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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
/* state and methods used while laying out a single line of a block frame */
#include "nsLineLayout.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/SVGTextFrame.h"
#include "LayoutLogging.h"
#include "nsBlockFrame.h"
#include "nsFontMetrics.h"
#include "nsStyleConsts.h"
#include "nsContainerFrame.h"
#include "nsFloatManager.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsLayoutUtils.h"
#include "nsTextFrame.h"
#include "nsStyleStructInlines.h"
#include "nsBidiPresUtils.h"
#include "nsRubyFrame.h"
#include "nsRubyTextFrame.h"
#include "RubyUtils.h"
#include <algorithm>
#ifdef DEBUG
# undef NOISY_INLINEDIR_ALIGN
# undef NOISY_BLOCKDIR_ALIGN
# undef NOISY_REFLOW
# undef REALLY_NOISY_REFLOW
# undef NOISY_PUSHING
# undef REALLY_NOISY_PUSHING
# undef NOISY_CAN_PLACE_FRAME
# undef NOISY_TRIM
# undef REALLY_NOISY_TRIM
#endif
using namespace mozilla;
//----------------------------------------------------------------------
nsLineLayout::nsLineLayout(nsPresContext* aPresContext,
nsFloatManager* aFloatManager,
const ReflowInput& aLineContainerRI,
const nsLineList::iterator* aLine,
nsLineLayout* aBaseLineLayout)
: mPresContext(aPresContext),
mFloatManager(aFloatManager),
mLineContainerRI(aLineContainerRI),
mBaseLineLayout(aBaseLineLayout),
mLastOptionalBreakFrame(nullptr),
mForceBreakFrame(nullptr),
mLastOptionalBreakPriority(gfxBreakPriority::eNoBreak),
mLastOptionalBreakFrameOffset(-1),
mForceBreakFrameOffset(-1),
mMinLineBSize(0),
mTextIndent(0),
mMaxStartBoxBSize(0),
mMaxEndBoxBSize(0),
mFinalLineBSize(0),
mFirstLetterStyleOK(false),
mIsTopOfPage(false),
mImpactedByFloats(false),
mLastFloatWasLetterFrame(false),
mLineIsEmpty(false),
mLineEndsInBR(false),
mNeedBackup(false),
mInFirstLine(false),
mGotLineBox(false),
mInFirstLetter(false),
mHasMarker(false),
mDirtyNextLine(false),
mLineAtStart(false),
mHasRuby(false),
mSuppressLineWrap(LineContainerFrame()->IsInSVGTextSubtree()),
mUsedOverflowWrap(false)
#ifdef DEBUG
,
mSpansAllocated(0),
mSpansFreed(0),
mFramesAllocated(0),
mFramesFreed(0)
#endif
{
NS_ASSERTION(aFloatManager || LineContainerFrame()->IsLetterFrame(),
"float manager should be present");
MOZ_ASSERT(
!!mBaseLineLayout == LineContainerFrame()->IsRubyTextContainerFrame(),
"Only ruby text container frames have a different base line layout");
MOZ_COUNT_CTOR(nsLineLayout);
// Stash away some style data that we need
nsBlockFrame* blockFrame = do_QueryFrame(LineContainerFrame());
mStyleText = blockFrame ? blockFrame->StyleTextForLineLayout()
: LineContainerFrame()->StyleText();
mLineNumber = 0;
mTotalPlacedFrames = 0;
mBStartEdge = 0;
mTrimmableISize = 0;
mInflationMinFontSize =
nsLayoutUtils::InflationMinFontSizeFor(LineContainerFrame());
// Instead of always pre-initializing the free-lists for frames and
// spans, we do it on demand so that situations that only use a few
// frames and spans won't waste a lot of time in unneeded
// initialization.
mFrameFreeList = nullptr;
mSpanFreeList = nullptr;
mCurrentSpan = mRootSpan = nullptr;
mSpanDepth = 0;
if (aLine) {
mGotLineBox = true;
mLineBox = *aLine;
}
}
nsLineLayout::~nsLineLayout() {
MOZ_COUNT_DTOR(nsLineLayout);
NS_ASSERTION(nullptr == mRootSpan, "bad line-layout user");
}
// Find out if the frame has a non-null prev-in-flow, i.e., whether it
// is a continuation.
inline bool HasPrevInFlow(nsIFrame* aFrame) {
nsIFrame* prevInFlow = aFrame->GetPrevInFlow();
return prevInFlow != nullptr;
}
void nsLineLayout::BeginLineReflow(nscoord aICoord, nscoord aBCoord,
nscoord aISize, nscoord aBSize,
bool aImpactedByFloats, bool aIsTopOfPage,
WritingMode aWritingMode,
const nsSize& aContainerSize,
nscoord aInset) {
NS_ASSERTION(nullptr == mRootSpan, "bad linelayout user");
LAYOUT_WARN_IF_FALSE(aISize != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
#ifdef DEBUG
if ((aISize != NS_UNCONSTRAINEDSIZE) && ABSURD_SIZE(aISize) &&
!LineContainerFrame()->GetParent()->IsAbsurdSizeAssertSuppressed()) {
LineContainerFrame()->ListTag(stdout);
printf(": Init: bad caller: width WAS %d(0x%x)\n", aISize, aISize);
}
if ((aBSize != NS_UNCONSTRAINEDSIZE) && ABSURD_SIZE(aBSize) &&
!LineContainerFrame()->GetParent()->IsAbsurdSizeAssertSuppressed()) {
LineContainerFrame()->ListTag(stdout);
printf(": Init: bad caller: height WAS %d(0x%x)\n", aBSize, aBSize);
}
#endif
#ifdef NOISY_REFLOW
LineContainerFrame()->ListTag(stdout);
printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n", aICoord, aBCoord,
aISize, aBSize, aImpactedByFloats ? "true" : "false",
aIsTopOfPage ? "top-of-page" : "");
#endif
#ifdef DEBUG
mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
#endif
mFirstLetterStyleOK = false;
mIsTopOfPage = aIsTopOfPage;
mImpactedByFloats = aImpactedByFloats;
mTotalPlacedFrames = 0;
if (!mBaseLineLayout) {
mLineIsEmpty = true;
mLineAtStart = true;
} else {
mLineIsEmpty = false;
mLineAtStart = false;
}
mLineEndsInBR = false;
mSpanDepth = 0;
mMaxStartBoxBSize = mMaxEndBoxBSize = 0;
if (mGotLineBox) {
mLineBox->ClearHasMarker();
}
PerSpanData* psd = NewPerSpanData();
mCurrentSpan = mRootSpan = psd;
psd->mReflowInput = &mLineContainerRI;
psd->mIStart = aICoord;
psd->mICoord = aICoord;
psd->mIEnd = aICoord + aISize;
// Set up inset to be used for text-wrap:balance implementation, but only if
// the available size is greater than inset.
psd->mInset = aISize > aInset ? aInset : 0;
mContainerSize = aContainerSize;
mBStartEdge = aBCoord;
psd->mNoWrap = !mStyleText->WhiteSpaceCanWrapStyle() || mSuppressLineWrap;
psd->mWritingMode = aWritingMode;
// Determine if this is the first line of the block (or first after a hard
// line-break, if `each-line` is in effect).
nsIFrame* containerFrame = LineContainerFrame();
if (!containerFrame->IsRubyTextContainerFrame()) {
bool isFirstLineOrAfterHardBreak = [&] {
if (mLineNumber > 0) {
return mStyleText->mTextIndent.each_line && GetLine() &&
!GetLine()->prev()->IsLineWrapped();
}
if (nsBlockFrame* prevBlock =
do_QueryFrame(containerFrame->GetPrevInFlow())) {
return mStyleText->mTextIndent.each_line &&
(prevBlock->Lines().empty() ||
!prevBlock->LinesEnd().prev()->IsLineWrapped());
}
return true;
}();
// Resolve and apply the text-indent value if this line requires it.
// The `hanging` option inverts which lines are to be indented.
if (isFirstLineOrAfterHardBreak != mStyleText->mTextIndent.hanging) {
nscoord pctBasis = mLineContainerRI.ComputedISize();
mTextIndent = mStyleText->mTextIndent.length.Resolve(pctBasis);
psd->mICoord += mTextIndent;
}
}
PerFrameData* pfd = NewPerFrameData(containerFrame);
pfd->mAscent = 0;
pfd->mSpan = psd;
psd->mFrame = pfd;
if (containerFrame->IsRubyTextContainerFrame()) {
// Ruby text container won't be reflowed via ReflowFrame, hence the
// relative positioning information should be recorded here.
MOZ_ASSERT(mBaseLineLayout != this);
pfd->mIsRelativelyOrStickyPos =
mLineContainerRI.mStyleDisplay->IsRelativelyOrStickyPositionedStyle();
if (pfd->mIsRelativelyOrStickyPos) {
MOZ_ASSERT(mLineContainerRI.GetWritingMode() == pfd->mWritingMode,
"mLineContainerRI.frame == frame, "
"hence they should have identical writing mode");
pfd->mOffsets =
mLineContainerRI.ComputedLogicalOffsets(pfd->mWritingMode);
}
}
}
bool nsLineLayout::EndLineReflow() {
#ifdef NOISY_REFLOW
LineContainerFrame()->ListTag(stdout);
printf(": EndLineReflow: width=%d\n",
mRootSpan->mICoord - mRootSpan->mIStart);
#endif
NS_ASSERTION(!mBaseLineLayout ||
(!mSpansAllocated && !mSpansFreed && !mSpanFreeList &&
!mFramesAllocated && !mFramesFreed && !mFrameFreeList),
"Allocated frames or spans on non-base line layout?");
MOZ_ASSERT(mRootSpan == mCurrentSpan);
UnlinkFrame(mRootSpan->mFrame);
mCurrentSpan = mRootSpan = nullptr;
NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");
#if 0
static int32_t maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
static int32_t maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES;
if (mSpansAllocated > maxSpansAllocated) {
printf("XXX: saw a line with %d spans\n", mSpansAllocated);
maxSpansAllocated = mSpansAllocated;
}
if (mFramesAllocated > maxFramesAllocated) {
printf("XXX: saw a line with %d frames\n", mFramesAllocated);
maxFramesAllocated = mFramesAllocated;
}
#endif
return mUsedOverflowWrap;
}
// XXX swtich to a single mAvailLineWidth that we adjust as each frame
// on the line is placed. Each span can still have a per-span mICoord that
// tracks where a child frame is going in its span; they don't need a
// per-span mIStart?
void nsLineLayout::UpdateBand(WritingMode aWM,
const LogicalRect& aNewAvailSpace,
nsIFrame* aFloatFrame) {
WritingMode lineWM = mRootSpan->mWritingMode;
// need to convert to our writing mode, because we might have a different
// mode from the caller due to dir: auto
LogicalRect availSpace =
aNewAvailSpace.ConvertTo(lineWM, aWM, ContainerSize());
#ifdef REALLY_NOISY_REFLOW
printf(
"nsLL::UpdateBand %d, %d, %d, %d, (converted to %d, %d, %d, %d); "
"frame=%p\n will set mImpacted to true\n",
aNewAvailSpace.IStart(aWM), aNewAvailSpace.BStart(aWM),
aNewAvailSpace.ISize(aWM), aNewAvailSpace.BSize(aWM),
availSpace.IStart(lineWM), availSpace.BStart(lineWM),
availSpace.ISize(lineWM), availSpace.BSize(lineWM), aFloatFrame);
#endif
#ifdef DEBUG
if ((availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
ABSURD_SIZE(availSpace.ISize(lineWM)) &&
!LineContainerFrame()->GetParent()->IsAbsurdSizeAssertSuppressed()) {
LineContainerFrame()->ListTag(stdout);
printf(": UpdateBand: bad caller: ISize WAS %d(0x%x)\n",
availSpace.ISize(lineWM), availSpace.ISize(lineWM));
}
if ((availSpace.BSize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
ABSURD_SIZE(availSpace.BSize(lineWM)) &&
!LineContainerFrame()->GetParent()->IsAbsurdSizeAssertSuppressed()) {
LineContainerFrame()->ListTag(stdout);
printf(": UpdateBand: bad caller: BSize WAS %d(0x%x)\n",
availSpace.BSize(lineWM), availSpace.BSize(lineWM));
}
#endif
// Compute the difference between last times width and the new width
NS_WARNING_ASSERTION(
mRootSpan->mIEnd != NS_UNCONSTRAINEDSIZE &&
availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE,
"have unconstrained inline size; this should only result from very large "
"sizes, not attempts at intrinsic width calculation");
// The root span's mIStart moves to aICoord
nscoord deltaICoord = availSpace.IStart(lineWM) - mRootSpan->mIStart;
// The inline size of all spans changes by this much (the root span's
// mIEnd moves to aICoord + aISize, its new inline size is aISize)
nscoord deltaISize =
availSpace.ISize(lineWM) - (mRootSpan->mIEnd - mRootSpan->mIStart);
#ifdef NOISY_REFLOW
LineContainerFrame()->ListTag(stdout);
printf(": UpdateBand: %d,%d,%d,%d deltaISize=%d deltaICoord=%d\n",
availSpace.IStart(lineWM), availSpace.BStart(lineWM),
availSpace.ISize(lineWM), availSpace.BSize(lineWM), deltaISize,
deltaICoord);
#endif
// Update the root span position
mRootSpan->mIStart += deltaICoord;
mRootSpan->mIEnd += deltaICoord;
mRootSpan->mICoord += deltaICoord;
// Now update the right edges of the open spans to account for any
// change in available space width
for (PerSpanData* psd = mCurrentSpan; psd; psd = psd->mParent) {
psd->mIEnd += deltaISize;
psd->mContainsFloat = true;
#ifdef NOISY_REFLOW
printf(" span %p: oldIEnd=%d newIEnd=%d\n", psd, psd->mIEnd - deltaISize,
psd->mIEnd);
#endif
}
NS_ASSERTION(mRootSpan->mContainsFloat &&
mRootSpan->mIStart == availSpace.IStart(lineWM) &&
mRootSpan->mIEnd == availSpace.IEnd(lineWM),
"root span was updated incorrectly?");
// Update frame bounds
// Note: Only adjust the outermost frames (the ones that are direct
// children of the block), not the ones in the child spans. The reason
// is simple: the frames in the spans have coordinates local to their
// parent therefore they are moved when their parent span is moved.
if (deltaICoord != 0) {
for (PerFrameData* pfd = mRootSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
pfd->mBounds.IStart(lineWM) += deltaICoord;
}
}
mBStartEdge = availSpace.BStart(lineWM);
mImpactedByFloats = true;
mLastFloatWasLetterFrame = aFloatFrame->IsLetterFrame();
}
nsLineLayout::PerSpanData* nsLineLayout::NewPerSpanData() {
nsLineLayout* outerLineLayout = GetOutermostLineLayout();
PerSpanData* psd = outerLineLayout->mSpanFreeList;
if (!psd) {
void* mem = outerLineLayout->mArena.Allocate(sizeof(PerSpanData));
psd = reinterpret_cast<PerSpanData*>(mem);
} else {
outerLineLayout->mSpanFreeList = psd->mNextFreeSpan;
}
psd->mParent = nullptr;
psd->mFrame = nullptr;
psd->mFirstFrame = nullptr;
psd->mLastFrame = nullptr;
psd->mContainsFloat = false;
psd->mHasNonemptyContent = false;
#ifdef DEBUG
outerLineLayout->mSpansAllocated++;
#endif
return psd;
}
void nsLineLayout::BeginSpan(nsIFrame* aFrame,
const ReflowInput* aSpanReflowInput,
nscoord aIStart, nscoord aIEnd,
nscoord* aBaseline) {
NS_ASSERTION(aIEnd != NS_UNCONSTRAINEDSIZE,
"should no longer be using unconstrained sizes");
#ifdef NOISY_REFLOW
nsIFrame::IndentBy(stdout, mSpanDepth + 1);
aFrame->ListTag(stdout);
printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aIStart, aIEnd);
#endif
PerSpanData* psd = NewPerSpanData();
// Link up span frame's pfd to point to its child span data
PerFrameData* pfd = mCurrentSpan->mLastFrame;
NS_ASSERTION(pfd->mFrame == aFrame, "huh?");
pfd->mSpan = psd;
// Init new span
psd->mFrame = pfd;
psd->mParent = mCurrentSpan;
psd->mReflowInput = aSpanReflowInput;
psd->mIStart = aIStart;
psd->mICoord = aIStart;
psd->mIEnd = aIEnd;
psd->mInset = 0; // inset applies only to the root span
psd->mBaseline = aBaseline;
nsIFrame* frame = aSpanReflowInput->mFrame;
psd->mNoWrap = !frame->StyleText()->WhiteSpaceCanWrap(frame) ||
mSuppressLineWrap || frame->Style()->ShouldSuppressLineBreak();
psd->mWritingMode = aSpanReflowInput->GetWritingMode();
// Switch to new span
mCurrentSpan = psd;
mSpanDepth++;
}
nscoord nsLineLayout::EndSpan(nsIFrame* aFrame) {
NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span");
#ifdef NOISY_REFLOW
nsIFrame::IndentBy(stdout, mSpanDepth);
aFrame->ListTag(stdout);
printf(": EndSpan width=%d\n", mCurrentSpan->mICoord - mCurrentSpan->mIStart);
#endif
PerSpanData* psd = mCurrentSpan;
MOZ_ASSERT(psd->mParent, "We never call this on the root");
if (psd->mNoWrap && !psd->mParent->mNoWrap) {
FlushNoWrapFloats();
}
nscoord iSizeResult = psd->mLastFrame ? (psd->mICoord - psd->mIStart) : 0;
mSpanDepth--;
mCurrentSpan->mReflowInput = nullptr; // no longer valid so null it out!
mCurrentSpan = mCurrentSpan->mParent;
return iSizeResult;
}
void nsLineLayout::AttachFrameToBaseLineLayout(PerFrameData* aFrame) {
MOZ_ASSERT(mBaseLineLayout,
"This method must not be called in a base line layout.");
PerFrameData* baseFrame = mBaseLineLayout->LastFrame();
MOZ_ASSERT(aFrame && baseFrame);
MOZ_ASSERT(!aFrame->mIsLinkedToBase,
"The frame must not have been linked with the base");
#ifdef DEBUG
LayoutFrameType baseType = baseFrame->mFrame->Type();
LayoutFrameType annotationType = aFrame->mFrame->Type();
MOZ_ASSERT((baseType == LayoutFrameType::RubyBaseContainer &&
annotationType == LayoutFrameType::RubyTextContainer) ||
(baseType == LayoutFrameType::RubyBase &&
annotationType == LayoutFrameType::RubyText));
#endif
aFrame->mNextAnnotation = baseFrame->mNextAnnotation;
baseFrame->mNextAnnotation = aFrame;
aFrame->mIsLinkedToBase = true;
}
int32_t nsLineLayout::GetCurrentSpanCount() const {
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
int32_t count = 0;
PerFrameData* pfd = mRootSpan->mFirstFrame;
while (nullptr != pfd) {
count++;
pfd = pfd->mNext;
}
return count;
}
void nsLineLayout::SplitLineTo(int32_t aNewCount) {
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
#ifdef REALLY_NOISY_PUSHING
printf("SplitLineTo %d (current count=%d); before:\n", aNewCount,
GetCurrentSpanCount());
DumpPerSpanData(mRootSpan, 1);
#endif
PerSpanData* psd = mRootSpan;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
if (--aNewCount == 0) {
// Truncate list at pfd (we keep pfd, but anything following is freed)
PerFrameData* next = pfd->mNext;
pfd->mNext = nullptr;
psd->mLastFrame = pfd;
// Now unlink all of the frames following pfd
UnlinkFrame(next);
break;
}
pfd = pfd->mNext;
}
#ifdef NOISY_PUSHING
printf("SplitLineTo %d (current count=%d); after:\n", aNewCount,
GetCurrentSpanCount());
DumpPerSpanData(mRootSpan, 1);
#endif
}
void nsLineLayout::PushFrame(nsIFrame* aFrame) {
PerSpanData* psd = mCurrentSpan;
NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame");
#ifdef REALLY_NOISY_PUSHING
nsIFrame::IndentBy(stdout, mSpanDepth);
printf("PushFrame %p, before:\n", psd);
DumpPerSpanData(psd, 1);
#endif
// Take the last frame off of the span's frame list
PerFrameData* pfd = psd->mLastFrame;
if (pfd == psd->mFirstFrame) {
// We are pushing away the only frame...empty the list
psd->mFirstFrame = nullptr;
psd->mLastFrame = nullptr;
} else {
PerFrameData* prevFrame = pfd->mPrev;
prevFrame->mNext = nullptr;
psd->mLastFrame = prevFrame;
}
// Now unlink the frame
MOZ_ASSERT(!pfd->mNext);
UnlinkFrame(pfd);
#ifdef NOISY_PUSHING
nsIFrame::IndentBy(stdout, mSpanDepth);
printf("PushFrame: %p after:\n", psd);
DumpPerSpanData(psd, 1);
#endif
}
void nsLineLayout::UnlinkFrame(PerFrameData* pfd) {
while (nullptr != pfd) {
PerFrameData* next = pfd->mNext;
if (pfd->mIsLinkedToBase) {
// This frame is linked to a ruby base, and should not be freed
// now. Just unlink it from the span. It will be freed when its
// base frame gets unlinked.
pfd->mNext = pfd->mPrev = nullptr;
pfd = next;
continue;
}
// It is a ruby base frame. If there are any annotations
// linked to this frame, free them first.
PerFrameData* annotationPFD = pfd->mNextAnnotation;
while (annotationPFD) {
PerFrameData* nextAnnotation = annotationPFD->mNextAnnotation;
MOZ_ASSERT(
annotationPFD->mNext == nullptr && annotationPFD->mPrev == nullptr,
"PFD in annotations should have been unlinked.");
FreeFrame(annotationPFD);
annotationPFD = nextAnnotation;
}
FreeFrame(pfd);
pfd = next;
}
}
void nsLineLayout::FreeFrame(PerFrameData* pfd) {
if (nullptr != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
nsLineLayout* outerLineLayout = GetOutermostLineLayout();
pfd->mNext = outerLineLayout->mFrameFreeList;
outerLineLayout->mFrameFreeList = pfd;
#ifdef DEBUG
outerLineLayout->mFramesFreed++;
#endif
}
void nsLineLayout::FreeSpan(PerSpanData* psd) {
// Unlink its frames
UnlinkFrame(psd->mFirstFrame);
nsLineLayout* outerLineLayout = GetOutermostLineLayout();
// Now put the span on the free list since it's free too
psd->mNextFreeSpan = outerLineLayout->mSpanFreeList;
outerLineLayout->mSpanFreeList = psd;
#ifdef DEBUG
outerLineLayout->mSpansFreed++;
#endif
}
bool nsLineLayout::IsZeroBSize() {
PerSpanData* psd = mCurrentSpan;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
if (0 != pfd->mBounds.BSize(psd->mWritingMode)) {
return false;
}
pfd = pfd->mNext;
}
return true;
}
nsLineLayout::PerFrameData* nsLineLayout::NewPerFrameData(nsIFrame* aFrame) {
nsLineLayout* outerLineLayout = GetOutermostLineLayout();
PerFrameData* pfd = outerLineLayout->mFrameFreeList;
if (!pfd) {
void* mem = outerLineLayout->mArena.Allocate(sizeof(PerFrameData));
pfd = reinterpret_cast<PerFrameData*>(mem);
} else {
outerLineLayout->mFrameFreeList = pfd->mNext;
}
pfd->mSpan = nullptr;
pfd->mNext = nullptr;
pfd->mPrev = nullptr;
pfd->mNextAnnotation = nullptr;
pfd->mFrame = aFrame;
// all flags default to false
pfd->mIsRelativelyOrStickyPos = false;
pfd->mIsTextFrame = false;
pfd->mIsNonEmptyTextFrame = false;
pfd->mIsNonWhitespaceTextFrame = false;
pfd->mIsLetterFrame = false;
pfd->mRecomputeOverflow = false;
pfd->mIsMarker = false;
pfd->mSkipWhenTrimmingWhitespace = false;
pfd->mIsEmpty = false;
pfd->mIsPlaceholder = false;
pfd->mIsLinkedToBase = false;
pfd->mWritingMode = aFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
pfd->mBounds = LogicalRect(lineWM);
pfd->mOverflowAreas.Clear();
pfd->mMargin = LogicalMargin(lineWM);
pfd->mBorderPadding = LogicalMargin(lineWM);
pfd->mOffsets = LogicalMargin(pfd->mWritingMode);
pfd->mJustificationInfo = JustificationInfo();
pfd->mJustificationAssignment = JustificationAssignment();
#ifdef DEBUG
pfd->mBlockDirAlign = 0xFF;
outerLineLayout->mFramesAllocated++;
#endif
return pfd;
}
bool nsLineLayout::LineIsBreakable() const {
// XXX mTotalPlacedFrames should go away and we should just use
// mLineIsEmpty here instead
if ((0 != mTotalPlacedFrames) || mImpactedByFloats) {
return true;
}
return false;
}
// Checks all four sides for percentage units. This means it should
// only be used for things (margin, padding) where percentages on top
// and bottom depend on the *width* just like percentages on left and
// right.
template <typename T>
static bool HasPercentageUnitSide(const StyleRect<T>& aSides) {
return aSides.Any([](const auto& aLength) { return aLength.HasPercent(); });
}
static bool IsPercentageAware(const nsIFrame* aFrame, WritingMode aWM) {
NS_ASSERTION(aFrame, "null frame is not allowed");
LayoutFrameType fType = aFrame->Type();
if (fType == LayoutFrameType::Text) {
// None of these things can ever be true for text frames.
return false;
}
// Some of these things don't apply to non-replaced inline frames
// (that is, fType == LayoutFrameType::Inline), but we won't bother making
// things unnecessarily complicated, since they'll probably be set
// quite rarely.
const nsStyleMargin* margin = aFrame->StyleMargin();
if (HasPercentageUnitSide(margin->mMargin)) {
return true;
}
const nsStylePadding* padding = aFrame->StylePadding();
if (HasPercentageUnitSide(padding->mPadding)) {
return true;
}
// Note that borders can't be aware of percentages
const nsStylePosition* pos = aFrame->StylePosition();
if ((pos->ISizeDependsOnContainer(aWM) && !pos->ISize(aWM).IsAuto()) ||
pos->MaxISizeDependsOnContainer(aWM) ||
pos->MinISizeDependsOnContainer(aWM) ||
pos->mOffset.GetIStart(aWM).HasPercent() ||
pos->mOffset.GetIEnd(aWM).HasPercent()) {
return true;
}
if (pos->ISize(aWM).IsAuto()) {
// We need to check for frames that shrink-wrap when they're auto
// width.
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if ((disp->DisplayOutside() == StyleDisplayOutside::Inline &&
(disp->DisplayInside() == StyleDisplayInside::FlowRoot ||
disp->DisplayInside() == StyleDisplayInside::Table)) ||
fType == LayoutFrameType::HTMLButtonControl ||
fType == LayoutFrameType::GfxButtonControl ||
fType == LayoutFrameType::FieldSet) {
return true;
}
// Per CSS 2.1, section 10.3.2:
// If 'height' and 'width' both have computed values of 'auto' and
// the element has an intrinsic ratio but no intrinsic height or
// width and the containing block's width does not itself depend
// on the replaced element's width, then the used value of 'width'
// is calculated from the constraint equation used for
// block-level, non-replaced elements in normal flow.
nsIFrame* f = const_cast<nsIFrame*>(aFrame);
if (f->GetAspectRatio() &&
// Some percents are treated like 'auto', so check != coord
!pos->BSize(aWM).ConvertsToLength()) {
const IntrinsicSize& intrinsicSize = f->GetIntrinsicSize();
if (!intrinsicSize.width && !intrinsicSize.height) {
return true;
}
}
}
return false;
}
void nsLineLayout::ReflowFrame(nsIFrame* aFrame, nsReflowStatus& aReflowStatus,
ReflowOutput* aMetrics, bool& aPushedFrame) {
// Initialize OUT parameter
aPushedFrame = false;
PerFrameData* pfd = NewPerFrameData(aFrame);
PerSpanData* psd = mCurrentSpan;
psd->AppendFrame(pfd);
#ifdef REALLY_NOISY_REFLOW
nsIFrame::IndentBy(stdout, mSpanDepth);
printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
aFrame->ListTag(stdout);
printf("\n");
#endif
if (mCurrentSpan == mRootSpan) {
pfd->mFrame->RemoveProperty(nsIFrame::LineBaselineOffset());
} else {
#ifdef DEBUG
bool hasLineOffset;
pfd->mFrame->GetProperty(nsIFrame::LineBaselineOffset(), &hasLineOffset);
NS_ASSERTION(!hasLineOffset,
"LineBaselineOffset was set but was not expected");
#endif
}
mJustificationInfo = JustificationInfo();
// Stash copies of some of the computed state away for later
// (block-direction alignment, for example)
WritingMode frameWM = pfd->mWritingMode;
WritingMode lineWM = mRootSpan->mWritingMode;
// NOTE: While the inline direction coordinate remains relative to the
// parent span, the block direction coordinate is fixed at the top
// edge for the line. During VerticalAlignFrames we will repair this
// so that the block direction coordinate is properly set and relative
// to the appropriate span.
pfd->mBounds.IStart(lineWM) = psd->mICoord;
pfd->mBounds.BStart(lineWM) = mBStartEdge;
// We want to guarantee that we always make progress when
// formatting. Therefore, if the object being placed on the line is
// too big for the line, but it is the only thing on the line and is not
// impacted by a float, then we go ahead and place it anyway. (If the line
// is impacted by one or more floats, then it is safe to break because
// we can move the line down below float(s).)
//
// Capture this state *before* we reflow the frame in case it clears
// the state out. We need to know how to treat the current frame
// when breaking.
bool notSafeToBreak = LineIsEmpty() && !mImpactedByFloats;
// Figure out whether we're talking about a textframe here
LayoutFrameType frameType = aFrame->Type();
const bool isText = frameType == LayoutFrameType::Text;
// Inline-ish and text-ish things don't compute their width;
// everything else does. We need to give them an available width that
// reflects the space left on the line.
LAYOUT_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
nscoord availableSpaceOnLine = psd->mIEnd - psd->mICoord - psd->mInset;
// Setup reflow input for reflowing the frame
Maybe<ReflowInput> reflowInputHolder;
if (!isText) {
// Compute the available size for the frame. This available width
// includes room for the side margins.
// For now, set the available block-size to unconstrained always.
LogicalSize availSize = mLineContainerRI.ComputedSize(frameWM);
availSize.BSize(frameWM) = NS_UNCONSTRAINEDSIZE;
reflowInputHolder.emplace(mPresContext, *psd->mReflowInput, aFrame,
availSize);
ReflowInput& reflowInput = *reflowInputHolder;
reflowInput.mLineLayout = this;
reflowInput.mFlags.mIsTopOfPage = mIsTopOfPage;
if (reflowInput.ComputedISize() == NS_UNCONSTRAINEDSIZE) {
reflowInput.SetAvailableISize(availableSpaceOnLine);
}
pfd->mMargin = reflowInput.ComputedLogicalMargin(lineWM);
pfd->mBorderPadding = reflowInput.ComputedLogicalBorderPadding(lineWM);
pfd->mIsRelativelyOrStickyPos =
reflowInput.mStyleDisplay->IsRelativelyOrStickyPositionedStyle();
if (pfd->mIsRelativelyOrStickyPos) {
pfd->mOffsets = reflowInput.ComputedLogicalOffsets(frameWM);
}
// Calculate whether the the frame should have a start margin and
// subtract the margin from the available width if necessary.
// The margin will be applied to the starting inline coordinates of
// the frame in CanPlaceFrame() after reflowing the frame.
AllowForStartMargin(pfd, reflowInput);
}
// if isText(), no need to propagate NS_FRAME_IS_DIRTY from the parent,
// because reflow doesn't look at the dirty bits on the frame being reflowed.
// See if this frame depends on the inline-size of its containing block.
// If so, disable resize reflow optimizations for the line. (Note that,
// to be conservative, we do this if we *try* to fit a frame on a
// line, even if we don't succeed.) (Note also that we can only make
// this IsPercentageAware check *after* we've constructed our
// ReflowInput, because that construction may be what forces aFrame
// to lazily initialize its (possibly-percent-valued) intrinsic size.)
if (mGotLineBox && IsPercentageAware(aFrame, lineWM)) {
mLineBox->DisableResizeReflowOptimization();
}
// Note that we don't bother positioning the frame yet, because we're probably
// going to end up moving it when we do the block-direction alignment.
// Adjust float manager coordinate system for the frame.
ReflowOutput reflowOutput(lineWM);
#ifdef DEBUG
reflowOutput.ISize(lineWM) = nscoord(0xdeadbeef);
reflowOutput.BSize(lineWM) = nscoord(0xdeadbeef);
#endif
nscoord tI = pfd->mBounds.LineLeft(lineWM, ContainerSize());
nscoord tB = pfd->mBounds.BStart(lineWM);
mFloatManager->Translate(tI, tB);
int32_t savedOptionalBreakOffset;
gfxBreakPriority savedOptionalBreakPriority;
nsIFrame* savedOptionalBreakFrame = GetLastOptionalBreakPosition(
&savedOptionalBreakOffset, &savedOptionalBreakPriority);
if (!isText) {
aFrame->Reflow(mPresContext, reflowOutput, *reflowInputHolder,
aReflowStatus);
} else {
static_cast<nsTextFrame*>(aFrame)->ReflowText(
*this, availableSpaceOnLine,
psd->mReflowInput->mRenderingContext->GetDrawTarget(), reflowOutput,
aReflowStatus);
}
pfd->mJustificationInfo = mJustificationInfo;
mJustificationInfo = JustificationInfo();
// See if the frame is a placeholderFrame and if it is process
// the float. At the same time, check if the frame has any non-collapsed-away
// content.
bool placedFloat = false;
bool isEmpty;
if (frameType == LayoutFrameType::None) {
isEmpty = pfd->mFrame->IsEmpty();
} else if (LayoutFrameType::Placeholder == frameType) {
isEmpty = true;
pfd->mIsPlaceholder = true;
pfd->mSkipWhenTrimmingWhitespace = true;
nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
if (outOfFlowFrame) {
if (psd->mNoWrap &&
// We can always place floats in an empty line.
!LineIsEmpty() &&
// We always place floating letter frames. This kinda sucks. They'd
// usually fall into the LineIsEmpty() check anyway, except when
// there's something like a ::marker before or what not. We actually
// need to place them now, because they're pretty nasty and they
// create continuations that are in flow and not a kid of the
// previous continuation's parent. We don't want the deferred reflow
// of the letter frame to kill a continuation after we've stored it
// underlying issue. When that's fixed this check should be removed.
!outOfFlowFrame->IsLetterFrame() &&
!GetOutermostLineLayout()->mBlockRS->mFlags.mCanHaveOverflowMarkers) {
// We'll do this at the next break opportunity.
RecordNoWrapFloat(outOfFlowFrame);
} else {
placedFloat = TryToPlaceFloat(outOfFlowFrame);
}
}
} else if (isText) {
// Note non-empty text-frames for inline frame compatibility hackery
pfd->mIsTextFrame = true;
auto* textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
isEmpty = !textFrame->HasNoncollapsedCharacters();
if (!isEmpty) {
pfd->mIsNonEmptyTextFrame = true;
pfd->mIsNonWhitespaceTextFrame =
!textFrame->GetContent()->TextIsOnlyWhitespace();
}
} else if (LayoutFrameType::Br == frameType) {
pfd->mSkipWhenTrimmingWhitespace = true;
isEmpty = false;
} else {
if (LayoutFrameType::Letter == frameType) {
pfd->mIsLetterFrame = true;
}
if (pfd->mSpan) {
isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty();
} else {
isEmpty = pfd->mFrame->IsEmpty();
}
}
pfd->mIsEmpty = isEmpty;
mFloatManager->Translate(-tI, -tB);
NS_ASSERTION(reflowOutput.ISize(lineWM) >= 0, "bad inline size");
NS_ASSERTION(reflowOutput.BSize(lineWM) >= 0, "bad block size");
if (reflowOutput.ISize(lineWM) < 0) {
reflowOutput.ISize(lineWM) = 0;
}
if (reflowOutput.BSize(lineWM) < 0) {
reflowOutput.BSize(lineWM) = 0;
}
#ifdef DEBUG
// Note: break-before means ignore the reflow metrics since the
// frame will be reflowed another time.
if (!aReflowStatus.IsInlineBreakBefore()) {
if ((ABSURD_SIZE(reflowOutput.ISize(lineWM)) ||
ABSURD_SIZE(reflowOutput.BSize(lineWM))) &&
!LineContainerFrame()->GetParent()->IsAbsurdSizeAssertSuppressed()) {
printf("nsLineLayout: ");
aFrame->ListTag(stdout);
printf(" metrics=%d,%d!\n", reflowOutput.Width(), reflowOutput.Height());
}
if ((reflowOutput.Width() == nscoord(0xdeadbeef)) ||
(reflowOutput.Height() == nscoord(0xdeadbeef))) {
printf("nsLineLayout: ");
aFrame->ListTag(stdout);
printf(" didn't set w/h %d,%d!\n", reflowOutput.Width(),
reflowOutput.Height());
}
}
#endif
// Unlike with non-inline reflow, the overflow area here does *not*
// include the accumulation of the frame's bounds and its inline
// descendants' bounds. Nor does it include the outline area; it's
// just the union of the bounds of any absolute children. That is
// added in later by nsLineLayout::ReflowInlineFrames.
pfd->mOverflowAreas = reflowOutput.mOverflowAreas;
pfd->mBounds.ISize(lineWM) = reflowOutput.ISize(lineWM);
pfd->mBounds.BSize(lineWM) = reflowOutput.BSize(lineWM);
// Size the frame, but |RelativePositionFrames| will size the view.
aFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
// Tell the frame that we're done reflowing it
aFrame->DidReflow(mPresContext, isText ? nullptr : reflowInputHolder.ptr());
if (aMetrics) {
*aMetrics = reflowOutput;
}
if (!aReflowStatus.IsInlineBreakBefore()) {
// If frame is complete and has a next-in-flow, we need to delete
// them now. Do not do this when a break-before is signaled because
// the frame is going to get reflowed again (and may end up wanting
// a next-in-flow where it ends up).
if (aReflowStatus.IsComplete()) {
if (nsIFrame* kidNextInFlow = aFrame->GetNextInFlow()) {
// Remove all of the childs next-in-flows. Make sure that we ask
// the right parent to do the removal (it's possible that the
// parent is not this because we are executing pullup code)
FrameDestroyContext context(aFrame->PresShell());
kidNextInFlow->GetParent()->DeleteNextInFlowChild(context,
kidNextInFlow, true);
}
}
// Check whether this frame breaks up text runs. All frames break up text
// runs (hence return false here) except for text frames and inline
// containers.
bool continuingTextRun = aFrame->CanContinueTextRun();
// Clear any residual mTrimmableISize if this isn't a text frame
if (!continuingTextRun && !pfd->mSkipWhenTrimmingWhitespace) {
mTrimmableISize = 0;
}
// See if we can place the frame. If we can't fit it, then we
// return now.
bool optionalBreakAfterFits;
NS_ASSERTION(isText || !reflowInputHolder->mStyleDisplay->IsFloating(
reflowInputHolder->mFrame),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
if (CanPlaceFrame(pfd, notSafeToBreak, continuingTextRun,
savedOptionalBreakFrame != nullptr, reflowOutput,
aReflowStatus, &optionalBreakAfterFits)) {
if (!isEmpty) {
psd->mHasNonemptyContent = true;
mLineIsEmpty = false;
if (!pfd->mSpan) {
// nonempty leaf content has been placed
mLineAtStart = false;
}
if (LayoutFrameType::Ruby == frameType) {
mHasRuby = true;
SyncAnnotationBounds(pfd);
}
}
// Place the frame, updating aBounds with the final size and
// location. Then apply the bottom+right margins (as
// appropriate) to the frame.
PlaceFrame(pfd, reflowOutput);
PerSpanData* span = pfd->mSpan;
if (span) {
// The frame we just finished reflowing is an inline
// container. It needs its child frames aligned in the block direction,
// so do most of it now.
VerticalAlignFrames(span);
}
if (!continuingTextRun && !psd->mNoWrap) {
if (!LineIsEmpty() || placedFloat) {
// record soft break opportunity after this content that can't be
// part of a text run. This is not a text frame so we know
// that offset INT32_MAX means "after the content".
if ((!aFrame->IsPlaceholderFrame() || LineIsEmpty()) &&
NotifyOptionalBreakPosition(aFrame, INT32_MAX,
optionalBreakAfterFits,
gfxBreakPriority::eNormalBreak)) {
// If this returns true then we are being told to actually break
// here.
aReflowStatus.SetInlineLineBreakAfter();
}
}
}
} else {
PushFrame(aFrame);
aPushedFrame = true;
// Undo any saved break positions that the frame might have told us about,
// since we didn't end up placing it
RestoreSavedBreakPosition(savedOptionalBreakFrame,
savedOptionalBreakOffset,
savedOptionalBreakPriority);
}
} else {
PushFrame(aFrame);
aPushedFrame = true;
}
#ifdef REALLY_NOISY_REFLOW
nsIFrame::IndentBy(stdout, mSpanDepth);
printf("End ReflowFrame ");
aFrame->ListTag(stdout);
printf(" status=%x\n", aReflowStatus);
#endif
}
void nsLineLayout::AllowForStartMargin(PerFrameData* pfd,
ReflowInput& aReflowInput) {
NS_ASSERTION(!aReflowInput.mStyleDisplay->IsFloating(aReflowInput.mFrame),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
WritingMode lineWM = mRootSpan->mWritingMode;
// Only apply start-margin on the first-in flow for inline frames,
// and make sure to not apply it to any inline other than the first
// in an ib split. Note that the ib sibling (block-in-inline
// sibling) annotations only live on the first continuation, but we
// don't want to apply the start margin for later continuations
// anyway. For box-decoration-break:clone we apply the start-margin
// on all continuations.
if ((pfd->mFrame->GetPrevContinuation() ||
pfd->mFrame->FrameIsNonFirstInIBSplit()) &&
aReflowInput.mStyleBorder->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Slice) {
// Zero this out so that when we compute the max-element-width of
// the frame we will properly avoid adding in the starting margin.
pfd->mMargin.IStart(lineWM) = 0;
} else if (NS_UNCONSTRAINEDSIZE == aReflowInput.ComputedISize()) {
NS_WARNING_ASSERTION(
NS_UNCONSTRAINEDSIZE != aReflowInput.AvailableISize(),
"have unconstrained inline-size; this should only result from very "
"large sizes, not attempts at intrinsic inline-size calculation");
// For inline-ish and text-ish things (which don't compute widths
// in the reflow input), adjust available inline-size to account
// for the start margin. The end margin will be accounted for when
// we finish flowing the frame.
WritingMode wm = aReflowInput.GetWritingMode();
aReflowInput.SetAvailableISize(
aReflowInput.AvailableISize() -
pfd->mMargin.ConvertTo(wm, lineWM).IStart(wm));
}
}
nscoord nsLineLayout::GetCurrentFrameInlineDistanceFromBlock() {
PerSpanData* psd;
nscoord x = 0;
for (psd = mCurrentSpan; psd; psd = psd->mParent) {
x += psd->mICoord;
}
return x;
}
/**
* This method syncs bounds of ruby annotations and ruby annotation
* containers from their rect. It is necessary because:
* Containers are not part of the line in their levels, which means
* their bounds are not set properly before.
* Ruby annotations' position may have been changed when reflowing
* their containers.
*/
void nsLineLayout::SyncAnnotationBounds(PerFrameData* aRubyFrame) {
MOZ_ASSERT(aRubyFrame->mFrame->IsRubyFrame());
MOZ_ASSERT(aRubyFrame->mSpan);
PerSpanData* span = aRubyFrame->mSpan;
WritingMode lineWM = mRootSpan->mWritingMode;
for (PerFrameData* pfd = span->mFirstFrame; pfd; pfd = pfd->mNext) {
for (PerFrameData* rtc = pfd->mNextAnnotation; rtc;
rtc = rtc->mNextAnnotation) {
if (lineWM.IsOrthogonalTo(rtc->mFrame->GetWritingMode())) {
// Inter-character case: don't attempt to sync annotation bounds.
continue;
}
// When the annotation container is reflowed, the width of the
// ruby container is unknown so we use a dummy container size;
// in the case of RTL block direction, the final position will be
// fixed up later.
const nsSize dummyContainerSize;
LogicalRect rtcBounds(lineWM, rtc->mFrame->GetRect(), dummyContainerSize);
rtc->mBounds = rtcBounds;
nsSize rtcSize = rtcBounds.Size(lineWM).GetPhysicalSize(lineWM);
for (PerFrameData* rt = rtc->mSpan->mFirstFrame; rt; rt = rt->mNext) {
LogicalRect rtBounds = rt->mFrame->GetLogicalRect(lineWM, rtcSize);
MOZ_ASSERT(rt->mBounds.Size(lineWM) == rtBounds.Size(lineWM),
"Size of the annotation should not have been changed");
rt->mBounds.SetOrigin(lineWM, rtBounds.Origin(lineWM));
}
}
}
}
/**
* See if the frame can be placed now that we know it's desired size.
* We can always place the frame if the line is empty. Note that we
* know that the reflow-status is not a break-before because if it was
* ReflowFrame above would have returned false, preventing this method
* from being called. The logic in this method assumes that.
*
* Note that there is no check against the Y coordinate because we
* assume that the caller will take care of that.
*/
bool nsLineLayout::CanPlaceFrame(PerFrameData* pfd, bool aNotSafeToBreak,
bool aFrameCanContinueTextRun,
bool aCanRollBackBeforeFrame,
ReflowOutput& aMetrics,
nsReflowStatus& aStatus,
bool* aOptionalBreakAfterFits) {
MOZ_ASSERT(pfd && pfd->mFrame, "bad args, null pointers for frame data");
*aOptionalBreakAfterFits = true;
WritingMode lineWM = mRootSpan->mWritingMode;
/*
* We want to only apply the end margin if we're the last continuation and
* either not in an {ib} split or the last inline in it. In all other
* cases we want to zero it out. That means zeroing it out if any of these
* conditions hold:
* 1) The frame is not complete (in this case it will get a next-in-flow)
* 2) The frame is complete but has a non-fluid continuation on its
* continuation chain. Note that if it has a fluid continuation, that
* continuation will get destroyed later, so we don't want to drop the
* end-margin in that case.
* 3) The frame is in an {ib} split and is not the last part.
*
* However, none of that applies if this is a letter frame (XXXbz why?)
*
* For box-decoration-break:clone we apply the end margin on all
* continuations (that are not letter frames).
*/
if ((aStatus.IsIncomplete() ||
pfd->mFrame->LastInFlow()->GetNextContinuation() ||
pfd->mFrame->FrameIsNonLastInIBSplit()) &&
!pfd->mIsLetterFrame &&
pfd->mFrame->StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Slice) {
pfd->mMargin.IEnd(lineWM) = 0;
}
// Apply the start margin to the frame bounds.
nscoord startMargin = pfd->mMargin.IStart(lineWM);
nscoord endMargin = pfd->mMargin.IEnd(lineWM);
pfd->mBounds.IStart(lineWM) += startMargin;
PerSpanData* psd = mCurrentSpan;
if (psd->mNoWrap) {
// When wrapping is off, everything fits.
return true;
}
#ifdef NOISY_CAN_PLACE_FRAME
if (psd->mFrame) {
psd->mFrame->mFrame->ListTag(stdout);
}
printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
pfd->mFrame->ListTag(stdout);
printf(" frameWidth=%d, margins=%d,%d\n",
pfd->mBounds.IEnd(lineWM) + endMargin - psd->mICoord, startMargin,
endMargin);
#endif
// Set outside to true if the result of the reflow leads to the
// frame sticking outside of our available area.
bool outside =
pfd->mBounds.IEnd(lineWM) - mTrimmableISize + endMargin > psd->mIEnd;
if (!outside) {
// If it fits, it fits
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> inside\n");
#endif
return true;
}
*aOptionalBreakAfterFits = false;
// When it doesn't fit, check for a few special conditions where we
// allow it to fit anyway.
if (0 == startMargin + pfd->mBounds.ISize(lineWM) + endMargin) {
// Empty frames always fit right where they are
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> empty frame fits\n");
#endif
return true;
}
// another special case: always place a BR
if (pfd->mFrame->IsBrFrame()) {
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> BR frame fits\n");
#endif
return true;
}
if (aNotSafeToBreak) {
// There are no frames on the line that take up width and the line is
// not impacted by floats, so we must allow the current frame to be
// placed on the line
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> not-safe and not-impacted fits: ");
while (nullptr != psd) {
printf("<psd=%p x=%d left=%d> ", psd, psd->mICoord, psd->mIStart);
psd = psd->mParent;
}
printf("\n");
#endif
return true;
}
// Special check for span frames
if (pfd->mSpan && pfd->mSpan->mContainsFloat) {
// If the span either directly or indirectly contains a float then
// it fits. Why? It's kind of complicated, but here goes:
//
// 1. CanPlaceFrame is used for all frame placements on a line,
// and in a span. This includes recursively placement of frames
// inside of spans, and the span itself. Because the logic always
// checks for room before proceeding (the code above here), the
// only things on a line will be those things that "fit".
//
// 2. Before a float is placed on a line, the line has to be empty
// (otherwise it's a "below current line" float and will be placed
// after the line).
//
// Therefore, if the span directly or indirectly has a float
// then it means that at the time of the placement of the float
// the line was empty. Because of #1, only the frames that fit can
// be added after that point, therefore we can assume that the
// current span being placed has fit.
//
// So how do we get here and have a span that should already fit
// and yet doesn't: Simple: span's that have the no-wrap attribute
// set on them and contain a float and are placed where they
// don't naturally fit.
return true;
}
if (aFrameCanContinueTextRun) {
// Let it fit, but we reserve the right to roll back.
// Note that we usually won't get here because a text frame will break
// itself to avoid exceeding the available width.
// We'll only get here for text frames that couldn't break early enough.
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> placing overflowing textrun, requesting backup\n");
#endif
// We will want to try backup.
mNeedBackup = true;
return true;
}
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> didn't fit\n");
#endif
aStatus.SetInlineLineBreakBeforeAndReset();
return false;
}
/**
* Place the frame. Update running counters.
*/
void nsLineLayout::PlaceFrame(PerFrameData* pfd, ReflowOutput& aMetrics) {
WritingMode lineWM = mRootSpan->mWritingMode;
// If the frame's block direction does not match the line's, we can't use
// its ascent; instead, treat it as a block with baseline at the block-end
// edge (or block-begin in the case of an "inverted" line).
if (pfd->mWritingMode.GetBlockDir() != lineWM.GetBlockDir()) {
pfd->mAscent = lineWM.IsAlphabeticalBaseline()
? lineWM.IsLineInverted() ? 0 : aMetrics.BSize(lineWM)
: aMetrics.BSize(lineWM) / 2;
} else {
// For inline reflow participants, baseline may get assigned as the frame is
// vertically aligned, which happens after this.
const auto baselineSource = pfd->mFrame->StyleDisplay()->mBaselineSource;
if (baselineSource == StyleBaselineSource::Auto ||
pfd->mFrame->IsLineParticipant()) {
if (aMetrics.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) {
pfd->mAscent = pfd->mFrame->GetLogicalBaseline(lineWM);
} else {
pfd->mAscent = aMetrics.BlockStartAscent();
}
} else {
const auto sourceGroup = [baselineSource]() {
switch (baselineSource) {
case StyleBaselineSource::First:
return BaselineSharingGroup::First;
case StyleBaselineSource::Last:
return BaselineSharingGroup::Last;
case StyleBaselineSource::Auto:
break;
}
MOZ_ASSERT_UNREACHABLE("Auto should be already handled?");
return BaselineSharingGroup::First;
}();
// We ignore line-layout specific layout quirks by setting
// `BaselineExportContext::Other`.
// Note(dshin): For a lot of frames, the export context does not make a
// difference, and we may be wasting the value cached in
// `BlockStartAscent`.
pfd->mAscent = pfd->mFrame->GetLogicalBaseline(
lineWM, sourceGroup, BaselineExportContext::Other);
}
}
// Advance to next inline coordinate
mCurrentSpan->mICoord = pfd->mBounds.IEnd(lineWM) + pfd->mMargin.IEnd(lineWM);
// Count the number of non-placeholder frames on the line...
if (pfd->mFrame->IsPlaceholderFrame()) {
NS_ASSERTION(
pfd->mBounds.ISize(lineWM) == 0 && pfd->mBounds.BSize(lineWM) == 0,
"placeholders should have 0 width/height (checking "
"placeholders were never counted by the old code in "
"this function)");
} else {
mTotalPlacedFrames++;
}
}
void nsLineLayout::AddMarkerFrame(nsIFrame* aFrame,
const ReflowOutput& aMetrics) {
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
NS_ASSERTION(mGotLineBox, "must have line box");
nsBlockFrame* blockFrame = do_QueryFrame(LineContainerFrame());
MOZ_ASSERT(blockFrame, "must be for block");
if (!blockFrame->MarkerIsEmpty()) {
mHasMarker = true;
mLineBox->SetHasMarker();
}
WritingMode lineWM = mRootSpan->mWritingMode;
PerFrameData* pfd = NewPerFrameData(aFrame);
PerSpanData* psd = mRootSpan;
MOZ_ASSERT(psd->mFirstFrame, "adding marker to an empty line?");
// Prepend the marker frame to the line.
psd->mFirstFrame->mPrev = pfd;
pfd->mNext = psd->mFirstFrame;
psd->mFirstFrame = pfd;
pfd->mIsMarker = true;
if (aMetrics.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) {
pfd->mAscent = aFrame->GetLogicalBaseline(lineWM);
} else {
pfd->mAscent = aMetrics.BlockStartAscent();
}
// Note: block-coord value will be updated during block-direction alignment
pfd->mBounds = LogicalRect(lineWM, aFrame->GetRect(), ContainerSize());
pfd->mOverflowAreas = aMetrics.mOverflowAreas;
}
void nsLineLayout::RemoveMarkerFrame(nsIFrame* aFrame) {
PerSpanData* psd = mCurrentSpan;
MOZ_ASSERT(psd == mRootSpan, "::marker on non-root span?");
MOZ_ASSERT(psd->mFirstFrame->mFrame == aFrame,
"::marker is not the first frame?");
PerFrameData* pfd = psd->mFirstFrame;
MOZ_ASSERT(pfd != psd->mLastFrame, "::marker is the only frame?");
pfd->mNext->mPrev = nullptr;
psd->mFirstFrame = pfd->mNext;
FreeFrame(pfd);
}
#ifdef DEBUG
void nsLineLayout::DumpPerSpanData(PerSpanData* psd, int32_t aIndent) {
nsIFrame::IndentBy(stdout, aIndent);
printf("%p: left=%d x=%d right=%d\n", static_cast<void*>(psd), psd->mIStart,
psd->mICoord, psd->mIEnd);
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
nsIFrame::IndentBy(stdout, aIndent + 1);
pfd->mFrame->ListTag(stdout);
nsRect rect =
pfd->mBounds.GetPhysicalRect(psd->mWritingMode, ContainerSize());
printf(" %d,%d,%d,%d\n", rect.x, rect.y, rect.width, rect.height);
if (pfd->mSpan) {
DumpPerSpanData(pfd->mSpan, aIndent + 1);
}
pfd = pfd->mNext;
}
}
#endif
void nsLineLayout::RecordNoWrapFloat(nsIFrame* aFloat) {
GetOutermostLineLayout()->mBlockRS->mNoWrapFloats.AppendElement(aFloat);
}
void nsLineLayout::FlushNoWrapFloats() {
auto& noWrapFloats = GetOutermostLineLayout()->mBlockRS->mNoWrapFloats;
for (nsIFrame* floatedFrame : noWrapFloats) {
TryToPlaceFloat(floatedFrame);
}
noWrapFloats.Clear();
}
bool nsLineLayout::TryToPlaceFloat(nsIFrame* aFloat) {
// Add mTrimmableISize to the available width since if the line ends here, the
// width of the inline content will be reduced by mTrimmableISize.
nscoord availableISize =
mCurrentSpan->mIEnd - (mCurrentSpan->mICoord - mTrimmableISize);
NS_ASSERTION(!(aFloat->IsLetterFrame() && GetFirstLetterStyleOK()),
"FirstLetterStyle set on line with floating first letter");
return GetOutermostLineLayout()->AddFloat(aFloat, availableISize);
}
bool nsLineLayout::NotifyOptionalBreakPosition(nsIFrame* aFrame,
int32_t aOffset, bool aFits,
gfxBreakPriority aPriority) {
NS_ASSERTION(!aFits || !mNeedBackup,
"Shouldn't be updating the break position with a break that fits"
" after we've already flagged an overrun");
MOZ_ASSERT(mCurrentSpan, "Should be doing line layout");
if (mCurrentSpan->mNoWrap) {
FlushNoWrapFloats();
}
// Remember the last break position that fits; if there was no break that fit,
// just remember the first break
if ((aFits && aPriority >= mLastOptionalBreakPriority) ||
!mLastOptionalBreakFrame) {
mLastOptionalBreakFrame = aFrame;
mLastOptionalBreakFrameOffset = aOffset;
mLastOptionalBreakPriority = aPriority;
}
return aFrame && mForceBreakFrame == aFrame &&
mForceBreakFrameOffset == aOffset;
}
#define VALIGN_OTHER 0
#define VALIGN_TOP 1
#define VALIGN_BOTTOM 2
void nsLineLayout::VerticalAlignLine() {
// Partially place the children of the block frame. The baseline for
// this operation is set to zero so that the y coordinates for all
// of the placed children will be relative to there.
PerSpanData* psd = mRootSpan;
VerticalAlignFrames(psd);
// *** Note that comments here still use the anachronistic term
// "line-height" when we really mean "size of the line in the block
// direction", "vertical-align" when we really mean "alignment in
// the block direction", and "top" and "bottom" when we really mean
// "block start" and "block end". This is partly for brevity and
// partly to retain the association with the CSS line-height and
// vertical-align properties.
//
// Compute the line-height. The line-height will be the larger of:
//
// [1] maxBCoord - minBCoord (the distance between the first child's
// block-start edge and the last child's block-end edge)
//
// [2] the maximum logical box block size (since not every frame may have
// participated in #1; for example: "top" and "botttom" aligned frames)
//
// [3] the minimum line height ("line-height" property set on the
// block frame)
nscoord lineBSize = psd->mMaxBCoord - psd->mMinBCoord;
// Now that the line-height is computed, we need to know where the
// baseline is in the line. Position baseline so that mMinBCoord is just
// inside the start of the line box.
nscoord baselineBCoord;
if (psd->mMinBCoord < 0) {
baselineBCoord = mBStartEdge - psd->mMinBCoord;
} else {
baselineBCoord = mBStartEdge;
}
// It's also possible that the line block-size isn't tall enough because
// of "top" and "bottom" aligned elements that were not accounted for in
// min/max BCoord.
//
// The CSS2 spec doesn't really say what happens when to the
// baseline in this situations. What we do is if the largest start
// aligned box block size is greater than the line block-size then we leave
// the baseline alone. If the largest end aligned box is greater
// than the line block-size then we slide the baseline forward by the extra
// amount.
//
// Navigator 4 gives precedence to the first top/bottom aligned
// object. We just let block end aligned objects win.
if (lineBSize < mMaxEndBoxBSize) {
// When the line is shorter than the maximum block start aligned box
nscoord extra = mMaxEndBoxBSize - lineBSize;
baselineBCoord += extra;
lineBSize = mMaxEndBoxBSize;
}
if (lineBSize < mMaxStartBoxBSize) {
lineBSize = mMaxStartBoxBSize;
}
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [line]==> lineBSize=%d baselineBCoord=%d\n", lineBSize,
baselineBCoord);
#endif
// Now position all of the frames in the root span. We will also
// recurse over the child spans and place any frames we find with
// vertical-align: top or bottom.
// XXX PERFORMANCE: set a bit per-span to avoid the extra work
// (propagate it upward too)
WritingMode lineWM = psd->mWritingMode;
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (pfd->mBlockDirAlign == VALIGN_OTHER) {
pfd->mBounds.BStart(lineWM) += baselineBCoord;
pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSize());
}
}
PlaceTopBottomFrames(psd, -mBStartEdge, lineBSize);
mFinalLineBSize = lineBSize;
if (mGotLineBox) {
// Fill in returned line-box and max-element-width data
mLineBox->SetBounds(lineWM, psd->mIStart, mBStartEdge,
psd->mICoord - psd->mIStart, lineBSize,
ContainerSize());
mLineBox->SetLogicalAscent(baselineBCoord - mBStartEdge);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n",
mLineBox->GetBounds().IStart(lineWM),
mLineBox->GetBounds().BStart(lineWM),
mLineBox->GetBounds().ISize(lineWM),
mLineBox->GetBounds().BSize(lineWM), mFinalLineBSize,
mLineBox->GetLogicalAscent());
#endif
}
}
// Place frames with CSS property vertical-align: top or bottom.
void nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd,
nscoord aDistanceFromStart,
nscoord aLineBSize) {
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
NS_ASSERTION(0xFF != pfd->mBlockDirAlign, "umr");
#endif
WritingMode lineWM = mRootSpan->mWritingMode;
nsSize containerSize = ContainerSizeForSpan(psd);
switch (pfd->mBlockDirAlign) {
case VALIGN_TOP:
if (span) {
pfd->mBounds.BStart(lineWM) = -aDistanceFromStart - span->mMinBCoord;
} else {
pfd->mBounds.BStart(lineWM) =
-aDistanceFromStart + pfd->mMargin.BStart(lineWM);
}
pfd->mFrame->SetRect(lineWM, pfd->mBounds, containerSize);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" ");
pfd->mFrame->ListTag(stdout);
printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
pfd->mBounds.BStart(lineWM), aDistanceFromStart,
span ? pfd->mBorderPadding.BStart(lineWM) : 0,
span ? span->mBStartLeading : 0);
#endif
break;
case VALIGN_BOTTOM:
if (span) {
// Compute bottom leading
pfd->mBounds.BStart(lineWM) =
-aDistanceFromStart + aLineBSize - span->mMaxBCoord;
} else {
pfd->mBounds.BStart(lineWM) = -aDistanceFromStart + aLineBSize -
pfd->mMargin.BEnd(lineWM) -
pfd->mBounds.BSize(lineWM);
}
pfd->mFrame->SetRect(lineWM, pfd->mBounds, containerSize);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" ");
pfd->mFrame->ListTag(stdout);
printf(": y=%d\n", pfd->mBounds.BStart(lineWM));
#endif
break;
}
if (span) {
nscoord fromStart = aDistanceFromStart + pfd->mBounds.BStart(lineWM);
PlaceTopBottomFrames(span, fromStart, aLineBSize);
}
}
}
static nscoord GetBSizeOfEmphasisMarks(nsIFrame* aSpanFrame, float aInflation) {
RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetFontMetricsOfEmphasisMarks(
aSpanFrame->Style(), aSpanFrame->PresContext(), aInflation);
return fm->MaxHeight();
}
void nsLineLayout::AdjustLeadings(nsIFrame* spanFrame, PerSpanData* psd,
const nsStyleText* aStyleText,
float aInflation,
bool* aZeroEffectiveSpanBox) {
MOZ_ASSERT(spanFrame == psd->mFrame->mFrame);
nscoord requiredStartLeading = 0;
nscoord requiredEndLeading = 0;
if (spanFrame->IsRubyFrame()) {
// We may need to extend leadings here for ruby annotations as
// required by section Line Spacing in the CSS Ruby spec.
auto rubyFrame = static_cast<nsRubyFrame*>(spanFrame);
RubyBlockLeadings leadings = rubyFrame->GetBlockLeadings();
requiredStartLeading += leadings.mStart;
requiredEndLeading += leadings.mEnd;
}
if (aStyleText->HasEffectiveTextEmphasis()) {
nscoord bsize = GetBSizeOfEmphasisMarks(spanFrame, aInflation);
LogicalSide side = aStyleText->TextEmphasisSide(mRootSpan->mWritingMode);
if (side == LogicalSide::BStart) {
requiredStartLeading += bsize;
} else {
MOZ_ASSERT(side == LogicalSide::BEnd,
"emphasis marks must be in block axis");
requiredEndLeading += bsize;
}
}
nscoord requiredLeading = requiredStartLeading + requiredEndLeading;
// If we do not require any additional leadings, don't touch anything
// here even if it is greater than the original leading, because the
// latter could be negative.
if (requiredLeading != 0) {
nscoord leading = psd->mBStartLeading + psd->mBEndLeading;
nscoord deltaLeading = requiredLeading - leading;
if (deltaLeading > 0) {
// If the total leading is not wide enough for ruby annotations
// and/or emphasis marks, extend the side which is not enough. If
// both sides are not wide enough, replace the leadings with the
// requested values.
if (requiredStartLeading < psd->mBStartLeading) {
psd->mBEndLeading += deltaLeading;
} else if (requiredEndLeading < psd->mBEndLeading) {
psd->mBStartLeading += deltaLeading;
} else {
psd->mBStartLeading = requiredStartLeading;
psd->mBEndLeading = requiredEndLeading;
}
psd->mLogicalBSize += deltaLeading;
// We have adjusted the leadings, it is no longer a zero
// effective span box.
*aZeroEffectiveSpanBox = false;
}
}
}
static float GetInflationForBlockDirAlignment(nsIFrame* aFrame,
nscoord aInflationMinFontSize) {
if (aFrame->IsInSVGTextSubtree()) {
const nsIFrame* container =
nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::SVGText);
NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
return static_cast<const SVGTextFrame*>(container)
->GetFontSizeScaleFactor();
}
return nsLayoutUtils::FontSizeInflationInner(aFrame, aInflationMinFontSize);
}
bool nsLineLayout::ShouldApplyLineHeightInPreserveWhiteSpace(
const PerSpanData* psd) {
if (psd->mFrame->mFrame->Style()->IsAnonBox()) {
// e.g. An empty `input[type=button]` should still be line-height sized.
return true;
}
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (!pfd->mIsEmpty) {
return true;
}
}
return false;
}
#define BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM nscoord_MAX
#define BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM nscoord_MIN
// Place frames in the block direction within a given span (CSS property
// vertical-align) Note: this doesn't place frames with vertical-align:
// top or bottom as those have to wait until the entire line box block
// size is known. This is called after the span frame has finished being
// reflowed so that we know its block size.
void nsLineLayout::VerticalAlignFrames(PerSpanData* psd) {
// Get parent frame info
PerFrameData* spanFramePFD = psd->mFrame;
nsIFrame* spanFrame = spanFramePFD->mFrame;
// Get the parent frame's font for all of the frames in this span
float inflation =
GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize);
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetFontMetricsForFrame(spanFrame, inflation);
bool preMode = mStyleText->WhiteSpaceIsSignificant();
// See if the span is an empty continuation. It's an empty continuation iff:
// - it has a prev-in-flow
// - it has no next in flow
// - it's zero sized
WritingMode lineWM = mRootSpan->mWritingMode;
bool emptyContinuation = psd != mRootSpan && spanFrame->GetPrevInFlow() &&
!spanFrame->GetNextInFlow() &&
spanFramePFD->mBounds.IsZeroSize();
#ifdef NOISY_BLOCKDIR_ALIGN
printf("[%sSpan]", (psd == mRootSpan) ? "Root" : "");
spanFrame->ListTag(stdout);
printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s",
preMode ? "yes" : "no",
mPresContext->CompatibilityMode() != eCompatibility_NavQuirks ? "yes"
: "no",
spanFramePFD->mBounds.ISize(lineWM),
spanFramePFD->mBounds.BSize(lineWM), emptyContinuation ? "yes" : "no");
if (psd != mRootSpan) {
printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
spanFramePFD->mBorderPadding.Top(lineWM),
spanFramePFD->mBorderPadding.Right(lineWM),
spanFramePFD->mBorderPadding.Bottom(lineWM),
spanFramePFD->mBorderPadding.Left(lineWM),
spanFramePFD->mMargin.Top(lineWM),
spanFramePFD->mMargin.Right(lineWM),
spanFramePFD->mMargin.Bottom(lineWM),
spanFramePFD->mMargin.Left(lineWM));
}
printf("\n");
#endif
// Compute the span's zeroEffectiveSpanBox flag. What we are trying
// to determine is how we should treat the span: should it act
// "normally" according to css2 or should it effectively
// "disappear".
//
// In general, if the document being processed is in full standards
// mode then it should act normally (with one exception). The
// exception case is when a span is continued and yet the span is
// empty (e.g. compressed whitespace). For this kind of span we treat
// it as if it were not there so that it doesn't impact the
// line block-size.
//
// In almost standards mode or quirks mode, we should sometimes make
// it disappear. The cases that matter are those where the span
// contains no real text elements that would provide an ascent and
// descent and height. However, if css style elements have been
// applied to the span (border/padding/margin) so that it's clear the
// document author is intending css2 behavior then we act as if strict
// mode is set.
//
// This code works correctly for preMode, because a blank line
// in PRE mode is encoded as a text node with a LF in it, since
// text nodes with only whitespace are considered in preMode.
//
// Much of this logic is shared with the various implementations of
// nsIFrame::IsEmpty since they need to duplicate the way it makes
// some lines empty. However, nsIFrame::IsEmpty can't be reused here
// since this code sets zeroEffectiveSpanBox even when there are
// non-empty children.
bool zeroEffectiveSpanBox = false;
// XXXldb If we really have empty continuations, then all these other
// checks don't make sense for them.
// XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that
// it agrees with this code. (If it doesn't agree, it probably should.)
if ((emptyContinuation ||
mPresContext->CompatibilityMode() != eCompatibility_FullStandards) &&
((psd == mRootSpan) || (spanFramePFD->mBorderPadding.IsAllZero() &&
spanFramePFD->mMargin.IsAllZero()))) {
// This code handles an issue with compatibility with non-css
// conformant browsers. In particular, there are some cases
// where the font-size and line-height for a span must be
// ignored and instead the span must *act* as if it were zero
// sized. In general, if the span contains any non-compressed
// text then we don't use this logic.
// However, this is not propagated outwards, since (in compatibility
// mode) we don't want big line heights for things like
// <p><font size="-1">Text</font></p>
// We shouldn't include any whitespace that collapses, unless we're
// preformatted (in which case it shouldn't, but the width=0 test is
// perhaps incorrect). This includes whitespace at the beginning of
// a line and whitespace preceded (?) by other whitespace.
zeroEffectiveSpanBox = true;
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (pfd->mIsTextFrame &&
(pfd->mIsNonWhitespaceTextFrame || preMode ||
pfd->mBounds.ISize(mRootSpan->mWritingMode) != 0)) {
zeroEffectiveSpanBox = false;
break;
}
}
}
// Setup baselineBCoord, minBCoord, and maxBCoord
nscoord baselineBCoord, minBCoord, maxBCoord;
if (psd == mRootSpan) {
// Use a zero baselineBCoord since we don't yet know where the baseline
// will be (until we know how tall the line is; then we will
// know). In addition, use extreme values for the minBCoord and maxBCoord
// values so that only the child frames will impact their values
// (since these are children of the block, there is no span box to
// provide initial values).
baselineBCoord = 0;
minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
#ifdef NOISY_BLOCKDIR_ALIGN
printf("[RootSpan]");
spanFrame->ListTag(stdout);
printf(
": pass1 valign frames: topEdge=%d minLineBSize=%d "
"zeroEffectiveSpanBox=%s\n",
mBStartEdge, mMinLineBSize, zeroEffectiveSpanBox ? "yes" : "no");
#endif
} else {
// Compute the logical block size for this span. The logical block size
// is based on the "line-height" value, not the font-size. Also
// compute the top leading.
float inflation =
GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize);
nscoord logicalBSize = ReflowInput::CalcLineHeight(
*spanFrame->Style(), spanFrame->PresContext(), spanFrame->GetContent(),
mLineContainerRI.ComputedHeight(), inflation);
nscoord contentBSize = spanFramePFD->mBounds.BSize(lineWM) -
spanFramePFD->mBorderPadding.BStartEnd(lineWM);
// Special-case for a ::first-letter frame, set the line height to
// the frame block size if the user has left line-height == normal
if (spanFramePFD->mIsLetterFrame && !spanFrame->GetPrevInFlow() &&
spanFrame->StyleFont()->mLineHeight.IsNormal()) {
logicalBSize = spanFramePFD->mBounds.BSize(lineWM);
}
nscoord leading = logicalBSize - contentBSize;
psd->mBStartLeading = leading / 2;
psd->mBEndLeading = leading - psd->mBStartLeading;
psd->mLogicalBSize = logicalBSize;
AdjustLeadings(spanFrame, psd, spanFrame->StyleText(), inflation,
&zeroEffectiveSpanBox);
if (zeroEffectiveSpanBox) {
// When the span-box is to be ignored, zero out the initial
// values so that the span doesn't impact the final line
// height. The contents of the span can impact the final line
// height.
// Note that things are readjusted for this span after its children
// are reflowed
minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
} else {
// The initial values for the min and max block coord values are in the
// span's coordinate space, and cover the logical block size of the span.
// If there are child frames in this span that stick out of this area
// then the minBCoord and maxBCoord are updated by the amount of logical
// blockSize that is outside this range.
minBCoord =
spanFramePFD->mBorderPadding.BStart(lineWM) - psd->mBStartLeading;
maxBCoord = minBCoord + psd->mLogicalBSize;
}
// This is the distance from the top edge of the parents visual
// box to the baseline. The span already computed this for us,
// so just use it.
*psd->mBaseline = baselineBCoord = spanFramePFD->mAscent;
#ifdef NOISY_BLOCKDIR_ALIGN
printf("[%sSpan]", (psd == mRootSpan) ? "Root" : "");
spanFrame->ListTag(stdout);
printf(
": baseLine=%d logicalBSize=%d topLeading=%d h=%d bp=%d,%d "
"zeroEffectiveSpanBox=%s\n",
baselineBCoord, psd->mLogicalBSize, psd->mBStartLeading,
spanFramePFD->mBounds.BSize(lineWM),
spanFramePFD->mBorderPadding.Top(lineWM),
spanFramePFD->mBorderPadding.Bottom(lineWM),
zeroEffectiveSpanBox ? "yes" : "no");
#endif
}
nscoord maxStartBoxBSize = 0;
nscoord maxEndBoxBSize = 0;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
nsIFrame* frame = pfd->mFrame;
NS_ASSERTION(frame,
"null frame in PerFrameData - something is very very bad");
if (!frame) {
return;
}
// Compute the logical block size of the frame
nscoord logicalBSize;
PerSpanData* frameSpan = pfd->mSpan;
if (frameSpan) {
// For span frames the logical-block-size and start-leading were
// pre-computed when the span was reflowed.
logicalBSize = frameSpan->mLogicalBSize;
} else {
// For other elements the logical block size is the same as the
// frame's block size plus its margins.
logicalBSize =
pfd->mBounds.BSize(lineWM) + pfd->mMargin.BStartEnd(lineWM);
if (logicalBSize < 0 &&
mPresContext->CompatibilityMode() != eCompatibility_FullStandards) {
pfd->mAscent -= logicalBSize;
logicalBSize = 0;
}
}
// Get vertical-align property ("vertical-align" is the CSS name for
// block-direction align)
const auto& verticalAlign = frame->StyleDisplay()->mVerticalAlign;
Maybe<StyleVerticalAlignKeyword> verticalAlignEnum =
frame->VerticalAlignEnum();
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [frame]");
frame->ListTag(stdout);
printf(": verticalAlignIsKw=%d (enum == %d", verticalAlign.IsKeyword(),
verticalAlign.IsKeyword()
? static_cast<int>(verticalAlign.AsKeyword())
: -1);
if (verticalAlignEnum) {
printf(", after SVG dominant-baseline conversion == %d",
static_cast<int>(*verticalAlignEnum));
}
printf(")\n");
#endif
if (verticalAlignEnum) {
StyleVerticalAlignKeyword keyword = *verticalAlignEnum;
if (lineWM.IsVertical()) {
if (keyword == StyleVerticalAlignKeyword::Middle) {
// For vertical writing mode where the dominant baseline is centered
// (i.e. text-orientation is not sideways-*), we remap 'middle' to
// 'middle-with-baseline' so that images align sensibly with the
// center-baseline-aligned text.
if (!lineWM.IsSideways()) {
keyword = StyleVerticalAlignKeyword::MozMiddleWithBaseline;
}
} else if (lineWM.IsLineInverted()) {
// Swap the meanings of top and bottom when line is inverted
// relative to block direction.
switch (keyword) {
case StyleVerticalAlignKeyword::Top:
keyword = StyleVerticalAlignKeyword::Bottom;
break;
case StyleVerticalAlignKeyword::Bottom:
keyword = StyleVerticalAlignKeyword::Top;
break;
case StyleVerticalAlignKeyword::TextTop:
keyword = StyleVerticalAlignKeyword::TextBottom;
break;
case StyleVerticalAlignKeyword::TextBottom:
keyword = StyleVerticalAlignKeyword::TextTop;
break;
default:
break;
}
}
}
// baseline coord that may be adjusted for script offset
nscoord revisedBaselineBCoord = baselineBCoord;
// For superscript and subscript, raise or lower the baseline of the box
// to the proper offset of the parent's box, then proceed as for BASELINE
if (keyword == StyleVerticalAlignKeyword::Sub ||
keyword == StyleVerticalAlignKeyword::Super) {
revisedBaselineBCoord += lineWM.FlowRelativeToLineRelativeFactor() *
(keyword == StyleVerticalAlignKeyword::Sub
? fm->SubscriptOffset()
: -fm->SuperscriptOffset());
keyword = StyleVerticalAlignKeyword::Baseline;
}
switch (keyword) {
default:
case StyleVerticalAlignKeyword::Baseline:
pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
case StyleVerticalAlignKeyword::Top: {
pfd->mBlockDirAlign = VALIGN_TOP;
nscoord subtreeBSize = logicalBSize;
if (frameSpan) {
subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord;
NS_ASSERTION(subtreeBSize >= logicalBSize,
"unexpected subtree block size");
}
if (subtreeBSize > maxStartBoxBSize) {
maxStartBoxBSize = subtreeBSize;
}
break;
}
case StyleVerticalAlignKeyword::Bottom: {
pfd->mBlockDirAlign = VALIGN_BOTTOM;
nscoord subtreeBSize = logicalBSize;
if (frameSpan) {
subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord;
NS_ASSERTION(subtreeBSize >= logicalBSize,
"unexpected subtree block size");
}
if (subtreeBSize > maxEndBoxBSize) {
maxEndBoxBSize = subtreeBSize;
}
break;
}
case StyleVerticalAlignKeyword::Middle: {
// Align the midpoint of the frame with 1/2 the parents
// x-height above the baseline.
nscoord parentXHeight =
lineWM.FlowRelativeToLineRelativeFactor() * fm->XHeight();
if (frameSpan) {
pfd->mBounds.BStart(lineWM) =
baselineBCoord -
(parentXHeight + pfd->mBounds.BSize(lineWM)) / 2;
} else {
pfd->mBounds.BStart(lineWM) = baselineBCoord -
(parentXHeight + logicalBSize) / 2 +
pfd->mMargin.BStart(lineWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case StyleVerticalAlignKeyword::TextTop: {
// The top of the logical box is aligned with the top of
// the parent element's text.
// XXX For vertical text we will need a new API to get the logical
// max-ascent here
nscoord parentAscent =
lineWM.IsLineInverted() ? fm->MaxDescent() : fm->MaxAscent();
if (frameSpan) {
pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent -
pfd->mBorderPadding.BStart(lineWM) +
frameSpan->mBStartLeading;
} else {
pfd->mBounds.BStart(lineWM) =
baselineBCoord - parentAscent + pfd->mMargin.BStart(lineWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case StyleVerticalAlignKeyword::TextBottom: {
// The bottom of the logical box is aligned with the
// bottom of the parent elements text.
nscoord parentDescent =
lineWM.IsLineInverted() ? fm->MaxAscent() : fm->MaxDescent();
if (frameSpan) {
pfd->mBounds.BStart(lineWM) =
baselineBCoord + parentDescent - pfd->mBounds.BSize(lineWM) +
pfd->mBorderPadding.BEnd(lineWM) - frameSpan->mBEndLeading;
} else {
pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent -
pfd->mBounds.BSize(lineWM) -
pfd->mMargin.BEnd(lineWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case StyleVerticalAlignKeyword::MozMiddleWithBaseline: {
// Align the midpoint of the frame with the baseline of the parent.
if (frameSpan) {
pfd->mBounds.BStart(lineWM) =
baselineBCoord - pfd->mBounds.BSize(lineWM) / 2;
} else {
pfd->mBounds.BStart(lineWM) =
baselineBCoord - logicalBSize / 2 + pfd->mMargin.BStart(lineWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
}
} else {
// We have either a coord, a percent, or a calc().
nscoord offset = verticalAlign.AsLength().Resolve([&] {
// Percentages are like lengths, except treated as a percentage
// of the elements line block size value.
float inflation =
GetInflationForBlockDirAlignment(frame, mInflationMinFontSize);
return ReflowInput::CalcLineHeight(
*frame->Style(), frame->PresContext(), frame->GetContent(),
mLineContainerRI.ComputedBSize(), inflation);
});
// According to the CSS2 spec (10.8.1), a positive value
// "raises" the box by the given distance while a negative value
// "lowers" the box by the given distance (with zero being the
// baseline). Since Y coordinates increase towards the bottom of
// the screen we reverse the sign, unless the line orientation is
// inverted relative to block direction.
nscoord revisedBaselineBCoord =
baselineBCoord - offset * lineWM.FlowRelativeToLineRelativeFactor();
if (lineWM.IsCentralBaseline()) {
// If we're using a dominant center baseline, we align with the center
pfd->mBounds.BStart(lineWM) =
revisedBaselineBCoord - pfd->mBounds.BSize(lineWM) / 2;
} else {
pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
}
pfd->mBlockDirAlign = VALIGN_OTHER;
}
// Update minBCoord/maxBCoord for frames that we just placed. Do not factor
// text into the equation.
if (pfd->mBlockDirAlign == VALIGN_OTHER) {
// Text frames do not contribute to the min/max Y values for the
// line (instead their parent frame's font-size contributes).
// XXXrbs -- relax this restriction because it causes text frames
// to jam together when 'font-size-adjust' is enabled
// -- Note #1: With this code enabled and with the fact that we are
// not using Em[Ascent|Descent] as nsDimensions for text
// hold.
// -- Note #2: We still don't want empty-text frames to interfere.
// For example in quirks mode, avoiding empty text frames
// prevents "tall" lines around elements like <hr> since the
// rules of <hr> in quirks.css have pseudo text contents with LF
// in them.
bool canUpdate;
if (pfd->mIsTextFrame) {
// Only consider text frames if they're not empty and
// line-height=normal.
canUpdate = pfd->mIsNonWhitespaceTextFrame &&
frame->StyleFont()->mLineHeight.IsNormal();
} else {
canUpdate = !pfd->mIsPlaceholder;
}
if (canUpdate) {
nscoord blockStart, blockEnd;
if (frameSpan) {
// For spans that were are now placing, use their position
// plus their already computed min-Y and max-Y values for
// computing blockStart and blockEnd.
blockStart = pfd->mBounds.BStart(lineWM) + frameSpan->mMinBCoord;
blockEnd = pfd->mBounds.BStart(lineWM) + frameSpan->mMaxBCoord;
} else {
blockStart =
pfd->mBounds.BStart(lineWM) - pfd->mMargin.BStart(lineWM);
blockEnd = blockStart + logicalBSize;
}
if (!preMode &&
mPresContext->CompatibilityMode() != eCompatibility_FullStandards &&
!logicalBSize) {
// Check if it's a BR frame that is not alone on its line (it
// is given a block size of zero to indicate this), and if so reset
// blockStart and blockEnd so that BR frames don't influence the line.
if (frame->IsBrFrame()) {
blockStart = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
blockEnd = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
}
}
if (blockStart < minBCoord) minBCoord = blockStart;
if (blockEnd > maxBCoord) maxBCoord = blockEnd;
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" [frame]raw: a=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d "
"minBCoord=%d maxBCoord=%d\n",
pfd->mAscent, pfd->mBounds.BSize(lineWM),
pfd->mBorderPadding.Top(lineWM), pfd->mBorderPadding.Bottom(lineWM),
logicalBSize, frameSpan ? frameSpan->mBStartLeading : 0,
pfd->mBounds.BStart(lineWM), minBCoord, maxBCoord);
#endif
}
if (psd != mRootSpan) {
frame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
}
}
pfd = pfd->mNext;
}
// Factor in the minimum line block-size when handling the root-span for
// the block.
if (psd == mRootSpan) {
// We should factor in the block element's minimum line-height (as
// defined in section 10.8.1 of the css2 spec) assuming that
// zeroEffectiveSpanBox is not set on the root span. This only happens
// in some cases in quirks mode:
// (1) if the root span contains non-whitespace text directly (this
// is handled by zeroEffectiveSpanBox
// (2) if this line has a ::marker
// (3) if this is the last line of an LI, DT, or DD element
// (The last line before a block also counts, but not before a
// BR) (NN4/IE5 quirk)
// (1) and (2) above
bool applyMinLH = !zeroEffectiveSpanBox || mHasMarker;
bool isLastLine =
!mGotLineBox || (!mLineBox->IsLineWrapped() && !mLineEndsInBR);
if (!applyMinLH && isLastLine) {
nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
if (blockContent) {
// (3) above, if the last line of LI, DT, or DD
if (blockContent->IsAnyOfHTMLElements(nsGkAtoms::li, nsGkAtoms::dt,
nsGkAtoms::dd)) {
applyMinLH = true;
}
}
}
if (applyMinLH) {
if (psd->mHasNonemptyContent ||
(preMode && ShouldApplyLineHeightInPreserveWhiteSpace(psd)) ||
mHasMarker) {
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [span]==> adjusting min/maxBCoord: currentValues: %d,%d",
minBCoord, maxBCoord);
#endif
nscoord minimumLineBSize = mMinLineBSize;
nscoord blockStart = -nsLayoutUtils::GetCenteredFontBaseline(
fm, minimumLineBSize, lineWM.IsLineInverted());
nscoord blockEnd = blockStart + minimumLineBSize;
if (mStyleText->HasEffectiveTextEmphasis()) {
nscoord fontMaxHeight = fm->MaxHeight();
nscoord emphasisHeight =
GetBSizeOfEmphasisMarks(spanFrame, inflation);
nscoord delta = fontMaxHeight + emphasisHeight - minimumLineBSize;
if (delta > 0) {
if (minimumLineBSize < fontMaxHeight) {
// If the leadings are negative, fill them first.
nscoord ascent = fm->MaxAscent();
nscoord descent = fm->MaxDescent();
if (lineWM.IsLineInverted()) {
std::swap(ascent, descent);
}
blockStart = -ascent;
blockEnd = descent;
delta = emphasisHeight;
}
LogicalSide side = mStyleText->TextEmphasisSide(lineWM);
if (side == LogicalSide::BStart) {
blockStart -= delta;
} else {
blockEnd += delta;
}
}
}
if (blockStart < minBCoord) minBCoord = blockStart;
if (blockEnd > maxBCoord) maxBCoord = blockEnd;
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" new values: %d,%d\n", minBCoord, maxBCoord);
#endif
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" Used mMinLineBSize: %d, blockStart: %d, blockEnd: "
"%d\n",
mMinLineBSize, blockStart, blockEnd);
#endif
} else {
// XXX issues:
// [1] BR's on empty lines stop working
// [2] May not honor css2's notion of handling empty elements
// [3] blank lines in a pre-section ("\n") (handled with preMode)
// XXX Are there other problems with this?
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" [span]==> zapping min/maxBCoord: currentValues: %d,%d "
"newValues: 0,0\n",
minBCoord, maxBCoord);
#endif
minBCoord = maxBCoord = 0;
}
}
}
if ((minBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM) ||
(maxBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM)) {
minBCoord = maxBCoord = baselineBCoord;
}
if (psd != mRootSpan && zeroEffectiveSpanBox) {
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [span]adjusting for zeroEffectiveSpanBox\n");
printf(
" Original: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, "
"logicalBSize=%d, topLeading=%d, bottomLeading=%d\n",
minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(lineWM),
spanFramePFD->mAscent, psd->mLogicalBSize, psd->mBStartLeading,
psd->mBEndLeading);
#endif
nscoord goodMinBCoord =
spanFramePFD->mBorderPadding.BStart(lineWM) - psd->mBStartLeading;
nscoord goodMaxBCoord = goodMinBCoord + psd->mLogicalBSize;
// or making nsLineLayout::IsZeroBSize() handle
// vertical-align:top/bottom on a descendant of the line that's not
// a child of it), we want to treat elements that are
// vertical-align: top or bottom somewhat like children for the
// purposes of this quirk. To some extent, this is guessing, since
// they might end up being aligned anywhere. However, we'll guess
// that they'll be placed aligned with the top or bottom of this
// frame (as though this frame is the only thing in the line).
// (Guessing isn't unreasonable, since all we're doing is reducing the
// scope of a quirk and making the behavior more standards-like.)
if (maxStartBoxBSize > maxBCoord - minBCoord) {
// Distribute maxStartBoxBSize to ascent (baselineBCoord - minBCoord), and
// then to descent (maxBCoord - baselineBCoord) by adjusting minBCoord or
// maxBCoord, but not to exceed goodMinBCoord and goodMaxBCoord.
nscoord distribute = maxStartBoxBSize - (maxBCoord - minBCoord);
nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0);
if (distribute > ascentSpace) {
distribute -= ascentSpace;
minBCoord -= ascentSpace;
nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0);
if (distribute > descentSpace) {
maxBCoord += descentSpace;
} else {
maxBCoord += distribute;
}
} else {
minBCoord -= distribute;
}
}
if (maxEndBoxBSize > maxBCoord - minBCoord) {
// Likewise, but preferring descent to ascent.
nscoord distribute = maxEndBoxBSize - (maxBCoord - minBCoord);
nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0);
if (distribute > descentSpace) {
distribute -= descentSpace;
maxBCoord += descentSpace;
nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0);
if (distribute > ascentSpace) {
minBCoord -= ascentSpace;
} else {
minBCoord -= distribute;
}
} else {
maxBCoord += distribute;
}
}
if (minBCoord > goodMinBCoord) {
nscoord adjust = minBCoord - goodMinBCoord; // positive
// shrink the logical extents
psd->mLogicalBSize -= adjust;
psd->mBStartLeading -= adjust;
}
if (maxBCoord < goodMaxBCoord) {
nscoord adjust = goodMaxBCoord - maxBCoord;
psd->mLogicalBSize -= adjust;
psd->mBEndLeading -= adjust;
}
if (minBCoord > 0) {
// shrink the content by moving its block start down. This is tricky,
// since the block start is the 0 for many coordinates, so what we do is
// move everything else up.
spanFramePFD->mAscent -= minBCoord; // move the baseline up
spanFramePFD->mBounds.BSize(lineWM) -=
minBCoord; // move the block end up
psd->mBStartLeading += minBCoord;
*psd->mBaseline -= minBCoord;
pfd = psd->mFirstFrame;
while (nullptr != pfd) {
pfd->mBounds.BStart(lineWM) -= minBCoord; // move all the children
// back up
pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
pfd = pfd->mNext;
}
maxBCoord -= minBCoord; // since minBCoord is in the frame's own
// coordinate system
minBCoord = 0;
}
if (maxBCoord < spanFramePFD->mBounds.BSize(lineWM)) {
nscoord adjust = spanFramePFD->mBounds.BSize(lineWM) - maxBCoord;
spanFramePFD->mBounds.BSize(lineWM) -= adjust; // move the bottom up
psd->mBEndLeading += adjust;
}
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" New: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, "
"logicalBSize=%d, topLeading=%d, bottomLeading=%d\n",
minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(lineWM),
spanFramePFD->mAscent, psd->mLogicalBSize, psd->mBStartLeading,
psd->mBEndLeading);
#endif
}
psd->mMinBCoord = minBCoord;
psd->mMaxBCoord = maxBCoord;
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" [span]==> minBCoord=%d maxBCoord=%d delta=%d maxStartBoxBSize=%d "
"maxEndBoxBSize=%d\n",
minBCoord, maxBCoord, maxBCoord - minBCoord, maxStartBoxBSize,
maxEndBoxBSize);
#endif
if (maxStartBoxBSize > mMaxStartBoxBSize) {
mMaxStartBoxBSize = maxStartBoxBSize;
}
if (maxEndBoxBSize > mMaxEndBoxBSize) {
mMaxEndBoxBSize = maxEndBoxBSize;
}
}
static void SlideSpanFrameRect(nsIFrame* aFrame, nscoord aDeltaWidth) {
// This should not use nsIFrame::MovePositionBy because it happens
// prior to relative positioning. In particular, because
// nsBlockFrame::PlaceLine calls aLineLayout.TrimTrailingWhiteSpace()
// prior to calling aLineLayout.RelativePositionFrames().
nsPoint p = aFrame->GetPosition();
p.x -= aDeltaWidth;
aFrame->SetPosition(p);
}
bool nsLineLayout::TrimTrailingWhiteSpaceIn(PerSpanData* psd,
nscoord* aDeltaISize) {
PerFrameData* pfd = psd->mFirstFrame;
if (!pfd) {
*aDeltaISize = 0;
return false;
}
pfd = pfd->Last();
while (nullptr != pfd) {
#ifdef REALLY_NOISY_TRIM
psd->mFrame->mFrame->ListTag(stdout);
printf(": attempting trim of ");
pfd->mFrame->ListTag(stdout);
printf("\n");
#endif
PerSpanData* childSpan = pfd->mSpan;
WritingMode lineWM = mRootSpan->mWritingMode;
if (childSpan) {
// Maybe the child span has the trailing white-space in it?
if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaISize)) {
nscoord deltaISize = *aDeltaISize;
if (deltaISize) {
// Adjust the child spans frame size
pfd->mBounds.ISize(lineWM) -= deltaISize;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child spans frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
nsSize containerSize = ContainerSizeForSpan(childSpan);
nsIFrame* f = pfd->mFrame;
LogicalRect r(lineWM, f->GetRect(), containerSize);
r.ISize(lineWM) -= deltaISize;
f->SetRect(lineWM, r, containerSize);
}
// Adjust the inline end edge of the span that contains the child span
psd->mICoord -= deltaISize;
// Slide any frames that follow the child span over by the
// correct amount. The only thing that can follow the child
// span is empty stuff, so we are just making things
// sensible (keeping the combined area honest).
while (pfd->mNext) {
pfd = pfd->mNext;
pfd->mBounds.IStart(lineWM) -= deltaISize;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child span's frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, deltaISize);
}
}
}
return true;
}
} else if (!pfd->mIsTextFrame && !pfd->mSkipWhenTrimmingWhitespace) {
// If we hit a frame on the end that's not text and not a placeholder,
// then there is no trailing whitespace to trim. Stop the search.
*aDeltaISize = 0;
return true;
} else if (pfd->mIsTextFrame) {
// Call TrimTrailingWhiteSpace even on empty textframes because they
// might have a soft hyphen which should now appear, changing the frame's
// width
nsTextFrame::TrimOutput trimOutput =
static_cast<nsTextFrame*>(pfd->mFrame)
->TrimTrailingWhiteSpace(
mLineContainerRI.mRenderingContext->GetDrawTarget());
#ifdef NOISY_TRIM
psd->mFrame->mFrame->ListTag(stdout);
printf(": trim of ");
pfd->mFrame->ListTag(stdout);
printf(" returned %d\n", trimOutput.mDeltaWidth);
#endif
if (trimOutput.mChanged) {
pfd->mRecomputeOverflow = true;
}
// Delta width not being zero means that
// there is trimmed space in the frame.
if (trimOutput.mDeltaWidth) {
pfd->mBounds.ISize(lineWM) -= trimOutput.mDeltaWidth;
// If any trailing space is trimmed, the justification opportunity
// generated by the space should be removed as well.
pfd->mJustificationInfo.CancelOpportunityForTrimmedSpace();
// See if the text frame has already been placed in its parent
if (psd != mRootSpan) {
// The frame was already placed during psd's
// reflow. Update the frames rectangle now.
pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
}
// Adjust containing span's right edge
psd->mICoord -= trimOutput.mDeltaWidth;
// Slide any frames that follow the text frame over by the
// right amount. The only thing that can follow the text
// frame is empty stuff, so we are just making things
// sensible (keeping the combined area honest).
while (pfd->mNext) {
pfd = pfd->mNext;
pfd->mBounds.IStart(lineWM) -= trimOutput.mDeltaWidth;
if (psd != mRootSpan) {
// When the child span is not a direct child of the block
// we need to update the child spans frame rectangle
// because it most likely will not be done again. Spans
// that are direct children of the block will be updated
// later, however, because the VerticalAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth);
}
}
}
if (pfd->mIsNonEmptyTextFrame || trimOutput.mChanged) {
// Pass up to caller so they can shrink their span
*aDeltaISize = trimOutput.mDeltaWidth;
return true;
}
}
pfd = pfd->mPrev;
}
*aDeltaISize = 0;
return false;
}
bool nsLineLayout::TrimTrailingWhiteSpace() {
PerSpanData* psd = mRootSpan;
nscoord deltaISize;
TrimTrailingWhiteSpaceIn(psd, &deltaISize);
return 0 != deltaISize;
}
bool nsLineLayout::PerFrameData::ParticipatesInJustification() const {
if (mIsMarker || mIsEmpty || mSkipWhenTrimmingWhitespace) {
// Skip ::markers, empty frames, and placeholders
return false;
}
if (mIsTextFrame && !mIsNonWhitespaceTextFrame &&
static_cast<nsTextFrame*>(mFrame)->IsAtEndOfLine()) {
// Skip trimmed whitespaces
return false;
}
return true;
}
struct nsLineLayout::JustificationComputationState {
PerFrameData* mFirstParticipant;
PerFrameData* mLastParticipant;
// When we are going across a boundary of ruby base, i.e. entering
// one, leaving one, or both, the following fields will be set to
// the corresponding ruby base frame for handling ruby-align.
PerFrameData* mLastExitedRubyBase;
PerFrameData* mLastEnteredRubyBase;
JustificationComputationState()
: mFirstParticipant(nullptr),
mLastParticipant(nullptr),
mLastExitedRubyBase(nullptr),
mLastEnteredRubyBase(nullptr) {}
};
static bool IsRubyAlignSpaceAround(nsIFrame* aRubyBase) {
return aRubyBase->StyleText()->mRubyAlign == StyleRubyAlign::SpaceAround;
}
/**
* Assign justification gaps for justification
* opportunities across two frames.
*/
/* static */
int nsLineLayout::AssignInterframeJustificationGaps(
PerFrameData* aFrame, JustificationComputationState& aState) {
PerFrameData* prev = aState.mLastParticipant;
MOZ_ASSERT(prev);
auto& assign = aFrame->mJustificationAssignment;
auto& prevAssign = prev->mJustificationAssignment;
if (aState.mLastExitedRubyBase || aState.mLastEnteredRubyBase) {
PerFrameData* exitedRubyBase = aState.mLastExitedRubyBase;
if (!exitedRubyBase || IsRubyAlignSpaceAround(exitedRubyBase->mFrame)) {
prevAssign.mGapsAtEnd = 1;
} else {
exitedRubyBase->mJustificationAssignment.mGapsAtEnd = 1;
}
PerFrameData* enteredRubyBase = aState.mLastEnteredRubyBase;
if (!enteredRubyBase || IsRubyAlignSpaceAround(enteredRubyBase->mFrame)) {
assign.mGapsAtStart = 1;
} else {
enteredRubyBase->mJustificationAssignment.mGapsAtStart = 1;
}
// We are no longer going across a ruby base boundary.
aState.mLastExitedRubyBase = nullptr;
aState.mLastEnteredRubyBase = nullptr;
return 1;
}
const auto& info = aFrame->mJustificationInfo;
const auto& prevInfo = prev->mJustificationInfo;
if (!info.mIsStartJustifiable && !prevInfo.mIsEndJustifiable) {
return 0;
}
if (!info.mIsStartJustifiable) {
prevAssign.mGapsAtEnd = 2;
assign.mGapsAtStart = 0;
} else if (!prevInfo.mIsEndJustifiable) {
prevAssign.mGapsAtEnd = 0;
assign.mGapsAtStart = 2;
} else {
prevAssign.mGapsAtEnd = 1;
assign.mGapsAtStart = 1;
}
return 1;
}
/**
* Compute the justification info of the given span, and store the
* number of inner opportunities into the frame's justification info.
* It returns the number of non-inner opportunities it detects.
*/
int32_t nsLineLayout::ComputeFrameJustification(
PerSpanData* aPSD, JustificationComputationState& aState) {
NS_ASSERTION(aPSD, "null arg");
NS_ASSERTION(!aState.mLastParticipant || !aState.mLastParticipant->mSpan,
"Last participant shall always be a leaf frame");
bool firstChild = true;
int32_t& innerOpportunities =
aPSD->mFrame->mJustificationInfo.mInnerOpportunities;
MOZ_ASSERT(innerOpportunities == 0,
"Justification info should not have been set yet.");
int32_t outerOpportunities = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd; pfd = pfd->mNext) {
if (!pfd->ParticipatesInJustification()) {
continue;
}
bool isRubyBase = pfd->mFrame->IsRubyBaseFrame();
PerFrameData* outerRubyBase = aState.mLastEnteredRubyBase;
if (isRubyBase) {
aState.mLastEnteredRubyBase = pfd;
}
int extraOpportunities = 0;
if (pfd->mSpan) {
PerSpanData* span = pfd->mSpan;
extraOpportunities = ComputeFrameJustification(span, aState);
innerOpportunities += pfd->mJustificationInfo.mInnerOpportunities;
} else {
if (pfd->mIsTextFrame) {
innerOpportunities += pfd->mJustificationInfo.mInnerOpportunities;
}
if (!aState.mLastParticipant) {
aState.mFirstParticipant = pfd;
// It is not an empty ruby base, but we are not assigning gaps
// to the content for now. Clear the last entered ruby base so
// that we can correctly set the last exited ruby base.
aState.mLastEnteredRubyBase = nullptr;
} else {
extraOpportunities = AssignInterframeJustificationGaps(pfd, aState);
}
aState.mLastParticipant = pfd;
}
if (isRubyBase) {
if (aState.mLastEnteredRubyBase == pfd) {
// There is no justification participant inside this ruby base.
// Ignore this ruby base completely and restore the outer ruby
// base here.
aState.mLastEnteredRubyBase = outerRubyBase;
} else {
aState.mLastExitedRubyBase = pfd;
}
}
if (firstChild) {
outerOpportunities = extraOpportunities;
firstChild = false;
} else {
innerOpportunities += extraOpportunities;
}
}
return outerOpportunities;
}
void nsLineLayout::AdvanceAnnotationInlineBounds(PerFrameData* aPFD,
const nsSize& aContainerSize,
nscoord aDeltaICoord,
nscoord aDeltaISize) {
nsIFrame* frame = aPFD->mFrame;
LayoutFrameType frameType = frame->Type();
MOZ_ASSERT(frameType == LayoutFrameType::RubyText ||
frameType == LayoutFrameType::RubyTextContainer);
MOZ_ASSERT(aPFD->mSpan, "rt and rtc should have span.");
PerSpanData* psd = aPFD->mSpan;
WritingMode lineWM = mRootSpan->mWritingMode;
aPFD->mBounds.IStart(lineWM) += aDeltaICoord;
// Check whether this expansion should be counted into the reserved
// isize or not. When it is a ruby text container, and it has some
// children linked to the base, it must not have reserved isize,
// or its children won't align with their bases. Otherwise, this
// expansion should be reserved. There are two cases a ruby text
// container does not have children linked to the base:
// 1. it is a container for span; 2. its children are collapsed.
if (frameType == LayoutFrameType::RubyText ||
// This ruby text container is a span.
(psd->mFirstFrame == psd->mLastFrame && psd->mFirstFrame &&
!psd->mFirstFrame->mIsLinkedToBase)) {
// For ruby text frames, only increase frames
// which are not auto-hidden.
if (frameType != LayoutFrameType::RubyText ||
!static_cast<nsRubyTextFrame*>(frame)->IsCollapsed()) {
nscoord reservedISize = RubyUtils::GetReservedISize(frame);
RubyUtils::SetReservedISize(frame, reservedISize + aDeltaISize);
}
} else {
// It is a normal ruby text container. Its children will expand
// themselves properly. We only need to expand its own size here.
aPFD->mBounds.ISize(lineWM) += aDeltaISize;
}
aPFD->mFrame->SetRect(lineWM, aPFD->mBounds, aContainerSize);
}
/**
* This function applies the changes of icoord and isize caused by
* justification to annotations of the given frame.
*/
void nsLineLayout::ApplyLineJustificationToAnnotations(PerFrameData* aPFD,
nscoord aDeltaICoord,
nscoord aDeltaISize) {
PerFrameData* pfd = aPFD->mNextAnnotation;
while (pfd) {
nsSize containerSize = pfd->mFrame->GetParent()->GetSize();
AdvanceAnnotationInlineBounds(pfd, containerSize, aDeltaICoord,
aDeltaISize);
// There are two cases where an annotation frame has siblings which
// do not attached to a ruby base-level frame:
// 1. there's an intra-annotation whitespace which has no intra-base
// white-space to pair with;
// 2. there are not enough ruby bases to be paired with annotations.
// In these cases, their size should not be affected, but we still
// need to move them so that they won't overlap other frames.
PerFrameData* sibling = pfd->mNext;
while (sibling && !sibling->mIsLinkedToBase) {
AdvanceAnnotationInlineBounds(sibling, containerSize,
aDeltaICoord + aDeltaISize, 0);
sibling = sibling->mNext;
}
pfd = pfd->mNextAnnotation;
}
}
nscoord nsLineLayout::ApplyFrameJustification(
PerSpanData* aPSD, JustificationApplicationState& aState) {
NS_ASSERTION(aPSD, "null arg");
nscoord deltaICoord = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr;
pfd = pfd->mNext) {
nscoord dw = 0;
WritingMode lineWM = mRootSpan->mWritingMode;
const auto& assign = pfd->mJustificationAssignment;
bool isInlineText =
pfd->mIsTextFrame && !pfd->mWritingMode.IsOrthogonalTo(lineWM);
// Don't apply justification if the frame doesn't participate. Same
// as the condition used in ComputeFrameJustification. Note that,
// we still need to move the frame based on deltaICoord even if the
// frame itself doesn't expand.
if (pfd->ParticipatesInJustification()) {
if (isInlineText) {
if (aState.IsJustifiable()) {
// Set corresponding justification gaps here, so that the
// text frame knows how it should add gaps at its sides.
const auto& info = pfd->mJustificationInfo;
auto textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
textFrame->AssignJustificationGaps(assign);
dw = aState.Consume(JustificationUtils::CountGaps(info, assign));
}
if (dw) {
pfd->mRecomputeOverflow = true;
}
} else {
if (nullptr != pfd->mSpan) {
dw = ApplyFrameJustification(pfd->mSpan, aState);
}
}
} else {
MOZ_ASSERT(!assign.TotalGaps(),
"Non-participants shouldn't have assigned gaps");
}
pfd->mBounds.ISize(lineWM) += dw;
nscoord gapsAtEnd = 0;
if (!isInlineText && assign.TotalGaps()) {
// It is possible that we assign gaps to non-text frame or an
// orthogonal text frame. Apply the gaps as margin for them.
deltaICoord += aState.Consume(assign.mGapsAtStart);
gapsAtEnd = aState.Consume(assign.mGapsAtEnd);
dw += gapsAtEnd;
}
pfd->mBounds.IStart(lineWM) += deltaICoord;
// The gaps added to the end of the frame should also be
// excluded from the isize added to the annotation.
ApplyLineJustificationToAnnotations(pfd, deltaICoord, dw - gapsAtEnd);
deltaICoord += dw;
pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(aPSD));
}
return deltaICoord;
}
static nsIFrame* FindNearestRubyBaseAncestor(nsIFrame* aFrame) {
MOZ_ASSERT(aFrame->Style()->ShouldSuppressLineBreak());
while (aFrame && !aFrame->IsRubyBaseFrame()) {
aFrame = aFrame->GetParent();
}
// XXX It is possible that no ruby base ancestor is found because of
// some edge cases like form control or canvas inside ruby text.
NS_WARNING_ASSERTION(aFrame, "no ruby base ancestor?");
return aFrame;
}
/**
* This method expands the given frame by the given reserved isize.
*/
void nsLineLayout::ExpandRubyBox(PerFrameData* aFrame, nscoord aReservedISize,
const nsSize& aContainerSize) {
WritingMode lineWM = mRootSpan->mWritingMode;
auto rubyAlign = aFrame->mFrame->StyleText()->mRubyAlign;
switch (rubyAlign) {
case StyleRubyAlign::Start:
// do nothing for start
break;
case StyleRubyAlign::SpaceBetween:
case StyleRubyAlign::SpaceAround: {
int32_t opportunities = aFrame->mJustificationInfo.mInnerOpportunities;
int32_t gaps = opportunities * 2;
if (rubyAlign == StyleRubyAlign::SpaceAround) {
// Each expandable ruby box with ruby-align space-around has a
// gap at each of its sides. For rb/rbc, see comment in
// AssignInterframeJustificationGaps; for rt/rtc, see comment
// in ExpandRubyBoxWithAnnotations.
gaps += 2;
}
if (gaps > 0) {
JustificationApplicationState state(gaps, aReservedISize);
ApplyFrameJustification(aFrame->mSpan, state);
break;
}
// If there are no justification opportunities for space-between,
// fall-through to center per spec.
[[fallthrough]];
}
case StyleRubyAlign::Center:
// Indent all children by half of the reserved inline size.
for (PerFrameData* child = aFrame->mSpan->mFirstFrame; child;
child = child->mNext) {
child->mBounds.IStart(lineWM) += aReservedISize / 2;
child->mFrame->SetRect(lineWM, child->mBounds, aContainerSize);
}
break;
default:
MOZ_ASSERT_UNREACHABLE("Unknown ruby-align value");
}
aFrame->mBounds.ISize(lineWM) += aReservedISize;
aFrame->mFrame->SetRect(lineWM, aFrame->mBounds, aContainerSize);
}
/**
* This method expands the given frame by the reserved inline size.
* It also expands its annotations if they are expandable and have
* reserved isize larger than zero.
*/
void nsLineLayout::ExpandRubyBoxWithAnnotations(PerFrameData* aFrame,
const nsSize& aContainerSize) {
nscoord reservedISize = RubyUtils::GetReservedISize(aFrame->mFrame);
if (reservedISize) {
ExpandRubyBox(aFrame, reservedISize, aContainerSize);
}
WritingMode lineWM = mRootSpan->mWritingMode;
bool isLevelContainer = aFrame->mFrame->IsRubyBaseContainerFrame();
for (PerFrameData* annotation = aFrame->mNextAnnotation; annotation;
annotation = annotation->mNextAnnotation) {
if (lineWM.IsOrthogonalTo(annotation->mFrame->GetWritingMode())) {
// Inter-character case: don't attempt to expand ruby annotations.
continue;
}
if (isLevelContainer) {
nsIFrame* rtcFrame = annotation->mFrame;
MOZ_ASSERT(rtcFrame->IsRubyTextContainerFrame());
// It is necessary to set the rect again because the container
// width was unknown, and zero was used instead when we reflow
// them. The corresponding base containers were repositioned in
// VerticalAlignFrames and PlaceTopBottomFrames.
MOZ_ASSERT(rtcFrame->GetLogicalSize(lineWM) ==
annotation->mBounds.Size(lineWM));
rtcFrame->SetPosition(lineWM, annotation->mBounds.Origin(lineWM),
aContainerSize);
}
nscoord reservedISize = RubyUtils::GetReservedISize(annotation->mFrame);
if (!reservedISize) {
continue;
}
MOZ_ASSERT(annotation->mSpan);
JustificationComputationState computeState;
ComputeFrameJustification(annotation->mSpan, computeState);
if (!computeState.mFirstParticipant) {
continue;
}
if (IsRubyAlignSpaceAround(annotation->mFrame)) {
// Add one gap at each side of this annotation.
computeState.mFirstParticipant->mJustificationAssignment.mGapsAtStart = 1;
computeState.mLastParticipant->mJustificationAssignment.mGapsAtEnd = 1;
}
nsIFrame* parentFrame = annotation->mFrame->GetParent();
nsSize containerSize = parentFrame->GetSize();
MOZ_ASSERT(containerSize == aContainerSize ||
parentFrame->IsRubyTextContainerFrame(),
"Container width should only be different when the current "
"annotation is a ruby text frame, whose parent is not same "
"as its base frame.");
ExpandRubyBox(annotation, reservedISize, containerSize);
ExpandInlineRubyBoxes(annotation->mSpan);
}
}
/**
* This method looks for all expandable ruby box in the given span, and
* calls ExpandRubyBox to expand them in depth-first preorder.
*/
void nsLineLayout::ExpandInlineRubyBoxes(PerSpanData* aSpan) {
nsSize containerSize = ContainerSizeForSpan(aSpan);
for (PerFrameData* pfd = aSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
if (RubyUtils::IsExpandableRubyBox(pfd->mFrame)) {
ExpandRubyBoxWithAnnotations(pfd, containerSize);
}
if (pfd->mSpan) {
ExpandInlineRubyBoxes(pfd->mSpan);
}
}
}
nscoord nsLineLayout::GetHangFrom(const PerSpanData* aSpan,
bool aLineIsRTL) const {
const PerFrameData* pfd = aSpan->mLastFrame;
nscoord result = 0;
while (pfd) {
if (const PerSpanData* childSpan = pfd->mSpan) {
return GetHangFrom(childSpan, aLineIsRTL);
}
if (pfd->mIsTextFrame) {
auto* lastText = static_cast<nsTextFrame*>(pfd->mFrame);
result = lastText->GetHangableISize();
if (result) {
// If the hangable space will be at the start edge of the line, due to
// its bidi direction being against the line direction, we flag this by
// negating the advance.
lastText->EnsureTextRun(nsTextFrame::eInflated);
auto* textRun = lastText->GetTextRun(nsTextFrame::eInflated);
if (textRun && textRun->IsRightToLeft() != aLineIsRTL) {
result = -result;
}
}
return result;
}
if (!pfd->mSkipWhenTrimmingWhitespace) {
// If we hit a frame on the end that's not text and not a placeholder or
// <br>, then there is no trailing whitespace to hang. Stop the search.
return result;
}
// Scan back for a preceding frame whose whitespace we can hang.
pfd = pfd->mPrev;
}
return result;
}
gfxTextRun::TrimmableWS nsLineLayout::GetTrimFrom(const PerSpanData* aSpan,
bool aLineIsRTL) const {
const PerFrameData* pfd = aSpan->mLastFrame;
while (pfd) {
if (const PerSpanData* childSpan = pfd->mSpan) {
return GetTrimFrom(childSpan, aLineIsRTL);
}
if (pfd->mIsTextFrame) {
auto* lastText = static_cast<nsTextFrame*>(pfd->mFrame);
auto result = lastText->GetTrimmableWS();
if (result.mAdvance) {
lastText->EnsureTextRun(nsTextFrame::eInflated);
auto* textRun = lastText->GetTextRun(nsTextFrame::eInflated);
if (textRun && textRun->IsRightToLeft() != aLineIsRTL) {
result.mAdvance = -result.mAdvance;
}
}
return result;
}
if (!pfd->mSkipWhenTrimmingWhitespace) {
// If we hit a frame on the end that's not text and not a placeholder or
// <br>, then there is no trailing whitespace to trim. Stop the search.
return gfxTextRun::TrimmableWS{};
}
// Scan back for a preceding frame whose whitespace we can trim.
pfd = pfd->mPrev;
}
return gfxTextRun::TrimmableWS{};
}
// Align inline frames within the line according to the CSS text-align
// property.
void nsLineLayout::TextAlignLine(nsLineBox* aLine, bool aIsLastLine) {
/**
* NOTE: aIsLastLine ain't necessarily so: it is correctly set by caller
* only in cases where the last line needs special handling.
*/
PerSpanData* psd = mRootSpan;
WritingMode lineWM = psd->mWritingMode;
LAYOUT_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
nscoord availISize = psd->mIEnd - psd->mIStart;
nscoord remainingISize = availISize - aLine->ISize();
#ifdef NOISY_INLINEDIR_ALIGN
LineContainerFrame()->ListTag(stdout);
printf(": availISize=%d lineBounds.IStart=%d lineISize=%d delta=%d\n",
availISize, aLine->IStart(), aLine->ISize(), remainingISize);
#endif
nscoord dx = 0;
StyleTextAlign textAlign =
aIsLastLine ? mStyleText->TextAlignForLastLine() : mStyleText->mTextAlign;
// Check if there's trailing whitespace we need to "hang" at line-wrap.
nscoord hang = 0;
uint32_t trimCount = 0;
if (aLine->IsLineWrapped()) {
if (textAlign == StyleTextAlign::Justify) {
auto trim = GetTrimFrom(mRootSpan, lineWM.IsBidiRTL());
hang = NSToCoordRound(trim.mAdvance);
trimCount = trim.mCount;
} else {
hang = GetHangFrom(mRootSpan, lineWM.IsBidiRTL());
}
}
bool isSVG = LineContainerFrame()->IsInSVGTextSubtree();
bool doTextAlign = remainingISize > 0 || hang != 0;
int32_t additionalGaps = 0;
if (!isSVG &&
(mHasRuby || (doTextAlign && textAlign == StyleTextAlign::Justify))) {
JustificationComputationState computeState;
ComputeFrameJustification(psd, computeState);
if (mHasRuby && computeState.mFirstParticipant) {
PerFrameData* firstFrame = computeState.mFirstParticipant;
if (firstFrame->mFrame->Style()->ShouldSuppressLineBreak()) {
MOZ_ASSERT(!firstFrame->mJustificationAssignment.mGapsAtStart);
nsIFrame* rubyBase = FindNearestRubyBaseAncestor(firstFrame->mFrame);
if (rubyBase && IsRubyAlignSpaceAround(rubyBase)) {
firstFrame->mJustificationAssignment.mGapsAtStart = 1;
additionalGaps++;
}
}
PerFrameData* lastFrame = computeState.mLastParticipant;
if (lastFrame->mFrame->Style()->ShouldSuppressLineBreak()) {
MOZ_ASSERT(!lastFrame->mJustificationAssignment.mGapsAtEnd);
nsIFrame* rubyBase = FindNearestRubyBaseAncestor(lastFrame->mFrame);
if (rubyBase && IsRubyAlignSpaceAround(rubyBase)) {
lastFrame->mJustificationAssignment.mGapsAtEnd = 1;
additionalGaps++;
}
}
}
}
if (!isSVG && doTextAlign) {
switch (textAlign) {
case StyleTextAlign::Justify: {
int32_t opportunities =
psd->mFrame->mJustificationInfo.mInnerOpportunities -
(hang ? trimCount : 0);
if (opportunities > 0) {
int32_t gaps = opportunities * 2 + additionalGaps;
remainingISize += std::abs(hang);
JustificationApplicationState applyState(gaps, remainingISize);
// Apply the justification, and make sure to update our linebox
// width to account for it.
aLine->ExpandBy(ApplyFrameJustification(psd, applyState),
ContainerSizeForSpan(psd));
// If the trimmable trailing whitespace that we want to hang had
// reverse-inline directionality, adjust line position to account for
// it being at the inline-start side.
// On top of the original "hang" amount, justification will have
// modified its width, so we include that adjustment here.
if (hang < 0) {
dx = hang - trimCount * remainingISize / opportunities;
}
// Gaps that belong to trimmed whitespace were not included in the
// applyState count, so we need to add them here for the assert.
DebugOnly<int32_t> trimmedGaps = hang ? trimCount * 2 : 0;
MOZ_ASSERT(applyState.mGaps.mHandled ==
applyState.mGaps.mCount + trimmedGaps,
"Unprocessed justification gaps");
// Similarly, account for the adjustment applied to the trimmed
// whitespace, which is in addition to the adjustment that applies
// within the actual width of the line.
DebugOnly<int32_t> trimmedAdjustment =
trimCount * remainingISize / opportunities;
NS_ASSERTION(applyState.mWidth.mConsumed ==
applyState.mWidth.mAvailable + trimmedAdjustment,
"Unprocessed justification width");
break;
}
// Fall through to the default case if we could not justify to fill
// the space.
[[fallthrough]];
}
case StyleTextAlign::Start:
case StyleTextAlign::Char:
// Default alignment is to start edge so do nothing, except to apply
// any "reverse-hang" amount resulting from reversed-direction trailing
// space.
// Char is for tables so treat as start if we find it in block layout.
if (hang < 0) {
dx = hang;
}
break;
case StyleTextAlign::Left:
case StyleTextAlign::MozLeft:
if (lineWM.IsBidiRTL()) {
dx = remainingISize + (hang > 0 ? hang : 0);
} else if (hang < 0) {
dx = hang;
}
break;
case StyleTextAlign::Right:
case StyleTextAlign::MozRight:
if (lineWM.IsBidiLTR()) {
dx = remainingISize + (hang > 0 ? hang : 0);
} else if (hang < 0) {
dx = hang;
}
break;
case StyleTextAlign::End:
dx = remainingISize + (hang > 0 ? hang : 0);
break;
case StyleTextAlign::Center:
case StyleTextAlign::MozCenter:
dx = (remainingISize + hang) / 2;
break;
}
}
if (mHasRuby) {
ExpandInlineRubyBoxes(mRootSpan);
}
PerFrameData* startFrame = psd->mFirstFrame;
MOZ_ASSERT(startFrame, "empty line?");
if (startFrame->mIsMarker) {
// ::marker shouldn't participate in bidi reordering nor text alignment.
startFrame = startFrame->mNext;
MOZ_ASSERT(startFrame, "no frame after ::marker?");
MOZ_ASSERT(!startFrame->mIsMarker, "multiple ::markers?");
}
const bool bidi = mPresContext->BidiEnabled() &&
(!mPresContext->IsVisualMode() || lineWM.IsBidiRTL());
if (bidi) {
nsBidiPresUtils::ReorderFrames(startFrame->mFrame, aLine->GetChildCount(),
lineWM, mContainerSize,
psd->mIStart + mTextIndent + dx);
}
if (dx) {
// For the bidi case, if startFrame is a ::first-line frame, the mIStart and
// mTextIndent offsets will already have been applied to its position, but
// we still need to apply the text-align adjustment |dx| to its position.
const bool needToAdjustFrames = !bidi || startFrame->mFrame->IsLineFrame();
MOZ_ASSERT_IF(startFrame->mFrame->IsLineFrame(), !startFrame->mNext);
if (needToAdjustFrames) {
for (PerFrameData* pfd = startFrame; pfd; pfd = pfd->mNext) {
pfd->mBounds.IStart(lineWM) += dx;
pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
}
}
aLine->IndentBy(dx, ContainerSize());
}
}
// This method applies any relative positioning to the given frame.
void nsLineLayout::ApplyRelativePositioning(PerFrameData* aPFD) {
if (!aPFD->mIsRelativelyOrStickyPos) {
return;
}
nsIFrame* frame = aPFD->mFrame;
WritingMode frameWM = aPFD->mWritingMode;
LogicalPoint origin = frame->GetLogicalPosition(ContainerSize());
// right and bottom are handled by
// ReflowInput::ComputeRelativeOffsets
ReflowInput::ApplyRelativePositioning(frame, frameWM, aPFD->mOffsets, &origin,
ContainerSize());
frame->SetPosition(frameWM, origin, ContainerSize());
}
// This method do relative positioning for ruby annotations.
void nsLineLayout::RelativePositionAnnotations(PerSpanData* aRubyPSD,
OverflowAreas& aOverflowAreas) {
MOZ_ASSERT(aRubyPSD->mFrame->mFrame->IsRubyFrame());
for (PerFrameData* pfd = aRubyPSD->mFirstFrame; pfd; pfd = pfd->mNext) {
MOZ_ASSERT(pfd->mFrame->IsRubyBaseContainerFrame());
for (PerFrameData* rtc = pfd->mNextAnnotation; rtc;
rtc = rtc->mNextAnnotation) {
nsIFrame* rtcFrame = rtc->mFrame;
MOZ_ASSERT(rtcFrame->IsRubyTextContainerFrame());
ApplyRelativePositioning(rtc);
OverflowAreas rtcOverflowAreas;
RelativePositionFrames(rtc->mSpan, rtcOverflowAreas);
aOverflowAreas.UnionWith(rtcOverflowAreas + rtcFrame->GetPosition());
}
}
}
void nsLineLayout::RelativePositionFrames(PerSpanData* psd,
OverflowAreas& aOverflowAreas) {
OverflowAreas overflowAreas;
WritingMode wm = psd->mWritingMode;
if (psd != mRootSpan) {
// The span's overflow areas come in three parts:
// -- this frame's width and height
// -- pfd->mOverflowAreas, which is the area of a ::marker or the union
// of a relatively positioned frame's absolute children
// -- the bounds of all inline descendants
// The former two parts are computed right here, we gather the descendants
// below.
// At this point psd->mFrame->mBounds might be out of date since
// bidi reordering can move and resize the frames. So use the frame's
// rect instead of mBounds.
nsRect adjustedBounds(nsPoint(0, 0), psd->mFrame->mFrame->GetSize());
overflowAreas.ScrollableOverflow().UnionRect(
psd->mFrame->mOverflowAreas.ScrollableOverflow(), adjustedBounds);
overflowAreas.InkOverflow().UnionRect(
psd->mFrame->mOverflowAreas.InkOverflow(), adjustedBounds);
} else {
LogicalRect rect(wm, psd->mIStart, mBStartEdge, psd->mICoord - psd->mIStart,
mFinalLineBSize);
// The minimum combined area for the frames that are direct
// children of the block starts at the upper left corner of the
// line and is sized to match the size of the line's bounding box
// (the same size as the values returned from VerticalAlignFrames)
overflowAreas.InkOverflow() = rect.GetPhysicalRect(wm, ContainerSize());
overflowAreas.ScrollableOverflow() = overflowAreas.InkOverflow();
}
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
nsIFrame* frame = pfd->mFrame;
// Adjust the origin of the frame
ApplyRelativePositioning(pfd);
// We must position the view correctly before positioning its
// descendants so that widgets are positioned properly (since only
// some views have widgets).
if (frame->HasView())
nsContainerFrame::SyncFrameViewAfterReflow(
mPresContext, frame, frame->GetView(),
pfd->mOverflowAreas.InkOverflow(),
nsIFrame::ReflowChildFlags::NoSizeView);
// Note: the combined area of a child is in its coordinate
// system. We adjust the childs combined area into our coordinate
// system before computing the aggregated value by adding in
// <b>x</b> and <b>y</b> which were computed above.
OverflowAreas r;
if (pfd->mSpan) {
// Compute a new combined area for the child span before
// aggregating it into our combined area.
RelativePositionFrames(pfd->mSpan, r);
} else {
r = pfd->mOverflowAreas;
if (pfd->mIsTextFrame) {
// We need to recompute overflow areas in four cases:
// (1) When PFD_RECOMPUTEOVERFLOW is set due to trimming
// (2) When there are text decorations, since we can't recompute the
// overflow area until Reflow and VerticalAlignLine have finished
// (3) When there are text emphasis marks, since the marks may be
// put further away if the text is inside ruby.
// (4) When there are text strokes
if (pfd->mRecomputeOverflow ||
frame->Style()->HasTextDecorationLines() ||
frame->StyleText()->HasEffectiveTextEmphasis() ||
frame->StyleText()->HasWebkitTextStroke()) {
nsTextFrame* f = static_cast<nsTextFrame*>(frame);
r = f->RecomputeOverflow(LineContainerFrame());
}
frame->FinishAndStoreOverflow(r, frame->GetSize());
}
// If we have something that's not an inline but with a complex frame
// hierarchy inside that contains views, they need to be
// positioned.
// All descendant views must be repositioned even if this frame
// does have a view in case this frame's view does not have a
// widget and some of the descendant views do have widgets --
// otherwise the widgets won't be repositioned.
nsContainerFrame::PositionChildViews(frame);
}
// Do this here (rather than along with setting the overflow rect
// below) so we get leaf frames as well. No need to worry
// about the root span, since it doesn't have a frame.
if (frame->HasView())
nsContainerFrame::SyncFrameViewAfterReflow(
mPresContext, frame, frame->GetView(), r.InkOverflow(),
nsIFrame::ReflowChildFlags::NoMoveView);
overflowAreas.UnionWith(r + frame->GetPosition());
}
// Also compute relative position in the annotations.
if (psd->mFrame->mFrame->IsRubyFrame()) {
RelativePositionAnnotations(psd, overflowAreas);
}
// If we just computed a spans combined area, we need to update its
// overflow rect...
if (psd != mRootSpan) {
PerFrameData* spanPFD = psd->mFrame;
nsIFrame* frame = spanPFD->mFrame;
frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize());
}
aOverflowAreas = overflowAreas;
}