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fune/layout/generic/nsInlineFrame.cpp
David Shin 267a479339 Bug 1809568 - Part 2: Provide GetNaturalBaselineBOffset with baseline export context. r=emilio 
Some baseline exports are context-sensitive. One example: In line-layout scenario,
the last baseline of a scroll container is always the margin-end. In other (e.g.
flex, grid) scenarios, it's the border-box clamped offset to the last line in the
container.
This enables the required 3 different behaviours for `inline-block` scroll containers
for 3 different `baseline-source` values:
- `auto`: Last baseline, margin-end
- `first`: Border-box clamped offset to the first line
- `last`: Border-box clamped offset to the last line

Differential Revision: https://phabricator.services.mozilla.com/D173886
2023-05-17 12:56:54 +00:00

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/* -*- 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::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<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;
}
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