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gecko-dev/layout/generic/nsLineLayout.cpp
Susanna Bowen 779f8cef59 Bug 1030993 - Basic reflow implementation for ruby frame classes. r=dbaron 
To account for spacing between bases or text boxes during reflow, the line
layout which manages the bases updates its inline direction coordinate based on
the preferred inline size for the corresponding text boxes. Next, the base is
reflowed at the correct inline coordinate. Each paired text box is then also
reflowed at the proper inline position determined by (1) the current position of
its corresponding base and (2) its own preferred width.

In computing intrinsic widths, accounting for spacing is less complicated. The
minimum intrinsic width is the width of the widest ruby column, and the
preferred intrinsic width is the sum of all the ruby column widths. Each ruby
column width is the maximum width of its base box and text boxes. These
individual widths are determined using GetPrefISize on the base and text boxes.

Ruby base container frames store a list of pointers to the ruby text container
frames in the segment they denote. This list of pointers is created in the ruby
frame reflow method before calling the reflow method for the ruby base
container. The list exists and is used only during reflow of the main ruby frame
and is cleared before returning from reflow.
2014-08-15 10:34:20 -07:00

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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 = availSpace.BStart(lineWM);
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;
}
void
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
if (mCurrentSpan == mRootSpan) {
pfd->mFrame->Properties().Remove(nsIFrame::LineBaselineOffset());
} else {
#ifdef DEBUG
bool hasLineOffset;
pfd->mFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &hasLineOffset);
NS_ASSERTION(!hasLineOffset, "LineBaselineOffset was set but was not expected");
#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 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
nsIAtom* frameType = aFrame->GetType();
bool isText = frameType == nsGkAtoms::textFrame;
// 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) {
// 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 = mBlockReflowState->ComputedSize(frameWM);
availSize.BSize(frameWM) = NS_UNCONSTRAINEDSIZE;
reflowStateHolder.emplace(mPresContext, *psd->mReflowState,
aFrame, availSize);
nsHTMLReflowState& reflowState = *reflowStateHolder;
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);
}
// 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, 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.ISize(lineWM) = nscoord(0xdeadbeef);
metrics.BSize(lineWM) = 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) {
aFrame->Reflow(mPresContext, metrics, *reflowStateHolder, aReflowStatus);
} 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.ISize(lineWM) >= 0, "bad inline size");
NS_ASSERTION(metrics.BSize(lineWM) >= 0,"bad block size");
if (metrics.ISize(lineWM) < 0) {
metrics.ISize(lineWM) = 0;
}
if (metrics.BSize(lineWM) < 0) {
metrics.BSize(lineWM) = 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.ISize(lineWM)) ||
CRAZY_SIZE(metrics.BSize(lineWM))) {
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(lineWM);
pfd->mBounds.BSize(lineWM) = metrics.BSize(lineWM);
// Size the frame, but |RelativePositionFrames| will size the view.
aFrame->SetRect(lineWM, pfd->mBounds, mContainerWidth);
// Tell the frame that we're done reflowing it
aFrame->DidReflow(mPresContext,
isText ? nullptr : reflowStateHolder.ptr(),
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)
kidNextInFlow->GetParent()->
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->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.
VerticalAlignFrames(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
}
void
nsLineLayout::AllowForStartMargin(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();
// 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()) &&
aReflowState.mStyleBorder->mBoxDecorationBreak ==
NS_STYLE_BOX_DECORATION_BREAK_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(frameWM) = 0;
} else {
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() -= pfd->mMargin.IStart(frameWM);
}
}
}
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");
*aOptionalBreakAfterFits = true;
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?)
*
* For box-decoration-break:clone we apply the end margin on all
* continuations (that are not letter frames).
*/
if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) ||
pfd->mFrame->LastInFlow()->GetNextContinuation() ||
pfd->mFrame->FrameIsNonLastInIBSplit()) &&
!pfd->GetFlag(PFD_ISLETTERFRAME) &&
pfd->mFrame->StyleBorder()->mBoxDecorationBreak ==
NS_STYLE_BOX_DECORATION_BREAK_SLICE) {
pfd->mMargin.IEnd(frameWM) = 0;
}
// Convert the frame's margins to the line's writing mode and apply
// the start margin to the frame bounds.
LogicalMargin usedMargins = pfd->mMargin.ConvertTo(lineWM, frameWM);
nscoord startMargin = usedMargins.IStart(lineWM);
nscoord endMargin = usedMargins.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 (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)
{
WritingMode frameWM = pfd->mFrame->GetWritingMode();
WritingMode lineWM = mRootSpan->mWritingMode;
// Record ascent and update max-ascent and max-descent values
if (aMetrics.BlockStartAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) {
pfd->mAscent = pfd->mFrame->GetLogicalBaseline(lineWM);
} else {
pfd->mAscent = aMetrics.BlockStartAscent();
}
// Advance to next inline coordinate
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();
}
WritingMode lineWM = mRootSpan->mWritingMode;
PerFrameData* pfd = NewPerFrameData(aFrame);
mRootSpan->AppendFrame(pfd);
pfd->SetFlag(PFD_ISBULLET, true);
if (aMetrics.BlockStartAscent() == nsHTMLReflowMetrics::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(), 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::VerticalAlignLine()
{
// 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;
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, mContainerWidth);
}
}
PlaceTopBottomFrames(psd, -mBStartEdge, lineBSize);
// Fill in returned line-box and max-element-width data
mLineBox->SetBounds(lineWM,
psd->mIStart, mBStartEdge,
psd->mICoord - psd->mIStart, lineBSize,
mContainerWidth);
mFinalLineBSize = lineBSize;
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
// Undo root-span mFrame pointer to prevent brane damage later on...
mRootSpan->mFrame = nullptr;
}
// 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 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);
PlaceTopBottomFrames(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 (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
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->GetContent(), 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.
// XXX For vertical text we will need a new API to get the logical
// max-ascent here
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.BSize(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->GetContent(),
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 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.
#if 0
if (!pfd->GetFlag(PFD_ISTEXTFRAME)) {
#else
// Only consider non empty text frames when line-height=normal
bool canUpdate = !pfd->GetFlag(PFD_ISTEXTFRAME);
if (!canUpdate && pfd->GetFlag(PFD_ISNONWHITESPACETEXTFRAME)) {
canUpdate =
frame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal;
}
if (canUpdate) {
#endif
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 VerticalAlignFrames 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 VerticalAlignFrames 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 VerticalAlignFrames 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 = mRootSpan->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;
}
// 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;
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 availISize = psd->mIEnd - psd->mIStart;
nscoord remainingISize = availISize - aLine->ISize();
#ifdef NOISY_INLINEDIR_ALIGN
nsFrame::ListTag(stdout, mBlockReflowState->frame);
printf(": availISize=%d lineBounds.IStart=%d lineISize=%d delta=%d\n",
availISize, aLine->IStart(), aLine->ISize(), remainingISize);
#endif
// '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 ((remainingISize > 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, remainingISize, 0, 0, 0, 0, 0 };
// Apply the justification, and make sure to update our linebox
// width to account for it.
aLine->ExpandBy(ApplyFrameJustification(psd, &state),
mContainerWidth);
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 = remainingISize;
}
break;
case NS_STYLE_TEXT_ALIGN_RIGHT:
case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
if (lineWM.IsBidiLTR()) {
dx = remainingISize;
}
break;
case NS_STYLE_TEXT_ALIGN_END:
dx = remainingISize;
break;
case NS_STYLE_TEXT_ALIGN_CENTER:
case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
dx = remainingISize / 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);
}
aLine->IndentBy(dx, mContainerWidth);
}
if (mPresContext->BidiEnabled() &&
(!mPresContext->IsVisualMode() || !lineWM.IsBidiLTR())) {
nsBidiPresUtils::ReorderFrames(psd->mFirstFrame->mFrame,
aLine->GetChildCount(),
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 VerticalAlignFrames)
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 VerticalAlignLine 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;
}
void
nsLineLayout::AdvanceICoord(nscoord aAmount)
{
mCurrentSpan->mICoord += aAmount;
}
WritingMode
nsLineLayout::GetWritingMode()
{
return mRootSpan->mWritingMode;
}
nscoord
nsLineLayout::GetCurrentICoord()
{
return mCurrentSpan->mICoord;
}
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