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Diffstat (limited to 'layout/generic/nsInlineFrame.cpp')
| -rw-r--r-- | layout/generic/nsInlineFrame.cpp | 1083 |
1 files changed, 1083 insertions, 0 deletions
diff --git a/layout/generic/nsInlineFrame.cpp b/layout/generic/nsInlineFrame.cpp new file mode 100644 index 0000000000..7a99ecbe5d --- /dev/null +++ b/layout/generic/nsInlineFrame.cpp @@ -0,0 +1,1083 @@ +/* -*- 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 "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 (IsInSVGTextSubtree()) { + 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 (IsInSVGTextSubtree()) { + 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::Destroy(DestroyContext& aContext) { + 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::Destroy(aContext); +} + +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<nsInlineFrame*>(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) { + DoInlineMinISize(aRenderingContext, aData); +} + +/* virtual */ +void nsInlineFrame::AddInlinePrefISize(gfxContext* aRenderingContext, + nsIFrame::InlinePrefISizeData* aData) { + DoInlinePrefISize(aRenderingContext, aData); +} + +/* virtual */ +nsIFrame::SizeComputationResult nsInlineFrame::ComputeSize( + gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize, + nscoord aAvailableISize, const LogicalSize& aMargin, + const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides, + 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 (nsIFrame* f : aFrames) { + NS_ASSERTION(f->GetParent() == aParentFrame, "Bogus parentage"); + restyleManager->ReparentComputedStyleForFirstLine(f); + nsLayoutUtils::MarkDescendantsDirty(f); + } +} + +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 (!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 = std::move(*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, std::move(*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. +} + +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 (IsInSVGTextSubtree()) { + SVGTextFrame* f = static_cast<SVGTextFrame*>( + 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, std::move(*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<nsInlineFrame*>(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, std::move(*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.BlockStartAscent()); +#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<nsInlineFrame*>(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 oldClearType = aStatus.FloatClearType(); + aStatus.Reset(); + aStatus.SetIncomplete(); + aStatus.SetInlineLineBreakAfter(oldClearType); + 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<nsInlineFrame*>(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 = nsFrameList(frame, 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<nsInlineFrame*>(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; +} + +Maybe<nscoord> nsInlineFrame::GetNaturalBaselineBOffset( + WritingMode aWM, BaselineSharingGroup aBaselineGroup, + BaselineExportContext) const { + if (aBaselineGroup == BaselineSharingGroup::Last) { + return Nothing{}; + } + return Some(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 <img> + 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<ComputedStyle> 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<ComputedStyle> 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, std::move(*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<nsFirstLineFrame*>(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, std::move(*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, std::move(*overflowFrames)); + ReparentChildListStyle(PresContext(), newFrames, this); + return result; + } + return false; +} |