/* -*- 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/. */ /* rendering object for CSS display:inline objects */ #include "nsInlineFrame.h" #include "gfxContext.h" #include "mozilla/ComputedStyle.h" #include "mozilla/Likely.h" #include "mozilla/PresShell.h" #include "mozilla/RestyleManager.h" #include "mozilla/ServoStyleSet.h" #include "mozilla/SVGTextFrame.h" #include "mozilla/SVGUtils.h" #include "nsLineLayout.h" #include "nsBlockFrame.h" #include "nsLayoutUtils.h" #include "nsPlaceholderFrame.h" #include "nsGkAtoms.h" #include "nsPresContext.h" #include "nsPresContextInlines.h" #include "nsCSSAnonBoxes.h" #include "nsDisplayList.h" #include "nsStyleChangeList.h" #ifdef DEBUG # undef NOISY_PUSHING #endif using namespace mozilla; using namespace mozilla::layout; ////////////////////////////////////////////////////////////////////// // Basic nsInlineFrame methods nsInlineFrame* NS_NewInlineFrame(PresShell* aPresShell, ComputedStyle* aStyle) { return new (aPresShell) nsInlineFrame(aStyle, aPresShell->GetPresContext()); } NS_IMPL_FRAMEARENA_HELPERS(nsInlineFrame) NS_QUERYFRAME_HEAD(nsInlineFrame) NS_QUERYFRAME_ENTRY(nsInlineFrame) NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) #ifdef DEBUG_FRAME_DUMP nsresult nsInlineFrame::GetFrameName(nsAString& aResult) const { return MakeFrameName(u"Inline"_ns, aResult); } #endif void nsInlineFrame::InvalidateFrame(uint32_t aDisplayItemKey, bool aRebuildDisplayItems) { if (SVGUtils::IsInSVGTextSubtree(this)) { nsIFrame* svgTextFrame = nsLayoutUtils::GetClosestFrameOfType( GetParent(), LayoutFrameType::SVGText); svgTextFrame->InvalidateFrame(); return; } nsContainerFrame::InvalidateFrame(aDisplayItemKey, aRebuildDisplayItems); } void nsInlineFrame::InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey, bool aRebuildDisplayItems) { if (SVGUtils::IsInSVGTextSubtree(this)) { nsIFrame* svgTextFrame = nsLayoutUtils::GetClosestFrameOfType( GetParent(), LayoutFrameType::SVGText); svgTextFrame->InvalidateFrame(); return; } nsContainerFrame::InvalidateFrameWithRect(aRect, aDisplayItemKey, aRebuildDisplayItems); } static inline bool IsMarginZero(const LengthPercentageOrAuto& aLength) { return aLength.IsAuto() || nsLayoutUtils::IsMarginZero(aLength.AsLengthPercentage()); } /* virtual */ bool nsInlineFrame::IsSelfEmpty() { #if 0 // I used to think inline frames worked this way, but it seems they // don't. At least not in our codebase. if (GetPresContext()->CompatibilityMode() == eCompatibility_FullStandards) { return false; } #endif const nsStyleMargin* margin = StyleMargin(); const nsStyleBorder* border = StyleBorder(); const nsStylePadding* padding = StylePadding(); // Block-start and -end ignored, since they shouldn't affect things, but this // doesn't really match with nsLineLayout.cpp's setting of // ZeroEffectiveSpanBox, anymore, so what should this really be? WritingMode wm = GetWritingMode(); bool haveStart, haveEnd; auto HaveSide = [&](mozilla::Side aSide) -> bool { return border->GetComputedBorderWidth(aSide) != 0 || !nsLayoutUtils::IsPaddingZero(padding->mPadding.Get(aSide)) || !IsMarginZero(margin->mMargin.Get(aSide)); }; // Initially set up haveStart and haveEnd in terms of visual (LTR/TTB) // coordinates; we'll exchange them later if bidi-RTL is in effect to // get logical start and end flags. if (wm.IsVertical()) { haveStart = HaveSide(eSideTop); haveEnd = HaveSide(eSideBottom); } else { haveStart = HaveSide(eSideLeft); haveEnd = HaveSide(eSideRight); } if (haveStart || haveEnd) { // We skip this block and return false for box-decoration-break:clone since // in that case all the continuations will have the border/padding/margin. if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT) && StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice) { // When direction=rtl, we need to consider logical rather than visual // start and end, so swap the flags. if (wm.IsBidiRTL()) { std::swap(haveStart, haveEnd); } // For ib-split frames, ignore things we know we'll skip in GetSkipSides. // XXXbz should we be doing this for non-ib-split frames too, in a more // general way? // Get the first continuation eagerly, as a performance optimization, to // avoid having to get it twice.. nsIFrame* firstCont = FirstContinuation(); return (!haveStart || firstCont->FrameIsNonFirstInIBSplit()) && (!haveEnd || firstCont->FrameIsNonLastInIBSplit()); } return false; } return true; } bool nsInlineFrame::IsEmpty() { if (!IsSelfEmpty()) { return false; } for (nsIFrame* kid : mFrames) { if (!kid->IsEmpty()) return false; } return true; } nsIFrame::FrameSearchResult nsInlineFrame::PeekOffsetCharacter( bool aForward, int32_t* aOffset, PeekOffsetCharacterOptions aOptions) { // Override the implementation in nsFrame, to skip empty inline frames NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range"); int32_t startOffset = *aOffset; if (startOffset < 0) startOffset = 1; if (aForward == (startOffset == 0)) { // We're before the frame and moving forward, or after it and moving // backwards: skip to the other side, but keep going. *aOffset = 1 - startOffset; } return CONTINUE; } void nsInlineFrame::DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) { nsFrameList* overflowFrames = GetOverflowFrames(); if (overflowFrames) { // Fixup the parent pointers for any child frames on the OverflowList. // nsIFrame::DestroyFrom depends on that to find the sticky scroll // container (an ancestor). overflowFrames->ApplySetParent(this); } nsContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData); } void nsInlineFrame::StealFrame(nsIFrame* aChild) { if (MaybeStealOverflowContainerFrame(aChild)) { return; } nsInlineFrame* parent = this; do { if (parent->mFrames.StartRemoveFrame(aChild)) { return; } // We didn't find the child in our principal child list. // Maybe it's on the overflow list? nsFrameList* frameList = parent->GetOverflowFrames(); if (frameList && frameList->ContinueRemoveFrame(aChild)) { if (frameList->IsEmpty()) { parent->DestroyOverflowList(); } return; } // Due to our "lazy reparenting" optimization 'aChild' might not actually // be on any of our child lists, but instead in one of our next-in-flows. parent = static_cast(parent->GetNextInFlow()); } while (parent); MOZ_ASSERT_UNREACHABLE("nsInlineFrame::StealFrame: can't find aChild"); } void nsInlineFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) { BuildDisplayListForInline(aBuilder, aLists); // The sole purpose of this is to trigger display of the selection // window for Named Anchors, which don't have any children and // normally don't have any size, but in Editor we use CSS to display // an image to represent this "hidden" element. if (!mFrames.FirstChild()) { DisplaySelectionOverlay(aBuilder, aLists.Content()); } } ////////////////////////////////////////////////////////////////////// // Reflow methods /* virtual */ void nsInlineFrame::AddInlineMinISize(gfxContext* aRenderingContext, nsIFrame::InlineMinISizeData* aData) { DoInlineIntrinsicISize(aRenderingContext, aData, IntrinsicISizeType::MinISize); } /* virtual */ void nsInlineFrame::AddInlinePrefISize(gfxContext* aRenderingContext, nsIFrame::InlinePrefISizeData* aData) { DoInlineIntrinsicISize(aRenderingContext, aData, IntrinsicISizeType::PrefISize); aData->mLineIsEmpty = false; } /* virtual */ nsIFrame::SizeComputationResult nsInlineFrame::ComputeSize( gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize, nscoord aAvailableISize, const LogicalSize& aMargin, const LogicalSize& aBorderPadding, ComputeSizeFlags aFlags) { // Inlines and text don't compute size before reflow. return {LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE), AspectRatioUsage::None}; } nsRect nsInlineFrame::ComputeTightBounds(DrawTarget* aDrawTarget) const { // be conservative if (Style()->HasTextDecorationLines()) { return InkOverflowRect(); } return ComputeSimpleTightBounds(aDrawTarget); } static void ReparentChildListStyle(nsPresContext* aPresContext, const nsFrameList::Slice& aFrames, nsIFrame* aParentFrame) { RestyleManager* restyleManager = aPresContext->RestyleManager(); for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) { NS_ASSERTION(e.get()->GetParent() == aParentFrame, "Bogus parentage"); restyleManager->ReparentComputedStyleForFirstLine(e.get()); nsLayoutUtils::MarkDescendantsDirty(e.get()); } } void nsInlineFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aMetrics, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) { MarkInReflow(); DO_GLOBAL_REFLOW_COUNT("nsInlineFrame"); DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus); MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); if (nullptr == aReflowInput.mLineLayout) { NS_ERROR("must have non-null aReflowInput.mLineLayout"); return; } if (IsFrameTreeTooDeep(aReflowInput, aMetrics, aStatus)) { return; } bool lazilySetParentPointer = false; // Check for an overflow list with our prev-in-flow nsInlineFrame* prevInFlow = (nsInlineFrame*)GetPrevInFlow(); if (prevInFlow) { AutoFrameListPtr prevOverflowFrames(aPresContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // When pushing and pulling frames we need to check for whether any // views need to be reparented. nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow, this); // Check if we should do the lazilySetParentPointer optimization. // Only do it in simple cases where we're being reflowed for the // first time, nothing (e.g. bidi resolution) has already given // us children, and there's no next-in-flow, so all our frames // will be taken from prevOverflowFrames. if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW) && mFrames.IsEmpty() && !GetNextInFlow()) { // If our child list is empty, just put the new frames into it. // Note that we don't set the parent pointer for the new frames. Instead // wait to do this until we actually reflow the frame. If the overflow // list contains thousands of frames this is a big performance issue // (see bug #5588) mFrames.SetFrames(*prevOverflowFrames); lazilySetParentPointer = true; } else { // Insert the new frames at the beginning of the child list // and set their parent pointer const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); // If our prev in flow was under the first continuation of a first-line // frame then we need to reparent the ComputedStyles to remove the // the special first-line styling. In the lazilySetParentPointer case // we reparent the ComputedStyles when we set their parents in // nsInlineFrame::ReflowFrames and nsInlineFrame::ReflowInlineFrame. if (aReflowInput.mLineLayout->GetInFirstLine()) { ReparentChildListStyle(aPresContext, newFrames, this); } } } } // It's also possible that we have an overflow list for ourselves #ifdef DEBUG if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { // If it's our initial reflow, then we should not have an overflow list. // However, add an assertion in case we get reflowed more than once with // the initial reflow reason nsFrameList* overflowFrames = GetOverflowFrames(); NS_ASSERTION(!overflowFrames || overflowFrames->IsEmpty(), "overflow list is not empty for initial reflow"); } #endif if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { DrainSelfOverflowListInternal(aReflowInput.mLineLayout->GetInFirstLine()); } // Set our own reflow input (additional state above and beyond aReflowInput). InlineReflowInput irs; irs.mPrevFrame = nullptr; irs.mLineContainer = aReflowInput.mLineLayout->LineContainerFrame(); irs.mLineLayout = aReflowInput.mLineLayout; irs.mNextInFlow = (nsInlineFrame*)GetNextInFlow(); irs.mSetParentPointer = lazilySetParentPointer; if (mFrames.IsEmpty()) { // Try to pull over one frame before starting so that we know // whether we have an anonymous block or not. Unused << PullOneFrame(aPresContext, irs); } ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus); ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus); // Note: the line layout code will properly compute our // overflow-rect state for us. NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics); } nsresult nsInlineFrame::AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, int32_t aModType) { nsresult rv = nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); if (NS_FAILED(rv)) { return rv; } if (SVGUtils::IsInSVGTextSubtree(this)) { SVGTextFrame* f = static_cast( nsLayoutUtils::GetClosestFrameOfType(this, LayoutFrameType::SVGText)); f->HandleAttributeChangeInDescendant(mContent->AsElement(), aNameSpaceID, aAttribute); } return NS_OK; } bool nsInlineFrame::DrainSelfOverflowListInternal(bool aInFirstLine) { AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames()); if (!overflowFrames || overflowFrames->IsEmpty()) { return false; } // The frames on our own overflowlist may have been pushed by a // previous lazilySetParentPointer Reflow so we need to ensure the // correct parent pointer. This is sometimes skipped by Reflow. nsIFrame* firstChild = overflowFrames->FirstChild(); RestyleManager* restyleManager = PresContext()->RestyleManager(); for (nsIFrame* f = firstChild; f; f = f->GetNextSibling()) { f->SetParent(this); if (MOZ_UNLIKELY(aInFirstLine)) { restyleManager->ReparentComputedStyleForFirstLine(f); nsLayoutUtils::MarkDescendantsDirty(f); } } mFrames.AppendFrames(nullptr, *overflowFrames); return true; } /* virtual */ bool nsInlineFrame::DrainSelfOverflowList() { nsIFrame* lineContainer = nsLayoutUtils::FindNearestBlockAncestor(this); // Add the eInFirstLine flag if we have a ::first-line ancestor frame. // No need to look further than the nearest line container though. bool inFirstLine = false; for (nsIFrame* p = GetParent(); p != lineContainer; p = p->GetParent()) { if (p->IsLineFrame()) { inFirstLine = true; break; } } return DrainSelfOverflowListInternal(inFirstLine); } /* virtual */ bool nsInlineFrame::CanContinueTextRun() const { // We can continue a text run through an inline frame return true; } /* virtual */ void nsInlineFrame::PullOverflowsFromPrevInFlow() { nsInlineFrame* prevInFlow = static_cast(GetPrevInFlow()); if (prevInFlow) { nsPresContext* presContext = PresContext(); AutoFrameListPtr prevOverflowFrames(presContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Assume that our prev-in-flow has the same line container that we do. nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow, this); mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); } } } void nsInlineFrame::ReflowFrames(nsPresContext* aPresContext, const ReflowInput& aReflowInput, InlineReflowInput& irs, ReflowOutput& aMetrics, nsReflowStatus& aStatus) { MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); nsLineLayout* lineLayout = aReflowInput.mLineLayout; bool inFirstLine = aReflowInput.mLineLayout->GetInFirstLine(); RestyleManager* restyleManager = aPresContext->RestyleManager(); WritingMode frameWM = aReflowInput.GetWritingMode(); WritingMode lineWM = aReflowInput.mLineLayout->mRootSpan->mWritingMode; LogicalMargin framePadding = aReflowInput.ComputedLogicalBorderPadding(frameWM); nscoord startEdge = 0; const bool boxDecorationBreakClone = MOZ_UNLIKELY( StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone); // Don't offset by our start borderpadding if we have a prev continuation or // if we're in a part of an {ib} split other than the first one. For // box-decoration-break:clone we always offset our start since all // continuations have border/padding. if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) || boxDecorationBreakClone) { startEdge = framePadding.IStart(frameWM); } nscoord availableISize = aReflowInput.AvailableISize(); NS_ASSERTION(availableISize != NS_UNCONSTRAINEDSIZE, "should no longer use available widths"); // Subtract off inline axis border+padding from availableISize availableISize -= startEdge; availableISize -= framePadding.IEnd(frameWM); lineLayout->BeginSpan(this, &aReflowInput, startEdge, startEdge + availableISize, &mBaseline); // First reflow our principal children. nsIFrame* frame = mFrames.FirstChild(); bool done = false; while (frame) { // Check if we should lazily set the child frame's parent pointer. if (irs.mSetParentPointer) { nsIFrame* child = frame; do { child->SetParent(this); if (inFirstLine) { restyleManager->ReparentComputedStyleForFirstLine(child); nsLayoutUtils::MarkDescendantsDirty(child); } // We also need to do the same for |frame|'s next-in-flows that are in // the sibling list. Otherwise, if we reflow |frame| and it's complete // we'll crash when trying to delete its next-in-flow. // This scenario doesn't happen often, but it can happen. nsIFrame* nextSibling = child->GetNextSibling(); child = child->GetNextInFlow(); if (MOZ_UNLIKELY(child)) { while (child != nextSibling && nextSibling) { nextSibling = nextSibling->GetNextSibling(); } if (!nextSibling) { child = nullptr; } } MOZ_ASSERT(!child || mFrames.ContainsFrame(child)); } while (child); // Fix the parent pointer for ::first-letter child frame next-in-flows, // so nsFirstLetterFrame::Reflow can destroy them safely (bug 401042). nsIFrame* realFrame = nsPlaceholderFrame::GetRealFrameFor(frame); if (realFrame->IsLetterFrame()) { nsIFrame* child = realFrame->PrincipalChildList().FirstChild(); if (child) { NS_ASSERTION(child->IsTextFrame(), "unexpected frame type"); nsIFrame* nextInFlow = child->GetNextInFlow(); for (; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) { NS_ASSERTION(nextInFlow->IsTextFrame(), "unexpected frame type"); if (mFrames.ContainsFrame(nextInFlow)) { nextInFlow->SetParent(this); if (inFirstLine) { restyleManager->ReparentComputedStyleForFirstLine(nextInFlow); nsLayoutUtils::MarkDescendantsDirty(nextInFlow); } } else { #ifdef DEBUG // Once we find a next-in-flow that isn't ours none of the // remaining next-in-flows should be either. for (; nextInFlow; nextInFlow = nextInFlow->GetNextInFlow()) { NS_ASSERTION(!mFrames.ContainsFrame(nextInFlow), "unexpected letter frame flow"); } #endif break; } } } } } MOZ_ASSERT(frame->GetParent() == this); if (!done) { bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus); done = aStatus.IsInlineBreak() || (!reflowingFirstLetter && aStatus.IsIncomplete()); if (done) { if (!irs.mSetParentPointer) { break; } // Keep reparenting the remaining siblings, but don't reflow them. nsFrameList* pushedFrames = GetOverflowFrames(); if (pushedFrames && pushedFrames->FirstChild() == frame) { // Don't bother if |frame| was pushed to our overflow list. break; } } else { irs.mPrevFrame = frame; } } frame = frame->GetNextSibling(); } // Attempt to pull frames from our next-in-flow until we can't if (!done && GetNextInFlow()) { while (true) { bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); if (!frame) { // Could be non-null if we pulled a first-letter frame and // it created a continuation, since we don't push those. frame = PullOneFrame(aPresContext, irs); } #ifdef NOISY_PUSHING printf("%p pulled up %p\n", this, frame); #endif if (!frame) { break; } ReflowInlineFrame(aPresContext, aReflowInput, irs, frame, aStatus); if (aStatus.IsInlineBreak() || (!reflowingFirstLetter && aStatus.IsIncomplete())) { break; } irs.mPrevFrame = frame; frame = frame->GetNextSibling(); } } NS_ASSERTION(!aStatus.IsComplete() || !GetOverflowFrames(), "We can't be complete AND have overflow frames!"); // If after reflowing our children they take up no area then make // sure that we don't either. // // Note: CSS demands that empty inline elements still affect the // line-height calculations. However, continuations of an inline // that are empty we force to empty so that things like collapsed // whitespace in an inline element don't affect the line-height. aMetrics.ISize(lineWM) = lineLayout->EndSpan(this); // Compute final width. // XXX Note that that the padding start and end are in the frame's // writing mode, but the metrics' inline-size is in the line's // writing mode. This makes sense if the line and frame are both // vertical or both horizontal, but what should happen with // orthogonal inlines? // Make sure to not include our start border and padding if we have a prev // continuation or if we're in a part of an {ib} split other than the first // one. For box-decoration-break:clone we always include our start border // and padding since all continuations have them. if ((!GetPrevContinuation() && !FrameIsNonFirstInIBSplit()) || boxDecorationBreakClone) { aMetrics.ISize(lineWM) += framePadding.IStart(frameWM); } /* * We want to only apply the end border and padding if we're the last * continuation and either not in an {ib} split or the last part of it. To * be the last continuation we have to be complete (so that we won't get a * next-in-flow) and have no non-fluid continuations on our continuation * chain. For box-decoration-break:clone we always apply the end border and * padding since all continuations have them. */ if ((aStatus.IsComplete() && !LastInFlow()->GetNextContinuation() && !FrameIsNonLastInIBSplit()) || boxDecorationBreakClone) { aMetrics.ISize(lineWM) += framePadding.IEnd(frameWM); } nsLayoutUtils::SetBSizeFromFontMetrics(this, aMetrics, framePadding, lineWM, frameWM); // For now our overflow area is zero. The real value will be // computed in |nsLineLayout::RelativePositionFrames|. aMetrics.mOverflowAreas.Clear(); #ifdef NOISY_FINAL_SIZE ListTag(stdout); printf(": metrics=%d,%d ascent=%d\n", aMetrics.Width(), aMetrics.Height(), aMetrics.TopAscent()); #endif } // Returns whether there's any remaining frame to pull. /* static */ bool nsInlineFrame::HasFramesToPull(nsInlineFrame* aNextInFlow) { while (aNextInFlow) { if (!aNextInFlow->mFrames.IsEmpty()) { return true; } if (const nsFrameList* overflow = aNextInFlow->GetOverflowFrames()) { if (!overflow->IsEmpty()) { return true; } } aNextInFlow = static_cast(aNextInFlow->GetNextInFlow()); } return false; } void nsInlineFrame::ReflowInlineFrame(nsPresContext* aPresContext, const ReflowInput& aReflowInput, InlineReflowInput& irs, nsIFrame* aFrame, nsReflowStatus& aStatus) { nsLineLayout* lineLayout = aReflowInput.mLineLayout; bool reflowingFirstLetter = lineLayout->GetFirstLetterStyleOK(); bool pushedFrame; aStatus.Reset(); lineLayout->ReflowFrame(aFrame, aStatus, nullptr, pushedFrame); if (aStatus.IsInlineBreakBefore()) { if (aFrame != mFrames.FirstChild()) { // Change break-before status into break-after since we have // already placed at least one child frame. This preserves the // break-type so that it can be propagated upward. StyleClear oldBreakType = aStatus.BreakType(); aStatus.Reset(); aStatus.SetIncomplete(); aStatus.SetInlineLineBreakAfter(oldBreakType); PushFrames(aPresContext, aFrame, irs.mPrevFrame, irs); } else { // Preserve reflow status when breaking-before our first child // and propagate it upward without modification. } return; } // Create a next-in-flow if needed. if (!aStatus.IsFullyComplete()) { CreateNextInFlow(aFrame); } if (aStatus.IsInlineBreakAfter()) { nsIFrame* nextFrame = aFrame->GetNextSibling(); if (nextFrame) { aStatus.SetIncomplete(); PushFrames(aPresContext, nextFrame, aFrame, irs); } else { // We must return an incomplete status if there are more child // frames remaining in a next-in-flow that follows this frame. if (HasFramesToPull(static_cast(GetNextInFlow()))) { aStatus.SetIncomplete(); } } return; } if (!aStatus.IsFullyComplete() && !reflowingFirstLetter) { nsIFrame* nextFrame = aFrame->GetNextSibling(); if (nextFrame) { PushFrames(aPresContext, nextFrame, aFrame, irs); } } } nsIFrame* nsInlineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowInput& irs) { nsIFrame* frame = nullptr; nsInlineFrame* nextInFlow = irs.mNextInFlow; #ifdef DEBUG bool willPull = HasFramesToPull(nextInFlow); #endif while (nextInFlow) { frame = nextInFlow->mFrames.FirstChild(); if (!frame) { // The nextInFlow's principal list has no frames, try its overflow list. nsFrameList* overflowFrames = nextInFlow->GetOverflowFrames(); if (overflowFrames) { frame = overflowFrames->RemoveFirstChild(); if (overflowFrames->IsEmpty()) { // We're stealing the only frame - delete the overflow list. nextInFlow->DestroyOverflowList(); } else { // We leave the remaining frames on the overflow list (rather than // putting them on nextInFlow's principal list) so we don't have to // set up the parent for them. } // ReparentFloatsForInlineChild needs it to be on a child list - // we remove it again below. nextInFlow->mFrames.SetFrames(frame); } } if (frame) { // If our block has no next continuation, then any floats belonging to // the pulled frame must belong to our block already. This check ensures // we do no extra work in the common non-vertical-breaking case. if (irs.mLineContainer && irs.mLineContainer->GetNextContinuation()) { // The blockChildren.ContainsFrame check performed by // ReparentFloatsForInlineChild will be fast because frame's ancestor // will be the first child of its containing block. ReparentFloatsForInlineChild(irs.mLineContainer, frame, false); } nextInFlow->mFrames.RemoveFirstChild(); // nsFirstLineFrame::PullOneFrame calls ReparentComputedStyle. mFrames.InsertFrame(this, irs.mPrevFrame, frame); if (irs.mLineLayout) { irs.mLineLayout->SetDirtyNextLine(); } nsContainerFrame::ReparentFrameView(frame, nextInFlow, this); break; } nextInFlow = static_cast(nextInFlow->GetNextInFlow()); irs.mNextInFlow = nextInFlow; } MOZ_ASSERT(!!frame == willPull); return frame; } void nsInlineFrame::PushFrames(nsPresContext* aPresContext, nsIFrame* aFromChild, nsIFrame* aPrevSibling, InlineReflowInput& aState) { #ifdef NOISY_PUSHING printf("%p pushing aFromChild %p, disconnecting from prev sib %p\n", this, aFromChild, aPrevSibling); #endif PushChildrenToOverflow(aFromChild, aPrevSibling); if (aState.mLineLayout) { aState.mLineLayout->SetDirtyNextLine(); } } ////////////////////////////////////////////////////////////////////// LogicalSides nsInlineFrame::GetLogicalSkipSides() const { LogicalSides skip(mWritingMode); if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak == StyleBoxDecorationBreak::Clone)) { return skip; } if (!IsFirst()) { nsInlineFrame* prev = (nsInlineFrame*)GetPrevContinuation(); if (HasAnyStateBits(NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) || (prev && (prev->mRect.height || prev->mRect.width))) { // Prev continuation is not empty therefore we don't render our start // border edge. skip |= eLogicalSideBitsIStart; } else { // If the prev continuation is empty, then go ahead and let our start // edge border render. } } if (!IsLast()) { nsInlineFrame* next = (nsInlineFrame*)GetNextContinuation(); if (HasAnyStateBits(NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET) || (next && (next->mRect.height || next->mRect.width))) { // Next continuation is not empty therefore we don't render our end // border edge. skip |= eLogicalSideBitsIEnd; } else { // If the next continuation is empty, then go ahead and let our end // edge border render. } } if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) { // All but the last part of an {ib} split should skip the "end" side (as // determined by this frame's direction) and all but the first part of such // a split should skip the "start" side. But figuring out which part of // the split we are involves getting our first continuation, which might be // expensive. So don't bother if we already have the relevant bits set. if (skip != LogicalSides(mWritingMode, eLogicalSideBitsIBoth)) { // We're missing one of the skip bits, so check whether we need to set it. // Only get the first continuation once, as an optimization. nsIFrame* firstContinuation = FirstContinuation(); if (firstContinuation->FrameIsNonLastInIBSplit()) { skip |= eLogicalSideBitsIEnd; } if (firstContinuation->FrameIsNonFirstInIBSplit()) { skip |= eLogicalSideBitsIStart; } } } return skip; } nscoord nsInlineFrame::GetLogicalBaseline( mozilla::WritingMode aWritingMode) const { return mBaseline; } #ifdef ACCESSIBILITY a11y::AccType nsInlineFrame::AccessibleType() { // FIXME(emilio): This is broken, if the image has its default `display` value // overridden. Should be somewhere else. if (mContent->IsHTMLElement( nsGkAtoms::img)) // Create accessible for broken return a11y::eHyperTextType; return a11y::eNoType; } #endif void nsInlineFrame::UpdateStyleOfOwnedAnonBoxesForIBSplit( ServoRestyleState& aRestyleState) { MOZ_ASSERT(HasAnyStateBits(NS_FRAME_OWNS_ANON_BOXES), "Why did we get called?"); MOZ_ASSERT(HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT), "Why did we have the NS_FRAME_OWNS_ANON_BOXES bit set?"); // Note: this assert _looks_ expensive, but it's cheap in all the cases when // it passes! MOZ_ASSERT(nsLayoutUtils::FirstContinuationOrIBSplitSibling(this) == this, "Only the primary frame of the inline in a block-inside-inline " "split should have NS_FRAME_OWNS_ANON_BOXES"); MOZ_ASSERT(mContent->GetPrimaryFrame() == this, "We should be the primary frame for our element"); nsIFrame* blockFrame = GetProperty(nsIFrame::IBSplitSibling()); MOZ_ASSERT(blockFrame, "Why did we have an IB split?"); // The later inlines need to get our style. ComputedStyle* ourStyle = Style(); // The anonymous block's style inherits from ours, and we already have our new // ComputedStyle. RefPtr newContext = aRestyleState.StyleSet().ResolveInheritingAnonymousBoxStyle( PseudoStyleType::mozBlockInsideInlineWrapper, ourStyle); // We're guaranteed that newContext only differs from the old ComputedStyle on // the block in things they might inherit from us. And changehint processing // guarantees walking the continuation and ib-sibling chains, so our existing // changehint being in aChangeList is good enough. So we don't need to touch // aChangeList at all here. while (blockFrame) { MOZ_ASSERT(!blockFrame->GetPrevContinuation(), "Must be first continuation"); MOZ_ASSERT(blockFrame->Style()->GetPseudoType() == PseudoStyleType::mozBlockInsideInlineWrapper, "Unexpected kind of ComputedStyle"); for (nsIFrame* cont = blockFrame; cont; cont = cont->GetNextContinuation()) { cont->SetComputedStyle(newContext); } nsIFrame* nextInline = blockFrame->GetProperty(nsIFrame::IBSplitSibling()); // This check is here due to bug 1431232. Please remove it once // that bug is fixed. if (MOZ_UNLIKELY(!nextInline)) { break; } MOZ_ASSERT(nextInline, "There is always a trailing inline in an IB split"); for (nsIFrame* cont = nextInline; cont; cont = cont->GetNextContinuation()) { cont->SetComputedStyle(ourStyle); } blockFrame = nextInline->GetProperty(nsIFrame::IBSplitSibling()); } } ////////////////////////////////////////////////////////////////////// // nsLineFrame implementation nsFirstLineFrame* NS_NewFirstLineFrame(PresShell* aPresShell, ComputedStyle* aStyle) { return new (aPresShell) nsFirstLineFrame(aStyle, aPresShell->GetPresContext()); } NS_IMPL_FRAMEARENA_HELPERS(nsFirstLineFrame) void nsFirstLineFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, nsIFrame* aPrevInFlow) { nsInlineFrame::Init(aContent, aParent, aPrevInFlow); if (!aPrevInFlow) { MOZ_ASSERT(Style()->GetPseudoType() == PseudoStyleType::firstLine); return; } // This frame is a continuation - fixup the computed style if aPrevInFlow // is the first-in-flow (the only one with a ::first-line pseudo). if (aPrevInFlow->Style()->GetPseudoType() == PseudoStyleType::firstLine) { MOZ_ASSERT(FirstInFlow() == aPrevInFlow); // Create a new ComputedStyle that is a child of the parent // ComputedStyle thus removing the ::first-line style. This way // we behave as if an anonymous (unstyled) span was the child // of the parent frame. ComputedStyle* parentContext = aParent->Style(); RefPtr newSC = PresContext()->StyleSet()->ResolveInheritingAnonymousBoxStyle( PseudoStyleType::mozLineFrame, parentContext); SetComputedStyle(newSC); } else { MOZ_ASSERT(FirstInFlow() != aPrevInFlow); MOZ_ASSERT(aPrevInFlow->Style()->GetPseudoType() == PseudoStyleType::mozLineFrame); } } #ifdef DEBUG_FRAME_DUMP nsresult nsFirstLineFrame::GetFrameName(nsAString& aResult) const { return MakeFrameName(u"Line"_ns, aResult); } #endif nsIFrame* nsFirstLineFrame::PullOneFrame(nsPresContext* aPresContext, InlineReflowInput& irs) { nsIFrame* frame = nsInlineFrame::PullOneFrame(aPresContext, irs); if (frame && !GetPrevInFlow()) { // We are a first-line frame. Fixup the child frames // style-context that we just pulled. NS_ASSERTION(frame->GetParent() == this, "Incorrect parent?"); aPresContext->RestyleManager()->ReparentComputedStyleForFirstLine(frame); nsLayoutUtils::MarkDescendantsDirty(frame); } return frame; } void nsFirstLineFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aMetrics, const ReflowInput& aReflowInput, nsReflowStatus& aStatus) { MarkInReflow(); MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); if (nullptr == aReflowInput.mLineLayout) { return; // XXX does this happen? why? } // Check for an overflow list with our prev-in-flow nsFirstLineFrame* prevInFlow = (nsFirstLineFrame*)GetPrevInFlow(); if (prevInFlow) { AutoFrameListPtr prevOverflowFrames(aPresContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Reparent the new frames and their ComputedStyles. const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); ReparentChildListStyle(aPresContext, newFrames, this); } } // It's also possible that we have an overflow list for ourselves. DrainSelfOverflowList(); // Set our own reflow input (additional state above and beyond aReflowInput). InlineReflowInput irs; irs.mPrevFrame = nullptr; irs.mLineContainer = aReflowInput.mLineLayout->LineContainerFrame(); irs.mLineLayout = aReflowInput.mLineLayout; irs.mNextInFlow = (nsInlineFrame*)GetNextInFlow(); bool wasEmpty = mFrames.IsEmpty(); if (wasEmpty) { // Try to pull over one frame before starting so that we know // whether we have an anonymous block or not. PullOneFrame(aPresContext, irs); } if (nullptr == GetPrevInFlow()) { // XXX This is pretty sick, but what we do here is to pull-up, in // advance, all of the next-in-flows children. We re-resolve their // style while we are at at it so that when we reflow they have // the right style. // // All of this is so that text-runs reflow properly. irs.mPrevFrame = mFrames.LastChild(); for (;;) { nsIFrame* frame = PullOneFrame(aPresContext, irs); if (!frame) { break; } irs.mPrevFrame = frame; } irs.mPrevFrame = nullptr; } NS_ASSERTION(!aReflowInput.mLineLayout->GetInFirstLine(), "Nested first-line frames? BOGUS"); aReflowInput.mLineLayout->SetInFirstLine(true); ReflowFrames(aPresContext, aReflowInput, irs, aMetrics, aStatus); aReflowInput.mLineLayout->SetInFirstLine(false); ReflowAbsoluteFrames(aPresContext, aMetrics, aReflowInput, aStatus); // Note: the line layout code will properly compute our overflow state for us } /* virtual */ void nsFirstLineFrame::PullOverflowsFromPrevInFlow() { nsFirstLineFrame* prevInFlow = static_cast(GetPrevInFlow()); if (prevInFlow) { nsPresContext* presContext = PresContext(); AutoFrameListPtr prevOverflowFrames(presContext, prevInFlow->StealOverflowFrames()); if (prevOverflowFrames) { // Assume that our prev-in-flow has the same line container that we do. const nsFrameList::Slice& newFrames = mFrames.InsertFrames(this, nullptr, *prevOverflowFrames); ReparentChildListStyle(presContext, newFrames, this); } } } /* virtual */ bool nsFirstLineFrame::DrainSelfOverflowList() { AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames()); if (overflowFrames) { bool result = !overflowFrames->IsEmpty(); const nsFrameList::Slice& newFrames = mFrames.AppendFrames(nullptr, *overflowFrames); ReparentChildListStyle(PresContext(), newFrames, this); return result; } return false; }