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gecko/layout/generic/nsLineLayout.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* state and methods used while laying out a single line of a block frame */
// This has to be defined before nsLineLayout.h is included, because
// nsLineLayout.h has a #include for plarena.h, which needs this defined:
#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
#include "nsLineLayout.h"
#include "SVGTextFrame.h"
#include "nsBlockFrame.h"
#include "nsStyleConsts.h"
#include "nsContainerFrame.h"
#include "nsFloatManager.h"
#include "nsStyleContext.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsLayoutUtils.h"
#include "nsTextFrame.h"
#include "nsStyleStructInlines.h"
#include "nsBidiPresUtils.h"
#include <algorithm>
#ifdef DEBUG
#undef NOISY_INLINEDIR_ALIGN
#undef NOISY_BLOCKDIR_ALIGN
#undef REALLY_NOISY_BLOCKDIR_ALIGN
#undef NOISY_REFLOW
#undef REALLY_NOISY_REFLOW
#undef NOISY_PUSHING
#undef REALLY_NOISY_PUSHING
#undef DEBUG_ADD_TEXT
#undef NOISY_MAX_ELEMENT_SIZE
#undef REALLY_NOISY_MAX_ELEMENT_SIZE
#undef NOISY_CAN_PLACE_FRAME
#undef NOISY_TRIM
#undef REALLY_NOISY_TRIM
#endif
using namespace mozilla;
//----------------------------------------------------------------------
#define FIX_BUG_50257
nsLineLayout::nsLineLayout(nsPresContext* aPresContext,
nsFloatManager* aFloatManager,
const nsHTMLReflowState* aOuterReflowState,
const nsLineList::iterator* aLine)
: mPresContext(aPresContext),
mFloatManager(aFloatManager),
mBlockReflowState(aOuterReflowState),
mLastOptionalBreakContent(nullptr),
mForceBreakContent(nullptr),
mBlockRS(nullptr),/* XXX temporary */
mLastOptionalBreakPriority(gfxBreakPriority::eNoBreak),
mLastOptionalBreakContentOffset(-1),
mForceBreakContentOffset(-1),
mMinLineBSize(0),
mTextIndent(0),
mFirstLetterStyleOK(false),
mIsTopOfPage(false),
mImpactedByFloats(false),
mLastFloatWasLetterFrame(false),
mLineIsEmpty(false),
mLineEndsInBR(false),
mNeedBackup(false),
mInFirstLine(false),
mGotLineBox(false),
mInFirstLetter(false),
mHasBullet(false),
mDirtyNextLine(false),
mLineAtStart(false)
{
MOZ_ASSERT(aOuterReflowState, "aOuterReflowState must not be null");
NS_ASSERTION(aFloatManager || aOuterReflowState->frame->GetType() ==
nsGkAtoms::letterFrame,
"float manager should be present");
MOZ_COUNT_CTOR(nsLineLayout);
// Stash away some style data that we need
nsBlockFrame* blockFrame = do_QueryFrame(aOuterReflowState->frame);
if (blockFrame)
mStyleText = blockFrame->StyleTextForLineLayout();
else
mStyleText = aOuterReflowState->frame->StyleText();
mLineNumber = 0;
mTotalPlacedFrames = 0;
mBStartEdge = 0;
mTrimmableWidth = 0;
mInflationMinFontSize =
nsLayoutUtils::InflationMinFontSizeFor(aOuterReflowState->frame);
// 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.
PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024);
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");
PL_FinishArenaPool(&mArena);
}
// 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,
nscoord aContainerWidth)
{
NS_ASSERTION(nullptr == mRootSpan, "bad linelayout user");
NS_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) && CRAZY_SIZE(aISize)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": Init: bad caller: width WAS %d(0x%x)\n",
aISize, aISize);
}
if ((aBSize != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(aBSize)) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": Init: bad caller: height WAS %d(0x%x)\n",
aBSize, aBSize);
}
#endif
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
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;
mLineIsEmpty = true;
mLineAtStart = true;
mLineEndsInBR = false;
mSpanDepth = 0;
mMaxStartBoxBSize = mMaxEndBoxBSize = 0;
if (mGotLineBox) {
mLineBox->ClearHasBullet();
}
PerSpanData* psd = NewPerSpanData();
mCurrentSpan = mRootSpan = psd;
psd->mReflowState = mBlockReflowState;
psd->mIStart = aICoord;
psd->mICoord = aICoord;
psd->mIEnd = aICoord + aISize;
mContainerWidth = aContainerWidth;
// If we're in a constrained height frame, then we don't allow a
// max line box width to take effect.
if (!(LineContainerFrame()->GetStateBits() &
NS_FRAME_IN_CONSTRAINED_HEIGHT)) {
// If the available size is greater than the maximum line box width (if
// specified), then we need to adjust the line box width to be at the max
// possible width.
nscoord maxLineBoxWidth =
LineContainerFrame()->PresContext()->PresShell()->MaxLineBoxWidth();
if (maxLineBoxWidth > 0 &&
psd->mIEnd - psd->mIStart > maxLineBoxWidth) {
psd->mIEnd = psd->mIStart + maxLineBoxWidth;
}
}
mBStartEdge = aBCoord;
psd->mNoWrap =
!mStyleText->WhiteSpaceCanWrapStyle() || LineContainerFrame()->IsSVGText();
psd->mWritingMode = aWritingMode;
// If this is the first line of a block then see if the text-indent
// property amounts to anything.
if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowState->frame)) {
const nsStyleCoord &textIndent = mStyleText->mTextIndent;
nscoord pctBasis = 0;
if (textIndent.HasPercent()) {
pctBasis =
nsHTMLReflowState::GetContainingBlockContentWidth(mBlockReflowState);
if (mGotLineBox) {
mLineBox->DisableResizeReflowOptimization();
}
}
nscoord indent = nsRuleNode::ComputeCoordPercentCalc(textIndent, pctBasis);
mTextIndent = indent;
psd->mICoord += indent;
}
}
void
nsLineLayout::EndLineReflow()
{
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": EndLineReflow: width=%d\n", mRootSpan->mICoord - mRootSpan->mIStart);
#endif
FreeSpan(mRootSpan);
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
}
// 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(const nsRect& aNewAvailSpace,
nsIFrame* aFloatFrame)
{
WritingMode lineWM = mRootSpan->mWritingMode;
LogicalRect availSpace(lineWM, aNewAvailSpace, mContainerWidth);
#ifdef REALLY_NOISY_REFLOW
printf("nsLL::UpdateBand %d, %d, %d, %d, (logical %d, %d, %d, %d); frame=%p\n will set mImpacted to true\n",
aNewAvailSpace.x, aNewAvailSpace.y,
aNewAvailSpace.width, aNewAvailSpace.height,
availSpace.IStart(lineWM), availSpace.BStart(lineWM),
availSpace.ISize(lineWM), availSpace.BSize(lineWM),
aFloatFrame);
#endif
#ifdef DEBUG
if ((availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
CRAZY_SIZE(availSpace.ISize(lineWM))) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: bad caller: ISize WAS %d(0x%x)\n",
availSpace.ISize(lineWM), availSpace.ISize(lineWM));
}
if ((availSpace.BSize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
CRAZY_SIZE(availSpace.BSize(lineWM))) {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
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_WARN_IF_FALSE(mRootSpan->mIEnd != NS_UNCONSTRAINEDSIZE &&
aNewAvailSpace.width != NS_UNCONSTRAINEDSIZE,
"have unconstrained width; 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 width of all spans changes by this much (the root span's
// mIEnd moves to aICoord + aISize, its new width is aISize)
nscoord deltaISize = availSpace.ISize(lineWM) -
(mRootSpan->mIEnd - mRootSpan->mIStart);
#ifdef NOISY_REFLOW
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": UpdateBand: %d,%d,%d,%d deltaISize=%d deltaICoord=%d\n",
aNewAvailSpace.x, aNewAvailSpace.y,
aNewAvailSpace.width, aNewAvailSpace.height, 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 = aNewAvailSpace.y;
mImpactedByFloats = true;
mLastFloatWasLetterFrame = nsGkAtoms::letterFrame == aFloatFrame->GetType();
}
nsLineLayout::PerSpanData*
nsLineLayout::NewPerSpanData()
{
PerSpanData* psd = mSpanFreeList;
if (!psd) {
void *mem;
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerSpanData));
if (!mem) {
NS_RUNTIMEABORT("OOM");
}
psd = reinterpret_cast<PerSpanData*>(mem);
}
else {
mSpanFreeList = psd->mNextFreeSpan;
}
psd->mParent = nullptr;
psd->mFrame = nullptr;
psd->mFirstFrame = nullptr;
psd->mLastFrame = nullptr;
psd->mContainsFloat = false;
psd->mZeroEffectiveSpanBox = false;
psd->mHasNonemptyContent = false;
#ifdef DEBUG
mSpansAllocated++;
#endif
return psd;
}
void
nsLineLayout::BeginSpan(nsIFrame* aFrame,
const nsHTMLReflowState* aSpanReflowState,
nscoord aIStart, nscoord aIEnd,
nscoord* aBaseline)
{
NS_ASSERTION(aIEnd != NS_UNCONSTRAINEDSIZE,
"should no longer be using unconstrained sizes");
#ifdef NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth+1);
nsFrame::ListTag(stdout, aFrame);
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->mReflowState = aSpanReflowState;
psd->mIStart = aIStart;
psd->mICoord = aIStart;
psd->mIEnd = aIEnd;
psd->mBaseline = aBaseline;
nsIFrame* frame = aSpanReflowState->frame;
psd->mNoWrap = !frame->StyleText()->WhiteSpaceCanWrap(frame);
psd->mWritingMode = aSpanReflowState->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
nsFrame::IndentBy(stdout, mSpanDepth);
nsFrame::ListTag(stdout, aFrame);
printf(": EndSpan width=%d\n", mCurrentSpan->mICoord - mCurrentSpan->mIStart);
#endif
PerSpanData* psd = mCurrentSpan;
nscoord iSizeResult = psd->mLastFrame ? (psd->mICoord - psd->mIStart) : 0;
mSpanDepth--;
mCurrentSpan->mReflowState = nullptr; // no longer valid so null it out!
mCurrentSpan = mCurrentSpan->mParent;
return iSizeResult;
}
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 release all of the frames following pfd
pfd = next;
while (nullptr != pfd) {
next = pfd->mNext;
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
if (nullptr != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
pfd = 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
nsFrame::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 free it, and if it has a span, free that too
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
if (nullptr != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
#ifdef NOISY_PUSHING
nsFrame::IndentBy(stdout, mSpanDepth);
printf("PushFrame: %p after:\n", psd);
DumpPerSpanData(psd, 1);
#endif
}
void
nsLineLayout::FreeSpan(PerSpanData* psd)
{
// Free its frames
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
if (nullptr != pfd->mSpan) {
FreeSpan(pfd->mSpan);
}
PerFrameData* next = pfd->mNext;
pfd->mNext = mFrameFreeList;
mFrameFreeList = pfd;
#ifdef DEBUG
mFramesFreed++;
#endif
pfd = next;
}
// Now put the span on the free list since it's free too
psd->mNextFreeSpan = mSpanFreeList;
mSpanFreeList = psd;
#ifdef DEBUG
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)
{
PerFrameData* pfd = mFrameFreeList;
if (!pfd) {
void *mem;
PL_ARENA_ALLOCATE(mem, &mArena, sizeof(PerFrameData));
if (!mem) {
NS_RUNTIMEABORT("OOM");
}
pfd = reinterpret_cast<PerFrameData*>(mem);
}
else {
mFrameFreeList = pfd->mNext;
}
pfd->mSpan = nullptr;
pfd->mNext = nullptr;
pfd->mPrev = nullptr;
pfd->mFlags = 0; // all flags default to false
pfd->mFrame = aFrame;
WritingMode frameWM = aFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
pfd->mBounds = LogicalRect(lineWM);
pfd->mMargin = LogicalMargin(frameWM);
pfd->mBorderPadding = LogicalMargin(frameWM);
pfd->mOffsets = LogicalMargin(frameWM);
#ifdef DEBUG
pfd->mBlockDirAlign = 0xFF;
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.
static bool
HasPercentageUnitSide(const nsStyleSides& aSides)
{
NS_FOR_CSS_SIDES(side) {
if (aSides.Get(side).HasPercent())
return true;
}
return false;
}
static bool
IsPercentageAware(const nsIFrame* aFrame)
{
NS_ASSERTION(aFrame, "null frame is not allowed");
nsIAtom *fType = aFrame->GetType();
if (fType == nsGkAtoms::textFrame) {
// 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 == nsGkAtoms::inlineFrame), 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->WidthDependsOnContainer() &&
pos->mWidth.GetUnit() != eStyleUnit_Auto) ||
pos->MaxWidthDependsOnContainer() ||
pos->MinWidthDependsOnContainer() ||
pos->OffsetHasPercent(NS_SIDE_RIGHT) ||
pos->OffsetHasPercent(NS_SIDE_LEFT)) {
return true;
}
if (eStyleUnit_Auto == pos->mWidth.GetUnit()) {
// We need to check for frames that shrink-wrap when they're auto
// width.
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if (disp->mDisplay == NS_STYLE_DISPLAY_INLINE_BLOCK ||
disp->mDisplay == NS_STYLE_DISPLAY_INLINE_TABLE ||
fType == nsGkAtoms::HTMLButtonControlFrame ||
fType == nsGkAtoms::gfxButtonControlFrame ||
fType == nsGkAtoms::fieldSetFrame ||
fType == nsGkAtoms::comboboxDisplayFrame) {
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->GetIntrinsicRatio() != nsSize(0, 0) &&
// Some percents are treated like 'auto', so check != coord
pos->mHeight.GetUnit() != eStyleUnit_Coord) {
const IntrinsicSize &intrinsicSize = f->GetIntrinsicSize();
if (intrinsicSize.width.GetUnit() == eStyleUnit_None &&
intrinsicSize.height.GetUnit() == eStyleUnit_None) {
return true;
}
}
}
return false;
}
nsresult
nsLineLayout::ReflowFrame(nsIFrame* aFrame,
nsReflowStatus& aReflowStatus,
nsHTMLReflowMetrics* aMetrics,
bool& aPushedFrame)
{
// Initialize OUT parameter
aPushedFrame = false;
PerFrameData* pfd = NewPerFrameData(aFrame);
PerSpanData* psd = mCurrentSpan;
psd->AppendFrame(pfd);
#ifdef REALLY_NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth);
printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
nsFrame::ListTag(stdout, aFrame);
printf("\n");
#endif
mTextJustificationNumSpaces = 0;
mTextJustificationNumLetters = 0;
// Stash copies of some of the computed state away for later
// (block-direction alignment, for example)
WritingMode frameWM = aFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
// NOTE: While the x coordinate remains relative to the parent span,
// the y coordinate is fixed at the top edge for the line. During
// BlockDirAlignFrames we will repair this so that the y 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
nsIAtom* frameType = aFrame->GetType();
bool isText = frameType == nsGkAtoms::textFrame;
// Compute the available size for the frame. This available width
// includes room for the side margins.
// For now, set the available height to unconstrained always.
nsSize availSize(mBlockReflowState->ComputedWidth(), NS_UNCONSTRAINEDSIZE);
// 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.
NS_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;
// Setup reflow state for reflowing the frame
Maybe<nsHTMLReflowState> reflowStateHolder;
if (!isText) {
reflowStateHolder.construct(mPresContext, *psd->mReflowState,
aFrame, availSize);
nsHTMLReflowState& reflowState = reflowStateHolder.ref();
reflowState.mLineLayout = this;
reflowState.mFlags.mIsTopOfPage = mIsTopOfPage;
if (reflowState.ComputedWidth() == NS_UNCONSTRAINEDSIZE)
reflowState.AvailableWidth() = availableSpaceOnLine;
WritingMode stateWM = reflowState.GetWritingMode();
pfd->mMargin =
reflowState.ComputedLogicalMargin().ConvertTo(frameWM, stateWM);
pfd->mBorderPadding =
reflowState.ComputedLogicalBorderPadding().ConvertTo(frameWM, stateWM);
pfd->SetFlag(PFD_RELATIVEPOS,
reflowState.mStyleDisplay->IsRelativelyPositionedStyle());
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
pfd->mOffsets =
reflowState.ComputedLogicalOffsets().ConvertTo(frameWM, stateWM);
}
// Apply start margins (as appropriate) to the frame computing the
// new starting x,y coordinates for the frame.
ApplyStartMargin(pfd, reflowState);
}
// 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 width 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
// nsHTMLReflowState, because that construction may be what forces aFrame
// to lazily initialize its (possibly-percent-valued) intrinsic size.)
if (mGotLineBox && IsPercentageAware(aFrame)) {
mLineBox->DisableResizeReflowOptimization();
}
// Let frame know that are reflowing it. 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
aFrame->WillReflow(mPresContext);
// Adjust spacemanager coordinate system for the frame.
nsHTMLReflowMetrics metrics(lineWM);
#ifdef DEBUG
metrics.Width() = nscoord(0xdeadbeef);
metrics.Height() = nscoord(0xdeadbeef);
#endif
nsRect physicalBounds = pfd->mBounds.GetPhysicalRect(lineWM, mContainerWidth);
nscoord tx = physicalBounds.x;
nscoord ty = physicalBounds.y;
mFloatManager->Translate(tx, ty);
int32_t savedOptionalBreakOffset;
gfxBreakPriority savedOptionalBreakPriority;
nsIContent* savedOptionalBreakContent =
GetLastOptionalBreakPosition(&savedOptionalBreakOffset,
&savedOptionalBreakPriority);
if (!isText) {
nsresult rv = aFrame->Reflow(mPresContext, metrics, reflowStateHolder.ref(),
aReflowStatus);
if (NS_FAILED(rv)) {
NS_WARNING( "Reflow of frame failed in nsLineLayout" );
return rv;
}
} else {
static_cast<nsTextFrame*>(aFrame)->
ReflowText(*this, availableSpaceOnLine, psd->mReflowState->rendContext,
metrics, aReflowStatus);
}
pfd->mJustificationNumSpaces = mTextJustificationNumSpaces;
pfd->mJustificationNumLetters = mTextJustificationNumLetters;
// 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) {
isEmpty = pfd->mFrame->IsEmpty();
} else {
if (nsGkAtoms::placeholderFrame == frameType) {
isEmpty = true;
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true);
nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
if (outOfFlowFrame) {
// Add mTrimmableWidth to the available width since if the line ends
// here, the width of the inline content will be reduced by
// mTrimmableWidth.
nscoord availableWidth = psd->mIEnd - (psd->mICoord - mTrimmableWidth);
if (psd->mNoWrap) {
// If we place floats after inline content where there's
// no break opportunity, we don't know how much additional
// width is required for the non-breaking content after the float,
// so we can't know whether the float plus that content will fit
// on the line. So for now, don't place floats after inline
// content where there's no break opportunity. This is incorrect
// but hopefully rare. Fixing it will require significant
// restructuring of line layout.
// We might as well allow zero-width floats to be placed, though.
availableWidth = 0;
}
placedFloat = AddFloat(outOfFlowFrame, availableWidth);
NS_ASSERTION(!(outOfFlowFrame->GetType() == nsGkAtoms::letterFrame &&
GetFirstLetterStyleOK()),
"FirstLetterStyle set on line with floating first letter");
}
}
else if (isText) {
// Note non-empty text-frames for inline frame compatibility hackery
pfd->SetFlag(PFD_ISTEXTFRAME, true);
nsTextFrame* textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
isEmpty = !textFrame->HasNoncollapsedCharacters();
if (!isEmpty) {
pfd->SetFlag(PFD_ISNONEMPTYTEXTFRAME, true);
nsIContent* content = textFrame->GetContent();
const nsTextFragment* frag = content->GetText();
if (frag) {
pfd->SetFlag(PFD_ISNONWHITESPACETEXTFRAME,
!content->TextIsOnlyWhitespace());
}
}
}
else if (nsGkAtoms::brFrame == frameType) {
pfd->SetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE, true);
isEmpty = false;
} else {
if (nsGkAtoms::letterFrame==frameType) {
pfd->SetFlag(PFD_ISLETTERFRAME, true);
}
if (pfd->mSpan) {
isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty();
} else {
isEmpty = pfd->mFrame->IsEmpty();
}
}
}
mFloatManager->Translate(-tx, -ty);
NS_ASSERTION(metrics.Width() >= 0, "bad width");
NS_ASSERTION(metrics.Height() >= 0,"bad height");
if (metrics.Width() < 0) metrics.Width() = 0;
if (metrics.Height() < 0) metrics.Height() = 0;
#ifdef DEBUG
// Note: break-before means ignore the reflow metrics since the
// frame will be reflowed another time.
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
if (CRAZY_SIZE(metrics.Width()) || CRAZY_SIZE(metrics.Height())) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" metrics=%d,%d!\n", metrics.Width(), metrics.Height());
}
if ((metrics.Width() == nscoord(0xdeadbeef)) ||
(metrics.Height() == nscoord(0xdeadbeef))) {
printf("nsLineLayout: ");
nsFrame::ListTag(stdout, aFrame);
printf(" didn't set w/h %d,%d!\n", metrics.Width(), metrics.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 = metrics.mOverflowAreas;
pfd->mBounds.ISize(lineWM) = metrics.ISize();
pfd->mBounds.BSize(lineWM) = metrics.BSize();
// Size the frame, but |RelativePositionFrames| will size the view.
aFrame->SetSize(nsSize(metrics.Width(), metrics.Height()));
// Tell the frame that we're done reflowing it
aFrame->DidReflow(mPresContext,
isText ? nullptr : reflowStateHolder.addr(),
nsDidReflowStatus::FINISHED);
if (aMetrics) {
*aMetrics = metrics;
}
if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
// 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 (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
nsIFrame* kidNextInFlow = aFrame->GetNextInFlow();
if (nullptr != kidNextInFlow) {
// 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)
nsContainerFrame* parent = static_cast<nsContainerFrame*>
(kidNextInFlow->GetParent());
parent->DeleteNextInFlowChild(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 mTrimmableWidth if this isn't a text frame
if (!continuingTextRun && !pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
mTrimmableWidth = 0;
}
// See if we can place the frame. If we can't fit it, then we
// return now.
bool optionalBreakAfterFits;
NS_ASSERTION(isText ||
!reflowStateHolder.ref().IsFloating(),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
if (CanPlaceFrame(pfd, notSafeToBreak, continuingTextRun,
savedOptionalBreakContent != nullptr, metrics,
aReflowStatus, &optionalBreakAfterFits)) {
if (!isEmpty) {
psd->mHasNonemptyContent = true;
mLineIsEmpty = false;
if (!pfd->mSpan) {
// nonempty leaf content has been placed
mLineAtStart = false;
}
}
// Place the frame, updating aBounds with the final size and
// location. Then apply the bottom+right margins (as
// appropriate) to the frame.
PlaceFrame(pfd, metrics);
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.
BlockDirAlignFrames(span);
}
if (!continuingTextRun) {
if (!psd->mNoWrap && (!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 (NotifyOptionalBreakPosition(aFrame->GetContent(), INT32_MAX, optionalBreakAfterFits, gfxBreakPriority::eNormalBreak)) {
// If this returns true then we are being told to actually break here.
aReflowStatus = NS_INLINE_LINE_BREAK_AFTER(aReflowStatus);
}
}
}
}
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(savedOptionalBreakContent,
savedOptionalBreakOffset,
savedOptionalBreakPriority);
}
}
else {
PushFrame(aFrame);
}
#ifdef REALLY_NOISY_REFLOW
nsFrame::IndentBy(stdout, mSpanDepth);
printf("End ReflowFrame ");
nsFrame::ListTag(stdout, aFrame);
printf(" status=%x\n", aReflowStatus);
#endif
return NS_OK;
}
void
nsLineLayout::ApplyStartMargin(PerFrameData* pfd,
nsHTMLReflowState& aReflowState)
{
NS_ASSERTION(!aReflowState.IsFloating(),
"How'd we get a floated inline frame? "
"The frame ctor should've dealt with this.");
WritingMode frameWM = pfd->mFrame->GetWritingMode();
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.
if (pfd->mFrame->GetPrevContinuation() ||
pfd->mFrame->FrameIsNonFirstInIBSplit()) {
// 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(frameWM) = 0;
}
if ((pfd->mFrame->LastInFlow()->GetNextContinuation() ||
pfd->mFrame->FrameIsNonLastInIBSplit())
&& !pfd->GetFlag(PFD_ISLETTERFRAME)) {
pfd->mMargin.IEnd(frameWM) = 0;
}
nscoord startMargin = pfd->mMargin.ConvertTo(lineWM, frameWM).IStart(lineWM);
if (startMargin) {
// In RTL mode, we will only apply the start margin to the frame bounds
// after we finish flowing the frame and know more accurately whether we
// want to skip the margins.
if (lineWM.IsBidiLTR() && frameWM.IsBidiLTR()) {
pfd->mBounds.IStart(lineWM) += startMargin;
}
NS_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != aReflowState.AvailableWidth(),
"have unconstrained width; this should only result from "
"very large sizes, not attempts at intrinsic width "
"calculation");
if (NS_UNCONSTRAINEDSIZE == aReflowState.ComputedWidth()) {
// For inline-ish and text-ish things (which don't compute widths
// in the reflow state), adjust available width to account for the
// start margin. The end margin will be accounted for when we
// finish flowing the frame.
aReflowState.AvailableWidth() -= startMargin;
}
}
}
nscoord
nsLineLayout::GetCurrentFrameInlineDistanceFromBlock()
{
PerSpanData* psd;
nscoord x = 0;
for (psd = mCurrentSpan; psd; psd = psd->mParent) {
x += psd->mICoord;
}
return x;
}
/**
* 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,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus,
bool* aOptionalBreakAfterFits)
{
NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data");
WritingMode frameWM = pfd->mFrame->GetWritingMode();
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?)
*/
if (pfd->mFrame->GetPrevContinuation() ||
pfd->mFrame->FrameIsNonFirstInIBSplit()) {
pfd->mMargin.IStart(frameWM) = 0;
}
if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) ||
pfd->mFrame->LastInFlow()->GetNextContinuation() ||
pfd->mFrame->FrameIsNonLastInIBSplit())
&& !pfd->GetFlag(PFD_ISLETTERFRAME)) {
pfd->mMargin.IEnd(frameWM) = 0;
}
LogicalMargin usedMargins = pfd->mMargin.ConvertTo(lineWM, frameWM);
nscoord startMargin = usedMargins.IStart(lineWM);
nscoord endMargin = usedMargins.IEnd(lineWM);
if (!(lineWM.IsBidiLTR() && frameWM.IsBidiLTR())) {
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 (nullptr != psd->mFrame) {
nsFrame::ListTag(stdout, psd->mFrame->mFrame);
}
else {
nsFrame::ListTag(stdout, mBlockReflowState->frame);
}
printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
nsFrame::ListTag(stdout, pfd->mFrame);
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) - mTrimmableWidth + 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;
}
#ifdef FIX_BUG_50257
// another special case: always place a BR
if (nsGkAtoms::brFrame == pfd->mFrame->GetType()) {
#ifdef NOISY_CAN_PLACE_FRAME
printf(" ==> BR frame fits\n");
#endif
return true;
}
#endif
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 = NS_INLINE_LINE_BREAK_BEFORE();
return false;
}
/**
* Place the frame. Update running counters.
*/
void
nsLineLayout::PlaceFrame(PerFrameData* pfd, nsHTMLReflowMetrics& aMetrics)
{
// Record ascent and update max-ascent and max-descent values
if (aMetrics.TopAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
pfd->mAscent = pfd->mFrame->GetBaseline();
else
pfd->mAscent = aMetrics.TopAscent();
// Advance to next inline coordinate
WritingMode frameWM = pfd->mFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
mCurrentSpan->mICoord = pfd->mBounds.IEnd(lineWM) +
pfd->mMargin.ConvertTo(lineWM, frameWM).IEnd(lineWM);
// Count the number of non-placeholder frames on the line...
if (pfd->mFrame->GetType() == nsGkAtoms::placeholderFrame) {
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::AddBulletFrame(nsIFrame* aFrame,
const nsHTMLReflowMetrics& aMetrics)
{
NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
NS_ASSERTION(mGotLineBox, "must have line box");
nsIFrame *blockFrame = mBlockReflowState->frame;
NS_ASSERTION(blockFrame->IsFrameOfType(nsIFrame::eBlockFrame),
"must be for block");
if (!static_cast<nsBlockFrame*>(blockFrame)->BulletIsEmpty()) {
mHasBullet = true;
mLineBox->SetHasBullet();
}
PerFrameData* pfd = NewPerFrameData(aFrame);
mRootSpan->AppendFrame(pfd);
pfd->SetFlag(PFD_ISBULLET, true);
if (aMetrics.TopAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE)
pfd->mAscent = aFrame->GetBaseline();
else
pfd->mAscent = aMetrics.TopAscent();
// Note: block-coord value will be updated during block-direction alignment
pfd->mBounds = LogicalRect(mRootSpan->mWritingMode,
aFrame->GetRect(), mContainerWidth);
pfd->mOverflowAreas = aMetrics.mOverflowAreas;
}
#ifdef DEBUG
void
nsLineLayout::DumpPerSpanData(PerSpanData* psd, int32_t aIndent)
{
nsFrame::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) {
nsFrame::IndentBy(stdout, aIndent+1);
nsFrame::ListTag(stdout, pfd->mFrame);
nsRect rect = pfd->mBounds.GetPhysicalRect(psd->mWritingMode,
mContainerWidth);
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
#define VALIGN_OTHER 0
#define VALIGN_TOP 1
#define VALIGN_BOTTOM 2
void
nsLineLayout::BlockDirAlignLine()
{
// Synthesize a PerFrameData for the block frame
PerFrameData rootPFD(mBlockReflowState->frame->GetWritingMode());
rootPFD.mFrame = mBlockReflowState->frame;
rootPFD.mAscent = 0;
mRootSpan->mFrame = &rootPFD;
// 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;
BlockDirAlignFrames(psd);
// *** Note that comments here still use the anachronistic term "line-height"
// when we really mean "size of the line in the block direction". This is
// partly for brevity and partly to retain the association with the CSS
// line-height property
//
// 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: block-start/end 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 block start/end 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 block start/end aligned
// frames we find.
// 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, mContainerWidth);
}
}
PlaceStartEndFrames(psd, -mBStartEdge, lineBSize);
// If the frame being reflowed has text decorations, we simulate the
// propagation of those decorations to a line-level element by storing the
// offset in a frame property on any child frames that are aligned in the
// block direction somewhere other than the baseline. This property is then
// used by nsTextFrame::GetTextDecorations when the same conditions are met.
if (rootPFD.mFrame->StyleContext()->HasTextDecorationLines()) {
for (const PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
const nsIFrame *const f = pfd->mFrame;
if (f->VerticalAlignEnum() != NS_STYLE_VERTICAL_ALIGN_BASELINE) {
const nscoord offset = baselineBCoord - pfd->mBounds.BStart(lineWM);
f->Properties().Set(nsIFrame::LineBaselineOffset(),
NS_INT32_TO_PTR(offset));
}
}
}
// Fill in returned line-box and max-element-width data
mLineBox->mBounds.x = psd->mIStart;
mLineBox->mBounds.y = mBStartEdge;
mLineBox->mBounds.width = psd->mICoord - psd->mIStart;
mLineBox->mBounds.height = lineBSize;
mFinalLineBSize = lineBSize;
mLineBox->SetAscent(baselineBCoord - mBStartEdge);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(
" [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n",
mLineBox->mBounds.x, mLineBox->mBounds.y,
mLineBox->mBounds.width, mLineBox->mBounds.height,
mFinalLineBSize, mLineBox->GetAscent());
#endif
// Undo root-span mFrame pointer to prevent brane damage later on...
mRootSpan->mFrame = nullptr;
}
void
nsLineLayout::PlaceStartEndFrames(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 frameWM = pfd->mFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
switch (pfd->mBlockDirAlign) {
case VALIGN_TOP:
if (span) {
pfd->mBounds.BStart(lineWM) = -aDistanceFromStart - span->mMinBCoord;
}
else {
pfd->mBounds.BStart(lineWM) =
-aDistanceFromStart + pfd->mMargin.BStart(frameWM);
}
pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
pfd->mBounds.BStart(lineWM), aDistanceFromStart,
span ? pfd->mBorderPadding.BStart(frameWM) : 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(frameWM) - pfd->mBounds.BSize(lineWM);
}
pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(": y=%d\n", pfd->mBounds.BStart(lineWM));
#endif
break;
}
if (span) {
nscoord fromStart = aDistanceFromStart + pfd->mBounds.BStart(lineWM);
PlaceStartEndFrames(span, fromStart, aLineBSize);
}
}
}
static float
GetInflationForBlockDirAlignment(nsIFrame* aFrame,
nscoord aInflationMinFontSize)
{
if (aFrame->IsSVGText()) {
const nsIFrame* container =
nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::svgTextFrame);
NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
return
static_cast<const SVGTextFrame*>(container)->GetFontSizeScaleFactor();
}
return nsLayoutUtils::FontSizeInflationInner(aFrame, aInflationMinFontSize);
}
#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. Note: this doesn't
// place block start/end aligned frames 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::BlockDirAlignFrames(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
nsRefPtr<nsFontMetrics> fm;
float inflation =
GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize);
nsLayoutUtils::GetFontMetricsForFrame(spanFrame, getter_AddRefs(fm),
inflation);
mBlockReflowState->rendContext->SetFont(fm);
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 frameWM = spanFramePFD->mFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
bool emptyContinuation = psd != mRootSpan &&
spanFrame->GetPrevInFlow() && !spanFrame->GetNextInFlow() &&
spanFramePFD->mBounds.IsZeroSize();
#ifdef NOISY_BLOCKDIR_ALIGN
printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
nsFrame::ListTag(stdout, spanFrame);
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) {
WritingMode frameWM = spanFramePFD->mFrame->GetWritingMode();
printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
spanFramePFD->mBorderPadding.Top(frameWM),
spanFramePFD->mBorderPadding.Right(frameWM),
spanFramePFD->mBorderPadding.Bottom(frameWM),
spanFramePFD->mBorderPadding.Left(frameWM),
spanFramePFD->mMargin.Top(frameWM),
spanFramePFD->mMargin.Right(frameWM),
spanFramePFD->mMargin.Bottom(frameWM),
spanFramePFD->mMargin.Left(frameWM));
}
printf("\n");
#endif
// Compute the span's mZeroEffectiveSpanBox 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.IsEmpty() &&
spanFramePFD->mMargin.IsEmpty()))) {
// 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.
// See bug 134580 and bug 155333.
zeroEffectiveSpanBox = true;
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
if (pfd->GetFlag(PFD_ISTEXTFRAME) &&
(pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME) || preMode ||
pfd->mBounds.ISize(mRootSpan->mWritingMode) != 0)) {
zeroEffectiveSpanBox = false;
break;
}
}
}
psd->mZeroEffectiveSpanBox = zeroEffectiveSpanBox;
// 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]");
nsFrame::ListTag(stdout, spanFrame);
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 = nsHTMLReflowState::
CalcLineHeight(spanFrame->StyleContext(),
mBlockReflowState->ComputedHeight(),
inflation);
nscoord contentBSize = spanFramePFD->mBounds.BSize(lineWM) -
spanFramePFD->mBorderPadding.BStart(frameWM) -
spanFramePFD->mBorderPadding.BEnd(frameWM);
// 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->GetFlag(PFD_ISLETTERFRAME) &&
!spanFrame->GetPrevInFlow() &&
spanFrame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal) {
logicalBSize = spanFramePFD->mBounds.BSize(lineWM);
}
nscoord leading = logicalBSize - contentBSize;
psd->mBStartLeading = leading / 2;
psd->mBEndLeading = leading - psd->mBStartLeading;
psd->mLogicalBSize = logicalBSize;
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(frameWM) -
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":"");
nsFrame::ListTag(stdout, spanFrame);
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(frameWM),
spanFramePFD->mBorderPadding.Bottom(frameWM),
zeroEffectiveSpanBox ? "yes" : "no");
#endif
}
nscoord maxStartBoxBSize = 0;
nscoord maxEndBoxBSize = 0;
PerFrameData* pfd = psd->mFirstFrame;
while (nullptr != pfd) {
nsIFrame* frame = pfd->mFrame;
WritingMode frameWM = frame->GetWritingMode();
// sanity check (see bug 105168, non-reproducible crashes from null frame)
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(frameWM);
if (logicalBSize < 0 &&
mPresContext->CompatibilityMode() == eCompatibility_NavQuirks) {
pfd->mAscent -= logicalBSize;
logicalBSize = 0;
}
}
// Get vertical-align property ("vertical-align" is the CSS name for
// block-direction align)
const nsStyleCoord& verticalAlign =
frame->StyleTextReset()->mVerticalAlign;
uint8_t verticalAlignEnum = frame->VerticalAlignEnum();
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [frame]");
nsFrame::ListTag(stdout, frame);
printf(": verticalAlignUnit=%d (enum == %d",
verticalAlign.GetUnit(),
((eStyleUnit_Enumerated == verticalAlign.GetUnit())
? verticalAlign.GetIntValue()
: -1));
if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
printf(", after SVG dominant-baseline conversion == %d",
verticalAlignEnum);
}
printf(")\n");
#endif
if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
switch (verticalAlignEnum) {
default:
case NS_STYLE_VERTICAL_ALIGN_BASELINE:
{
// The element's baseline is aligned with the baseline of
// the parent.
pfd->mBounds.BStart(lineWM) = baselineBCoord - pfd->mAscent;
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_SUB:
{
// Lower the baseline of the box to the subscript offset
// of the parent's box. This is identical to the baseline
// alignment except for the addition of the subscript
// offset to the baseline BCoord.
nscoord parentSubscript = fm->SubscriptOffset();
nscoord revisedBaselineBCoord = baselineBCoord + parentSubscript;
pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_SUPER:
{
// Raise the baseline of the box to the superscript offset
// of the parent's box. This is identical to the baseline
// alignment except for the subtraction of the superscript
// offset to the baseline BCoord.
nscoord parentSuperscript = fm->SuperscriptOffset();
nscoord revisedBaselineBCoord = baselineBCoord - parentSuperscript;
pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_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 NS_STYLE_VERTICAL_ALIGN_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 NS_STYLE_VERTICAL_ALIGN_MIDDLE:
{
// Align the midpoint of the frame with 1/2 the parents
// x-height above the baseline.
nscoord parentXHeight = 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(frameWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
{
// The top of the logical box is aligned with the top of
// the parent element's text.
nscoord parentAscent = fm->MaxAscent();
if (frameSpan) {
pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent -
pfd->mBorderPadding.BStart(frameWM) + frameSpan->mBStartLeading;
}
else {
pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent +
pfd->mMargin.BStart(frameWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
{
// The bottom of the logical box is aligned with the
// bottom of the parent elements text.
nscoord parentDescent = fm->MaxDescent();
if (frameSpan) {
pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent -
pfd->mBounds.BStart(lineWM) +
pfd->mBorderPadding.BEnd(frameWM) -
frameSpan->mBEndLeading;
}
else {
pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent -
pfd->mBounds.BSize(lineWM) -
pfd->mMargin.BEnd(frameWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE:
{
// 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(frameWM);
}
pfd->mBlockDirAlign = VALIGN_OTHER;
break;
}
}
} else {
// We have either a coord, a percent, or a calc().
nscoord pctBasis = 0;
if (verticalAlign.HasPercent()) {
// Percentages are like lengths, except treated as a percentage
// of the elements line block size value.
float inflation =
GetInflationForBlockDirAlignment(frame, mInflationMinFontSize);
pctBasis = nsHTMLReflowState::CalcLineHeight(
frame->StyleContext(), mBlockReflowState->ComputedBSize(),
inflation);
}
nscoord offset =
nsRuleNode::ComputeCoordPercentCalc(verticalAlign, pctBasis);
// 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.
nscoord revisedBaselineBCoord = baselineBCoord - offset;
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 and bullets 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
// and layout is using dynamic font heights (bug 20394)
// -- Note #1: With this code enabled and with the fact that we are not
// using Em[Ascent|Descent] as nsDimensions for text metrics in
// GFX mean that the discussion in bug 13072 cannot 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 = !pfd->GetFlag(PFD_ISTEXTFRAME);
if ((!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) ||
(canUpdate && (pfd->GetFlag(PFD_ISBULLET) ||
nsGkAtoms::bulletFrame == frame->GetType()))) {
// Only consider bullet / non-empty text frames when line-height:normal.
canUpdate =
frame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal;
}
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(frameWM);
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 (nsGkAtoms::brFrame == frame->GetType()) {
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(frameWM),
pfd->mBorderPadding.Bottom(frameWM),
logicalBSize,
frameSpan ? frameSpan->mBStartLeading : 0,
pfd->mBounds.BStart(lineWM), minBCoord, maxBCoord);
#endif
}
if (psd != mRootSpan) {
frame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
}
}
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
// mZeroEffectiveSpanBox 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 mZeroEffectiveSpanBox
// (2) if this line has a bullet
// (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 = !psd->mZeroEffectiveSpanBox || mHasBullet;
bool isLastLine = (!mLineBox->IsLineWrapped() && !mLineEndsInBR);
if (!applyMinLH && isLastLine) {
nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
if (blockContent) {
nsIAtom *blockTagAtom = blockContent->Tag();
// (3) above, if the last line of LI, DT, or DD
if (blockTagAtom == nsGkAtoms::li ||
blockTagAtom == nsGkAtoms::dt ||
blockTagAtom == nsGkAtoms::dd) {
applyMinLH = true;
}
}
}
if (applyMinLH) {
if (psd->mHasNonemptyContent || preMode || mHasBullet) {
#ifdef NOISY_BLOCKDIR_ALIGN
printf(" [span]==> adjusting min/maxBCoord: currentValues: %d,%d", minBCoord, maxBCoord);
#endif
nscoord minimumLineBSize = mMinLineBSize;
nscoord blockStart =
-nsLayoutUtils::GetCenteredFontBaseline(fm, minimumLineBSize);
nscoord blockEnd = blockStart + minimumLineBSize;
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) && (psd->mZeroEffectiveSpanBox)) {
#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(frameWM),
spanFramePFD->mAscent,
psd->mLogicalBSize, psd->mBStartLeading, psd->mBEndLeading);
#endif
nscoord goodMinBCoord = spanFramePFD->mBorderPadding.BStart(frameWM) -
psd->mBStartLeading;
nscoord goodMaxBCoord = goodMinBCoord + psd->mLogicalBSize;
// For cases like the one in bug 714519 (text-decoration placement
// 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 crazy, 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, mContainerWidth);
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
nsFrame::ListTag(stdout, (psd == mRootSpan
? mBlockReflowState->frame
: psd->mFrame->mFrame));
printf(": attempting trim of ");
nsFrame::ListTag(stdout, pfd->mFrame);
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 BlockDirAlignFrames method
// will be run after this method.
nsIFrame* f = pfd->mFrame;
LogicalRect r(lineWM, f->GetRect(), mContainerWidth);
r.ISize(lineWM) -= deltaISize;
f->SetRect(lineWM, r, mContainerWidth);
}
// 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 BlockDirAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, deltaISize);
}
}
}
return true;
}
}
else if (!pfd->GetFlag(PFD_ISTEXTFRAME) &&
!pfd->GetFlag(PFD_SKIPWHENTRIMMINGWHITESPACE)) {
// 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->GetFlag(PFD_ISTEXTFRAME)) {
// 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(mBlockReflowState->rendContext);
#ifdef NOISY_TRIM
nsFrame::ListTag(stdout, (psd == mRootSpan
? mBlockReflowState->frame
: psd->mFrame->mFrame));
printf(": trim of ");
nsFrame::ListTag(stdout, pfd->mFrame);
printf(" returned %d\n", trimOutput.mDeltaWidth);
#endif
if (trimOutput.mLastCharIsJustifiable && pfd->mJustificationNumSpaces > 0) {
pfd->mJustificationNumSpaces--;
}
if (trimOutput.mChanged) {
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true);
}
if (trimOutput.mDeltaWidth) {
pfd->mBounds.ISize(lineWM) -= trimOutput.mDeltaWidth;
// 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, mContainerWidth);
}
// 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 BlockDirAlignFrames method
// will be run after this method.
SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth);
}
}
}
if (pfd->GetFlag(PFD_ISNONEMPTYTEXTFRAME) || 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;
}
void
nsLineLayout::ComputeJustificationWeights(PerSpanData* aPSD,
int32_t* aNumSpaces,
int32_t* aNumLetters)
{
NS_ASSERTION(aPSD, "null arg");
NS_ASSERTION(aNumSpaces, "null arg");
NS_ASSERTION(aNumLetters, "null arg");
int32_t numSpaces = 0;
int32_t numLetters = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) {
if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) {
numSpaces += pfd->mJustificationNumSpaces;
numLetters += pfd->mJustificationNumLetters;
}
else if (pfd->mSpan != nullptr) {
int32_t spanSpaces;
int32_t spanLetters;
ComputeJustificationWeights(pfd->mSpan, &spanSpaces, &spanLetters);
numSpaces += spanSpaces;
numLetters += spanLetters;
}
}
*aNumSpaces = numSpaces;
*aNumLetters = numLetters;
}
nscoord
nsLineLayout::ApplyFrameJustification(PerSpanData* aPSD, FrameJustificationState* aState)
{
NS_ASSERTION(aPSD, "null arg");
NS_ASSERTION(aState, "null arg");
nscoord deltaICoord = 0;
for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) {
// Don't reposition bullets (and other frames that occur out of X-order?)
if (!pfd->GetFlag(PFD_ISBULLET)) {
nscoord dw = 0;
WritingMode lineWM = aPSD->mWritingMode;
pfd->mBounds.IStart(lineWM) += deltaICoord;
if (true == pfd->GetFlag(PFD_ISTEXTFRAME)) {
if (aState->mTotalWidthForSpaces > 0 &&
aState->mTotalNumSpaces > 0) {
aState->mNumSpacesProcessed += pfd->mJustificationNumSpaces;
nscoord newAllocatedWidthForSpaces =
(aState->mTotalWidthForSpaces*aState->mNumSpacesProcessed)
/aState->mTotalNumSpaces;
dw += newAllocatedWidthForSpaces - aState->mWidthForSpacesProcessed;
aState->mWidthForSpacesProcessed = newAllocatedWidthForSpaces;
}
if (aState->mTotalWidthForLetters > 0 &&
aState->mTotalNumLetters > 0) {
aState->mNumLettersProcessed += pfd->mJustificationNumLetters;
nscoord newAllocatedWidthForLetters =
(aState->mTotalWidthForLetters*aState->mNumLettersProcessed)
/aState->mTotalNumLetters;
dw += newAllocatedWidthForLetters - aState->mWidthForLettersProcessed;
aState->mWidthForLettersProcessed = newAllocatedWidthForLetters;
}
if (dw) {
pfd->SetFlag(PFD_RECOMPUTEOVERFLOW, true);
}
}
else {
if (nullptr != pfd->mSpan) {
dw += ApplyFrameJustification(pfd->mSpan, aState);
}
}
pfd->mBounds.ISize(lineWM) += dw;
deltaICoord += dw;
pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
}
}
return deltaICoord;
}
void
nsLineLayout::InlineDirAlignFrames(nsRect& aLineBounds,
bool aIsLastLine,
int32_t aFrameCount)
{
/**
* 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;
NS_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 availWidth = psd->mIEnd - psd->mIStart;
nscoord remainingWidth = availWidth - aLineBounds.width;
#ifdef NOISY_INLINEDIR_ALIGN
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": availWidth=%d lineBounds.x=%d lineWidth=%d delta=%d\n",
availWidth, aLineBounds.x, aLineBounds.width, remainingWidth);
#endif
WritingMode lineWM = psd->mWritingMode;
// 'text-align-last: auto' is equivalent to the value of the 'text-align'
// property except when 'text-align' is set to 'justify', in which case it
// is 'justify' when 'text-justify' is 'distribute' and 'start' otherwise.
//
// XXX: the code below will have to change when we implement text-justify
//
nscoord dx = 0;
uint8_t textAlign = mStyleText->mTextAlign;
bool textAlignTrue = mStyleText->mTextAlignTrue;
if (aIsLastLine) {
textAlignTrue = mStyleText->mTextAlignLastTrue;
if (mStyleText->mTextAlignLast == NS_STYLE_TEXT_ALIGN_AUTO) {
if (textAlign == NS_STYLE_TEXT_ALIGN_JUSTIFY) {
textAlign = NS_STYLE_TEXT_ALIGN_DEFAULT;
}
} else {
textAlign = mStyleText->mTextAlignLast;
}
}
if ((remainingWidth > 0 || textAlignTrue) &&
!(mBlockReflowState->frame->IsSVGText())) {
switch (textAlign) {
case NS_STYLE_TEXT_ALIGN_JUSTIFY:
int32_t numSpaces;
int32_t numLetters;
ComputeJustificationWeights(psd, &numSpaces, &numLetters);
if (numSpaces > 0) {
FrameJustificationState state =
{ numSpaces, numLetters, remainingWidth, 0, 0, 0, 0, 0 };
// Apply the justification, and make sure to update our linebox
// width to account for it.
aLineBounds.width += ApplyFrameJustification(psd, &state);
remainingWidth = availWidth - aLineBounds.width;
break;
}
// Fall through to the default case if we could not justify to fill
// the space.
case NS_STYLE_TEXT_ALIGN_DEFAULT:
// default alignment is to start edge so do nothing
break;
case NS_STYLE_TEXT_ALIGN_LEFT:
case NS_STYLE_TEXT_ALIGN_MOZ_LEFT:
if (!lineWM.IsBidiLTR()) {
dx = remainingWidth;
}
break;
case NS_STYLE_TEXT_ALIGN_RIGHT:
case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
if (lineWM.IsBidiLTR()) {
dx = remainingWidth;
}
break;
case NS_STYLE_TEXT_ALIGN_END:
dx = remainingWidth;
break;
case NS_STYLE_TEXT_ALIGN_CENTER:
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
dx = remainingWidth / 2;
break;
}
}
if (dx) {
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
pfd->mBounds.IStart(lineWM) += dx;
pfd->mFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
}
aLineBounds.x += dx;
}
if (mPresContext->BidiEnabled() &&
(!mPresContext->IsVisualMode() || !lineWM.IsBidiLTR())) {
nsBidiPresUtils::ReorderFrames(psd->mFirstFrame->mFrame, aFrameCount,
lineWM, mContainerWidth);
}
}
void
nsLineLayout::RelativePositionFrames(nsOverflowAreas& aOverflowAreas)
{
RelativePositionFrames(mRootSpan, aOverflowAreas);
}
void
nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsOverflowAreas& aOverflowAreas)
{
nsOverflowAreas overflowAreas;
WritingMode wm = psd->mWritingMode;
if (nullptr != psd->mFrame) {
// The span's overflow areas come in three parts:
// -- this frame's width and height
// -- pfd->mOverflowAreas, which is the area of a bullet 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.VisualOverflow().UnionRect(
psd->mFrame->mOverflowAreas.VisualOverflow(), 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 BlockDirAlignFrames)
overflowAreas.VisualOverflow() = rect.GetPhysicalRect(wm, mContainerWidth);
overflowAreas.ScrollableOverflow() = overflowAreas.VisualOverflow();
}
for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
nsIFrame* frame = pfd->mFrame;
nsPoint origin = frame->GetPosition();
// Adjust the origin of the frame
if (pfd->GetFlag(PFD_RELATIVEPOS)) {
//XXX temporary until ApplyRelativePositioning can handle logical offsets
nsMargin physicalOffsets =
pfd->mOffsets.GetPhysicalMargin(pfd->mFrame->GetWritingMode());
// right and bottom are handled by
// nsHTMLReflowState::ComputeRelativeOffsets
nsHTMLReflowState::ApplyRelativePositioning(pfd->mFrame,
physicalOffsets,
&origin);
frame->SetPosition(origin);
}
// 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.VisualOverflow(),
NS_FRAME_NO_SIZE_VIEW);
// 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.
nsOverflowAreas 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->GetFlag(PFD_ISTEXTFRAME)) {
// We need to recompute overflow areas in two 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 BlockDirAlignLine have finished
if (pfd->GetFlag(PFD_RECOMPUTEOVERFLOW) ||
frame->StyleContext()->HasTextDecorationLines()) {
nsTextFrame* f = static_cast<nsTextFrame*>(frame);
r = f->RecomputeOverflow(*mBlockReflowState);
}
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.VisualOverflow(),
NS_FRAME_NO_MOVE_VIEW);
overflowAreas.UnionWith(r + origin);
}
// If we just computed a spans combined area, we need to update its
// overflow rect...
if (psd->mFrame) {
PerFrameData* spanPFD = psd->mFrame;
nsIFrame* frame = spanPFD->mFrame;
frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize());
}
aOverflowAreas = overflowAreas;
}
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