block frames in them, we +// annotate them to help us respond to incremental content changes +// more easily. + +static inline bool IsFramePartOfIBSplit(nsIFrame* aFrame) { + bool result = aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT); + MOZ_ASSERT(!result || static_cast<nsBlockFrame*>(do_QueryFrame(aFrame)) || + static_cast<nsInlineFrame*>(do_QueryFrame(aFrame)), + "only block/inline frames can have NS_FRAME_PART_OF_IBSPLIT"); + return result; +} + +static nsContainerFrame* GetIBSplitSibling(nsIFrame* aFrame) { + MOZ_ASSERT(IsFramePartOfIBSplit(aFrame), "Shouldn't call this"); + + // We only store the "ib-split sibling" annotation with the first + // frame in the continuation chain. Walk back to find that frame now. + return aFrame->FirstContinuation()->GetProperty(nsIFrame::IBSplitSibling()); +} + +static nsContainerFrame* GetIBSplitPrevSibling(nsIFrame* aFrame) { + MOZ_ASSERT(IsFramePartOfIBSplit(aFrame), "Shouldn't call this"); + + // We only store the ib-split sibling annotation with the first + // frame in the continuation chain. Walk back to find that frame now. + return aFrame->FirstContinuation()->GetProperty( + nsIFrame::IBSplitPrevSibling()); +} + +static nsContainerFrame* GetLastIBSplitSibling(nsIFrame* aFrame) { + for (nsIFrame *frame = aFrame, *next;; frame = next) { + next = GetIBSplitSibling(frame); + if (!next) { + return static_cast<nsContainerFrame*>(frame); + } + } + MOZ_ASSERT_UNREACHABLE("unreachable code"); + return nullptr; +} + +static void SetFrameIsIBSplit(nsContainerFrame* aFrame, + nsContainerFrame* aIBSplitSibling) { + MOZ_ASSERT(aFrame, "bad args!"); + + // We should be the only continuation + NS_ASSERTION(!aFrame->GetPrevContinuation(), + "assigning ib-split sibling to other than first continuation!"); + NS_ASSERTION(!aFrame->GetNextContinuation() || + IsFramePartOfIBSplit(aFrame->GetNextContinuation()), + "should have no non-ib-split continuations here"); + + // Mark the frame as ib-split. + aFrame->AddStateBits(NS_FRAME_PART_OF_IBSPLIT); + + if (aIBSplitSibling) { + NS_ASSERTION(!aIBSplitSibling->GetPrevContinuation(), + "assigning something other than the first continuation as the " + "ib-split sibling"); + + // Store the ib-split sibling (if we were given one) with the + // first frame in the flow. + aFrame->SetProperty(nsIFrame::IBSplitSibling(), aIBSplitSibling); + aIBSplitSibling->SetProperty(nsIFrame::IBSplitPrevSibling(), aFrame); + } +} + +static nsIFrame* GetIBContainingBlockFor(nsIFrame* aFrame) { + MOZ_ASSERT( + IsFramePartOfIBSplit(aFrame), + "GetIBContainingBlockFor() should only be called on known IB frames"); + + // Get the first "normal" ancestor of the target frame. + nsIFrame* parentFrame; + do { + parentFrame = aFrame->GetParent(); + + if (!parentFrame) { + NS_ERROR("no unsplit block frame in IB hierarchy"); + return aFrame; + } + + // Note that we ignore non-ib-split frames which have a pseudo on their + // ComputedStyle -- they're not the frames we're looking for! In + // particular, they may be hiding a real parent that _is_ in an ib-split. + if (!IsFramePartOfIBSplit(parentFrame) && + !parentFrame->Style()->IsPseudoOrAnonBox()) + break; + + aFrame = parentFrame; + } while (1); + + // post-conditions + NS_ASSERTION(parentFrame, + "no normal ancestor found for ib-split frame " + "in GetIBContainingBlockFor"); + NS_ASSERTION(parentFrame != aFrame, + "parentFrame is actually the child frame - bogus reslt"); + + return parentFrame; +} + +// Find the multicol containing block suitable for reframing. +// +// Note: this function may not return a ColumnSetWrapperFrame. For example, if +// the multicol containing block has "overflow:scroll" style, HTMLScrollFrame is +// returned because ColumnSetWrapperFrame is the scrolled frame which has the +// -moz-scrolled-content pseudo style. We may walk up "too far", but in terms of +// correctness of reframing, it's OK. +static nsContainerFrame* GetMultiColumnContainingBlockFor(nsIFrame* aFrame) { + MOZ_ASSERT(aFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR), + "Should only be called if the frame has a multi-column ancestor!"); + + nsContainerFrame* current = aFrame->GetParent(); + while (current && + (current->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) || + current->Style()->IsPseudoOrAnonBox())) { + current = current->GetParent(); + } + + MOZ_ASSERT(current, + "No multicol containing block in a valid column hierarchy?"); + + return current; +} + +// This is a bit slow, but sometimes we need it. +static bool ParentIsWrapperAnonBox(nsIFrame* aParent) { + nsIFrame* maybeAnonBox = aParent; + if (maybeAnonBox->Style()->GetPseudoType() == PseudoStyleType::cellContent) { + // The thing that would maybe be a wrapper anon box is the cell. + maybeAnonBox = maybeAnonBox->GetParent(); + } + return maybeAnonBox->Style()->IsWrapperAnonBox(); +} + +//---------------------------------------------------------------------- + +// Block/inline frame construction logic. We maintain a few invariants here: +// +// 1. Block frames contain block and inline frames. +// +// 2. Inline frames only contain inline frames. If an inline parent has a block +// child then the block child is migrated upward until it lands in a block +// parent (the inline frames containing block is where it will end up). + +inline void SetInitialSingleChild(nsContainerFrame* aParent, nsIFrame* aFrame) { + MOZ_ASSERT(!aFrame->GetNextSibling(), "Should be using a frame list"); + aParent->SetInitialChildList(FrameChildListID::Principal, + nsFrameList(aFrame, aFrame)); +} + +// ----------------------------------------------------------- + +// Structure used when constructing formatting object trees. Contains +// state information needed for absolutely positioned elements +namespace mozilla { +struct AbsoluteFrameList final : public nsFrameList { + // Containing block for absolutely positioned elements. + nsContainerFrame* mContainingBlock; + + explicit AbsoluteFrameList(nsContainerFrame* aContainingBlock = nullptr) + : mContainingBlock(aContainingBlock) {} + + // Transfer frames in aOther to this list. aOther becomes empty after this + // operation. + AbsoluteFrameList(AbsoluteFrameList&& aOther) = default; + AbsoluteFrameList& operator=(AbsoluteFrameList&& aOther) = default; + +#ifdef DEBUG + // XXXbz Does this need a debug-only assignment operator that nulls out the + // childList in the AbsoluteFrameList we're copying? Introducing a difference + // between debug and non-debug behavior seems bad, so I guess not... + ~AbsoluteFrameList() { + NS_ASSERTION(!FirstChild(), + "Dangling child list. Someone forgot to insert it?"); + } +#endif +}; +} // namespace mozilla + +// ----------------------------------------------------------- + +// Structure for saving the existing state when pushing/poping containing +// blocks. The destructor restores the state to its previous state +class MOZ_STACK_CLASS nsFrameConstructorSaveState { + public: + ~nsFrameConstructorSaveState(); + + private: + // Pointer to struct whose data we save/restore. + AbsoluteFrameList* mList = nullptr; + + // Copy of original frame list. This can be the original absolute list or a + // float list. If we're saving the abs-pos state for a transformed element, + // i.e. when mSavedFixedPosIsAbsPos is true, this is the original fixed list. + AbsoluteFrameList mSavedList; + + // The name of the child list in which our frames would belong. + mozilla::FrameChildListID mChildListID = FrameChildListID::Principal; + nsFrameConstructorState* mState = nullptr; + + // Only used when saving an absolute list. See the description of + // nsFrameConstructorState::mFixedPosIsAbsPos for its meaning. + bool mSavedFixedPosIsAbsPos = false; + + friend class nsFrameConstructorState; +}; + +// Structure used for maintaining state information during the +// frame construction process +class MOZ_STACK_CLASS nsFrameConstructorState { + public: + nsPresContext* mPresContext; + PresShell* mPresShell; + nsFrameManager* mFrameManager; + + // Containing block information for out-of-flow frames. + AbsoluteFrameList mFixedList; + AbsoluteFrameList mAbsoluteList; + AbsoluteFrameList mFloatedList; + // The containing block of a frame in the top layer is defined by the + // spec: fixed-positioned frames are children of the viewport frame, + // and absolutely-positioned frames are children of the initial + // containing block. They would not be caught by any other containing + // block, e.g. frames with transform or filter. + AbsoluteFrameList mTopLayerFixedList; + AbsoluteFrameList mTopLayerAbsoluteList; + + // What `page: auto` resolves to. This is the used page-name of the parent + // frame. Updated by AutoFrameConstructionPageName. + const nsAtom* mAutoPageNameValue; + + nsCOMPtr<nsILayoutHistoryState> mFrameState; + // These bits will be added to the state bits of any frame we construct + // using this state. + nsFrameState mAdditionalStateBits; + + // When working with transform / filter properties, we want to hook the + // abs-pos and fixed-pos lists together, since such elements are fixed-pos + // containing blocks. + // + // Similarly when restricting absolute positioning (for e.g. mathml). + // + // This flag determines whether or not we want to wire the fixed-pos and + // abs-pos lists together. + bool mFixedPosIsAbsPos; + + // If false (which is the default) then call SetPrimaryFrame() as needed + // during frame construction. If true, don't make any SetPrimaryFrame() + // calls, except for generated content which doesn't have a primary frame + // yet. The mCreatingExtraFrames == true mode is meant to be used for + // construction of random "extra" frames for elements via normal frame + // construction APIs (e.g. replication of things across pages in paginated + // mode). + bool mCreatingExtraFrames; + + // This keeps track of whether we have found a "rendered legend" for + // the current FieldSetFrame. + bool mHasRenderedLegend; + + nsTArray<RefPtr<nsIContent>> mGeneratedContentWithInitializer; + +#ifdef DEBUG + // Record the float containing block candidate passed into + // MaybePushFloatContainingBlock() to keep track that we've call the method to + // handle the float CB scope before processing the CB's children. It is reset + // in ConstructFramesFromItemList(). + nsContainerFrame* mFloatCBCandidate = nullptr; +#endif + + // Constructor + // Use the passed-in history state. + nsFrameConstructorState( + PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock, + nsContainerFrame* aAbsoluteContainingBlock, + nsContainerFrame* aFloatContainingBlock, + already_AddRefed<nsILayoutHistoryState> aHistoryState); + // Get the history state from the pres context's pres shell. + nsFrameConstructorState(PresShell* aPresShell, + nsContainerFrame* aFixedContainingBlock, + nsContainerFrame* aAbsoluteContainingBlock, + nsContainerFrame* aFloatContainingBlock); + + ~nsFrameConstructorState(); + + // Process the frame insertions for all the out-of-flow nsAbsoluteItems. + void ProcessFrameInsertionsForAllLists(); + + // Function to push the existing absolute containing block state and + // create a new scope. Code that uses this function should get matching + // logic in GetAbsoluteContainingBlock. + // Also makes aNewAbsoluteContainingBlock the containing block for + // fixed-pos elements if necessary. + // aPositionedFrame is the frame whose style actually makes + // aNewAbsoluteContainingBlock a containing block. E.g. for a scrollable + // element aPositionedFrame is the element's primary frame and + // aNewAbsoluteContainingBlock is the scrolled frame. + void PushAbsoluteContainingBlock( + nsContainerFrame* aNewAbsoluteContainingBlock, nsIFrame* aPositionedFrame, + nsFrameConstructorSaveState& aSaveState); + + // Function to forbid floats descendants under aFloatCBCandidate, or open a + // new float containing block scope for aFloatCBCandidate. The current + // state is saved in aSaveState if a new scope is pushed. + void MaybePushFloatContainingBlock(nsContainerFrame* aFloatCBCandidate, + nsFrameConstructorSaveState& aSaveState); + + // Helper function for MaybePushFloatContainingBlock(). + void PushFloatContainingBlock(nsContainerFrame* aNewFloatContainingBlock, + nsFrameConstructorSaveState& aSaveState); + + // Function to return the proper geometric parent for a frame with display + // struct given by aStyleDisplay and parent's frame given by + // aContentParentFrame. + nsContainerFrame* GetGeometricParent( + const nsStyleDisplay& aStyleDisplay, + nsContainerFrame* aContentParentFrame) const; + + // Collect absolute frames in mAbsoluteList which are proper descendants + // of aNewParent, and reparent them to aNewParent. + // + // Note: This function does something unusual that moves absolute items + // after their frames are constructed under a column hierarchy which has + // column-span elements. Do not use this if you're not dealing with + // columns. + void ReparentAbsoluteItems(nsContainerFrame* aNewParent); + + // Collect floats in mFloatedList which are proper descendants of aNewParent, + // and reparent them to aNewParent. + // + // Note: This function does something unusual that moves floats after their + // frames are constructed under a column hierarchy which has column-span + // elements. Do not use this if you're not dealing with columns. + void ReparentFloats(nsContainerFrame* aNewParent); + + /** + * Function to add a new frame to the right frame list. This MUST be called + * on frames before their children have been processed if the frames might + * conceivably be out-of-flow; otherwise cleanup in error cases won't work + * right. Also, this MUST be called on frames after they have been + * initialized. + * @param aNewFrame the frame to add + * @param aFrameList the list to add in-flow frames to + * @param aContent the content pointer for aNewFrame + * @param aParentFrame the parent frame for the content if it were in-flow + * @param aCanBePositioned pass false if the frame isn't allowed to be + * positioned + * @param aCanBeFloated pass false if the frame isn't allowed to be + * floated + */ + void AddChild(nsIFrame* aNewFrame, nsFrameList& aFrameList, + nsIContent* aContent, nsContainerFrame* aParentFrame, + bool aCanBePositioned = true, bool aCanBeFloated = true, + bool aInsertAfter = false, + nsIFrame* aInsertAfterFrame = nullptr); + + /** + * Function to return the fixed-pos element list. Normally this will just + * hand back the fixed-pos element list, but in case we're dealing with a + * transformed element that's acting as an abs-pos and fixed-pos container, + * we'll hand back the abs-pos list. Callers should use this function if they + * want to get the list acting as the fixed-pos item parent. + */ + AbsoluteFrameList& GetFixedList() { + return mFixedPosIsAbsPos ? mAbsoluteList : mFixedList; + } + const AbsoluteFrameList& GetFixedList() const { + return mFixedPosIsAbsPos ? mAbsoluteList : mFixedList; + } + + protected: + friend class nsFrameConstructorSaveState; + + /** + * ProcessFrameInsertions takes the frames in aFrameList and adds them as + * kids to the aChildListID child list of |aFrameList.containingBlock|. + */ + void ProcessFrameInsertions(AbsoluteFrameList& aFrameList, + mozilla::FrameChildListID aChildListID); + + /** + * GetOutOfFlowFrameList selects the out-of-flow frame list the new + * frame should be added to. If the frame shouldn't be added to any + * out-of-flow list, it returns nullptr. The corresponding type of + * placeholder is also returned via the aPlaceholderType parameter + * if this method doesn't return nullptr. The caller should check + * whether the returned list really has a containing block. + */ + AbsoluteFrameList* GetOutOfFlowFrameList(nsIFrame* aNewFrame, + bool aCanBePositioned, + bool aCanBeFloated, + nsFrameState* aPlaceholderType); + + void ConstructBackdropFrameFor(nsIContent* aContent, nsIFrame* aFrame); +}; + +nsFrameConstructorState::nsFrameConstructorState( + PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock, + nsContainerFrame* aAbsoluteContainingBlock, + nsContainerFrame* aFloatContainingBlock, + already_AddRefed<nsILayoutHistoryState> aHistoryState) + : mPresContext(aPresShell->GetPresContext()), + mPresShell(aPresShell), + mFrameManager(aPresShell->FrameConstructor()), + mFixedList(aFixedContainingBlock), + mAbsoluteList(aAbsoluteContainingBlock), + mFloatedList(aFloatContainingBlock), + mTopLayerFixedList( + static_cast<nsContainerFrame*>(mFrameManager->GetRootFrame())), + mTopLayerAbsoluteList( + aPresShell->FrameConstructor()->GetDocElementContainingBlock()), + // Will be set by AutoFrameConstructionPageName + mAutoPageNameValue(nullptr), + // See PushAbsoluteContaningBlock below + mFrameState(aHistoryState), + mAdditionalStateBits(nsFrameState(0)), + // If the fixed-pos containing block is equal to the abs-pos containing + // block, use the abs-pos containing block's abs-pos list for fixed-pos + // frames. + mFixedPosIsAbsPos(aFixedContainingBlock == aAbsoluteContainingBlock), + mCreatingExtraFrames(false), + mHasRenderedLegend(false) { + MOZ_COUNT_CTOR(nsFrameConstructorState); +} + +nsFrameConstructorState::nsFrameConstructorState( + PresShell* aPresShell, nsContainerFrame* aFixedContainingBlock, + nsContainerFrame* aAbsoluteContainingBlock, + nsContainerFrame* aFloatContainingBlock) + : nsFrameConstructorState( + aPresShell, aFixedContainingBlock, aAbsoluteContainingBlock, + aFloatContainingBlock, + aPresShell->GetDocument()->GetLayoutHistoryState()) {} + +nsFrameConstructorState::~nsFrameConstructorState() { + MOZ_COUNT_DTOR(nsFrameConstructorState); + ProcessFrameInsertionsForAllLists(); + for (auto& content : Reversed(mGeneratedContentWithInitializer)) { + content->RemoveProperty(nsGkAtoms::genConInitializerProperty); + } +} + +void nsFrameConstructorState::ProcessFrameInsertionsForAllLists() { + ProcessFrameInsertions(mTopLayerFixedList, FrameChildListID::Fixed); + ProcessFrameInsertions(mTopLayerAbsoluteList, FrameChildListID::Absolute); + ProcessFrameInsertions(mFloatedList, FrameChildListID::Float); + ProcessFrameInsertions(mAbsoluteList, FrameChildListID::Absolute); + ProcessFrameInsertions(mFixedList, FrameChildListID::Fixed); +} + +void nsFrameConstructorState::PushAbsoluteContainingBlock( + nsContainerFrame* aNewAbsoluteContainingBlock, nsIFrame* aPositionedFrame, + nsFrameConstructorSaveState& aSaveState) { + MOZ_ASSERT(!!aNewAbsoluteContainingBlock == !!aPositionedFrame, + "We should have both or none"); + aSaveState.mList = &mAbsoluteList; + aSaveState.mChildListID = FrameChildListID::Absolute; + aSaveState.mState = this; + aSaveState.mSavedFixedPosIsAbsPos = mFixedPosIsAbsPos; + + if (mFixedPosIsAbsPos) { + // Since we're going to replace mAbsoluteList, we need to save it into + // mFixedList now (and save the current value of mFixedList). + aSaveState.mSavedList = std::move(mFixedList); + mFixedList = std::move(mAbsoluteList); + } else { + // Otherwise, we just save mAbsoluteList. + aSaveState.mSavedList = std::move(mAbsoluteList); + } + + mAbsoluteList = AbsoluteFrameList(aNewAbsoluteContainingBlock); + + /* See if we're wiring the fixed-pos and abs-pos lists together. This happens + * if we're a transformed/filtered/etc element, or if we force a null abspos + * containing block (for mathml for example). + */ + mFixedPosIsAbsPos = + !aPositionedFrame || aPositionedFrame->IsFixedPosContainingBlock(); + + if (aNewAbsoluteContainingBlock) { + aNewAbsoluteContainingBlock->MarkAsAbsoluteContainingBlock(); + } +} + +void nsFrameConstructorState::MaybePushFloatContainingBlock( + nsContainerFrame* aFloatCBCandidate, + nsFrameConstructorSaveState& aSaveState) { + // The logic here needs to match the logic in GetFloatContainingBlock(). + if (ShouldSuppressFloatingOfDescendants(aFloatCBCandidate)) { + // Pushing a null float containing block forbids any frames from being + // floated until a new float containing block is pushed. See implementation + // of nsFrameConstructorState::AddChild(). + // + // XXX we should get rid of null float containing blocks and teach the + // various frame classes to deal with floats instead. + PushFloatContainingBlock(nullptr, aSaveState); + } else if (aFloatCBCandidate->IsFloatContainingBlock()) { + PushFloatContainingBlock(aFloatCBCandidate, aSaveState); + } + +#ifdef DEBUG + mFloatCBCandidate = aFloatCBCandidate; +#endif +} + +void nsFrameConstructorState::PushFloatContainingBlock( + nsContainerFrame* aNewFloatContainingBlock, + nsFrameConstructorSaveState& aSaveState) { + MOZ_ASSERT(!aNewFloatContainingBlock || + aNewFloatContainingBlock->IsFloatContainingBlock(), + "Please push a real float containing block!"); + NS_ASSERTION( + !aNewFloatContainingBlock || + !ShouldSuppressFloatingOfDescendants(aNewFloatContainingBlock), + "We should not push a frame that is supposed to _suppress_ " + "floats as a float containing block!"); + aSaveState.mList = &mFloatedList; + aSaveState.mSavedList = std::move(mFloatedList); + aSaveState.mChildListID = FrameChildListID::Float; + aSaveState.mState = this; + mFloatedList = AbsoluteFrameList(aNewFloatContainingBlock); +} + +nsContainerFrame* nsFrameConstructorState::GetGeometricParent( + const nsStyleDisplay& aStyleDisplay, + nsContainerFrame* aContentParentFrame) const { + // If there is no container for a fixed, absolute, or floating root + // frame, we will ignore the positioning. This hack is originally + // brought to you by the letter T: tables, since other roots don't + // even call into this code. See bug 178855. + // + // XXX Disabling positioning in this case is a hack. If one was so inclined, + // one could support this either by (1) inserting a dummy block between the + // table and the canvas or (2) teaching the canvas how to reflow positioned + // elements. (1) has the usual problems when multiple frames share the same + // content (notice all the special cases in this file dealing with inner + // tables and table wrappers which share the same content). (2) requires some + // work and possible factoring. + // + // XXXbz couldn't we just force position to "static" on roots and + // float to "none"? That's OK per CSS 2.1, as far as I can tell. + + if (aContentParentFrame && + SVGUtils::IsInSVGTextSubtree(aContentParentFrame)) { + return aContentParentFrame; + } + + if (aStyleDisplay.IsFloatingStyle() && mFloatedList.mContainingBlock) { + NS_ASSERTION(!aStyleDisplay.IsAbsolutelyPositionedStyle(), + "Absolutely positioned _and_ floating?"); + return mFloatedList.mContainingBlock; + } + + if (aStyleDisplay.mTopLayer != StyleTopLayer::None) { + MOZ_ASSERT(aStyleDisplay.mTopLayer == StyleTopLayer::Top, + "-moz-top-layer should be either none or top"); + MOZ_ASSERT(aStyleDisplay.IsAbsolutelyPositionedStyle(), + "Top layer items should always be absolutely positioned"); + if (aStyleDisplay.mPosition == StylePositionProperty::Fixed) { + MOZ_ASSERT(mTopLayerFixedList.mContainingBlock, "No root frame?"); + return mTopLayerFixedList.mContainingBlock; + } + MOZ_ASSERT(aStyleDisplay.mPosition == StylePositionProperty::Absolute); + MOZ_ASSERT(mTopLayerAbsoluteList.mContainingBlock); + return mTopLayerAbsoluteList.mContainingBlock; + } + + if (aStyleDisplay.mPosition == StylePositionProperty::Absolute && + mAbsoluteList.mContainingBlock) { + return mAbsoluteList.mContainingBlock; + } + + if (aStyleDisplay.mPosition == StylePositionProperty::Fixed && + GetFixedList().mContainingBlock) { + return GetFixedList().mContainingBlock; + } + + return aContentParentFrame; +} + +void nsFrameConstructorState::ReparentAbsoluteItems( + nsContainerFrame* aNewParent) { + // Bug 1491727: This function might not conform to the spec. See + // https://github.com/w3c/csswg-drafts/issues/1894. + + MOZ_ASSERT(aNewParent->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR), + "Restrict the usage under column hierarchy."); + + AbsoluteFrameList newAbsoluteItems(aNewParent); + + nsIFrame* current = mAbsoluteList.FirstChild(); + while (current) { + nsIFrame* placeholder = current->GetPlaceholderFrame(); + + if (nsLayoutUtils::IsProperAncestorFrame(aNewParent, placeholder)) { + nsIFrame* next = current->GetNextSibling(); + mAbsoluteList.RemoveFrame(current); + newAbsoluteItems.AppendFrame(aNewParent, current); + current = next; + } else { + current = current->GetNextSibling(); + } + } + + if (newAbsoluteItems.NotEmpty()) { + // ~nsFrameConstructorSaveState() will move newAbsoluteItems to + // aNewParent's absolute child list. + nsFrameConstructorSaveState absoluteSaveState; + + // It doesn't matter whether aNewParent has position style or not. Caller + // won't call us if we can't have absolute children. + PushAbsoluteContainingBlock(aNewParent, aNewParent, absoluteSaveState); + mAbsoluteList = std::move(newAbsoluteItems); + } +} + +void nsFrameConstructorState::ReparentFloats(nsContainerFrame* aNewParent) { + MOZ_ASSERT(aNewParent->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR), + "Restrict the usage under column hierarchy."); + MOZ_ASSERT( + aNewParent->IsFloatContainingBlock(), + "Why calling this method if aNewParent is not a float containing block?"); + + // Gather floats that should reparent under aNewParent. + AbsoluteFrameList floats(aNewParent); + nsIFrame* current = mFloatedList.FirstChild(); + while (current) { + nsIFrame* placeholder = current->GetPlaceholderFrame(); + nsIFrame* next = current->GetNextSibling(); + if (nsLayoutUtils::IsProperAncestorFrame(aNewParent, placeholder)) { + mFloatedList.RemoveFrame(current); + floats.AppendFrame(aNewParent, current); + } + current = next; + } + + if (floats.NotEmpty()) { + // Make floats move into aNewParent's float child list in + // ~nsFrameConstructorSaveState() when destructing floatSaveState. + nsFrameConstructorSaveState floatSaveState; + PushFloatContainingBlock(aNewParent, floatSaveState); + mFloatedList = std::move(floats); + } +} + +AbsoluteFrameList* nsFrameConstructorState::GetOutOfFlowFrameList( + nsIFrame* aNewFrame, bool aCanBePositioned, bool aCanBeFloated, + nsFrameState* aPlaceholderType) { + const nsStyleDisplay* disp = aNewFrame->StyleDisplay(); + if (aCanBeFloated && disp->IsFloatingStyle()) { + *aPlaceholderType = PLACEHOLDER_FOR_FLOAT; + return &mFloatedList; + } + + if (aCanBePositioned) { + if (disp->mTopLayer != StyleTopLayer::None) { + *aPlaceholderType = PLACEHOLDER_FOR_TOPLAYER; + if (disp->mPosition == StylePositionProperty::Fixed) { + *aPlaceholderType |= PLACEHOLDER_FOR_FIXEDPOS; + return &mTopLayerFixedList; + } + *aPlaceholderType |= PLACEHOLDER_FOR_ABSPOS; + return &mTopLayerAbsoluteList; + } + if (disp->mPosition == StylePositionProperty::Absolute) { + *aPlaceholderType = PLACEHOLDER_FOR_ABSPOS; + return &mAbsoluteList; + } + if (disp->mPosition == StylePositionProperty::Fixed) { + *aPlaceholderType = PLACEHOLDER_FOR_FIXEDPOS; + return &GetFixedList(); + } + } + return nullptr; +} + +void nsFrameConstructorState::ConstructBackdropFrameFor(nsIContent* aContent, + nsIFrame* aFrame) { + MOZ_ASSERT(aFrame->StyleDisplay()->mTopLayer == StyleTopLayer::Top); + nsContainerFrame* frame = do_QueryFrame(aFrame); + if (!frame) { + NS_WARNING("Cannot create backdrop frame for non-container frame"); + return; + } + + RefPtr<ComputedStyle> style = + mPresShell->StyleSet()->ResolvePseudoElementStyle( + *aContent->AsElement(), PseudoStyleType::backdrop, + /* aParentStyle */ nullptr); + MOZ_ASSERT(style->StyleDisplay()->mTopLayer == StyleTopLayer::Top); + nsContainerFrame* parentFrame = + GetGeometricParent(*style->StyleDisplay(), nullptr); + + nsBackdropFrame* backdropFrame = + new (mPresShell) nsBackdropFrame(style, mPresShell->GetPresContext()); + backdropFrame->Init(aContent, parentFrame, nullptr); + + nsFrameState placeholderType; + AbsoluteFrameList* frameList = + GetOutOfFlowFrameList(backdropFrame, true, true, &placeholderType); + MOZ_ASSERT(placeholderType & PLACEHOLDER_FOR_TOPLAYER); + + nsIFrame* placeholder = nsCSSFrameConstructor::CreatePlaceholderFrameFor( + mPresShell, aContent, backdropFrame, frame, nullptr, placeholderType); + frame->SetInitialChildList(FrameChildListID::Backdrop, + nsFrameList(placeholder, placeholder)); + + frameList->AppendFrame(nullptr, backdropFrame); +} + +void nsFrameConstructorState::AddChild( + nsIFrame* aNewFrame, nsFrameList& aFrameList, nsIContent* aContent, + nsContainerFrame* aParentFrame, bool aCanBePositioned, bool aCanBeFloated, + bool aInsertAfter, nsIFrame* aInsertAfterFrame) { + MOZ_ASSERT(!aNewFrame->GetNextSibling(), "Shouldn't happen"); + + nsFrameState placeholderType; + AbsoluteFrameList* outOfFlowFrameList = GetOutOfFlowFrameList( + aNewFrame, aCanBePositioned, aCanBeFloated, &placeholderType); + + // The comments in GetGeometricParent regarding root table frames + // all apply here, unfortunately. Thus, we need to check whether + // the returned frame items really has containing block. + nsFrameList* frameList; + if (outOfFlowFrameList && outOfFlowFrameList->mContainingBlock) { + MOZ_ASSERT(aNewFrame->GetParent() == outOfFlowFrameList->mContainingBlock, + "Parent of the frame is not the containing block?"); + frameList = outOfFlowFrameList; + } else { + frameList = &aFrameList; + placeholderType = nsFrameState(0); + } + + if (placeholderType) { + NS_ASSERTION(frameList != &aFrameList, + "Putting frame in-flow _and_ want a placeholder?"); + nsIFrame* placeholderFrame = + nsCSSFrameConstructor::CreatePlaceholderFrameFor( + mPresShell, aContent, aNewFrame, aParentFrame, nullptr, + placeholderType); + + placeholderFrame->AddStateBits(mAdditionalStateBits); + // Add the placeholder frame to the flow + aFrameList.AppendFrame(nullptr, placeholderFrame); + + if (placeholderType & PLACEHOLDER_FOR_TOPLAYER) { + ConstructBackdropFrameFor(aContent, aNewFrame); + } + } +#ifdef DEBUG + else { + NS_ASSERTION(aNewFrame->GetParent() == aParentFrame, + "In-flow frame has wrong parent"); + } +#endif + + if (aInsertAfter) { + frameList->InsertFrame(nullptr, aInsertAfterFrame, aNewFrame); + } else { + frameList->AppendFrame(nullptr, aNewFrame); + } +} + +// Some of this function's callers recurse 1000 levels deep in crashtests. On +// platforms where stack limits are low, we can't afford to incorporate this +// function's `AutoTArray`s into its callers' stack frames, so disable inlining. +MOZ_NEVER_INLINE void nsFrameConstructorState::ProcessFrameInsertions( + AbsoluteFrameList& aFrameList, FrameChildListID aChildListID) { +#define NS_NONXUL_LIST_TEST \ + (&aFrameList == &mFloatedList && aChildListID == FrameChildListID::Float) || \ + ((&aFrameList == &mAbsoluteList || \ + &aFrameList == &mTopLayerAbsoluteList) && \ + aChildListID == FrameChildListID::Absolute) || \ + ((&aFrameList == &mFixedList || &aFrameList == &mTopLayerFixedList) && \ + aChildListID == FrameChildListID::Fixed) + MOZ_ASSERT(NS_NONXUL_LIST_TEST, + "Unexpected aFrameList/aChildListID combination"); + + if (aFrameList.IsEmpty()) { + return; + } + + nsContainerFrame* containingBlock = aFrameList.mContainingBlock; + + NS_ASSERTION(containingBlock, "Child list without containing block?"); + + if (aChildListID == FrameChildListID::Fixed) { + // Put this frame on the transformed-frame's abs-pos list instead, if + // it has abs-pos children instead of fixed-pos children. + aChildListID = containingBlock->GetAbsoluteListID(); + } + + // Insert the frames hanging out in aItems. We can use SetInitialChildList() + // if the containing block hasn't been reflowed yet (so NS_FRAME_FIRST_REFLOW + // is set) and doesn't have any frames in the aChildListID child list yet. + const nsFrameList& childList = containingBlock->GetChildList(aChildListID); + if (childList.IsEmpty() && + containingBlock->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + // If we're injecting absolutely positioned frames, inject them on the + // absolute containing block + if (aChildListID == containingBlock->GetAbsoluteListID()) { + containingBlock->GetAbsoluteContainingBlock()->SetInitialChildList( + containingBlock, aChildListID, std::move(aFrameList)); + } else { + containingBlock->SetInitialChildList(aChildListID, std::move(aFrameList)); + } + } else if (aChildListID == FrameChildListID::Fixed || + aChildListID == FrameChildListID::Absolute) { + // The order is not important for abs-pos/fixed-pos frame list, just + // append the frame items to the list directly. + mFrameManager->AppendFrames(containingBlock, aChildListID, + std::move(aFrameList)); + } else { + // Note that whether the frame construction context is doing an append or + // not is not helpful here, since it could be appending to some frame in + // the middle of the document, which means we're not necessarily + // appending to the children of the containing block. + // + // We need to make sure the 'append to the end of document' case is fast. + // So first test the last child of the containing block + nsIFrame* lastChild = childList.LastChild(); + + // CompareTreePosition uses placeholder hierarchy for out of flow frames, + // so this will make out-of-flows respect the ordering of placeholders, + // which is great because it takes care of anonymous content. + nsIFrame* firstNewFrame = aFrameList.FirstChild(); + + // Cache the ancestor chain so that we can reuse it if needed. + AutoTArray<nsIFrame*, 20> firstNewFrameAncestors; + nsIFrame* notCommonAncestor = nullptr; + if (lastChild) { + notCommonAncestor = nsLayoutUtils::FillAncestors( + firstNewFrame, containingBlock, &firstNewFrameAncestors); + } + + if (!lastChild || nsLayoutUtils::CompareTreePosition( + lastChild, firstNewFrame, firstNewFrameAncestors, + notCommonAncestor ? containingBlock : nullptr) < 0) { + // no lastChild, or lastChild comes before the new children, so just + // append + mFrameManager->AppendFrames(containingBlock, aChildListID, + std::move(aFrameList)); + } else { + // Try the other children. First collect them to an array so that a + // reasonable fast binary search can be used to find the insertion point. + AutoTArray<nsIFrame*, 128> children; + for (nsIFrame* f = childList.FirstChild(); f != lastChild; + f = f->GetNextSibling()) { + children.AppendElement(f); + } + + nsIFrame* insertionPoint = nullptr; + int32_t imin = 0; + int32_t max = children.Length(); + while (max > imin) { + int32_t imid = imin + ((max - imin) / 2); + nsIFrame* f = children[imid]; + int32_t compare = nsLayoutUtils::CompareTreePosition( + f, firstNewFrame, firstNewFrameAncestors, + notCommonAncestor ? containingBlock : nullptr); + if (compare > 0) { + // f is after the new frame. + max = imid; + insertionPoint = imid > 0 ? children[imid - 1] : nullptr; + } else if (compare < 0) { + // f is before the new frame. + imin = imid + 1; + insertionPoint = f; + } else { + // This is for the old behavior. Should be removed once it is + // guaranteed that CompareTreePosition can't return 0! + // See bug 928645. + NS_WARNING("Something odd happening???"); + insertionPoint = nullptr; + for (uint32_t i = 0; i < children.Length(); ++i) { + nsIFrame* f = children[i]; + if (nsLayoutUtils::CompareTreePosition( + f, firstNewFrame, firstNewFrameAncestors, + notCommonAncestor ? containingBlock : nullptr) > 0) { + break; + } + insertionPoint = f; + } + break; + } + } + mFrameManager->InsertFrames(containingBlock, aChildListID, insertionPoint, + std::move(aFrameList)); + } + } + + MOZ_ASSERT(aFrameList.IsEmpty(), "How did that happen?"); +} + +nsFrameConstructorSaveState::~nsFrameConstructorSaveState() { + // Restore the state + if (mList) { + MOZ_ASSERT(mState, "Can't have mList set without having a state!"); + mState->ProcessFrameInsertions(*mList, mChildListID); + + if (mList == &mState->mAbsoluteList) { + mState->mFixedPosIsAbsPos = mSavedFixedPosIsAbsPos; + // mAbsoluteList was moved to mFixedList, so move mFixedList back + // and repair the old mFixedList now. + if (mSavedFixedPosIsAbsPos) { + mState->mAbsoluteList = std::move(mState->mFixedList); + mState->mFixedList = std::move(mSavedList); + } else { + mState->mAbsoluteList = std::move(mSavedList); + } + } else { + mState->mFloatedList = std::move(mSavedList); + } + + MOZ_ASSERT(mSavedList.IsEmpty(), + "Frames in mSavedList should've moved back into mState!"); + MOZ_ASSERT(!mList->LastChild() || !mList->LastChild()->GetNextSibling(), + "Something corrupted our list!"); + } +} + +/** + * Moves aFrameList from aOldParent to aNewParent. This updates the parent + * pointer of the frames in the list, and reparents their views as needed. + * nsIFrame::SetParent sets the NS_FRAME_HAS_VIEW bit on aNewParent and its + * ancestors as needed. Then it sets the list as the initial child list + * on aNewParent, unless aNewParent either already has kids or has been + * reflowed; in that case it appends the new frames. Note that this + * method differs from ReparentFrames in that it doesn't change the kids' + * style. + */ +// XXXbz Since this is only used for {ib} splits, could we just copy the view +// bits from aOldParent to aNewParent and then use the +// nsFrameList::ApplySetParent? That would still leave us doing two passes +// over the list, of course; if we really wanted to we could factor out the +// relevant part of ReparentFrameViewList, I suppose... Or just get rid of +// views, which would make most of this function go away. +static void MoveChildrenTo(nsIFrame* aOldParent, nsContainerFrame* aNewParent, + nsFrameList& aFrameList) { + bool sameGrandParent = aOldParent->GetParent() == aNewParent->GetParent(); + + if (aNewParent->HasView() || aOldParent->HasView() || !sameGrandParent) { + // Move the frames into the new view + nsContainerFrame::ReparentFrameViewList(aFrameList, aOldParent, aNewParent); + } + + aFrameList.ApplySetParent(aNewParent); + + if (aNewParent->PrincipalChildList().IsEmpty() && + aNewParent->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + aNewParent->SetInitialChildList(FrameChildListID::Principal, + std::move(aFrameList)); + } else { + aNewParent->AppendFrames(FrameChildListID::Principal, + std::move(aFrameList)); + } +} + +static bool MaybeApplyPageName(nsFrameConstructorState& aState, + const StylePageName& aPageName) { + if (aPageName.IsPageName()) { + aState.mAutoPageNameValue = aPageName.AsPageName().AsAtom(); + return true; + } + MOZ_ASSERT(aPageName.IsAuto(), "Impossible page name"); + return false; +} + +static void EnsureAutoPageName(nsFrameConstructorState& aState, + const nsContainerFrame* const aFrame) { + // Check if we need to figure out our used page name. + // When building the entire document, this should only happen for the + // root, which will mean the loop will immediately end. Either way, this will + // only happen once for each time the frame constructor is run. + if (aState.mAutoPageNameValue) { + return; + } + + for (const nsContainerFrame* frame = aFrame; frame; + frame = frame->GetParent()) { + const StylePageName& pageName = frame->StylePage()->mPage; + if (MaybeApplyPageName(aState, pageName)) { + return; + } + } + // Ensure that a root with `page: auto` gets an empty page name + // https://drafts.csswg.org/css-page-3/#using-named-pages + aState.mAutoPageNameValue = nsGkAtoms::_empty; +} + +nsCSSFrameConstructor::AutoFrameConstructionPageName:: + AutoFrameConstructionPageName(nsFrameConstructorState& aState, + nsIFrame* const aFrame) + : mState(aState), mNameToRestore(nullptr) { + if (!aState.mPresContext->IsPaginated() || + !StaticPrefs::layout_css_named_pages_enabled()) { + MOZ_ASSERT(!aState.mAutoPageNameValue, + "Page name should not have been set"); + return; + } +#ifdef DEBUG + MOZ_ASSERT(!aFrame->mWasVisitedByAutoFrameConstructionPageName, + "Frame should only have been visited once"); + aFrame->mWasVisitedByAutoFrameConstructionPageName = true; +#endif + + EnsureAutoPageName(aState, aFrame->GetParent()); + mNameToRestore = aState.mAutoPageNameValue; + + MOZ_ASSERT(mNameToRestore, + "Page name should have been found by EnsureAutoPageName"); + MaybeApplyPageName(aState, aFrame->StylePage()->mPage); + aFrame->SetAutoPageValue(aState.mAutoPageNameValue); +} + +nsCSSFrameConstructor::AutoFrameConstructionPageName:: + ~AutoFrameConstructionPageName() { + // This isn't actually useful when not in paginated layout or when + // layout.css.named-pages.enabled is false, but it's very likely cheaper to + // unconditionally write this pointer than to test for paginated layout and + // the value of the pref and then branch on the result. + mState.mAutoPageNameValue = mNameToRestore; +} + +//---------------------------------------------------------------------- + +nsCSSFrameConstructor::nsCSSFrameConstructor(Document* aDocument, + PresShell* aPresShell) + : nsFrameManager(aPresShell), + mDocument(aDocument), + mRootElementFrame(nullptr), + mRootElementStyleFrame(nullptr), + mDocElementContainingBlock(nullptr), + mPageSequenceFrame(nullptr), + mFirstFreeFCItem(nullptr), + mFCItemsInUse(0), + mCurrentDepth(0), + mQuotesDirty(false), + mCountersDirty(false), + mAlwaysCreateFramesForIgnorableWhitespace(false) { +#ifdef DEBUG + static bool gFirstTime = true; + if (gFirstTime) { + gFirstTime = false; + char* flags = PR_GetEnv("GECKO_FRAMECTOR_DEBUG_FLAGS"); + if (flags) { + bool error = false; + for (;;) { + char* comma = strchr(flags, ','); + if (comma) *comma = '\0'; + + bool found = false; + FrameCtorDebugFlags* flag = gFlags; + FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS; + while (flag < limit) { + if (nsCRT::strcasecmp(flag->name, flags) == 0) { + *(flag->on) = true; + printf("nsCSSFrameConstructor: setting %s debug flag on\n", + flag->name); + found = true; + break; + } + ++flag; + } + + if (!found) error = true; + + if (!comma) break; + + *comma = ','; + flags = comma + 1; + } + + if (error) { + printf("Here are the available GECKO_FRAMECTOR_DEBUG_FLAGS:\n"); + FrameCtorDebugFlags* flag = gFlags; + FrameCtorDebugFlags* limit = gFlags + NUM_DEBUG_FLAGS; + while (flag < limit) { + printf(" %s\n", flag->name); + ++flag; + } + printf( + "Note: GECKO_FRAMECTOR_DEBUG_FLAGS is a comma separated list of " + "flag\n"); + printf("names (no whitespace)\n"); + } + } + } +#endif +} + +void nsCSSFrameConstructor::NotifyDestroyingFrame(nsIFrame* aFrame) { + if (aFrame->HasAnyStateBits(NS_FRAME_GENERATED_CONTENT) && + mContainStyleScopeManager.DestroyQuoteNodesFor(aFrame)) { + QuotesDirty(); + } + + if (aFrame->HasAnyStateBits(NS_FRAME_HAS_CSS_COUNTER_STYLE) && + mContainStyleScopeManager.DestroyCounterNodesFor(aFrame)) { + // Technically we don't need to update anything if we destroyed only + // USE nodes. However, this is unlikely to happen in the real world + // since USE nodes generally go along with INCREMENT nodes. + CountersDirty(); + } + + if (aFrame->StyleDisplay()->IsContainStyle()) { + mContainStyleScopeManager.DestroyScopesFor(aFrame); + } + + RestyleManager()->NotifyDestroyingFrame(aFrame); +} + +struct nsGenConInitializer { + UniquePtr<nsGenConNode> mNode; + nsGenConList* mList; + void (nsCSSFrameConstructor::*mDirtyAll)(); + + nsGenConInitializer(UniquePtr<nsGenConNode> aNode, nsGenConList* aList, + void (nsCSSFrameConstructor::*aDirtyAll)()) + : mNode(std::move(aNode)), mList(aList), mDirtyAll(aDirtyAll) {} +}; + +already_AddRefed<nsIContent> nsCSSFrameConstructor::CreateGenConTextNode( + nsFrameConstructorState& aState, const nsAString& aString, + UniquePtr<nsGenConInitializer> aInitializer) { + RefPtr<nsTextNode> content = new (mDocument->NodeInfoManager()) + nsTextNode(mDocument->NodeInfoManager()); + content->SetText(aString, false); + if (aInitializer) { + aInitializer->mNode->mText = content; + content->SetProperty(nsGkAtoms::genConInitializerProperty, + aInitializer.release(), + nsINode::DeleteProperty<nsGenConInitializer>); + aState.mGeneratedContentWithInitializer.AppendElement(content); + } + return content.forget(); +} + +void nsCSSFrameConstructor::CreateGeneratedContent( + nsFrameConstructorState& aState, Element& aOriginatingElement, + ComputedStyle& aPseudoStyle, uint32_t aContentIndex, + const FunctionRef<void(nsIContent*)> aAddChild) { + using Type = StyleContentItem::Tag; + // Get the content value + const auto& item = aPseudoStyle.StyleContent()->ContentAt(aContentIndex); + const Type type = item.tag; + + switch (type) { + case Type::Image: { + RefPtr c = GeneratedImageContent::Create(*mDocument, aContentIndex); + aAddChild(c); + return; + } + + case Type::String: { + RefPtr text = CreateGenConTextNode( + aState, NS_ConvertUTF8toUTF16(item.AsString().AsString()), nullptr); + aAddChild(text); + return; + } + + case Type::Attr: { + const auto& attr = item.AsAttr(); + RefPtr<nsAtom> attrName = attr.attribute.AsAtom(); + int32_t attrNameSpace = kNameSpaceID_None; + RefPtr<nsAtom> ns = attr.namespace_url.AsAtom(); + if (!ns->IsEmpty()) { + nsresult rv = nsNameSpaceManager::GetInstance()->RegisterNameSpace( + ns.forget(), attrNameSpace); + NS_ENSURE_SUCCESS_VOID(rv); + } + + if (mDocument->IsHTMLDocument() && aOriginatingElement.IsHTMLElement()) { + ToLowerCaseASCII(attrName); + } + + nsCOMPtr<nsIContent> content; + NS_NewAttributeContent(mDocument->NodeInfoManager(), attrNameSpace, + attrName, getter_AddRefs(content)); + aAddChild(content); + return; + } + + case Type::Counter: + case Type::Counters: { + RefPtr<nsAtom> name; + CounterStylePtr ptr; + nsString separator; + if (type == Type::Counter) { + auto& counter = item.AsCounter(); + name = counter._0.AsAtom(); + ptr = CounterStylePtr::FromStyle(counter._1); + } else { + auto& counters = item.AsCounters(); + name = counters._0.AsAtom(); + CopyUTF8toUTF16(counters._1.AsString(), separator); + ptr = CounterStylePtr::FromStyle(counters._2); + } + + auto* counterList = mContainStyleScopeManager.GetOrCreateCounterList( + aOriginatingElement, name); + auto node = MakeUnique<nsCounterUseNode>( + std::move(ptr), std::move(separator), aContentIndex, + /* aAllCounters = */ type == Type::Counters); + + auto initializer = MakeUnique<nsGenConInitializer>( + std::move(node), counterList, &nsCSSFrameConstructor::CountersDirty); + RefPtr c = CreateGenConTextNode(aState, u""_ns, std::move(initializer)); + aAddChild(c); + return; + } + case Type::OpenQuote: + case Type::CloseQuote: + case Type::NoOpenQuote: + case Type::NoCloseQuote: { + auto node = MakeUnique<nsQuoteNode>(type, aContentIndex); + auto* quoteList = + mContainStyleScopeManager.QuoteListFor(aOriginatingElement); + auto initializer = MakeUnique<nsGenConInitializer>( + std::move(node), quoteList, &nsCSSFrameConstructor::QuotesDirty); + RefPtr c = CreateGenConTextNode(aState, u""_ns, std::move(initializer)); + aAddChild(c); + return; + } + + case Type::MozLabelContent: { + nsAutoString accesskey; + if (!aOriginatingElement.GetAttr(nsGkAtoms::accesskey, accesskey) || + accesskey.IsEmpty() || !nsMenuBarListener::GetMenuAccessKey()) { + // Easy path: just return a regular value attribute content. + nsCOMPtr<nsIContent> content; + NS_NewAttributeContent(mDocument->NodeInfoManager(), kNameSpaceID_None, + nsGkAtoms::value, getter_AddRefs(content)); + aAddChild(content); + return; + } + + nsAutoString value; + aOriginatingElement.GetAttr(nsGkAtoms::value, value); + + auto AppendAccessKeyLabel = [&] { + // Always append accesskey text in uppercase, see bug 1806167. + ToUpperCase(accesskey); + nsAutoString accessKeyLabel = u"("_ns + accesskey + u")"_ns; + if (!StringEndsWith(value, accessKeyLabel)) { + if (nsTextBoxFrame::InsertSeparatorBeforeAccessKey() && + !value.IsEmpty() && !NS_IS_SPACE(value.Last())) { + value.Append(' '); + } + value.Append(accessKeyLabel); + } + }; + if (nsTextBoxFrame::AlwaysAppendAccessKey()) { + AppendAccessKeyLabel(); + RefPtr c = CreateGenConTextNode(aState, value, nullptr); + aAddChild(c); + return; + } + + const auto accessKeyStart = [&]() -> Maybe<size_t> { + nsAString::const_iterator start, end; + value.BeginReading(start); + value.EndReading(end); + + const auto originalStart = start; + // not appending access key - do case-sensitive search + // first + bool found = true; + if (!FindInReadable(accesskey, start, end)) { + start = originalStart; + // didn't find it - perform a case-insensitive search + found = FindInReadable(accesskey, start, end, + nsCaseInsensitiveStringComparator); + } + if (!found) { + return Nothing(); + } + return Some(Distance(originalStart, start)); + }(); + + if (accessKeyStart.isNothing()) { + AppendAccessKeyLabel(); + RefPtr c = CreateGenConTextNode(aState, value, nullptr); + aAddChild(c); + return; + } + + if (*accessKeyStart != 0) { + RefPtr beginning = CreateGenConTextNode( + aState, Substring(value, 0, *accessKeyStart), nullptr); + aAddChild(beginning); + } + + { + RefPtr accessKeyText = CreateGenConTextNode( + aState, Substring(value, *accessKeyStart, accesskey.Length()), + nullptr); + RefPtr<nsIContent> underline = + mDocument->CreateHTMLElement(nsGkAtoms::u); + underline->AppendChildTo(accessKeyText, /* aNotify = */ false, + IgnoreErrors()); + aAddChild(underline); + } + + size_t accessKeyEnd = *accessKeyStart + accesskey.Length(); + if (accessKeyEnd != value.Length()) { + RefPtr valueEnd = CreateGenConTextNode( + aState, Substring(value, *accessKeyStart + accesskey.Length()), + nullptr); + aAddChild(valueEnd); + } + break; + } + case Type::MozAltContent: { + // Use the "alt" attribute; if that fails and the node is an HTML + // <input>, try the value attribute and then fall back to some default + // localized text we have. + // XXX what if the 'alt' attribute is added later, how will we + // detect that and do the right thing here? + if (aOriginatingElement.HasAttr(nsGkAtoms::alt)) { + nsCOMPtr<nsIContent> content; + NS_NewAttributeContent(mDocument->NodeInfoManager(), kNameSpaceID_None, + nsGkAtoms::alt, getter_AddRefs(content)); + aAddChild(content); + return; + } + + if (aOriginatingElement.IsHTMLElement(nsGkAtoms::input)) { + if (aOriginatingElement.HasAttr(nsGkAtoms::value)) { + nsCOMPtr<nsIContent> content; + NS_NewAttributeContent(mDocument->NodeInfoManager(), + kNameSpaceID_None, nsGkAtoms::value, + getter_AddRefs(content)); + aAddChild(content); + return; + } + + nsAutoString temp; + nsContentUtils::GetMaybeLocalizedString( + nsContentUtils::eFORMS_PROPERTIES, "Submit", mDocument, temp); + RefPtr c = CreateGenConTextNode(aState, temp, nullptr); + aAddChild(c); + return; + } + break; + } + } + + return; +} + +void nsCSSFrameConstructor::CreateGeneratedContentFromListStyle( + nsFrameConstructorState& aState, Element& aOriginatingElement, + const ComputedStyle& aPseudoStyle, + const FunctionRef<void(nsIContent*)> aAddChild) { + const nsStyleList* styleList = aPseudoStyle.StyleList(); + if (!styleList->mListStyleImage.IsNone()) { + RefPtr<nsIContent> child = + GeneratedImageContent::CreateForListStyleImage(*mDocument); + aAddChild(child); + child = CreateGenConTextNode(aState, u" "_ns, nullptr); + aAddChild(child); + return; + } + CreateGeneratedContentFromListStyleType(aState, aOriginatingElement, + aPseudoStyle, aAddChild); +} + +void nsCSSFrameConstructor::CreateGeneratedContentFromListStyleType( + nsFrameConstructorState& aState, Element& aOriginatingElement, + const ComputedStyle& aPseudoStyle, + const FunctionRef<void(nsIContent*)> aAddChild) { + const nsStyleList* styleList = aPseudoStyle.StyleList(); + CounterStyle* counterStyle = + mPresShell->GetPresContext()->CounterStyleManager()->ResolveCounterStyle( + styleList->mCounterStyle); + bool needUseNode = false; + switch (counterStyle->GetStyle()) { + case ListStyle::None: + return; + case ListStyle::Disc: + case ListStyle::Circle: + case ListStyle::Square: + case ListStyle::DisclosureClosed: + case ListStyle::DisclosureOpen: + break; + default: + const auto* anonStyle = counterStyle->AsAnonymous(); + if (!anonStyle || !anonStyle->IsSingleString()) { + needUseNode = true; + } + } + + auto node = MakeUnique<nsCounterUseNode>(nsCounterUseNode::ForLegacyBullet, + styleList->mCounterStyle); + if (!needUseNode) { + nsAutoString text; + node->GetText(WritingMode(&aPseudoStyle), counterStyle, text); + // Note that we're done with 'node' in this case. It's not inserted into + // any list so it's deleted when we return. + RefPtr<nsIContent> child = CreateGenConTextNode(aState, text, nullptr); + aAddChild(child); + return; + } + + auto* counterList = mContainStyleScopeManager.GetOrCreateCounterList( + aOriginatingElement, nsGkAtoms::list_item); + auto initializer = MakeUnique<nsGenConInitializer>( + std::move(node), counterList, &nsCSSFrameConstructor::CountersDirty); + RefPtr<nsIContent> child = + CreateGenConTextNode(aState, EmptyString(), std::move(initializer)); + aAddChild(child); +} + +// Frames for these may not be leaves in the proper sense, but we still don't +// want to expose generated content on them. For the purposes of the page they +// should be leaves. +static bool HasUAWidget(const Element& aOriginatingElement) { + const ShadowRoot* sr = aOriginatingElement.GetShadowRoot(); + return sr && sr->IsUAWidget(); +} + +/* + * aParentFrame - the frame that should be the parent of the generated + * content. This is the frame for the corresponding content node, + * which must not be a leaf frame. + * + * Any items created are added to aItems. + * + * We create an XML element (tag _moz_generated_content_before/after/marker) + * representing the pseudoelement. We create a DOM node for each 'content' + * item and make those nodes the children of the XML element. Then we create + * a frame subtree for the XML element as if it were a regular child of + * aParentFrame/aParentContent, giving the XML element the ::before, ::after + * or ::marker style. + */ +void nsCSSFrameConstructor::CreateGeneratedContentItem( + nsFrameConstructorState& aState, nsContainerFrame* aParentFrame, + Element& aOriginatingElement, ComputedStyle& aStyle, + PseudoStyleType aPseudoElement, FrameConstructionItemList& aItems, + ItemFlags aExtraFlags) { + MOZ_ASSERT(aPseudoElement == PseudoStyleType::before || + aPseudoElement == PseudoStyleType::after || + aPseudoElement == PseudoStyleType::marker, + "unexpected aPseudoElement"); + + if (HasUAWidget(aOriginatingElement) && + !aOriginatingElement.IsHTMLElement(nsGkAtoms::details)) { + return; + } + + ServoStyleSet* styleSet = mPresShell->StyleSet(); + + // Probe for the existence of the pseudo-element. + // |ProbePseudoElementStyle| checks the relevant properties for the pseudo. + // It only returns a non-null value if the pseudo should exist. + RefPtr<ComputedStyle> pseudoStyle = styleSet->ProbePseudoElementStyle( + aOriginatingElement, aPseudoElement, &aStyle); + if (!pseudoStyle) { + return; + } + + nsAtom* elemName = nullptr; + nsAtom* property = nullptr; + switch (aPseudoElement) { + case PseudoStyleType::before: + elemName = nsGkAtoms::mozgeneratedcontentbefore; + property = nsGkAtoms::beforePseudoProperty; + break; + case PseudoStyleType::after: + elemName = nsGkAtoms::mozgeneratedcontentafter; + property = nsGkAtoms::afterPseudoProperty; + break; + case PseudoStyleType::marker: + // We want to get a marker style even if we match no rules, but we still + // want to check the result of GeneratedContentPseudoExists. + elemName = nsGkAtoms::mozgeneratedcontentmarker; + property = nsGkAtoms::markerPseudoProperty; + break; + default: + MOZ_ASSERT_UNREACHABLE("unexpected aPseudoElement"); + } + + RefPtr<NodeInfo> nodeInfo = mDocument->NodeInfoManager()->GetNodeInfo( + elemName, nullptr, kNameSpaceID_None, nsINode::ELEMENT_NODE); + RefPtr<Element> container; + nsresult rv = NS_NewXMLElement(getter_AddRefs(container), nodeInfo.forget()); + if (NS_FAILED(rv)) { + return; + } + + // Cleared when the pseudo is unbound from the tree, so no need to store a + // strong reference, nor a destructor. + aOriginatingElement.SetProperty(property, container.get()); + + container->SetIsNativeAnonymousRoot(); + container->SetPseudoElementType(aPseudoElement); + + BindContext context(aOriginatingElement, BindContext::ForNativeAnonymous); + rv = container->BindToTree(context, aOriginatingElement); + if (NS_FAILED(rv)) { + container->UnbindFromTree(); + return; + } + + // Servo has already eagerly computed the style for the container, so we can + // just stick the style on the element and avoid an additional traversal. + // + // We don't do this for pseudos that may trigger animations or transitions, + // since those need to be kicked off by the traversal machinery. + // + // Note that when a pseudo-element animates, we flag the originating element, + // so we check that flag, but we could also a more expensive (but exhaustive) + // check using EffectSet::GetEffectSet, for example. + if (!Servo_ComputedValues_SpecifiesAnimationsOrTransitions(pseudoStyle) && + !aOriginatingElement.MayHaveAnimations()) { + Servo_SetExplicitStyle(container, pseudoStyle); + } else { + // If animations are involved, we avoid the SetExplicitStyle optimization + // above. We need to grab style with animations from the pseudo element and + // replace old one. + mPresShell->StyleSet()->StyleNewSubtree(container); + pseudoStyle = ServoStyleSet::ResolveServoStyle(*container); + } + + auto AppendChild = [&container, this](nsIContent* aChild) { + // We don't strictly have to set NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE + // here; it would get set under AppendChildTo. But AppendChildTo might + // think that we're going from not being anonymous to being anonymous and + // do some extra work; setting the flag here avoids that. + aChild->SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE); + container->AppendChildTo(aChild, false, IgnoreErrors()); + if (auto* childElement = Element::FromNode(aChild)) { + // If we created any children elements, Servo needs to traverse them, but + // the root is already set up. + mPresShell->StyleSet()->StyleNewSubtree(childElement); + } + }; + const uint32_t contentCount = pseudoStyle->StyleContent()->ContentCount(); + for (uint32_t contentIndex = 0; contentIndex < contentCount; contentIndex++) { + CreateGeneratedContent(aState, aOriginatingElement, *pseudoStyle, + contentIndex, AppendChild); + } + // If a ::marker has no 'content' then generate it from its 'list-style-*'. + if (contentCount == 0 && aPseudoElement == PseudoStyleType::marker) { + CreateGeneratedContentFromListStyle(aState, aOriginatingElement, + *pseudoStyle, AppendChild); + } + auto flags = ItemFlags{ItemFlag::IsGeneratedContent} + aExtraFlags; + AddFrameConstructionItemsInternal(aState, container, aParentFrame, true, + pseudoStyle, flags, aItems); +} + +/**************************************************** + ** BEGIN TABLE SECTION + ****************************************************/ + +// The term pseudo frame is being used instead of anonymous frame, since +// anonymous frame has been used elsewhere to refer to frames that have +// generated content + +// Return whether the given frame is a table pseudo-frame. Note that +// cell-content and table-outer frames have pseudo-types, but are always +// created, even for non-anonymous cells and tables respectively. So for those +// we have to examine the cell or table frame to see whether it's a pseudo +// frame. In particular, a lone table caption will have a table wrapper as its +// parent, but will also trigger construction of an empty inner table, which +// will be the one we can examine to see whether the wrapper was a pseudo-frame. +static bool IsTablePseudo(nsIFrame* aFrame) { + auto pseudoType = aFrame->Style()->GetPseudoType(); + return pseudoType != PseudoStyleType::NotPseudo && + (pseudoType == PseudoStyleType::table || + pseudoType == PseudoStyleType::inlineTable || + pseudoType == PseudoStyleType::tableColGroup || + pseudoType == PseudoStyleType::tableRowGroup || + pseudoType == PseudoStyleType::tableRow || + pseudoType == PseudoStyleType::tableCell || + (pseudoType == PseudoStyleType::cellContent && + aFrame->GetParent()->Style()->GetPseudoType() == + PseudoStyleType::tableCell) || + (pseudoType == PseudoStyleType::tableWrapper && + (aFrame->PrincipalChildList() + .FirstChild() + ->Style() + ->GetPseudoType() == PseudoStyleType::table || + aFrame->PrincipalChildList() + .FirstChild() + ->Style() + ->GetPseudoType() == PseudoStyleType::inlineTable))); +} + +static bool IsRubyPseudo(nsIFrame* aFrame) { + return RubyUtils::IsRubyPseudo(aFrame->Style()->GetPseudoType()); +} + +static bool IsTableOrRubyPseudo(nsIFrame* aFrame) { + return IsTablePseudo(aFrame) || IsRubyPseudo(aFrame); +} + +/* static */ +nsCSSFrameConstructor::ParentType nsCSSFrameConstructor::GetParentType( + LayoutFrameType aFrameType) { + if (aFrameType == LayoutFrameType::Table) { + return eTypeTable; + } + if (aFrameType == LayoutFrameType::TableRowGroup) { + return eTypeRowGroup; + } + if (aFrameType == LayoutFrameType::TableRow) { + return eTypeRow; + } + if (aFrameType == LayoutFrameType::TableColGroup) { + return eTypeColGroup; + } + if (aFrameType == LayoutFrameType::RubyBaseContainer) { + return eTypeRubyBaseContainer; + } + if (aFrameType == LayoutFrameType::RubyTextContainer) { + return eTypeRubyTextContainer; + } + if (aFrameType == LayoutFrameType::Ruby) { + return eTypeRuby; + } + + return eTypeBlock; +} + +// Pull all the captions present in aItems out into aCaptions. +static void PullOutCaptionFrames(nsFrameList& aList, nsFrameList& aCaptions) { + nsIFrame* child = aList.FirstChild(); + while (child) { + nsIFrame* nextSibling = child->GetNextSibling(); + if (child->StyleDisplay()->mDisplay == StyleDisplay::TableCaption) { + aList.RemoveFrame(child); + aCaptions.AppendFrame(nullptr, child); + } + child = nextSibling; + } +} + +// Construct the outer, inner table frames and the children frames for the +// table. +// XXX Page break frames for pseudo table frames are not constructed to avoid +// the risk associated with revising the pseudo frame mechanism. The long term +// solution of having frames handle page-break-before/after will solve the +// problem. +nsIFrame* nsCSSFrameConstructor::ConstructTable(nsFrameConstructorState& aState, + FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, + const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::Table || + aDisplay->mDisplay == StyleDisplay::InlineTable, + "Unexpected call"); + + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + const bool isMathMLContent = content->IsMathMLElement(); + + // create the pseudo SC for the table wrapper as a child of the inner SC + RefPtr<ComputedStyle> outerComputedStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::tableWrapper, computedStyle); + + // Create the table wrapper frame which holds the caption and inner table + // frame + nsContainerFrame* newFrame; + if (isMathMLContent) + newFrame = NS_NewMathMLmtableOuterFrame(mPresShell, outerComputedStyle); + else + newFrame = NS_NewTableWrapperFrame(mPresShell, outerComputedStyle); + + nsContainerFrame* geometricParent = aState.GetGeometricParent( + *outerComputedStyle->StyleDisplay(), aParentFrame); + + // Init the table wrapper frame + InitAndRestoreFrame(aState, content, geometricParent, newFrame); + + // Create the inner table frame + nsContainerFrame* innerFrame; + if (isMathMLContent) + innerFrame = NS_NewMathMLmtableFrame(mPresShell, computedStyle); + else + innerFrame = NS_NewTableFrame(mPresShell, computedStyle); + + InitAndRestoreFrame(aState, content, newFrame, innerFrame); + innerFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Put the newly created frames into the right child list + SetInitialSingleChild(newFrame, innerFrame); + + aState.AddChild(newFrame, aFrameList, content, aParentFrame); + + if (!mRootElementFrame) { + // The frame we're constructing will be the root element frame. + SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState, + aFrameList); + } + + nsFrameList childList; + + // Process children + nsFrameConstructorSaveState absoluteSaveState; + const nsStyleDisplay* display = outerComputedStyle->StyleDisplay(); + + // Mark the table frame as an absolute container if needed + newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (display->IsAbsPosContainingBlock(newFrame)) { + aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState); + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(innerFrame, floatSaveState); + + if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { + ConstructFramesFromItemList( + aState, aItem.mChildItems, innerFrame, + aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList); + } else { + ProcessChildren(aState, content, computedStyle, innerFrame, true, childList, + false); + } + + nsFrameList captionList; + PullOutCaptionFrames(childList, captionList); + + // Set the inner table frame's initial primary list + innerFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + + // Set the table wrapper frame's secondary childlist lists + if (captionList.NotEmpty()) { + captionList.ApplySetParent(newFrame); + newFrame->SetInitialChildList(FrameChildListID::Caption, + std::move(captionList)); + } + + return newFrame; +} + +static void MakeTablePartAbsoluteContainingBlockIfNeeded( + nsFrameConstructorState& aState, const nsStyleDisplay* aDisplay, + nsFrameConstructorSaveState& aAbsSaveState, nsContainerFrame* aFrame) { + // If we're positioned, then we need to become an absolute containing block + // for any absolutely positioned children and register for post-reflow fixup. + // + // Note that usually if a frame type can be an absolute containing block, we + // always set NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN, whether it actually is or + // not. However, in this case flag serves the additional purpose of indicating + // that the frame was registered with its table frame. This allows us to avoid + // the overhead of unregistering the frame in most cases. + if (aDisplay->IsAbsPosContainingBlock(aFrame)) { + aFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + aState.PushAbsoluteContainingBlock(aFrame, aFrame, aAbsSaveState); + nsTableFrame::RegisterPositionedTablePart(aFrame); + } +} + +nsIFrame* nsCSSFrameConstructor::ConstructTableRowOrRowGroup( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::TableRow || + aDisplay->mDisplay == StyleDisplay::TableRowGroup || + aDisplay->mDisplay == StyleDisplay::TableFooterGroup || + aDisplay->mDisplay == StyleDisplay::TableHeaderGroup, + "Not a row or row group"); + MOZ_ASSERT(aItem.mComputedStyle->StyleDisplay() == aDisplay, + "Display style doesn't match style"); + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsContainerFrame* newFrame; + if (aDisplay->mDisplay == StyleDisplay::TableRow) { + if (content->IsMathMLElement()) + newFrame = NS_NewMathMLmtrFrame(mPresShell, computedStyle); + else + newFrame = NS_NewTableRowFrame(mPresShell, computedStyle); + } else { + newFrame = NS_NewTableRowGroupFrame(mPresShell, computedStyle); + } + + InitAndRestoreFrame(aState, content, aParentFrame, newFrame); + + nsFrameConstructorSaveState absoluteSaveState; + MakeTablePartAbsoluteContainingBlockIfNeeded(aState, aDisplay, + absoluteSaveState, newFrame); + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(newFrame, floatSaveState); + + nsFrameList childList; + if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { + ConstructFramesFromItemList( + aState, aItem.mChildItems, newFrame, + aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList); + } else { + ProcessChildren(aState, content, computedStyle, newFrame, true, childList, + false); + } + + newFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + aFrameList.AppendFrame(nullptr, newFrame); + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructTableCol( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, + nsFrameList& aFrameList) { + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsTableColFrame* colFrame = NS_NewTableColFrame(mPresShell, computedStyle); + InitAndRestoreFrame(aState, content, aParentFrame, colFrame); + + NS_ASSERTION(colFrame->Style() == computedStyle, "Unexpected style"); + + aFrameList.AppendFrame(nullptr, colFrame); + + // construct additional col frames if the col frame has a span > 1 + int32_t span = colFrame->GetSpan(); + for (int32_t spanX = 1; spanX < span; spanX++) { + nsTableColFrame* newCol = NS_NewTableColFrame(mPresShell, computedStyle); + InitAndRestoreFrame(aState, content, aParentFrame, newCol, false); + aFrameList.LastChild()->SetNextContinuation(newCol); + newCol->SetPrevContinuation(aFrameList.LastChild()); + aFrameList.AppendFrame(nullptr, newCol); + newCol->SetColType(eColAnonymousCol); + } + + return colFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructTableCell( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + MOZ_ASSERT(aDisplay->mDisplay == StyleDisplay::TableCell, "Unexpected call"); + + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + const bool isMathMLContent = content->IsMathMLElement(); + + nsTableFrame* tableFrame = + static_cast<nsTableRowFrame*>(aParentFrame)->GetTableFrame(); + nsContainerFrame* newFrame; + // <mtable> is border separate in mathml.css and the MathML code doesn't + // implement border collapse. For those users who style <mtable> with border + // collapse, give them the default non-MathML table frames that understand + // border collapse. This won't break us because MathML table frames are all + // subclasses of the default table code, and so we can freely mix <mtable> + // with <mtr> or <tr>, <mtd> or <td>. What will happen is just that non-MathML + // frames won't understand MathML attributes and will therefore miss the + // special handling that the MathML code does. + if (isMathMLContent && !tableFrame->IsBorderCollapse()) { + newFrame = NS_NewMathMLmtdFrame(mPresShell, computedStyle, tableFrame); + } else { + // Warning: If you change this and add a wrapper frame around table cell + // frames, make sure Bug 368554 doesn't regress! + // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp. + newFrame = NS_NewTableCellFrame(mPresShell, computedStyle, tableFrame); + } + + // Initialize the table cell frame + InitAndRestoreFrame(aState, content, aParentFrame, newFrame); + newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Resolve pseudo style and initialize the body cell frame + RefPtr<ComputedStyle> innerPseudoStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::cellContent, computedStyle); + + // Create a block frame that will format the cell's content + nsContainerFrame* cellInnerFrame; + if (isMathMLContent) { + cellInnerFrame = NS_NewMathMLmtdInnerFrame(mPresShell, innerPseudoStyle); + } else { + cellInnerFrame = NS_NewBlockFormattingContext(mPresShell, innerPseudoStyle); + } + + InitAndRestoreFrame(aState, content, newFrame, cellInnerFrame); + + nsFrameConstructorSaveState absoluteSaveState; + MakeTablePartAbsoluteContainingBlockIfNeeded(aState, aDisplay, + absoluteSaveState, newFrame); + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(cellInnerFrame, floatSaveState); + + nsFrameList childList; + if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { + AutoFrameConstructionPageName pageNameTracker(aState, cellInnerFrame); + ConstructFramesFromItemList( + aState, aItem.mChildItems, cellInnerFrame, + aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList); + } else { + // Process the child content + ProcessChildren(aState, content, computedStyle, cellInnerFrame, true, + childList, !isMathMLContent); + } + + cellInnerFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + SetInitialSingleChild(newFrame, cellInnerFrame); + aFrameList.AppendFrame(nullptr, newFrame); + return newFrame; +} + +static inline bool NeedFrameFor(const nsFrameConstructorState& aState, + nsContainerFrame* aParentFrame, + nsIContent* aChildContent) { + // XXX the GetContent() != aChildContent check is needed due to bug 135040. + // Remove it once that's fixed. + MOZ_ASSERT( + !aChildContent->GetPrimaryFrame() || aState.mCreatingExtraFrames || + aChildContent->GetPrimaryFrame()->GetContent() != aChildContent, + "Why did we get called?"); + + // don't create a whitespace frame if aParentFrame doesn't want it. + // always create frames for children in generated content. counter(), + // quotes, and attr() content can easily change dynamically and we don't + // want to be reconstructing frames. It's not even clear that these + // should be considered ignorable just because they evaluate to + // whitespace. + + // We could handle all this in CreateNeededPseudoContainers or some other + // place after we build our frame construction items, but that would involve + // creating frame construction items for whitespace kids that ignores + // white-space, where we know we'll be dropping them all anyway, and involve + // an extra walk down the frame construction item list. + auto excludesIgnorableWhitespace = [](nsIFrame* aParentFrame) { + return aParentFrame->IsFrameOfType(nsIFrame::eXULBox) || + aParentFrame->IsFrameOfType(nsIFrame::eMathML); + }; + if (!aParentFrame || !excludesIgnorableWhitespace(aParentFrame) || + aParentFrame->IsGeneratedContentFrame() || !aChildContent->IsText()) { + return true; + } + + aChildContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE | + NS_REFRAME_IF_WHITESPACE); + return !aChildContent->TextIsOnlyWhitespace(); +} + +/*********************************************** + * END TABLE SECTION + ***********************************************/ + +void nsCSSFrameConstructor::SetRootElementFrameAndConstructCanvasAnonContent( + nsContainerFrame* aRootElementFrame, nsFrameConstructorState& aState, + nsFrameList& aFrameList) { + MOZ_DIAGNOSTIC_ASSERT(!mRootElementFrame); + mRootElementFrame = aRootElementFrame; + if (mDocElementContainingBlock->IsCanvasFrame()) { + // NOTE(emilio): This is in the reverse order compared to normal anonymous + // children. We usually generate anonymous kids first, then non-anonymous, + // but we generate the doc element frame the other way around. This is fine + // either way, but generating anonymous children in a different order + // requires changing nsCanvasFrame (and a whole lot of other potentially + // unknown code) to look at the last child to find the root frame rather + // than the first child. + ConstructAnonymousContentForCanvas(aState, mDocElementContainingBlock, + aRootElementFrame->GetContent(), + aFrameList); + } +} + +nsIFrame* nsCSSFrameConstructor::ConstructDocElementFrame( + Element* aDocElement) { + MOZ_ASSERT(GetRootFrame(), + "No viewport? Someone forgot to call ConstructRootFrame!"); + MOZ_ASSERT(!mDocElementContainingBlock, + "Shouldn't have a doc element containing block here"); + + // Resolve a new style for the viewport since it may be affected by a new root + // element style (e.g. a propagated 'direction'). + // + // @see ComputedStyle::ApplyStyleFixups + { + RefPtr<ComputedStyle> sc = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::viewport, nullptr); + GetRootFrame()->SetComputedStyleWithoutNotification(sc); + } + + // Ensure the document element is styled at this point. + if (!aDocElement->HasServoData()) { + mPresShell->StyleSet()->StyleNewSubtree(aDocElement); + } + + // Make sure to call UpdateViewportScrollStylesOverride before + // SetUpDocElementContainingBlock, since it sets up our scrollbar state + // properly. + DebugOnly<nsIContent*> propagatedScrollFrom; + if (nsPresContext* presContext = mPresShell->GetPresContext()) { + propagatedScrollFrom = presContext->UpdateViewportScrollStylesOverride(); + } + + SetUpDocElementContainingBlock(aDocElement); + + // This has the side-effect of getting `mFrameTreeState` from our docshell. + // + // FIXME(emilio): There may be a more sensible time to do this. + if (!mFrameTreeState) { + mPresShell->CaptureHistoryState(getter_AddRefs(mFrameTreeState)); + } + + NS_ASSERTION(mDocElementContainingBlock, "Should have parent by now"); + nsFrameConstructorState state( + mPresShell, + GetAbsoluteContainingBlock(mDocElementContainingBlock, FIXED_POS), + nullptr, nullptr, do_AddRef(mFrameTreeState)); + + RefPtr<ComputedStyle> computedStyle = + ServoStyleSet::ResolveServoStyle(*aDocElement); + + const nsStyleDisplay* display = computedStyle->StyleDisplay(); + + // --------- IF SCROLLABLE WRAP IN SCROLLFRAME -------- + + NS_ASSERTION(!display->IsScrollableOverflow() || + state.mPresContext->IsPaginated() || + propagatedScrollFrom == aDocElement, + "Scrollbars should have been propagated to the viewport"); + + if (MOZ_UNLIKELY(display->mDisplay == StyleDisplay::None)) { + return nullptr; + } + + if (mDocElementContainingBlock->IsCanvasFrame()) { + // This implements "The Principal Writing Mode". + // https://drafts.csswg.org/css-writing-modes-3/#principal-flow + // + // If there's a <body> element in an HTML document, its writing-mode, + // direction, and text-orientation override the root element's used value. + // + // We need to copy <body>'s WritingMode to mDocElementContainingBlock before + // construct mRootElementFrame so that anonymous internal frames such as + // <html> with table style can copy their parent frame's mWritingMode in + // nsIFrame::Init(). + MOZ_ASSERT(!mRootElementFrame, + "We need to copy <body>'s principal writing-mode before " + "constructing mRootElementFrame."); + + const WritingMode propagatedWM = [&] { + const WritingMode rootWM(computedStyle); + if (computedStyle->StyleDisplay()->IsContainAny()) { + return rootWM; + } + Element* body = mDocument->GetBodyElement(); + if (!body) { + return rootWM; + } + RefPtr<ComputedStyle> bodyStyle = ResolveComputedStyle(body); + if (bodyStyle->StyleDisplay()->IsContainAny()) { + return rootWM; + } + const WritingMode bodyWM(bodyStyle); + if (bodyWM != rootWM) { + nsContentUtils::ReportToConsole( + nsIScriptError::warningFlag, "Layout"_ns, mDocument, + nsContentUtils::eLAYOUT_PROPERTIES, + "PrincipalWritingModePropagationWarning"); + } + return bodyWM; + }(); + + mDocElementContainingBlock->PropagateWritingModeToSelfAndAncestors( + propagatedWM); + } + + nsFrameConstructorSaveState docElementContainingBlockAbsoluteSaveState; + // Push the absolute containing block now so we can absolutely position + // the root element + mDocElementContainingBlock->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + state.PushAbsoluteContainingBlock(mDocElementContainingBlock, + mDocElementContainingBlock, + docElementContainingBlockAbsoluteSaveState); + + // The rules from CSS 2.1, section 9.2.4, have already been applied + // by the style system, so we can assume that display->mDisplay is + // either NONE, BLOCK, or TABLE. + + // contentFrame is the primary frame for the root element. frameList contains + // the children of the initial containing block. + // + // The first of those frames is usually `contentFrame`, but it can be + // different, in particular if the root frame is positioned, in which case + // contentFrame is the out-of-flow frame and frameList.FirstChild() is the + // placeholder. + // + // The rest of the frames in frameList are the anonymous content of the canvas + // frame. + nsContainerFrame* contentFrame; + nsFrameList frameList; + bool processChildren = false; + + nsFrameConstructorSaveState absoluteSaveState; + + if (aDocElement->IsSVGElement()) { + if (!aDocElement->IsSVGElement(nsGkAtoms::svg)) { + return nullptr; + } + // We're going to call the right function ourselves, so no need to give a + // function to this FrameConstructionData. + + // XXXbz on the other hand, if we converted this whole function to + // FrameConstructionData/Item, then we'd need the right function + // here... but would probably be able to get away with less code in this + // function in general. + static constexpr FrameConstructionData rootSVGData; + AutoFrameConstructionItem item(this, &rootSVGData, aDocElement, + do_AddRef(computedStyle), true); + + contentFrame = static_cast<nsContainerFrame*>(ConstructOuterSVG( + state, item, mDocElementContainingBlock, display, frameList)); + } else if (display->mDisplay == StyleDisplay::Flex || + display->mDisplay == StyleDisplay::WebkitBox || + display->mDisplay == StyleDisplay::Grid || + display->mDisplay == StyleDisplay::MozBox) { + auto func = [&] { + if (display->mDisplay == StyleDisplay::Grid) { + return NS_NewGridContainerFrame; + } + if (display->mDisplay == StyleDisplay::MozBox && + !computedStyle->StyleVisibility()->EmulateMozBoxWithFlex()) { + return NS_NewBoxFrame; + } + return NS_NewFlexContainerFrame; + }(); + contentFrame = func(mPresShell, computedStyle); + InitAndRestoreFrame( + state, aDocElement, + state.GetGeometricParent(*display, mDocElementContainingBlock), + contentFrame); + state.AddChild(contentFrame, frameList, aDocElement, + mDocElementContainingBlock); + processChildren = true; + + contentFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (display->IsAbsPosContainingBlock(contentFrame)) { + state.PushAbsoluteContainingBlock(contentFrame, contentFrame, + absoluteSaveState); + } + } else if (display->mDisplay == StyleDisplay::Table) { + // We're going to call the right function ourselves, so no need to give a + // function to this FrameConstructionData. + + // XXXbz on the other hand, if we converted this whole function to + // FrameConstructionData/Item, then we'd need the right function + // here... but would probably be able to get away with less code in this + // function in general. + static constexpr FrameConstructionData rootTableData; + AutoFrameConstructionItem item(this, &rootTableData, aDocElement, + do_AddRef(computedStyle), true); + + // if the document is a table then just populate it. + contentFrame = static_cast<nsContainerFrame*>(ConstructTable( + state, item, mDocElementContainingBlock, display, frameList)); + } else if (display->DisplayInside() == StyleDisplayInside::Ruby) { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructBlockRubyFrame); + AutoFrameConstructionItem item(this, &data, aDocElement, + do_AddRef(computedStyle), true); + contentFrame = static_cast<nsContainerFrame*>(ConstructBlockRubyFrame( + state, item, + state.GetGeometricParent(*display, mDocElementContainingBlock), display, + frameList)); + } else { + MOZ_ASSERT(display->mDisplay == StyleDisplay::Block || + display->mDisplay == StyleDisplay::FlowRoot, + "Unhandled display type for root element"); + contentFrame = NS_NewBlockFormattingContext(mPresShell, computedStyle); + ConstructBlock( + state, aDocElement, + state.GetGeometricParent(*display, mDocElementContainingBlock), + mDocElementContainingBlock, computedStyle, &contentFrame, frameList, + display->IsAbsPosContainingBlock(contentFrame) ? contentFrame + : nullptr); + } + + MOZ_ASSERT(frameList.FirstChild()); + MOZ_ASSERT(frameList.FirstChild()->GetContent() == aDocElement); + MOZ_ASSERT(contentFrame); + + MOZ_ASSERT( + processChildren ? !mRootElementFrame : mRootElementFrame == contentFrame, + "unexpected mRootElementFrame"); + if (processChildren) { + SetRootElementFrameAndConstructCanvasAnonContent(contentFrame, state, + frameList); + } + + // Figure out which frame has the main style for the document element, + // assigning it to mRootElementStyleFrame. + // Backgrounds should be propagated from that frame to the viewport. + contentFrame->GetParentComputedStyle(&mRootElementStyleFrame); + bool isChild = mRootElementStyleFrame && + mRootElementStyleFrame->GetParent() == contentFrame; + if (!isChild) { + mRootElementStyleFrame = mRootElementFrame; + } + + if (processChildren) { + // Still need to process the child content + nsFrameList childList; + + NS_ASSERTION(!contentFrame->IsBlockFrameOrSubclass() && + !contentFrame->IsFrameOfType(nsIFrame::eSVG), + "Only XUL frames should reach here"); + + nsFrameConstructorSaveState floatSaveState; + state.MaybePushFloatContainingBlock(contentFrame, floatSaveState); + + ProcessChildren(state, aDocElement, computedStyle, contentFrame, true, + childList, false); + + // Set the initial child lists + contentFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + } + + nsIFrame* newFrame = frameList.FirstChild(); + // set the primary frame + aDocElement->SetPrimaryFrame(contentFrame); + mDocElementContainingBlock->AppendFrames(FrameChildListID::Principal, + std::move(frameList)); + + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructRootFrame() { + AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ConstructRootFrame", + LAYOUT_FrameConstruction); + AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); + + ServoStyleSet* styleSet = mPresShell->StyleSet(); + + // --------- BUILD VIEWPORT ----------- + RefPtr<ComputedStyle> viewportPseudoStyle = + styleSet->ResolveInheritingAnonymousBoxStyle(PseudoStyleType::viewport, + nullptr); + ViewportFrame* viewportFrame = + NS_NewViewportFrame(mPresShell, viewportPseudoStyle); + + // XXXbz do we _have_ to pass a null content pointer to that frame? + // Would it really kill us to pass in the root element or something? + // What would that break? + viewportFrame->Init(nullptr, nullptr, nullptr); + + viewportFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Bind the viewport frame to the root view + nsView* rootView = mPresShell->GetViewManager()->GetRootView(); + viewportFrame->SetView(rootView); + + viewportFrame->SyncFrameViewProperties(rootView); + nsContainerFrame::SyncWindowProperties(mPresShell->GetPresContext(), + viewportFrame, rootView, nullptr, + nsContainerFrame::SET_ASYNC); + + // Make it an absolute container for fixed-pos elements + viewportFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + viewportFrame->MarkAsAbsoluteContainingBlock(); + + return viewportFrame; +} + +void nsCSSFrameConstructor::SetUpDocElementContainingBlock( + nsIContent* aDocElement) { + MOZ_ASSERT(aDocElement, "No element?"); + MOZ_ASSERT(!aDocElement->GetParent(), "Not root content?"); + MOZ_ASSERT(aDocElement->GetUncomposedDoc(), "Not in a document?"); + MOZ_ASSERT(aDocElement->GetUncomposedDoc()->GetRootElement() == aDocElement, + "Not the root of the document?"); + + /* + how the root frame hierarchy should look + + Galley presentation, with scrolling: + + ViewportFrame [fixed-cb] + nsHTMLScrollFrame (if needed) + nsCanvasFrame [abs-cb] + root element frame (nsBlockFrame, SVGOuterSVGFrame, + nsTableWrapperFrame, nsPlaceholderFrame, + nsBoxFrame) + + Print presentation, non-XUL + + ViewportFrame + nsCanvasFrame + nsPageSequenceFrame + PrintedSheetFrame + nsPageFrame + nsPageContentFrame [fixed-cb] + nsCanvasFrame [abs-cb] + root element frame (nsBlockFrame, SVGOuterSVGFrame, + nsTableWrapperFrame, nsPlaceholderFrame) + + Print-preview presentation, non-XUL + + ViewportFrame + nsHTMLScrollFrame + nsCanvasFrame + nsPageSequenceFrame + PrintedSheetFrame + nsPageFrame + nsPageContentFrame [fixed-cb] + nsCanvasFrame [abs-cb] + root element frame (nsBlockFrame, SVGOuterSVGFrame, + nsTableWrapperFrame, + nsPlaceholderFrame) + + Print/print preview of XUL is not supported. + [fixed-cb]: the default containing block for fixed-pos content + [abs-cb]: the default containing block for abs-pos content + + Meaning of nsCSSFrameConstructor fields: + mRootElementFrame is "root element frame". This is the primary frame for + the root element. + mDocElementContainingBlock is the parent of mRootElementFrame + (i.e. nsCanvasFrame) + mPageSequenceFrame is the nsPageSequenceFrame, or null if there isn't + one + */ + + // --------- CREATE ROOT FRAME ------- + + // Create the root frame. The document element's frame is a child of the + // root frame. + // + // The root frame serves two purposes: + // - reserves space for any margins needed for the document element's frame + // - renders the document element's background. This ensures the background + // covers the entire canvas as specified by the CSS2 spec + + nsPresContext* presContext = mPresShell->GetPresContext(); + const bool isPaginated = presContext->IsRootPaginatedDocument(); + + const bool isHTML = aDocElement->IsHTMLElement(); + const bool isXUL = !isHTML && aDocElement->IsXULElement(); + + const bool isScrollable = [&] { + if (isPaginated) { + return presContext->HasPaginatedScrolling(); + } + // Never create scrollbars for XUL documents or top level XHTML documents + // that disable scrolling. + if (isXUL) { + return false; + } + if (aDocElement->OwnerDoc()->IsDocumentURISchemeChrome() && + aDocElement->AsElement()->AttrValueIs( + kNameSpaceID_None, nsGkAtoms::scrolling, nsGkAtoms::_false, + eCaseMatters)) { + return false; + } + return true; + }(); + + nsContainerFrame* viewportFrame = + static_cast<nsContainerFrame*>(GetRootFrame()); + ComputedStyle* viewportPseudoStyle = viewportFrame->Style(); + + nsContainerFrame* rootFrame = + NS_NewCanvasFrame(mPresShell, viewportPseudoStyle); + PseudoStyleType rootPseudo = PseudoStyleType::canvas; + mDocElementContainingBlock = rootFrame; + + // --------- IF SCROLLABLE WRAP IN SCROLLFRAME -------- + + // If the device supports scrolling (e.g., in galley mode on the screen and + // for print-preview, but not when printing), then create a scroll frame that + // will act as the scrolling mechanism for the viewport. + // XXX Do we even need a viewport when printing to a printer? + + // We no longer need to do overflow propagation here. It's taken care of + // when we construct frames for the element whose overflow might be + // propagated + NS_ASSERTION(!isScrollable || !isXUL, + "XUL documents should never be scrollable - see above"); + + nsContainerFrame* newFrame = rootFrame; + RefPtr<ComputedStyle> rootPseudoStyle; + // we must create a state because if the scrollbars are GFX it needs the + // state to build the scrollbar frames. + nsFrameConstructorState state(mPresShell, nullptr, nullptr, nullptr); + + // Start off with the viewport as parent; we'll adjust it as needed. + nsContainerFrame* parentFrame = viewportFrame; + + ServoStyleSet* styleSet = mPresShell->StyleSet(); + // If paginated, make sure we don't put scrollbars in + if (!isScrollable) { + rootPseudoStyle = styleSet->ResolveInheritingAnonymousBoxStyle( + rootPseudo, viewportPseudoStyle); + } else { + rootPseudo = PseudoStyleType::scrolledCanvas; + + // Build the frame. We give it the content we are wrapping which is the + // document element, the root frame, the parent view port frame, and we + // should get back the new frame and the scrollable view if one was + // created. + + // resolve a context for the scrollframe + RefPtr<ComputedStyle> computedStyle = + styleSet->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::viewportScroll, viewportPseudoStyle); + + // Note that the viewport scrollframe is always built with + // overflow:auto style. This forces the scroll frame to create + // anonymous content for both scrollbars. This is necessary even + // if the HTML or BODY elements are overriding the viewport + // scroll style to 'hidden' --- dynamic style changes might put + // scrollbars back on the viewport and we don't want to have to + // reframe the viewport to create the scrollbar content. + newFrame = nullptr; + rootPseudoStyle = + BeginBuildingScrollFrame(state, aDocElement, computedStyle, + viewportFrame, rootPseudo, true, newFrame); + parentFrame = newFrame; + } + + rootFrame->SetComputedStyleWithoutNotification(rootPseudoStyle); + rootFrame->Init(aDocElement, parentFrame, nullptr); + + if (isScrollable) { + FinishBuildingScrollFrame(parentFrame, rootFrame); + } + + if (isPaginated) { + // Create a page sequence frame + { + RefPtr<ComputedStyle> pageSequenceStyle = + styleSet->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::pageSequence, viewportPseudoStyle); + mPageSequenceFrame = + NS_NewPageSequenceFrame(mPresShell, pageSequenceStyle); + mPageSequenceFrame->Init(aDocElement, rootFrame, nullptr); + SetInitialSingleChild(rootFrame, mPageSequenceFrame); + } + + // Create the first printed sheet frame, as the sole child (for now) of our + // page sequence frame (mPageSequenceFrame). + auto* printedSheetFrame = + ConstructPrintedSheetFrame(mPresShell, mPageSequenceFrame, nullptr); + SetInitialSingleChild(mPageSequenceFrame, printedSheetFrame); + + MOZ_ASSERT(!mNextPageContentFramePageName, + "Next page name should not have been set."); + + // Create the first page, as the sole child (for now) of the printed sheet + // frame that we just created. + nsContainerFrame* canvasFrame; + nsContainerFrame* pageFrame = + ConstructPageFrame(mPresShell, printedSheetFrame, nullptr, canvasFrame); + pageFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + SetInitialSingleChild(printedSheetFrame, pageFrame); + + // The eventual parent of the document element frame. + // XXX should this be set for every new page (in ConstructPageFrame)? + mDocElementContainingBlock = canvasFrame; + } + + if (viewportFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + SetInitialSingleChild(viewportFrame, newFrame); + } else { + viewportFrame->AppendFrames(FrameChildListID::Principal, + nsFrameList(newFrame, newFrame)); + } +} + +void nsCSSFrameConstructor::ConstructAnonymousContentForCanvas( + nsFrameConstructorState& aState, nsContainerFrame* aFrame, + nsIContent* aDocElement, nsFrameList& aFrameList) { + NS_ASSERTION(aFrame->IsCanvasFrame(), "aFrame should be canvas frame!"); + MOZ_ASSERT(mRootElementFrame->GetContent() == aDocElement); + + AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems; + GetAnonymousContent(aDocElement, aFrame, anonymousItems); + if (anonymousItems.IsEmpty()) { + return; + } + + AutoFrameConstructionItemList itemsToConstruct(this); + AutoFrameConstructionPageName pageNameTracker(aState, aFrame); + AddFCItemsForAnonymousContent(aState, aFrame, anonymousItems, + itemsToConstruct, pageNameTracker); + ConstructFramesFromItemList(aState, itemsToConstruct, aFrame, + /* aParentIsWrapperAnonBox = */ false, + aFrameList); +} + +PrintedSheetFrame* nsCSSFrameConstructor::ConstructPrintedSheetFrame( + PresShell* aPresShell, nsContainerFrame* aParentFrame, + nsIFrame* aPrevSheetFrame) { + RefPtr<ComputedStyle> printedSheetPseudoStyle = + aPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle( + PseudoStyleType::printedSheet); + + auto* printedSheetFrame = + NS_NewPrintedSheetFrame(aPresShell, printedSheetPseudoStyle); + + printedSheetFrame->Init(nullptr, aParentFrame, aPrevSheetFrame); + + return printedSheetFrame; +} + +nsContainerFrame* nsCSSFrameConstructor::ConstructPageFrame( + PresShell* aPresShell, nsContainerFrame* aParentFrame, + nsIFrame* aPrevPageFrame, nsContainerFrame*& aCanvasFrame) { + ServoStyleSet* styleSet = aPresShell->StyleSet(); + + RefPtr<ComputedStyle> pagePseudoStyle = + styleSet->ResolveNonInheritingAnonymousBoxStyle(PseudoStyleType::page); + + nsContainerFrame* pageFrame = NS_NewPageFrame(aPresShell, pagePseudoStyle); + + // Initialize the page frame and force it to have a view. This makes printing + // of the pages easier and faster. + pageFrame->Init(nullptr, aParentFrame, aPrevPageFrame); + + RefPtr<const nsAtom> pageName; + if (mNextPageContentFramePageName) { + pageName = mNextPageContentFramePageName.forget(); + } else if (aPrevPageFrame) { + pageName = aPrevPageFrame->ComputePageValue(); + MOZ_ASSERT(pageName, + "Page name from prev-in-flow should not have been null"); + } + RefPtr<ComputedStyle> pageContentPseudoStyle = + styleSet->ResolvePageContentStyle(pageName); + + nsContainerFrame* pageContentFrame = NS_NewPageContentFrame( + aPresShell, pageContentPseudoStyle, pageName.forget()); + + // Initialize the page content frame and force it to have a view. Also make it + // the containing block for fixed elements which are repeated on every page. + nsIFrame* prevPageContentFrame = nullptr; + if (aPrevPageFrame) { + prevPageContentFrame = aPrevPageFrame->PrincipalChildList().FirstChild(); + NS_ASSERTION(prevPageContentFrame, "missing page content frame"); + } + pageContentFrame->Init(nullptr, pageFrame, prevPageContentFrame); + if (!prevPageContentFrame) { + // The canvas is an inheriting anon box, so needs to be "owned" by the page + // content. + pageContentFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + } + SetInitialSingleChild(pageFrame, pageContentFrame); + // Make it an absolute container for fixed-pos elements + pageContentFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + pageContentFrame->MarkAsAbsoluteContainingBlock(); + + RefPtr<ComputedStyle> canvasPseudoStyle = + styleSet->ResolveInheritingAnonymousBoxStyle(PseudoStyleType::canvas, + pageContentPseudoStyle); + + aCanvasFrame = NS_NewCanvasFrame(aPresShell, canvasPseudoStyle); + + nsIFrame* prevCanvasFrame = nullptr; + if (prevPageContentFrame) { + prevCanvasFrame = prevPageContentFrame->PrincipalChildList().FirstChild(); + NS_ASSERTION(prevCanvasFrame, "missing canvas frame"); + } + aCanvasFrame->Init(nullptr, pageContentFrame, prevCanvasFrame); + SetInitialSingleChild(pageContentFrame, aCanvasFrame); + return pageFrame; +} + +/* static */ +nsIFrame* nsCSSFrameConstructor::CreatePlaceholderFrameFor( + PresShell* aPresShell, nsIContent* aContent, nsIFrame* aFrame, + nsContainerFrame* aParentFrame, nsIFrame* aPrevInFlow, + nsFrameState aTypeBit) { + RefPtr<ComputedStyle> placeholderStyle = + aPresShell->StyleSet()->ResolveStyleForPlaceholder(); + + // The placeholder frame gets a pseudo style. + nsPlaceholderFrame* placeholderFrame = + NS_NewPlaceholderFrame(aPresShell, placeholderStyle, aTypeBit); + + placeholderFrame->Init(aContent, aParentFrame, aPrevInFlow); + + // Associate the placeholder/out-of-flow with each other. + placeholderFrame->SetOutOfFlowFrame(aFrame); + aFrame->SetProperty(nsIFrame::PlaceholderFrameProperty(), placeholderFrame); + + aFrame->AddStateBits(NS_FRAME_OUT_OF_FLOW); + + return placeholderFrame; +} + +// Clears any lazy bits set in the range [aStartContent, aEndContent). If +// aEndContent is null, that means to clear bits in all siblings starting with +// aStartContent. aStartContent must not be null unless aEndContent is also +// null. We do this so that when new children are inserted under elements whose +// frame is a leaf the new children don't cause us to try to construct frames +// for the existing children again. +static inline void ClearLazyBits(nsIContent* aStartContent, + nsIContent* aEndContent) { + MOZ_ASSERT(aStartContent || !aEndContent, + "Must have start child if we have an end child"); + + for (nsIContent* cur = aStartContent; cur != aEndContent; + cur = cur->GetNextSibling()) { + cur->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME); + } +} + +nsIFrame* nsCSSFrameConstructor::ConstructSelectFrame( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, + nsFrameList& aFrameList) { + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + // Construct a frame-based listbox or combobox + dom::HTMLSelectElement* sel = dom::HTMLSelectElement::FromNode(content); + MOZ_ASSERT(sel); + if (sel->IsCombobox()) { + // Construct a frame-based combo box. + // The frame-based combo box is built out of three parts. A display area, a + // button and a dropdown list. The display area and button are created + // through anonymous content. The drop-down list's frame is created + // explicitly. The combobox frame shares its content with the drop-down + // list. + nsFrameState flags = NS_BLOCK_FLOAT_MGR; + nsComboboxControlFrame* comboboxFrame = + NS_NewComboboxControlFrame(mPresShell, computedStyle, flags); + + // Save the history state so we don't restore during construction + // since the complete tree is required before we restore. + nsILayoutHistoryState* historyState = aState.mFrameState; + aState.mFrameState = nullptr; + // Initialize the combobox frame + InitAndRestoreFrame(aState, content, + aState.GetGeometricParent(*aStyleDisplay, aParentFrame), + comboboxFrame); + + comboboxFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + aState.AddChild(comboboxFrame, aFrameList, content, aParentFrame); + + // Resolve pseudo element style for the dropdown list + RefPtr<ComputedStyle> listStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::dropDownList, computedStyle); + + // child frames of combobox frame + nsFrameList childList; + + // Create display and button frames from the combobox's anonymous content. + // The anonymous content is appended to existing anonymous content for this + // element (the scrollbars). + // + // nsComboboxControlFrame needs special frame creation behavior for its + // first piece of anonymous content, which means that we can't take the + // normal ProcessChildren path. + AutoTArray<nsIAnonymousContentCreator::ContentInfo, 2> newAnonymousItems; + DebugOnly<nsresult> rv = + GetAnonymousContent(content, comboboxFrame, newAnonymousItems); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + MOZ_ASSERT(!newAnonymousItems.IsEmpty()); + + // Manually create a frame for the special NAC. + MOZ_ASSERT(newAnonymousItems[0].mContent == + comboboxFrame->GetDisplayNode()); + newAnonymousItems.RemoveElementAt(0); + nsIFrame* customFrame = comboboxFrame->CreateFrameForDisplayNode(); + MOZ_ASSERT(customFrame); + childList.AppendFrame(nullptr, customFrame); + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(comboboxFrame, floatSaveState); + + // The other piece of NAC can take the normal path. + AutoFrameConstructionItemList fcItems(this); + AutoFrameConstructionPageName pageNameTracker(aState, comboboxFrame); + AddFCItemsForAnonymousContent(aState, comboboxFrame, newAnonymousItems, + fcItems, pageNameTracker); + ConstructFramesFromItemList(aState, fcItems, comboboxFrame, + /* aParentIsWrapperAnonBox = */ false, + childList); + + comboboxFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + + aState.mFrameState = historyState; + if (aState.mFrameState) { + // Restore frame state for the entire subtree of |comboboxFrame|. + RestoreFrameState(comboboxFrame, aState.mFrameState); + } + return comboboxFrame; + } + + // Listbox, not combobox + nsContainerFrame* listFrame = + NS_NewListControlFrame(mPresShell, computedStyle); + + nsContainerFrame* scrolledFrame = + NS_NewSelectsAreaFrame(mPresShell, computedStyle, NS_BLOCK_FLOAT_MGR); + + // ******* this code stolen from Initialze ScrollFrame ******** + // please adjust this code to use BuildScrollFrame. + + InitializeListboxSelect(aState, listFrame, scrolledFrame, content, + aParentFrame, computedStyle, aFrameList); + + return listFrame; +} + +void nsCSSFrameConstructor::InitializeListboxSelect( + nsFrameConstructorState& aState, nsContainerFrame* scrollFrame, + nsContainerFrame* scrolledFrame, nsIContent* aContent, + nsContainerFrame* aParentFrame, ComputedStyle* aComputedStyle, + nsFrameList& aFrameList) { + // Initialize it + nsContainerFrame* geometricParent = + aState.GetGeometricParent(*aComputedStyle->StyleDisplay(), aParentFrame); + + // We don't call InitAndRestoreFrame for scrollFrame because we can only + // restore the frame state after its parts have been created (in particular, + // the scrollable view). So we have to split Init and Restore. + + scrollFrame->Init(aContent, geometricParent, nullptr); + aState.AddChild(scrollFrame, aFrameList, aContent, aParentFrame); + BuildScrollFrame(aState, aContent, aComputedStyle, scrolledFrame, + geometricParent, scrollFrame); + if (aState.mFrameState) { + // Restore frame state for the scroll frame + RestoreFrameStateFor(scrollFrame, aState.mFrameState); + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(scrolledFrame, floatSaveState); + + // Process children + nsFrameList childList; + + ProcessChildren(aState, aContent, aComputedStyle, scrolledFrame, false, + childList, false); + + // Set the scrolled frame's initial child lists + scrolledFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); +} + +nsIFrame* nsCSSFrameConstructor::ConstructFieldSetFrame( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, + nsFrameList& aFrameList) { + AutoRestore<bool> savedHasRenderedLegend(aState.mHasRenderedLegend); + aState.mHasRenderedLegend = false; + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsContainerFrame* fieldsetFrame = + NS_NewFieldSetFrame(mPresShell, computedStyle); + + // Initialize it + InitAndRestoreFrame(aState, content, + aState.GetGeometricParent(*aStyleDisplay, aParentFrame), + fieldsetFrame); + + fieldsetFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Resolve style and initialize the frame + RefPtr<ComputedStyle> fieldsetContentStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::fieldsetContent, computedStyle); + + const nsStyleDisplay* fieldsetContentDisplay = + fieldsetContentStyle->StyleDisplay(); + bool isScrollable = fieldsetContentDisplay->IsScrollableOverflow(); + nsContainerFrame* scrollFrame = nullptr; + if (isScrollable) { + fieldsetContentStyle = BeginBuildingScrollFrame( + aState, content, fieldsetContentStyle, fieldsetFrame, + PseudoStyleType::scrolledContent, false, scrollFrame); + } + + // Create the inner ::-moz-fieldset-content frame. + nsContainerFrame* contentFrameTop; + nsContainerFrame* contentFrame; + auto parent = scrollFrame ? scrollFrame : fieldsetFrame; + MOZ_ASSERT(fieldsetContentDisplay->DisplayOutside() == + StyleDisplayOutside::Block); + switch (fieldsetContentDisplay->DisplayInside()) { + case StyleDisplayInside::Flex: + contentFrame = NS_NewFlexContainerFrame(mPresShell, fieldsetContentStyle); + InitAndRestoreFrame(aState, content, parent, contentFrame); + contentFrameTop = contentFrame; + break; + case StyleDisplayInside::Grid: + contentFrame = NS_NewGridContainerFrame(mPresShell, fieldsetContentStyle); + InitAndRestoreFrame(aState, content, parent, contentFrame); + contentFrameTop = contentFrame; + break; + default: { + MOZ_ASSERT(fieldsetContentDisplay->mDisplay == StyleDisplay::Block, + "bug in StyleAdjuster::adjust_for_fieldset_content?"); + + contentFrame = + NS_NewBlockFormattingContext(mPresShell, fieldsetContentStyle); + if (fieldsetContentStyle->StyleColumn()->IsColumnContainerStyle()) { + contentFrameTop = BeginBuildingColumns( + aState, content, parent, contentFrame, fieldsetContentStyle); + } else { + // No need to create column container. Initialize content frame. + InitAndRestoreFrame(aState, content, parent, contentFrame); + contentFrameTop = contentFrame; + } + + break; + } + } + + aState.AddChild(fieldsetFrame, aFrameList, content, aParentFrame); + + // Process children + nsFrameConstructorSaveState absoluteSaveState; + nsFrameList childList; + + contentFrameTop->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (fieldsetFrame->IsAbsPosContainingBlock()) { + aState.PushAbsoluteContainingBlock(contentFrameTop, fieldsetFrame, + absoluteSaveState); + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(contentFrame, floatSaveState); + + ProcessChildren(aState, content, computedStyle, contentFrame, true, childList, + true); + nsFrameList fieldsetKids; + fieldsetKids.AppendFrame(nullptr, + scrollFrame ? scrollFrame : contentFrameTop); + + if (!MayNeedToCreateColumnSpanSiblings(contentFrame, childList)) { + // Set the inner frame's initial child lists. + contentFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + } else { + // Extract any initial non-column-span kids, and put them in inner frame's + // child list. + nsFrameList initialNonColumnSpanKids = + childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + contentFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(initialNonColumnSpanKids)); + + if (childList.NotEmpty()) { + nsFrameList columnSpanSiblings = CreateColumnSpanSiblings( + aState, contentFrame, childList, + // Column content should never be a absolute/fixed positioned + // containing block. Pass nullptr as aPositionedFrame. + nullptr); + FinishBuildingColumns(aState, contentFrameTop, contentFrame, + columnSpanSiblings); + } + } + + if (isScrollable) { + FinishBuildingScrollFrame(scrollFrame, contentFrameTop); + } + + // We use AppendFrames here because the rendered legend will already + // be present in the principal child list if it exists. + fieldsetFrame->AppendFrames(FrameChildListID::NoReflowPrincipal, + std::move(fieldsetKids)); + + return fieldsetFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructDetails( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, + nsFrameList& aFrameList) { + if (!aStyleDisplay->IsScrollableOverflow()) { + return ConstructNonScrollableBlock(aState, aItem, aParentFrame, + aStyleDisplay, aFrameList); + } + + // Build a scroll frame if necessary. + return ConstructScrollableBlock(aState, aItem, aParentFrame, aStyleDisplay, + aFrameList); +} + +nsIFrame* nsCSSFrameConstructor::ConstructBlockRubyFrame( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aStyleDisplay, + nsFrameList& aFrameList) { + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsBlockFrame* blockFrame = NS_NewBlockFrame(mPresShell, computedStyle); + nsContainerFrame* newFrame = blockFrame; + nsContainerFrame* geometricParent = + aState.GetGeometricParent(*aStyleDisplay, aParentFrame); + AutoFrameConstructionPageName pageNameTracker(aState, blockFrame); + if ((aItem.mFCData->mBits & FCDATA_MAY_NEED_SCROLLFRAME) && + aStyleDisplay->IsScrollableOverflow()) { + nsContainerFrame* scrollframe = nullptr; + BuildScrollFrame(aState, content, computedStyle, blockFrame, + geometricParent, scrollframe); + newFrame = scrollframe; + } else { + InitAndRestoreFrame(aState, content, geometricParent, blockFrame); + } + + RefPtr<ComputedStyle> rubyStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::blockRubyContent, computedStyle); + nsContainerFrame* rubyFrame = NS_NewRubyFrame(mPresShell, rubyStyle); + InitAndRestoreFrame(aState, content, blockFrame, rubyFrame); + SetInitialSingleChild(blockFrame, rubyFrame); + blockFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + aState.AddChild(newFrame, aFrameList, content, aParentFrame); + + if (!mRootElementFrame) { + // The frame we're constructing will be the root element frame. + SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState, + aFrameList); + } + + nsFrameConstructorSaveState absoluteSaveState; + blockFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (aStyleDisplay->IsAbsPosContainingBlock(newFrame)) { + aState.PushAbsoluteContainingBlock(blockFrame, blockFrame, + absoluteSaveState); + } + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(blockFrame, floatSaveState); + + nsFrameList childList; + ProcessChildren(aState, content, rubyStyle, rubyFrame, true, childList, false, + nullptr); + rubyFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + + return newFrame; +} + +static nsIFrame* FindAncestorWithGeneratedContentPseudo(nsIFrame* aFrame) { + for (nsIFrame* f = aFrame->GetParent(); f; f = f->GetParent()) { + NS_ASSERTION(f->IsGeneratedContentFrame(), + "should not have exited generated content"); + auto pseudo = f->Style()->GetPseudoType(); + if (pseudo == PseudoStyleType::before || pseudo == PseudoStyleType::after || + pseudo == PseudoStyleType::marker) + return f; + } + return nullptr; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindTextData(const Text& aTextContent, + nsIFrame* aParentFrame) { + if (aParentFrame && IsFrameForSVG(aParentFrame)) { + nsIFrame* ancestorFrame = SVGUtils::GetFirstNonAAncestorFrame(aParentFrame); + if (!ancestorFrame || !SVGUtils::IsInSVGTextSubtree(ancestorFrame)) { + return nullptr; + } + + // FIXME(bug 1588477) Don't render stuff in display: contents / Shadow DOM + // subtrees, because TextCorrespondenceRecorder in the SVG text code doesn't + // really know how to deal with it. This kinda sucks. :( + if (aParentFrame->GetContent() != aTextContent.GetParent()) { + return nullptr; + } + + static constexpr FrameConstructionData sSVGTextData( + NS_NewTextFrame, FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_SVG_TEXT); + return &sSVGTextData; + } + + static constexpr FrameConstructionData sTextData(NS_NewTextFrame, + FCDATA_IS_LINE_PARTICIPANT); + return &sTextData; +} + +void nsCSSFrameConstructor::ConstructTextFrame( + const FrameConstructionData* aData, nsFrameConstructorState& aState, + nsIContent* aContent, nsContainerFrame* aParentFrame, + ComputedStyle* aComputedStyle, nsFrameList& aFrameList) { + MOZ_ASSERT(aData, "Must have frame construction data"); + + nsIFrame* newFrame = + (*aData->mFunc.mCreationFunc)(mPresShell, aComputedStyle); + + InitAndRestoreFrame(aState, aContent, aParentFrame, newFrame); + + // We never need to create a view for a text frame. + + if (newFrame->IsGeneratedContentFrame()) { + UniquePtr<nsGenConInitializer> initializer( + static_cast<nsGenConInitializer*>( + aContent->TakeProperty(nsGkAtoms::genConInitializerProperty))); + if (initializer) { + if (initializer->mNode.release()->InitTextFrame( + initializer->mList, + FindAncestorWithGeneratedContentPseudo(newFrame), newFrame)) { + (this->*(initializer->mDirtyAll))(); + } + } + } + + // Add the newly constructed frame to the flow + aFrameList.AppendFrame(nullptr, newFrame); + + if (!aState.mCreatingExtraFrames || (aContent->IsInNativeAnonymousSubtree() && + !aContent->GetPrimaryFrame())) { + aContent->SetPrimaryFrame(newFrame); + } +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindDataByInt(int32_t aInt, const Element& aElement, + ComputedStyle& aComputedStyle, + const FrameConstructionDataByInt* aDataPtr, + uint32_t aDataLength) { + for (const FrameConstructionDataByInt *curData = aDataPtr, + *endData = aDataPtr + aDataLength; + curData != endData; ++curData) { + if (curData->mInt == aInt) { + const FrameConstructionData* data = &curData->mData; + if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) { + return data->mFunc.mDataGetter(aElement, aComputedStyle); + } + + return data; + } + } + + return nullptr; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindDataByTag(const Element& aElement, + ComputedStyle& aStyle, + const FrameConstructionDataByTag* aDataPtr, + uint32_t aDataLength) { + const nsAtom* tag = aElement.NodeInfo()->NameAtom(); + for (const FrameConstructionDataByTag *curData = aDataPtr, + *endData = aDataPtr + aDataLength; + curData != endData; ++curData) { + if (curData->mTag == tag) { + const FrameConstructionData* data = &curData->mData; + if (data->mBits & FCDATA_FUNC_IS_DATA_GETTER) { + return data->mFunc.mDataGetter(aElement, aStyle); + } + + return data; + } + } + + return nullptr; +} + +#define SUPPRESS_FCDATA() FrameConstructionData(nullptr, FCDATA_SUPPRESS_FRAME) +#define SIMPLE_INT_CREATE(_int, _func) \ + { int32_t(_int), FrameConstructionData(_func) } +#define SIMPLE_INT_CHAIN(_int, _func) \ + { int32_t(_int), FrameConstructionData(_func) } +#define COMPLEX_INT_CREATE(_int, _func) \ + { int32_t(_int), FrameConstructionData(_func) } + +#define SIMPLE_TAG_CREATE(_tag, _func) \ + { nsGkAtoms::_tag, FrameConstructionData(_func) } +#define SIMPLE_TAG_CHAIN(_tag, _func) \ + { nsGkAtoms::_tag, FrameConstructionData(_func) } +#define COMPLEX_TAG_CREATE(_tag, _func) \ + { nsGkAtoms::_tag, FrameConstructionData(_func) } + +static nsFieldSetFrame* GetFieldSetFrameFor(nsIFrame* aFrame) { + auto pseudo = aFrame->Style()->GetPseudoType(); + if (pseudo == PseudoStyleType::fieldsetContent || + pseudo == PseudoStyleType::scrolledContent || + pseudo == PseudoStyleType::columnSet || + pseudo == PseudoStyleType::columnContent) { + return GetFieldSetFrameFor(aFrame->GetParent()); + } + return do_QueryFrame(aFrame); +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindHTMLData(const Element& aElement, + nsIFrame* aParentFrame, + ComputedStyle& aStyle) { + MOZ_ASSERT(aElement.IsHTMLElement()); + NS_ASSERTION(!aParentFrame || + aParentFrame->Style()->GetPseudoType() != + PseudoStyleType::fieldsetContent || + aParentFrame->GetParent()->IsFieldSetFrame(), + "Unexpected parent for fieldset content anon box"); + static constexpr FrameConstructionDataByTag sHTMLData[] = { + SIMPLE_TAG_CHAIN(img, nsCSSFrameConstructor::FindImgData), + SIMPLE_TAG_CHAIN(mozgeneratedcontentimage, + nsCSSFrameConstructor::FindGeneratedImageData), + {nsGkAtoms::br, + {NS_NewBRFrame, FCDATA_IS_LINE_PARTICIPANT | FCDATA_IS_LINE_BREAK}}, + SIMPLE_TAG_CREATE(wbr, NS_NewWBRFrame), + SIMPLE_TAG_CHAIN(input, nsCSSFrameConstructor::FindInputData), + SIMPLE_TAG_CREATE(textarea, NS_NewTextControlFrame), + COMPLEX_TAG_CREATE(select, &nsCSSFrameConstructor::ConstructSelectFrame), + SIMPLE_TAG_CHAIN(object, nsCSSFrameConstructor::FindObjectData), + SIMPLE_TAG_CHAIN(embed, nsCSSFrameConstructor::FindObjectData), + COMPLEX_TAG_CREATE(fieldset, + &nsCSSFrameConstructor::ConstructFieldSetFrame), + SIMPLE_TAG_CREATE(frameset, NS_NewHTMLFramesetFrame), + SIMPLE_TAG_CREATE(iframe, NS_NewSubDocumentFrame), + {nsGkAtoms::button, + {ToCreationFunc(NS_NewHTMLButtonControlFrame), + FCDATA_ALLOW_BLOCK_STYLES | FCDATA_ALLOW_GRID_FLEX_COLUMN, + PseudoStyleType::buttonContent}}, + SIMPLE_TAG_CHAIN(canvas, nsCSSFrameConstructor::FindCanvasData), + SIMPLE_TAG_CREATE(video, NS_NewHTMLVideoFrame), + SIMPLE_TAG_CREATE(audio, NS_NewHTMLVideoFrame), + SIMPLE_TAG_CREATE(progress, NS_NewProgressFrame), + SIMPLE_TAG_CREATE(meter, NS_NewMeterFrame), + COMPLEX_TAG_CREATE(details, &nsCSSFrameConstructor::ConstructDetails)}; + + return FindDataByTag(aElement, aStyle, sHTMLData, ArrayLength(sHTMLData)); +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindGeneratedImageData(const Element& aElement, + ComputedStyle&) { + if (!aElement.IsInNativeAnonymousSubtree()) { + return nullptr; + } + + auto& generatedContent = static_cast<const GeneratedImageContent&>(aElement); + if (generatedContent.IsForListStyleImageMarker()) { + static constexpr FrameConstructionData sImgData( + NS_NewImageFrameForListStyleImage); + return &sImgData; + } + + static constexpr FrameConstructionData sImgData( + NS_NewImageFrameForGeneratedContentIndex); + return &sImgData; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindImgData(const Element& aElement, + ComputedStyle& aStyle) { + if (nsImageFrame::ImageFrameTypeFor(aElement, aStyle) != + nsImageFrame::ImageFrameType::ForElementRequest) { + // content: url gets handled by the generic code-path. + return nullptr; + } + + static constexpr FrameConstructionData sImgData(NS_NewImageFrame); + return &sImgData; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindImgControlData(const Element& aElement, + ComputedStyle& aStyle) { + if (nsImageFrame::ImageFrameTypeFor(aElement, aStyle) != + nsImageFrame::ImageFrameType::ForElementRequest) { + return nullptr; + } + + static constexpr FrameConstructionData sImgControlData( + NS_NewImageControlFrame); + return &sImgControlData; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindSearchControlData(const Element& aElement, + ComputedStyle& aStyle) { + if (StaticPrefs::layout_forms_input_type_search_enabled()) { + static constexpr FrameConstructionData sSearchControlData( + NS_NewSearchControlFrame); + return &sSearchControlData; + } + + static constexpr FrameConstructionData sTextControlData( + NS_NewTextControlFrame); + return &sTextControlData; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindInputData(const Element& aElement, + ComputedStyle& aStyle) { + static constexpr FrameConstructionDataByInt sInputData[] = { + SIMPLE_INT_CREATE(FormControlType::InputCheckbox, + ToCreationFunc(NS_NewCheckboxRadioFrame)), + SIMPLE_INT_CREATE(FormControlType::InputRadio, + ToCreationFunc(NS_NewCheckboxRadioFrame)), + SIMPLE_INT_CREATE(FormControlType::InputFile, NS_NewFileControlFrame), + SIMPLE_INT_CHAIN(FormControlType::InputImage, + nsCSSFrameConstructor::FindImgControlData), + SIMPLE_INT_CREATE(FormControlType::InputEmail, NS_NewTextControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputText, NS_NewTextControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputTel, NS_NewTextControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputUrl, NS_NewTextControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputRange, NS_NewRangeFrame), + SIMPLE_INT_CREATE(FormControlType::InputPassword, NS_NewTextControlFrame), + {int32_t(FormControlType::InputColor), + {NS_NewColorControlFrame, 0, PseudoStyleType::buttonContent}}, + + SIMPLE_INT_CHAIN(FormControlType::InputSearch, + nsCSSFrameConstructor::FindSearchControlData), + SIMPLE_INT_CREATE(FormControlType::InputNumber, NS_NewNumberControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputTime, NS_NewDateTimeControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputDate, NS_NewDateTimeControlFrame), + SIMPLE_INT_CREATE(FormControlType::InputDatetimeLocal, + NS_NewDateTimeControlFrame), + // TODO: this is temporary until a frame is written: bug 888320 + SIMPLE_INT_CREATE(FormControlType::InputMonth, NS_NewTextControlFrame), + // TODO: this is temporary until a frame is written: bug 888320 + SIMPLE_INT_CREATE(FormControlType::InputWeek, NS_NewTextControlFrame), + {int32_t(FormControlType::InputSubmit), + {ToCreationFunc(NS_NewGfxButtonControlFrame), 0, + PseudoStyleType::buttonContent}}, + {int32_t(FormControlType::InputReset), + {ToCreationFunc(NS_NewGfxButtonControlFrame), 0, + PseudoStyleType::buttonContent}}, + {int32_t(FormControlType::InputButton), + {ToCreationFunc(NS_NewGfxButtonControlFrame), 0, + PseudoStyleType::buttonContent}} + // Keeping hidden inputs out of here on purpose for so they get frames by + // display (in practice, none). + }; + + auto controlType = HTMLInputElement::FromNode(aElement)->ControlType(); + + // radio and checkbox inputs with appearance:none should be constructed + // by display type. (Note that we're not checking that appearance is + // not (respectively) StyleAppearance::Radio and StyleAppearance::Checkbox.) + if ((controlType == FormControlType::InputCheckbox || + controlType == FormControlType::InputRadio) && + !aStyle.StyleDisplay()->HasAppearance()) { + return nullptr; + } + + return FindDataByInt(int32_t(controlType), aElement, aStyle, sInputData, + ArrayLength(sInputData)); +} + +static nsIFrame* NS_NewSubDocumentOrImageFrame(mozilla::PresShell* aPresShell, + mozilla::ComputedStyle* aStyle) { + return StaticPrefs:: + browser_opaqueResponseBlocking_syntheticBrowsingContext_AtStartup() + ? NS_NewSubDocumentFrame(aPresShell, aStyle) + : NS_NewImageFrame(aPresShell, aStyle); +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindObjectData(const Element& aElement, + ComputedStyle& aStyle) { + // GetDisplayedType isn't necessarily nsIObjectLoadingContent::TYPE_NULL for + // cases when the object is broken/suppressed/etc (e.g. a broken image), but + // we want to treat those cases as TYPE_NULL + uint32_t type; + if (aElement.State().HasState(ElementState::BROKEN)) { + type = nsIObjectLoadingContent::TYPE_NULL; + } else { + nsCOMPtr<nsIObjectLoadingContent> objContent = + do_QueryInterface(const_cast<Element*>(&aElement)); + NS_ASSERTION(objContent, + "embed and object must implement " + "nsIObjectLoadingContent!"); + + objContent->GetDisplayedType(&type); + } + + if (type == nsIObjectLoadingContent::TYPE_FALLBACK && + !StaticPrefs::layout_use_plugin_fallback()) { + type = nsIObjectLoadingContent::TYPE_NULL; + } + + static constexpr FrameConstructionDataByInt sObjectData[] = { + SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_LOADING, + NS_NewEmptyFrame), + SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_FALLBACK, + ToCreationFunc(NS_NewBlockFrame)), + SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_IMAGE, + NS_NewSubDocumentOrImageFrame), + SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_DOCUMENT, + NS_NewSubDocumentFrame), + // Fake plugin handlers load as documents + // XXXmats is TYPE_FAKE_PLUGIN something we need? + SIMPLE_INT_CREATE(nsIObjectLoadingContent::TYPE_FAKE_PLUGIN, + NS_NewSubDocumentFrame) + // Nothing for TYPE_NULL so we'll construct frames by display there + }; + + return FindDataByInt((int32_t)type, aElement, aStyle, sObjectData, + ArrayLength(sObjectData)); +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindCanvasData(const Element& aElement, + ComputedStyle& aStyle) { + // We want to check whether script is enabled on the document that + // could be painting to the canvas. That's the owner document of + // the canvas, except when the owner document is a static document, + // in which case it's the original document it was cloned from. + Document* doc = aElement.OwnerDoc(); + if (doc->IsStaticDocument()) { + doc = doc->GetOriginalDocument(); + } + if (!doc->IsScriptEnabled()) { + return nullptr; + } + + static constexpr FrameConstructionData sCanvasData( + NS_NewHTMLCanvasFrame, 0, PseudoStyleType::htmlCanvasContent); + return &sCanvasData; +} + +void nsCSSFrameConstructor::ConstructFrameFromItemInternal( + FrameConstructionItem& aItem, nsFrameConstructorState& aState, + nsContainerFrame* aParentFrame, nsFrameList& aFrameList) { + const FrameConstructionData* data = aItem.mFCData; + NS_ASSERTION(data, "Must have frame construction data"); + + uint32_t bits = data->mBits; + + NS_ASSERTION(!(bits & FCDATA_FUNC_IS_DATA_GETTER), + "Should have dealt with this inside the data finder"); + + // Some sets of bits are not compatible with each other +#define CHECK_ONLY_ONE_BIT(_bit1, _bit2) \ + NS_ASSERTION(!(bits & _bit1) || !(bits & _bit2), \ + "Only one of these bits should be set") + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, + FCDATA_FORCE_NULL_ABSPOS_CONTAINER); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_WRAP_KIDS_IN_BLOCKS); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_IS_POPUP); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_SKIP_ABSPOS_PUSH); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, + FCDATA_DISALLOW_GENERATED_CONTENT); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, FCDATA_ALLOW_BLOCK_STYLES); + CHECK_ONLY_ONE_BIT(FCDATA_FUNC_IS_FULL_CTOR, + FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS); + CHECK_ONLY_ONE_BIT(FCDATA_WRAP_KIDS_IN_BLOCKS, + FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS); +#undef CHECK_ONLY_ONE_BIT + NS_ASSERTION(!(bits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) || + ((bits & FCDATA_FUNC_IS_FULL_CTOR) && + data->mFunc.mFullConstructor == + &nsCSSFrameConstructor::ConstructNonScrollableBlock), + "Unexpected FCDATA_FORCED_NON_SCROLLABLE_BLOCK flag"); + MOZ_ASSERT( + !(bits & FCDATA_IS_WRAPPER_ANON_BOX) || (bits & FCDATA_USE_CHILD_ITEMS), + "Wrapper anon boxes should always have FCDATA_USE_CHILD_ITEMS"); + MOZ_ASSERT(!(bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) || + (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS), + "Need the block wrapper bit to create grid/flex/column."); + + // Don't create a subdocument frame for iframes if we're creating extra frames + if (aState.mCreatingExtraFrames && + aItem.mContent->IsHTMLElement(nsGkAtoms::iframe)) { + return; + } + + nsIContent* const content = aItem.mContent; + nsIFrame* newFrame; + nsIFrame* primaryFrame; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + const nsStyleDisplay* display = computedStyle->StyleDisplay(); + if (bits & FCDATA_FUNC_IS_FULL_CTOR) { + newFrame = (this->*(data->mFunc.mFullConstructor))( + aState, aItem, aParentFrame, display, aFrameList); + MOZ_ASSERT(newFrame, "Full constructor failed"); + primaryFrame = newFrame; + } else { + newFrame = (*data->mFunc.mCreationFunc)(mPresShell, computedStyle); + + const bool allowOutOfFlow = !(bits & FCDATA_DISALLOW_OUT_OF_FLOW); + const bool isPopup = aItem.mIsPopup; + + nsContainerFrame* geometricParent = + (isPopup || allowOutOfFlow) + ? aState.GetGeometricParent(*display, aParentFrame) + : aParentFrame; + + // In the non-scrollframe case, primaryFrame and newFrame are equal; in the + // scrollframe case, newFrame is the scrolled frame while primaryFrame is + // the scrollframe. + if ((bits & FCDATA_MAY_NEED_SCROLLFRAME) && + display->IsScrollableOverflow()) { + nsContainerFrame* scrollframe = nullptr; + BuildScrollFrame(aState, content, computedStyle, newFrame, + geometricParent, scrollframe); + primaryFrame = scrollframe; + } else { + InitAndRestoreFrame(aState, content, geometricParent, newFrame); + primaryFrame = newFrame; + } + + // If we need to create a block formatting context to wrap our + // kids, do it now. + nsIFrame* maybeAbsoluteContainingBlockStyleFrame = primaryFrame; + nsIFrame* maybeAbsoluteContainingBlock = newFrame; + nsIFrame* possiblyLeafFrame = newFrame; + nsContainerFrame* outerFrame = nullptr; + if (bits & FCDATA_CREATE_BLOCK_WRAPPER_FOR_ALL_KIDS) { + RefPtr<ComputedStyle> outerStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + data->mAnonBoxPseudo, computedStyle); +#ifdef DEBUG + nsContainerFrame* containerFrame = do_QueryFrame(newFrame); + MOZ_ASSERT(containerFrame); +#endif + nsContainerFrame* container = static_cast<nsContainerFrame*>(newFrame); + nsContainerFrame* innerFrame; + if (bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) { + switch (display->DisplayInside()) { + case StyleDisplayInside::Flex: + outerFrame = NS_NewFlexContainerFrame(mPresShell, outerStyle); + InitAndRestoreFrame(aState, content, container, outerFrame); + innerFrame = outerFrame; + break; + case StyleDisplayInside::Grid: + outerFrame = NS_NewGridContainerFrame(mPresShell, outerStyle); + InitAndRestoreFrame(aState, content, container, outerFrame); + innerFrame = outerFrame; + break; + default: { + innerFrame = NS_NewBlockFormattingContext(mPresShell, outerStyle); + if (outerStyle->StyleColumn()->IsColumnContainerStyle()) { + outerFrame = BeginBuildingColumns(aState, content, container, + innerFrame, outerStyle); + } else { + // No need to create column container. Initialize innerFrame. + InitAndRestoreFrame(aState, content, container, innerFrame); + outerFrame = innerFrame; + } + break; + } + } + } else { + innerFrame = NS_NewBlockFormattingContext(mPresShell, outerStyle); + InitAndRestoreFrame(aState, content, container, innerFrame); + outerFrame = innerFrame; + } + + SetInitialSingleChild(container, outerFrame); + + container->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Now figure out whether newFrame or outerFrame should be the + // absolute container. + auto outerDisplay = outerStyle->StyleDisplay(); + if (outerDisplay->IsAbsPosContainingBlock(outerFrame)) { + maybeAbsoluteContainingBlock = outerFrame; + maybeAbsoluteContainingBlockStyleFrame = outerFrame; + innerFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + } + + // Our kids should go into the innerFrame. + newFrame = innerFrame; + } + + aState.AddChild(primaryFrame, aFrameList, content, aParentFrame, + allowOutOfFlow, allowOutOfFlow); + + nsContainerFrame* newFrameAsContainer = do_QueryFrame(newFrame); + if (newFrameAsContainer) { + // Process the child content if requested + nsFrameList childList; + nsFrameConstructorSaveState absoluteSaveState; + + if (bits & FCDATA_FORCE_NULL_ABSPOS_CONTAINER) { + aState.PushAbsoluteContainingBlock(nullptr, nullptr, absoluteSaveState); + } else if (!(bits & FCDATA_SKIP_ABSPOS_PUSH)) { + maybeAbsoluteContainingBlock->AddStateBits( + NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (maybeAbsoluteContainingBlockStyleFrame->IsAbsPosContainingBlock()) { + auto* cf = + static_cast<nsContainerFrame*>(maybeAbsoluteContainingBlock); + aState.PushAbsoluteContainingBlock( + cf, maybeAbsoluteContainingBlockStyleFrame, absoluteSaveState); + } + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(newFrameAsContainer, floatSaveState); + + if (bits & FCDATA_USE_CHILD_ITEMS) { + // At this point, we have not set up the auto value for this frame, and + // no caller will have set it so it is not redundant and therefor will + // not assert. + AutoFrameConstructionPageName pageNameTracker(aState, + newFrameAsContainer); + ConstructFramesFromItemList( + aState, aItem.mChildItems, newFrameAsContainer, + bits & FCDATA_IS_WRAPPER_ANON_BOX, childList); + } else { + // Process the child frames. + ProcessChildren(aState, content, computedStyle, newFrameAsContainer, + !(bits & FCDATA_DISALLOW_GENERATED_CONTENT), childList, + (bits & FCDATA_ALLOW_BLOCK_STYLES) != 0, + possiblyLeafFrame); + } + + if (bits & FCDATA_WRAP_KIDS_IN_BLOCKS) { + nsFrameList newList; + nsFrameList currentBlockList; + nsIFrame* f; + while ((f = childList.FirstChild()) != nullptr) { + bool wrapFrame = IsInlineFrame(f) || IsFramePartOfIBSplit(f); + if (!wrapFrame) { + FlushAccumulatedBlock(aState, content, newFrameAsContainer, + currentBlockList, newList); + } + + childList.RemoveFrame(f); + if (wrapFrame) { + currentBlockList.AppendFrame(nullptr, f); + } else { + newList.AppendFrame(nullptr, f); + } + } + FlushAccumulatedBlock(aState, content, newFrameAsContainer, + currentBlockList, newList); + + if (childList.NotEmpty()) { + // an error must have occurred, delete unprocessed frames + childList.DestroyFrames(); + } + + childList = std::move(newList); + } + + if (!(bits & FCDATA_ALLOW_GRID_FLEX_COLUMN) || + !MayNeedToCreateColumnSpanSiblings(newFrameAsContainer, childList)) { + // Set the frame's initial child list. Note that MathML depends on this + // being called even if childList is empty! + newFrameAsContainer->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + } else { + // Extract any initial non-column-span kids, and put them in inner + // frame's child list. + nsFrameList initialNonColumnSpanKids = + childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + newFrameAsContainer->SetInitialChildList( + FrameChildListID::Principal, std::move(initialNonColumnSpanKids)); + + if (childList.NotEmpty()) { + nsFrameList columnSpanSiblings = CreateColumnSpanSiblings( + aState, newFrameAsContainer, childList, + // Column content should never be a absolute/fixed positioned + // containing block. Pass nullptr as aPositionedFrame. + nullptr); + + MOZ_ASSERT(outerFrame, + "outerFrame should be non-null if multi-column container " + "is created."); + FinishBuildingColumns(aState, outerFrame, newFrameAsContainer, + columnSpanSiblings); + } + } + } + } + + NS_ASSERTION(newFrame->IsFrameOfType(nsIFrame::eLineParticipant) == + ((bits & FCDATA_IS_LINE_PARTICIPANT) != 0), + "Incorrectly set FCDATA_IS_LINE_PARTICIPANT bits"); + + // Even if mCreatingExtraFrames is set, we may need to SetPrimaryFrame for + // generated content that doesn't have one yet. Note that we have to examine + // the frame bit, because by this point mIsGeneratedContent has been cleared + // on aItem. + if ((!aState.mCreatingExtraFrames || + (aItem.mContent->IsRootOfNativeAnonymousSubtree() && + !aItem.mContent->GetPrimaryFrame())) && + !(bits & FCDATA_SKIP_FRAMESET)) { + aItem.mContent->SetPrimaryFrame(primaryFrame); + ActiveLayerTracker::TransferActivityToFrame(aItem.mContent, primaryFrame); + } +} + +static void GatherSubtreeElements(Element* aElement, + nsTArray<Element*>& aElements) { + aElements.AppendElement(aElement); + StyleChildrenIterator iter(aElement); + for (nsIContent* c = iter.GetNextChild(); c; c = iter.GetNextChild()) { + if (!c->IsElement()) { + continue; + } + GatherSubtreeElements(c->AsElement(), aElements); + } +} + +nsresult nsCSSFrameConstructor::GetAnonymousContent( + nsIContent* aParent, nsIFrame* aParentFrame, + nsTArray<nsIAnonymousContentCreator::ContentInfo>& aContent) { + nsIAnonymousContentCreator* creator = do_QueryFrame(aParentFrame); + if (!creator) { + return NS_OK; + } + + nsresult rv = creator->CreateAnonymousContent(aContent); + if (NS_FAILED(rv)) { + // CreateAnonymousContent failed, e.g. because the page has a <use> loop. + return rv; + } + + MOZ_ASSERT(aParent->IsElement()); + for (const auto& info : aContent) { + // get our child's content and set its parent to our content + nsIContent* content = info.mContent; + content->SetIsNativeAnonymousRoot(); + + BindContext context(*aParent->AsElement(), BindContext::ForNativeAnonymous); + rv = content->BindToTree(context, *aParent); + + if (NS_FAILED(rv)) { + content->UnbindFromTree(); + return rv; + } + } + + // Some situations where we don't cache anonymous content styles: + // + // * when visibility or pointer-events is anything other than the initial + // value; we rely on visibility and pointer-events inheriting into anonymous + // content, but don't bother adding this state to the AnonymousContentKey, + // since it's not so common. Note that with overlay scrollbars, scrollbars + // always start off with pointer-events: none so we don't need to check for + // that in that case. + // + // * when the medium is anything other than screen; some UA style sheet rules + // apply in e.g. print medium, and will give different results from the + // cached styles + Maybe<bool> computedAllowStyleCaching; + auto ComputeAllowStyleCaching = [&] { + if (!StaticPrefs::layout_css_cached_scrollbar_styles_enabled()) { + return false; + } + if (aParentFrame->StyleVisibility()->mVisible != StyleVisibility::Visible) { + return false; + } + nsPresContext* pc = mPresShell->GetPresContext(); + if (!pc->UseOverlayScrollbars() && + aParentFrame->StyleUI()->ComputedPointerEvents() != + StylePointerEvents::Auto) { + return false; + } + if (pc->Medium() != nsGkAtoms::screen) { + return false; + } + return true; + }; + + auto AllowStyleCaching = [&] { + if (computedAllowStyleCaching.isNothing()) { + computedAllowStyleCaching.emplace(ComputeAllowStyleCaching()); + } + return computedAllowStyleCaching.value(); + }; + + // Compute styles for the anonymous content tree. + ServoStyleSet* styleSet = mPresShell->StyleSet(); + for (auto& info : aContent) { + Element* e = Element::FromNode(info.mContent); + if (!e) { + continue; + } + + if (info.mKey == AnonymousContentKey::None || !AllowStyleCaching()) { + // Most NAC subtrees do not use caching of computed styles. Just go + // ahead and eagerly style the subtree. + styleSet->StyleNewSubtree(e); + continue; + } + + // We have a NAC subtree for which we can use cached styles. + AutoTArray<RefPtr<ComputedStyle>, 2> cachedStyles; + AutoTArray<Element*, 2> elements; + + GatherSubtreeElements(e, elements); + styleSet->GetCachedAnonymousContentStyles(info.mKey, cachedStyles); + + if (cachedStyles.IsEmpty()) { + // We haven't stored cached styles for this kind of NAC subtree yet. + // Eagerly compute those styles, then cache them for later. + styleSet->StyleNewSubtree(e); + for (Element* e : elements) { + if (e->HasServoData()) { + cachedStyles.AppendElement(ServoStyleSet::ResolveServoStyle(*e)); + } else { + cachedStyles.AppendElement(nullptr); + } + } + styleSet->PutCachedAnonymousContentStyles(info.mKey, + std::move(cachedStyles)); + continue; + } + + // We previously stored cached styles for this kind of NAC subtree. + // Iterate over them and set them on the subtree's elements. + MOZ_ASSERT(cachedStyles.Length() == elements.Length(), + "should always produce the same size NAC subtree"); + for (size_t i = 0, len = cachedStyles.Length(); i != len; ++i) { + if (cachedStyles[i]) { +#ifdef DEBUG + // Assert that our cached style is the same as one we could compute. + RefPtr<ComputedStyle> cs = styleSet->ResolveStyleLazily(*elements[i]); + MOZ_ASSERT( + cachedStyles[i]->EqualForCachedAnonymousContentStyle(*cs), + "cached anonymous content styles should be identical to those we " + "would compute normally"); + // All overlay scrollbars start off as inactive, so we can rely on their + // pointer-events value being always none. + MOZ_ASSERT(!mPresShell->GetPresContext()->UseOverlayScrollbars() || + cs->StyleUI()->ComputedPointerEvents() == + StylePointerEvents::None); +#endif + Servo_SetExplicitStyle(elements[i], cachedStyles[i]); + } + } + } + + return NS_OK; +} + +// XUL frames are not allowed to be out of flow. +#define SIMPLE_XUL_FCDATA(_func) \ + FrameConstructionData(_func, \ + FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH) +#define SCROLLABLE_XUL_FCDATA(_func) \ + FrameConstructionData(_func, FCDATA_DISALLOW_OUT_OF_FLOW | \ + FCDATA_SKIP_ABSPOS_PUSH | \ + FCDATA_MAY_NEED_SCROLLFRAME) +// .. but we allow some XUL frames to be _containers_ for out-of-flow content +// (This is the same as SCROLLABLE_XUL_FCDATA, but w/o FCDATA_SKIP_ABSPOS_PUSH) +#define SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA(_func) \ + FrameConstructionData( \ + _func, FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_MAY_NEED_SCROLLFRAME) + +#define SIMPLE_XUL_CREATE(_tag, _func) \ + { nsGkAtoms::_tag, SIMPLE_XUL_FCDATA(_func) } +#define SCROLLABLE_XUL_CREATE(_tag, _func) \ + { nsGkAtoms::_tag, SCROLLABLE_XUL_FCDATA(_func) } + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindXULTagData(const Element& aElement, + ComputedStyle& aStyle) { + MOZ_ASSERT(aElement.IsXULElement()); + static constexpr FrameConstructionData kPopupData( + NS_NewMenuPopupFrame, FCDATA_IS_POPUP | FCDATA_SKIP_ABSPOS_PUSH); + + static constexpr FrameConstructionDataByTag sXULTagData[] = { + SIMPLE_XUL_CREATE(image, NS_NewImageBoxFrame), + SIMPLE_XUL_CREATE(treechildren, NS_NewTreeBodyFrame), + SIMPLE_XUL_CREATE(treecol, NS_NewTreeColFrame), + SIMPLE_TAG_CHAIN(label, + nsCSSFrameConstructor::FindXULLabelOrDescriptionData), + SIMPLE_TAG_CHAIN(description, + nsCSSFrameConstructor::FindXULLabelOrDescriptionData), +#ifdef XP_MACOSX + SIMPLE_TAG_CHAIN(menubar, nsCSSFrameConstructor::FindXULMenubarData), +#else + SIMPLE_XUL_CREATE(menubar, NS_NewMenuBarFrame), +#endif /* XP_MACOSX */ + SIMPLE_XUL_CREATE(iframe, NS_NewSubDocumentFrame), + SIMPLE_XUL_CREATE(editor, NS_NewSubDocumentFrame), + SIMPLE_XUL_CREATE(browser, NS_NewSubDocumentFrame), + SIMPLE_XUL_CREATE(splitter, NS_NewSplitterFrame), + SIMPLE_XUL_CREATE(slider, NS_NewSliderFrame), + SIMPLE_XUL_CREATE(scrollbar, NS_NewScrollbarFrame), + SIMPLE_XUL_CREATE(scrollbarbutton, NS_NewScrollbarButtonFrame), + {nsGkAtoms::panel, kPopupData}, + {nsGkAtoms::menupopup, kPopupData}, + {nsGkAtoms::tooltip, kPopupData}, + }; + + return FindDataByTag(aElement, aStyle, sXULTagData, ArrayLength(sXULTagData)); +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindXULLabelOrDescriptionData(const Element& aElement, + ComputedStyle&) { + // Follow CSS display value if no value attribute + if (!aElement.HasAttr(nsGkAtoms::value)) { + return nullptr; + } + + // Follow CSS display if there's no crop="center". + if (!aElement.AttrValueIs(kNameSpaceID_None, nsGkAtoms::crop, + nsGkAtoms::center, eCaseMatters)) { + return nullptr; + } + + static constexpr FrameConstructionData sXULTextBoxData = + SIMPLE_XUL_FCDATA(NS_NewTextBoxFrame); + return &sXULTextBoxData; +} + +#ifdef XP_MACOSX +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindXULMenubarData(const Element& aElement, + ComputedStyle&) { + if (aElement.OwnerDoc()->IsInChromeDocShell()) { + BrowsingContext* bc = aElement.OwnerDoc()->GetBrowsingContext(); + bool isRoot = bc && !bc->GetParent(); + if (isRoot) { + // This is the root. Suppress the menubar, since on Mac + // window menus are not attached to the window. + static constexpr FrameConstructionData sSuppressData = SUPPRESS_FCDATA(); + return &sSuppressData; + } + } + + static constexpr FrameConstructionData sMenubarData = + SIMPLE_XUL_FCDATA(NS_NewMenuBarFrame); + return &sMenubarData; +} +#endif /* XP_MACOSX */ + +already_AddRefed<ComputedStyle> nsCSSFrameConstructor::BeginBuildingScrollFrame( + nsFrameConstructorState& aState, nsIContent* aContent, + ComputedStyle* aContentStyle, nsContainerFrame* aParentFrame, + PseudoStyleType aScrolledPseudo, bool aIsRoot, + nsContainerFrame*& aNewFrame) { + nsContainerFrame* gfxScrollFrame = aNewFrame; + + nsFrameList anonymousList; + + if (!gfxScrollFrame) { + const bool useXULScrollFrame = [&] { + const auto& disp = *aContentStyle->StyleDisplay(); + if (disp.DisplayOutside() == StyleDisplayOutside::XUL) { + // XXX Should this be emulated? + return true; + } + if (disp.DisplayInside() == StyleDisplayInside::MozBox) { + return !aContentStyle->StyleVisibility()->EmulateMozBoxWithFlex(); + } + return false; + }(); + // Build a XULScrollFrame when the child is a box, otherwise an + // HTMLScrollFrame + if (useXULScrollFrame) { + gfxScrollFrame = NS_NewXULScrollFrame(mPresShell, aContentStyle, aIsRoot); + } else { + gfxScrollFrame = + NS_NewHTMLScrollFrame(mPresShell, aContentStyle, aIsRoot); + } + + InitAndRestoreFrame(aState, aContent, aParentFrame, gfxScrollFrame); + } + + MOZ_ASSERT(gfxScrollFrame); + + // if there are any anonymous children for the scroll frame, create + // frames for them. + // + // We can't take the normal ProcessChildren path, because the NAC needs to + // be parented to the scrollframe, and everything else needs to be parented + // to the scrolledframe. + AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> scrollNAC; + DebugOnly<nsresult> rv = + GetAnonymousContent(aContent, gfxScrollFrame, scrollNAC); + MOZ_ASSERT(NS_SUCCEEDED(rv)); + if (scrollNAC.Length() > 0) { + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(gfxScrollFrame, floatSaveState); + + AutoFrameConstructionItemList items(this); + AutoFrameConstructionPageName pageNameTracker(aState, gfxScrollFrame); + AddFCItemsForAnonymousContent(aState, gfxScrollFrame, scrollNAC, items, + pageNameTracker); + ConstructFramesFromItemList(aState, items, gfxScrollFrame, + /* aParentIsWrapperAnonBox = */ false, + anonymousList); + } + + aNewFrame = gfxScrollFrame; + gfxScrollFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // we used the style that was passed in. So resolve another one. + ServoStyleSet* styleSet = mPresShell->StyleSet(); + RefPtr<ComputedStyle> scrolledChildStyle = + styleSet->ResolveInheritingAnonymousBoxStyle(aScrolledPseudo, + aContentStyle); + + gfxScrollFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(anonymousList)); + + return scrolledChildStyle.forget(); +} + +void nsCSSFrameConstructor::FinishBuildingScrollFrame( + nsContainerFrame* aScrollFrame, nsIFrame* aScrolledFrame) { + aScrollFrame->AppendFrames(FrameChildListID::Principal, + nsFrameList(aScrolledFrame, aScrolledFrame)); +} + +/** + * Called to wrap a gfx scrollframe around a frame. The hierarchy will look like + * this + * + * ------- for gfx scrollbars ------ + * + * + * ScrollFrame + * ^ + * | + * Frame (scrolled frame you passed in) + * + * + * ----------------------------------- + * LEGEND: + * + * ScrollFrame: This is a frame that manages gfx cross platform frame based + * scrollbars. + * + * @param aContent the content node of the child to wrap. + * + * @param aScrolledFrame The frame of the content to wrap. This should not be + * Initialized. This method will initialize it with a scrolled pseudo and no + * nsIContent. The content will be attached to the scrollframe returned. + * + * @param aContentStyle the style that has already been resolved for the content + * being passed in. + * + * @param aParentFrame The parent to attach the scroll frame to + * + * @param aNewFrame The new scrollframe or gfx scrollframe that we create. It + * will contain the scrolled frame you passed in. (returned) If this is not + * null, we'll just use it + * + * @param aScrolledContentStyle the style that was resolved for the scrolled + * frame. (returned) + */ +void nsCSSFrameConstructor::BuildScrollFrame(nsFrameConstructorState& aState, + nsIContent* aContent, + ComputedStyle* aContentStyle, + nsIFrame* aScrolledFrame, + nsContainerFrame* aParentFrame, + nsContainerFrame*& aNewFrame) { + RefPtr<ComputedStyle> scrolledContentStyle = BeginBuildingScrollFrame( + aState, aContent, aContentStyle, aParentFrame, + PseudoStyleType::scrolledContent, false, aNewFrame); + + aScrolledFrame->SetComputedStyleWithoutNotification(scrolledContentStyle); + InitAndRestoreFrame(aState, aContent, aNewFrame, aScrolledFrame); + + FinishBuildingScrollFrame(aNewFrame, aScrolledFrame); +} + +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindDisplayData(const nsStyleDisplay& aDisplay, + const StyleMozBoxLayout aMozBoxLayout, + const Element& aElement) { + static_assert(eParentTypeCount < (1 << (32 - FCDATA_PARENT_TYPE_OFFSET)), + "Check eParentTypeCount should not overflow"); + + // The style system ensures that floated and positioned frames are + // block-level. + NS_ASSERTION( + !(aDisplay.IsFloatingStyle() || aDisplay.IsAbsolutelyPositionedStyle()) || + aDisplay.IsBlockOutsideStyle() || + aDisplay.DisplayOutside() == StyleDisplayOutside::XUL, + "Style system did not apply CSS2.1 section 9.7 fixups"); + + // If this is "body", try propagating its scroll style to the viewport + // Note that we need to do this even if the body is NOT scrollable; + // it might have dynamically changed from scrollable to not scrollable, + // and that might need to be propagated. + // XXXbz is this the right place to do this? If this code moves, + // make this function static. + bool propagatedScrollToViewport = false; + if (aElement.IsHTMLElement(nsGkAtoms::body)) { + if (nsPresContext* presContext = mPresShell->GetPresContext()) { + propagatedScrollToViewport = + presContext->UpdateViewportScrollStylesOverride() == &aElement; + MOZ_ASSERT(!propagatedScrollToViewport || + !mPresShell->GetPresContext()->IsPaginated(), + "Shouldn't propagate scroll in paginated contexts"); + } + } + + switch (aDisplay.DisplayInside()) { + case StyleDisplayInside::Flow: + case StyleDisplayInside::FlowRoot: { + if (aDisplay.IsInlineFlow()) { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructInline, + FCDATA_IS_INLINE | FCDATA_IS_LINE_PARTICIPANT); + return &data; + } + + // If the frame is a block-level frame and is scrollable, then wrap it in + // a scroll frame. Except we don't want to do that for paginated contexts + // for frames that are block-outside and aren't frames for native + // anonymous stuff. + // XXX Ignore tables for the time being (except caption) + const uint32_t kCaptionCtorFlags = + FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable); + bool caption = aDisplay.mDisplay == StyleDisplay::TableCaption; + bool suppressScrollFrame = false; + bool needScrollFrame = + aDisplay.IsScrollableOverflow() && !propagatedScrollToViewport; + if (needScrollFrame) { + suppressScrollFrame = mPresShell->GetPresContext()->IsPaginated() && + aDisplay.IsBlockOutsideStyle() && + !aElement.IsInNativeAnonymousSubtree(); + if (!suppressScrollFrame) { + static constexpr FrameConstructionData sScrollableBlockData[2] = { + {&nsCSSFrameConstructor::ConstructScrollableBlock}, + {&nsCSSFrameConstructor::ConstructScrollableBlock, + kCaptionCtorFlags}}; + return &sScrollableBlockData[caption]; + } + + // If the scrollable frame would have propagated its scrolling to the + // viewport, we still want to construct a regular block rather than a + // scrollframe so that it paginates correctly, but we don't want to set + // the bit on the block that tells it to clip at paint time. + if (mPresShell->GetPresContext()->ElementWouldPropagateScrollStyles( + aElement)) { + suppressScrollFrame = false; + } + } + + // Handle various non-scrollable blocks. + static constexpr FrameConstructionData sNonScrollableBlockData[2][2] = { + {{&nsCSSFrameConstructor::ConstructNonScrollableBlock}, + {&nsCSSFrameConstructor::ConstructNonScrollableBlock, + kCaptionCtorFlags}}, + {{&nsCSSFrameConstructor::ConstructNonScrollableBlock, + FCDATA_FORCED_NON_SCROLLABLE_BLOCK}, + {&nsCSSFrameConstructor::ConstructNonScrollableBlock, + FCDATA_FORCED_NON_SCROLLABLE_BLOCK | kCaptionCtorFlags}}}; + return &sNonScrollableBlockData[suppressScrollFrame][caption]; + } + case StyleDisplayInside::Table: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTable); + return &data; + } + // NOTE: In the unlikely event that we add another table-part here that + // has a desired-parent-type (& hence triggers table fixup), we'll need to + // also update the flexbox chunk in ComputedStyle::ApplyStyleFixups(). + case StyleDisplayInside::TableRowGroup: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)); + return &data; + } + case StyleDisplayInside::TableColumn: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableCol, + FCDATA_IS_TABLE_PART | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeColGroup)); + return &data; + } + case StyleDisplayInside::TableColumnGroup: { + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewTableColGroupFrame), + FCDATA_IS_TABLE_PART | FCDATA_DISALLOW_OUT_OF_FLOW | + FCDATA_SKIP_ABSPOS_PUSH | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)); + return &data; + } + case StyleDisplayInside::TableHeaderGroup: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)); + return &data; + } + case StyleDisplayInside::TableFooterGroup: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)); + return &data; + } + case StyleDisplayInside::TableRow: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup)); + return &data; + } + case StyleDisplayInside::TableCell: { + static constexpr FrameConstructionData data( + &nsCSSFrameConstructor::ConstructTableCell, + FCDATA_IS_TABLE_PART | FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow)); + return &data; + } + case StyleDisplayInside::MozBox: { + if (!aElement.IsInNativeAnonymousSubtree() && + aElement.OwnerDoc()->IsContentDocument()) { + aElement.OwnerDoc()->WarnOnceAbout( + DeprecatedOperations::eMozBoxOrInlineBoxDisplay); + } + + // If we're emulating -moz-box with flexbox, then treat it as non-XUL and + // fall through. + if (aMozBoxLayout == StyleMozBoxLayout::Legacy) { + static constexpr FrameConstructionData data = + SCROLLABLE_ABSPOS_CONTAINER_XUL_FCDATA( + ToCreationFunc(NS_NewBoxFrame)); + return &data; + } + [[fallthrough]]; + } + case StyleDisplayInside::Flex: + case StyleDisplayInside::WebkitBox: { + static constexpr FrameConstructionData nonScrollableData( + ToCreationFunc(NS_NewFlexContainerFrame)); + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewFlexContainerFrame), + FCDATA_MAY_NEED_SCROLLFRAME); + return MOZ_UNLIKELY(propagatedScrollToViewport) ? &nonScrollableData + : &data; + } + case StyleDisplayInside::Grid: { + static constexpr FrameConstructionData nonScrollableData( + ToCreationFunc(NS_NewGridContainerFrame)); + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewGridContainerFrame), + FCDATA_MAY_NEED_SCROLLFRAME); + return MOZ_UNLIKELY(propagatedScrollToViewport) ? &nonScrollableData + : &data; + } + case StyleDisplayInside::Ruby: { + static constexpr FrameConstructionData data[] = { + {&nsCSSFrameConstructor::ConstructBlockRubyFrame, + FCDATA_MAY_NEED_SCROLLFRAME}, + {ToCreationFunc(NS_NewRubyFrame), FCDATA_IS_LINE_PARTICIPANT}}; + bool isInline = aDisplay.DisplayOutside() == StyleDisplayOutside::Inline; + return &data[isInline]; + } + case StyleDisplayInside::RubyBase: { + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewRubyBaseFrame), + FCDATA_IS_LINE_PARTICIPANT | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyBaseContainer)); + return &data; + } + case StyleDisplayInside::RubyBaseContainer: { + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewRubyBaseContainerFrame), + FCDATA_IS_LINE_PARTICIPANT | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby)); + return &data; + } + case StyleDisplayInside::RubyText: { + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewRubyTextFrame), + FCDATA_IS_LINE_PARTICIPANT | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyTextContainer)); + return &data; + } + case StyleDisplayInside::RubyTextContainer: { + static constexpr FrameConstructionData data( + ToCreationFunc(NS_NewRubyTextContainerFrame), + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby)); + return &data; + } + default: + MOZ_ASSERT_UNREACHABLE("unknown 'display' value"); + return nullptr; + } +} + +nsIFrame* nsCSSFrameConstructor::ConstructScrollableBlock( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsContainerFrame* newFrame = nullptr; + RefPtr<ComputedStyle> scrolledContentStyle = BeginBuildingScrollFrame( + aState, content, computedStyle, + aState.GetGeometricParent(*aDisplay, aParentFrame), + PseudoStyleType::scrolledContent, false, newFrame); + + // Create our block frame + // pass a temporary stylecontext, the correct one will be set later + nsContainerFrame* scrolledFrame = + NS_NewBlockFormattingContext(mPresShell, computedStyle); + + // Make sure to AddChild before we call ConstructBlock so that we + // end up before our descendants in fixed-pos lists as needed. + aState.AddChild(newFrame, aFrameList, content, aParentFrame); + + nsFrameList blockList; + ConstructBlock( + aState, content, newFrame, newFrame, scrolledContentStyle, &scrolledFrame, + blockList, + aDisplay->IsAbsPosContainingBlock(newFrame) ? newFrame : nullptr); + + MOZ_ASSERT(blockList.OnlyChild() == scrolledFrame, + "Scrollframe's frameList should be exactly the scrolled frame!"); + FinishBuildingScrollFrame(newFrame, scrolledFrame); + + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructNonScrollableBlock( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + // We want a block formatting context root in paginated contexts for + // every block that would be scrollable in a non-paginated context. + // We mark our blocks with a bit here if this condition is true, so + // we can check it later in nsIFrame::ApplyPaginatedOverflowClipping. + bool clipPaginatedOverflow = + (aItem.mFCData->mBits & FCDATA_FORCED_NON_SCROLLABLE_BLOCK) != 0; + nsFrameState flags = nsFrameState(0); + if ((aDisplay->IsAbsolutelyPositionedStyle() || aDisplay->IsFloatingStyle() || + aDisplay->DisplayInside() == StyleDisplayInside::FlowRoot || + clipPaginatedOverflow) && + !SVGUtils::IsInSVGTextSubtree(aParentFrame)) { + flags = NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS; + if (clipPaginatedOverflow) { + flags |= NS_BLOCK_CLIP_PAGINATED_OVERFLOW; + } + } + + nsContainerFrame* newFrame = NS_NewBlockFrame(mPresShell, computedStyle); + newFrame->AddStateBits(flags); + ConstructBlock( + aState, aItem.mContent, + aState.GetGeometricParent(*aDisplay, aParentFrame), aParentFrame, + computedStyle, &newFrame, aFrameList, + aDisplay->IsAbsPosContainingBlock(newFrame) ? newFrame : nullptr); + return newFrame; +} + +void nsCSSFrameConstructor::InitAndRestoreFrame( + const nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame, nsIFrame* aNewFrame, bool aAllowCounters) { + MOZ_ASSERT(aNewFrame, "Null frame cannot be initialized"); + + // Initialize the frame + aNewFrame->Init(aContent, aParentFrame, nullptr); + aNewFrame->AddStateBits(aState.mAdditionalStateBits); + + if (aState.mFrameState) { + // Restore frame state for just the newly created frame. + RestoreFrameStateFor(aNewFrame, aState.mFrameState); + } + + if (aAllowCounters && + mContainStyleScopeManager.AddCounterChanges(aNewFrame)) { + CountersDirty(); + } +} + +already_AddRefed<ComputedStyle> nsCSSFrameConstructor::ResolveComputedStyle( + nsIContent* aContent) { + if (auto* element = Element::FromNode(aContent)) { + return ServoStyleSet::ResolveServoStyle(*element); + } + + MOZ_ASSERT(aContent->IsText(), + "shouldn't waste time creating ComputedStyles for " + "comments and processing instructions"); + + Element* parent = aContent->GetFlattenedTreeParentElement(); + MOZ_ASSERT(parent, "Text out of the flattened tree?"); + + // FIXME(emilio): The const_cast is unfortunate, but it's not worse than what + // we did before. + // + // We could use ResolveServoStyle, but that would involve extra unnecessary + // refcount traffic... + auto* parentStyle = + const_cast<ComputedStyle*>(Servo_Element_GetMaybeOutOfDateStyle(parent)); + MOZ_ASSERT(parentStyle, + "How are we inserting text frames in an unstyled element?"); + return mPresShell->StyleSet()->ResolveStyleForText(aContent, parentStyle); +} + +// MathML Mod - RBS +void nsCSSFrameConstructor::FlushAccumulatedBlock( + nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame, nsFrameList& aBlockList, + nsFrameList& aNewList) { + if (aBlockList.IsEmpty()) { + // Nothing to do + return; + } + + auto anonPseudo = PseudoStyleType::mozMathMLAnonymousBlock; + + ComputedStyle* parentContext = + nsIFrame::CorrectStyleParentFrame(aParentFrame, anonPseudo)->Style(); + ServoStyleSet* styleSet = mPresShell->StyleSet(); + RefPtr<ComputedStyle> blockContext = + styleSet->ResolveInheritingAnonymousBoxStyle(anonPseudo, parentContext); + + // then, create a block frame that will wrap the child frames. Make it a + // MathML frame so that Get(Absolute/Float)ContainingBlockFor know that this + // is not a suitable block. + nsContainerFrame* blockFrame = + NS_NewMathMLmathBlockFrame(mPresShell, blockContext); + + InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame); + ReparentFrames(this, blockFrame, aBlockList, false); + // We have to walk over aBlockList before we hand it over to blockFrame. + for (nsIFrame* f : aBlockList) { + f->SetParentIsWrapperAnonBox(); + } + // abs-pos and floats are disabled in MathML children so we don't have to + // worry about messing up those. + blockFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(aBlockList)); + aNewList.AppendFrame(nullptr, blockFrame); +} + +// Only <math> elements can be floated or positioned. All other MathML +// should be in-flow. +#define SIMPLE_MATHML_CREATE(_tag, _func) \ + { \ + nsGkAtoms::_tag, { \ + _func, FCDATA_DISALLOW_OUT_OF_FLOW | \ + FCDATA_FORCE_NULL_ABSPOS_CONTAINER | \ + FCDATA_WRAP_KIDS_IN_BLOCKS \ + } \ + } + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindMathMLData(const Element& aElement, + ComputedStyle& aStyle) { + MOZ_ASSERT(aElement.IsMathMLElement()); + + nsAtom* tag = aElement.NodeInfo()->NameAtom(); + + // Handle <math> specially, because it sometimes produces inlines + if (tag == nsGkAtoms::math) { + // The IsBlockOutsideStyle() check must match what + // specified::Display::equivalent_block_display is checking for + // already-block-outside things. Though the behavior here for the + // display:table case is pretty weird... + if (aStyle.StyleDisplay()->IsBlockOutsideStyle()) { + static constexpr FrameConstructionData sBlockMathData( + ToCreationFunc(NS_NewMathMLmathBlockFrame), + FCDATA_FORCE_NULL_ABSPOS_CONTAINER | FCDATA_WRAP_KIDS_IN_BLOCKS); + return &sBlockMathData; + } + + static constexpr FrameConstructionData sInlineMathData( + ToCreationFunc(NS_NewMathMLmathInlineFrame), + FCDATA_FORCE_NULL_ABSPOS_CONTAINER | FCDATA_IS_LINE_PARTICIPANT | + FCDATA_WRAP_KIDS_IN_BLOCKS); + return &sInlineMathData; + } + + if (!StaticPrefs:: + mathml_legacy_maction_and_semantics_implementations_disabled()) { + static constexpr FrameConstructionDataByTag sMactionAndSemanticsData[] = { + SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmactionFrame), + SIMPLE_MATHML_CREATE(semantics_, NS_NewMathMLsemanticsFrame)}; + const FrameConstructionData* data = + FindDataByTag(aElement, aStyle, sMactionAndSemanticsData, + ArrayLength(sMactionAndSemanticsData)); + if (data) { + return data; + } + } + + static constexpr FrameConstructionDataByTag sMathMLData[] = { + SIMPLE_MATHML_CREATE(annotation_, NS_NewMathMLTokenFrame), + SIMPLE_MATHML_CREATE(annotation_xml_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mi_, NS_NewMathMLTokenFrame), + SIMPLE_MATHML_CREATE(mn_, NS_NewMathMLTokenFrame), + SIMPLE_MATHML_CREATE(ms_, NS_NewMathMLTokenFrame), + SIMPLE_MATHML_CREATE(mtext_, NS_NewMathMLTokenFrame), + SIMPLE_MATHML_CREATE(mo_, NS_NewMathMLmoFrame), + SIMPLE_MATHML_CREATE(mfrac_, NS_NewMathMLmfracFrame), + SIMPLE_MATHML_CREATE(msup_, NS_NewMathMLmmultiscriptsFrame), + SIMPLE_MATHML_CREATE(msub_, NS_NewMathMLmmultiscriptsFrame), + SIMPLE_MATHML_CREATE(msubsup_, NS_NewMathMLmmultiscriptsFrame), + SIMPLE_MATHML_CREATE(munder_, NS_NewMathMLmunderoverFrame), + SIMPLE_MATHML_CREATE(mover_, NS_NewMathMLmunderoverFrame), + SIMPLE_MATHML_CREATE(munderover_, NS_NewMathMLmunderoverFrame), + SIMPLE_MATHML_CREATE(mphantom_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mpadded_, NS_NewMathMLmpaddedFrame), + SIMPLE_MATHML_CREATE(mspace_, NS_NewMathMLmspaceFrame), + SIMPLE_MATHML_CREATE(none, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mprescripts_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mfenced_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mmultiscripts_, NS_NewMathMLmmultiscriptsFrame), + SIMPLE_MATHML_CREATE(mstyle_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(msqrt_, NS_NewMathMLmsqrtFrame), + SIMPLE_MATHML_CREATE(mroot_, NS_NewMathMLmrootFrame), + SIMPLE_MATHML_CREATE(maction_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(mrow_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(merror_, NS_NewMathMLmrowFrame), + SIMPLE_MATHML_CREATE(menclose_, NS_NewMathMLmencloseFrame), + SIMPLE_MATHML_CREATE(semantics_, NS_NewMathMLmrowFrame)}; + + return FindDataByTag(aElement, aStyle, sMathMLData, ArrayLength(sMathMLData)); +} + +nsContainerFrame* nsCSSFrameConstructor::ConstructFrameWithAnonymousChild( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, nsFrameList& aFrameList, + ContainerFrameCreationFunc aConstructor, + ContainerFrameCreationFunc aInnerConstructor, PseudoStyleType aInnerPseudo, + bool aCandidateRootFrame) { + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + // Create the outer frame: + nsContainerFrame* newFrame = aConstructor(mPresShell, computedStyle); + + InitAndRestoreFrame(aState, content, + aCandidateRootFrame + ? aState.GetGeometricParent( + *computedStyle->StyleDisplay(), aParentFrame) + : aParentFrame, + newFrame); + newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + + // Create the pseudo SC for the anonymous wrapper child as a child of the SC: + RefPtr<ComputedStyle> scForAnon = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle(aInnerPseudo, + computedStyle); + + // Create the anonymous inner wrapper frame + nsContainerFrame* innerFrame = aInnerConstructor(mPresShell, scForAnon); + + InitAndRestoreFrame(aState, content, newFrame, innerFrame); + + // Put the newly created frames into the right child list + SetInitialSingleChild(newFrame, innerFrame); + + aState.AddChild(newFrame, aFrameList, content, aParentFrame, + aCandidateRootFrame, aCandidateRootFrame); + + if (!mRootElementFrame && aCandidateRootFrame) { + // The frame we're constructing will be the root element frame. + SetRootElementFrameAndConstructCanvasAnonContent(newFrame, aState, + aFrameList); + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(innerFrame, floatSaveState); + + nsFrameList childList; + + // Process children + if (aItem.mFCData->mBits & FCDATA_USE_CHILD_ITEMS) { + ConstructFramesFromItemList( + aState, aItem.mChildItems, innerFrame, + aItem.mFCData->mBits & FCDATA_IS_WRAPPER_ANON_BOX, childList); + } else { + ProcessChildren(aState, content, computedStyle, innerFrame, true, childList, + false); + } + + // Set the inner wrapper frame's initial primary list + innerFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::ConstructOuterSVG( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + return ConstructFrameWithAnonymousChild( + aState, aItem, aParentFrame, aFrameList, NS_NewSVGOuterSVGFrame, + NS_NewSVGOuterSVGAnonChildFrame, PseudoStyleType::mozSVGOuterSVGAnonChild, + true); +} + +nsIFrame* nsCSSFrameConstructor::ConstructMarker( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + return ConstructFrameWithAnonymousChild( + aState, aItem, aParentFrame, aFrameList, NS_NewSVGMarkerFrame, + NS_NewSVGMarkerAnonChildFrame, PseudoStyleType::mozSVGMarkerAnonChild, + false); +} + +// Only outer <svg> elements can be floated or positioned. All other SVG +// should be in-flow. +#define SIMPLE_SVG_FCDATA(_func) \ + FrameConstructionData(ToCreationFunc(_func), \ + FCDATA_DISALLOW_OUT_OF_FLOW | \ + FCDATA_SKIP_ABSPOS_PUSH | \ + FCDATA_DISALLOW_GENERATED_CONTENT) +#define SIMPLE_SVG_CREATE(_tag, _func) \ + { nsGkAtoms::_tag, SIMPLE_SVG_FCDATA(_func) } + +static bool IsFilterPrimitiveChildTag(const nsAtom* aTag) { + return aTag == nsGkAtoms::feDistantLight || aTag == nsGkAtoms::fePointLight || + aTag == nsGkAtoms::feSpotLight || aTag == nsGkAtoms::feFuncR || + aTag == nsGkAtoms::feFuncG || aTag == nsGkAtoms::feFuncB || + aTag == nsGkAtoms::feFuncA || aTag == nsGkAtoms::feMergeNode; +} + +/* static */ +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindSVGData(const Element& aElement, + nsIFrame* aParentFrame, + bool aIsWithinSVGText, + bool aAllowsTextPathChild, + ComputedStyle& aStyle) { + MOZ_ASSERT(aElement.IsSVGElement()); + + static constexpr FrameConstructionData sSuppressData = SUPPRESS_FCDATA(); + static constexpr FrameConstructionData sContainerData = + SIMPLE_SVG_FCDATA(NS_NewSVGContainerFrame); + + bool parentIsSVG = aIsWithinSVGText; + nsIContent* parentContent = + aParentFrame ? aParentFrame->GetContent() : nullptr; + + nsAtom* tag = aElement.NodeInfo()->NameAtom(); + + // XXXbz should this really be based on the tag of the parent frame's content? + // Should it not be based on the type of the parent frame (e.g. whether it's + // an SVG frame)? + if (parentContent) { + // It's not clear whether the SVG spec intends to allow any SVG + // content within svg:foreignObject at all (SVG 1.1, section + // 23.2), but if it does, it better be svg:svg. So given that + // we're allowing it, treat it as a non-SVG parent. + parentIsSVG = + parentContent->IsSVGElement() && + parentContent->NodeInfo()->NameAtom() != nsGkAtoms::foreignObject; + } + + if ((tag != nsGkAtoms::svg && !parentIsSVG) || + (tag == nsGkAtoms::desc || tag == nsGkAtoms::title || + tag == nsGkAtoms::metadata)) { + // Sections 5.1 and G.4 of SVG 1.1 say that SVG elements other than + // svg:svg not contained within svg:svg are incorrect, although they + // don't seem to specify error handling. Ignore them, since many of + // our frame classes can't deal. It *may* be that the document + // should at that point be considered in error according to F.2, but + // it's hard to tell. + // + // Style mutation can't change this situation, so don't bother + // adding to the undisplayed content map. + // + // We don't currently handle any UI for desc/title/metadata + return &sSuppressData; + } + + // We don't need frames for animation elements + if (nsCOMPtr<SVGAnimationElement> animationElement = + do_QueryInterface(const_cast<Element*>(&aElement))) { + return &sSuppressData; + } + + if (tag == nsGkAtoms::svg && !parentIsSVG) { + // We need outer <svg> elements to have an SVGOuterSVGFrame regardless + // of whether they fail conditional processing attributes, since various + // SVG frames assume that one exists. We handle the non-rendering + // of failing outer <svg> element contents like <switch> statements, + // and do the PassesConditionalProcessingTests call in + // SVGOuterSVGFrame::Init. + static constexpr FrameConstructionData sOuterSVGData( + &nsCSSFrameConstructor::ConstructOuterSVG); + return &sOuterSVGData; + } + + if (tag == nsGkAtoms::marker) { + static constexpr FrameConstructionData sMarkerSVGData( + &nsCSSFrameConstructor::ConstructMarker); + return &sMarkerSVGData; + } + + nsCOMPtr<SVGTests> tests = do_QueryInterface(const_cast<Element*>(&aElement)); + if (tests && !tests->PassesConditionalProcessingTests()) { + // Elements with failing conditional processing attributes never get + // rendered. Note that this is not where we select which frame in a + // <switch> to render! That happens in SVGSwitchFrame::PaintSVG. + if (aIsWithinSVGText) { + // SVGTextFrame doesn't handle conditional processing attributes, + // so don't create frames for descendants of <text> with failing + // attributes. We need frames not to be created so that text layout + // is correct. + return &sSuppressData; + } + // If we're not inside <text>, create an SVGContainerFrame (which is a + // frame that doesn't render) so that paint servers can still be referenced, + // even if they live inside an element with failing conditional processing + // attributes. + return &sContainerData; + } + + // Ensure that a stop frame is a child of a gradient and that gradients + // can only have stop children. + bool parentIsGradient = aParentFrame && static_cast<SVGGradientFrame*>( + do_QueryFrame(aParentFrame)); + bool stop = (tag == nsGkAtoms::stop); + if ((parentIsGradient && !stop) || (!parentIsGradient && stop)) { + return &sSuppressData; + } + + // Prevent bad frame types being children of filters or parents of filter + // primitives. If aParentFrame is null, we know that the frame that will + // be created will be an nsInlineFrame, so it can never be a filter. + bool parentIsFilter = aParentFrame && aParentFrame->IsSVGFilterFrame(); + nsCOMPtr<SVGFE> filterPrimitive = + do_QueryInterface(const_cast<Element*>(&aElement)); + if ((parentIsFilter && !filterPrimitive) || + (!parentIsFilter && filterPrimitive)) { + return &sSuppressData; + } + + // Prevent bad frame types being children of filter primitives or parents of + // filter primitive children. If aParentFrame is null, we know that the frame + // that will be created will be an nsInlineFrame, so it can never be a filter + // primitive. + bool parentIsFEContainerFrame = + aParentFrame && aParentFrame->IsSVGFEContainerFrame(); + if ((parentIsFEContainerFrame && !IsFilterPrimitiveChildTag(tag)) || + (!parentIsFEContainerFrame && IsFilterPrimitiveChildTag(tag))) { + return &sSuppressData; + } + + // Special cases for text/tspan/textPath, because the kind of frame + // they get depends on the parent frame. We ignore 'a' elements when + // determining the parent, however. + if (aIsWithinSVGText) { + // If aIsWithinSVGText is true, then we know that the "SVG text uses + // CSS frames" pref was true when this SVG fragment was first constructed. + // + // FIXME(bug 1588477) Don't render stuff in display: contents / Shadow DOM + // subtrees, because TextCorrespondenceRecorder in the SVG text code doesn't + // really know how to deal with it. This kinda sucks. :( + if (aParentFrame && aParentFrame->GetContent() != aElement.GetParent()) { + return &sSuppressData; + } + + // We don't use ConstructInline because we want different behavior + // for generated content. + static constexpr FrameConstructionData sTSpanData( + ToCreationFunc(NS_NewInlineFrame), + FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_SKIP_ABSPOS_PUSH | + FCDATA_DISALLOW_GENERATED_CONTENT | FCDATA_IS_LINE_PARTICIPANT | + FCDATA_IS_INLINE | FCDATA_USE_CHILD_ITEMS); + if (tag == nsGkAtoms::textPath) { + if (aAllowsTextPathChild) { + return &sTSpanData; + } + } else if (tag == nsGkAtoms::tspan || tag == nsGkAtoms::a) { + return &sTSpanData; + } + return &sSuppressData; + } else if (tag == nsGkAtoms::tspan || tag == nsGkAtoms::textPath) { + return &sSuppressData; + } + + static constexpr FrameConstructionDataByTag sSVGData[] = { + SIMPLE_SVG_CREATE(svg, NS_NewSVGInnerSVGFrame), + SIMPLE_SVG_CREATE(g, NS_NewSVGGFrame), + SIMPLE_SVG_CREATE(svgSwitch, NS_NewSVGSwitchFrame), + SIMPLE_SVG_CREATE(symbol, NS_NewSVGSymbolFrame), + SIMPLE_SVG_CREATE(polygon, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(polyline, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(circle, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(ellipse, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(line, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(rect, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(path, NS_NewSVGGeometryFrame), + SIMPLE_SVG_CREATE(defs, NS_NewSVGContainerFrame), + {nsGkAtoms::text, + {NS_NewSVGTextFrame, + FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_ALLOW_BLOCK_STYLES, + PseudoStyleType::mozSVGText}}, + {nsGkAtoms::foreignObject, + {ToCreationFunc(NS_NewSVGForeignObjectFrame), + FCDATA_DISALLOW_OUT_OF_FLOW, PseudoStyleType::mozSVGForeignContent}}, + SIMPLE_SVG_CREATE(a, NS_NewSVGAFrame), + SIMPLE_SVG_CREATE(linearGradient, NS_NewSVGLinearGradientFrame), + SIMPLE_SVG_CREATE(radialGradient, NS_NewSVGRadialGradientFrame), + SIMPLE_SVG_CREATE(stop, NS_NewSVGStopFrame), + SIMPLE_SVG_CREATE(use, NS_NewSVGUseFrame), + SIMPLE_SVG_CREATE(view, NS_NewSVGViewFrame), + SIMPLE_SVG_CREATE(image, NS_NewSVGImageFrame), + SIMPLE_SVG_CREATE(clipPath, NS_NewSVGClipPathFrame), + SIMPLE_SVG_CREATE(filter, NS_NewSVGFilterFrame), + SIMPLE_SVG_CREATE(pattern, NS_NewSVGPatternFrame), + SIMPLE_SVG_CREATE(mask, NS_NewSVGMaskFrame), + SIMPLE_SVG_CREATE(feDistantLight, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(fePointLight, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feSpotLight, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feBlend, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feColorMatrix, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feFuncR, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feFuncG, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feFuncB, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feFuncA, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feComposite, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feComponentTransfer, NS_NewSVGFEContainerFrame), + SIMPLE_SVG_CREATE(feConvolveMatrix, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feDiffuseLighting, NS_NewSVGFEContainerFrame), + SIMPLE_SVG_CREATE(feDisplacementMap, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feDropShadow, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feFlood, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feGaussianBlur, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feImage, NS_NewSVGFEImageFrame), + SIMPLE_SVG_CREATE(feMerge, NS_NewSVGFEContainerFrame), + SIMPLE_SVG_CREATE(feMergeNode, NS_NewSVGFEUnstyledLeafFrame), + SIMPLE_SVG_CREATE(feMorphology, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feOffset, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feSpecularLighting, NS_NewSVGFEContainerFrame), + SIMPLE_SVG_CREATE(feTile, NS_NewSVGFELeafFrame), + SIMPLE_SVG_CREATE(feTurbulence, NS_NewSVGFELeafFrame)}; + + const FrameConstructionData* data = + FindDataByTag(aElement, aStyle, sSVGData, ArrayLength(sSVGData)); + + if (!data) { + data = &sContainerData; + } + + return data; +} + +void nsCSSFrameConstructor::InsertPageBreakItem( + nsIContent* aContent, FrameConstructionItemList& aItems, + InsertPageBreakLocation location) { + RefPtr<ComputedStyle> pseudoStyle = + mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle( + PseudoStyleType::pageBreak); + + MOZ_ASSERT(pseudoStyle->StyleDisplay()->mDisplay == StyleDisplay::Block, + "Unexpected display"); + + static constexpr FrameConstructionData sPageBreakData(NS_NewPageBreakFrame, + FCDATA_SKIP_FRAMESET); + if (location == InsertPageBreakLocation::eBefore) { + aItems.PrependItem(this, &sPageBreakData, aContent, pseudoStyle.forget(), + true); + } else { + aItems.AppendItem(this, &sPageBreakData, aContent, pseudoStyle.forget(), + true); + } +} + +bool nsCSSFrameConstructor::ShouldCreateItemsForChild( + nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame) { + aContent->UnsetFlags(NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME); + // XXX the GetContent() != aContent check is needed due to bug 135040. + // Remove it once that's fixed. + if (aContent->GetPrimaryFrame() && + aContent->GetPrimaryFrame()->GetContent() == aContent && + !aState.mCreatingExtraFrames) { + MOZ_ASSERT(false, + "asked to create frame construction item for a node that " + "already has a frame"); + return false; + } + + // don't create a whitespace frame if aParent doesn't want it + if (!NeedFrameFor(aState, aParentFrame, aContent)) { + return false; + } + + // never create frames for comments or PIs + if (aContent->IsComment() || aContent->IsProcessingInstruction()) { + return false; + } + + return true; +} + +void nsCSSFrameConstructor::AddFrameConstructionItems( + nsFrameConstructorState& aState, nsIContent* aContent, + bool aSuppressWhiteSpaceOptimizations, const ComputedStyle& aParentStyle, + const InsertionPoint& aInsertion, FrameConstructionItemList& aItems, + ItemFlags aFlags) { + nsContainerFrame* parentFrame = aInsertion.mParentFrame; + if (!ShouldCreateItemsForChild(aState, aContent, parentFrame)) { + return; + } + if (MOZ_UNLIKELY(aParentStyle.StyleContent()->mContent.IsNone()) && + StaticPrefs::layout_css_element_content_none_enabled()) { + return; + } + + RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(aContent); + auto flags = aFlags + ItemFlag::AllowPageBreak; + if (parentFrame) { + if (SVGUtils::IsInSVGTextSubtree(parentFrame)) { + flags += ItemFlag::IsWithinSVGText; + } + if (parentFrame->IsBlockFrame() && parentFrame->GetParent() && + parentFrame->GetParent()->IsSVGTextFrame()) { + flags += ItemFlag::AllowTextPathChild; + } + } + AddFrameConstructionItemsInternal(aState, aContent, parentFrame, + aSuppressWhiteSpaceOptimizations, + computedStyle, flags, aItems); +} + +// Whether we should suppress frames for a child under a <select> frame. +// +// Never create frames for non-option/optgroup kids of <select> and non-option +// kids of <optgroup> inside a <select>. +static bool ShouldSuppressFrameInSelect(const nsIContent* aParent, + const nsIContent& aChild) { + if (!aParent || + !aParent->IsAnyOfHTMLElements(nsGkAtoms::select, nsGkAtoms::optgroup, + nsGkAtoms::option)) { + return false; + } + + // Options with labels have their label text added in ::before by forms.css. + // Suppress frames for their child text. + if (aParent->IsHTMLElement(nsGkAtoms::option) && + !aChild.IsRootOfNativeAnonymousSubtree()) { + return aParent->AsElement()->HasNonEmptyAttr(nsGkAtoms::label); + } + + // If we're in any display: contents subtree, just suppress the frame. + // + // We can't be regular NAC, since display: contents has no frame to generate + // them off. + if (aChild.GetParent() != aParent) { + return true; + } + + // Option is always fine. + if (aChild.IsHTMLElement(nsGkAtoms::option)) { + return false; + } + + // <optgroup> is OK in <select> but not in <optgroup>. + if (aChild.IsHTMLElement(nsGkAtoms::optgroup) && + aParent->IsHTMLElement(nsGkAtoms::select)) { + return false; + } + + // Allow native anonymous content no matter what. + if (aChild.IsRootOfNativeAnonymousSubtree()) { + return false; + } + + return true; +} + +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindDataForContent(nsIContent& aContent, + ComputedStyle& aStyle, + nsIFrame* aParentFrame, + ItemFlags aFlags) { + MOZ_ASSERT(aStyle.StyleDisplay()->mDisplay != StyleDisplay::None && + aStyle.StyleDisplay()->mDisplay != StyleDisplay::Contents, + "These two special display values should be handled earlier"); + + if (auto* text = Text::FromNode(aContent)) { + return FindTextData(*text, aParentFrame); + } + + return FindElementData(*aContent.AsElement(), aStyle, aParentFrame, aFlags); +} + +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindElementData(const Element& aElement, + ComputedStyle& aStyle, + nsIFrame* aParentFrame, + ItemFlags aFlags) { + // Don't create frames for non-SVG element children of SVG elements. + if (!aElement.IsSVGElement()) { + if (aParentFrame && IsFrameForSVG(aParentFrame) && + !aParentFrame->IsSVGForeignObjectFrame()) { + return nullptr; + } + if (aFlags.contains(ItemFlag::IsWithinSVGText)) { + return nullptr; + } + } + + if (auto* data = FindElementTagData(aElement, aStyle, aParentFrame, aFlags)) { + return data; + } + + // Check for 'content: <image-url>' on the element (which makes us ignore + // 'display' values other than 'none' or 'contents'). + if (nsImageFrame::ShouldCreateImageFrameForContentProperty(aElement, + aStyle)) { + static constexpr FrameConstructionData sImgData( + NS_NewImageFrameForContentProperty); + return &sImgData; + } + + const auto boxLayout = aStyle.StyleVisibility()->mMozBoxLayout; + const bool shouldBlockify = aFlags.contains(ItemFlag::IsForRenderedLegend) || + aFlags.contains(ItemFlag::IsForOutsideMarker); + if (shouldBlockify && !aStyle.StyleDisplay()->IsBlockOutsideStyle()) { + // Make a temp copy of StyleDisplay and blockify its mDisplay value. + auto display = *aStyle.StyleDisplay(); + bool isRootElement = false; + uint16_t rawDisplayValue = + Servo_ComputedValues_BlockifiedDisplay(&aStyle, isRootElement); + display.mDisplay = StyleDisplay(rawDisplayValue); + return FindDisplayData(display, boxLayout, aElement); + } + + const auto& display = *aStyle.StyleDisplay(); + return FindDisplayData(display, boxLayout, aElement); +} + +const nsCSSFrameConstructor::FrameConstructionData* +nsCSSFrameConstructor::FindElementTagData(const Element& aElement, + ComputedStyle& aStyle, + nsIFrame* aParentFrame, + ItemFlags aFlags) { + switch (aElement.GetNameSpaceID()) { + case kNameSpaceID_XHTML: + return FindHTMLData(aElement, aParentFrame, aStyle); + case kNameSpaceID_MathML: + return FindMathMLData(aElement, aStyle); + case kNameSpaceID_SVG: + return FindSVGData(aElement, aParentFrame, + aFlags.contains(ItemFlag::IsWithinSVGText), + aFlags.contains(ItemFlag::AllowTextPathChild), aStyle); + case kNameSpaceID_XUL: + return FindXULTagData(aElement, aStyle); + default: + return nullptr; + } +} + +void nsCSSFrameConstructor::AddFrameConstructionItemsInternal( + nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame, bool aSuppressWhiteSpaceOptimizations, + ComputedStyle* aComputedStyle, ItemFlags aFlags, + FrameConstructionItemList& aItems) { + MOZ_ASSERT(aContent->IsText() || aContent->IsElement(), + "Shouldn't get anything else here!"); + MOZ_ASSERT(aContent->IsInComposedDoc()); + MOZ_ASSERT(!aContent->GetPrimaryFrame() || aState.mCreatingExtraFrames || + aContent->NodeInfo()->NameAtom() == nsGkAtoms::area); + + const bool withinSVGText = aFlags.contains(ItemFlag::IsWithinSVGText); + const bool isGeneratedContent = aFlags.contains(ItemFlag::IsGeneratedContent); + MOZ_ASSERT(!isGeneratedContent || aComputedStyle->IsPseudoElement(), + "Generated content should be a pseudo-element"); + + FrameConstructionItem* item = nullptr; + auto cleanupGeneratedContent = mozilla::MakeScopeExit([&]() { + if (isGeneratedContent && !item) { + MOZ_ASSERT(!IsDisplayContents(aContent), + "This would need to change if we support display: contents " + "in generated content"); + aContent->UnbindFromTree(); + } + }); + + // 'display:none' elements never creates any frames at all. + const nsStyleDisplay& display = *aComputedStyle->StyleDisplay(); + if (display.mDisplay == StyleDisplay::None) { + return; + } + + if (display.mDisplay == StyleDisplay::Contents) { + // See the mDisplay fixup code in StyleAdjuster::adjust. + MOZ_ASSERT(!aContent->AsElement()->IsRootOfNativeAnonymousSubtree(), + "display:contents on anonymous content is unsupported"); + + // FIXME(bug 1588477): <svg:text>'s TextNodeCorrespondenceRecorder has + // trouble with everything that looks like display: contents. + if (withinSVGText) { + return; + } + + CreateGeneratedContentItem(aState, aParentFrame, *aContent->AsElement(), + *aComputedStyle, PseudoStyleType::before, + aItems); + + FlattenedChildIterator iter(aContent); + InsertionPoint insertion(aParentFrame, aContent); + for (nsIContent* child = iter.GetNextChild(); child; + child = iter.GetNextChild()) { + AddFrameConstructionItems(aState, child, aSuppressWhiteSpaceOptimizations, + *aComputedStyle, insertion, aItems, aFlags); + } + aItems.SetParentHasNoShadowDOM(!iter.ShadowDOMInvolved()); + + CreateGeneratedContentItem(aState, aParentFrame, *aContent->AsElement(), + *aComputedStyle, PseudoStyleType::after, aItems); + return; + } + + nsIContent* parent = aParentFrame ? aParentFrame->GetContent() : nullptr; + if (ShouldSuppressFrameInSelect(parent, *aContent)) { + return; + } + + if (aContent->IsHTMLElement(nsGkAtoms::legend) && aParentFrame) { + const nsFieldSetFrame* const fs = GetFieldSetFrameFor(aParentFrame); + if (fs && !fs->GetLegend() && !aState.mHasRenderedLegend && + !aComputedStyle->StyleDisplay()->IsFloatingStyle() && + !aComputedStyle->StyleDisplay()->IsAbsolutelyPositionedStyle()) { + aState.mHasRenderedLegend = true; + aFlags += ItemFlag::IsForRenderedLegend; + } + } + + const FrameConstructionData* const data = + FindDataForContent(*aContent, *aComputedStyle, aParentFrame, aFlags); + if (!data || data->mBits & FCDATA_SUPPRESS_FRAME) { + return; + } + + const bool isPopup = data->mBits & FCDATA_IS_POPUP; + + const uint32_t bits = data->mBits; + + // Inside colgroups, suppress everything except columns. + if (aParentFrame && aParentFrame->IsTableColGroupFrame() && + (!(bits & FCDATA_IS_TABLE_PART) || + display.mDisplay != StyleDisplay::TableColumn)) { + return; + } + + const bool canHavePageBreak = + aFlags.contains(ItemFlag::AllowPageBreak) && + aState.mPresContext->IsPaginated() && + !display.IsAbsolutelyPositionedStyle() && + !(aParentFrame && aParentFrame->IsGridContainerFrame()) && + !(bits & FCDATA_IS_TABLE_PART) && !(bits & FCDATA_IS_SVG_TEXT); + if (canHavePageBreak && display.BreakBefore()) { + AppendPageBreakItem(aContent, aItems); + } + + if (!item) { + item = aItems.AppendItem(this, data, aContent, do_AddRef(aComputedStyle), + aSuppressWhiteSpaceOptimizations); + if (aFlags.contains(ItemFlag::IsForRenderedLegend)) { + item->mIsRenderedLegend = true; + } + } + item->mIsText = !aContent->IsElement(); + item->mIsGeneratedContent = isGeneratedContent; + if (isGeneratedContent) { + // We need to keep this alive until the frame takes ownership. + // This corresponds to the Release in ConstructFramesFromItem. + item->mContent->AddRef(); + } + item->mIsPopup = isPopup; + + if (canHavePageBreak && display.BreakAfter()) { + AppendPageBreakItem(aContent, aItems); + } + + if (bits & FCDATA_IS_INLINE) { + // To correctly set item->mIsAllInline we need to build up our child items + // right now. + BuildInlineChildItems(aState, *item, + aFlags.contains(ItemFlag::IsWithinSVGText), + aFlags.contains(ItemFlag::AllowTextPathChild)); + item->mIsBlock = false; + } else { + // Compute a boolean isInline which is guaranteed to be false for blocks + // (but may also be false for some inlines). + const bool isInline = + // Table-internal things are inline-outside if and only if they're kids + // of inlines, since they'll trigger construction of inline-table + // pseudos. + ((bits & FCDATA_IS_TABLE_PART) && + (!aParentFrame || // No aParentFrame means inline + aParentFrame->StyleDisplay()->IsInlineFlow())) || + // Things that are inline-outside but aren't inline frames are inline + display.IsInlineOutsideStyle() || + // Popups that are certainly out of flow. + isPopup; + + // Set mIsAllInline conservatively. It just might be that even an inline + // that has mIsAllInline false doesn't need an {ib} split. So this is just + // an optimization to keep from doing too much work in cases when we can + // show that mIsAllInline is true.. + item->mIsAllInline = + isInline || + // Figure out whether we're guaranteed this item will be out of flow. + // This is not a precise test, since one of our ancestor inlines might + // add an absolute containing block (if it's relatively positioned) when + // there wasn't such a containing block before. But it's conservative + // in the sense that anything that will really end up as an in-flow + // non-inline will test false here. In other words, if this test is + // true we're guaranteed to be inline; if it's false we don't know what + // we'll end up as. + // + // If we make this test precise, we can remove some of the code dealing + // with the imprecision in ConstructInline and adjust the comments on + // mIsAllInline and mIsBlock in the header. + (!(bits & FCDATA_DISALLOW_OUT_OF_FLOW) && + aState.GetGeometricParent(display, nullptr)); + + // Set mIsBlock conservatively. It's OK to set it false for some real + // blocks, but not OK to set it true for things that aren't blocks. Since + // isOutOfFlow might be false even in cases when the frame will end up + // out-of-flow, we can't use it here. But we _can_ say that the frame will + // for sure end up in-flow if it's not floated or absolutely positioned. + item->mIsBlock = !isInline && !display.IsAbsolutelyPositionedStyle() && + !display.IsFloatingStyle() && !(bits & FCDATA_IS_SVG_TEXT); + } + + if (item->mIsAllInline) { + aItems.InlineItemAdded(); + } else if (item->mIsBlock) { + aItems.BlockItemAdded(); + } +} + +/** + * Return true if the frame construction item pointed to by aIter will + * create a frame adjacent to a line boundary in the frame tree, and that + * line boundary is induced by a content node adjacent to the frame's + * content node in the content tree. The latter condition is necessary so + * that ContentAppended/ContentInserted/ContentRemoved can easily find any + * text nodes that were suppressed here. + */ +bool nsCSSFrameConstructor::AtLineBoundary(FCItemIterator& aIter) { + if (aIter.item().mSuppressWhiteSpaceOptimizations) { + return false; + } + + if (aIter.AtStart()) { + if (aIter.List()->HasLineBoundaryAtStart() && + !aIter.item().mContent->GetPreviousSibling()) + return true; + } else { + FCItemIterator prev = aIter; + prev.Prev(); + if (prev.item().IsLineBoundary() && + !prev.item().mSuppressWhiteSpaceOptimizations && + aIter.item().mContent->GetPreviousSibling() == prev.item().mContent) + return true; + } + + FCItemIterator next = aIter; + next.Next(); + if (next.IsDone()) { + if (aIter.List()->HasLineBoundaryAtEnd() && + !aIter.item().mContent->GetNextSibling()) + return true; + } else { + if (next.item().IsLineBoundary() && + !next.item().mSuppressWhiteSpaceOptimizations && + aIter.item().mContent->GetNextSibling() == next.item().mContent) + return true; + } + + return false; +} + +void nsCSSFrameConstructor::ConstructFramesFromItem( + nsFrameConstructorState& aState, FCItemIterator& aIter, + nsContainerFrame* aParentFrame, nsFrameList& aFrameList) { + FrameConstructionItem& item = aIter.item(); + ComputedStyle* computedStyle = item.mComputedStyle; + if (item.mIsText) { + // If this is collapsible whitespace next to a line boundary, + // don't create a frame. item.IsWhitespace() also sets the + // NS_CREATE_FRAME_IF_NON_WHITESPACE flag in the text node. (If we + // end up creating a frame, nsTextFrame::Init will clear the flag.) + // We don't do this for generated content, because some generated + // text content is empty text nodes that are about to be initialized. + // (We check mAdditionalStateBits because only the generated content + // container's frame construction item is marked with + // mIsGeneratedContent, and we might not have an aParentFrame.) + // We don't do it for content that may have Shadow DOM siblings / insertion + // points, because they make it difficult to correctly create the frame due + // to dynamic changes. + // We don't do it for SVG text, since we might need to position and + // measure the white space glyphs due to x/y/dx/dy attributes. + if (AtLineBoundary(aIter) && + !computedStyle->StyleText()->WhiteSpaceOrNewlineIsSignificant() && + aIter.List()->ParentHasNoShadowDOM() && + !(aState.mAdditionalStateBits & NS_FRAME_GENERATED_CONTENT) && + (item.mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) && + !(item.mFCData->mBits & FCDATA_IS_SVG_TEXT) && + !mAlwaysCreateFramesForIgnorableWhitespace && item.IsWhitespace(aState)) + return; + + ConstructTextFrame(item.mFCData, aState, item.mContent, aParentFrame, + computedStyle, aFrameList); + return; + } + + AutoRestore<nsFrameState> savedStateBits(aState.mAdditionalStateBits); + if (item.mIsGeneratedContent) { + // Ensure that frames created here are all tagged with + // NS_FRAME_GENERATED_CONTENT. + aState.mAdditionalStateBits |= NS_FRAME_GENERATED_CONTENT; + } + + // XXXbz maybe just inline ConstructFrameFromItemInternal here or something? + ConstructFrameFromItemInternal(item, aState, aParentFrame, aFrameList); + + if (item.mIsGeneratedContent) { + // This corresponds to the AddRef in AddFrameConstructionItemsInternal. + // The frame owns the generated content now. + item.mContent->Release(); + + // Now that we've passed ownership of item.mContent to the frame, unset + // our generated content flag so we don't release or unbind it ourselves. + item.mIsGeneratedContent = false; + } +} + +nsContainerFrame* nsCSSFrameConstructor::GetAbsoluteContainingBlock( + nsIFrame* aFrame, ContainingBlockType aType) { + // Starting with aFrame, look for a frame that is absolutely positioned or + // relatively positioned (and transformed, if aType is FIXED) + for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) { + if (frame->IsFrameOfType(nsIFrame::eMathML)) { + // If it's mathml, bail out -- no absolute positioning out from inside + // mathml frames. Note that we don't make this part of the loop + // condition because of the stuff at the end of this method... + return nullptr; + } + + // Look for the ICB. + if (aType == FIXED_POS) { + LayoutFrameType t = frame->Type(); + if (t == LayoutFrameType::Viewport || t == LayoutFrameType::PageContent) { + return static_cast<nsContainerFrame*>(frame); + } + } + + // If the frame is positioned, we will probably return it as the containing + // block (see the exceptions below). Otherwise, we'll start looking at the + // parent frame, unless we're dealing with a scrollframe. + // Scrollframes are special since they're not positioned, but their + // scrolledframe might be. So, we need to check this special case to return + // the correct containing block (the scrolledframe) in that case. + // If we're looking for a fixed-pos containing block and the frame is + // not transformed, skip it. + if (!frame->IsAbsPosContainingBlock() || + (aType == FIXED_POS && !frame->IsFixedPosContainingBlock())) { + continue; + } + nsIFrame* absPosCBCandidate = frame; + LayoutFrameType type = absPosCBCandidate->Type(); + if (type == LayoutFrameType::FieldSet) { + absPosCBCandidate = + static_cast<nsFieldSetFrame*>(absPosCBCandidate)->GetInner(); + if (!absPosCBCandidate) { + continue; + } + type = absPosCBCandidate->Type(); + } + if (type == LayoutFrameType::Scroll) { + nsIScrollableFrame* scrollFrame = do_QueryFrame(absPosCBCandidate); + absPosCBCandidate = scrollFrame->GetScrolledFrame(); + if (!absPosCBCandidate) { + continue; + } + type = absPosCBCandidate->Type(); + } + // Only first continuations can be containing blocks. + absPosCBCandidate = absPosCBCandidate->FirstContinuation(); + // Is the frame really an absolute container? + if (!absPosCBCandidate->IsAbsoluteContainer()) { + continue; + } + + // For tables, skip the inner frame and consider the table wrapper frame. + if (type == LayoutFrameType::Table) { + continue; + } + // For table wrapper frames, we can just return absPosCBCandidate. + MOZ_ASSERT((nsContainerFrame*)do_QueryFrame(absPosCBCandidate), + "abs.pos. containing block must be nsContainerFrame sub-class"); + return static_cast<nsContainerFrame*>(absPosCBCandidate); + } + + MOZ_ASSERT(aType != FIXED_POS, "no ICB in this frame tree?"); + + // It is possible for the search for the containing block to fail, because + // no absolute container can be found in the parent chain. In those cases, + // we fall back to the document element's containing block. + return mDocElementContainingBlock; +} + +nsContainerFrame* nsCSSFrameConstructor::GetFloatContainingBlock( + nsIFrame* aFrame) { + // Starting with aFrame, look for a frame that is a float containing block. + // If we hit a frame which prevents its descendants from floating, bail out. + // The logic here needs to match the logic in MaybePushFloatContainingBlock(). + for (nsIFrame* containingBlock = aFrame; + containingBlock && !ShouldSuppressFloatingOfDescendants(containingBlock); + containingBlock = containingBlock->GetParent()) { + if (containingBlock->IsFloatContainingBlock()) { + MOZ_ASSERT((nsContainerFrame*)do_QueryFrame(containingBlock), + "float containing block must be nsContainerFrame sub-class"); + return static_cast<nsContainerFrame*>(containingBlock); + } + } + + // If we didn't find a containing block, then there just isn't + // one.... return null + return nullptr; +} + +/** + * This function will get the previous sibling to use for an append operation. + * + * It takes a parent frame (must not be null) and the next insertion sibling, if + * the parent content is display: contents or has ::after content (may be null). + */ +static nsIFrame* FindAppendPrevSibling(nsIFrame* aParentFrame, + nsIFrame* aNextSibling) { + aParentFrame->DrainSelfOverflowList(); + + if (aNextSibling) { + MOZ_ASSERT( + aNextSibling->GetParent()->GetContentInsertionFrame() == aParentFrame, + "Wrong parent"); + return aNextSibling->GetPrevSibling(); + } + + return aParentFrame->PrincipalChildList().LastChild(); +} + +/** + * Finds the right parent frame to append content to aParentFrame. + * + * Cannot return or receive null. + */ +static nsContainerFrame* ContinuationToAppendTo( + nsContainerFrame* aParentFrame) { + MOZ_ASSERT(aParentFrame); + + if (IsFramePartOfIBSplit(aParentFrame)) { + // If the frame we are manipulating is a ib-split frame (that is, one that's + // been created as a result of a block-in-inline situation) then we need to + // append to the last ib-split sibling, not to the frame itself. + // + // Always make sure to look at the last continuation of the frame for the + // {ib} case, even if that continuation is empty. + // + // We don't do this for the non-ib-split-frame case, since in the other + // cases appending to the last nonempty continuation is fine and in fact not + // doing that can confuse code that doesn't know to pull kids from + // continuations other than its next one. + return static_cast<nsContainerFrame*>( + GetLastIBSplitSibling(aParentFrame)->LastContinuation()); + } + + return nsLayoutUtils::LastContinuationWithChild(aParentFrame); +} + +/** + * This function will get the next sibling for a frame insert operation given + * the parent and previous sibling. aPrevSibling may be null. + */ +static nsIFrame* GetInsertNextSibling(nsIFrame* aParentFrame, + nsIFrame* aPrevSibling) { + if (aPrevSibling) { + return aPrevSibling->GetNextSibling(); + } + + return aParentFrame->PrincipalChildList().FirstChild(); +} + +void nsCSSFrameConstructor::AppendFramesToParent( + nsFrameConstructorState& aState, nsContainerFrame* aParentFrame, + nsFrameList& aFrameList, nsIFrame* aPrevSibling, bool aIsRecursiveCall) { + MOZ_ASSERT( + !IsFramePartOfIBSplit(aParentFrame) || !GetIBSplitSibling(aParentFrame) || + !GetIBSplitSibling(aParentFrame)->PrincipalChildList().FirstChild(), + "aParentFrame has a ib-split sibling with kids?"); + MOZ_ASSERT(!aPrevSibling || aPrevSibling->GetParent() == aParentFrame, + "Parent and prevsibling don't match"); + MOZ_ASSERT( + !aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) || + !IsFramePartOfIBSplit(aParentFrame), + "We should have wiped aParentFrame in WipeContainingBlock() " + "if it's part of an IB split!"); + + nsIFrame* nextSibling = ::GetInsertNextSibling(aParentFrame, aPrevSibling); + + NS_ASSERTION(nextSibling || !aParentFrame->GetNextContinuation() || + !aParentFrame->GetNextContinuation() + ->PrincipalChildList() + .FirstChild() || + aIsRecursiveCall, + "aParentFrame has later continuations with kids?"); + NS_ASSERTION( + nextSibling || !IsFramePartOfIBSplit(aParentFrame) || + (IsInlineFrame(aParentFrame) && !GetIBSplitSibling(aParentFrame) && + !aParentFrame->GetNextContinuation()) || + aIsRecursiveCall, + "aParentFrame is not last?"); + + // If we're inserting a list of frames at the end of the trailing inline + // of an {ib} split, we may need to create additional {ib} siblings to parent + // them. + if (!nextSibling && IsFramePartOfIBSplit(aParentFrame)) { + // When we get here, our frame list might start with a block. If it does + // so, and aParentFrame is an inline, and it and all its previous + // continuations have no siblings, then put the initial blocks from the + // frame list into the previous block of the {ib} split. Note that we + // didn't want to stop at the block part of the split when figuring out + // initial parent, because that could screw up float parenting; it's easier + // to do this little fixup here instead. + if (aFrameList.NotEmpty() && aFrameList.FirstChild()->IsBlockOutside()) { + // See whether our trailing inline is empty + nsIFrame* firstContinuation = aParentFrame->FirstContinuation(); + if (firstContinuation->PrincipalChildList().IsEmpty()) { + // Our trailing inline is empty. Collect our starting blocks from + // aFrameList, get the right parent frame for them, and put them in. + nsFrameList blockKids = + aFrameList.Split([](nsIFrame* f) { return !f->IsBlockOutside(); }); + NS_ASSERTION(blockKids.NotEmpty(), "No blocks?"); + + nsContainerFrame* prevBlock = GetIBSplitPrevSibling(firstContinuation); + prevBlock = + static_cast<nsContainerFrame*>(prevBlock->LastContinuation()); + NS_ASSERTION(prevBlock, "Should have previous block here"); + + MoveChildrenTo(aParentFrame, prevBlock, blockKids); + } + } + + // We want to put some of the frames into this inline frame. + nsFrameList inlineKids = + aFrameList.Split([](nsIFrame* f) { return f->IsBlockOutside(); }); + + if (!inlineKids.IsEmpty()) { + AppendFrames(aParentFrame, FrameChildListID::Principal, + std::move(inlineKids)); + } + + if (!aFrameList.IsEmpty()) { + nsFrameList ibSiblings; + CreateIBSiblings(aState, aParentFrame, + aParentFrame->IsAbsPosContainingBlock(), aFrameList, + ibSiblings); + + // Make sure to trigger reflow of the inline that used to be our + // last one and now isn't anymore, since its GetSkipSides() has + // changed. + mPresShell->FrameNeedsReflow(aParentFrame, + IntrinsicDirty::FrameAndAncestors, + NS_FRAME_HAS_DIRTY_CHILDREN); + + // Recurse so we create new ib siblings as needed for aParentFrame's + // parent + return AppendFramesToParent(aState, aParentFrame->GetParent(), ibSiblings, + aParentFrame, true); + } + return; + } + + // If we're appending a list of frames to the last continuations of a + // ::-moz-column-content, we may need to create column-span siblings for them. + if (!nextSibling && IsLastContinuationForColumnContent(aParentFrame)) { + // Extract any initial non-column-span kids, and append them to + // ::-moz-column-content's child list. + nsFrameList initialNonColumnSpanKids = + aFrameList.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + AppendFrames(aParentFrame, FrameChildListID::Principal, + std::move(initialNonColumnSpanKids)); + + if (aFrameList.IsEmpty()) { + // No more kids to process (there weren't any column-span kids). + return; + } + + nsFrameList columnSpanSiblings = CreateColumnSpanSiblings( + aState, aParentFrame, aFrameList, + // Column content should never be a absolute/fixed positioned containing + // block. Pass nullptr as aPositionedFrame. + nullptr); + + nsContainerFrame* columnSetWrapper = aParentFrame->GetParent(); + while (!columnSetWrapper->IsColumnSetWrapperFrame()) { + columnSetWrapper = columnSetWrapper->GetParent(); + } + MOZ_ASSERT(columnSetWrapper, + "No ColumnSetWrapperFrame ancestor for -moz-column-content?"); + + FinishBuildingColumns(aState, columnSetWrapper, aParentFrame, + columnSpanSiblings); + + MOZ_ASSERT(columnSpanSiblings.IsEmpty(), + "The column-span siblings should be moved to the proper place!"); + return; + } + + // Insert the frames after our aPrevSibling + InsertFrames(aParentFrame, FrameChildListID::Principal, aPrevSibling, + std::move(aFrameList)); +} + +// This gets called to see if the frames corresponding to aSibling and aContent +// should be siblings in the frame tree. Although (1) rows and cols, (2) row +// groups and col groups, (3) row groups and captions, (4) legends and content +// inside fieldsets, (5) popups and other kids of the menu are siblings from a +// content perspective, they are not considered siblings in the frame tree. +bool nsCSSFrameConstructor::IsValidSibling(nsIFrame* aSibling, + nsIContent* aContent, + Maybe<StyleDisplay>& aDisplay) { + StyleDisplay siblingDisplay = aSibling->GetDisplay(); + if (StyleDisplay::TableColumnGroup == siblingDisplay || + StyleDisplay::TableColumn == siblingDisplay || + StyleDisplay::TableCaption == siblingDisplay || + StyleDisplay::TableHeaderGroup == siblingDisplay || + StyleDisplay::TableRowGroup == siblingDisplay || + StyleDisplay::TableFooterGroup == siblingDisplay) { + // if we haven't already, resolve a style to find the display type of + // aContent. + if (aDisplay.isNothing()) { + if (aContent->IsComment() || aContent->IsProcessingInstruction()) { + // Comments and processing instructions never have frames, so we should + // not try to generate styles for them. + return false; + } + // FIXME(emilio): This is buggy some times, see bug 1424656. + RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(aContent); + const nsStyleDisplay* display = computedStyle->StyleDisplay(); + aDisplay.emplace(display->mDisplay); + } + + StyleDisplay display = aDisplay.value(); + // To have decent performance we want to return false in cases in which + // reordering the two siblings has no effect on display. To ensure + // correctness, we MUST return false in cases where the two siblings have + // the same desired parent type and live on different display lists. + // Specificaly, columns and column groups should only consider columns and + // column groups as valid siblings. Captions should only consider other + // captions. All other things should consider each other as valid + // siblings. The restriction in the |if| above on siblingDisplay is ok, + // because for correctness the only part that really needs to happen is to + // not consider captions, column groups, and row/header/footer groups + // siblings of each other. Treating a column or colgroup as a valid + // sibling of a non-table-related frame will just mean we end up reframing. + if ((siblingDisplay == StyleDisplay::TableCaption) != + (display == StyleDisplay::TableCaption)) { + // One's a caption and the other is not. Not valid siblings. + return false; + } + + if ((siblingDisplay == StyleDisplay::TableColumnGroup || + siblingDisplay == StyleDisplay::TableColumn) != + (display == StyleDisplay::TableColumnGroup || + display == StyleDisplay::TableColumn)) { + // One's a column or column group and the other is not. Not valid + // siblings. + return false; + } + // Fall through; it's possible that the display type was overridden and + // a different sort of frame was constructed, so we may need to return false + // below. + } + + return true; +} + +// FIXME(emilio): If we ever kill IsValidSibling() we can simplify this quite a +// bit (no need to pass aTargetContent or aTargetContentDisplay, and the +// adjust() calls can be responsibility of the caller). +template <nsCSSFrameConstructor::SiblingDirection aDirection> +nsIFrame* nsCSSFrameConstructor::FindSiblingInternal( + FlattenedChildIterator& aIter, nsIContent* aTargetContent, + Maybe<StyleDisplay>& aTargetContentDisplay) { + auto adjust = [&](nsIFrame* aPotentialSiblingFrame) -> nsIFrame* { + return AdjustSiblingFrame(aPotentialSiblingFrame, aTargetContent, + aTargetContentDisplay, aDirection); + }; + + auto nextDomSibling = [](FlattenedChildIterator& aIter) -> nsIContent* { + return aDirection == SiblingDirection::Forward ? aIter.GetNextChild() + : aIter.GetPreviousChild(); + }; + + auto getInsideMarkerFrame = [](const nsIContent* aContent) -> nsIFrame* { + auto* marker = nsLayoutUtils::GetMarkerFrame(aContent); + const bool isInsideMarker = + marker && marker->GetInFlowParent()->StyleList()->mListStylePosition == + StyleListStylePosition::Inside; + return isInsideMarker ? marker : nullptr; + }; + + auto getNearPseudo = [&](const nsIContent* aContent) -> nsIFrame* { + if (aDirection == SiblingDirection::Forward) { + if (auto* marker = getInsideMarkerFrame(aContent)) { + return marker; + } + return nsLayoutUtils::GetBeforeFrame(aContent); + } + return nsLayoutUtils::GetAfterFrame(aContent); + }; + + auto getFarPseudo = [&](const nsIContent* aContent) -> nsIFrame* { + if (aDirection == SiblingDirection::Forward) { + return nsLayoutUtils::GetAfterFrame(aContent); + } + if (auto* before = nsLayoutUtils::GetBeforeFrame(aContent)) { + return before; + } + return getInsideMarkerFrame(aContent); + }; + + while (nsIContent* sibling = nextDomSibling(aIter)) { + // NOTE(emilio): It's important to check GetPrimaryFrame() before + // IsDisplayContents to get the correct insertion point when multiple + // siblings go from display: non-none to display: contents. + if (nsIFrame* primaryFrame = sibling->GetPrimaryFrame()) { + // XXX the GetContent() == sibling check is needed due to bug 135040. + // Remove it once that's fixed. + if (primaryFrame->GetContent() == sibling) { + if (nsIFrame* frame = adjust(primaryFrame)) { + return frame; + } + } + } + + if (IsDisplayContents(sibling)) { + if (nsIFrame* frame = adjust(getNearPseudo(sibling))) { + return frame; + } + + const bool startFromBeginning = aDirection == SiblingDirection::Forward; + FlattenedChildIterator iter(sibling, startFromBeginning); + nsIFrame* sibling = FindSiblingInternal<aDirection>( + iter, aTargetContent, aTargetContentDisplay); + if (sibling) { + return sibling; + } + } + } + + return adjust(getFarPseudo(aIter.Parent())); +} + +nsIFrame* nsCSSFrameConstructor::AdjustSiblingFrame( + nsIFrame* aSibling, nsIContent* aTargetContent, + Maybe<StyleDisplay>& aTargetContentDisplay, SiblingDirection aDirection) { + if (!aSibling) { + return nullptr; + } + + if (aSibling->IsRenderedLegend()) { + return nullptr; + } + + if (aSibling->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) { + aSibling = aSibling->GetPlaceholderFrame(); + MOZ_ASSERT(aSibling); + } + + MOZ_ASSERT(!aSibling->GetPrevContinuation(), "How?"); + if (aDirection == SiblingDirection::Backward) { + // The frame may be a ib-split frame (a split inline frame that contains a + // block). Get the last part of that split. + if (IsFramePartOfIBSplit(aSibling)) { + aSibling = GetLastIBSplitSibling(aSibling); + } + + // The frame may have a continuation. If so, we want the last + // non-overflow-container continuation as our previous sibling. + aSibling = aSibling->GetTailContinuation(); + } + + if (!IsValidSibling(aSibling, aTargetContent, aTargetContentDisplay)) { + return nullptr; + } + + return aSibling; +} + +nsIFrame* nsCSSFrameConstructor::FindPreviousSibling( + const FlattenedChildIterator& aIter, + Maybe<StyleDisplay>& aTargetContentDisplay) { + return FindSibling<SiblingDirection::Backward>(aIter, aTargetContentDisplay); +} + +nsIFrame* nsCSSFrameConstructor::FindNextSibling( + const FlattenedChildIterator& aIter, + Maybe<StyleDisplay>& aTargetContentDisplay) { + return FindSibling<SiblingDirection::Forward>(aIter, aTargetContentDisplay); +} + +template <nsCSSFrameConstructor::SiblingDirection aDirection> +nsIFrame* nsCSSFrameConstructor::FindSibling( + const FlattenedChildIterator& aIter, + Maybe<StyleDisplay>& aTargetContentDisplay) { + nsIContent* targetContent = aIter.Get(); + FlattenedChildIterator siblingIter = aIter; + nsIFrame* sibling = FindSiblingInternal<aDirection>( + siblingIter, targetContent, aTargetContentDisplay); + if (sibling) { + return sibling; + } + + // Our siblings (if any) do not have a frame to guide us. The frame for the + // target content should be inserted whereever a frame for the container would + // be inserted. This is needed when inserting into display: contents nodes. + const nsIContent* current = aIter.Parent(); + while (IsDisplayContents(current)) { + const nsIContent* parent = current->GetFlattenedTreeParent(); + MOZ_ASSERT(parent, "No display: contents on the root"); + + FlattenedChildIterator iter(parent); + iter.Seek(current); + sibling = FindSiblingInternal<aDirection>(iter, targetContent, + aTargetContentDisplay); + if (sibling) { + return sibling; + } + + current = parent; + } + + return nullptr; +} + +// For fieldsets, returns the area frame, if the child is not a legend. +static nsContainerFrame* GetAdjustedParentFrame(nsContainerFrame* aParentFrame, + nsIContent* aChildContent) { + MOZ_ASSERT(!aParentFrame->IsTableWrapperFrame(), "Shouldn't be happening!"); + + nsContainerFrame* newParent = nullptr; + if (aParentFrame->IsFieldSetFrame()) { + // If the parent is a fieldSet, use the fieldSet's area frame as the + // parent unless the new content is a legend. + if (!aChildContent->IsHTMLElement(nsGkAtoms::legend)) { + newParent = static_cast<nsFieldSetFrame*>(aParentFrame)->GetInner(); + if (newParent) { + newParent = newParent->GetContentInsertionFrame(); + } + } + } + return newParent ? newParent : aParentFrame; +} + +nsIFrame* nsCSSFrameConstructor::GetInsertionPrevSibling( + InsertionPoint* aInsertion, nsIContent* aChild, bool* aIsAppend, + bool* aIsRangeInsertSafe, nsIContent* aStartSkipChild, + nsIContent* aEndSkipChild) { + MOZ_ASSERT(aInsertion->mParentFrame, "Must have parent frame to start with"); + + *aIsAppend = false; + + // Find the frame that precedes the insertion point. + FlattenedChildIterator iter(aInsertion->mContainer); + if (iter.ShadowDOMInvolved() || !aChild->IsRootOfNativeAnonymousSubtree()) { + // The check for IsRootOfNativeAnonymousSubtree() is because editor is + // severely broken and calls us directly for native anonymous + // nodes that it creates. + if (aStartSkipChild) { + iter.Seek(aStartSkipChild); + } else { + iter.Seek(aChild); + } + } else { + // Prime the iterator for the call to FindPreviousSibling. + iter.GetNextChild(); + MOZ_ASSERT(aChild->GetProperty(nsGkAtoms::restylableAnonymousNode), + "Someone passed native anonymous content directly into frame " + "construction. Stop doing that!"); + } + + // Note that FindPreviousSibling is passed the iterator by value, so that + // the later usage of the iterator starts from the same place. + Maybe<StyleDisplay> childDisplay; + nsIFrame* prevSibling = FindPreviousSibling(iter, childDisplay); + + // Now, find the geometric parent so that we can handle + // continuations properly. Use the prev sibling if we have it; + // otherwise use the next sibling. + if (prevSibling) { + aInsertion->mParentFrame = + prevSibling->GetParent()->GetContentInsertionFrame(); + } else { + // If there is no previous sibling, then find the frame that follows + // + // FIXME(emilio): This is really complex and probably shouldn't be. + if (aEndSkipChild) { + iter.Seek(aEndSkipChild); + iter.GetPreviousChild(); + } + if (nsIFrame* nextSibling = FindNextSibling(iter, childDisplay)) { + aInsertion->mParentFrame = + nextSibling->GetParent()->GetContentInsertionFrame(); + } else { + // No previous or next sibling, so treat this like an appended frame. + *aIsAppend = true; + + // Deal with fieldsets. + aInsertion->mParentFrame = + ::GetAdjustedParentFrame(aInsertion->mParentFrame, aChild); + + aInsertion->mParentFrame = + ::ContinuationToAppendTo(aInsertion->mParentFrame); + + prevSibling = ::FindAppendPrevSibling(aInsertion->mParentFrame, nullptr); + } + } + + *aIsRangeInsertSafe = childDisplay.isNothing(); + return prevSibling; +} + +nsContainerFrame* nsCSSFrameConstructor::GetContentInsertionFrameFor( + nsIContent* aContent) { + nsIFrame* frame; + while (!(frame = aContent->GetPrimaryFrame())) { + if (!IsDisplayContents(aContent)) { + return nullptr; + } + + aContent = aContent->GetFlattenedTreeParent(); + if (!aContent) { + return nullptr; + } + } + + // If the content of the frame is not the desired content then this is not + // really a frame for the desired content. + // XXX This check is needed due to bug 135040. Remove it once that's fixed. + if (frame->GetContent() != aContent) { + return nullptr; + } + + nsContainerFrame* insertionFrame = frame->GetContentInsertionFrame(); + + NS_ASSERTION(!insertionFrame || insertionFrame == frame || !frame->IsLeaf(), + "The insertion frame is the primary frame or the primary frame " + "isn't a leaf"); + + return insertionFrame; +} + +static bool IsSpecialFramesetChild(nsIContent* aContent) { + // IMPORTANT: This must match the conditions in nsHTMLFramesetFrame::Init. + return aContent->IsAnyOfHTMLElements(nsGkAtoms::frameset, nsGkAtoms::frame); +} + +static void InvalidateCanvasIfNeeded(PresShell* aPresShell, nsIContent* aNode); + +void nsCSSFrameConstructor::AddTextItemIfNeeded( + nsFrameConstructorState& aState, const ComputedStyle& aParentStyle, + const InsertionPoint& aInsertion, nsIContent* aPossibleTextContent, + FrameConstructionItemList& aItems) { + MOZ_ASSERT(aPossibleTextContent, "Must have node"); + if (!aPossibleTextContent->IsText() || + !aPossibleTextContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) || + aPossibleTextContent->HasFlag(NODE_NEEDS_FRAME)) { + // Not text, or not suppressed due to being all-whitespace (if it were being + // suppressed, it would have the NS_CREATE_FRAME_IF_NON_WHITESPACE flag), or + // going to be reframed anyway. + return; + } + MOZ_ASSERT(!aPossibleTextContent->GetPrimaryFrame(), + "Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE"); + AddFrameConstructionItems(aState, aPossibleTextContent, false, aParentStyle, + aInsertion, aItems); +} + +void nsCSSFrameConstructor::ReframeTextIfNeeded(nsIContent* aContent) { + if (!aContent->IsText() || + !aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) || + aContent->HasFlag(NODE_NEEDS_FRAME)) { + // Not text, or not suppressed due to being all-whitespace (if it were being + // suppressed, it would have the NS_CREATE_FRAME_IF_NON_WHITESPACE flag), or + // going to be reframed anyway. + return; + } + MOZ_ASSERT(!aContent->GetPrimaryFrame(), + "Text node has a frame and NS_CREATE_FRAME_IF_NON_WHITESPACE"); + ContentInserted(aContent, InsertionKind::Async); +} + +#ifdef DEBUG +void nsCSSFrameConstructor::CheckBitsForLazyFrameConstruction( + nsIContent* aParent) { + // If we hit a node with no primary frame, or the NODE_NEEDS_FRAME bit set + // we want to assert, but leaf frames that process their own children and may + // ignore anonymous children (eg framesets) make this complicated. So we set + // these two booleans if we encounter these situations and unset them if we + // hit a node with a leaf frame. + // + // It's fine if one of node without primary frame is in a display:none + // subtree. + // + // Also, it's fine if one of the nodes without primary frame is a display: + // contents node. + bool noPrimaryFrame = false; + bool needsFrameBitSet = false; + nsIContent* content = aParent; + while (content && !content->HasFlag(NODE_DESCENDANTS_NEED_FRAMES)) { + if (content->GetPrimaryFrame() && content->GetPrimaryFrame()->IsLeaf()) { + noPrimaryFrame = needsFrameBitSet = false; + } + if (!noPrimaryFrame && !content->GetPrimaryFrame()) { + noPrimaryFrame = !IsDisplayContents(content); + } + if (!needsFrameBitSet && content->HasFlag(NODE_NEEDS_FRAME)) { + needsFrameBitSet = true; + } + + content = content->GetFlattenedTreeParent(); + } + if (content && content->GetPrimaryFrame() && + content->GetPrimaryFrame()->IsLeaf()) { + noPrimaryFrame = needsFrameBitSet = false; + } + MOZ_ASSERT(!noPrimaryFrame, + "Ancestors of nodes with frames to be " + "constructed lazily should have frames"); + MOZ_ASSERT(!needsFrameBitSet, + "Ancestors of nodes with frames to be " + "constructed lazily should not have NEEDS_FRAME bit set"); +} +#endif + +// Returns true if this operation can be lazy, false if not. +// +// FIXME(emilio, bug 1410020): This function assumes that the flattened tree +// parent of all the appended children is the same, which, afaict, is not +// necessarily true. +void nsCSSFrameConstructor::ConstructLazily(Operation aOperation, + nsIContent* aChild) { + MOZ_ASSERT(aChild->GetParent()); + + // We can construct lazily; just need to set suitable bits in the content + // tree. + Element* parent = aChild->GetFlattenedTreeParentElement(); + if (!parent) { + // Not part of the flat tree, nothing to do. + return; + } + + if (Servo_Element_IsDisplayNone(parent)) { + // Nothing to do either. + // + // FIXME(emilio): This should be an assert, except for weird <frameset> + // stuff that does its own frame construction. Such an assert would fire in + // layout/style/crashtests/1411478.html, for example. + return; + } + + // Set NODE_NEEDS_FRAME on the new nodes. + if (aOperation == CONTENTINSERT) { + NS_ASSERTION(!aChild->GetPrimaryFrame() || + aChild->GetPrimaryFrame()->GetContent() != aChild, + // XXX the aChild->GetPrimaryFrame()->GetContent() != aChild + // check is needed due to bug 135040. Remove it once that's + // fixed. + "setting NEEDS_FRAME on a node that already has a frame?"); + aChild->SetFlags(NODE_NEEDS_FRAME); + } else { // CONTENTAPPEND + for (nsIContent* child = aChild; child; child = child->GetNextSibling()) { + NS_ASSERTION(!child->GetPrimaryFrame() || + child->GetPrimaryFrame()->GetContent() != child, + // XXX the child->GetPrimaryFrame()->GetContent() != child + // check is needed due to bug 135040. Remove it once that's + // fixed. + "setting NEEDS_FRAME on a node that already has a frame?"); + child->SetFlags(NODE_NEEDS_FRAME); + } + } + + CheckBitsForLazyFrameConstruction(parent); + parent->NoteDescendantsNeedFramesForServo(); +} + +void nsCSSFrameConstructor::IssueSingleInsertNofications( + nsIContent* aStartChild, nsIContent* aEndChild, + InsertionKind aInsertionKind) { + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + // XXX the GetContent() != child check is needed due to bug 135040. + // Remove it once that's fixed. + MOZ_ASSERT(!child->GetPrimaryFrame() || + child->GetPrimaryFrame()->GetContent() != child); + + // Call ContentRangeInserted with this node. + ContentRangeInserted(child, child->GetNextSibling(), aInsertionKind); + } +} + +bool nsCSSFrameConstructor::InsertionPoint::IsMultiple() const { + // Fieldset frames have multiple normal flow child frame lists so handle it + // the same as if it had multiple content insertion points. + return mParentFrame && mParentFrame->IsFieldSetFrame(); +} + +nsCSSFrameConstructor::InsertionPoint +nsCSSFrameConstructor::GetRangeInsertionPoint(nsIContent* aStartChild, + nsIContent* aEndChild, + InsertionKind aInsertionKind) { + MOZ_ASSERT(aStartChild); + MOZ_ASSERT(aStartChild->GetParent()); + + nsIContent* parent = aStartChild->GetParent(); + + // If the children of the container may be distributed to different insertion + // points, insert them separately and bail out, letting ContentInserted handle + // the mess. + if (parent->GetShadowRoot()) { + IssueSingleInsertNofications(aStartChild, aEndChild, aInsertionKind); + return {}; + } + +#ifdef DEBUG + { + nsIContent* expectedParent = aStartChild->GetFlattenedTreeParent(); + for (nsIContent* child = aStartChild->GetNextSibling(); child; + child = child->GetNextSibling()) { + MOZ_ASSERT(child->GetFlattenedTreeParent() == expectedParent); + } + } +#endif + + // Now the flattened tree parent of all the siblings is the same, just use the + // same insertion point and take the fast path, unless it's a multiple + // insertion point. + InsertionPoint ip = GetInsertionPoint(aStartChild); + if (ip.IsMultiple()) { + IssueSingleInsertNofications(aStartChild, aEndChild, aInsertionKind); + return {}; + } + + return ip; +} + +bool nsCSSFrameConstructor::MaybeRecreateForFrameset(nsIFrame* aParentFrame, + nsIContent* aStartChild, + nsIContent* aEndChild) { + if (aParentFrame->IsFrameSetFrame()) { + // Check whether we have any kids we care about. + for (nsIContent* cur = aStartChild; cur != aEndChild; + cur = cur->GetNextSibling()) { + if (IsSpecialFramesetChild(cur)) { + // Just reframe the parent, since framesets are weird like that. + RecreateFramesForContent(aParentFrame->GetContent(), + InsertionKind::Async); + return true; + } + } + } + return false; +} + +void nsCSSFrameConstructor::LazilyStyleNewChildRange(nsIContent* aStartChild, + nsIContent* aEndChild) { + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + if (child->IsElement()) { + child->AsElement()->NoteDirtyForServo(); + } + } +} + +#ifdef DEBUG +static bool IsFlattenedTreeChild(nsIContent* aParent, nsIContent* aChild) { + FlattenedChildIterator iter(aParent); + for (nsIContent* node = iter.GetNextChild(); node; + node = iter.GetNextChild()) { + if (node == aChild) { + return true; + } + } + return false; +} +#endif + +void nsCSSFrameConstructor::StyleNewChildRange(nsIContent* aStartChild, + nsIContent* aEndChild) { + ServoStyleSet* styleSet = mPresShell->StyleSet(); + + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + if (!child->IsElement()) { + continue; + } + + Element* childElement = child->AsElement(); + + // We only come in here from non-lazy frame construction, so the children + // should be unstyled. + MOZ_ASSERT(!childElement->HasServoData()); + +#ifdef DEBUG + { + // Furthermore, all of them should have the same flattened tree parent + // (GetRangeInsertionPoint ensures it). And that parent should be styled, + // otherwise we would've never found an insertion point at all. + Element* parent = childElement->GetFlattenedTreeParentElement(); + MOZ_ASSERT(parent); + MOZ_ASSERT(parent->HasServoData()); + MOZ_ASSERT( + IsFlattenedTreeChild(parent, child), + "GetFlattenedTreeParent and ChildIterator don't agree, fix this!"); + } +#endif + + styleSet->StyleNewSubtree(childElement); + } +} + +nsIFrame* nsCSSFrameConstructor::FindNextSiblingForAppend( + const InsertionPoint& aInsertion) { + auto SlowPath = [&]() -> nsIFrame* { + FlattenedChildIterator iter(aInsertion.mContainer, + /* aStartAtBeginning = */ false); + iter.GetPreviousChild(); // Prime the iterator. + Maybe<StyleDisplay> unused; + return FindNextSibling(iter, unused); + }; + + if (!IsDisplayContents(aInsertion.mContainer) && + !nsLayoutUtils::GetAfterFrame(aInsertion.mContainer)) { + MOZ_ASSERT(!SlowPath()); + return nullptr; + } + + return SlowPath(); +} + +void nsCSSFrameConstructor::ContentAppended(nsIContent* aFirstNewContent, + InsertionKind aInsertionKind) { + MOZ_ASSERT(aInsertionKind == InsertionKind::Sync || + !RestyleManager()->IsInStyleRefresh()); + + AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentAppended", + LAYOUT_FrameConstruction); + AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); + +#ifdef DEBUG + if (gNoisyContentUpdates) { + printf( + "nsCSSFrameConstructor::ContentAppended container=%p " + "first-child=%p lazy=%d\n", + aFirstNewContent->GetParent(), aFirstNewContent, + aInsertionKind == InsertionKind::Async); + if (gReallyNoisyContentUpdates && aFirstNewContent->GetParent()) { + aFirstNewContent->GetParent()->List(stdout, 0); + } + } + + for (nsIContent* child = aFirstNewContent; child; + child = child->GetNextSibling()) { + // XXX the GetContent() != child check is needed due to bug 135040. + // Remove it once that's fixed. + MOZ_ASSERT( + !child->GetPrimaryFrame() || + child->GetPrimaryFrame()->GetContent() != child, + "asked to construct a frame for a node that already has a frame"); + } +#endif + + LAYOUT_PHASE_TEMP_EXIT(); + InsertionPoint insertion = + GetRangeInsertionPoint(aFirstNewContent, nullptr, aInsertionKind); + nsContainerFrame*& parentFrame = insertion.mParentFrame; + LAYOUT_PHASE_TEMP_REENTER(); + if (!parentFrame) { + // We're punting on frame construction because there's no container frame. + // The Servo-backed style system handles this case like the lazy frame + // construction case, except when we're already constructing frames, in + // which case we shouldn't need to do anything else. + if (aInsertionKind == InsertionKind::Async) { + LazilyStyleNewChildRange(aFirstNewContent, nullptr); + } + return; + } + + if (aInsertionKind == InsertionKind::Async) { + ConstructLazily(CONTENTAPPEND, aFirstNewContent); + LazilyStyleNewChildRange(aFirstNewContent, nullptr); + return; + } + + LAYOUT_PHASE_TEMP_EXIT(); + if (MaybeRecreateForFrameset(parentFrame, aFirstNewContent, nullptr)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + if (parentFrame->IsLeaf()) { + // Nothing to do here; we shouldn't be constructing kids of leaves + // Clear lazy bits so we don't try to construct again. + ClearLazyBits(aFirstNewContent, nullptr); + return; + } + + LAYOUT_PHASE_TEMP_EXIT(); + if (WipeInsertionParent(parentFrame)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + +#ifdef DEBUG + if (gNoisyContentUpdates && IsFramePartOfIBSplit(parentFrame)) { + printf("nsCSSFrameConstructor::ContentAppended: parentFrame="); + parentFrame->ListTag(stdout); + printf(" is ib-split\n"); + } +#endif + + // We should never get here with fieldsets, since they have + // multiple insertion points. + MOZ_ASSERT(!parentFrame->IsFieldSetFrame(), + "Parent frame should not be fieldset!"); + + nsIFrame* nextSibling = FindNextSiblingForAppend(insertion); + if (nextSibling) { + parentFrame = nextSibling->GetParent()->GetContentInsertionFrame(); + } else { + parentFrame = ::ContinuationToAppendTo(parentFrame); + } + + nsContainerFrame* containingBlock = GetFloatContainingBlock(parentFrame); + + // See if the containing block has :first-letter style applied. + const bool haveFirstLetterStyle = + containingBlock && HasFirstLetterStyle(containingBlock); + + const bool haveFirstLineStyle = + containingBlock && ShouldHaveFirstLineStyle(containingBlock->GetContent(), + containingBlock->Style()); + + if (haveFirstLetterStyle) { + AutoWeakFrame wf(nextSibling); + + // Before we get going, remove the current letter frames + RemoveLetterFrames(mPresShell, containingBlock); + + // Reget nextSibling, since we may have killed it. + // + // FIXME(emilio): This kinda sucks! :( + if (nextSibling && !wf) { + nextSibling = FindNextSiblingForAppend(insertion); + if (nextSibling) { + parentFrame = nextSibling->GetParent()->GetContentInsertionFrame(); + containingBlock = GetFloatContainingBlock(parentFrame); + } + } + } + + // Create some new frames + nsFrameConstructorState state( + mPresShell, GetAbsoluteContainingBlock(parentFrame, FIXED_POS), + GetAbsoluteContainingBlock(parentFrame, ABS_POS), containingBlock); + + if (mPresShell->GetPresContext()->IsPaginated() && + StaticPrefs::layout_css_named_pages_enabled()) { + // Because this function can be called outside frame construction, we need + // to set state.mAutoPageNameValue based on what the parent frame's auto + // value is. + // Calling this from outside the frame constructor can violate many of the + // expectations in AutoFrameConstructionPageName, and unlike during frame + // construction we already have an auto value from parentFrame, so we do + // not use AutoFrameConstructionPageName here. + state.mAutoPageNameValue = parentFrame->GetAutoPageValue(); +#ifdef DEBUG + parentFrame->mWasVisitedByAutoFrameConstructionPageName = true; +#endif + } + + LayoutFrameType frameType = parentFrame->Type(); + + RefPtr<ComputedStyle> parentStyle = + ResolveComputedStyle(insertion.mContainer); + FlattenedChildIterator iter(insertion.mContainer); + const bool haveNoShadowDOM = + !iter.ShadowDOMInvolved() || !iter.GetNextChild(); + + AutoFrameConstructionItemList items(this); + if (aFirstNewContent->GetPreviousSibling() && + GetParentType(frameType) == eTypeBlock && haveNoShadowDOM) { + // If there's a text node in the normal content list just before the new + // items, and it has no frame, make a frame construction item for it. If it + // doesn't need a frame, ConstructFramesFromItemList below won't give it + // one. No need to do all this if our parent type is not block, though, + // since WipeContainingBlock already handles that situation. + // + // Because we're appending, we don't need to worry about any text + // after the appended content; there can only be generated content + // (and bare text nodes are not generated). Native anonymous content + // generated by frames never participates in inline layout. + AddTextItemIfNeeded(state, *parentStyle, insertion, + aFirstNewContent->GetPreviousSibling(), items); + } + for (nsIContent* child = aFirstNewContent; child; + child = child->GetNextSibling()) { + AddFrameConstructionItems(state, child, false, *parentStyle, insertion, + items); + } + + nsIFrame* prevSibling = ::FindAppendPrevSibling(parentFrame, nextSibling); + + // Perform special check for diddling around with the frames in + // a ib-split inline frame. + // If we're appending before :after content, then we're not really + // appending, so let WipeContainingBlock know that. + LAYOUT_PHASE_TEMP_EXIT(); + if (WipeContainingBlock(state, containingBlock, parentFrame, items, true, + prevSibling)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + // If the parent is a block frame, and we're not in a special case + // where frames can be moved around, determine if the list is for the + // start or end of the block. + if (parentFrame->IsBlockFrameOrSubclass() && !haveFirstLetterStyle && + !haveFirstLineStyle && !IsFramePartOfIBSplit(parentFrame)) { + items.SetLineBoundaryAtStart(!prevSibling || + !prevSibling->IsInlineOutside() || + prevSibling->IsBrFrame()); + // :after content can't be <br> so no need to check it + // + // FIXME(emilio): A display: contents sibling could! Write a test-case and + // fix. + items.SetLineBoundaryAtEnd(!nextSibling || !nextSibling->IsInlineOutside()); + } + // To suppress whitespace-only text frames, we have to verify that + // our container's DOM child list matches its flattened tree child list. + items.SetParentHasNoShadowDOM(haveNoShadowDOM); + + nsFrameConstructorSaveState floatSaveState; + state.MaybePushFloatContainingBlock(parentFrame, floatSaveState); + + nsFrameList frameList; + ConstructFramesFromItemList(state, items, parentFrame, + ParentIsWrapperAnonBox(parentFrame), frameList); + + for (nsIContent* child = aFirstNewContent; child; + child = child->GetNextSibling()) { + // Invalidate now instead of before the WipeContainingBlock call, just in + // case we do wipe; in that case we don't need to do this walk at all. + // XXXbz does that matter? Would it make more sense to save some virtual + // GetChildAt_Deprecated calls instead and do this during construction of + // our FrameConstructionItemList? + InvalidateCanvasIfNeeded(mPresShell, child); + } + + // If the container is a table and a caption was appended, it needs to be put + // in the table wrapper frame's additional child list. + nsFrameList captionList; + if (LayoutFrameType::Table == frameType) { + // Pull out the captions. Note that we don't want to do that as we go, + // because processing a single caption can add a whole bunch of things to + // the frame items due to pseudoframe processing. So we'd have to pull + // captions from a list anyway; might as well do that here. + // XXXbz this is no longer true; we could pull captions directly out of the + // FrameConstructionItemList now. + PullOutCaptionFrames(frameList, captionList); + } + + if (haveFirstLineStyle && parentFrame == containingBlock) { + // It's possible that some of the new frames go into a + // first-line frame. Look at them and see... + AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock, + frameList); + // That moved things into line frames as needed, reparenting their + // styles. Nothing else needs to be done. + } else if (parentFrame->Style()->HasPseudoElementData()) { + // parentFrame might be inside a ::first-line frame. Check whether it is, + // and if so fix up our styles. + CheckForFirstLineInsertion(parentFrame, frameList); + CheckForFirstLineInsertion(parentFrame, captionList); + } + + // Notify the parent frame passing it the list of new frames + // Append the flowed frames to the principal child list; captions + // need special treatment + if (captionList.NotEmpty()) { // append the caption to the table wrapper + NS_ASSERTION(LayoutFrameType::Table == frameType, "how did that happen?"); + nsContainerFrame* outerTable = parentFrame->GetParent(); + captionList.ApplySetParent(outerTable); + AppendFrames(outerTable, FrameChildListID::Caption, std::move(captionList)); + } + + LAYOUT_PHASE_TEMP_EXIT(); + if (MaybeRecreateForColumnSpan(state, parentFrame, frameList, prevSibling)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + if (frameList.NotEmpty()) { // append the in-flow kids + AppendFramesToParent(state, parentFrame, frameList, prevSibling); + } + + // Recover first-letter frames + if (haveFirstLetterStyle) { + RecoverLetterFrames(containingBlock); + } + +#ifdef DEBUG + if (gReallyNoisyContentUpdates) { + printf("nsCSSFrameConstructor::ContentAppended: resulting frame model:\n"); + parentFrame->List(stdout); + } +#endif + +#ifdef ACCESSIBILITY + if (nsAccessibilityService* accService = GetAccService()) { + accService->ContentRangeInserted(mPresShell, aFirstNewContent, nullptr); + } +#endif +} + +void nsCSSFrameConstructor::ContentInserted(nsIContent* aChild, + InsertionKind aInsertionKind) { + ContentRangeInserted(aChild, aChild->GetNextSibling(), aInsertionKind); +} + +// ContentRangeInserted handles creating frames for a range of nodes that +// aren't at the end of their childlist. ContentRangeInserted isn't a real +// content notification, but rather it handles regular ContentInserted calls +// for a single node as well as the lazy construction of frames for a range of +// nodes when called from CreateNeededFrames. For a range of nodes to be +// suitable to have its frames constructed all at once they must meet the same +// conditions that ContentAppended imposes (GetRangeInsertionPoint checks +// these), plus more. Namely when finding the insertion prevsibling we must not +// need to consult something specific to any one node in the range, so that the +// insertion prevsibling would be the same for each node in the range. So we +// pass the first node in the range to GetInsertionPrevSibling, and if +// IsValidSibling (the only place GetInsertionPrevSibling might look at the +// passed in node itself) needs to resolve style on the node we record this and +// return that this range needs to be split up and inserted separately. Table +// captions need extra attention as we need to determine where to insert them +// in the caption list, while skipping any nodes in the range being inserted +// (because when we treat the caption frames the other nodes have had their +// frames constructed but not yet inserted into the frame tree). +void nsCSSFrameConstructor::ContentRangeInserted(nsIContent* aStartChild, + nsIContent* aEndChild, + InsertionKind aInsertionKind) { + MOZ_ASSERT(aInsertionKind == InsertionKind::Sync || + !RestyleManager()->IsInStyleRefresh()); + + AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRangeInserted", + LAYOUT_FrameConstruction); + AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); + + MOZ_ASSERT(aStartChild, "must always pass a child"); + +#ifdef DEBUG + if (gNoisyContentUpdates) { + printf( + "nsCSSFrameConstructor::ContentRangeInserted container=%p " + "start-child=%p end-child=%p lazy=%d\n", + aStartChild->GetParent(), aStartChild, aEndChild, + aInsertionKind == InsertionKind::Async); + if (gReallyNoisyContentUpdates) { + if (aStartChild->GetParent()) { + aStartChild->GetParent()->List(stdout, 0); + } else { + aStartChild->List(stdout, 0); + } + } + } + + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + // XXX the GetContent() != child check is needed due to bug 135040. + // Remove it once that's fixed. + NS_ASSERTION( + !child->GetPrimaryFrame() || + child->GetPrimaryFrame()->GetContent() != child, + "asked to construct a frame for a node that already has a frame"); + } +#endif + + bool isSingleInsert = (aStartChild->GetNextSibling() == aEndChild); + NS_ASSERTION(isSingleInsert || aInsertionKind == InsertionKind::Sync, + "range insert shouldn't be lazy"); + NS_ASSERTION(isSingleInsert || aEndChild, + "range should not include all nodes after aStartChild"); + + // If we have a null parent, then this must be the document element being + // inserted, or some other child of the document in the DOM (might be a PI, + // say). + if (!aStartChild->GetParent()) { + MOZ_ASSERT(isSingleInsert, + "root node insertion should be a single insertion"); + Element* docElement = mDocument->GetRootElement(); + + if (aStartChild != docElement) { + // Not the root element; just bail out + return; + } + + MOZ_ASSERT(!mRootElementFrame, "root element frame already created"); + + // Create frames for the document element and its child elements + if (ConstructDocElementFrame(docElement)) { + InvalidateCanvasIfNeeded(mPresShell, aStartChild); +#ifdef DEBUG + if (gReallyNoisyContentUpdates) { + printf( + "nsCSSFrameConstructor::ContentRangeInserted: resulting frame " + "model:\n"); + mRootElementFrame->List(stdout); + } +#endif + } + +#ifdef ACCESSIBILITY + if (nsAccessibilityService* accService = GetAccService()) { + accService->ContentRangeInserted(mPresShell, aStartChild, aEndChild); + } +#endif + + return; + } + + InsertionPoint insertion; + if (isSingleInsert) { + // See if we have a Shadow DOM insertion point. If so, then that's our real + // parent frame; if not, then the frame hasn't been built yet and we just + // bail. + insertion = GetInsertionPoint(aStartChild); + } else { + // Get our insertion point. If we need to issue single ContentInserteds + // GetRangeInsertionPoint will take care of that for us. + LAYOUT_PHASE_TEMP_EXIT(); + insertion = GetRangeInsertionPoint(aStartChild, aEndChild, aInsertionKind); + LAYOUT_PHASE_TEMP_REENTER(); + } + + if (!insertion.mParentFrame) { + // We're punting on frame construction because there's no container frame. + // The Servo-backed style system handles this case like the lazy frame + // construction case, except when we're already constructing frames, in + // which case we shouldn't need to do anything else. + if (aInsertionKind == InsertionKind::Async) { + LazilyStyleNewChildRange(aStartChild, aEndChild); + } + return; + } + + if (aInsertionKind == InsertionKind::Async) { + ConstructLazily(CONTENTINSERT, aStartChild); + LazilyStyleNewChildRange(aStartChild, aEndChild); + return; + } + + bool isAppend, isRangeInsertSafe; + nsIFrame* prevSibling = GetInsertionPrevSibling( + &insertion, aStartChild, &isAppend, &isRangeInsertSafe); + + // check if range insert is safe + if (!isSingleInsert && !isRangeInsertSafe) { + // must fall back to a single ContertInserted for each child in the range + LAYOUT_PHASE_TEMP_EXIT(); + IssueSingleInsertNofications(aStartChild, aEndChild, InsertionKind::Sync); + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + + LayoutFrameType frameType = insertion.mParentFrame->Type(); + LAYOUT_PHASE_TEMP_EXIT(); + if (MaybeRecreateForFrameset(insertion.mParentFrame, aStartChild, + aEndChild)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + // We should only get here with fieldsets when doing a single insert, because + // fieldsets have multiple insertion points. + NS_ASSERTION(isSingleInsert || frameType != LayoutFrameType::FieldSet, + "Unexpected parent"); + // Note that this check is insufficient if aStartChild is not a legend with + // display::contents that contains a legend. We'll catch that case in + // WipeContainingBlock. (That code would also catch this case, but handling + // this early is slightly faster.) + // XXXmats we should be able to optimize this when the fieldset doesn't + // currently have a rendered legend. ContentRangeInserted needs to be fixed + // to use the inner frame as the content insertion frame in that case. + if (GetFieldSetFrameFor(insertion.mParentFrame) && + aStartChild->NodeInfo()->NameAtom() == nsGkAtoms::legend) { + // Just reframe the parent, since figuring out whether this + // should be the new legend and then handling it is too complex. + // We could do a little better here --- check if the fieldset already + // has a legend which occurs earlier in its child list than this node, + // and if so, proceed. But we'd have to extend nsFieldSetFrame + // to locate this legend in the inserted frames and extract it. + LAYOUT_PHASE_TEMP_EXIT(); + RecreateFramesForContent(insertion.mParentFrame->GetContent(), + InsertionKind::Async); + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + + // Don't construct kids of leaves + if (insertion.mParentFrame->IsLeaf()) { + // Clear lazy bits so we don't try to construct again. + ClearLazyBits(aStartChild, aEndChild); + return; + } + + LAYOUT_PHASE_TEMP_EXIT(); + if (WipeInsertionParent(insertion.mParentFrame)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + nsFrameConstructorState state( + mPresShell, GetAbsoluteContainingBlock(insertion.mParentFrame, FIXED_POS), + GetAbsoluteContainingBlock(insertion.mParentFrame, ABS_POS), + GetFloatContainingBlock(insertion.mParentFrame), + do_AddRef(mFrameTreeState)); + + // Recover state for the containing block - we need to know if + // it has :first-letter or :first-line style applied to it. The + // reason we care is that the internal structure in these cases + // is not the normal structure and requires custom updating + // logic. + nsContainerFrame* containingBlock = state.mFloatedList.mContainingBlock; + bool haveFirstLetterStyle = false; + bool haveFirstLineStyle = false; + + // In order to shave off some cycles, we only dig up the + // containing block haveFirst* flags if the parent frame where + // the insertion/append is occurring is an inline or block + // container. For other types of containers this isn't relevant. + StyleDisplayInside parentDisplayInside = + insertion.mParentFrame->StyleDisplay()->DisplayInside(); + + // Examine the insertion.mParentFrame where the insertion is taking + // place. If it's a certain kind of container then some special + // processing is done. + if (StyleDisplayInside::Flow == parentDisplayInside) { + // Recover the special style flags for the containing block + if (containingBlock) { + haveFirstLetterStyle = HasFirstLetterStyle(containingBlock); + haveFirstLineStyle = ShouldHaveFirstLineStyle( + containingBlock->GetContent(), containingBlock->Style()); + } + + if (haveFirstLetterStyle) { + // If our current insertion.mParentFrame is a Letter frame, use its parent + // as our new parent hint + if (insertion.mParentFrame->IsLetterFrame()) { + // If insertion.mParentFrame is out of flow, then we actually want the + // parent of the placeholder frame. + if (insertion.mParentFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) { + nsPlaceholderFrame* placeholderFrame = + insertion.mParentFrame->GetPlaceholderFrame(); + NS_ASSERTION(placeholderFrame, "No placeholder for out-of-flow?"); + insertion.mParentFrame = placeholderFrame->GetParent(); + } else { + insertion.mParentFrame = insertion.mParentFrame->GetParent(); + } + } + + // Remove the old letter frames before doing the insertion + RemoveLetterFrames(mPresShell, state.mFloatedList.mContainingBlock); + + // Removing the letterframes messes around with the frame tree, removing + // and creating frames. We need to reget our prevsibling, parent frame, + // etc. + prevSibling = GetInsertionPrevSibling(&insertion, aStartChild, &isAppend, + &isRangeInsertSafe); + + // Need check whether a range insert is still safe. + if (!isSingleInsert && !isRangeInsertSafe) { + // Need to recover the letter frames first. + RecoverLetterFrames(state.mFloatedList.mContainingBlock); + + // must fall back to a single ContertInserted for each child in the + // range + LAYOUT_PHASE_TEMP_EXIT(); + IssueSingleInsertNofications(aStartChild, aEndChild, + InsertionKind::Sync); + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + + frameType = insertion.mParentFrame->Type(); + } + } + + // This handles fallback to 'list-style-type' when a 'list-style-image' fails + // to load. + if (aStartChild->IsInNativeAnonymousSubtree() && + aStartChild->IsHTMLElement(nsGkAtoms::mozgeneratedcontentimage)) { + MOZ_ASSERT(isSingleInsert); + MOZ_ASSERT(insertion.mParentFrame->Style()->GetPseudoType() == + PseudoStyleType::marker, + "we can only handle ::marker fallback for now"); + nsIContent* const nextSibling = aStartChild->GetNextSibling(); + MOZ_ASSERT(nextSibling && nextSibling->IsText(), + "expected a text node after the list-style-image image"); + RemoveFrame(FrameChildListID::Principal, nextSibling->GetPrimaryFrame()); + auto* const container = aStartChild->GetParent()->AsElement(); + nsIContent* firstNewChild = nullptr; + auto InsertChild = [this, container, nextSibling, + &firstNewChild](RefPtr<nsIContent>&& aChild) { + // We don't strictly have to set NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE + // here; it would get set under AppendChildTo. But AppendChildTo might + // think that we're going from not being anonymous to being anonymous and + // do some extra work; setting the flag here avoids that. + aChild->SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE); + container->InsertChildBefore(aChild, nextSibling, false, IgnoreErrors()); + if (auto* childElement = Element::FromNode(aChild)) { + // If we created any children elements, Servo needs to traverse them, + // but the root is already set up. + mPresShell->StyleSet()->StyleNewSubtree(childElement); + } + if (!firstNewChild) { + firstNewChild = aChild; + } + }; + CreateGeneratedContentFromListStyleType( + state, *insertion.mContainer->AsElement(), + *insertion.mParentFrame->Style(), InsertChild); + if (!firstNewChild) { + // No fallback content - we're done. + return; + } + aStartChild = firstNewChild; + MOZ_ASSERT(firstNewChild->GetNextSibling() == nextSibling, + "list-style-type should only create one child"); + } + + AutoFrameConstructionItemList items(this); + RefPtr<ComputedStyle> parentStyle = + ResolveComputedStyle(insertion.mContainer); + ParentType parentType = GetParentType(frameType); + FlattenedChildIterator iter(insertion.mContainer); + const bool haveNoShadowDOM = + !iter.ShadowDOMInvolved() || !iter.GetNextChild(); + if (aStartChild->GetPreviousSibling() && parentType == eTypeBlock && + haveNoShadowDOM) { + // If there's a text node in the normal content list just before the + // new nodes, and it has no frame, make a frame construction item for + // it, because it might need a frame now. No need to do this if our + // parent type is not block, though, since WipeContainingBlock + // already handles that situation. + AddTextItemIfNeeded(state, *parentStyle, insertion, + aStartChild->GetPreviousSibling(), items); + } + + if (isSingleInsert) { + AddFrameConstructionItems(state, aStartChild, + aStartChild->IsRootOfNativeAnonymousSubtree(), + *parentStyle, insertion, items); + } else { + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + AddFrameConstructionItems(state, child, false, *parentStyle, insertion, + items); + } + } + + if (aEndChild && parentType == eTypeBlock && haveNoShadowDOM) { + // If there's a text node in the normal content list just after the + // new nodes, and it has no frame, make a frame construction item for + // it, because it might need a frame now. No need to do this if our + // parent type is not block, though, since WipeContainingBlock + // already handles that situation. + AddTextItemIfNeeded(state, *parentStyle, insertion, aEndChild, items); + } + + // Perform special check for diddling around with the frames in + // a special inline frame. + // If we're appending before :after content, then we're not really + // appending, so let WipeContainingBlock know that. + LAYOUT_PHASE_TEMP_EXIT(); + if (WipeContainingBlock(state, containingBlock, insertion.mParentFrame, items, + isAppend, prevSibling)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + nsFrameConstructorSaveState floatSaveState; + state.MaybePushFloatContainingBlock(insertion.mParentFrame, floatSaveState); + + if (state.mPresContext->IsPaginated() && + StaticPrefs::layout_css_named_pages_enabled()) { + // Because this function can be called outside frame construction, we need + // to set state.mAutoPageNameValue based on what the parent frame's auto + // value is. + // Calling this from outside the frame constructor can violate many of the + // expectations in AutoFrameConstructionPageName, and unlike during frame + // construction we already have an auto value from parentFrame, so we do + // not use AutoFrameConstructionPageName here. + state.mAutoPageNameValue = insertion.mParentFrame->GetAutoPageValue(); +#ifdef DEBUG + insertion.mParentFrame->mWasVisitedByAutoFrameConstructionPageName = true; +#endif + } + + // If the container is a table and a caption will be appended, it needs to be + // put in the table wrapper frame's additional child list. + // We make no attempt here to set flags to indicate whether the list + // will be at the start or end of a block. It doesn't seem worthwhile. + nsFrameList frameList, captionList; + ConstructFramesFromItemList(state, items, insertion.mParentFrame, + ParentIsWrapperAnonBox(insertion.mParentFrame), + frameList); + + if (frameList.NotEmpty()) { + for (nsIContent* child = aStartChild; child != aEndChild; + child = child->GetNextSibling()) { + InvalidateCanvasIfNeeded(mPresShell, child); + } + + if (LayoutFrameType::Table == frameType || + LayoutFrameType::TableWrapper == frameType) { + PullOutCaptionFrames(frameList, captionList); + } + } + + if (haveFirstLineStyle && insertion.mParentFrame == containingBlock && + isAppend) { + // It's possible that the new frame goes into a first-line + // frame. Look at it and see... + AppendFirstLineFrames(state, containingBlock->GetContent(), containingBlock, + frameList); + } else if (insertion.mParentFrame->Style()->HasPseudoElementData()) { + CheckForFirstLineInsertion(insertion.mParentFrame, frameList); + CheckForFirstLineInsertion(insertion.mParentFrame, captionList); + } + + // We might have captions; put them into the caption list of the + // table wrapper frame. + if (captionList.NotEmpty()) { + NS_ASSERTION(LayoutFrameType::Table == frameType || + LayoutFrameType::TableWrapper == frameType, + "parent for caption is not table?"); + // We need to determine where to put the caption items; start with the + // the parent frame that has already been determined and get the insertion + // prevsibling of the first caption item. + bool captionIsAppend; + nsIFrame* captionPrevSibling = nullptr; + + // aIsRangeInsertSafe is ignored on purpose because it is irrelevant here. + bool ignored; + InsertionPoint captionInsertion = insertion; + if (isSingleInsert) { + captionPrevSibling = GetInsertionPrevSibling( + &captionInsertion, aStartChild, &captionIsAppend, &ignored); + } else { + nsIContent* firstCaption = captionList.FirstChild()->GetContent(); + // It is very important here that we skip the children in + // [aStartChild,aEndChild) when looking for a + // prevsibling. + captionPrevSibling = GetInsertionPrevSibling( + &captionInsertion, firstCaption, &captionIsAppend, &ignored, + aStartChild, aEndChild); + } + + nsContainerFrame* outerTable = + captionInsertion.mParentFrame->IsTableFrame() + ? captionInsertion.mParentFrame->GetParent() + : captionInsertion.mParentFrame; + + // If the parent is not a table wrapper frame we will try to add frames + // to a named child list that the parent does not honor and the frames + // will get lost. + MOZ_ASSERT(outerTable->IsTableWrapperFrame(), + "Pseudo frame construction failure; " + "a caption can be only a child of a table wrapper frame"); + + // If the parent of our current prevSibling is different from the frame + // we'll actually use as the parent, then the calculated insertion + // point is now invalid (bug 341382). + if (captionPrevSibling && captionPrevSibling->GetParent() != outerTable) { + captionPrevSibling = nullptr; + } + + captionList.ApplySetParent(outerTable); + if (captionIsAppend) { + AppendFrames(outerTable, FrameChildListID::Caption, + std::move(captionList)); + } else { + InsertFrames(outerTable, FrameChildListID::Caption, captionPrevSibling, + std::move(captionList)); + } + } + + LAYOUT_PHASE_TEMP_EXIT(); + if (MaybeRecreateForColumnSpan(state, insertion.mParentFrame, frameList, + prevSibling)) { + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + LAYOUT_PHASE_TEMP_REENTER(); + + if (frameList.NotEmpty()) { + // Notify the parent frame + if (isAppend) { + AppendFramesToParent(state, insertion.mParentFrame, frameList, + prevSibling); + } else { + InsertFrames(insertion.mParentFrame, FrameChildListID::Principal, + prevSibling, std::move(frameList)); + } + } + + if (haveFirstLetterStyle) { + // Recover the letter frames for the containing block when + // it has first-letter style. + RecoverLetterFrames(state.mFloatedList.mContainingBlock); + } + +#ifdef DEBUG + if (gReallyNoisyContentUpdates && insertion.mParentFrame) { + printf( + "nsCSSFrameConstructor::ContentRangeInserted: resulting frame " + "model:\n"); + insertion.mParentFrame->List(stdout); + } +#endif + +#ifdef ACCESSIBILITY + if (nsAccessibilityService* accService = GetAccService()) { + accService->ContentRangeInserted(mPresShell, aStartChild, aEndChild); + } +#endif +} + +bool nsCSSFrameConstructor::ContentRemoved(nsIContent* aChild, + nsIContent* aOldNextSibling, + RemoveFlags aFlags) { + MOZ_ASSERT(aChild); + MOZ_ASSERT(!aChild->IsRootOfNativeAnonymousSubtree() || !aOldNextSibling, + "Anonymous roots don't have siblings"); + AUTO_PROFILER_LABEL("nsCSSFrameConstructor::ContentRemoved", + LAYOUT_FrameConstruction); + AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); + nsPresContext* presContext = mPresShell->GetPresContext(); + MOZ_ASSERT(presContext, "Our presShell should have a valid presContext"); + + // We want to detect when the viewport override element stored in the + // prescontext is in the subtree being removed. Except in fullscreen cases + // (which are handled in Element::UnbindFromTree and do not get stored on the + // prescontext), the override element is always either the root element or a + // <body> child of the root element. So we can only be removing the stored + // override element if the thing being removed is either the override element + // itself or the root element (which can be a parent of the override element). + if (aChild == presContext->GetViewportScrollStylesOverrideElement() || + (aChild->IsElement() && !aChild->GetParent())) { + // We might be removing the element that we propagated viewport scrollbar + // styles from. Recompute those. (This clause covers two of the three + // possible scrollbar-propagation sources: the <body> [as aChild or a + // descendant] and the root node. The other possible scrollbar-propagation + // source is a fullscreen element, and we have code elsewhere to update + // scrollbars after fullscreen elements are removed -- specifically, it's + // part of the fullscreen cleanup code called by Element::UnbindFromTree. + // We don't handle the fullscreen case here, because it doesn't change the + // scrollbar styles override element stored on the prescontext.) + Element* newOverrideElement = + presContext->UpdateViewportScrollStylesOverride(); + + // If aChild is the root, then we don't need to do any reframing of + // newOverrideElement, because we're about to tear down the whole frame tree + // anyway. And we need to make sure we don't do any such reframing, because + // reframing the <body> can trigger a reframe of the <html> and then reenter + // here. + // + // But if aChild is not the root, and if newOverrideElement is not + // the root and isn't aChild (which it could be if all we're doing + // here is reframing the current override element), it needs + // reframing. In particular, it used to have a scrollframe + // (because its overflow was not "visible"), but now it will + // propagate its overflow to the viewport, so it should not need a + // scrollframe anymore. + if (aChild->GetParent() && newOverrideElement && + newOverrideElement->GetParent() && newOverrideElement != aChild) { + LAYOUT_PHASE_TEMP_EXIT(); + RecreateFramesForContent(newOverrideElement, InsertionKind::Async); + LAYOUT_PHASE_TEMP_REENTER(); + } + } + +#ifdef DEBUG + if (gNoisyContentUpdates) { + printf( + "nsCSSFrameConstructor::ContentRemoved container=%p child=%p " + "old-next-sibling=%p\n", + aChild->GetParent(), aChild, aOldNextSibling); + if (gReallyNoisyContentUpdates) { + aChild->GetParent()->List(stdout, 0); + } + } +#endif + + nsIFrame* childFrame = aChild->GetPrimaryFrame(); + if (!childFrame || childFrame->GetContent() != aChild) { + // XXXbz the GetContent() != aChild check is needed due to bug 135040. + // Remove it once that's fixed. + childFrame = nullptr; + } + + // If we're removing the root, then make sure to remove things starting at + // the viewport's child instead of the primary frame (which might even be + // null if the root was display:none, even though the frames above it got + // created). Detecting removal of a root is a little exciting; in particular, + // having no parent is necessary but NOT sufficient. + // + // Due to how we process reframes, the content node might not even be in our + // document by now. So explicitly check whether the viewport's first kid's + // content node is aChild. + // + // FIXME(emilio): I think the "might not be in our document" bit is impossible + // now. + bool isRoot = false; + if (!aChild->GetParent()) { + if (nsIFrame* viewport = GetRootFrame()) { + nsIFrame* firstChild = viewport->PrincipalChildList().FirstChild(); + if (firstChild && firstChild->GetContent() == aChild) { + isRoot = true; + childFrame = firstChild; + NS_ASSERTION(!childFrame->GetNextSibling(), "How did that happen?"); + } + } + } + + // We need to be conservative about when to determine whether something has + // display: contents or not because at this point our actual display may be + // different. + // + // Consider the case of: + // + // <div id="A" style="display: contents"><div id="B"></div></div> + // + // If we reconstruct A because its display changed to "none", we still need to + // cleanup the frame on B, but A's display is now "none", so we can't poke at + // the style of it. + // + // FIXME(emilio, bug 1450366): We can make this faster without adding much + // complexity for the display: none -> other case, which right now + // unnecessarily walks the content tree down. + auto CouldHaveBeenDisplayContents = [aFlags](nsIContent* aContent) -> bool { + return aFlags == REMOVE_FOR_RECONSTRUCTION || IsDisplayContents(aContent); + }; + + if (!childFrame && CouldHaveBeenDisplayContents(aChild)) { + // NOTE(emilio): We may iterate through ::before and ::after here and they + // may be gone after the respective ContentRemoved call. Right now + // StyleChildrenIterator handles that properly, so it's not an issue. + StyleChildrenIterator iter(aChild); + for (nsIContent* c = iter.GetNextChild(); c; c = iter.GetNextChild()) { + if (c->GetPrimaryFrame() || CouldHaveBeenDisplayContents(c)) { + LAYOUT_PHASE_TEMP_EXIT(); + bool didReconstruct = ContentRemoved(c, nullptr, aFlags); + LAYOUT_PHASE_TEMP_REENTER(); + if (didReconstruct) { + return true; + } + } + } + return false; + } + + if (childFrame) { + if (aFlags == REMOVE_FOR_RECONSTRUCTION) { + // Before removing the frames associated with the content object, + // ask them to save their state onto our state object. + CaptureStateForFramesOf(aChild, mFrameTreeState); + } + + InvalidateCanvasIfNeeded(mPresShell, aChild); + + // See whether we need to remove more than just childFrame + LAYOUT_PHASE_TEMP_EXIT(); + if (MaybeRecreateContainerForFrameRemoval(childFrame)) { + LAYOUT_PHASE_TEMP_REENTER(); + return true; + } + LAYOUT_PHASE_TEMP_REENTER(); + + // Get the childFrame's parent frame + nsIFrame* parentFrame = childFrame->GetParent(); + LayoutFrameType parentType = parentFrame->Type(); + + if (parentType == LayoutFrameType::FrameSet && + IsSpecialFramesetChild(aChild)) { + // Just reframe the parent, since framesets are weird like that. + LAYOUT_PHASE_TEMP_EXIT(); + RecreateFramesForContent(parentFrame->GetContent(), InsertionKind::Async); + LAYOUT_PHASE_TEMP_REENTER(); + return true; + } + + // If we're a child of MathML, then we should reframe the MathML content. + // If we're non-MathML, then we would be wrapped in a block so we need to + // check our grandparent in that case. + nsIFrame* possibleMathMLAncestor = parentType == LayoutFrameType::Block + ? parentFrame->GetParent() + : parentFrame; + if (possibleMathMLAncestor->IsFrameOfType(nsIFrame::eMathML)) { + LAYOUT_PHASE_TEMP_EXIT(); + RecreateFramesForContent(parentFrame->GetContent(), InsertionKind::Async); + LAYOUT_PHASE_TEMP_REENTER(); + return true; + } + +#ifdef ACCESSIBILITY + if (aFlags != REMOVE_FOR_RECONSTRUCTION) { + if (nsAccessibilityService* accService = GetAccService()) { + accService->ContentRemoved(mPresShell, aChild); + } + } +#endif + + // Examine the containing-block for the removed content and see if + // :first-letter style applies. + nsIFrame* inflowChild = childFrame; + if (childFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) { + inflowChild = childFrame->GetPlaceholderFrame(); + NS_ASSERTION(inflowChild, "No placeholder for out-of-flow?"); + } + nsContainerFrame* containingBlock = + GetFloatContainingBlock(inflowChild->GetParent()); + bool haveFLS = containingBlock && HasFirstLetterStyle(containingBlock); + if (haveFLS) { + // Trap out to special routine that handles adjusting a blocks + // frame tree when first-letter style is present. +#ifdef NOISY_FIRST_LETTER + printf("ContentRemoved: containingBlock="); + containingBlock->ListTag(stdout); + printf(" parentFrame="); + parentFrame->ListTag(stdout); + printf(" childFrame="); + childFrame->ListTag(stdout); + printf("\n"); +#endif + + // First update the containing blocks structure by removing the + // existing letter frames. This makes the subsequent logic + // simpler. + RemoveLetterFrames(mPresShell, containingBlock); + + // Recover childFrame and parentFrame + childFrame = aChild->GetPrimaryFrame(); + if (!childFrame || childFrame->GetContent() != aChild) { + // XXXbz the GetContent() != aChild check is needed due to bug 135040. + // Remove it once that's fixed. + return false; + } + parentFrame = childFrame->GetParent(); + parentType = parentFrame->Type(); + +#ifdef NOISY_FIRST_LETTER + printf(" ==> revised parentFrame="); + parentFrame->ListTag(stdout); + printf(" childFrame="); + childFrame->ListTag(stdout); + printf("\n"); +#endif + } + +#ifdef DEBUG + if (gReallyNoisyContentUpdates) { + printf("nsCSSFrameConstructor::ContentRemoved: childFrame="); + childFrame->ListTag(stdout); + putchar('\n'); + parentFrame->List(stdout); + } +#endif + + // Notify the parent frame that it should delete the frame + if (childFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) { + childFrame = childFrame->GetPlaceholderFrame(); + NS_ASSERTION(childFrame, "Missing placeholder frame for out of flow."); + parentFrame = childFrame->GetParent(); + } + + RemoveFrame(nsLayoutUtils::GetChildListNameFor(childFrame), childFrame); + + // NOTE(emilio): aChild could be dead here already if it is a ::before or + // ::after pseudo-element (since in that case it was owned by childFrame, + // which we just destroyed). + + if (isRoot) { + mRootElementFrame = nullptr; + mRootElementStyleFrame = nullptr; + mDocElementContainingBlock = nullptr; + mPageSequenceFrame = nullptr; + } + + if (haveFLS && mRootElementFrame) { + RecoverLetterFrames(containingBlock); + } + + // If we're just reconstructing frames for the element, then the + // following ContentInserted notification on the element will + // take care of fixing up any adjacent text nodes. We don't need + // to do this if the table parent type of our parent type is not + // eTypeBlock, though, because in that case the whitespace isn't + // being suppressed due to us anyway. + if (aOldNextSibling && aFlags == REMOVE_CONTENT && + GetParentType(parentType) == eTypeBlock) { + MOZ_ASSERT(aChild->GetParentNode(), + "How did we have a sibling without a parent?"); + // Adjacent whitespace-only text nodes might have been suppressed if + // this node does not have inline ends. Create frames for them now + // if necessary. + // Reframe any text node just before the node being removed, if there is + // one, and if it's not the last child or the first child. If a whitespace + // textframe was being suppressed and it's now the last child or first + // child then it can stay suppressed since the parent must be a block + // and hence it's adjacent to a block end. + // If aOldNextSibling is null, then the text node before the node being + // removed is the last node, and we don't need to worry about it. + // + // FIXME(emilio): This should probably use the lazy frame construction + // bits if possible instead of reframing it in place. + nsIContent* prevSibling = aOldNextSibling->GetPreviousSibling(); + if (prevSibling && prevSibling->GetPreviousSibling()) { + LAYOUT_PHASE_TEMP_EXIT(); + ReframeTextIfNeeded(prevSibling); + LAYOUT_PHASE_TEMP_REENTER(); + } + // Reframe any text node just after the node being removed, if there is + // one, and if it's not the last child or the first child. + if (aOldNextSibling->GetNextSibling() && + aOldNextSibling->GetPreviousSibling()) { + LAYOUT_PHASE_TEMP_EXIT(); + ReframeTextIfNeeded(aOldNextSibling); + LAYOUT_PHASE_TEMP_REENTER(); + } + } + +#ifdef DEBUG + if (gReallyNoisyContentUpdates && parentFrame) { + printf("nsCSSFrameConstructor::ContentRemoved: resulting frame model:\n"); + parentFrame->List(stdout); + } +#endif + } + + return false; +} + +/** + * This method invalidates the canvas when frames are removed or added for a + * node that might have its background propagated to the canvas, i.e., a + * document root node or an HTML BODY which is a child of the root node. + * + * @param aFrame a frame for a content node about to be removed or a frame that + * was just created for a content node that was inserted. + */ +static void InvalidateCanvasIfNeeded(PresShell* aPresShell, nsIContent* aNode) { + MOZ_ASSERT(aPresShell->GetRootFrame(), "What happened here?"); + MOZ_ASSERT(aPresShell->GetPresContext(), "Say what?"); + + // Note that both in ContentRemoved and ContentInserted the content node + // will still have the right parent pointer, so looking at that is ok. + + nsIContent* parent = aNode->GetParent(); + if (parent) { + // Has a parent; might not be what we want + nsIContent* grandParent = parent->GetParent(); + if (grandParent) { + // Has a grandparent, so not what we want + return; + } + + // Check whether it's an HTML body + if (!aNode->IsHTMLElement(nsGkAtoms::body)) { + return; + } + } + + // At this point the node has no parent or it's an HTML <body> child of the + // root. We might not need to invalidate in this case (eg we might be in + // XHTML or something), but chances are we want to. Play it safe. + // Invalidate the viewport. + + nsIFrame* rootFrame = aPresShell->GetRootFrame(); + rootFrame->InvalidateFrameSubtree(); +} + +bool nsCSSFrameConstructor::EnsureFrameForTextNodeIsCreatedAfterFlush( + CharacterData* aContent) { + if (!aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE)) { + return false; + } + + if (mAlwaysCreateFramesForIgnorableWhitespace) { + return false; + } + + // Text frame may have been suppressed. Disable suppression and signal that a + // flush should be performed. We do this on a document-wide basis so that + // pages that repeatedly query metrics for collapsed-whitespace text nodes + // don't trigger pathological behavior. + mAlwaysCreateFramesForIgnorableWhitespace = true; + Element* root = mDocument->GetRootElement(); + if (!root) { + return false; + } + + RestyleManager()->PostRestyleEvent(root, RestyleHint{0}, + nsChangeHint_ReconstructFrame); + return true; +} + +void nsCSSFrameConstructor::CharacterDataChanged( + nsIContent* aContent, const CharacterDataChangeInfo& aInfo) { + AUTO_PROFILER_LABEL("nsCSSFrameConstructor::CharacterDataChanged", + LAYOUT_FrameConstruction); + AUTO_LAYOUT_PHASE_ENTRY_POINT(mPresShell->GetPresContext(), FrameC); + + if ((aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE) && + !aContent->TextIsOnlyWhitespace()) || + (aContent->HasFlag(NS_REFRAME_IF_WHITESPACE) && + aContent->TextIsOnlyWhitespace())) { +#ifdef DEBUG + nsIFrame* frame = aContent->GetPrimaryFrame(); + NS_ASSERTION(!frame || !frame->IsGeneratedContentFrame(), + "Bit should never be set on generated content"); +#endif + LAYOUT_PHASE_TEMP_EXIT(); + RecreateFramesForContent(aContent, InsertionKind::Async); + LAYOUT_PHASE_TEMP_REENTER(); + return; + } + + // It's possible the frame whose content changed isn't inserted into the + // frame hierarchy yet, or that there is no frame that maps the content + if (nsIFrame* frame = aContent->GetPrimaryFrame()) { +#if 0 + NS_FRAME_LOG(NS_FRAME_TRACE_CALLS, + ("nsCSSFrameConstructor::CharacterDataChanged: content=%p[%s] subcontent=%p frame=%p", + aContent, ContentTag(aContent, 0), + aSubContent, frame)); +#endif + + // Special check for text content that is a child of a letter frame. If + // this happens, we should remove the letter frame, do whatever we're + // planning to do with this notification, then put the letter frame back. + // Note that this is basically what RecreateFramesForContent ends up doing; + // the reason we dont' want to call that here is that our text content + // could be native anonymous, in which case RecreateFramesForContent would + // completely barf on it. And recreating the non-anonymous ancestor would + // just lead us to come back into this notification (e.g. if quotes or + // counters are involved), leading to a loop. + nsContainerFrame* block = GetFloatContainingBlock(frame); + bool haveFirstLetterStyle = false; + if (block) { + // See if the block has first-letter style applied to it. + haveFirstLetterStyle = HasFirstLetterStyle(block); + if (haveFirstLetterStyle) { + RemoveLetterFrames(mPresShell, block); + // Reget |frame|, since we might have killed it. + // Do we really need to call CharacterDataChanged in this case, though? + frame = aContent->GetPrimaryFrame(); + NS_ASSERTION(frame, "Should have frame here!"); + } + } + + // Notify the first frame that maps the content. It will generate a reflow + // command + frame->CharacterDataChanged(aInfo); + + if (haveFirstLetterStyle) { + RecoverLetterFrames(block); + } + } +} + +void nsCSSFrameConstructor::RecalcQuotesAndCounters() { + nsAutoScriptBlocker scriptBlocker; + + if (mQuotesDirty) { + mQuotesDirty = false; + mContainStyleScopeManager.RecalcAllQuotes(); + } + + if (mCountersDirty) { + mCountersDirty = false; + mContainStyleScopeManager.RecalcAllCounters(); + } + + NS_ASSERTION(!mQuotesDirty, "Quotes updates will be lost"); + NS_ASSERTION(!mCountersDirty, "Counter updates will be lost"); +} + +void nsCSSFrameConstructor::NotifyCounterStylesAreDirty() { + mContainStyleScopeManager.SetAllCountersDirty(); + CountersDirty(); +} + +void nsCSSFrameConstructor::WillDestroyFrameTree() { +#if defined(DEBUG_dbaron_off) + mContainStyleScopeManager.DumpCounters(); +#endif + + // Prevent frame tree destruction from being O(N^2) + mContainStyleScopeManager.Clear(); + nsFrameManager::Destroy(); +} + +// STATIC + +// XXXbz I'd really like this method to go away. Once we have inline-block and +// I can just use that for sized broken images, that can happen, maybe. +// +// NOTE(emilio): This needs to match MozAltContent handling. +void nsCSSFrameConstructor::GetAlternateTextFor(const Element& aElement, + nsAString& aAltText) { + // The "alt" attribute specifies alternate text that is rendered + // when the image can not be displayed. + if (aElement.GetAttr(nsGkAtoms::alt, aAltText)) { + return; + } + + if (aElement.IsHTMLElement(nsGkAtoms::input)) { + // If there's no "alt" attribute, and aElement is an input element, then use + // the value of the "value" attribute. + if (aElement.GetAttr(nsGkAtoms::value, aAltText)) { + return; + } + + // If there's no "value" attribute either, then use the localized string for + // "Submit" as the alternate text. + nsContentUtils::GetMaybeLocalizedString(nsContentUtils::eFORMS_PROPERTIES, + "Submit", aElement.OwnerDoc(), + aAltText); + } +} + +nsIFrame* nsCSSFrameConstructor::CreateContinuingOuterTableFrame( + nsIFrame* aFrame, nsContainerFrame* aParentFrame, nsIContent* aContent, + ComputedStyle* aComputedStyle) { + nsTableWrapperFrame* newFrame = + NS_NewTableWrapperFrame(mPresShell, aComputedStyle); + + newFrame->Init(aContent, aParentFrame, aFrame); + + // Create a continuing inner table frame, and if there's a caption then + // replicate the caption + nsFrameList newChildFrames; + + nsIFrame* childFrame = aFrame->PrincipalChildList().FirstChild(); + if (childFrame) { + nsIFrame* continuingTableFrame = + CreateContinuingFrame(childFrame, newFrame); + newChildFrames.AppendFrame(nullptr, continuingTableFrame); + + NS_ASSERTION(!childFrame->GetNextSibling(), + "there can be only one inner table frame"); + } + + // Set the table wrapper's initial child list + newFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(newChildFrames)); + + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::CreateContinuingTableFrame( + nsIFrame* aFrame, nsContainerFrame* aParentFrame, nsIContent* aContent, + ComputedStyle* aComputedStyle) { + nsTableFrame* newFrame = NS_NewTableFrame(mPresShell, aComputedStyle); + + newFrame->Init(aContent, aParentFrame, aFrame); + + // Replicate any header/footer frames + nsFrameList childFrames; + for (nsIFrame* childFrame : aFrame->PrincipalChildList()) { + // See if it's a header/footer, possibly wrapped in a scroll frame. + nsTableRowGroupFrame* rowGroupFrame = + static_cast<nsTableRowGroupFrame*>(childFrame); + // If the row group was continued, then don't replicate it. + nsIFrame* rgNextInFlow = rowGroupFrame->GetNextInFlow(); + if (rgNextInFlow) { + rowGroupFrame->SetRepeatable(false); + } else if (rowGroupFrame->IsRepeatable()) { + // Replicate the header/footer frame. + nsTableRowGroupFrame* headerFooterFrame; + nsFrameList childList; + + nsFrameConstructorState state( + mPresShell, GetAbsoluteContainingBlock(newFrame, FIXED_POS), + GetAbsoluteContainingBlock(newFrame, ABS_POS), nullptr); + state.mCreatingExtraFrames = true; + + ComputedStyle* const headerFooterComputedStyle = rowGroupFrame->Style(); + headerFooterFrame = static_cast<nsTableRowGroupFrame*>( + NS_NewTableRowGroupFrame(mPresShell, headerFooterComputedStyle)); + + nsIContent* headerFooter = rowGroupFrame->GetContent(); + headerFooterFrame->Init(headerFooter, newFrame, nullptr); + + nsFrameConstructorSaveState absoluteSaveState; + MakeTablePartAbsoluteContainingBlockIfNeeded( + state, headerFooterComputedStyle->StyleDisplay(), absoluteSaveState, + headerFooterFrame); + + nsFrameConstructorSaveState floatSaveState; + state.MaybePushFloatContainingBlock(headerFooterFrame, floatSaveState); + + ProcessChildren(state, headerFooter, rowGroupFrame->Style(), + headerFooterFrame, true, childList, false, nullptr); + NS_ASSERTION(state.mFloatedList.IsEmpty(), "unexpected floated element"); + headerFooterFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + headerFooterFrame->SetRepeatable(true); + + // Table specific initialization + headerFooterFrame->InitRepeatedFrame(rowGroupFrame); + + // XXX Deal with absolute and fixed frames... + childFrames.AppendFrame(nullptr, headerFooterFrame); + } + } + + // Set the table frame's initial child list + newFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childFrames)); + + return newFrame; +} + +nsIFrame* nsCSSFrameConstructor::CreateContinuingFrame( + nsIFrame* aFrame, nsContainerFrame* aParentFrame, bool aIsFluid) { + ComputedStyle* computedStyle = aFrame->Style(); + nsIFrame* newFrame = nullptr; + nsIFrame* nextContinuation = aFrame->GetNextContinuation(); + nsIFrame* nextInFlow = aFrame->GetNextInFlow(); + + // Use the frame type to determine what type of frame to create + LayoutFrameType frameType = aFrame->Type(); + nsIContent* content = aFrame->GetContent(); + + if (LayoutFrameType::Text == frameType) { + newFrame = NS_NewContinuingTextFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::Inline == frameType) { + newFrame = NS_NewInlineFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::Block == frameType) { + MOZ_ASSERT(!aFrame->IsTableCaption(), + "no support for fragmenting table captions yet"); + newFrame = NS_NewBlockFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::ColumnSetWrapper == frameType) { + newFrame = + NS_NewColumnSetWrapperFrame(mPresShell, computedStyle, nsFrameState(0)); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::ColumnSet == frameType) { + MOZ_ASSERT(!aFrame->IsTableCaption(), + "no support for fragmenting table captions yet"); + newFrame = NS_NewColumnSetFrame(mPresShell, computedStyle, nsFrameState(0)); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::PrintedSheet == frameType) { + newFrame = ConstructPrintedSheetFrame(mPresShell, aParentFrame, aFrame); + } else if (LayoutFrameType::Page == frameType) { + nsContainerFrame* canvasFrame; // (unused outparam for ConstructPageFrame) + newFrame = + ConstructPageFrame(mPresShell, aParentFrame, aFrame, canvasFrame); + } else if (LayoutFrameType::TableWrapper == frameType) { + newFrame = CreateContinuingOuterTableFrame(aFrame, aParentFrame, content, + computedStyle); + } else if (LayoutFrameType::Table == frameType) { + newFrame = CreateContinuingTableFrame(aFrame, aParentFrame, content, + computedStyle); + } else if (LayoutFrameType::TableRowGroup == frameType) { + newFrame = NS_NewTableRowGroupFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + if (newFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) { + nsTableFrame::RegisterPositionedTablePart(newFrame); + } + } else if (LayoutFrameType::TableRow == frameType) { + nsTableRowFrame* rowFrame = NS_NewTableRowFrame(mPresShell, computedStyle); + + rowFrame->Init(content, aParentFrame, aFrame); + if (rowFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) { + nsTableFrame::RegisterPositionedTablePart(rowFrame); + } + + // Create a continuing frame for each table cell frame + nsFrameList newChildList; + nsIFrame* cellFrame = aFrame->PrincipalChildList().FirstChild(); + while (cellFrame) { + // See if it's a table cell frame + if (cellFrame->IsTableCellFrame()) { + nsIFrame* continuingCellFrame = + CreateContinuingFrame(cellFrame, rowFrame); + newChildList.AppendFrame(nullptr, continuingCellFrame); + } + cellFrame = cellFrame->GetNextSibling(); + } + + rowFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(newChildList)); + newFrame = rowFrame; + + } else if (LayoutFrameType::TableCell == frameType) { + // Warning: If you change this and add a wrapper frame around table cell + // frames, make sure Bug 368554 doesn't regress! + // See IsInAutoWidthTableCellForQuirk() in nsImageFrame.cpp. + nsTableFrame* tableFrame = + static_cast<nsTableRowFrame*>(aParentFrame)->GetTableFrame(); + nsTableCellFrame* cellFrame = + NS_NewTableCellFrame(mPresShell, computedStyle, tableFrame); + + cellFrame->Init(content, aParentFrame, aFrame); + if (cellFrame->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) { + nsTableFrame::RegisterPositionedTablePart(cellFrame); + } + + // Create a continuing area frame + nsIFrame* blockFrame = aFrame->PrincipalChildList().FirstChild(); + nsIFrame* continuingBlockFrame = + CreateContinuingFrame(blockFrame, cellFrame); + + SetInitialSingleChild(cellFrame, continuingBlockFrame); + newFrame = cellFrame; + } else if (LayoutFrameType::Line == frameType) { + newFrame = NS_NewFirstLineFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::Letter == frameType) { + newFrame = NS_NewFirstLetterFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::Image == frameType) { + auto* imageFrame = static_cast<nsImageFrame*>(aFrame); + newFrame = imageFrame->CreateContinuingFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::ImageControl == frameType) { + newFrame = NS_NewImageControlFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::FieldSet == frameType) { + newFrame = NS_NewFieldSetFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::FlexContainer == frameType) { + newFrame = NS_NewFlexContainerFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::GridContainer == frameType) { + newFrame = NS_NewGridContainerFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::Ruby == frameType) { + newFrame = NS_NewRubyFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::RubyBaseContainer == frameType) { + newFrame = NS_NewRubyBaseContainerFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else if (LayoutFrameType::RubyTextContainer == frameType) { + newFrame = NS_NewRubyTextContainerFrame(mPresShell, computedStyle); + newFrame->Init(content, aParentFrame, aFrame); + } else { + MOZ_CRASH("unexpected frame type"); + } + + // Init() set newFrame to be a fluid continuation of aFrame. + // If we want a non-fluid continuation, we need to call SetPrevContinuation() + // to reset NS_FRAME_IS_FLUID_CONTINUATION. + if (!aIsFluid) { + newFrame->SetPrevContinuation(aFrame); + } + + // If a continuing frame needs to carry frame state bits from its previous + // continuation or parent, set them in nsIFrame::Init(), or in any derived + // frame class's Init() if the bits are belong to specific group. + + if (nextInFlow) { + nextInFlow->SetPrevInFlow(newFrame); + newFrame->SetNextInFlow(nextInFlow); + } else if (nextContinuation) { + nextContinuation->SetPrevContinuation(newFrame); + newFrame->SetNextContinuation(nextContinuation); + } + + // aFrame cannot be a dynamic reflow root because it has a continuation now. + aFrame->RemoveStateBits(NS_FRAME_DYNAMIC_REFLOW_ROOT); + + // XXXalaskanemily: This avoids linear-time FirstContinuation lookups during + // paginated reflow, but there are a lot of smarter ways to manage this. We + // might also want to share the struct (refcount or some guarantee the struct + // will remain valid during reflow). + if (nsIFrame::PageValues* pageValues = + aFrame->GetProperty(nsIFrame::PageValuesProperty())) { + // It is possible that both values of a PageValues struct can be + // overwritten with null. If that's the case, then as a minor optimization + // we don't need to create a copy of the struct since this property being + // missing is equivalent to having null start/end values. + if (pageValues->mStartPageValue || pageValues->mEndPageValue) { + nsIFrame::PageValues* const newPageValues = + new nsIFrame::PageValues(*pageValues); + newFrame->SetProperty(nsIFrame::PageValuesProperty(), newPageValues); + } + } + + MOZ_ASSERT(!newFrame->GetNextSibling(), "unexpected sibling"); + return newFrame; +} + +nsresult nsCSSFrameConstructor::ReplicateFixedFrames( + nsPageContentFrame* aParentFrame) { + // Now deal with fixed-pos things.... They should appear on all pages, + // so we want to move over the placeholders when processing the child + // of the pageContentFrame. + + nsIFrame* prevPageContentFrame = aParentFrame->GetPrevInFlow(); + if (!prevPageContentFrame) { + return NS_OK; + } + nsContainerFrame* canvasFrame = + do_QueryFrame(aParentFrame->PrincipalChildList().FirstChild()); + nsIFrame* prevCanvasFrame = + prevPageContentFrame->PrincipalChildList().FirstChild(); + if (!canvasFrame || !prevCanvasFrame) { + // document's root element frame missing + return NS_ERROR_UNEXPECTED; + } + + nsFrameList fixedPlaceholders; + nsIFrame* firstFixed = + prevPageContentFrame->GetChildList(FrameChildListID::Fixed).FirstChild(); + if (!firstFixed) { + return NS_OK; + } + + // Don't allow abs-pos descendants of the fixed content to escape the content. + // This should not normally be possible (because fixed-pos elements should + // be absolute containers) but fixed-pos tables currently aren't abs-pos + // containers. + nsFrameConstructorState state(mPresShell, aParentFrame, nullptr, + mRootElementFrame); + state.mCreatingExtraFrames = true; + + // We can't use an ancestor filter here, because we're not going to + // be usefully recurring down the tree. This means that other + // places in frame construction can't assume a filter is + // initialized! + + // Iterate across fixed frames and replicate each whose placeholder is a + // descendant of aFrame. (We don't want to explicitly copy placeholders that + // are within fixed frames, because that would cause duplicates on the new + // page - bug 389619) + for (nsIFrame* fixed = firstFixed; fixed; fixed = fixed->GetNextSibling()) { + nsIFrame* prevPlaceholder = fixed->GetPlaceholderFrame(); + if (prevPlaceholder && nsLayoutUtils::IsProperAncestorFrame( + prevCanvasFrame, prevPlaceholder)) { + // We want to use the same style as the primary style frame for + // our content + nsIContent* content = fixed->GetContent(); + ComputedStyle* computedStyle = + nsLayoutUtils::GetStyleFrame(content)->Style(); + AutoFrameConstructionItemList items(this); + AddFrameConstructionItemsInternal(state, content, canvasFrame, true, + computedStyle, + {ItemFlag::AllowPageBreak}, items); + ConstructFramesFromItemList(state, items, canvasFrame, + /* aParentIsWrapperAnonBox = */ false, + fixedPlaceholders); + } + } + + // Add the placeholders to our primary child list. + // XXXbz this is a little screwed up, since the fixed frames will have + // broken auto-positioning. Oh, well. + NS_ASSERTION(!canvasFrame->PrincipalChildList().FirstChild(), + "leaking frames; doc root continuation must be empty"); + canvasFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(fixedPlaceholders)); + return NS_OK; +} + +nsCSSFrameConstructor::InsertionPoint nsCSSFrameConstructor::GetInsertionPoint( + nsIContent* aChild) { + MOZ_ASSERT(aChild); + nsIContent* insertionElement = aChild->GetFlattenedTreeParent(); + if (!insertionElement) { + // The element doesn't belong in the flattened tree, and thus we don't want + // to render it. + return {}; + } + + return {GetContentInsertionFrameFor(insertionElement), insertionElement}; +} + +// Capture state for the frame tree rooted at the frame associated with the +// content object, aContent +void nsCSSFrameConstructor::CaptureStateForFramesOf( + nsIContent* aContent, nsILayoutHistoryState* aHistoryState) { + if (!aHistoryState) { + return; + } + nsIFrame* frame = aContent->GetPrimaryFrame(); + if (frame == mRootElementFrame) { + frame = mRootElementFrame + ? GetAbsoluteContainingBlock(mRootElementFrame, FIXED_POS) + : GetRootFrame(); + } + for (; frame; + frame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame)) { + CaptureFrameState(frame, aHistoryState); + } +} + +static bool IsWhitespaceFrame(nsIFrame* aFrame) { + MOZ_ASSERT(aFrame, "invalid argument"); + return aFrame->IsTextFrame() && aFrame->GetContent()->TextIsOnlyWhitespace(); +} + +static nsIFrame* FindFirstNonWhitespaceChild(nsIFrame* aParentFrame) { + nsIFrame* f = aParentFrame->PrincipalChildList().FirstChild(); + while (f && IsWhitespaceFrame(f)) { + f = f->GetNextSibling(); + } + return f; +} + +static nsIFrame* FindNextNonWhitespaceSibling(nsIFrame* aFrame) { + nsIFrame* f = aFrame; + do { + f = f->GetNextSibling(); + } while (f && IsWhitespaceFrame(f)); + return f; +} + +static nsIFrame* FindPreviousNonWhitespaceSibling(nsIFrame* aFrame) { + nsIFrame* f = aFrame; + do { + f = f->GetPrevSibling(); + } while (f && IsWhitespaceFrame(f)); + return f; +} + +bool nsCSSFrameConstructor::MaybeRecreateContainerForFrameRemoval( + nsIFrame* aFrame) { +#define TRACE(reason) \ + PROFILER_MARKER("MaybeRecreateContainerForFrameRemoval: " reason, LAYOUT, \ + {}, Tracing, "Layout") + MOZ_ASSERT(aFrame, "Must have a frame"); + MOZ_ASSERT(aFrame->GetParent(), "Frame shouldn't be root"); + MOZ_ASSERT(aFrame == aFrame->FirstContinuation(), + "aFrame not the result of GetPrimaryFrame()?"); + + nsIFrame* inFlowFrame = aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) + ? aFrame->GetPlaceholderFrame() + : aFrame; + MOZ_ASSERT(inFlowFrame, "How did that happen?"); + MOZ_ASSERT(inFlowFrame == inFlowFrame->FirstContinuation(), + "placeholder for primary frame has previous continuations?"); + nsIFrame* parent = inFlowFrame->GetParent(); + + if (inFlowFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + nsIFrame* grandparent = parent->GetParent(); + MOZ_ASSERT(grandparent); + + bool needsReframe = + // 1. Removing a column-span may lead to an empty + // ::-moz-column-span-wrapper. + inFlowFrame->IsColumnSpan() || + // 2. Removing a frame which has any column-span siblings may also + // lead to an empty ::-moz-column-span-wrapper subtree. The + // column-span siblings were the frame's children, but later become + // the frame's siblings after CreateColumnSpanSiblings(). + inFlowFrame->HasColumnSpanSiblings() || + // 3. Removing the only child of a ::-moz-column-content, whose + // ColumnSet grandparent has a previous column-span sibling, requires + // reframing since we might connect the ColumnSet's next column-span + // sibling (if there's one). Note that this isn't actually needed if + // the ColumnSet is at the end of ColumnSetWrapper since we create + // empty ones at the end anyway, but we're not worried about + // optimizing that case. + (parent->Style()->GetPseudoType() == PseudoStyleType::columnContent && + // The only child in ::-moz-column-content (might be tall enough to + // split across columns) + !inFlowFrame->GetPrevSibling() && !inFlowFrame->GetNextSibling() && + // That ::-moz-column-content is the first column. + !parent->GetPrevInFlow() && + // The ColumnSet grandparent has a previous sibling that is a + // column-span. + grandparent->GetPrevSibling()); + + if (needsReframe) { + nsContainerFrame* containingBlock = + GetMultiColumnContainingBlockFor(inFlowFrame); + +#ifdef DEBUG + if (IsFramePartOfIBSplit(inFlowFrame)) { + nsIFrame* ibContainingBlock = GetIBContainingBlockFor(inFlowFrame); + MOZ_ASSERT(containingBlock == ibContainingBlock || + nsLayoutUtils::IsProperAncestorFrame(containingBlock, + ibContainingBlock), + "Multi-column containing block should be equal to or be the " + "ancestor of the IB containing block!"); + } +#endif + + TRACE("Multi-column"); + RecreateFramesForContent(containingBlock->GetContent(), + InsertionKind::Async); + return true; + } + } + + if (IsFramePartOfIBSplit(aFrame)) { + // The removal functions can't handle removal of an {ib} split directly; we + // need to rebuild the containing block. + TRACE("IB split removal"); + ReframeContainingBlock(aFrame); + return true; + } + + if (inFlowFrame->IsRenderedLegend()) { + TRACE("Fieldset / Legend"); + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + + // Now check for possibly needing to reconstruct due to a pseudo parent + // For the case of ruby pseudo parent, effectively, only pseudo rb/rt frame + // need to be checked here, since all other types of parent will be catched + // by "Check ruby containers" section below. + if (IsTableOrRubyPseudo(parent)) { + if (FindFirstNonWhitespaceChild(parent) == inFlowFrame || + !FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation()) || + // If it is a whitespace, and is the only child of the parent, the + // pseudo parent was created for the space, and should now be removed. + (IsWhitespaceFrame(aFrame) && + parent->PrincipalChildList().OnlyChild()) || + // If we're a table-column-group, then the OnlyChild check above is + // not going to catch cases when we're the first child. + (inFlowFrame->IsTableColGroupFrame() && + parent->GetChildList(FrameChildListID::ColGroup).FirstChild() == + inFlowFrame) || + // Similar if we're a table-caption. + (inFlowFrame->IsTableCaption() && + parent->GetChildList(FrameChildListID::Caption).FirstChild() == + inFlowFrame)) { + TRACE("Table or ruby pseudo parent"); + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + } + + // Might need to reconstruct things if this frame's nextSibling is a table + // or ruby pseudo, since removal of this frame might mean that this pseudo + // needs to get merged with the frame's prevSibling if that's also a table + // or ruby pseudo. + nsIFrame* nextSibling = + FindNextNonWhitespaceSibling(inFlowFrame->LastContinuation()); + NS_ASSERTION(!IsTableOrRubyPseudo(inFlowFrame), "Shouldn't happen here"); + // Effectively, for the ruby pseudo sibling case, only pseudo <ruby> frame + // need to be checked here, since all other types of such frames will have + // a ruby container parent, and be catched by "Check ruby containers" below. + if (nextSibling && IsTableOrRubyPseudo(nextSibling)) { + nsIFrame* prevSibling = FindPreviousNonWhitespaceSibling(inFlowFrame); + if (prevSibling && IsTableOrRubyPseudo(prevSibling)) { + TRACE("Table or ruby pseudo sibling"); + // Good enough to recreate frames for aFrame's parent's content; even if + // aFrame's parent is a pseudo, that'll be the right content node. + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + } + + // Check ruby containers + LayoutFrameType parentType = parent->Type(); + if (parentType == LayoutFrameType::Ruby || + RubyUtils::IsRubyContainerBox(parentType)) { + // In ruby containers, pseudo frames may be created from + // whitespaces or even nothing. There are two cases we actually + // need to handle here, but hard to check exactly: + // 1. Status of spaces beside the frame may vary, and related + // frames may be constructed or destroyed accordingly. + // 2. The type of the first child of a ruby frame determines + // whether a pseudo ruby base container should exist. + TRACE("Ruby container"); + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + + // Might need to reconstruct things if the removed frame's nextSibling is an + // anonymous flex item. The removed frame might've been what divided two + // runs of inline content into two anonymous flex items, which would now + // need to be merged. + // NOTE: It's fine that we've advanced nextSibling past whitespace (up above); + // we're only interested in anonymous flex items here, and those can never + // be adjacent to whitespace, since they absorb contiguous runs of inline + // non-replaced content (including whitespace). + if (nextSibling && IsAnonymousItem(nextSibling)) { + AssertAnonymousFlexOrGridItemParent(nextSibling, parent); + TRACE("Anon flex or grid item next sibling"); + // Recreate frames for the flex container (the removed frame's parent) + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + + // Might need to reconstruct things if the removed frame's nextSibling is + // null and its parent is an anonymous flex item. (This might be the last + // remaining child of that anonymous flex item, which can then go away.) + if (!nextSibling && IsAnonymousItem(parent)) { + AssertAnonymousFlexOrGridItemParent(parent, parent->GetParent()); + TRACE("Anon flex or grid item parent"); + // Recreate frames for the flex container (the removed frame's grandparent) + RecreateFramesForContent(parent->GetParent()->GetContent(), + InsertionKind::Async); + return true; + } + + // Reconstruct if inflowFrame is parent's only child, and parent is, or has, + // a non-fluid continuation, i.e. it was split by bidi resolution + if (!inFlowFrame->GetPrevSibling() && !inFlowFrame->GetNextSibling() && + ((parent->GetPrevContinuation() && !parent->GetPrevInFlow()) || + (parent->GetNextContinuation() && !parent->GetNextInFlow()))) { + TRACE("Removing last child of non-fluid split parent"); + RecreateFramesForContent(parent->GetContent(), InsertionKind::Async); + return true; + } + + // We might still need to reconstruct things if the parent of inFlowFrame is + // ib-split, since in that case the removal of aFrame might affect the + // splitting of its parent. + if (!IsFramePartOfIBSplit(parent)) { + return false; + } + + // If inFlowFrame is not the only in-flow child of |parent|, then removing + // it will change nothing about the {ib} split. + if (inFlowFrame != parent->PrincipalChildList().FirstChild() || + inFlowFrame->LastContinuation()->GetNextSibling()) { + return false; + } + + // If the parent is the first or last part of the {ib} split, then + // removing one of its kids will have no effect on the splitting. + // Get the first continuation up front so we don't have to do it twice. + nsIFrame* parentFirstContinuation = parent->FirstContinuation(); + if (!GetIBSplitSibling(parentFirstContinuation) || + !GetIBSplitPrevSibling(parentFirstContinuation)) { + return false; + } + + TRACE("IB split parent"); + ReframeContainingBlock(parent); + return true; +#undef TRACE +} + +void nsCSSFrameConstructor::UpdateTableCellSpans(nsIContent* aContent) { + nsTableCellFrame* cellFrame = do_QueryFrame(aContent->GetPrimaryFrame()); + + // It's possible that this warning could fire if some other style change + // simultaneously changes the 'display' of the element and makes it no + // longer be a table cell. + NS_WARNING_ASSERTION(cellFrame, "Hint should only be posted on table cells!"); + + if (cellFrame) { + cellFrame->GetTableFrame()->RowOrColSpanChanged(cellFrame); + } +} + +static nsIContent* GetTopmostMathMLElement(nsIContent* aMathMLContent) { + MOZ_ASSERT(aMathMLContent->IsMathMLElement()); + MOZ_ASSERT(aMathMLContent->GetPrimaryFrame()); + MOZ_ASSERT( + aMathMLContent->GetPrimaryFrame()->IsFrameOfType(nsIFrame::eMathML)); + nsIContent* root = aMathMLContent; + + for (nsIContent* parent = aMathMLContent->GetFlattenedTreeParent(); parent; + parent = parent->GetFlattenedTreeParent()) { + nsIFrame* frame = parent->GetPrimaryFrame(); + if (!frame || !frame->IsFrameOfType(nsIFrame::eMathML)) { + break; + } + root = parent; + } + + return root; +} + +// We don't know how to re-insert an anonymous subtree root, so recreate the +// closest non-generated ancestor instead, except for a few special cases... +static bool ShouldRecreateContainerForNativeAnonymousContentRoot( + nsIContent* aContent) { + if (!aContent->IsRootOfNativeAnonymousSubtree()) { + return false; + } + if (ManualNACPtr::IsManualNAC(aContent)) { + // Editor NAC, would enter an infinite loop, and we sorta get away with it + // because it's all abspos. + return false; + } + if (auto* el = Element::FromNode(aContent)) { + if (auto* classes = el->GetClasses()) { + if (classes->Contains(nsGkAtoms::mozCustomContentContainer, + eCaseMatters)) { + // Canvas anonymous content (like the custom content container) is also + // fine, because its only sibling is a tooltip which is also abspos, so + // relative insertion order doesn't really matter. + // + // This is important because the inspector uses it, and we don't want + // inspecting the page to change behavior heavily (and reframing + // unfortunately has side-effects sometimes, even though they're bugs). + return false; + } + } + } + + return true; +} + +void nsCSSFrameConstructor::RecreateFramesForContent( + nsIContent* aContent, InsertionKind aInsertionKind) { + MOZ_ASSERT(aContent); + + // If there is no document, we don't want to recreate frames for it. (You + // shouldn't generally be giving this method content without a document + // anyway). + // Rebuilding the frame tree can have bad effects, especially if it's the + // frame tree for chrome (see bug 157322). + if (NS_WARN_IF(!aContent->GetComposedDoc())) { + return; + } + + // TODO(emilio): We technically can find the right insertion point nowadays + // using StyleChildrenIterator rather than FlattenedTreeIterator. But we'd + // need to tweak the setup to insert into replaced elements to filter which + // anonymous roots can be allowed, and which can't. + // + // TODO(emilio, 2022): Is this true? If we have a replaced element we wouldn't + // have generated e.g., a ::before/::after pseudo-element to begin with (which + // is what this code is about, so maybe we can just remove this piece of code + // altogether). + if (ShouldRecreateContainerForNativeAnonymousContentRoot(aContent)) { + do { + aContent = aContent->GetParent(); + } while (ShouldRecreateContainerForNativeAnonymousContentRoot(aContent)); + return RecreateFramesForContent(aContent, InsertionKind::Async); + } + + nsIFrame* frame = aContent->GetPrimaryFrame(); + if (frame && frame->IsFrameOfType(nsIFrame::eMathML)) { + // Reframe the topmost MathML element to prevent exponential blowup + // (see bug 397518). + aContent = GetTopmostMathMLElement(aContent); + frame = aContent->GetPrimaryFrame(); + } + + if (frame) { + nsIFrame* parent = frame->GetParent(); + nsIContent* parentContent = parent ? parent->GetContent() : nullptr; + // If the parent frame is a leaf then the subsequent insert will fail to + // create a frame, so we need to recreate the parent content. This happens + // with native anonymous content from the editor. + if (parent && parent->IsLeaf() && parentContent && + parentContent != aContent) { + return RecreateFramesForContent(parentContent, InsertionKind::Async); + } + } + + if (frame && MaybeRecreateContainerForFrameRemoval(frame)) { + return; + } + + MOZ_ASSERT(aContent->GetParentNode()); + + // Remove the frames associated with the content object. + nsIContent* nextSibling = aContent->IsRootOfNativeAnonymousSubtree() + ? nullptr + : aContent->GetNextSibling(); + bool didReconstruct = + ContentRemoved(aContent, nextSibling, REMOVE_FOR_RECONSTRUCTION); + + if (!didReconstruct) { + if (aInsertionKind == InsertionKind::Async && aContent->IsElement()) { + // FIXME(emilio, bug 1397239): There's nothing removing the frame state + // for elements that go away before we come back to the frame + // constructor. + // + // Also, it'd be nice to just use the `ContentRangeInserted` path for + // both elements and non-elements, but we need to make lazy frame + // construction to apply to all elements first. + RestyleManager()->PostRestyleEvent(aContent->AsElement(), RestyleHint{0}, + nsChangeHint_ReconstructFrame); + } else { + // Now, recreate the frames associated with this content object. If + // ContentRemoved triggered reconstruction, then we don't need to do this + // because the frames will already have been built. + ContentRangeInserted(aContent, aContent->GetNextSibling(), + aInsertionKind); + } + } +} + +bool nsCSSFrameConstructor::DestroyFramesFor(nsIContent* aContent) { + MOZ_ASSERT(aContent && aContent->GetParentNode()); + + nsIContent* nextSibling = aContent->IsRootOfNativeAnonymousSubtree() + ? nullptr + : aContent->GetNextSibling(); + + return ContentRemoved(aContent, nextSibling, REMOVE_FOR_RECONSTRUCTION); +} + +////////////////////////////////////////////////////////////////////// + +// Block frame construction code + +already_AddRefed<ComputedStyle> nsCSSFrameConstructor::GetFirstLetterStyle( + nsIContent* aContent, ComputedStyle* aComputedStyle) { + if (aContent) { + return mPresShell->StyleSet()->ResolvePseudoElementStyle( + *aContent->AsElement(), PseudoStyleType::firstLetter, aComputedStyle); + } + return nullptr; +} + +already_AddRefed<ComputedStyle> nsCSSFrameConstructor::GetFirstLineStyle( + nsIContent* aContent, ComputedStyle* aComputedStyle) { + if (aContent) { + return mPresShell->StyleSet()->ResolvePseudoElementStyle( + *aContent->AsElement(), PseudoStyleType::firstLine, aComputedStyle); + } + return nullptr; +} + +// Predicate to see if a given content (block element) has +// first-letter style applied to it. +bool nsCSSFrameConstructor::ShouldHaveFirstLetterStyle( + nsIContent* aContent, ComputedStyle* aComputedStyle) { + return nsLayoutUtils::HasPseudoStyle(aContent, aComputedStyle, + PseudoStyleType::firstLetter, + mPresShell->GetPresContext()); +} + +bool nsCSSFrameConstructor::HasFirstLetterStyle(nsIFrame* aBlockFrame) { + MOZ_ASSERT(aBlockFrame, "Need a frame"); + NS_ASSERTION(aBlockFrame->IsBlockFrameOrSubclass(), "Not a block frame?"); + + return aBlockFrame->HasAnyStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE); +} + +bool nsCSSFrameConstructor::ShouldHaveFirstLineStyle( + nsIContent* aContent, ComputedStyle* aComputedStyle) { + bool hasFirstLine = nsLayoutUtils::HasPseudoStyle( + aContent, aComputedStyle, PseudoStyleType::firstLine, + mPresShell->GetPresContext()); + return hasFirstLine && !aContent->IsHTMLElement(nsGkAtoms::fieldset); +} + +void nsCSSFrameConstructor::ShouldHaveSpecialBlockStyle( + nsIContent* aContent, ComputedStyle* aComputedStyle, + bool* aHaveFirstLetterStyle, bool* aHaveFirstLineStyle) { + *aHaveFirstLetterStyle = ShouldHaveFirstLetterStyle(aContent, aComputedStyle); + *aHaveFirstLineStyle = ShouldHaveFirstLineStyle(aContent, aComputedStyle); +} + +/* static */ +const nsCSSFrameConstructor::PseudoParentData + nsCSSFrameConstructor::sPseudoParentData[eParentTypeCount] = { + // Cell + {{&nsCSSFrameConstructor::ConstructTableCell, + FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRow)}, + PseudoStyleType::tableCell}, + // Row + {{&nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRowGroup)}, + PseudoStyleType::tableRow}, + // Row group + {{&nsCSSFrameConstructor::ConstructTableRowOrRowGroup, + FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)}, + PseudoStyleType::tableRowGroup}, + // Column group + {{ToCreationFunc(NS_NewTableColGroupFrame), + FCDATA_IS_TABLE_PART | FCDATA_SKIP_FRAMESET | + FCDATA_DISALLOW_OUT_OF_FLOW | FCDATA_USE_CHILD_ITEMS | + FCDATA_SKIP_ABSPOS_PUSH | + // Not FCDATA_IS_WRAPPER_ANON_BOX, because we don't need to + // restyle these: they have non-inheriting styles. + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeTable)}, + PseudoStyleType::tableColGroup}, + // Table + {{&nsCSSFrameConstructor::ConstructTable, + FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX}, + PseudoStyleType::table}, + // Ruby + {{ToCreationFunc(NS_NewRubyFrame), + FCDATA_IS_LINE_PARTICIPANT | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX | FCDATA_SKIP_FRAMESET}, + PseudoStyleType::ruby}, + // Ruby Base + {{ToCreationFunc(NS_NewRubyBaseFrame), + FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyBaseContainer) | + FCDATA_SKIP_FRAMESET}, + PseudoStyleType::rubyBase}, + // Ruby Base Container + {{ToCreationFunc(NS_NewRubyBaseContainerFrame), + FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby) | + FCDATA_SKIP_FRAMESET}, + PseudoStyleType::rubyBaseContainer}, + // Ruby Text + {{ToCreationFunc(NS_NewRubyTextFrame), + FCDATA_USE_CHILD_ITEMS | FCDATA_IS_LINE_PARTICIPANT | + FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRubyTextContainer) | + FCDATA_SKIP_FRAMESET}, + PseudoStyleType::rubyText}, + // Ruby Text Container + {{ToCreationFunc(NS_NewRubyTextContainerFrame), + FCDATA_USE_CHILD_ITEMS | FCDATA_IS_WRAPPER_ANON_BOX | + FCDATA_DESIRED_PARENT_TYPE_TO_BITS(eTypeRuby) | + FCDATA_SKIP_FRAMESET}, + PseudoStyleType::rubyTextContainer}}; + +void nsCSSFrameConstructor::CreateNeededAnonFlexOrGridItems( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems, + nsIFrame* aParentFrame) { + if (aItems.IsEmpty()) { + return; + } + + if (!aParentFrame->IsFlexOrGridContainer() && + !aParentFrame->IsXULBoxFrame()) { + return; + } + + const bool isLegacyWebKitBox = + IsFlexContainerForLegacyWebKitBox(aParentFrame); + FCItemIterator iter(aItems); + do { + // Advance iter past children that don't want to be wrapped + if (iter.SkipItemsThatDontNeedAnonFlexOrGridItem(aState, + isLegacyWebKitBox)) { + // Hit the end of the items without finding any remaining children that + // need to be wrapped. We're finished! + return; + } + + // If our next potentially-wrappable child is whitespace, then see if + // there's anything wrappable immediately after it. If not, we just drop + // the whitespace and move on. (We're not supposed to create any anonymous + // flex/grid items that _only_ contain whitespace). + // (BUT if this is generated content, then we don't give whitespace nodes + // any special treatment, because they're probably not really whitespace -- + // they're just temporarily empty, waiting for their generated text.) + // XXXdholbert If this node's generated text will *actually end up being + // entirely whitespace*, then we technically should still skip over it, per + // the CSS grid & flexbox specs. I'm not bothering with that at this point, + // since it's a pretty extreme edge case. + if (!aParentFrame->IsGeneratedContentFrame() && + iter.item().IsWhitespace(aState)) { + FCItemIterator afterWhitespaceIter(iter); + bool hitEnd = afterWhitespaceIter.SkipWhitespace(aState); + bool nextChildNeedsAnonItem = + !hitEnd && afterWhitespaceIter.item().NeedsAnonFlexOrGridItem( + aState, isLegacyWebKitBox); + + if (!nextChildNeedsAnonItem) { + // There's nothing after the whitespace that we need to wrap, so we + // just drop this run of whitespace. + iter.DeleteItemsTo(this, afterWhitespaceIter); + if (hitEnd) { + // Nothing left to do -- we're finished! + return; + } + // else, we have a next child and it does not want to be wrapped. So, + // we jump back to the beginning of the loop to skip over that child + // (and anything else non-wrappable after it) + MOZ_ASSERT(!iter.IsDone() && !iter.item().NeedsAnonFlexOrGridItem( + aState, isLegacyWebKitBox), + "hitEnd and/or nextChildNeedsAnonItem lied"); + continue; + } + } + + // Now |iter| points to the first child that needs to be wrapped in an + // anonymous flex/grid item. Now we see how many children after it also want + // to be wrapped in an anonymous flex/grid item. + FCItemIterator endIter(iter); // iterator to find the end of the group + endIter.SkipItemsThatNeedAnonFlexOrGridItem(aState, isLegacyWebKitBox); + + NS_ASSERTION(iter != endIter, + "Should've had at least one wrappable child to seek past"); + + // Now, we create the anonymous flex or grid item to contain the children + // between |iter| and |endIter|. + nsIContent* parentContent = aParentFrame->GetContent(); + RefPtr<ComputedStyle> wrapperStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::anonymousItem, aParentFrame->Style()); + + static constexpr FrameConstructionData sBlockFormattingContextFCData( + ToCreationFunc(NS_NewBlockFormattingContext), + FCDATA_SKIP_FRAMESET | FCDATA_USE_CHILD_ITEMS | + FCDATA_IS_WRAPPER_ANON_BOX); + + FrameConstructionItem* newItem = new (this) + FrameConstructionItem(&sBlockFormattingContextFCData, + // Use the content of our parent frame + parentContent, wrapperStyle.forget(), true); + + newItem->mIsAllInline = + newItem->mComputedStyle->StyleDisplay()->IsInlineOutsideStyle(); + newItem->mIsBlock = !newItem->mIsAllInline; + + MOZ_ASSERT(!newItem->mIsAllInline && newItem->mIsBlock, + "expecting anonymous flex/grid items to be block-level " + "(this will make a difference when we encounter " + "'align-items: baseline')"); + + // Anonymous flex and grid items induce line boundaries around their + // contents. + newItem->mChildItems.SetLineBoundaryAtStart(true); + newItem->mChildItems.SetLineBoundaryAtEnd(true); + // The parent of the items in aItems is also the parent of the items + // in mChildItems + newItem->mChildItems.SetParentHasNoShadowDOM(aItems.ParentHasNoShadowDOM()); + + // Eat up all items between |iter| and |endIter| and put them in our + // wrapper. This advances |iter| to point to |endIter|. + iter.AppendItemsToList(this, endIter, newItem->mChildItems); + + iter.InsertItem(newItem); + } while (!iter.IsDone()); +} + +/* static */ nsCSSFrameConstructor::RubyWhitespaceType +nsCSSFrameConstructor::ComputeRubyWhitespaceType(StyleDisplay aPrevDisplay, + StyleDisplay aNextDisplay) { + MOZ_ASSERT(nsStyleDisplay::IsRubyDisplayType(aPrevDisplay) && + nsStyleDisplay::IsRubyDisplayType(aNextDisplay)); + if (aPrevDisplay == aNextDisplay && + (aPrevDisplay == StyleDisplay::RubyBase || + aPrevDisplay == StyleDisplay::RubyText)) { + return eRubyInterLeafWhitespace; + } + if (aNextDisplay == StyleDisplay::RubyText || + aNextDisplay == StyleDisplay::RubyTextContainer) { + return eRubyInterLevelWhitespace; + } + return eRubyInterSegmentWhitespace; +} + +/** + * This function checks the content from |aStartIter| to |aEndIter|, + * determines whether it contains only whitespace, and if yes, + * interprets the type of whitespace. This method does not change + * any of the iters. + */ +/* static */ nsCSSFrameConstructor::RubyWhitespaceType +nsCSSFrameConstructor::InterpretRubyWhitespace(nsFrameConstructorState& aState, + const FCItemIterator& aStartIter, + const FCItemIterator& aEndIter) { + if (!aStartIter.item().IsWhitespace(aState)) { + return eRubyNotWhitespace; + } + + FCItemIterator spaceEndIter(aStartIter); + spaceEndIter.SkipWhitespace(aState); + if (spaceEndIter != aEndIter) { + return eRubyNotWhitespace; + } + + // Any leading or trailing whitespace in non-pseudo ruby box + // should have been trimmed, hence there should not be any + // whitespace at the start or the end. + MOZ_ASSERT(!aStartIter.AtStart() && !aEndIter.IsDone()); + FCItemIterator prevIter(aStartIter); + prevIter.Prev(); + return ComputeRubyWhitespaceType( + prevIter.item().mComputedStyle->StyleDisplay()->mDisplay, + aEndIter.item().mComputedStyle->StyleDisplay()->mDisplay); +} + +/** + * This function eats up consecutive items which do not want the current + * parent into either a ruby base box or a ruby text box. When it + * returns, |aIter| points to the first item it doesn't wrap. + */ +void nsCSSFrameConstructor::WrapItemsInPseudoRubyLeafBox( + FCItemIterator& aIter, ComputedStyle* aParentStyle, + nsIContent* aParentContent) { + StyleDisplay parentDisplay = aParentStyle->StyleDisplay()->mDisplay; + ParentType parentType, wrapperType; + if (parentDisplay == StyleDisplay::RubyTextContainer) { + parentType = eTypeRubyTextContainer; + wrapperType = eTypeRubyText; + } else { + MOZ_ASSERT(parentDisplay == StyleDisplay::RubyBaseContainer); + parentType = eTypeRubyBaseContainer; + wrapperType = eTypeRubyBase; + } + + MOZ_ASSERT(aIter.item().DesiredParentType() != parentType, + "Should point to something needs to be wrapped."); + + FCItemIterator endIter(aIter); + endIter.SkipItemsNotWantingParentType(parentType); + + WrapItemsInPseudoParent(aParentContent, aParentStyle, wrapperType, aIter, + endIter); +} + +/** + * This function eats up consecutive items into a ruby level container. + * It may create zero or one level container. When it returns, |aIter| + * points to the first item it doesn't wrap. + */ +void nsCSSFrameConstructor::WrapItemsInPseudoRubyLevelContainer( + nsFrameConstructorState& aState, FCItemIterator& aIter, + ComputedStyle* aParentStyle, nsIContent* aParentContent) { + MOZ_ASSERT(aIter.item().DesiredParentType() != eTypeRuby, + "Pointing to a level container?"); + + FrameConstructionItem& firstItem = aIter.item(); + ParentType wrapperType = firstItem.DesiredParentType(); + if (wrapperType != eTypeRubyTextContainer) { + // If the first item is not ruby text, + // it should be in a base container. + wrapperType = eTypeRubyBaseContainer; + } + + FCItemIterator endIter(aIter); + do { + if (endIter.SkipItemsWantingParentType(wrapperType) || + // If the skipping above stops at some item which wants a + // different ruby parent, then we have finished. + IsRubyParentType(endIter.item().DesiredParentType())) { + // No more items need to be wrapped in this level container. + break; + } + + FCItemIterator contentEndIter(endIter); + contentEndIter.SkipItemsNotWantingRubyParent(); + // endIter must be on something doesn't want a ruby parent. + MOZ_ASSERT(contentEndIter != endIter); + + // InterpretRubyWhitespace depends on the fact that any leading or + // trailing whitespace described in the spec have been trimmed at + // this point. With this precondition, it is safe not to check + // whether contentEndIter has been done. + RubyWhitespaceType whitespaceType = + InterpretRubyWhitespace(aState, endIter, contentEndIter); + if (whitespaceType == eRubyInterLevelWhitespace) { + // Remove inter-level whitespace. + bool atStart = (aIter == endIter); + endIter.DeleteItemsTo(this, contentEndIter); + if (atStart) { + aIter = endIter; + } + } else if (whitespaceType == eRubyInterSegmentWhitespace) { + // If this level container starts with inter-segment whitespaces, + // wrap them. Break at contentEndIter. Otherwise, leave it here. + // Break at endIter. They will be wrapped when we are here again. + if (aIter == endIter) { + MOZ_ASSERT(wrapperType == eTypeRubyBaseContainer, + "Inter-segment whitespace should be wrapped in rbc"); + endIter = contentEndIter; + } + break; + } else if (wrapperType == eTypeRubyTextContainer && + whitespaceType != eRubyInterLeafWhitespace) { + // Misparented inline content that's not inter-annotation + // whitespace doesn't belong in a pseudo ruby text container. + // Break at endIter. + break; + } else { + endIter = contentEndIter; + } + } while (!endIter.IsDone()); + + // It is possible that everything our parent wants us to wrap is + // simply an inter-level whitespace, which has been trimmed, or + // an inter-segment whitespace, which will be wrapped later. + // In those cases, don't create anything. + if (aIter != endIter) { + WrapItemsInPseudoParent(aParentContent, aParentStyle, wrapperType, aIter, + endIter); + } +} + +/** + * This function trims leading and trailing whitespaces + * in the given item list. + */ +void nsCSSFrameConstructor::TrimLeadingAndTrailingWhitespaces( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems) { + FCItemIterator iter(aItems); + if (!iter.IsDone() && iter.item().IsWhitespace(aState)) { + FCItemIterator spaceEndIter(iter); + spaceEndIter.SkipWhitespace(aState); + iter.DeleteItemsTo(this, spaceEndIter); + } + + iter.SetToEnd(); + if (!iter.AtStart()) { + FCItemIterator spaceEndIter(iter); + do { + iter.Prev(); + if (iter.AtStart()) { + // It's fine to not check the first item, because we + // should have trimmed leading whitespaces above. + break; + } + } while (iter.item().IsWhitespace(aState)); + iter.Next(); + if (iter != spaceEndIter) { + iter.DeleteItemsTo(this, spaceEndIter); + } + } +} + +/** + * This function walks through the child list (aItems) and creates + * needed pseudo ruby boxes to wrap misparented children. + */ +void nsCSSFrameConstructor::CreateNeededPseudoInternalRubyBoxes( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems, + nsIFrame* aParentFrame) { + const ParentType ourParentType = GetParentType(aParentFrame); + if (!IsRubyParentType(ourParentType) || + aItems.AllWantParentType(ourParentType)) { + return; + } + + if (!IsRubyPseudo(aParentFrame) || + ourParentType == eTypeRuby /* for 'display:block ruby' */) { + // Normally, ruby pseudo frames start from and end at some elements, + // which means they don't have leading and trailing whitespaces at + // all. But there are two cases where they do actually have leading + // or trailing whitespaces: + // 1. It is an inter-segment whitespace which in an individual ruby + // base container. + // 2. The pseudo frame starts from or ends at consecutive inline + // content, which is not pure whitespace, but includes some. + // In either case, the whitespaces are not the leading or trailing + // whitespaces defined in the spec, and thus should not be trimmed. + TrimLeadingAndTrailingWhitespaces(aState, aItems); + } + + FCItemIterator iter(aItems); + nsIContent* parentContent = aParentFrame->GetContent(); + ComputedStyle* parentStyle = aParentFrame->Style(); + while (!iter.IsDone()) { + if (!iter.SkipItemsWantingParentType(ourParentType)) { + if (ourParentType == eTypeRuby) { + WrapItemsInPseudoRubyLevelContainer(aState, iter, parentStyle, + parentContent); + } else { + WrapItemsInPseudoRubyLeafBox(iter, parentStyle, parentContent); + } + } + } +} + +/* + * This function works as follows: we walk through the child list (aItems) and + * find items that cannot have aParentFrame as their parent. We wrap + * continuous runs of such items into a FrameConstructionItem for a frame that + * gets them closer to their desired parents. For example, a run of non-row + * children of a row-group will get wrapped in a row. When we later construct + * the frame for this wrapper (in this case for the row), it'll be the correct + * parent for the cells in the set of items we wrapped or we'll wrap cells + * around everything else. At the end of this method, aItems is guaranteed to + * contain only items for frames that can be direct kids of aParentFrame. + */ +void nsCSSFrameConstructor::CreateNeededPseudoContainers( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems, + nsIFrame* aParentFrame) { + ParentType ourParentType = GetParentType(aParentFrame); + if (IsRubyParentType(ourParentType) || + aItems.AllWantParentType(ourParentType)) { + // Nothing to do here + return; + } + + FCItemIterator iter(aItems); + do { + if (iter.SkipItemsWantingParentType(ourParentType)) { + // Nothing else to do here; we're finished + return; + } + + // Now we're pointing to the first child that wants a different parent + // type. + + // Now try to figure out what kids we can group together. We can generally + // group everything that has a different desired parent type from us. Two + // exceptions to this: + // 1) If our parent type is table, we can't group columns with anything + // else other than whitespace. + // 2) Whitespace that lies between two things we can group which both want + // a non-block parent should be dropped, even if we can't group them + // with each other and even if the whitespace wants a parent of + // ourParentType. Ends of the list count as things that don't want a + // block parent (so that for example we'll drop a whitespace-only list). + + FCItemIterator endIter(iter); /* iterator to find the end of the group */ + ParentType groupingParentType = endIter.item().DesiredParentType(); + if (aItems.AllWantParentType(groupingParentType) && + groupingParentType != eTypeBlock) { + // Just group them all and be done with it. We need the check for + // eTypeBlock here to catch the "all the items are whitespace" case + // described above. + endIter.SetToEnd(); + } else { + // Locate the end of the group. + + // Keep track of the type the previous item wanted, in case we have to + // deal with whitespace. Start it off with ourParentType, since that's + // the last thing |iter| would have skipped over. + ParentType prevParentType = ourParentType; + do { + // Walk an iterator past any whitespace that we might be able to drop + // from the list + FCItemIterator spaceEndIter(endIter); + if (prevParentType != eTypeBlock && + !aParentFrame->IsGeneratedContentFrame() && + spaceEndIter.item().IsWhitespace(aState)) { + bool trailingSpaces = spaceEndIter.SkipWhitespace(aState); + + // We drop the whitespace in the following cases: + // 1) If these are not trailing spaces and the next item wants a table + // or table-part parent + // 2) If these are trailing spaces and aParentFrame is a + // tabular container according to rule 1.3 of CSS 2.1 Sec 17.2.1. + // (Being a tabular container pretty much means ourParentType is + // not eTypeBlock besides the eTypeColGroup case, which won't + // reach here.) + if ((!trailingSpaces && + IsTableParentType(spaceEndIter.item().DesiredParentType())) || + (trailingSpaces && ourParentType != eTypeBlock)) { + bool updateStart = (iter == endIter); + endIter.DeleteItemsTo(this, spaceEndIter); + NS_ASSERTION(trailingSpaces == endIter.IsDone(), + "These should match"); + + if (updateStart) { + iter = endIter; + } + + if (trailingSpaces) { + break; /* Found group end */ + } + + if (updateStart) { + // Update groupingParentType, since it might have been eTypeBlock + // just because of the whitespace. + groupingParentType = iter.item().DesiredParentType(); + } + } + } + + // Now endIter points to a non-whitespace item or a non-droppable + // whitespace item. In the latter case, if this is the end of the group + // we'll traverse this whitespace again. But it'll all just be quick + // DesiredParentType() checks which will match ourParentType (that's + // what it means that this is the group end), so it's OK. + // However, when we are grouping a ruby parent, and endIter points to + // a non-droppable whitespace, if the next non-whitespace item also + // wants a ruby parent, the whitespace should also be included into + // the current ruby container. + prevParentType = endIter.item().DesiredParentType(); + if (prevParentType == ourParentType && + (endIter == spaceEndIter || spaceEndIter.IsDone() || + !IsRubyParentType(groupingParentType) || + !IsRubyParentType(spaceEndIter.item().DesiredParentType()))) { + // End the group at endIter. + break; + } + + if (ourParentType == eTypeTable && + (prevParentType == eTypeColGroup) != + (groupingParentType == eTypeColGroup)) { + // Either we started with columns and now found something else, or + // vice versa. In any case, end the grouping. + break; + } + + // If we have some whitespace that we were not able to drop and there is + // an item after the whitespace that is already properly parented, then + // make sure to include the spaces in our group but stop the group after + // that. + if (spaceEndIter != endIter && !spaceEndIter.IsDone() && + ourParentType == spaceEndIter.item().DesiredParentType()) { + endIter = spaceEndIter; + break; + } + + // Include the whitespace we didn't drop (if any) in the group. + endIter = spaceEndIter; + prevParentType = endIter.item().DesiredParentType(); + + endIter.Next(); + } while (!endIter.IsDone()); + } + + if (iter == endIter) { + // Nothing to wrap here; just skipped some whitespace + continue; + } + + // Now group together all the items between iter and endIter. The right + // parent type to use depends on ourParentType. + ParentType wrapperType; + switch (ourParentType) { + case eTypeRow: + // The parent type for a cell is eTypeBlock, since that's what a cell + // looks like to its kids. + wrapperType = eTypeBlock; + break; + case eTypeRowGroup: + wrapperType = eTypeRow; + break; + case eTypeTable: + // Either colgroup or rowgroup, depending on what we're grouping. + wrapperType = + groupingParentType == eTypeColGroup ? eTypeColGroup : eTypeRowGroup; + break; + case eTypeColGroup: + MOZ_CRASH("Colgroups should be suppresing non-col child items"); + default: + NS_ASSERTION(ourParentType == eTypeBlock, "Unrecognized parent type"); + if (IsRubyParentType(groupingParentType)) { + wrapperType = eTypeRuby; + } else { + NS_ASSERTION(IsTableParentType(groupingParentType), + "groupingParentType should be either Ruby or table"); + wrapperType = eTypeTable; + } + } + + ComputedStyle* parentStyle = aParentFrame->Style(); + WrapItemsInPseudoParent(aParentFrame->GetContent(), parentStyle, + wrapperType, iter, endIter); + + // Now |iter| points to the item that was the first one we didn't wrap; + // loop and see whether we need to skip it or wrap it in something + // different. + } while (!iter.IsDone()); +} + +/** + * This method wraps frame construction item from |aIter| to + * |aEndIter|. After it returns, aIter points to the first item + * after the wrapper. + */ +void nsCSSFrameConstructor::WrapItemsInPseudoParent( + nsIContent* aParentContent, ComputedStyle* aParentStyle, + ParentType aWrapperType, FCItemIterator& aIter, + const FCItemIterator& aEndIter) { + const PseudoParentData& pseudoData = sPseudoParentData[aWrapperType]; + PseudoStyleType pseudoType = pseudoData.mPseudoType; + auto& parentDisplay = *aParentStyle->StyleDisplay(); + auto parentDisplayInside = parentDisplay.DisplayInside(); + + // XXXmats should we use IsInlineInsideStyle() here instead? seems odd to + // exclude RubyBaseContainer/RubyTextContainer... + if (pseudoType == PseudoStyleType::table && + (parentDisplay.IsInlineFlow() || + parentDisplayInside == StyleDisplayInside::RubyBase || + parentDisplayInside == StyleDisplayInside::RubyText)) { + pseudoType = PseudoStyleType::inlineTable; + } + + RefPtr<ComputedStyle> wrapperStyle; + if (pseudoData.mFCData.mBits & FCDATA_IS_WRAPPER_ANON_BOX) { + wrapperStyle = mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + pseudoType, aParentStyle); + } else { + wrapperStyle = + mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle( + pseudoType); + } + + FrameConstructionItem* newItem = new (this) + FrameConstructionItem(&pseudoData.mFCData, + // Use the content of our parent frame + aParentContent, wrapperStyle.forget(), true); + + const nsStyleDisplay* disp = newItem->mComputedStyle->StyleDisplay(); + // Here we're cheating a tad... technically, table-internal items should be + // inline if aParentFrame is inline, but they'll get wrapped in an + // inline-table in the end, so it'll all work out. In any case, arguably + // we don't need to maintain this state at this point... but it's better + // to, I guess. + newItem->mIsAllInline = disp->IsInlineOutsideStyle(); + + bool isRuby = disp->IsRubyDisplayType(); + if (!isRuby) { + // Table pseudo frames always induce line boundaries around their + // contents. + newItem->mChildItems.SetLineBoundaryAtStart(true); + newItem->mChildItems.SetLineBoundaryAtEnd(true); + } + // The parent of the items in aItems is also the parent of the items + // in mChildItems + newItem->mChildItems.SetParentHasNoShadowDOM( + aIter.List()->ParentHasNoShadowDOM()); + + // Eat up all items between |aIter| and |aEndIter| and put them in our + // wrapper Advances |aIter| to point to |aEndIter|. + aIter.AppendItemsToList(this, aEndIter, newItem->mChildItems); + + aIter.InsertItem(newItem); +} + +void nsCSSFrameConstructor::CreateNeededPseudoSiblings( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems, + nsIFrame* aParentFrame) { + if (aItems.IsEmpty() || GetParentType(aParentFrame) != eTypeRuby) { + return; + } + + FCItemIterator iter(aItems); + StyleDisplay firstDisplay = + iter.item().mComputedStyle->StyleDisplay()->mDisplay; + if (firstDisplay == StyleDisplay::RubyBaseContainer) { + return; + } + NS_ASSERTION(firstDisplay == StyleDisplay::RubyTextContainer, + "Child of ruby frame should either a rbc or a rtc"); + + const PseudoParentData& pseudoData = + sPseudoParentData[eTypeRubyBaseContainer]; + RefPtr<ComputedStyle> pseudoStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + pseudoData.mPseudoType, aParentFrame->Style()); + FrameConstructionItem* newItem = new (this) FrameConstructionItem( + &pseudoData.mFCData, + // Use the content of the parent frame + aParentFrame->GetContent(), pseudoStyle.forget(), true); + newItem->mIsAllInline = true; + newItem->mChildItems.SetParentHasNoShadowDOM(true); + iter.InsertItem(newItem); +} + +#ifdef DEBUG +/** + * Returns true iff aFrame should be wrapped in an anonymous flex/grid item, + * rather than being a direct child of aContainerFrame. + * + * NOTE: aContainerFrame must be a flex or grid container - this function is + * purely for sanity-checking the children of these container types. + * NOTE: See also NeedsAnonFlexOrGridItem(), for the non-debug version of this + * logic (which operates a bit earlier, on FCData instead of frames). + */ +static bool FrameWantsToBeInAnonymousItem(const nsIFrame* aContainerFrame, + const nsIFrame* aFrame) { + MOZ_ASSERT(aContainerFrame->IsFlexOrGridContainer() || + aContainerFrame->IsXULBoxFrame()); + + // Any line-participant frames (e.g. text) definitely want to be wrapped in + // an anonymous flex/grid item. + if (aFrame->IsFrameOfType(nsIFrame::eLineParticipant)) { + return true; + } + + // If the container is a -webkit-{inline-}box container, then placeholders + // also need to be wrapped, for compatibility. + if (IsFlexContainerForLegacyWebKitBox(aContainerFrame) && + aFrame->IsPlaceholderFrame()) { + return true; + } + + return false; +} +#endif + +static void VerifyGridFlexContainerChildren(nsIFrame* aParentFrame, + const nsFrameList& aChildren) { +#ifdef DEBUG + if (!aParentFrame->IsFlexOrGridContainer() && + !aParentFrame->IsXULBoxFrame()) { + return; + } + + bool prevChildWasAnonItem = false; + for (const nsIFrame* child : aChildren) { + MOZ_ASSERT(!FrameWantsToBeInAnonymousItem(aParentFrame, child), + "frame wants to be inside an anonymous item, but it isn't"); + if (IsAnonymousItem(child)) { + AssertAnonymousFlexOrGridItemParent(child, aParentFrame); + MOZ_ASSERT(!prevChildWasAnonItem, "two anon items in a row"); + nsIFrame* firstWrappedChild = child->PrincipalChildList().FirstChild(); + MOZ_ASSERT(firstWrappedChild, "anonymous item shouldn't be empty"); + prevChildWasAnonItem = true; + } else { + prevChildWasAnonItem = false; + } + } +#endif +} + +static bool FrameHasOnlyPlaceholderPrevSiblings(const nsIFrame* aFrame) { + // Check for prev siblings, ignoring placeholder frames. + MOZ_ASSERT(aFrame, "frame must not be null"); + const nsIFrame* prevSibling = aFrame; + do { + prevSibling = prevSibling->GetPrevSibling(); + } while (prevSibling && prevSibling->IsPlaceholderFrame()); + return !prevSibling; +} + +static bool FrameHasOnlyPlaceholderNextSiblings(const nsIFrame* aFrame) { + // Check for next siblings, ignoring placeholder frames. + MOZ_ASSERT(aFrame, "frame must not be null"); + const nsIFrame* nextSibling = aFrame; + do { + nextSibling = nextSibling->GetNextSibling(); + } while (nextSibling && nextSibling->IsPlaceholderFrame()); + return !nextSibling; +} + +static void SetPageValues(nsIFrame* const aFrame, + const nsAtom* const aAutoValue, + const nsAtom* const aStartValue, + const nsAtom* const aEndValue) { + MOZ_ASSERT(aAutoValue, "Auto page value should never be null"); + MOZ_ASSERT(aStartValue || aEndValue, "Should not have called with no values"); + nsIFrame::PageValues* pageValues = + aFrame->GetProperty(nsIFrame::PageValuesProperty()); + + if (aStartValue) { + if (aStartValue == aAutoValue) { + // If the page value struct already exists, set the start value to null + // to indicate the auto value. + if (pageValues) { + pageValues->mStartPageValue = nullptr; + } + } else { + // The start value is not auto, so we need to store it, creating the + // page values struct if it does not already exist. + if (!pageValues) { + pageValues = new nsIFrame::PageValues(); + aFrame->SetProperty(nsIFrame::PageValuesProperty(), pageValues); + } + pageValues->mStartPageValue = aStartValue; + } + } + if (aEndValue) { + if (aEndValue == aAutoValue) { + // If the page value struct already exists, set the end value to null + // to indicate the auto value. + if (pageValues) { + pageValues->mEndPageValue = nullptr; + } + } else { + // The end value is not auto, so we need to store it, creating the + // page values struct if it does not already exist. + if (!pageValues) { + pageValues = new nsIFrame::PageValues(); + aFrame->SetProperty(nsIFrame::PageValuesProperty(), pageValues); + } + pageValues->mEndPageValue = aEndValue; + } + } +} + +inline void nsCSSFrameConstructor::ConstructFramesFromItemList( + nsFrameConstructorState& aState, FrameConstructionItemList& aItems, + nsContainerFrame* aParentFrame, bool aParentIsWrapperAnonBox, + nsFrameList& aFrameList) { +#ifdef DEBUG + if (aParentFrame->StyleContent()->mContent.IsNone() && + StaticPrefs::layout_css_element_content_none_enabled()) { + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + MOZ_ASSERT(iter.item().mContent->IsInNativeAnonymousSubtree() || + iter.item().mComputedStyle->IsPseudoOrAnonBox()); + } + } + + // The assertion condition should match the logic in + // MaybePushFloatContainingBlock(). + MOZ_ASSERT(!(ShouldSuppressFloatingOfDescendants(aParentFrame) || + aParentFrame->IsFloatContainingBlock()) || + aState.mFloatCBCandidate == aParentFrame, + "Our caller or ProcessChildren()'s caller should call " + "MaybePushFloatContainingBlock() to handle the float containing " + "block candidate!"); + aState.mFloatCBCandidate = nullptr; +#endif + + // Ensure aParentIsWrapperAnonBox is correct. We _could_ compute it directly, + // but it would be a bit slow, which is why we pass it from callers, who have + // that information offhand in many cases. + MOZ_ASSERT(ParentIsWrapperAnonBox(aParentFrame) == aParentIsWrapperAnonBox); + + // Note: we explicitly exclude TableColGroupFrame because it doesn't + // have the FCDATA_IS_WRAPPER_ANON_BOX on pseudos so aParentIsWrapperAnonBox + // is false for such pseudos (see sPseudoParentData below). + if (!aParentIsWrapperAnonBox && aState.mHasRenderedLegend && + aParentFrame->GetContent()->IsHTMLElement(nsGkAtoms::fieldset) && + !aParentFrame->IsTableColGroupFrame()) { + DebugOnly<bool> found = false; + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + if (iter.item().mIsRenderedLegend) { + // This makes the rendered legend the first frame in the fieldset child + // list which makes keyboard traversal follow the visual order. + nsFieldSetFrame* fieldSetFrame = GetFieldSetFrameFor(aParentFrame); + nsFrameList renderedLegend; + ConstructFramesFromItem(aState, iter, fieldSetFrame, renderedLegend); + MOZ_ASSERT(renderedLegend.OnlyChild(), + "a rendered legend should have exactly one frame"); + fieldSetFrame->InsertFrames(FrameChildListID::Principal, nullptr, + nullptr, std::move(renderedLegend)); + FCItemIterator next = iter; + next.Next(); + iter.DeleteItemsTo(this, next); + found = true; + break; + } + } + MOZ_ASSERT(found, "should have found our rendered legend"); + } + + CreateNeededPseudoContainers(aState, aItems, aParentFrame); + CreateNeededAnonFlexOrGridItems(aState, aItems, aParentFrame); + CreateNeededPseudoInternalRubyBoxes(aState, aItems, aParentFrame); + CreateNeededPseudoSiblings(aState, aItems, aParentFrame); + + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + MOZ_ASSERT(!iter.item().mIsRenderedLegend, + "Only one item can be the rendered legend, " + "and it should've been handled above"); + NS_ASSERTION(iter.item().DesiredParentType() == GetParentType(aParentFrame), + "Needed pseudos didn't get created; expect bad things"); + ConstructFramesFromItem(aState, iter, aParentFrame, aFrameList); + } + + VerifyGridFlexContainerChildren(aParentFrame, aFrameList); + + // Calculate and propagate page-name values for each frame in the frame list. + // This will be affected by https://bugzilla.mozilla.org/1782597 + if (aState.mPresContext->IsPaginated() && + StaticPrefs::layout_css_named_pages_enabled() && + aParentFrame->IsBlockFrameOrSubclass()) { + // Set the start/end page values while iterating the frame list, to walk + // up the frame tree only once after iterating the frame list. + // This also avoids extra property lookups on these frames. + MOZ_ASSERT(aState.mAutoPageNameValue == aParentFrame->GetAutoPageValue(), + "aState.mAutoPageNameValue should have been equivalent to " + "the auto value stored on our parent frame."); + // Even though we store null for page values that equal the "auto" resolved + // value on frames, we always want startPageValue/endPageValue to be the + // actual atoms reflecting the start/end values. This is because when we + // propagate the values up the frame tree, we will need to compare them to + // the auto value for each ancestor. This value might be different than the + // auto value for this frame. + const nsAtom* startPageValue = nullptr; + const nsAtom* endPageValue = nullptr; + for (nsIFrame* f : aFrameList) { + if (f->IsPlaceholderFrame()) { + continue; + } + // Resolve auto against the parent frame's used page name, which has been + // determined and set on aState.mAutoPageNameValue. If this item is not + // block-level then we use the value that auto resolves to. + // + // This is to achieve the propagation behavior described in the spec: + // + // "A start page value and end page value is determined for each box as + // the value (if any) propagated from its first or last child box + // (respectively), else the used value on the box itself." + // + // "A child propagates its own start or end page value if and only if the + // page property applies to it." + // + // The page property only applies to "boxes that create class A break + // points". When taken together, this means that non block-level children + // do not propagate start/end page values, and instead we use "the used + // value on the box itself", the "box itself" being aParentFrame. This + // value has been determined and saved as aState.mAutoPageNameValue + // + // https://www.w3.org/TR/css-page-3/#using-named-pages + // https://www.w3.org/TR/css-break-3/#btw-blocks + const StylePageName& pageName = f->StylePage()->mPage; + const nsAtom* const pageNameAtom = + (pageName.IsPageName() && f->IsBlockOutside()) + ? pageName.AsPageName().AsAtom() + : aState.mAutoPageNameValue; + nsIFrame::PageValues* pageValues = + f->GetProperty(nsIFrame::PageValuesProperty()); + // If this frame has any children, it will already have had its page + // values set at this point. However, if no page values have been set, + // we must ensure that the appropriate PageValuesProperty value has been + // set. + // If the page name is equal to the auto value, then PageValuesProperty + // should remain null to indicate that the start/end values are both + // equal to the auto value. + if (pageNameAtom != aState.mAutoPageNameValue && !pageValues) { + pageValues = new nsIFrame::PageValues{pageNameAtom, pageNameAtom}; + f->SetProperty(nsIFrame::PageValuesProperty(), pageValues); + } + // We don't want to use GetStartPageValue() or GetEndPageValue(), as each + // requires a property lookup which we can avoid here. + if (!startPageValue) { + startPageValue = (pageValues && pageValues->mStartPageValue) + ? pageValues->mStartPageValue.get() + : aState.mAutoPageNameValue; + } + endPageValue = (pageValues && pageValues->mEndPageValue) + ? pageValues->mEndPageValue.get() + : aState.mAutoPageNameValue; + MOZ_ASSERT(startPageValue && endPageValue, + "Should have found start/end page value"); + } + MOZ_ASSERT(!startPageValue == !endPageValue, + "Should have set both or neither page values"); + if (startPageValue) { + // Walk up the frame tree from our parent frame, propagating start and + // end page values. + // As we go, if we find that, for a frame, we are not contributing one of + // the start/end page values, then our subtree will not contribute this + // value from that frame onward. startPageValue/endPageValue are set to + // null to indicate this. + // Stop iterating when we are not contributing either start or end + // values, when we hit the root frame (no parent), or when we find a + // frame that is not a block frame. + for (nsContainerFrame* ancestorFrame = aParentFrame; + (startPageValue || endPageValue) && ancestorFrame && + ancestorFrame->IsBlockFrameOrSubclass(); + ancestorFrame = ancestorFrame->GetParent()) { + MOZ_ASSERT(!ancestorFrame->GetPrevInFlow(), + "Should not have fragmentation yet"); + MOZ_ASSERT(ancestorFrame->mWasVisitedByAutoFrameConstructionPageName, + "Frame should have been visited by " + "AutoFrameConstructionPageName"); + { + // Get what the auto value is, based on this frame's parent. + // For the root frame, `auto` resolves to the empty atom. + const nsContainerFrame* const parent = ancestorFrame->GetParent(); + const nsAtom* const parentAuto = MOZ_LIKELY(parent) + ? parent->GetAutoPageValue() + : nsGkAtoms::_empty; + SetPageValues(ancestorFrame, parentAuto, startPageValue, + endPageValue); + } + // Once we stop contributing start/end values, we know there is a + // sibling subtree that contributed that value to our shared parent + // instead of our starting frame's subtree. This means once + // startPageValue/endPageValue becomes null, indicating that we are no + // longer contributing that page value, it should stay null and we no + // longer need to check for siblings in that direction. + if (startPageValue && + !FrameHasOnlyPlaceholderPrevSiblings(ancestorFrame)) { + startPageValue = nullptr; + } + if (endPageValue && + !FrameHasOnlyPlaceholderNextSiblings(ancestorFrame)) { + endPageValue = nullptr; + } + } + } + } + + if (aParentIsWrapperAnonBox) { + for (nsIFrame* f : aFrameList) { + f->SetParentIsWrapperAnonBox(); + } + } +} + +void nsCSSFrameConstructor::AddFCItemsForAnonymousContent( + nsFrameConstructorState& aState, nsContainerFrame* aFrame, + const nsTArray<nsIAnonymousContentCreator::ContentInfo>& aAnonymousItems, + FrameConstructionItemList& aItemsToConstruct, + const AutoFrameConstructionPageName&) { + for (const auto& info : aAnonymousItems) { + nsIContent* content = info.mContent; + // Gecko-styled nodes should have no pending restyle flags. + // Assert some things about this content + MOZ_ASSERT(!(content->GetFlags() & + (NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME)), + "Should not be marked as needing frames"); + MOZ_ASSERT(!content->GetPrimaryFrame(), "Should have no existing frame"); + MOZ_ASSERT(!content->IsComment() && !content->IsProcessingInstruction(), + "Why is someone creating garbage anonymous content"); + + // Make sure we eagerly performed the servo cascade when the anonymous + // nodes were created. + MOZ_ASSERT(!content->IsElement() || content->AsElement()->HasServoData()); + + RefPtr<ComputedStyle> computedStyle = ResolveComputedStyle(content); + + AddFrameConstructionItemsInternal(aState, content, aFrame, true, + computedStyle, {ItemFlag::AllowPageBreak}, + aItemsToConstruct); + } +} + +void nsCSSFrameConstructor::ProcessChildren( + nsFrameConstructorState& aState, nsIContent* aContent, + ComputedStyle* aComputedStyle, nsContainerFrame* aFrame, + const bool aCanHaveGeneratedContent, nsFrameList& aFrameList, + const bool aAllowBlockStyles, nsIFrame* aPossiblyLeafFrame) { + MOZ_ASSERT(aFrame, "Must have parent frame here"); + MOZ_ASSERT(aFrame->GetContentInsertionFrame() == aFrame, + "Parent frame in ProcessChildren should be its own " + "content insertion frame"); + + const uint32_t kMaxDepth = 2 * MAX_REFLOW_DEPTH; + static_assert(kMaxDepth <= UINT16_MAX, "mCurrentDepth type is too narrow"); + AutoRestore<uint16_t> savedDepth(mCurrentDepth); + if (mCurrentDepth != UINT16_MAX) { + ++mCurrentDepth; + } + + if (!aPossiblyLeafFrame) { + aPossiblyLeafFrame = aFrame; + } + + // XXXbz ideally, this would do all the pushing of various + // containing blocks as needed, so callers don't have to do it... + + // Check that our parent frame is a block before allowing ::first-letter/line. + // E.g. <button style="display:grid"> should not allow it. + const bool allowFirstPseudos = + aAllowBlockStyles && aFrame->IsBlockFrameOrSubclass(); + bool haveFirstLetterStyle = false, haveFirstLineStyle = false; + if (allowFirstPseudos) { + ShouldHaveSpecialBlockStyle(aContent, aComputedStyle, &haveFirstLetterStyle, + &haveFirstLineStyle); + } + + AutoFrameConstructionItemList itemsToConstruct(this); + AutoFrameConstructionPageName pageNameTracker(aState, aFrame); + + // If we have first-letter or first-line style then frames can get + // moved around so don't set these flags. + if (allowFirstPseudos && !haveFirstLetterStyle && !haveFirstLineStyle) { + itemsToConstruct.SetLineBoundaryAtStart(true); + itemsToConstruct.SetLineBoundaryAtEnd(true); + } + + // Create any anonymous frames we need here. + AutoTArray<nsIAnonymousContentCreator::ContentInfo, 4> anonymousItems; + GetAnonymousContent(aContent, aPossiblyLeafFrame, anonymousItems); +#ifdef DEBUG + for (uint32_t i = 0; i < anonymousItems.Length(); ++i) { + MOZ_ASSERT(anonymousItems[i].mContent->IsRootOfNativeAnonymousSubtree(), + "Content should know it's an anonymous subtree"); + } +#endif + AddFCItemsForAnonymousContent(aState, aFrame, anonymousItems, + itemsToConstruct, pageNameTracker); + + nsBlockFrame* listItem = nullptr; + bool isOutsideMarker = false; + if (!aPossiblyLeafFrame->IsLeaf()) { + // :before/:after content should have the same style parent as normal kids. + // + // Note that we don't use this style for looking up things like special + // block styles because in some cases involving table pseudo-frames it has + // nothing to do with the parent frame's desired behavior. + auto* styleParentFrame = + nsIFrame::CorrectStyleParentFrame(aFrame, PseudoStyleType::NotPseudo); + ComputedStyle* computedStyle = styleParentFrame->Style(); + + if (aCanHaveGeneratedContent) { + if (computedStyle->StyleDisplay()->IsListItem() && + (listItem = do_QueryFrame(aFrame)) && + !styleParentFrame->IsFieldSetFrame()) { + isOutsideMarker = computedStyle->StyleList()->mListStylePosition == + StyleListStylePosition::Outside; + ItemFlags extraFlags; + if (isOutsideMarker) { + extraFlags += ItemFlag::IsForOutsideMarker; + } + CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(), + *computedStyle, PseudoStyleType::marker, + itemsToConstruct, extraFlags); + } + // Probe for generated content before + CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(), + *computedStyle, PseudoStyleType::before, + itemsToConstruct); + } + + const bool addChildItems = MOZ_LIKELY(mCurrentDepth < kMaxDepth); + if (!addChildItems) { + NS_WARNING("ProcessChildren max depth exceeded"); + } + + FlattenedChildIterator iter(aContent); + const InsertionPoint insertion(aFrame, aContent); + for (nsIContent* child = iter.GetNextChild(); child; + child = iter.GetNextChild()) { + MOZ_ASSERT(insertion.mContainer == GetInsertionPoint(child).mContainer, + "GetInsertionPoint should agree with us"); + if (addChildItems) { + AddFrameConstructionItems(aState, child, iter.ShadowDOMInvolved(), + *computedStyle, insertion, itemsToConstruct); + } else { + ClearLazyBits(child, child->GetNextSibling()); + } + } + itemsToConstruct.SetParentHasNoShadowDOM(!iter.ShadowDOMInvolved()); + + if (aCanHaveGeneratedContent) { + // Probe for generated content after + CreateGeneratedContentItem(aState, aFrame, *aContent->AsElement(), + *computedStyle, PseudoStyleType::after, + itemsToConstruct); + } + } else { + ClearLazyBits(aContent->GetFirstChild(), nullptr); + } + + ConstructFramesFromItemList(aState, itemsToConstruct, aFrame, + /* aParentIsWrapperAnonBox = */ false, + aFrameList); + + NS_ASSERTION(!allowFirstPseudos || !aFrame->IsXULBoxFrame(), + "can't be both block and box"); + + if (listItem) { + if (auto* markerFrame = nsLayoutUtils::GetMarkerFrame(aContent)) { + for (auto* childFrame : aFrameList) { + if (markerFrame == childFrame) { + if (isOutsideMarker) { + // SetMarkerFrameForListItem will add childFrame to the + // FrameChildListID::Bullet + aFrameList.RemoveFrame(childFrame); + auto* grandParent = listItem->GetParent()->GetParent(); + if (listItem->Style()->GetPseudoType() == + PseudoStyleType::columnContent && + grandParent && grandParent->IsColumnSetWrapperFrame()) { + listItem = do_QueryFrame(grandParent); + MOZ_ASSERT(listItem, + "ColumnSetWrapperFrame is expected to be " + "a nsBlockFrame subclass"); + childFrame->SetParent(listItem); + } + } + listItem->SetMarkerFrameForListItem(childFrame); + MOZ_ASSERT(listItem->HasAnyStateBits( + NS_BLOCK_FRAME_HAS_OUTSIDE_MARKER) == isOutsideMarker); +#ifdef ACCESSIBILITY + if (nsAccessibilityService* accService = GetAccService()) { + auto* marker = markerFrame->GetContent(); + accService->ContentRangeInserted(mPresShell, marker, nullptr); + } +#endif + break; + } + } + } + } + + if (haveFirstLetterStyle) { + WrapFramesInFirstLetterFrame(aFrame, aFrameList); + } + if (haveFirstLineStyle) { + WrapFramesInFirstLineFrame(aState, aContent, aFrame, nullptr, aFrameList); + } +} + +//---------------------------------------------------------------------- + +// Support for :first-line style + +// Special routine to handle placing a list of frames into a block +// frame that has first-line style. The routine ensures that the first +// collection of inline frames end up in a first-line frame. +// NOTE: aState may have containing block information related to a +// different part of the frame tree than where the first line occurs. +// In particular aState may be set up for where ContentInserted or +// ContentAppended is inserting content, which may be some +// non-first-in-flow continuation of the block to which the first-line +// belongs. So this function needs to be careful about how it uses +// aState. +void nsCSSFrameConstructor::WrapFramesInFirstLineFrame( + nsFrameConstructorState& aState, nsIContent* aBlockContent, + nsContainerFrame* aBlockFrame, nsFirstLineFrame* aLineFrame, + nsFrameList& aFrameList) { + // Extract any initial inline frames from aFrameList so we can put them + // in the first-line. + nsFrameList firstLineChildren = + aFrameList.Split([](nsIFrame* f) { return !f->IsInlineOutside(); }); + + if (firstLineChildren.IsEmpty()) { + // Nothing is supposed to go into the first-line; nothing to do + return; + } + + if (!aLineFrame) { + // Create line frame + ComputedStyle* parentStyle = nsIFrame::CorrectStyleParentFrame( + aBlockFrame, PseudoStyleType::firstLine) + ->Style(); + RefPtr<ComputedStyle> firstLineStyle = + GetFirstLineStyle(aBlockContent, parentStyle); + + aLineFrame = NS_NewFirstLineFrame(mPresShell, firstLineStyle); + + // Initialize the line frame + InitAndRestoreFrame(aState, aBlockContent, aBlockFrame, aLineFrame); + + // The lineFrame will be the block's first child; the rest of the + // frame list (after lastInlineFrame) will be the second and + // subsequent children; insert lineFrame into aFrameList. + aFrameList.InsertFrame(nullptr, nullptr, aLineFrame); + + NS_ASSERTION(aLineFrame->Style() == firstLineStyle, + "Bogus style on line frame"); + } + + // Give the inline frames to the lineFrame <b>after</b> reparenting them + ReparentFrames(this, aLineFrame, firstLineChildren, true); + if (aLineFrame->PrincipalChildList().IsEmpty() && + aLineFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + aLineFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(firstLineChildren)); + } else { + AppendFrames(aLineFrame, FrameChildListID::Principal, + std::move(firstLineChildren)); + } +} + +// Special routine to handle appending a new frame to a block frame's +// child list. Takes care of placing the new frame into the right +// place when first-line style is present. +void nsCSSFrameConstructor::AppendFirstLineFrames( + nsFrameConstructorState& aState, nsIContent* aBlockContent, + nsContainerFrame* aBlockFrame, nsFrameList& aFrameList) { + // It's possible that aBlockFrame needs to have a first-line frame + // created because it doesn't currently have any children. + const nsFrameList& blockKids = aBlockFrame->PrincipalChildList(); + if (blockKids.IsEmpty()) { + WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, nullptr, + aFrameList); + return; + } + + // Examine the last block child - if it's a first-line frame then + // appended frames need special treatment. + nsIFrame* lastBlockKid = blockKids.LastChild(); + if (!lastBlockKid->IsLineFrame()) { + // No first-line frame at the end of the list, therefore there is + // an intervening block between any first-line frame the frames + // we are appending. Therefore, we don't need any special + // treatment of the appended frames. + return; + } + + nsFirstLineFrame* lineFrame = static_cast<nsFirstLineFrame*>(lastBlockKid); + WrapFramesInFirstLineFrame(aState, aBlockContent, aBlockFrame, lineFrame, + aFrameList); +} + +void nsCSSFrameConstructor::CheckForFirstLineInsertion( + nsIFrame* aParentFrame, nsFrameList& aFrameList) { + MOZ_ASSERT(aParentFrame->Style()->HasPseudoElementData(), + "Why were we called?"); + + if (aFrameList.IsEmpty()) { + // Happens often enough, with the caption stuff. No need to do the ancestor + // walk here. + return; + } + + class RestyleManager* restyleManager = RestyleManager(); + + // Check whether there's a ::first-line on the path up from aParentFrame. + // Note that we can't stop until we've run out of ancestors with + // pseudo-element data, because the first-letter might be somewhere way up the + // tree; in particular it might be past our containing block. + nsIFrame* ancestor = aParentFrame; + while (ancestor) { + if (!ancestor->Style()->HasPseudoElementData()) { + // We know we won't find a ::first-line now. + return; + } + + if (!ancestor->IsLineFrame()) { + ancestor = ancestor->GetParent(); + continue; + } + + if (!ancestor->Style()->IsPseudoElement()) { + // This is a continuation lineframe, not the first line; no need to do + // anything to the styles. + return; + } + + // Fix up the styles of aFrameList for ::first-line. + for (nsIFrame* f : aFrameList) { + restyleManager->ReparentComputedStyleForFirstLine(f); + } + return; + } +} + +//---------------------------------------------------------------------- + +// First-letter support + +// Determine how many characters in the text fragment apply to the +// first letter +static int32_t FirstLetterCount(const nsTextFragment* aFragment) { + int32_t count = 0; + int32_t firstLetterLength = 0; + + const uint32_t n = aFragment->GetLength(); + for (uint32_t i = 0; i < n; i++) { + const char16_t ch = aFragment->CharAt(i); + // FIXME: take content language into account when deciding whitespace. + if (dom::IsSpaceCharacter(ch)) { + if (firstLetterLength) { + break; + } + count++; + continue; + } + // XXX I18n + if ((ch == '\'') || (ch == '\"')) { + if (firstLetterLength) { + break; + } + // keep looping + firstLetterLength = 1; + } else { + count++; + break; + } + } + + return count; +} + +static bool NeedFirstLetterContinuation(Text* aText) { + MOZ_ASSERT(aText, "null ptr"); + int32_t flc = FirstLetterCount(&aText->TextFragment()); + int32_t tl = aText->TextDataLength(); + return flc < tl; +} + +static bool IsFirstLetterContent(Text* aText) { + return aText->TextDataLength() && !aText->TextIsOnlyWhitespace(); +} + +/** + * Create a letter frame, only make it a floating frame. + */ +nsFirstLetterFrame* nsCSSFrameConstructor::CreateFloatingLetterFrame( + nsFrameConstructorState& aState, Text* aTextContent, nsIFrame* aTextFrame, + nsContainerFrame* aParentFrame, ComputedStyle* aParentStyle, + ComputedStyle* aComputedStyle, nsFrameList& aResult) { + MOZ_ASSERT(aParentStyle); + + nsFirstLetterFrame* letterFrame = + NS_NewFirstLetterFrame(mPresShell, aComputedStyle); + // We don't want to use a text content for a non-text frame (because we want + // its primary frame to be a text frame). + nsIContent* letterContent = aParentFrame->GetContent(); + nsContainerFrame* containingBlock = + aState.GetGeometricParent(*aComputedStyle->StyleDisplay(), aParentFrame); + InitAndRestoreFrame(aState, letterContent, containingBlock, letterFrame); + + // Init the text frame to refer to the letter frame. + // + // Make sure we get a proper style for it (the one passed in is for the letter + // frame and will have the float property set on it; the text frame shouldn't + // have that set). + ServoStyleSet* styleSet = mPresShell->StyleSet(); + RefPtr<ComputedStyle> textSC = + styleSet->ResolveStyleForText(aTextContent, aComputedStyle); + aTextFrame->SetComputedStyleWithoutNotification(textSC); + InitAndRestoreFrame(aState, aTextContent, letterFrame, aTextFrame); + + // And then give the text frame to the letter frame + SetInitialSingleChild(letterFrame, aTextFrame); + + // See if we will need to continue the text frame (does it contain + // more than just the first-letter text or not?) If it does, then we + // create (in advance) a continuation frame for it. + nsIFrame* nextTextFrame = nullptr; + if (NeedFirstLetterContinuation(aTextContent)) { + // Create continuation + nextTextFrame = CreateContinuingFrame(aTextFrame, aParentFrame); + RefPtr<ComputedStyle> newSC = + styleSet->ResolveStyleForText(aTextContent, aParentStyle); + nextTextFrame->SetComputedStyle(newSC); + } + + NS_ASSERTION(aResult.IsEmpty(), "aResult should be an empty nsFrameList!"); + // Put the new float before any of the floats in the block we're doing + // first-letter for, that is, before any floats whose parent is + // containingBlock. + nsIFrame* prevSibling = nullptr; + for (nsIFrame* f : aState.mFloatedList) { + if (f->GetParent() == containingBlock) { + break; + } + prevSibling = f; + } + + aState.AddChild(letterFrame, aResult, letterContent, aParentFrame, false, + true, true, prevSibling); + + if (nextTextFrame) { + aResult.AppendFrame(nullptr, nextTextFrame); + } + + return letterFrame; +} + +/** + * Create a new letter frame for aTextFrame. The letter frame will be + * a child of aParentFrame. + */ +void nsCSSFrameConstructor::CreateLetterFrame( + nsContainerFrame* aBlockFrame, nsContainerFrame* aBlockContinuation, + Text* aTextContent, nsContainerFrame* aParentFrame, nsFrameList& aResult) { + NS_ASSERTION(aBlockFrame->IsBlockFrameOrSubclass(), "Not a block frame?"); + + // Get a ComputedStyle for the first-letter-frame. + // + // Keep this in sync with nsBlockFrame::UpdatePseudoElementStyles. + nsIFrame* parentFrame = nsIFrame::CorrectStyleParentFrame( + aParentFrame, PseudoStyleType::firstLetter); + + ComputedStyle* parentComputedStyle = parentFrame->Style(); + + // Use content from containing block so that we can actually + // find a matching style rule. + nsIContent* blockContent = aBlockFrame->GetContent(); + + // Create first-letter style rule + RefPtr<ComputedStyle> sc = + GetFirstLetterStyle(blockContent, parentComputedStyle); + + if (sc) { + if (parentFrame->IsLineFrame()) { + nsIFrame* parentIgnoringFirstLine = nsIFrame::CorrectStyleParentFrame( + aBlockFrame, PseudoStyleType::firstLetter); + + sc = mPresShell->StyleSet()->ReparentComputedStyle( + sc, parentComputedStyle, parentIgnoringFirstLine->Style(), + parentComputedStyle, blockContent->AsElement()); + } + + RefPtr<ComputedStyle> textSC = + mPresShell->StyleSet()->ResolveStyleForText(aTextContent, sc); + + // Create a new text frame (the original one will be discarded) + // pass a temporary stylecontext, the correct one will be set + // later. Start off by unsetting the primary frame for + // aTextContent, so it's no longer pointing to the to-be-destroyed + // frame. + // XXXbz it would be really nice to destroy the old frame _first_, + // then create the new one, so we could avoid this hack. + aTextContent->SetPrimaryFrame(nullptr); + nsIFrame* textFrame = NS_NewTextFrame(mPresShell, textSC); + + NS_ASSERTION(aBlockContinuation == GetFloatContainingBlock(aParentFrame), + "Containing block is confused"); + nsFrameConstructorState state( + mPresShell, GetAbsoluteContainingBlock(aParentFrame, FIXED_POS), + GetAbsoluteContainingBlock(aParentFrame, ABS_POS), aBlockContinuation); + + // Create the right type of first-letter frame + const nsStyleDisplay* display = sc->StyleDisplay(); + nsFirstLetterFrame* letterFrame; + if (display->IsFloatingStyle() && + !SVGUtils::IsInSVGTextSubtree(aParentFrame)) { + // Make a floating first-letter frame + letterFrame = CreateFloatingLetterFrame(state, aTextContent, textFrame, + aParentFrame, parentComputedStyle, + sc, aResult); + } else { + // Make an inflow first-letter frame + letterFrame = NS_NewFirstLetterFrame(mPresShell, sc); + + // Initialize the first-letter-frame. We don't want to use a text + // content for a non-text frame (because we want its primary frame to + // be a text frame). + nsIContent* letterContent = aParentFrame->GetContent(); + letterFrame->Init(letterContent, aParentFrame, nullptr); + + InitAndRestoreFrame(state, aTextContent, letterFrame, textFrame); + + SetInitialSingleChild(letterFrame, textFrame); + aResult.Clear(); + aResult.AppendFrame(nullptr, letterFrame); + NS_ASSERTION(!aBlockFrame->GetPrevContinuation(), + "should have the first continuation here"); + aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD); + } + MOZ_ASSERT( + !aBlockFrame->GetPrevContinuation(), + "Setting up a first-letter frame on a non-first block continuation?"); + auto parent = + static_cast<nsContainerFrame*>(aParentFrame->FirstContinuation()); + if (MOZ_UNLIKELY(parent->IsLineFrame())) { + parent = static_cast<nsContainerFrame*>( + parent->GetParent()->FirstContinuation()); + } + parent->SetHasFirstLetterChild(); + aBlockFrame->SetProperty(nsContainerFrame::FirstLetterProperty(), + letterFrame); + aTextContent->SetPrimaryFrame(textFrame); + } +} + +void nsCSSFrameConstructor::WrapFramesInFirstLetterFrame( + nsContainerFrame* aBlockFrame, nsFrameList& aBlockFrames) { + aBlockFrame->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE); + + nsContainerFrame* parentFrame = nullptr; + nsIFrame* textFrame = nullptr; + nsIFrame* prevFrame = nullptr; + nsFrameList letterFrames; + bool stopLooking = false; + WrapFramesInFirstLetterFrame( + aBlockFrame, aBlockFrame, aBlockFrame, aBlockFrames.FirstChild(), + &parentFrame, &textFrame, &prevFrame, letterFrames, &stopLooking); + if (parentFrame) { + if (parentFrame == aBlockFrame) { + // Take textFrame out of the block's frame list and substitute the + // letter frame(s) instead. + aBlockFrames.DestroyFrame(textFrame); + aBlockFrames.InsertFrames(nullptr, prevFrame, std::move(letterFrames)); + } else { + // Take the old textFrame out of the inline parent's child list + RemoveFrame(FrameChildListID::Principal, textFrame); + + // Insert in the letter frame(s) + parentFrame->InsertFrames(FrameChildListID::Principal, prevFrame, nullptr, + std::move(letterFrames)); + } + } +} + +void nsCSSFrameConstructor::WrapFramesInFirstLetterFrame( + nsContainerFrame* aBlockFrame, nsContainerFrame* aBlockContinuation, + nsContainerFrame* aParentFrame, nsIFrame* aParentFrameList, + nsContainerFrame** aModifiedParent, nsIFrame** aTextFrame, + nsIFrame** aPrevFrame, nsFrameList& aLetterFrames, bool* aStopLooking) { + nsIFrame* prevFrame = nullptr; + nsIFrame* frame = aParentFrameList; + + // This loop attempts to implement "Finding the First Letter": + // https://drafts.csswg.org/css-pseudo-4/#application-in-css + // FIXME: we don't handle nested blocks correctly yet though (bug 214004) + while (frame) { + nsIFrame* nextFrame = frame->GetNextSibling(); + + // Skip all ::markers and placeholders. + if (frame->Style()->GetPseudoType() == PseudoStyleType::marker || + frame->IsPlaceholderFrame()) { + prevFrame = frame; + frame = nextFrame; + continue; + } + LayoutFrameType frameType = frame->Type(); + if (LayoutFrameType::Text == frameType) { + // Wrap up first-letter content in a letter frame + Text* textContent = frame->GetContent()->AsText(); + if (IsFirstLetterContent(textContent)) { + // Create letter frame to wrap up the text + CreateLetterFrame(aBlockFrame, aBlockContinuation, textContent, + aParentFrame, aLetterFrames); + + // Provide adjustment information for parent + *aModifiedParent = aParentFrame; + *aTextFrame = frame; + *aPrevFrame = prevFrame; + *aStopLooking = true; + return; + } + } else if (IsInlineFrame(frame) && frameType != LayoutFrameType::Br) { + nsIFrame* kids = frame->PrincipalChildList().FirstChild(); + WrapFramesInFirstLetterFrame(aBlockFrame, aBlockContinuation, + static_cast<nsContainerFrame*>(frame), kids, + aModifiedParent, aTextFrame, aPrevFrame, + aLetterFrames, aStopLooking); + if (*aStopLooking) { + return; + } + } else { + // This will stop us looking to create more letter frames. For + // example, maybe the frame-type is "letterFrame" or + // "placeholderFrame". This keeps us from creating extra letter + // frames, and also prevents us from creating letter frames when + // the first real content child of a block is not text (e.g. an + // image, hr, etc.) + *aStopLooking = true; + break; + } + + prevFrame = frame; + frame = nextFrame; + } +} + +static nsIFrame* FindFirstLetterFrame(nsIFrame* aFrame, + FrameChildListID aListID) { + for (nsIFrame* f : aFrame->GetChildList(aListID)) { + if (f->IsLetterFrame()) { + return f; + } + } + return nullptr; +} + +static void ClearHasFirstLetterChildFrom(nsContainerFrame* aParentFrame) { + MOZ_ASSERT(aParentFrame); + auto* parent = + static_cast<nsContainerFrame*>(aParentFrame->FirstContinuation()); + if (MOZ_UNLIKELY(parent->IsLineFrame())) { + MOZ_ASSERT(!parent->HasFirstLetterChild()); + parent = static_cast<nsContainerFrame*>( + parent->GetParent()->FirstContinuation()); + } + MOZ_ASSERT(parent->HasFirstLetterChild()); + parent->ClearHasFirstLetterChild(); +} + +void nsCSSFrameConstructor::RemoveFloatingFirstLetterFrames( + PresShell* aPresShell, nsIFrame* aBlockFrame) { + // Look for the first letter frame on the FrameChildListID::Float, then + // FrameChildListID::PushedFloats. + nsIFrame* floatFrame = + ::FindFirstLetterFrame(aBlockFrame, FrameChildListID::Float); + if (!floatFrame) { + floatFrame = + ::FindFirstLetterFrame(aBlockFrame, FrameChildListID::PushedFloats); + if (!floatFrame) { + return; + } + } + + // Take the text frame away from the letter frame (so it isn't + // destroyed when we destroy the letter frame). + nsIFrame* textFrame = floatFrame->PrincipalChildList().FirstChild(); + if (!textFrame) { + return; + } + + // Discover the placeholder frame for the letter frame + nsPlaceholderFrame* placeholderFrame = floatFrame->GetPlaceholderFrame(); + if (!placeholderFrame) { + // Somethings really wrong + return; + } + nsContainerFrame* parentFrame = placeholderFrame->GetParent(); + if (!parentFrame) { + // Somethings really wrong + return; + } + + ClearHasFirstLetterChildFrom(parentFrame); + + // Create a new text frame with the right style that maps all of the content + // that was previously part of the letter frame (and probably continued + // elsewhere). + ComputedStyle* parentSC = parentFrame->Style(); + nsIContent* textContent = textFrame->GetContent(); + if (!textContent) { + return; + } + RefPtr<ComputedStyle> newSC = + aPresShell->StyleSet()->ResolveStyleForText(textContent, parentSC); + nsIFrame* newTextFrame = NS_NewTextFrame(aPresShell, newSC); + newTextFrame->Init(textContent, parentFrame, nullptr); + + // Destroy the old text frame's continuations (the old text frame + // will be destroyed when its letter frame is destroyed). + nsIFrame* frameToDelete = textFrame->LastContinuation(); + while (frameToDelete != textFrame) { + nsIFrame* nextFrameToDelete = frameToDelete->GetPrevContinuation(); + RemoveFrame(FrameChildListID::Principal, frameToDelete); + frameToDelete = nextFrameToDelete; + } + + nsIFrame* prevSibling = placeholderFrame->GetPrevSibling(); + + // Now that everything is set... +#ifdef NOISY_FIRST_LETTER + printf( + "RemoveFloatingFirstLetterFrames: textContent=%p oldTextFrame=%p " + "newTextFrame=%p\n", + textContent.get(), textFrame, newTextFrame); +#endif + + // Remove placeholder frame and the float + RemoveFrame(FrameChildListID::Principal, placeholderFrame); + + // Now that the old frames are gone, we can start pointing to our + // new primary frame. + textContent->SetPrimaryFrame(newTextFrame); + + // Wallpaper bug 822910. + bool offsetsNeedFixing = prevSibling && prevSibling->IsTextFrame(); + if (offsetsNeedFixing) { + prevSibling->AddStateBits(TEXT_OFFSETS_NEED_FIXING); + } + + // Insert text frame in its place + InsertFrames(parentFrame, FrameChildListID::Principal, prevSibling, + nsFrameList(newTextFrame, newTextFrame)); + + if (offsetsNeedFixing) { + prevSibling->RemoveStateBits(TEXT_OFFSETS_NEED_FIXING); + } +} + +void nsCSSFrameConstructor::RemoveFirstLetterFrames( + PresShell* aPresShell, nsContainerFrame* aFrame, + nsContainerFrame* aBlockFrame, bool* aStopLooking) { + nsIFrame* prevSibling = nullptr; + nsIFrame* kid = aFrame->PrincipalChildList().FirstChild(); + + while (kid) { + if (kid->IsLetterFrame()) { + ClearHasFirstLetterChildFrom(aFrame); + nsIFrame* textFrame = kid->PrincipalChildList().FirstChild(); + if (!textFrame) { + break; + } + + // Create a new textframe + ComputedStyle* parentSC = aFrame->Style(); + if (!parentSC) { + break; + } + nsIContent* textContent = textFrame->GetContent(); + if (!textContent) { + break; + } + RefPtr<ComputedStyle> newSC = + aPresShell->StyleSet()->ResolveStyleForText(textContent, parentSC); + textFrame = NS_NewTextFrame(aPresShell, newSC); + textFrame->Init(textContent, aFrame, nullptr); + + // Next rip out the kid and replace it with the text frame + RemoveFrame(FrameChildListID::Principal, kid); + + // Now that the old frames are gone, we can start pointing to our + // new primary frame. + textContent->SetPrimaryFrame(textFrame); + + // Wallpaper bug 822910. + bool offsetsNeedFixing = prevSibling && prevSibling->IsTextFrame(); + if (offsetsNeedFixing) { + prevSibling->AddStateBits(TEXT_OFFSETS_NEED_FIXING); + } + + // Insert text frame in its place + InsertFrames(aFrame, FrameChildListID::Principal, prevSibling, + nsFrameList(textFrame, textFrame)); + + if (offsetsNeedFixing) { + prevSibling->RemoveStateBits(TEXT_OFFSETS_NEED_FIXING); + } + + *aStopLooking = true; + NS_ASSERTION(!aBlockFrame->GetPrevContinuation(), + "should have the first continuation here"); + aBlockFrame->RemoveStateBits(NS_BLOCK_HAS_FIRST_LETTER_CHILD); + break; + } else if (IsInlineFrame(kid)) { + nsContainerFrame* kidAsContainerFrame = do_QueryFrame(kid); + if (kidAsContainerFrame) { + // Look inside child inline frame for the letter frame. + RemoveFirstLetterFrames(aPresShell, kidAsContainerFrame, aBlockFrame, + aStopLooking); + if (*aStopLooking) { + break; + } + } + } + prevSibling = kid; + kid = kid->GetNextSibling(); + } +} + +void nsCSSFrameConstructor::RemoveLetterFrames(PresShell* aPresShell, + nsContainerFrame* aBlockFrame) { + aBlockFrame = + static_cast<nsContainerFrame*>(aBlockFrame->FirstContinuation()); + aBlockFrame->RemoveProperty(nsContainerFrame::FirstLetterProperty()); + nsContainerFrame* continuation = aBlockFrame; + + bool stopLooking = false; + do { + RemoveFloatingFirstLetterFrames(aPresShell, continuation); + RemoveFirstLetterFrames(aPresShell, continuation, aBlockFrame, + &stopLooking); + if (stopLooking) { + break; + } + continuation = + static_cast<nsContainerFrame*>(continuation->GetNextContinuation()); + } while (continuation); +} + +// Fixup the letter frame situation for the given block +void nsCSSFrameConstructor::RecoverLetterFrames(nsContainerFrame* aBlockFrame) { + aBlockFrame = + static_cast<nsContainerFrame*>(aBlockFrame->FirstContinuation()); + nsContainerFrame* continuation = aBlockFrame; + + nsContainerFrame* parentFrame = nullptr; + nsIFrame* textFrame = nullptr; + nsIFrame* prevFrame = nullptr; + nsFrameList letterFrames; + bool stopLooking = false; + do { + // XXX shouldn't this bit be set already (bug 408493), assert instead? + continuation->AddStateBits(NS_BLOCK_HAS_FIRST_LETTER_STYLE); + WrapFramesInFirstLetterFrame( + aBlockFrame, continuation, continuation, + continuation->PrincipalChildList().FirstChild(), &parentFrame, + &textFrame, &prevFrame, letterFrames, &stopLooking); + if (stopLooking) { + break; + } + continuation = + static_cast<nsContainerFrame*>(continuation->GetNextContinuation()); + } while (continuation); + + if (parentFrame) { + // Take the old textFrame out of the parent's child list + RemoveFrame(FrameChildListID::Principal, textFrame); + + // Insert in the letter frame(s) + parentFrame->InsertFrames(FrameChildListID::Principal, prevFrame, nullptr, + std::move(letterFrames)); + } +} + +//---------------------------------------------------------------------- + +void nsCSSFrameConstructor::ConstructBlock( + nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame, nsContainerFrame* aContentParentFrame, + ComputedStyle* aComputedStyle, nsContainerFrame** aNewFrame, + nsFrameList& aFrameList, nsIFrame* aPositionedFrameForAbsPosContainer) { + // clang-format off + // + // If a block frame is in a multi-column subtree, its children may need to + // be chopped into runs of blocks containing column-spans and runs of + // blocks containing no column-spans. Each run containing column-spans + // will be wrapped by an anonymous block. See CreateColumnSpanSiblings() for + // the implementation. + // + // If a block frame is a multi-column container, its children will need to + // be processed as above. Moreover, it creates a ColumnSetWrapperFrame as + // its outermost frame, and its children which have no + // -moz-column-span-wrapper pseudo will be wrapped in ColumnSetFrames. See + // FinishBuildingColumns() for the implementation. + // + // The multi-column subtree maintains the following invariants: + // + // 1) All the frames have the frame state bit + // NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR set, except for top-level + // ColumnSetWrapperFrame and those children in the column-span subtrees. + // + // 2) The first and last frame under ColumnSetWrapperFrame are always + // ColumnSetFrame. + // + // 3) ColumnSetFrames are linked together as continuations. + // + // 4) Those column-span wrappers are *not* linked together with themselves nor + // with the original block frame. The continuation chain consists of the + // original block frame and the original block's continuations wrapping + // non-column-spans. + // + // For example, this HTML + // <div id="x" style="column-count: 2;"> + // <div style="column-span: all">a</div> + // <div id="y"> + // b + // <div style="column-span: all">c</div> + // <div style="column-span: all">d</div> + // e + // </div> + // </div> + // <div style="column-span: all">f</div> + // + // yields the following frame tree. + // + // A) ColumnSetWrapper (original style) + // B) ColumnSet (-moz-column-set) <-- always created by BeginBuildingColumns + // C) Block (-moz-column-content) + // D) Block (-moz-column-span-wrapper, created by x) + // E) Block (div) + // F) Text ("a") + // G) ColumnSet (-moz-column-set) + // H) Block (-moz-column-content, created by x) + // I) Block (div, y) + // J) Text ("b") + // K) Block (-moz-column-span-wrapper, created by x) + // L) Block (-moz-column-span-wrapper, created by y) + // M) Block (div, new BFC) + // N) Text ("c") + // O) Block (div, new BFC) + // P) Text ("d") + // Q) ColumnSet (-moz-column-set) + // R) Block (-moz-column-content, created by x) + // S) Block (div, y) + // T) Text ("e") + // U) Block (div, new BFC) <-- not in multi-column hierarchy + // V) Text ("f") + // + // ColumnSet linkage described in 3): B -> G -> Q + // + // Block linkage described in 4): C -> H -> R and I -> S + // + // clang-format on + + nsBlockFrame* blockFrame = do_QueryFrame(*aNewFrame); + MOZ_ASSERT(blockFrame && blockFrame->IsBlockFrame(), "not a block frame?"); + + // Create column hierarchy if necessary. + const bool needsColumn = + aComputedStyle->StyleColumn()->IsColumnContainerStyle(); + if (needsColumn) { + *aNewFrame = BeginBuildingColumns(aState, aContent, aParentFrame, + blockFrame, aComputedStyle); + + if (aPositionedFrameForAbsPosContainer == blockFrame) { + aPositionedFrameForAbsPosContainer = *aNewFrame; + } + } else { + // No need to create column hierarchy. Initialize block frame. + blockFrame->SetComputedStyleWithoutNotification(aComputedStyle); + InitAndRestoreFrame(aState, aContent, aParentFrame, blockFrame); + } + + aState.AddChild(*aNewFrame, aFrameList, aContent, + aContentParentFrame ? aContentParentFrame : aParentFrame); + if (!mRootElementFrame) { + // The frame we're constructing will be the root element frame. + SetRootElementFrameAndConstructCanvasAnonContent(*aNewFrame, aState, + aFrameList); + } + + // We should make the outer frame be the absolute containing block, + // if one is required. We have to do this because absolute + // positioning must be computed with respect to the CSS dimensions + // of the element, which are the dimensions of the outer block. But + // we can't really do that because only blocks can have absolute + // children. So use the block and try to compensate with hacks + // in nsBlockFrame::CalculateContainingBlockSizeForAbsolutes. + nsFrameConstructorSaveState absoluteSaveState; + (*aNewFrame)->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (aPositionedFrameForAbsPosContainer) { + aState.PushAbsoluteContainingBlock( + *aNewFrame, aPositionedFrameForAbsPosContainer, absoluteSaveState); + } + + nsFrameConstructorSaveState floatSaveState; + aState.MaybePushFloatContainingBlock(blockFrame, floatSaveState); + + if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) && + !ShouldSuppressColumnSpanDescendants(aParentFrame)) { + blockFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + } + + // Process the child content + nsFrameList childList; + ProcessChildren(aState, aContent, aComputedStyle, blockFrame, true, childList, + true); + + if (!MayNeedToCreateColumnSpanSiblings(blockFrame, childList)) { + // No need to create column-span siblings. + blockFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + return; + } + + // Extract any initial non-column-span kids, and put them in block frame's + // child list. + nsFrameList initialNonColumnSpanKids = + childList.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + blockFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(initialNonColumnSpanKids)); + + if (childList.IsEmpty()) { + // No more kids to process (there weren't any column-span kids). + return; + } + + nsFrameList columnSpanSiblings = CreateColumnSpanSiblings( + aState, blockFrame, childList, + // If we're constructing a column container, pass nullptr as + // aPositionedFrame to forbid reparenting absolute/fixed positioned frames + // to column contents or column-span wrappers. + needsColumn ? nullptr : aPositionedFrameForAbsPosContainer); + + if (needsColumn) { + // We're constructing a column container; need to finish building it. + FinishBuildingColumns(aState, *aNewFrame, blockFrame, columnSpanSiblings); + } else { + // We're constructing a normal block which has column-span children in a + // column hierarchy such as "x" in the following example. + // + // <div style="column-count: 2"> + // <div id="x"> + // <div>normal child</div> + // <div style="column-span">spanner</div> + // </div> + // </div> + aFrameList.AppendFrames(nullptr, std::move(columnSpanSiblings)); + } + + MOZ_ASSERT(columnSpanSiblings.IsEmpty(), + "The column-span siblings should be moved to the proper place!"); +} + +nsBlockFrame* nsCSSFrameConstructor::BeginBuildingColumns( + nsFrameConstructorState& aState, nsIContent* aContent, + nsContainerFrame* aParentFrame, nsContainerFrame* aColumnContent, + ComputedStyle* aComputedStyle) { + MOZ_ASSERT(aColumnContent->IsBlockFrame(), + "aColumnContent should be a block frame."); + MOZ_ASSERT(aComputedStyle->StyleColumn()->IsColumnContainerStyle(), + "No need to build a column hierarchy!"); + + // The initial column hierarchy looks like this: + // + // ColumnSetWrapper (original style) + // ColumnSet (-moz-column-set) + // Block (-moz-column-content) + // + nsBlockFrame* columnSetWrapper = NS_NewColumnSetWrapperFrame( + mPresShell, aComputedStyle, nsFrameState(NS_FRAME_OWNS_ANON_BOXES)); + InitAndRestoreFrame(aState, aContent, aParentFrame, columnSetWrapper); + if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) && + !ShouldSuppressColumnSpanDescendants(aParentFrame)) { + columnSetWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + } + + AutoFrameConstructionPageName pageNameTracker(aState, columnSetWrapper); + RefPtr<ComputedStyle> columnSetStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::columnSet, aComputedStyle); + nsContainerFrame* columnSet = NS_NewColumnSetFrame( + mPresShell, columnSetStyle, nsFrameState(NS_FRAME_OWNS_ANON_BOXES)); + InitAndRestoreFrame(aState, aContent, columnSetWrapper, columnSet); + columnSet->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + + RefPtr<ComputedStyle> blockStyle = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::columnContent, columnSetStyle); + aColumnContent->SetComputedStyleWithoutNotification(blockStyle); + InitAndRestoreFrame(aState, aContent, columnSet, aColumnContent); + aColumnContent->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR | + NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS); + + // Set up the parent-child chain. + SetInitialSingleChild(columnSetWrapper, columnSet); + SetInitialSingleChild(columnSet, aColumnContent); + + return columnSetWrapper; +} + +void nsCSSFrameConstructor::FinishBuildingColumns( + nsFrameConstructorState& aState, nsContainerFrame* aColumnSetWrapper, + nsContainerFrame* aColumnContent, nsFrameList& aColumnContentSiblings) { + nsContainerFrame* prevColumnSet = aColumnContent->GetParent(); + + MOZ_ASSERT(prevColumnSet->IsColumnSetFrame() && + prevColumnSet->GetParent() == aColumnSetWrapper, + "Should have established column hierarchy!"); + + // Tag the first ColumnSet to have column-span siblings so that the bit can + // propagate to all the continuations. We don't want the last ColumnSet to + // have this bit, so we will unset the bit for it at the end of this function. + prevColumnSet->SetHasColumnSpanSiblings(true); + + nsFrameList finalList; + while (aColumnContentSiblings.NotEmpty()) { + nsIFrame* f = aColumnContentSiblings.RemoveFirstChild(); + if (f->IsColumnSpan()) { + // Do nothing for column-span wrappers. Just move it to the final + // items. + finalList.AppendFrame(aColumnSetWrapper, f); + } else { + auto* continuingColumnSet = static_cast<nsContainerFrame*>( + CreateContinuingFrame(prevColumnSet, aColumnSetWrapper, false)); + MOZ_ASSERT(continuingColumnSet->HasColumnSpanSiblings(), + "The bit should propagate to the next continuation!"); + + f->SetParent(continuingColumnSet); + SetInitialSingleChild(continuingColumnSet, f); + finalList.AppendFrame(aColumnSetWrapper, continuingColumnSet); + prevColumnSet = continuingColumnSet; + } + } + + // Unset the bit because the last ColumnSet has no column-span siblings. + prevColumnSet->SetHasColumnSpanSiblings(false); + + aColumnSetWrapper->AppendFrames(FrameChildListID::Principal, + std::move(finalList)); +} + +bool nsCSSFrameConstructor::MayNeedToCreateColumnSpanSiblings( + nsContainerFrame* aBlockFrame, const nsFrameList& aChildList) { + if (!aBlockFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + // The block frame isn't in a multi-column block formatting context. + return false; + } + + if (ShouldSuppressColumnSpanDescendants(aBlockFrame)) { + // No need to create column-span siblings for a frame that suppresses them. + return false; + } + + if (aChildList.IsEmpty()) { + // No child needs to be processed. + return false; + } + + // Need to actually look into the child list. + return true; +} + +nsFrameList nsCSSFrameConstructor::CreateColumnSpanSiblings( + nsFrameConstructorState& aState, nsContainerFrame* aInitialBlock, + nsFrameList& aChildList, nsIFrame* aPositionedFrame) { + MOZ_ASSERT(aInitialBlock->IsBlockFrameOrSubclass()); + MOZ_ASSERT(!aPositionedFrame || aPositionedFrame->IsAbsPosContainingBlock()); + + nsIContent* const content = aInitialBlock->GetContent(); + nsContainerFrame* const parentFrame = aInitialBlock->GetParent(); + const bool isInitialBlockFloatCB = aInitialBlock->IsFloatContainingBlock(); + + nsFrameList siblings; + nsContainerFrame* lastNonColumnSpanWrapper = aInitialBlock; + + // Tag the first non-column-span wrapper to have column-span siblings so that + // the bit can propagate to all the continuations. We don't want the last + // wrapper to have this bit, so we will unset the bit for it at the end of + // this function. + lastNonColumnSpanWrapper->SetHasColumnSpanSiblings(true); + do { + MOZ_ASSERT(aChildList.NotEmpty(), "Why call this if child list is empty?"); + MOZ_ASSERT(aChildList.FirstChild()->IsColumnSpan(), + "Must have the child starting with column-span!"); + + // Grab the consecutive column-span kids, and reparent them into a + // block frame. + RefPtr<ComputedStyle> columnSpanWrapperStyle = + mPresShell->StyleSet()->ResolveNonInheritingAnonymousBoxStyle( + PseudoStyleType::columnSpanWrapper); + nsBlockFrame* columnSpanWrapper = + NS_NewBlockFrame(mPresShell, columnSpanWrapperStyle); + InitAndRestoreFrame(aState, content, parentFrame, columnSpanWrapper, false); + columnSpanWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR | + NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + + nsFrameList columnSpanKids = + aChildList.Split([](nsIFrame* f) { return !f->IsColumnSpan(); }); + columnSpanKids.ApplySetParent(columnSpanWrapper); + columnSpanWrapper->SetInitialChildList(FrameChildListID::Principal, + std::move(columnSpanKids)); + if (aPositionedFrame) { + aState.ReparentAbsoluteItems(columnSpanWrapper); + } + + siblings.AppendFrame(nullptr, columnSpanWrapper); + + // Grab the consecutive non-column-span kids, and reparent them into a new + // continuation of the last non-column-span wrapper frame. + auto* nonColumnSpanWrapper = static_cast<nsContainerFrame*>( + CreateContinuingFrame(lastNonColumnSpanWrapper, parentFrame, false)); + nonColumnSpanWrapper->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR | + NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + MOZ_ASSERT(nonColumnSpanWrapper->HasColumnSpanSiblings(), + "The bit should propagate to the next continuation!"); + + if (aChildList.NotEmpty()) { + nsFrameList nonColumnSpanKids = + aChildList.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + + nonColumnSpanKids.ApplySetParent(nonColumnSpanWrapper); + nonColumnSpanWrapper->SetInitialChildList(FrameChildListID::Principal, + std::move(nonColumnSpanKids)); + if (aPositionedFrame) { + aState.ReparentAbsoluteItems(nonColumnSpanWrapper); + } + if (isInitialBlockFloatCB) { + aState.ReparentFloats(nonColumnSpanWrapper); + } + } + + siblings.AppendFrame(nullptr, nonColumnSpanWrapper); + + lastNonColumnSpanWrapper = nonColumnSpanWrapper; + } while (aChildList.NotEmpty()); + + // Unset the bit because the last non-column-span wrapper has no column-span + // siblings. + lastNonColumnSpanWrapper->SetHasColumnSpanSiblings(false); + + return siblings; +} + +bool nsCSSFrameConstructor::MaybeRecreateForColumnSpan( + nsFrameConstructorState& aState, nsContainerFrame* aParentFrame, + nsFrameList& aFrameList, nsIFrame* aPrevSibling) { + if (!aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + return false; + } + + if (aFrameList.IsEmpty()) { + return false; + } + + MOZ_ASSERT(!IsFramePartOfIBSplit(aParentFrame), + "We should have wiped aParentFrame in WipeContainingBlock if it's " + "part of IB split!"); + + nsIFrame* nextSibling = ::GetInsertNextSibling(aParentFrame, aPrevSibling); + if (!nextSibling && IsLastContinuationForColumnContent(aParentFrame)) { + // We are appending a list of frames to the last continuation of a + // ::-moz-column-content. This is the case where we can fix the frame tree + // instead of reframing the containing block. Return false and let + // AppendFramesToParent() deal with this. + return false; + } + + auto HasColumnSpan = [](const nsFrameList& aList) { + for (nsIFrame* f : aList) { + if (f->IsColumnSpan()) { + return true; + } + } + return false; + }; + + if (HasColumnSpan(aFrameList)) { + // If any frame in the frame list has "column-span:all" style, i.e. a + // -moz-column-span-wrapper frame, we need to reframe the multi-column + // containing block. + // + // We can only be here if none of the new inserted nsIContent* nodes (via + // ContentAppended or ContentRangeInserted) have column-span:all style, yet + // some of them have column-span:all descendants. Sadly, there's no way to + // detect this by checking FrameConstructionItems in WipeContainingBlock(). + // Otherwise, we would have already wiped the multi-column containing block. + PROFILER_MARKER("Reframe multi-column after constructing frame list", + LAYOUT, {}, Tracing, "Layout"); + + // aFrameList can contain placeholder frames. In order to destroy their + // associated out-of-flow frames properly, we need to manually flush all the + // out-of-flow frames in aState to their container frames. + aState.ProcessFrameInsertionsForAllLists(); + aFrameList.DestroyFrames(); + RecreateFramesForContent( + GetMultiColumnContainingBlockFor(aParentFrame)->GetContent(), + InsertionKind::Async); + return true; + } + + return false; +} + +nsIFrame* nsCSSFrameConstructor::ConstructInline( + nsFrameConstructorState& aState, FrameConstructionItem& aItem, + nsContainerFrame* aParentFrame, const nsStyleDisplay* aDisplay, + nsFrameList& aFrameList) { + // If an inline frame has non-inline kids, then we chop up the child list + // into runs of blocks and runs of inlines, create anonymous block frames to + // contain the runs of blocks, inline frames with our style for the runs of + // inlines, and put all these frames, in order, into aFrameList. + // + // When there are column-span blocks in a run of blocks, instead of creating + // an anonymous block to wrap them, we create multiple anonymous blocks, + // wrapping runs of non-column-spans and runs of column-spans. + // + // We return the the first one. The whole setup is called an {ib} + // split; in what follows "frames in the split" refers to the anonymous blocks + // and inlines that contain our children. + // + // {ib} splits maintain the following invariants: + // 1) All frames in the split have the NS_FRAME_PART_OF_IBSPLIT bit + // set. + // + // 2) Each frame in the split has the nsIFrame::IBSplitSibling + // property pointing to the next frame in the split, except for the last + // one, which does not have it set. + // + // 3) Each frame in the split has the nsIFrame::IBSplitPrevSibling + // property pointing to the previous frame in the split, except for the + // first one, which does not have it set. + // + // 4) The first and last frame in the split are always inlines. + // + // 5) The frames wrapping runs of non-column-spans are linked together as + // continuations. The frames wrapping runs of column-spans are *not* + // linked with each other nor with other non-column-span wrappers. + // + // 6) The first and last frame in the chains of blocks are always wrapping + // non-column-spans. Both of them are created even if they're empty. + // + // An invariant that is NOT maintained is that the wrappers are actually + // linked via GetNextSibling linkage. A simple example is an inline + // containing an inline that contains a block. The three parts of the inner + // inline end up with three different parents. + // + // For example, this HTML: + // <span> + // <div>a</div> + // <span> + // b + // <div>c</div> + // </span> + // d + // <div>e</div> + // f + // </span> + // Gives the following frame tree: + // + // Inline (outer span) + // Block (anonymous, outer span) + // Block (div) + // Text("a") + // Inline (outer span) + // Inline (inner span) + // Text("b") + // Block (anonymous, outer span) + // Block (anonymous, inner span) + // Block (div) + // Text("c") + // Inline (outer span) + // Inline (inner span) + // Text("d") + // Block (anonymous, outer span) + // Block (div) + // Text("e") + // Inline (outer span) + // Text("f") + + nsIContent* const content = aItem.mContent; + ComputedStyle* const computedStyle = aItem.mComputedStyle; + + nsInlineFrame* newFrame = NS_NewInlineFrame(mPresShell, computedStyle); + + // Initialize the frame + InitAndRestoreFrame(aState, content, aParentFrame, newFrame); + + // definition cannot be inside next block because the object's destructor is + // significant. this is part of the fix for bug 42372 + nsFrameConstructorSaveState absoluteSaveState; + + bool isAbsPosCB = newFrame->IsAbsPosContainingBlock(); + newFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (isAbsPosCB) { + // Relatively positioned frames becomes a container for child + // frames that are positioned + aState.PushAbsoluteContainingBlock(newFrame, newFrame, absoluteSaveState); + } + + if (aParentFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR) && + !ShouldSuppressColumnSpanDescendants(aParentFrame)) { + newFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + } + + // Process the child content + nsFrameList childList; + ConstructFramesFromItemList(aState, aItem.mChildItems, newFrame, + /* aParentIsWrapperAnonBox = */ false, childList); + + nsIFrame* firstBlock = nullptr; + if (!aItem.mIsAllInline) { + for (nsIFrame* f : childList) { + if (f->IsBlockOutside()) { + firstBlock = f; + break; + } + } + } + + if (aItem.mIsAllInline || !firstBlock) { + // This part is easy. We either already know we have no non-inline kids, + // or haven't found any when constructing actual frames (the latter can + // happen only if out-of-flows that we thought had no containing block + // acquired one when ancestor inline frames and {ib} splits got + // constructed). Just put all the kids into the single inline frame and + // bail. + newFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(childList)); + aState.AddChild(newFrame, aFrameList, content, aParentFrame); + return newFrame; + } + + // This inline frame contains several types of children. Therefore this frame + // has to be chopped into several pieces, as described above. + + // Grab the first inline's kids + nsFrameList firstInlineKids = childList.TakeFramesBefore(firstBlock); + newFrame->SetInitialChildList(FrameChildListID::Principal, + std::move(firstInlineKids)); + + aFrameList.AppendFrame(nullptr, newFrame); + + newFrame->AddStateBits(NS_FRAME_OWNS_ANON_BOXES); + CreateIBSiblings(aState, newFrame, isAbsPosCB, childList, aFrameList); + + return newFrame; +} + +void nsCSSFrameConstructor::CreateIBSiblings(nsFrameConstructorState& aState, + nsContainerFrame* aInitialInline, + bool aIsAbsPosCB, + nsFrameList& aChildList, + nsFrameList& aSiblings) { + MOZ_ASSERT(aIsAbsPosCB == aInitialInline->IsAbsPosContainingBlock()); + + nsIContent* content = aInitialInline->GetContent(); + ComputedStyle* computedStyle = aInitialInline->Style(); + nsContainerFrame* parentFrame = aInitialInline->GetParent(); + + // Resolve the right style for our anonymous blocks. + // + // The distinction in styles is needed because of CSS 2.1, section + // 9.2.1.1, which says: + // + // When such an inline box is affected by relative positioning, any + // resulting translation also affects the block-level box contained + // in the inline box. + RefPtr<ComputedStyle> blockSC = + mPresShell->StyleSet()->ResolveInheritingAnonymousBoxStyle( + PseudoStyleType::mozBlockInsideInlineWrapper, computedStyle); + + nsContainerFrame* lastNewInline = + static_cast<nsContainerFrame*>(aInitialInline->FirstContinuation()); + do { + // On entry to this loop aChildList is not empty and the first frame in it + // is block-level. + MOZ_ASSERT(aChildList.NotEmpty(), "Should have child items"); + MOZ_ASSERT(aChildList.FirstChild()->IsBlockOutside(), + "Must have list starting with block"); + + // The initial run of blocks belongs to an anonymous block that we create + // right now. The anonymous block will be the parent of these block + // children of the inline. + nsBlockFrame* blockFrame = NS_NewBlockFrame(mPresShell, blockSC); + InitAndRestoreFrame(aState, content, parentFrame, blockFrame, false); + if (aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + blockFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + } + + // Find the first non-block child which defines the end of our block kids + // and the start of our next inline's kids + nsFrameList blockKids = + aChildList.Split([](nsIFrame* f) { return !f->IsBlockOutside(); }); + + if (!aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + MoveChildrenTo(aInitialInline, blockFrame, blockKids); + + SetFrameIsIBSplit(lastNewInline, blockFrame); + aSiblings.AppendFrame(nullptr, blockFrame); + } else { + // Extract any initial non-column-span frames, and put them in + // blockFrame's child list. + nsFrameList initialNonColumnSpanKids = + blockKids.Split([](nsIFrame* f) { return f->IsColumnSpan(); }); + MoveChildrenTo(aInitialInline, blockFrame, initialNonColumnSpanKids); + + SetFrameIsIBSplit(lastNewInline, blockFrame); + aSiblings.AppendFrame(nullptr, blockFrame); + + if (blockKids.NotEmpty()) { + // Although SetFrameIsIBSplit() will add NS_FRAME_PART_OF_IBSPLIT for + // blockFrame later, we manually add the bit earlier here to make all + // the continuations of blockFrame created in + // CreateColumnSpanSiblings(), i.e. non-column-span wrappers, have the + // bit via nsIFrame::Init(). + blockFrame->AddStateBits(NS_FRAME_PART_OF_IBSPLIT); + + nsFrameList columnSpanSiblings = + CreateColumnSpanSiblings(aState, blockFrame, blockKids, + aIsAbsPosCB ? aInitialInline : nullptr); + aSiblings.AppendFrames(nullptr, std::move(columnSpanSiblings)); + } + } + + // Now grab the initial inlines in aChildList and put them into an inline + // frame. + nsInlineFrame* inlineFrame = NS_NewInlineFrame(mPresShell, computedStyle); + InitAndRestoreFrame(aState, content, parentFrame, inlineFrame, false); + inlineFrame->AddStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN); + if (aInitialInline->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + inlineFrame->AddStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR); + } + + if (aIsAbsPosCB) { + inlineFrame->MarkAsAbsoluteContainingBlock(); + } + + if (aChildList.NotEmpty()) { + nsFrameList inlineKids = + aChildList.Split([](nsIFrame* f) { return f->IsBlockOutside(); }); + MoveChildrenTo(aInitialInline, inlineFrame, inlineKids); + } + + SetFrameIsIBSplit(blockFrame, inlineFrame); + aSiblings.AppendFrame(nullptr, inlineFrame); + lastNewInline = inlineFrame; + } while (aChildList.NotEmpty()); + + SetFrameIsIBSplit(lastNewInline, nullptr); +} + +void nsCSSFrameConstructor::BuildInlineChildItems( + nsFrameConstructorState& aState, FrameConstructionItem& aParentItem, + bool aItemIsWithinSVGText, bool aItemAllowsTextPathChild) { + ComputedStyle* const parentComputedStyle = aParentItem.mComputedStyle; + nsIContent* const parentContent = aParentItem.mContent; + + if (!aItemIsWithinSVGText) { + if (parentComputedStyle->StyleDisplay()->IsListItem()) { + CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(), + *parentComputedStyle, PseudoStyleType::marker, + aParentItem.mChildItems); + } + // Probe for generated content before + CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(), + *parentComputedStyle, PseudoStyleType::before, + aParentItem.mChildItems); + } + + ItemFlags flags; + if (aItemIsWithinSVGText) { + flags += ItemFlag::IsWithinSVGText; + } + if (aItemAllowsTextPathChild && + aParentItem.mContent->IsSVGElement(nsGkAtoms::a)) { + flags += ItemFlag::AllowTextPathChild; + } + + FlattenedChildIterator iter(parentContent); + for (nsIContent* content = iter.GetNextChild(); content; + content = iter.GetNextChild()) { + AddFrameConstructionItems(aState, content, iter.ShadowDOMInvolved(), + *parentComputedStyle, InsertionPoint(), + aParentItem.mChildItems, flags); + } + + if (!aItemIsWithinSVGText) { + // Probe for generated content after + CreateGeneratedContentItem(aState, nullptr, *parentContent->AsElement(), + *parentComputedStyle, PseudoStyleType::after, + aParentItem.mChildItems); + } + + aParentItem.mIsAllInline = aParentItem.mChildItems.AreAllItemsInline(); +} + +// return whether it's ok to append (in the AppendFrames sense) to +// aParentFrame if our nextSibling is aNextSibling. aParentFrame must +// be an ib-split inline. +static bool IsSafeToAppendToIBSplitInline(nsIFrame* aParentFrame, + nsIFrame* aNextSibling) { + MOZ_ASSERT(IsInlineFrame(aParentFrame), "Must have an inline parent here"); + + do { + NS_ASSERTION(IsFramePartOfIBSplit(aParentFrame), + "How is this not part of an ib-split?"); + if (aNextSibling || aParentFrame->GetNextContinuation() || + GetIBSplitSibling(aParentFrame)) { + return false; + } + + aNextSibling = aParentFrame->GetNextSibling(); + aParentFrame = aParentFrame->GetParent(); + } while (IsInlineFrame(aParentFrame)); + + return true; +} + +bool nsCSSFrameConstructor::WipeInsertionParent(nsContainerFrame* aFrame) { +#define TRACE(reason) \ + PROFILER_MARKER("WipeInsertionParent: " reason, LAYOUT, {}, Tracing, \ + "Layout"); + + const LayoutFrameType frameType = aFrame->Type(); + + // FIXME(emilio): This looks terribly inefficient if you insert elements deep + // in a MathML subtree. + if (aFrame->IsFrameOfType(nsIFrame::eMathML)) { + TRACE("MathML"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + + // A ruby-related frame that's getting new children. + // The situation for ruby is complex, especially when interacting with + // spaces. It contains these two special cases apart from tables: + // 1) There are effectively three types of white spaces in ruby frames + // we handle differently: leading/tailing/inter-level space, + // inter-base/inter-annotation space, and inter-segment space. + // These three types of spaces can be converted to each other when + // their sibling changes. + // 2) The first effective child of a ruby frame must always be a ruby + // base container. It should be created or destroyed accordingly. + if (IsRubyPseudo(aFrame) || frameType == LayoutFrameType::Ruby || + RubyUtils::IsRubyContainerBox(frameType)) { + // We want to optimize it better, and avoid reframing as much as + // possible. But given the cases above, and the fact that a ruby + // usually won't be very large, it should be fine to reframe it. + TRACE("Ruby"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + + // Reframe the multi-column container whenever elements insert/append + // into it because we need to reconstruct column-span split. + if (aFrame->IsColumnSetWrapperFrame()) { + TRACE("Multi-column"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + + return false; + +#undef TRACE +} + +bool nsCSSFrameConstructor::WipeContainingBlock( + nsFrameConstructorState& aState, nsIFrame* aContainingBlock, + nsIFrame* aFrame, FrameConstructionItemList& aItems, bool aIsAppend, + nsIFrame* aPrevSibling) { +#define TRACE(reason) \ + PROFILER_MARKER("WipeContainingBlock: " reason, LAYOUT, {}, Tracing, \ + "Layout"); + + if (aItems.IsEmpty()) { + return false; + } + + // Before we go and append the frames, we must check for several + // special situations. + + if (aFrame->GetContent() == mDocument->GetRootElement()) { + // Situation #1 is when we insert content that becomes the canonical body + // element, and its used WritingMode is different from the root element's + // used WritingMode. + // We need to reframe the root element so that the root element's frames has + // the correct writing-mode propagated from body element. (See + // nsCSSFrameConstructor::ConstructDocElementFrame.) + // + // Bug 1594297: When inserting a new <body>, we may need to reframe the old + // <body> which has a "overflow" value other than simple "visible". But it's + // tricky, see bug 1593752. + nsIContent* bodyElement = mDocument->GetBodyElement(); + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + const WritingMode bodyWM(iter.item().mComputedStyle); + if (iter.item().mContent == bodyElement && + bodyWM != aFrame->GetWritingMode()) { + TRACE("Root"); + RecreateFramesForContent(mDocument->GetRootElement(), + InsertionKind::Async); + return true; + } + } + } + + nsIFrame* nextSibling = ::GetInsertNextSibling(aFrame, aPrevSibling); + + // Situation #2 is a flex / grid / XUL box container frame into which we're + // inserting new inline non-replaced children, adjacent to an existing + // anonymous flex or grid item. + if (aFrame->IsFlexOrGridContainer() || aFrame->IsXULBoxFrame()) { + FCItemIterator iter(aItems); + + // Check if we're adding to-be-wrapped content right *after* an existing + // anonymous flex or grid item (which would need to absorb this content). + const bool isLegacyWebKitBox = IsFlexContainerForLegacyWebKitBox(aFrame); + if (aPrevSibling && IsAnonymousItem(aPrevSibling) && + iter.item().NeedsAnonFlexOrGridItem(aState, isLegacyWebKitBox)) { + TRACE("Inserting inline after anon flex or grid item"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + + // Check if we're adding to-be-wrapped content right *before* an existing + // anonymous flex or grid item (which would need to absorb this content). + if (nextSibling && IsAnonymousItem(nextSibling)) { + // Jump to the last entry in the list + iter.SetToEnd(); + iter.Prev(); + if (iter.item().NeedsAnonFlexOrGridItem(aState, isLegacyWebKitBox)) { + TRACE("Inserting inline before anon flex or grid item"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + } + } + + // Situation #3 is an anonymous flex or grid item that's getting new children + // who don't want to be wrapped. + if (IsAnonymousItem(aFrame)) { + AssertAnonymousFlexOrGridItemParent(aFrame, aFrame->GetParent()); + + // We need to push a null float containing block to be sure that + // "NeedsAnonFlexOrGridItem" will know we're not honoring floats for this + // inserted content. (In particular, this is necessary in order for + // its "GetGeometricParent" call to return the correct result.) + // We're not honoring floats on this content because it has the + // _flex/grid container_ as its parent in the content tree. + nsFrameConstructorSaveState floatSaveState; + aState.PushFloatContainingBlock(nullptr, floatSaveState); + + FCItemIterator iter(aItems); + // Skip over things that _do_ need an anonymous flex item, because + // they're perfectly happy to go here -- they won't cause a reframe. + nsIFrame* containerFrame = aFrame->GetParent(); + const bool isLegacyWebKitBox = + IsFlexContainerForLegacyWebKitBox(containerFrame); + if (!iter.SkipItemsThatNeedAnonFlexOrGridItem(aState, isLegacyWebKitBox)) { + // We hit something that _doesn't_ need an anonymous flex item! + // Rebuild the flex container to bust it out. + TRACE("Inserting non-inlines inside anon flex or grid item"); + RecreateFramesForContent(containerFrame->GetContent(), + InsertionKind::Async); + return true; + } + + // If we get here, then everything in |aItems| needs to be wrapped in + // an anonymous flex or grid item. That's where it's already going - good! + } + + // Situation #4 is a case when table pseudo-frames don't work out right + ParentType parentType = GetParentType(aFrame); + // If all the kids want a parent of the type that aFrame is, then we're all + // set to go. Indeed, there won't be any table pseudo-frames created between + // aFrame and the kids, so those won't need to be merged with any table + // pseudo-frames that might already be kids of aFrame. If aFrame itself is a + // table pseudo-frame, then all the kids in this list would have wanted a + // frame of that type wrapping them anyway, so putting them inside it is ok. + if (!aItems.AllWantParentType(parentType)) { + // Don't give up yet. If parentType is not eTypeBlock and the parent is + // not a generated content frame, then try filtering whitespace out of the + // list. + if (parentType != eTypeBlock && !aFrame->IsGeneratedContentFrame()) { + // For leading whitespace followed by a kid that wants our parent type, + // there are four cases: + // 1) We have a previous sibling which is not a table pseudo. That means + // that previous sibling wanted a (non-block) parent of the type we're + // looking at. Then the whitespace comes between two table-internal + // elements, so should be collapsed out. + // 2) We have a previous sibling which is a table pseudo. It might have + // kids who want this whitespace, so we need to reframe. + // 3) We have no previous sibling and our parent frame is not a table + // pseudo. That means that we'll be at the beginning of our actual + // non-block-type parent, and the whitespace is OK to collapse out. + // If something is ever inserted before us, it'll find our own parent + // as its parent and if it's something that would care about the + // whitespace it'll want a block parent, so it'll trigger a reframe at + // that point. + // 4) We have no previous sibling and our parent frame is a table pseudo. + // Need to reframe. + // All that is predicated on finding the correct previous sibling. We + // might have to walk backwards along continuations from aFrame to do so. + // + // It's always OK to drop whitespace between any two items that want a + // parent of type parentType. + // + // For trailing whitespace preceded by a kid that wants our parent type, + // there are four cases: + // 1) We have a next sibling which is not a table pseudo. That means + // that next sibling wanted a (non-block) parent of the type we're + // looking at. Then the whitespace comes between two table-internal + // elements, so should be collapsed out. + // 2) We have a next sibling which is a table pseudo. It might have + // kids who want this whitespace, so we need to reframe. + // 3) We have no next sibling and our parent frame is not a table + // pseudo. That means that we'll be at the end of our actual + // non-block-type parent, and the whitespace is OK to collapse out. + // If something is ever inserted after us, it'll find our own parent + // as its parent and if it's something that would care about the + // whitespace it'll want a block parent, so it'll trigger a reframe at + // that point. + // 4) We have no next sibling and our parent frame is a table pseudo. + // Need to reframe. + // All that is predicated on finding the correct next sibling. We might + // have to walk forward along continuations from aFrame to do so. That + // said, in the case when nextSibling is null at this point and aIsAppend + // is true, we know we're in case 3. Furthermore, in that case we don't + // even have to worry about the table pseudo situation; we know our + // parent is not a table pseudo there. + FCItemIterator iter(aItems); + FCItemIterator start(iter); + do { + if (iter.SkipItemsWantingParentType(parentType)) { + break; + } + + // iter points to an item that wants a different parent. If it's not + // whitespace, we're done; no more point scanning the list. + if (!iter.item().IsWhitespace(aState)) { + break; + } + + if (iter == start) { + // Leading whitespace. How to handle this depends on our + // previous sibling and aFrame. See the long comment above. + nsIFrame* prevSibling = aPrevSibling; + if (!prevSibling) { + // Try to find one after all + nsIFrame* parentPrevCont = aFrame->GetPrevContinuation(); + while (parentPrevCont) { + prevSibling = parentPrevCont->PrincipalChildList().LastChild(); + if (prevSibling) { + break; + } + parentPrevCont = parentPrevCont->GetPrevContinuation(); + } + }; + if (prevSibling) { + if (IsTablePseudo(prevSibling)) { + // need to reframe + break; + } + } else if (IsTablePseudo(aFrame)) { + // need to reframe + break; + } + } + + FCItemIterator spaceEndIter(iter); + // Advance spaceEndIter past any whitespace + bool trailingSpaces = spaceEndIter.SkipWhitespace(aState); + + bool okToDrop; + if (trailingSpaces) { + // Trailing whitespace. How to handle this depeds on aIsAppend, our + // next sibling and aFrame. See the long comment above. + okToDrop = aIsAppend && !nextSibling; + if (!okToDrop) { + if (!nextSibling) { + // Try to find one after all + nsIFrame* parentNextCont = aFrame->GetNextContinuation(); + while (parentNextCont) { + nextSibling = parentNextCont->PrincipalChildList().FirstChild(); + if (nextSibling) { + break; + } + parentNextCont = parentNextCont->GetNextContinuation(); + } + } + + okToDrop = (nextSibling && !IsTablePseudo(nextSibling)) || + (!nextSibling && !IsTablePseudo(aFrame)); + } +#ifdef DEBUG + else { + NS_ASSERTION(!IsTablePseudo(aFrame), "How did that happen?"); + } +#endif + } else { + okToDrop = (spaceEndIter.item().DesiredParentType() == parentType); + } + + if (okToDrop) { + iter.DeleteItemsTo(this, spaceEndIter); + } else { + // We're done: we don't want to drop the whitespace, and it has the + // wrong parent type. + break; + } + + // Now loop, since |iter| points to item right after the whitespace we + // removed. + } while (!iter.IsDone()); + } + + // We might be able to figure out some sort of optimizations here, but they + // would have to depend on having a correct aPrevSibling and a correct next + // sibling. For example, we can probably avoid reframing if none of + // aFrame, aPrevSibling, and next sibling are table pseudo-frames. But it + // doesn't seem worth it to worry about that for now, especially since we + // in fact do not have a reliable aPrevSibling, nor any next sibling, in + // this method. + + // aItems might have changed, so recheck the parent type thing. In fact, + // it might be empty, so recheck that too. + if (aItems.IsEmpty()) { + return false; + } + + if (!aItems.AllWantParentType(parentType)) { + // Reframing aFrame->GetContent() is good enough, since the content of + // table pseudo-frames is the ancestor content. + TRACE("Pseudo-frames going wrong"); + RecreateFramesForContent(aFrame->GetContent(), InsertionKind::Async); + return true; + } + } + + // Situation #5 is a frame in multicol subtree that's getting new children. + if (aFrame->HasAnyStateBits(NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR)) { + bool anyColumnSpanItems = false; + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + if (iter.item().mComputedStyle->StyleColumn()->IsColumnSpanStyle()) { + anyColumnSpanItems = true; + break; + } + } + + bool needsReframe = + // 1. Insert / append any column-span children. + anyColumnSpanItems || + // 2. GetInsertionPrevSibling() modifies insertion parent. If the prev + // sibling is a column-span, aFrame ends up being the + // column-span-wrapper. + aFrame->Style()->GetPseudoType() == + PseudoStyleType::columnSpanWrapper || + // 3. Append into {ib} split container. There might be room for + // optimization, but let's reframe for correctness... + IsFramePartOfIBSplit(aFrame); + + if (needsReframe) { + TRACE("Multi-column"); + RecreateFramesForContent( + GetMultiColumnContainingBlockFor(aFrame)->GetContent(), + InsertionKind::Async); + return true; + } + + // If we get here, then we need further check for {ib} split to decide + // whether to reframe. For example, appending a block into an empty inline + // that is not part of an {ib} split, but should become an {ib} split. + } + + // A <fieldset> may need to pick up a new rendered legend from aItems. + // We currently can't handle this case without recreating frames for + // the fieldset. + // XXXmats we should be able to optimize this when the fieldset doesn't + // currently have a rendered legend. ContentRangeInserted needs to be fixed + // to use the inner frame as the content insertion frame in that case. + if (const auto* fieldset = GetFieldSetFrameFor(aFrame)) { + // Check if any item is eligible to be a rendered legend. + for (FCItemIterator iter(aItems); !iter.IsDone(); iter.Next()) { + const auto& item = iter.item(); + if (!item.mContent->IsHTMLElement(nsGkAtoms::legend)) { + continue; + } + const auto* display = item.mComputedStyle->StyleDisplay(); + if (display->IsFloatingStyle() || + display->IsAbsolutelyPositionedStyle()) { + continue; + } + TRACE("Fieldset with rendered legend"); + RecreateFramesForContent(fieldset->GetContent(), InsertionKind::Async); + return true; + } + } + + // Now we have several cases involving {ib} splits. Put them all in a + // do/while with breaks to take us to the "go and reconstruct" code. + do { + if (IsInlineFrame(aFrame)) { + if (aItems.AreAllItemsInline()) { + // We can just put the kids in. + return false; + } + + if (!IsFramePartOfIBSplit(aFrame)) { + // Need to go ahead and reconstruct. + break; + } + + // Now we're adding kids including some blocks to an inline part of an + // {ib} split. If we plan to call AppendFrames, and don't have a next + // sibling for the new frames, and our parent is the last continuation of + // the last part of the {ib} split, and the same is true of all our + // ancestor inlines (they have no following continuations and they're the + // last part of their {ib} splits and we'd be adding to the end for all + // of them), then AppendFrames will handle things for us. Bail out in + // that case. + if (aIsAppend && IsSafeToAppendToIBSplitInline(aFrame, nextSibling)) { + return false; + } + + // Need to reconstruct. + break; + } + + // Now we know we have a block parent. If it's not part of an + // ib-split, we're all set. + if (!IsFramePartOfIBSplit(aFrame)) { + return false; + } + + // We're adding some kids to a block part of an {ib} split. If all the + // kids are blocks, we don't need to reconstruct. + if (aItems.AreAllItemsBlock()) { + return false; + } + + // We might have some inline kids for this block. Just fall out of the + // loop and reconstruct. + } while (0); + + // If we don't have a containing block, start with aFrame and look for one. + if (!aContainingBlock) { + aContainingBlock = aFrame; + } + + // To find the right block to reframe, just walk up the tree until we find a + // frame that is: + // 1) Not part of an IB split + // 2) Not a pseudo-frame + // 3) Not an inline frame + // We're guaranteed to find one, since ComputedStyle::ApplyStyleFixups + // enforces that the root is display:none, display:table, or display:block. + // Note that walking up "too far" is OK in terms of correctness, even if it + // might be a little inefficient. This is why we walk out of all + // pseudo-frames -- telling which ones are or are not OK to walk out of is + // too hard (and I suspect that we do in fact need to walk out of all of + // them). + while (IsFramePartOfIBSplit(aContainingBlock) || + aContainingBlock->IsInlineOutside() || + aContainingBlock->Style()->IsPseudoOrAnonBox()) { + aContainingBlock = aContainingBlock->GetParent(); + NS_ASSERTION(aContainingBlock, + "Must have non-inline, non-ib-split, non-pseudo frame as " + "root (or child of root, for a table root)!"); + } + + // Tell parent of the containing block to reformulate the + // entire block. This is painful and definitely not optimal + // but it will *always* get the right answer. + + nsIContent* blockContent = aContainingBlock->GetContent(); + TRACE("IB splits"); + RecreateFramesForContent(blockContent, InsertionKind::Async); + return true; +#undef TRACE +} + +void nsCSSFrameConstructor::ReframeContainingBlock(nsIFrame* aFrame) { + // XXXbz how exactly would we get here while isReflowing anyway? Should this + // whole test be ifdef DEBUG? + if (mPresShell->IsReflowLocked()) { + // don't ReframeContainingBlock, this will result in a crash + // if we remove a tree that's in reflow - see bug 121368 for testcase + NS_ERROR( + "Atemptted to nsCSSFrameConstructor::ReframeContainingBlock during a " + "Reflow!!!"); + return; + } + + // Get the first "normal" ancestor of the target frame. + nsIFrame* containingBlock = GetIBContainingBlockFor(aFrame); + if (containingBlock) { + // From here we look for the containing block in case the target + // frame is already a block (which can happen when an inline frame + // wraps some of its content in an anonymous block; see + // ConstructInline) + + // NOTE: We used to get the FloatContainingBlock here, but it was often + // wrong. GetIBContainingBlock works much better and provides the correct + // container in all cases so GetFloatContainingBlock(aFrame) has been + // removed + + // And get the containingBlock's content + if (nsIContent* blockContent = containingBlock->GetContent()) { +#ifdef DEBUG + if (gNoisyContentUpdates) { + printf(" ==> blockContent=%p\n", blockContent); + } +#endif + RecreateFramesForContent(blockContent, InsertionKind::Async); + return; + } + } + + // If we get here, we're screwed! + RecreateFramesForContent(mPresShell->GetDocument()->GetRootElement(), + InsertionKind::Async); +} + +////////////////////////////////////////////////////////// +// nsCSSFrameConstructor::FrameConstructionItem methods // +////////////////////////////////////////////////////////// +bool nsCSSFrameConstructor::FrameConstructionItem::IsWhitespace( + nsFrameConstructorState& aState) const { + MOZ_ASSERT(aState.mCreatingExtraFrames || !mContent->GetPrimaryFrame(), + "How did that happen?"); + if (!mIsText) { + return false; + } + mContent->SetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE | + NS_REFRAME_IF_WHITESPACE); + return mContent->TextIsOnlyWhitespace(); +} + +////////////////////////////////////////////////////////////// +// nsCSSFrameConstructor::FrameConstructionItemList methods // +////////////////////////////////////////////////////////////// +void nsCSSFrameConstructor::FrameConstructionItemList::AdjustCountsForItem( + FrameConstructionItem* aItem, int32_t aDelta) { + MOZ_ASSERT(aDelta == 1 || aDelta == -1, "Unexpected delta"); + mItemCount += aDelta; + if (aItem->mIsAllInline) { + mInlineCount += aDelta; + } + if (aItem->mIsBlock) { + mBlockCount += aDelta; + } + mDesiredParentCounts[aItem->DesiredParentType()] += aDelta; +} + +//////////////////////////////////////////////////////////////////////// +// nsCSSFrameConstructor::FrameConstructionItemList::Iterator methods // +//////////////////////////////////////////////////////////////////////// +inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + SkipItemsWantingParentType(ParentType aParentType) { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + while (item().DesiredParentType() == aParentType) { + Next(); + if (IsDone()) { + return true; + } + } + return false; +} + +inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + SkipItemsNotWantingParentType(ParentType aParentType) { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + while (item().DesiredParentType() != aParentType) { + Next(); + if (IsDone()) { + return true; + } + } + return false; +} + +// Note: we implement -webkit-{inline-}box using nsFlexContainerFrame, but we +// use different rules for what gets wrapped in an anonymous flex item. +bool nsCSSFrameConstructor::FrameConstructionItem::NeedsAnonFlexOrGridItem( + const nsFrameConstructorState& aState, bool aIsLegacyWebKitBox) { + if (mFCData->mBits & FCDATA_IS_LINE_PARTICIPANT) { + // This will be an inline non-replaced box. + return true; + } + + if (aIsLegacyWebKitBox) { + if (mComputedStyle->StyleDisplay()->IsInlineOutsideStyle()) { + // In an emulated legacy box, all inline-level content gets wrapped in an + // anonymous flex item. + return true; + } + if (mIsPopup || + (!(mFCData->mBits & FCDATA_DISALLOW_OUT_OF_FLOW) && + aState.GetGeometricParent(*mComputedStyle->StyleDisplay(), nullptr))) { + // We're abspos or fixedpos (or a XUL popup), which means we'll spawn a + // placeholder which (because our container is an emulated legacy box) + // we'll need to wrap in an anonymous flex item. So, we just treat + // _this_ frame as if _it_ needs to be wrapped in an anonymous flex item, + // and then when we spawn the placeholder, it'll end up in the right + // spot. + return true; + } + } + + return false; +} + +inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + SkipItemsThatNeedAnonFlexOrGridItem(const nsFrameConstructorState& aState, + bool aIsLegacyWebKitBox) { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + while (item().NeedsAnonFlexOrGridItem(aState, aIsLegacyWebKitBox)) { + Next(); + if (IsDone()) { + return true; + } + } + return false; +} + +inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + SkipItemsThatDontNeedAnonFlexOrGridItem( + const nsFrameConstructorState& aState, bool aIsLegacyWebKitBox) { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + while (!(item().NeedsAnonFlexOrGridItem(aState, aIsLegacyWebKitBox))) { + Next(); + if (IsDone()) { + return true; + } + } + return false; +} + +inline bool nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + SkipItemsNotWantingRubyParent() { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + while (!IsRubyParentType(item().DesiredParentType())) { + Next(); + if (IsDone()) { + return true; + } + } + return false; +} + +inline bool +nsCSSFrameConstructor::FrameConstructionItemList::Iterator::SkipWhitespace( + nsFrameConstructorState& aState) { + MOZ_ASSERT(!IsDone(), "Shouldn't be done yet"); + MOZ_ASSERT(item().IsWhitespace(aState), "Not pointing to whitespace?"); + do { + Next(); + if (IsDone()) { + return true; + } + } while (item().IsWhitespace(aState)); + + return false; +} + +void nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + AppendItemToList(FrameConstructionItemList& aTargetList) { + NS_ASSERTION(&aTargetList != &mList, "Unexpected call"); + MOZ_ASSERT(!IsDone(), "should not be done"); + + FrameConstructionItem* item = mCurrent; + Next(); + item->remove(); + aTargetList.mItems.insertBack(item); + + mList.AdjustCountsForItem(item, -1); + aTargetList.AdjustCountsForItem(item, 1); +} + +void nsCSSFrameConstructor::FrameConstructionItemList::Iterator:: + AppendItemsToList(nsCSSFrameConstructor* aFCtor, const Iterator& aEnd, + FrameConstructionItemList& aTargetList) { + NS_ASSERTION(&aTargetList != &mList, "Unexpected call"); + MOZ_ASSERT(&mList == &aEnd.mList, "End iterator for some other list?"); + + // We can't just move our guts to the other list if it already has + // some information or if we're not moving our entire list. + if (!AtStart() || !aEnd.IsDone() || !aTargetList.IsEmpty()) { + do { + AppendItemToList(aTargetList); + } while (*this != aEnd); + return; + } + + // Move our entire list of items into the empty target list. + aTargetList.mItems = std::move(mList.mItems); + + // Copy over the various counters + aTargetList.mInlineCount = mList.mInlineCount; + aTargetList.mBlockCount = mList.mBlockCount; + aTargetList.mItemCount = mList.mItemCount; + memcpy(aTargetList.mDesiredParentCounts, mList.mDesiredParentCounts, + sizeof(aTargetList.mDesiredParentCounts)); + + // reset mList + mList.Reset(aFCtor); + + // Point ourselves to aEnd, as advertised + SetToEnd(); + MOZ_ASSERT(*this == aEnd, "How did that happen?"); +} + +void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::InsertItem( + FrameConstructionItem* aItem) { + if (IsDone()) { + mList.mItems.insertBack(aItem); + } else { + // Just insert the item before us. There's no magic here. + mCurrent->setPrevious(aItem); + } + mList.AdjustCountsForItem(aItem, 1); + + MOZ_ASSERT(aItem->getNext() == mCurrent, "How did that happen?"); +} + +void nsCSSFrameConstructor::FrameConstructionItemList::Iterator::DeleteItemsTo( + nsCSSFrameConstructor* aFCtor, const Iterator& aEnd) { + MOZ_ASSERT(&mList == &aEnd.mList, "End iterator for some other list?"); + MOZ_ASSERT(*this != aEnd, "Shouldn't be at aEnd yet"); + + do { + NS_ASSERTION(!IsDone(), "Ran off end of list?"); + FrameConstructionItem* item = mCurrent; + Next(); + item->remove(); + mList.AdjustCountsForItem(item, -1); + item->Delete(aFCtor); + } while (*this != aEnd); +} + +void nsCSSFrameConstructor::QuotesDirty() { + mQuotesDirty = true; + mPresShell->SetNeedLayoutFlush(); +} + +void nsCSSFrameConstructor::CountersDirty() { + mCountersDirty = true; + mPresShell->SetNeedLayoutFlush(); +} + +void* nsCSSFrameConstructor::AllocateFCItem() { + void* item; + if (mFirstFreeFCItem) { + item = mFirstFreeFCItem; + mFirstFreeFCItem = mFirstFreeFCItem->mNext; + } else { + item = mFCItemPool.Allocate(sizeof(FrameConstructionItem)); + } + ++mFCItemsInUse; + return item; +} + +void nsCSSFrameConstructor::FreeFCItem(FrameConstructionItem* aItem) { + MOZ_ASSERT(mFCItemsInUse != 0); + if (--mFCItemsInUse == 0) { + // The arena is now unused - clear it but retain one chunk. + mFirstFreeFCItem = nullptr; + mFCItemPool.Clear(); + } else { + // Prepend it to the list of free items. + FreeFCItemLink* item = reinterpret_cast<FreeFCItemLink*>(aItem); + item->mNext = mFirstFreeFCItem; + mFirstFreeFCItem = item; + } +} + +void nsCSSFrameConstructor::AddSizeOfIncludingThis( + nsWindowSizes& aSizes) const { + if (nsIFrame* rootFrame = GetRootFrame()) { + rootFrame->AddSizeOfExcludingThisForTree(aSizes); + if (RetainedDisplayListBuilder* builder = + rootFrame->GetProperty(RetainedDisplayListBuilder::Cached())) { + builder->AddSizeOfIncludingThis(aSizes); + } + } + + // This must be done after measuring from the frame tree, since frame + // manager will measure sizes of staled computed values and style + // structs, which only make sense after we know what are being used. + nsFrameManager::AddSizeOfIncludingThis(aSizes); + + // Measurement of the following members may be added later if DMD finds it + // is worthwhile: + // - mFCItemPool + // - mContainStyleScopeManager +} |