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webkit / WebKit / 22545813f5036759325ce88b3533d3a2d39136fd / . / Source / WebCore / rendering / RenderBlockLineLayout.cpp
blob: dd78ef15647a83bf1102559a5057f369e086efa0 [file] [log] [blame]
/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 ChangSeok Oh <shivamidow@gmail.com>
* Copyright (C) 2013 Adobe Systems Inc. All right reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "AXObjectCache.h"
#include "BidiResolver.h"
#include "BreakingContextInlineHeaders.h"
#include "FloatingObjects.h"
#include "InlineElementBox.h"
#include "InlineIterator.h"
#include "InlineTextBox.h"
#include "LineLayoutState.h"
#include "Logging.h"
#include "RenderBlockFlow.h"
#include "RenderFlowThread.h"
#include "RenderLineBreak.h"
#include "RenderRegion.h"
#include "RenderView.h"
#include "Settings.h"
#include "SimpleLineLayoutFunctions.h"
#include "TrailingFloatsRootInlineBox.h"
#include "VerticalPositionCache.h"
#include <wtf/RefCountedLeakCounter.h>
#include <wtf/StdLibExtras.h>
#if ENABLE(SVG)
#include "SVGRootInlineBox.h"
#endif
namespace WebCore {
static void determineDirectionality(TextDirection& dir, InlineIterator iter)
{
while (!iter.atEnd()) {
if (iter.atParagraphSeparator())
return;
if (UChar current = iter.current()) {
UCharDirection charDirection = u_charDirection(current);
if (charDirection == U_LEFT_TO_RIGHT) {
dir = LTR;
return;
}
if (charDirection == U_RIGHT_TO_LEFT || charDirection == U_RIGHT_TO_LEFT_ARABIC) {
dir = RTL;
return;
}
}
iter.increment();
}
}
inline BidiRun* createRun(int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
{
ASSERT(obj);
return new BidiRun(start, end, *obj, resolver.context(), resolver.dir());
}
void RenderBlockFlow::appendRunsForObject(BidiRunList<BidiRun>& runs, int start, int end, RenderObject* obj, InlineBidiResolver& resolver)
{
if (start > end || shouldSkipCreatingRunsForObject(obj))
return;
LineMidpointState& lineMidpointState = resolver.midpointState();
bool haveNextMidpoint = (lineMidpointState.currentMidpoint < lineMidpointState.numMidpoints);
InlineIterator nextMidpoint;
if (haveNextMidpoint)
nextMidpoint = lineMidpointState.midpoints[lineMidpointState.currentMidpoint];
if (lineMidpointState.betweenMidpoints) {
if (!(haveNextMidpoint && nextMidpoint.renderer() == obj))
return;
// This is a new start point. Stop ignoring objects and
// adjust our start.
lineMidpointState.betweenMidpoints = false;
start = nextMidpoint.offset();
lineMidpointState.currentMidpoint++;
if (start < end)
return appendRunsForObject(runs, start, end, obj, resolver);
} else {
if (!haveNextMidpoint || (obj != nextMidpoint.renderer())) {
runs.addRun(createRun(start, end, obj, resolver));
return;
}
// An end midpoint has been encountered within our object. We
// need to go ahead and append a run with our endpoint.
if (static_cast<int>(nextMidpoint.offset() + 1) <= end) {
lineMidpointState.betweenMidpoints = true;
lineMidpointState.currentMidpoint++;
if (nextMidpoint.offset() != UINT_MAX) { // UINT_MAX means stop at the object and don't include any of it.
if (static_cast<int>(nextMidpoint.offset() + 1) > start)
runs.addRun(createRun(start, nextMidpoint.offset() + 1, obj, resolver));
return appendRunsForObject(runs, nextMidpoint.offset() + 1, end, obj, resolver);
}
} else
runs.addRun(createRun(start, end, obj, resolver));
}
}
std::unique_ptr<RootInlineBox> RenderBlockFlow::createRootInlineBox()
{
return std::make_unique<RootInlineBox>(*this);
}
RootInlineBox* RenderBlockFlow::createAndAppendRootInlineBox()
{
auto newRootBox = createRootInlineBox();
RootInlineBox* rootBox = newRootBox.get();
m_lineBoxes.appendLineBox(std::move(newRootBox));
if (UNLIKELY(AXObjectCache::accessibilityEnabled()) && firstRootBox() == rootBox) {
if (AXObjectCache* cache = document().existingAXObjectCache())
cache->recomputeIsIgnored(this);
}
return rootBox;
}
static inline InlineBox* createInlineBoxForRenderer(RenderObject* obj, bool isRootLineBox, bool isOnlyRun = false)
{
if (isRootLineBox)
return toRenderBlockFlow(obj)->createAndAppendRootInlineBox();
if (obj->isText())
return toRenderText(obj)->createInlineTextBox();
if (obj->isBox()) {
// FIXME: This is terrible. This branch returns an *owned* pointer!
return toRenderBox(obj)->createInlineBox().release();
}
if (obj->isLineBreak()) {
// FIXME: This is terrible. This branch returns an *owned* pointer!
auto inlineBox = toRenderLineBreak(obj)->createInlineBox().release();
// We only treat a box as text for a <br> if we are on a line by ourself or in strict mode
// (Note the use of strict mode. In "almost strict" mode, we don't treat the box for <br> as text.)
inlineBox->setBehavesLikeText(isOnlyRun || obj->document().inNoQuirksMode() || obj->isLineBreakOpportunity());
return inlineBox;
}
return toRenderInline(obj)->createAndAppendInlineFlowBox();
}
static inline void dirtyLineBoxesForRenderer(RenderObject& renderer, bool fullLayout)
{
if (renderer.isText()) {
RenderText& renderText = toRenderText(renderer);
updateCounterIfNeeded(renderText);
renderText.dirtyLineBoxes(fullLayout);
} else if (renderer.isLineBreak())
toRenderLineBreak(renderer).dirtyLineBoxes(fullLayout);
else
toRenderInline(renderer).dirtyLineBoxes(fullLayout);
}
static bool parentIsConstructedOrHaveNext(InlineFlowBox* parentBox)
{
do {
if (parentBox->isConstructed() || parentBox->nextOnLine())
return true;
parentBox = parentBox->parent();
} while (parentBox);
return false;
}
InlineFlowBox* RenderBlockFlow::createLineBoxes(RenderObject* obj, const LineInfo& lineInfo, InlineBox* childBox, bool startNewSegment)
{
// See if we have an unconstructed line box for this object that is also
// the last item on the line.
unsigned lineDepth = 1;
InlineFlowBox* parentBox = 0;
InlineFlowBox* result = 0;
bool hasDefaultLineBoxContain = style().lineBoxContain() == RenderStyle::initialLineBoxContain();
do {
ASSERT_WITH_SECURITY_IMPLICATION(obj->isRenderInline() || obj == this);
RenderInline* inlineFlow = (obj != this) ? toRenderInline(obj) : 0;
// Get the last box we made for this render object.
parentBox = inlineFlow ? inlineFlow->lastLineBox() : toRenderBlockFlow(obj)->lastRootBox();
// If this box or its ancestor is constructed then it is from a previous line, and we need
// to make a new box for our line. If this box or its ancestor is unconstructed but it has
// something following it on the line, then we know we have to make a new box
// as well. In this situation our inline has actually been split in two on
// the same line (this can happen with very fancy language mixtures).
bool constructedNewBox = false;
bool allowedToConstructNewBox = !hasDefaultLineBoxContain || !inlineFlow || inlineFlow->alwaysCreateLineBoxes();
bool mustCreateBoxesToRoot = startNewSegment && !(parentBox && parentBox->isRootInlineBox());
bool canUseExistingParentBox = parentBox && !parentIsConstructedOrHaveNext(parentBox) && !mustCreateBoxesToRoot;
if (allowedToConstructNewBox && !canUseExistingParentBox) {
// We need to make a new box for this render object. Once
// made, we need to place it at the end of the current line.
InlineBox* newBox = createInlineBoxForRenderer(obj, obj == this);
ASSERT_WITH_SECURITY_IMPLICATION(newBox->isInlineFlowBox());
parentBox = toInlineFlowBox(newBox);
parentBox->setIsFirstLine(lineInfo.isFirstLine());
parentBox->setIsHorizontal(isHorizontalWritingMode());
if (!hasDefaultLineBoxContain)
parentBox->clearDescendantsHaveSameLineHeightAndBaseline();
constructedNewBox = true;
}
if (constructedNewBox || canUseExistingParentBox) {
if (!result)
result = parentBox;
// If we have hit the block itself, then |box| represents the root
// inline box for the line, and it doesn't have to be appended to any parent
// inline.
if (childBox)
parentBox->addToLine(childBox);
if (!constructedNewBox || obj == this)
break;
childBox = parentBox;
}
// If we've exceeded our line depth, then jump straight to the root and skip all the remaining
// intermediate inline flows.
obj = (++lineDepth >= cMaxLineDepth) ? this : obj->parent();
} while (true);
return result;
}
template <typename CharacterType>
static inline bool endsWithASCIISpaces(const CharacterType* characters, unsigned pos, unsigned end)
{
while (isASCIISpace(characters[pos])) {
pos++;
if (pos >= end)
return true;
}
return false;
}
static bool reachedEndOfTextRenderer(const BidiRunList<BidiRun>& bidiRuns)
{
BidiRun* run = bidiRuns.logicallyLastRun();
if (!run)
return true;
unsigned pos = run->stop();
const RenderObject& r = run->renderer();
if (!r.isText())
return false;
const RenderText& renderText = toRenderText(r);
unsigned length = renderText.textLength();
if (pos >= length)
return true;
if (renderText.is8Bit())
return endsWithASCIISpaces(renderText.characters8(), pos, length);
return endsWithASCIISpaces(renderText.characters16(), pos, length);
}
RootInlineBox* RenderBlockFlow::constructLine(BidiRunList<BidiRun>& bidiRuns, const LineInfo& lineInfo)
{
ASSERT(bidiRuns.firstRun());
bool rootHasSelectedChildren = false;
InlineFlowBox* parentBox = 0;
int runCount = bidiRuns.runCount() - lineInfo.runsFromLeadingWhitespace();
for (BidiRun* r = bidiRuns.firstRun(); r; r = r->next()) {
// Create a box for our object.
bool isOnlyRun = (runCount == 1);
if (runCount == 2 && !r->renderer().isListMarker())
isOnlyRun = (!style().isLeftToRightDirection() ? bidiRuns.lastRun() : bidiRuns.firstRun())->renderer().isListMarker();
if (lineInfo.isEmpty())
continue;
InlineBox* box = createInlineBoxForRenderer(&r->renderer(), false, isOnlyRun);
r->setBox(*box);
if (!rootHasSelectedChildren && box->renderer().selectionState() != RenderObject::SelectionNone)
rootHasSelectedChildren = true;
// If we have no parent box yet, or if the run is not simply a sibling,
// then we need to construct inline boxes as necessary to properly enclose the
// run's inline box. Segments can only be siblings at the root level, as
// they are positioned separately.
#if ENABLE(CSS_SHAPES)
bool runStartsSegment = r->m_startsSegment;
#else
bool runStartsSegment = false;
#endif
if (!parentBox || &parentBox->renderer() != r->renderer().parent() || runStartsSegment)
// Create new inline boxes all the way back to the appropriate insertion point.
parentBox = createLineBoxes(r->renderer().parent(), lineInfo, box, runStartsSegment);
else {
// Append the inline box to this line.
parentBox->addToLine(box);
}
bool visuallyOrdered = r->renderer().style().rtlOrdering() == VisualOrder;
box->setBidiLevel(r->level());
if (box->isInlineTextBox()) {
InlineTextBox* text = toInlineTextBox(box);
text->setStart(r->m_start);
text->setLen(r->m_stop - r->m_start);
text->setDirOverride(r->dirOverride(visuallyOrdered));
if (r->m_hasHyphen)
text->setHasHyphen(true);
}
}
// We should have a root inline box. It should be unconstructed and
// be the last continuation of our line list.
ASSERT(lastRootBox() && !lastRootBox()->isConstructed());
// Set the m_selectedChildren flag on the root inline box if one of the leaf inline box
// from the bidi runs walk above has a selection state.
if (rootHasSelectedChildren)
lastRootBox()->root().setHasSelectedChildren(true);
// Set bits on our inline flow boxes that indicate which sides should
// paint borders/margins/padding. This knowledge will ultimately be used when
// we determine the horizontal positions and widths of all the inline boxes on
// the line.
bool isLogicallyLastRunWrapped = bidiRuns.logicallyLastRun()->renderer().isText() ? !reachedEndOfTextRenderer(bidiRuns) : true;
lastRootBox()->determineSpacingForFlowBoxes(lineInfo.isLastLine(), isLogicallyLastRunWrapped, &bidiRuns.logicallyLastRun()->renderer());
// Now mark the line boxes as being constructed.
lastRootBox()->setConstructed();
// Return the last line.
return lastRootBox();
}
ETextAlign RenderBlockFlow::textAlignmentForLine(bool endsWithSoftBreak) const
{
ETextAlign alignment = style().textAlign();
if (endsWithSoftBreak)
return alignment;
#if !ENABLE(CSS3_TEXT)
return (alignment == JUSTIFY) ? TASTART : alignment;
#else
if (alignment != JUSTIFY)
return alignment;
TextAlignLast alignmentLast = style().textAlignLast();
switch (alignmentLast) {
case TextAlignLastStart:
return TASTART;
case TextAlignLastEnd:
return TAEND;
case TextAlignLastLeft:
return LEFT;
case TextAlignLastRight:
return RIGHT;
case TextAlignLastCenter:
return CENTER;
case TextAlignLastJustify:
return JUSTIFY;
case TextAlignLastAuto:
if (style().textJustify() == TextJustifyDistribute)
return JUSTIFY;
return TASTART;
}
return alignment;
#endif
}
static void updateLogicalWidthForLeftAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
{
// The direction of the block should determine what happens with wide lines.
// In particular with RTL blocks, wide lines should still spill out to the left.
if (isLeftToRightDirection) {
if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
trailingSpaceRun->box()->setLogicalWidth(std::max<float>(0, trailingSpaceRun->box()->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
return;
}
if (trailingSpaceRun)
trailingSpaceRun->box()->setLogicalWidth(0);
else if (totalLogicalWidth > availableLogicalWidth)
logicalLeft -= (totalLogicalWidth - availableLogicalWidth);
}
static void updateLogicalWidthForRightAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
{
// Wide lines spill out of the block based off direction.
// So even if text-align is right, if direction is LTR, wide lines should overflow out of the right
// side of the block.
if (isLeftToRightDirection) {
if (trailingSpaceRun) {
totalLogicalWidth -= trailingSpaceRun->box()->logicalWidth();
trailingSpaceRun->box()->setLogicalWidth(0);
}
if (totalLogicalWidth < availableLogicalWidth)
logicalLeft += availableLogicalWidth - totalLogicalWidth;
return;
}
if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun) {
trailingSpaceRun->box()->setLogicalWidth(std::max<float>(0, trailingSpaceRun->box()->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
totalLogicalWidth -= trailingSpaceRun->box()->logicalWidth();
} else
logicalLeft += availableLogicalWidth - totalLogicalWidth;
}
static void updateLogicalWidthForCenterAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
{
float trailingSpaceWidth = 0;
if (trailingSpaceRun) {
totalLogicalWidth -= trailingSpaceRun->box()->logicalWidth();
trailingSpaceWidth = std::min(trailingSpaceRun->box()->logicalWidth(), (availableLogicalWidth - totalLogicalWidth + 1) / 2);
trailingSpaceRun->box()->setLogicalWidth(std::max<float>(0, trailingSpaceWidth));
}
if (isLeftToRightDirection)
logicalLeft += std::max<float>((availableLogicalWidth - totalLogicalWidth) / 2, 0);
else
logicalLeft += totalLogicalWidth > availableLogicalWidth ? (availableLogicalWidth - totalLogicalWidth) : (availableLogicalWidth - totalLogicalWidth) / 2 - trailingSpaceWidth;
}
void RenderBlockFlow::setMarginsForRubyRun(BidiRun* run, RenderRubyRun& renderer, RenderObject* previousObject, const LineInfo& lineInfo)
{
int startOverhang;
int endOverhang;
RenderObject* nextObject = 0;
for (BidiRun* runWithNextObject = run->next(); runWithNextObject; runWithNextObject = runWithNextObject->next()) {
if (!runWithNextObject->renderer().isOutOfFlowPositioned() && !runWithNextObject->box()->isLineBreak()) {
nextObject = &runWithNextObject->renderer();
break;
}
}
renderer.getOverhang(lineInfo.isFirstLine(), renderer.style().isLeftToRightDirection() ? previousObject : nextObject, renderer.style().isLeftToRightDirection() ? nextObject : previousObject, startOverhang, endOverhang);
setMarginStartForChild(renderer, -startOverhang);
setMarginEndForChild(renderer, -endOverhang);
}
static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* run, RenderText* renderer, float xPos, const LineInfo& lineInfo,
GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
{
HashSet<const SimpleFontData*> fallbackFonts;
GlyphOverflow glyphOverflow;
const Font& font = lineStyle(*renderer->parent(), lineInfo).font();
// Always compute glyph overflow if the block's line-box-contain value is "glyphs".
if (lineBox->fitsToGlyphs()) {
// If we don't stick out of the root line's font box, then don't bother computing our glyph overflow. This optimization
// will keep us from computing glyph bounds in nearly all cases.
bool includeRootLine = lineBox->includesRootLineBoxFontOrLeading();
int baselineShift = lineBox->verticalPositionForBox(run->box(), verticalPositionCache);
int rootDescent = includeRootLine ? font.fontMetrics().descent() : 0;
int rootAscent = includeRootLine ? font.fontMetrics().ascent() : 0;
int boxAscent = font.fontMetrics().ascent() - baselineShift;
int boxDescent = font.fontMetrics().descent() + baselineShift;
if (boxAscent > rootDescent || boxDescent > rootAscent)
glyphOverflow.computeBounds = true;
}
LayoutUnit hyphenWidth = 0;
if (toInlineTextBox(run->box())->hasHyphen())
hyphenWidth = measureHyphenWidth(renderer, font, &fallbackFonts);
float measuredWidth = 0;
bool kerningIsEnabled = font.typesettingFeatures() & Kerning;
bool canUseSimpleFontCodePath = renderer->canUseSimpleFontCodePath();
// Since we don't cache glyph overflows, we need to re-measure the run if
// the style is linebox-contain: glyph.
if (!lineBox->fitsToGlyphs() && canUseSimpleFontCodePath) {
int lastEndOffset = run->m_start;
for (size_t i = 0, size = wordMeasurements.size(); i < size && lastEndOffset < run->m_stop; ++i) {
WordMeasurement& wordMeasurement = wordMeasurements[i];
if (wordMeasurement.width <= 0 || wordMeasurement.startOffset == wordMeasurement.endOffset)
continue;
if (wordMeasurement.renderer != renderer || wordMeasurement.startOffset != lastEndOffset || wordMeasurement.endOffset > run->m_stop)
continue;
lastEndOffset = wordMeasurement.endOffset;
if (kerningIsEnabled && lastEndOffset == run->m_stop) {
int wordLength = lastEndOffset - wordMeasurement.startOffset;
GlyphOverflow overflow;
measuredWidth += renderer->width(wordMeasurement.startOffset, wordLength, xPos + measuredWidth, lineInfo.isFirstLine(),
&wordMeasurement.fallbackFonts, &overflow);
UChar c = renderer->characterAt(wordMeasurement.startOffset);
if (i > 0 && wordLength == 1 && (c == ' ' || c == '\t'))
measuredWidth += renderer->style().font().wordSpacing();
} else
measuredWidth += wordMeasurement.width;
if (!wordMeasurement.fallbackFonts.isEmpty()) {
HashSet<const SimpleFontData*>::const_iterator end = wordMeasurement.fallbackFonts.end();
for (HashSet<const SimpleFontData*>::const_iterator it = wordMeasurement.fallbackFonts.begin(); it != end; ++it)
fallbackFonts.add(*it);
}
}
if (measuredWidth && lastEndOffset != run->m_stop) {
// If we don't have enough cached data, we'll measure the run again.
measuredWidth = 0;
fallbackFonts.clear();
}
}
if (!measuredWidth)
measuredWidth = renderer->width(run->m_start, run->m_stop - run->m_start, xPos, lineInfo.isFirstLine(), &fallbackFonts, &glyphOverflow);
run->box()->setLogicalWidth(measuredWidth + hyphenWidth);
if (!fallbackFonts.isEmpty()) {
ASSERT(run->box()->behavesLikeText());
GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(toInlineTextBox(run->box()), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
ASSERT(it->value.first.isEmpty());
copyToVector(fallbackFonts, it->value.first);
run->box()->parent()->clearDescendantsHaveSameLineHeightAndBaseline();
}
if ((glyphOverflow.top || glyphOverflow.bottom || glyphOverflow.left || glyphOverflow.right)) {
ASSERT(run->box()->behavesLikeText());
GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.add(toInlineTextBox(run->box()), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).iterator;
it->value.second = glyphOverflow;
run->box()->clearKnownToHaveNoOverflow();
}
}
static inline void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, float& totalLogicalWidth, float availableLogicalWidth)
{
if (!expansionOpportunityCount || availableLogicalWidth <= totalLogicalWidth)
return;
size_t i = 0;
for (BidiRun* r = firstRun; r; r = r->next()) {
#if ENABLE(CSS_SHAPES)
// This method is called once per segment, do not move past the current segment.
if (r->m_startsSegment)
break;
#endif
if (!r->box() || r == trailingSpaceRun)
continue;
if (r->renderer().isText()) {
unsigned opportunitiesInRun = expansionOpportunities[i++];
ASSERT(opportunitiesInRun <= expansionOpportunityCount);
// Only justify text if whitespace is collapsed.
if (r->renderer().style().collapseWhiteSpace()) {
InlineTextBox* textBox = toInlineTextBox(r->box());
int expansion = (availableLogicalWidth - totalLogicalWidth) * opportunitiesInRun / expansionOpportunityCount;
textBox->setExpansion(expansion);
totalLogicalWidth += expansion;
}
expansionOpportunityCount -= opportunitiesInRun;
if (!expansionOpportunityCount)
break;
}
}
}
void RenderBlockFlow::updateLogicalWidthForAlignment(const ETextAlign& textAlign, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float& availableLogicalWidth, int expansionOpportunityCount)
{
// Armed with the total width of the line (without justification),
// we now examine our text-align property in order to determine where to position the
// objects horizontally. The total width of the line can be increased if we end up
// justifying text.
switch (textAlign) {
case LEFT:
case WEBKIT_LEFT:
updateLogicalWidthForLeftAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
break;
case RIGHT:
case WEBKIT_RIGHT:
updateLogicalWidthForRightAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
break;
case CENTER:
case WEBKIT_CENTER:
updateLogicalWidthForCenterAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
break;
case JUSTIFY:
adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, availableLogicalWidth);
if (expansionOpportunityCount) {
if (trailingSpaceRun) {
totalLogicalWidth -= trailingSpaceRun->box()->logicalWidth();
trailingSpaceRun->box()->setLogicalWidth(0);
}
break;
}
// Fall through
case TASTART:
if (style().isLeftToRightDirection())
updateLogicalWidthForLeftAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
else
updateLogicalWidthForRightAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
break;
case TAEND:
if (style().isLeftToRightDirection())
updateLogicalWidthForRightAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
else
updateLogicalWidthForLeftAlignedBlock(style().isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
break;
}
}
static void updateLogicalInlinePositions(RenderBlockFlow& block, float& lineLogicalLeft, float& lineLogicalRight, float& availableLogicalWidth, bool firstLine, IndentTextOrNot shouldIndentText, LayoutUnit boxLogicalHeight)
{
LayoutUnit lineLogicalHeight = block.minLineHeightForReplacedRenderer(firstLine, boxLogicalHeight);
lineLogicalLeft = block.pixelSnappedLogicalLeftOffsetForLine(block.logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight);
lineLogicalRight = block.pixelSnappedLogicalRightOffsetForLine(block.logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight);
availableLogicalWidth = lineLogicalRight - lineLogicalLeft;
}
void RenderBlockFlow::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, const LineInfo& lineInfo, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
{
ETextAlign textAlign = textAlignmentForLine(!reachedEnd && !lineBox->endsWithBreak());
// CSS 2.1: "'Text-indent' only affects a line if it is the first formatted line of an element. For example, the first line of an anonymous block
// box is only affected if it is the first child of its parent element."
// CSS3 "text-indent", "-webkit-each-line" affects the first line of the block container as well as each line after a forced line break,
// but does not affect lines after a soft wrap break.
bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->firstChild() != this);
bool isAfterHardLineBreak = lineBox->prevRootBox() && lineBox->prevRootBox()->endsWithBreak();
IndentTextOrNot shouldIndentText = requiresIndent(isFirstLine, isAfterHardLineBreak, style());
float lineLogicalLeft;
float lineLogicalRight;
float availableLogicalWidth;
updateLogicalInlinePositions(*this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, 0);
bool needsWordSpacing;
#if ENABLE(CSS_SHAPES)
ShapeInsideInfo* shapeInsideInfo = layoutShapeInsideInfo();
if (shapeInsideInfo && shapeInsideInfo->hasSegments()) {
BidiRun* segmentStart = firstRun;
const SegmentList& segments = shapeInsideInfo->segments();
float logicalLeft = std::max<float>(roundToInt(segments[0].logicalLeft), lineLogicalLeft);
float logicalRight = std::min<float>(floorToInt(segments[0].logicalRight), lineLogicalRight);
float startLogicalLeft = logicalLeft;
float endLogicalRight = logicalLeft;
float minLogicalLeft = logicalLeft;
float maxLogicalRight = logicalLeft;
lineBox->beginPlacingBoxRangesInInlineDirection(logicalLeft);
for (size_t i = 0; i < segments.size(); i++) {
if (i) {
logicalLeft = std::max<float>(roundToInt(segments[i].logicalLeft), lineLogicalLeft);
logicalRight = std::min<float>(floorToInt(segments[i].logicalRight), lineLogicalRight);
}
availableLogicalWidth = logicalRight - logicalLeft;
BidiRun* newSegmentStart = computeInlineDirectionPositionsForSegment(lineBox, lineInfo, textAlign, logicalLeft, availableLogicalWidth, segmentStart, trailingSpaceRun, textBoxDataMap, verticalPositionCache, wordMeasurements);
needsWordSpacing = false;
endLogicalRight = lineBox->placeBoxRangeInInlineDirection(segmentStart->box(), newSegmentStart ? newSegmentStart->box() : 0, logicalLeft, minLogicalLeft, maxLogicalRight, needsWordSpacing, textBoxDataMap);
if (!newSegmentStart || !newSegmentStart->next())
break;
ASSERT(newSegmentStart->m_startsSegment);
// Discard the empty segment start marker bidi runs
segmentStart = newSegmentStart->next();
}
lineBox->endPlacingBoxRangesInInlineDirection(startLogicalLeft, endLogicalRight, minLogicalLeft, maxLogicalRight);
return;
}
#endif
if (firstRun && firstRun->renderer().isReplaced()) {
RenderBox& renderBox = toRenderBox(firstRun->renderer());
updateLogicalInlinePositions(*this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, renderBox.logicalHeight());
}
computeInlineDirectionPositionsForSegment(lineBox, lineInfo, textAlign, lineLogicalLeft, availableLogicalWidth, firstRun, trailingSpaceRun, textBoxDataMap, verticalPositionCache, wordMeasurements);
// The widths of all runs are now known. We can now place every inline box (and
// compute accurate widths for the inline flow boxes).
needsWordSpacing = false;
lineBox->placeBoxesInInlineDirection(lineLogicalLeft, needsWordSpacing, textBoxDataMap);
}
BidiRun* RenderBlockFlow::computeInlineDirectionPositionsForSegment(RootInlineBox* lineBox, const LineInfo& lineInfo, ETextAlign textAlign, float& logicalLeft,
float& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache,
WordMeasurements& wordMeasurements)
{
bool needsWordSpacing = false;
float totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth();
unsigned expansionOpportunityCount = 0;
bool isAfterExpansion = true;
Vector<unsigned, 16> expansionOpportunities;
RenderObject* previousObject = 0;
BidiRun* r = firstRun;
for (; r; r = r->next()) {
#if ENABLE(CSS_SHAPES)
// Once we have reached the start of the next segment, we have finished
// computing the positions for this segment's contents.
if (r->m_startsSegment)
break;
#endif
if (!r->box() || r->renderer().isOutOfFlowPositioned() || r->box()->isLineBreak())
continue; // Positioned objects are only participating to figure out their
// correct static x position. They have no effect on the width.
// Similarly, line break boxes have no effect on the width.
if (r->renderer().isText()) {
RenderText& rt = toRenderText(r->renderer());
if (textAlign == JUSTIFY && r != trailingSpaceRun) {
if (!isAfterExpansion)
toInlineTextBox(r->box())->setCanHaveLeadingExpansion(true);
unsigned opportunitiesInRun;
if (rt.is8Bit())
opportunitiesInRun = Font::expansionOpportunityCount(rt.characters8() + r->m_start, r->m_stop - r->m_start, r->box()->direction(), isAfterExpansion);
else
opportunitiesInRun = Font::expansionOpportunityCount(rt.characters16() + r->m_start, r->m_stop - r->m_start, r->box()->direction(), isAfterExpansion);
expansionOpportunities.append(opportunitiesInRun);
expansionOpportunityCount += opportunitiesInRun;
}
if (int length = rt.textLength()) {
if (!r->m_start && needsWordSpacing && isSpaceOrNewline(rt.characterAt(r->m_start)))
totalLogicalWidth += lineStyle(*rt.parent(), lineInfo).font().wordSpacing();
needsWordSpacing = !isSpaceOrNewline(rt.characterAt(r->m_stop - 1)) && r->m_stop == length;
}
setLogicalWidthForTextRun(lineBox, r, &rt, totalLogicalWidth, lineInfo, textBoxDataMap, verticalPositionCache, wordMeasurements);
} else {
isAfterExpansion = false;
if (!r->renderer().isRenderInline()) {
RenderBox& renderBox = toRenderBox(r->renderer());
if (renderBox.isRubyRun())
setMarginsForRubyRun(r, toRenderRubyRun(renderBox), previousObject, lineInfo);
r->box()->setLogicalWidth(logicalWidthForChild(renderBox));
totalLogicalWidth += marginStartForChild(renderBox) + marginEndForChild(renderBox);
}
}
totalLogicalWidth += r->box()->logicalWidth();
previousObject = &r->renderer();
}
if (isAfterExpansion && !expansionOpportunities.isEmpty()) {
expansionOpportunities.last()--;
expansionOpportunityCount--;
}
updateLogicalWidthForAlignment(textAlign, trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth, expansionOpportunityCount);
computeExpansionForJustifiedText(firstRun, trailingSpaceRun, expansionOpportunities, expansionOpportunityCount, totalLogicalWidth, availableLogicalWidth);
return r;
}
void RenderBlockFlow::computeBlockDirectionPositionsForLine(RootInlineBox* lineBox, BidiRun* firstRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
VerticalPositionCache& verticalPositionCache)
{
setLogicalHeight(lineBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache));
// Now make sure we place replaced render objects correctly.
for (BidiRun* r = firstRun; r; r = r->next()) {
ASSERT(r->box());
if (!r->box())
continue; // Skip runs with no line boxes.
InlineBox& box = *r->box();
// Align positioned boxes with the top of the line box. This is
// a reasonable approximation of an appropriate y position.
if (r->renderer().isOutOfFlowPositioned())
box.setLogicalTop(logicalHeight());
// Position is used to properly position both replaced elements and
// to update the static normal flow x/y of positioned elements.
if (r->renderer().isText())
toRenderText(r->renderer()).positionLineBox(toInlineTextBox(box));
else if (r->renderer().isBox())
toRenderBox(r->renderer()).positionLineBox(toInlineElementBox(box));
else if (r->renderer().isLineBreak())
toRenderLineBreak(r->renderer()).replaceInlineBoxWrapper(toInlineElementBox(box));
}
// Positioned objects and zero-length text nodes destroy their boxes in
// position(), which unnecessarily dirties the line.
lineBox->markDirty(false);
}
static inline bool isCollapsibleSpace(UChar character, const RenderText& renderer)
{
if (character == ' ' || character == '\t' || character == softHyphen)
return true;
if (character == '\n')
return !renderer.style().preserveNewline();
if (character == noBreakSpace)
return renderer.style().nbspMode() == SPACE;
return false;
}
template <typename CharacterType>
static inline int findFirstTrailingSpace(const RenderText& lastText, const CharacterType* characters, int start, int stop)
{
int firstSpace = stop;
while (firstSpace > start) {
UChar current = characters[firstSpace - 1];
if (!isCollapsibleSpace(current, lastText))
break;
firstSpace--;
}
return firstSpace;
}
inline BidiRun* RenderBlockFlow::handleTrailingSpaces(BidiRunList<BidiRun>& bidiRuns, BidiContext* currentContext)
{
if (!bidiRuns.runCount()
|| !bidiRuns.logicallyLastRun()->renderer().style().breakOnlyAfterWhiteSpace()
|| !bidiRuns.logicallyLastRun()->renderer().style().autoWrap())
return 0;
BidiRun* trailingSpaceRun = bidiRuns.logicallyLastRun();
const RenderObject& lastObject = trailingSpaceRun->renderer();
if (!lastObject.isText())
return 0;
const RenderText& lastText = toRenderText(lastObject);
int firstSpace;
if (lastText.is8Bit())
firstSpace = findFirstTrailingSpace(lastText, lastText.characters8(), trailingSpaceRun->start(), trailingSpaceRun->stop());
else
firstSpace = findFirstTrailingSpace(lastText, lastText.characters16(), trailingSpaceRun->start(), trailingSpaceRun->stop());
if (firstSpace == trailingSpaceRun->stop())
return 0;
TextDirection direction = style().direction();
bool shouldReorder = trailingSpaceRun != (direction == LTR ? bidiRuns.lastRun() : bidiRuns.firstRun());
if (firstSpace != trailingSpaceRun->start()) {
BidiContext* baseContext = currentContext;
while (BidiContext* parent = baseContext->parent())
baseContext = parent;
BidiRun* newTrailingRun = new BidiRun(firstSpace, trailingSpaceRun->m_stop, trailingSpaceRun->renderer(), baseContext, U_OTHER_NEUTRAL);
trailingSpaceRun->m_stop = firstSpace;
if (direction == LTR)
bidiRuns.addRun(newTrailingRun);
else
bidiRuns.prependRun(newTrailingRun);
trailingSpaceRun = newTrailingRun;
return trailingSpaceRun;
}
if (!shouldReorder)
return trailingSpaceRun;
if (direction == LTR) {
bidiRuns.moveRunToEnd(trailingSpaceRun);
trailingSpaceRun->m_level = 0;
} else {
bidiRuns.moveRunToBeginning(trailingSpaceRun);
trailingSpaceRun->m_level = 1;
}
return trailingSpaceRun;
}
void RenderBlockFlow::appendFloatingObjectToLastLine(FloatingObject* floatingObject)
{
ASSERT(!floatingObject->originatingLine());
floatingObject->setOriginatingLine(lastRootBox());
lastRootBox()->appendFloat(floatingObject->renderer());
}
// FIXME: BidiResolver should have this logic.
static inline void constructBidiRunsForSegment(InlineBidiResolver& topResolver, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& endOfRuns, VisualDirectionOverride override, bool previousLineBrokeCleanly)
{
// FIXME: We should pass a BidiRunList into createBidiRunsForLine instead
// of the resolver owning the runs.
ASSERT(&topResolver.runs() == &bidiRuns);
ASSERT(topResolver.position() != endOfRuns);
RenderObject* currentRoot = topResolver.position().root();
topResolver.createBidiRunsForLine(endOfRuns, override, previousLineBrokeCleanly);
while (!topResolver.isolatedRuns().isEmpty()) {
// It does not matter which order we resolve the runs as long as we resolve them all.
BidiRun* isolatedRun = topResolver.isolatedRuns().last();
topResolver.isolatedRuns().removeLast();
RenderObject& startObj = isolatedRun->renderer();
// Only inlines make sense with unicode-bidi: isolate (blocks are already isolated).
// FIXME: Because enterIsolate is not passed a RenderObject, we have to crawl up the
// tree to see which parent inline is the isolate. We could change enterIsolate
// to take a RenderObject and do this logic there, but that would be a layering
// violation for BidiResolver (which knows nothing about RenderObject).
RenderInline* isolatedInline = toRenderInline(containingIsolate(&startObj, currentRoot));
InlineBidiResolver isolatedResolver;
EUnicodeBidi unicodeBidi = isolatedInline->style().unicodeBidi();
TextDirection direction;
if (unicodeBidi == Plaintext)
determineDirectionality(direction, InlineIterator(isolatedInline, &isolatedRun->renderer(), 0));
else {
ASSERT(unicodeBidi == Isolate || unicodeBidi == IsolateOverride);
direction = isolatedInline->style().direction();
}
isolatedResolver.setStatus(BidiStatus(direction, isOverride(unicodeBidi)));
// FIXME: The fact that we have to construct an Iterator here
// currently prevents this code from moving into BidiResolver.
if (!bidiFirstSkippingEmptyInlines(*isolatedInline, &isolatedResolver))
continue;
// The starting position is the beginning of the first run within the isolate that was identified
// during the earlier call to createBidiRunsForLine. This can be but is not necessarily the
// first run within the isolate.
InlineIterator iter = InlineIterator(isolatedInline, &startObj, isolatedRun->m_start);
isolatedResolver.setPositionIgnoringNestedIsolates(iter);
// We stop at the next end of line; we may re-enter this isolate in the next call to constructBidiRuns().
// FIXME: What should end and previousLineBrokeCleanly be?
// rniwa says previousLineBrokeCleanly is just a WinIE hack and could always be false here?
isolatedResolver.createBidiRunsForLine(endOfRuns, NoVisualOverride, previousLineBrokeCleanly);
// Note that we do not delete the runs from the resolver.
// We're not guaranteed to get any BidiRuns in the previous step. If we don't, we allow the placeholder
// itself to be turned into an InlineBox. We can't remove it here without potentially losing track of
// the logically last run.
if (isolatedResolver.runs().runCount())
bidiRuns.replaceRunWithRuns(isolatedRun, isolatedResolver.runs());
// If we encountered any nested isolate runs, just move them
// to the top resolver's list for later processing.
if (!isolatedResolver.isolatedRuns().isEmpty()) {
topResolver.isolatedRuns().appendVector(isolatedResolver.isolatedRuns());
isolatedResolver.isolatedRuns().clear();
currentRoot = isolatedInline;
}
}
}
static inline void constructBidiRunsForLine(const RenderBlockFlow* block, InlineBidiResolver& topResolver, BidiRunList<BidiRun>& bidiRuns, const InlineIterator& endOfLine, VisualDirectionOverride override, bool previousLineBrokeCleanly)
{
#if !ENABLE(CSS_SHAPES)
UNUSED_PARAM(block);
constructBidiRunsForSegment(topResolver, bidiRuns, endOfLine, override, previousLineBrokeCleanly);
#else
ShapeInsideInfo* shapeInsideInfo = block->layoutShapeInsideInfo();
if (!shapeInsideInfo || !shapeInsideInfo->hasSegments()) {
constructBidiRunsForSegment(topResolver, bidiRuns, endOfLine, override, previousLineBrokeCleanly);
return;
}
const SegmentRangeList& segmentRanges = shapeInsideInfo->segmentRanges();
ASSERT(segmentRanges.size());
for (size_t i = 0; i < segmentRanges.size(); i++) {
LineSegmentIterator iterator = segmentRanges[i].start;
InlineIterator segmentStart(iterator.root, iterator.object, iterator.offset);
iterator = segmentRanges[i].end;
InlineIterator segmentEnd(iterator.root, iterator.object, iterator.offset);
if (i) {
ASSERT(segmentStart.renderer());
BidiRun* segmentMarker = createRun(segmentStart.offset(), segmentStart.offset(), segmentStart.renderer(), topResolver);
segmentMarker->m_startsSegment = true;
bidiRuns.addRun(segmentMarker);
// Do not collapse midpoints between segments
topResolver.midpointState().betweenMidpoints = false;
}
if (segmentStart == segmentEnd)
continue;
topResolver.setPosition(segmentStart, numberOfIsolateAncestors(segmentStart));
constructBidiRunsForSegment(topResolver, bidiRuns, segmentEnd, override, previousLineBrokeCleanly);
}
#endif
}
// This function constructs line boxes for all of the text runs in the resolver and computes their position.
RootInlineBox* RenderBlockFlow::createLineBoxesFromBidiRuns(BidiRunList<BidiRun>& bidiRuns, const InlineIterator& end, LineInfo& lineInfo, VerticalPositionCache& verticalPositionCache, BidiRun* trailingSpaceRun, WordMeasurements& wordMeasurements)
{
if (!bidiRuns.runCount())
return 0;
// FIXME: Why is this only done when we had runs?
lineInfo.setLastLine(!end.renderer());
RootInlineBox* lineBox = constructLine(bidiRuns, lineInfo);
if (!lineBox)
return 0;
lineBox->setEndsWithBreak(lineInfo.previousLineBrokeCleanly());
#if ENABLE(SVG)
bool isSVGRootInlineBox = lineBox->isSVGRootInlineBox();
#else
bool isSVGRootInlineBox = false;
#endif
GlyphOverflowAndFallbackFontsMap textBoxDataMap;
// Now we position all of our text runs horizontally.
if (!isSVGRootInlineBox)
computeInlineDirectionPositionsForLine(lineBox, lineInfo, bidiRuns.firstRun(), trailingSpaceRun, end.atEnd(), textBoxDataMap, verticalPositionCache, wordMeasurements);
// Now position our text runs vertically.
computeBlockDirectionPositionsForLine(lineBox, bidiRuns.firstRun(), textBoxDataMap, verticalPositionCache);
#if ENABLE(SVG)
// SVG text layout code computes vertical & horizontal positions on its own.
// Note that we still need to execute computeVerticalPositionsForLine() as
// it calls InlineTextBox::positionLineBox(), which tracks whether the box
// contains reversed text or not. If we wouldn't do that editing and thus
// text selection in RTL boxes would not work as expected.
if (isSVGRootInlineBox) {
ASSERT_WITH_SECURITY_IMPLICATION(isSVGText());
toSVGRootInlineBox(lineBox)->computePerCharacterLayoutInformation();
}
#endif
// Compute our overflow now.
lineBox->computeOverflow(lineBox->lineTop(), lineBox->lineBottom(), textBoxDataMap);
#if PLATFORM(MAC)
// Highlight acts as an overflow inflation.
if (style().highlight() != nullAtom)
lineBox->addHighlightOverflow();
#endif
return lineBox;
}
static void deleteLineRange(LineLayoutState& layoutState, RootInlineBox* startLine, RootInlineBox* stopLine = 0)
{
RootInlineBox* boxToDelete = startLine;
while (boxToDelete && boxToDelete != stopLine) {
layoutState.updateRepaintRangeFromBox(boxToDelete);
// Note: deleteLineRange(firstRootBox()) is not identical to deleteLineBoxTree().
// deleteLineBoxTree uses nextLineBox() instead of nextRootBox() when traversing.
RootInlineBox* next = boxToDelete->nextRootBox();
boxToDelete->deleteLine();
boxToDelete = next;
}
}
void RenderBlockFlow::layoutRunsAndFloats(LineLayoutState& layoutState, bool hasInlineChild)
{
// We want to skip ahead to the first dirty line
InlineBidiResolver resolver;
RootInlineBox* startLine = determineStartPosition(layoutState, resolver);
unsigned consecutiveHyphenatedLines = 0;
if (startLine) {
for (RootInlineBox* line = startLine->prevRootBox(); line && line->isHyphenated(); line = line->prevRootBox())
consecutiveHyphenatedLines++;
}
// FIXME: This would make more sense outside of this function, but since
// determineStartPosition can change the fullLayout flag we have to do this here. Failure to call
// determineStartPosition first will break fast/repaint/line-flow-with-floats-9.html.
if (layoutState.isFullLayout() && hasInlineChild && !selfNeedsLayout()) {
setNeedsLayout(MarkOnlyThis); // Mark as needing a full layout to force us to repaint.
if (!view().doingFullRepaint() && hasLayer()) {
// Because we waited until we were already inside layout to discover
// that the block really needed a full layout, we missed our chance to repaint the layer
// before layout started. Luckily the layer has cached the repaint rect for its original
// position and size, and so we can use that to make a repaint happen now.
repaintUsingContainer(containerForRepaint(), pixelSnappedIntRect(layer()->repaintRect()));
}
}
if (containsFloats())
layoutState.setLastFloat(m_floatingObjects->set().last().get());
// We also find the first clean line and extract these lines. We will add them back
// if we determine that we're able to synchronize after handling all our dirty lines.
InlineIterator cleanLineStart;
BidiStatus cleanLineBidiStatus;
if (!layoutState.isFullLayout() && startLine)
determineEndPosition(layoutState, startLine, cleanLineStart, cleanLineBidiStatus);
if (startLine) {
if (!layoutState.usesRepaintBounds())
layoutState.setRepaintRange(logicalHeight());
deleteLineRange(layoutState, startLine);
}
if (!layoutState.isFullLayout() && lastRootBox() && lastRootBox()->endsWithBreak()) {
// If the last line before the start line ends with a line break that clear floats,
// adjust the height accordingly.
// A line break can be either the first or the last object on a line, depending on its direction.
if (InlineBox* lastLeafChild = lastRootBox()->lastLeafChild()) {
RenderObject* lastObject = &lastLeafChild->renderer();
if (!lastObject->isBR())
lastObject = &lastRootBox()->firstLeafChild()->renderer();
if (lastObject->isBR()) {
EClear clear = lastObject->style().clear();
if (clear != CNONE)
newLine(clear);
}
}
}
layoutRunsAndFloatsInRange(layoutState, resolver, cleanLineStart, cleanLineBidiStatus, consecutiveHyphenatedLines);
linkToEndLineIfNeeded(layoutState);
repaintDirtyFloats(layoutState.floats());
}
RenderTextInfo::RenderTextInfo()
: m_text(0)
, m_font(0)
{
}
RenderTextInfo::~RenderTextInfo()
{
}
// Before restarting the layout loop with a new logicalHeight, remove all floats that were added and reset the resolver.
inline const InlineIterator& RenderBlockFlow::restartLayoutRunsAndFloatsInRange(LayoutUnit oldLogicalHeight, LayoutUnit newLogicalHeight, FloatingObject* lastFloatFromPreviousLine, InlineBidiResolver& resolver, const InlineIterator& oldEnd)
{
removeFloatingObjectsBelow(lastFloatFromPreviousLine, oldLogicalHeight);
setLogicalHeight(newLogicalHeight);
resolver.setPositionIgnoringNestedIsolates(oldEnd);
return oldEnd;
}
#if ENABLE(CSS_SHAPES)
static inline void pushShapeContentOverflowBelowTheContentBox(RenderBlockFlow* block, ShapeInsideInfo* shapeInsideInfo, LayoutUnit lineTop, LayoutUnit lineHeight)
{
ASSERT(shapeInsideInfo);
LayoutUnit logicalLineBottom = lineTop + lineHeight;
LayoutUnit shapeLogicalBottom = shapeInsideInfo->shapeLogicalBottom();
LayoutUnit shapeContainingBlockLogicalHeight = shapeInsideInfo->shapeContainingBlockLogicalHeight();
bool isOverflowPositionedAlready = (shapeContainingBlockLogicalHeight - shapeInsideInfo->owner().borderAndPaddingAfter() + lineHeight) <= lineTop;
// If the last line overlaps with the shape, we don't need the segments anymore
if (lineTop < shapeLogicalBottom && shapeLogicalBottom < logicalLineBottom)
shapeInsideInfo->clearSegments();
if (logicalLineBottom <= shapeLogicalBottom || !shapeContainingBlockLogicalHeight || isOverflowPositionedAlready)
return;
LayoutUnit newLogicalHeight = block->logicalHeight() + (shapeContainingBlockLogicalHeight - (lineTop + shapeInsideInfo->owner().borderAndPaddingAfter()));
block->setLogicalHeight(newLogicalHeight);
}
void RenderBlockFlow::updateShapeAndSegmentsForCurrentLine(ShapeInsideInfo*& shapeInsideInfo, const LayoutSize& logicalOffsetFromShapeContainer, LineLayoutState& layoutState)
{
if (layoutState.flowThread())
return updateShapeAndSegmentsForCurrentLineInFlowThread(shapeInsideInfo, layoutState);
if (!shapeInsideInfo)
return;
LayoutUnit lineTop = logicalHeight() + logicalOffsetFromShapeContainer.height();
LayoutUnit lineLeft = logicalOffsetFromShapeContainer.width();
LayoutUnit lineHeight = this->lineHeight(layoutState.lineInfo().isFirstLine(), isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
// FIXME: Bug 95361: It is possible for a line to grow beyond lineHeight, in which case these segments may be incorrect.
shapeInsideInfo->updateSegmentsForLine(LayoutSize(lineLeft, lineTop), lineHeight);
pushShapeContentOverflowBelowTheContentBox(this, shapeInsideInfo, lineTop, lineHeight);
}
void RenderBlockFlow::updateShapeAndSegmentsForCurrentLineInFlowThread(ShapeInsideInfo*& shapeInsideInfo, LineLayoutState& layoutState)
{
ASSERT(layoutState.flowThread());
RenderRegion* currentRegion = regionAtBlockOffset(logicalHeight());
if (!currentRegion || !currentRegion->logicalHeight())
return;
shapeInsideInfo = currentRegion->shapeInsideInfo();
RenderRegion* nextRegion = 0;
if (!currentRegion->isLastRegion()) {
RenderRegionList regionList = layoutState.flowThread()->renderRegionList();
auto it = regionList.find(currentRegion);
nextRegion = *(++it);
}
// We only want to deal regions with shapes, so we check if the next region has a shape
if (!shapeInsideInfo && nextRegion && !nextRegion->shapeInsideInfo())
return;
LayoutUnit lineHeight = this->lineHeight(layoutState.lineInfo().isFirstLine(), isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
LayoutUnit logicalLineTopInFlowThread = logicalHeight() + offsetFromLogicalTopOfFirstPage();
LayoutUnit logicalLineBottomInFlowThread = logicalLineTopInFlowThread + lineHeight;
LayoutUnit logicalRegionTopInFlowThread = currentRegion->logicalTopForFlowThreadContent();
LayoutUnit logicalRegionBottomInFlowThread = logicalRegionTopInFlowThread + currentRegion->logicalHeight() - currentRegion->borderAndPaddingBefore() - currentRegion->borderAndPaddingAfter();
LayoutUnit shapeBottomInFlowThread = LayoutUnit::max();
if (shapeInsideInfo)
shapeBottomInFlowThread = shapeInsideInfo->shapeLogicalBottom() + currentRegion->logicalTopForFlowThreadContent();
bool lineOverLapsWithShapeBottom = shapeBottomInFlowThread < logicalLineBottomInFlowThread;
bool lineTopAdjustedIntoNextRegion = layoutState.adjustedLogicalLineTop() >= currentRegion->logicalHeight();
bool lineOverLapsWithRegionBottom = logicalLineBottomInFlowThread > logicalRegionBottomInFlowThread || lineTopAdjustedIntoNextRegion;
bool overFlowsToNextRegion = nextRegion && (lineOverLapsWithShapeBottom || lineOverLapsWithRegionBottom);
// If the line is between two shapes/regions we position the line to the top of the next shape/region
if (overFlowsToNextRegion) {
ASSERT(currentRegion != nextRegion);
LayoutUnit deltaToNextRegion = logicalRegionBottomInFlowThread - logicalLineTopInFlowThread;
setLogicalHeight(logicalHeight() + deltaToNextRegion);
currentRegion = nextRegion;
shapeInsideInfo = currentRegion->shapeInsideInfo();
logicalLineTopInFlowThread = logicalHeight() + offsetFromLogicalTopOfFirstPage();
logicalLineBottomInFlowThread = logicalLineTopInFlowThread + lineHeight;
logicalRegionTopInFlowThread = currentRegion->logicalTopForFlowThreadContent();
logicalRegionBottomInFlowThread = logicalRegionTopInFlowThread + currentRegion->logicalHeight() - currentRegion->borderAndPaddingBefore() - currentRegion->borderAndPaddingAfter();
if (lineTopAdjustedIntoNextRegion)
layoutState.setAdjustedLogicalLineTop(0);
}
if (!shapeInsideInfo)
return;
bool isFirstLineInRegion = logicalLineBottomInFlowThread <= (logicalRegionTopInFlowThread + lineHeight);
bool isFirstLineAdjusted = (logicalLineTopInFlowThread - logicalRegionTopInFlowThread) < (layoutState.adjustedLogicalLineTop() - currentRegion->borderAndPaddingBefore());
// We position the first line to the top of the shape in the region or to the previously adjusted position in the shape
if (isFirstLineInRegion || isFirstLineAdjusted) {
LayoutUnit shapeTopOffset = layoutState.adjustedLogicalLineTop();
if (!shapeTopOffset && (shapeInsideInfo->shapeLogicalTop() > 0))
shapeTopOffset = shapeInsideInfo->shapeLogicalTop();
LayoutUnit shapePositionInFlowThread = currentRegion->logicalTopForFlowThreadContent() + shapeTopOffset;
LayoutUnit shapeTopLineTopDelta = shapePositionInFlowThread - logicalLineTopInFlowThread - currentRegion->borderAndPaddingBefore();
setLogicalHeight(logicalHeight() + shapeTopLineTopDelta);
logicalLineTopInFlowThread += shapeTopLineTopDelta;
layoutState.setAdjustedLogicalLineTop(0);
}
LayoutUnit lineTop = logicalLineTopInFlowThread - currentRegion->logicalTopForFlowThreadContent() + currentRegion->borderAndPaddingBefore();
// FIXME: 118571 - Shape inside on a region does not yet take into account its padding for nested flow blocks
shapeInsideInfo->updateSegmentsForLine(LayoutSize(0, lineTop), lineHeight);
if (currentRegion->isLastRegion())
pushShapeContentOverflowBelowTheContentBox(this, shapeInsideInfo, lineTop, lineHeight);
}
static inline LayoutUnit adjustLogicalLineTop(ShapeInsideInfo* shapeInsideInfo, InlineIterator start, InlineIterator end, const WordMeasurements& wordMeasurements)
{
if (!shapeInsideInfo || end != start)
return 0;
float minWidth = firstPositiveWidth(wordMeasurements);
ASSERT(minWidth || wordMeasurements.isEmpty());
if (minWidth > 0 && shapeInsideInfo->adjustLogicalLineTop(minWidth))
return shapeInsideInfo->logicalLineTop();
return shapeInsideInfo->shapeLogicalBottom();
}
bool RenderBlockFlow::adjustLogicalLineTopAndLogicalHeightIfNeeded(ShapeInsideInfo* shapeInsideInfo, LayoutUnit absoluteLogicalTop, LineLayoutState& layoutState, InlineBidiResolver& resolver, FloatingObject* lastFloatFromPreviousLine, InlineIterator& end, WordMeasurements& wordMeasurements)
{
LayoutUnit adjustedLogicalLineTop = adjustLogicalLineTop(shapeInsideInfo, resolver.position(), end, wordMeasurements);
if (shapeInsideInfo && containsFloats()) {
lastFloatFromPreviousLine = m_floatingObjects->set().last().get();
if (!wordMeasurements.size()) {
LayoutUnit floatLogicalTopOffset = shapeInsideInfo->computeFirstFitPositionForFloat(logicalSizeForFloat(lastFloatFromPreviousLine));
if (logicalHeight() < floatLogicalTopOffset)
adjustedLogicalLineTop = floatLogicalTopOffset;
}
}
if (!adjustedLogicalLineTop)
return false;
LayoutUnit newLogicalHeight = adjustedLogicalLineTop - absoluteLogicalTop;
if (layoutState.flowThread()) {
layoutState.setAdjustedLogicalLineTop(adjustedLogicalLineTop);
newLogicalHeight = logicalHeight();
}
end = restartLayoutRunsAndFloatsInRange(logicalHeight(), newLogicalHeight, lastFloatFromPreviousLine, resolver, end);
return true;
}
#endif
void RenderBlockFlow::layoutRunsAndFloatsInRange(LineLayoutState& layoutState, InlineBidiResolver& resolver, const InlineIterator& cleanLineStart, const BidiStatus& cleanLineBidiStatus, unsigned consecutiveHyphenatedLines)
{
const RenderStyle& styleToUse = style();
bool paginated = view().layoutState() && view().layoutState()->isPaginated();
LineMidpointState& lineMidpointState = resolver.midpointState();
InlineIterator end = resolver.position();
bool checkForEndLineMatch = layoutState.endLine();
RenderTextInfo renderTextInfo;
VerticalPositionCache verticalPositionCache;
LineBreaker lineBreaker(*this);
#if ENABLE(CSS_SHAPES)
LayoutSize logicalOffsetFromShapeContainer;
ShapeInsideInfo* shapeInsideInfo = layoutShapeInsideInfo();
if (shapeInsideInfo) {
ASSERT(&shapeInsideInfo->owner() == this || allowsShapeInsideInfoSharing());
if (shapeInsideInfo != this->shapeInsideInfo()) {
// FIXME Bug 100284: If subsequent LayoutStates are pushed, we will have to add
// their offsets from the original shape-inside container.
logicalOffsetFromShapeContainer = logicalOffsetFromShapeAncestorContainer(&shapeInsideInfo->owner());
}
// Begin layout at the logical top of our shape inside.
if (logicalHeight() + logicalOffsetFromShapeContainer.height() < shapeInsideInfo->shapeLogicalTop()) {
LayoutUnit logicalHeight = shapeInsideInfo->shapeLogicalTop() - logicalOffsetFromShapeContainer.height();
if (layoutState.flowThread())
logicalHeight -= shapeInsideInfo->owner().borderAndPaddingBefore();
setLogicalHeight(logicalHeight);
}
}
#endif
while (!end.atEnd()) {
// FIXME: Is this check necessary before the first iteration or can it be moved to the end?
if (checkForEndLineMatch) {
layoutState.setEndLineMatched(matchedEndLine(layoutState, resolver, cleanLineStart, cleanLineBidiStatus));
if (layoutState.endLineMatched()) {
resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
break;
}
}
lineMidpointState.reset();
layoutState.lineInfo().setEmpty(true);
layoutState.lineInfo().resetRunsFromLeadingWhitespace();
const InlineIterator oldEnd = end;
bool isNewUBAParagraph = layoutState.lineInfo().previousLineBrokeCleanly();
FloatingObject* lastFloatFromPreviousLine = (containsFloats()) ? m_floatingObjects->set().last().get() : 0;
#if ENABLE(CSS_SHAPES)
updateShapeAndSegmentsForCurrentLine(shapeInsideInfo, logicalOffsetFromShapeContainer, layoutState);
#endif
WordMeasurements wordMeasurements;
end = lineBreaker.nextLineBreak(resolver, layoutState.lineInfo(), renderTextInfo, lastFloatFromPreviousLine, consecutiveHyphenatedLines, wordMeasurements);
renderTextInfo.m_lineBreakIterator.resetPriorContext();
if (resolver.position().atEnd()) {
// FIXME: We shouldn't be creating any runs in nextLineBreak to begin with!
// Once BidiRunList is separated from BidiResolver this will not be needed.
resolver.runs().deleteRuns();
resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
layoutState.setCheckForFloatsFromLastLine(true);
resolver.setPosition(InlineIterator(resolver.position().root(), 0, 0), 0);
break;
}
#if ENABLE(CSS_SHAPES)
if (adjustLogicalLineTopAndLogicalHeightIfNeeded(shapeInsideInfo, logicalOffsetFromShapeContainer.height(), layoutState, resolver, lastFloatFromPreviousLine, end, wordMeasurements))
continue;
#endif
ASSERT(end != resolver.position());
// This is a short-cut for empty lines.
if (layoutState.lineInfo().isEmpty()) {
if (lastRootBox())
lastRootBox()->setLineBreakInfo(end.renderer(), end.offset(), resolver.status());
} else {
VisualDirectionOverride override = (styleToUse.rtlOrdering() == VisualOrder ? (styleToUse.direction() == LTR ? VisualLeftToRightOverride : VisualRightToLeftOverride) : NoVisualOverride);
if (isNewUBAParagraph && styleToUse.unicodeBidi() == Plaintext && !resolver.context()->parent()) {
TextDirection direction = styleToUse.direction();
determineDirectionality(direction, resolver.position());
resolver.setStatus(BidiStatus(direction, isOverride(styleToUse.unicodeBidi())));
}
// FIXME: This ownership is reversed. We should own the BidiRunList and pass it to createBidiRunsForLine.
BidiRunList<BidiRun>& bidiRuns = resolver.runs();
constructBidiRunsForLine(this, resolver, bidiRuns, end, override, layoutState.lineInfo().previousLineBrokeCleanly());
ASSERT(resolver.position() == end);
BidiRun* trailingSpaceRun = !layoutState.lineInfo().previousLineBrokeCleanly() ? handleTrailingSpaces(bidiRuns, resolver.context()) : 0;
if (bidiRuns.runCount() && lineBreaker.lineWasHyphenated()) {
bidiRuns.logicallyLastRun()->m_hasHyphen = true;
consecutiveHyphenatedLines++;
} else
consecutiveHyphenatedLines = 0;
// Now that the runs have been ordered, we create the line boxes.
// At the same time we figure out where border/padding/margin should be applied for
// inline flow boxes.
LayoutUnit oldLogicalHeight = logicalHeight();
RootInlineBox* lineBox = createLineBoxesFromBidiRuns(bidiRuns, end, layoutState.lineInfo(), verticalPositionCache, trailingSpaceRun, wordMeasurements);
bidiRuns.deleteRuns();
resolver.markCurrentRunEmpty(); // FIXME: This can probably be replaced by an ASSERT (or just removed).
if (lineBox) {
lineBox->setLineBreakInfo(end.renderer(), end.offset(), resolver.status());
if (layoutState.usesRepaintBounds())
layoutState.updateRepaintRangeFromBox(lineBox);
if (paginated) {
LayoutUnit adjustment = 0;
adjustLinePositionForPagination(lineBox, adjustment, layoutState.flowThread());
if (adjustment) {
LayoutUnit oldLineWidth = availableLogicalWidthForLine(oldLogicalHeight, layoutState.lineInfo().isFirstLine());
lineBox->adjustBlockDirectionPosition(adjustment);
if (layoutState.usesRepaintBounds())
layoutState.updateRepaintRangeFromBox(lineBox);
if (availableLogicalWidthForLine(oldLogicalHeight + adjustment, layoutState.lineInfo().isFirstLine()) != oldLineWidth) {
// We have to delete this line, remove all floats that got added, and let line layout re-run.
lineBox->deleteLine();
end = restartLayoutRunsAndFloatsInRange(oldLogicalHeight, oldLogicalHeight + adjustment, lastFloatFromPreviousLine, resolver, oldEnd);
continue;
}
setLogicalHeight(lineBox->lineBottomWithLeading());
}
if (layoutState.flowThread())
updateRegionForLine(lineBox);
}
}
}
for (size_t i = 0; i < lineBreaker.positionedObjects().size(); ++i)
setStaticPositions(*this, *lineBreaker.positionedObjects()[i]);
if (!layoutState.lineInfo().isEmpty()) {
layoutState.lineInfo().setFirstLine(false);
newLine(lineBreaker.clear());
}
if (m_floatingObjects && lastRootBox()) {
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
auto it = floatingObjectSet.begin();
auto end = floatingObjectSet.end();
if (layoutState.lastFloat()) {
auto lastFloatIterator = floatingObjectSet.find<FloatingObject&, FloatingObjectHashTranslator>(*layoutState.lastFloat());
ASSERT(lastFloatIterator != end);
++lastFloatIterator;
it = lastFloatIterator;
}
for (; it != end; ++it) {
FloatingObject* f = it->get();
appendFloatingObjectToLastLine(f);
ASSERT(&f->renderer() == &layoutState.floats()[layoutState.floatIndex()].object);
// If a float's geometry has changed, give up on syncing with clean lines.
if (layoutState.floats()[layoutState.floatIndex()].rect != f->frameRect())
checkForEndLineMatch = false;
layoutState.setFloatIndex(layoutState.floatIndex() + 1);
}
layoutState.setLastFloat(!floatingObjectSet.isEmpty() ? floatingObjectSet.last().get() : nullptr);
}
lineMidpointState.reset();
resolver.setPosition(end, numberOfIsolateAncestors(end));
}
// In case we already adjusted the line positions during this layout to avoid widows
// then we need to ignore the possibility of having a new widows situation.
// Otherwise, we risk leaving empty containers which is against the block fragmentation principles.
if (paginated && !style().hasAutoWidows() && !didBreakAtLineToAvoidWidow()) {
// Check the line boxes to make sure we didn't create unacceptable widows.
// However, we'll prioritize orphans - so nothing we do here should create
// a new orphan.
RootInlineBox* lineBox = lastRootBox();
// Count from the end of the block backwards, to see how many hanging
// lines we have.
RootInlineBox* firstLineInBlock = firstRootBox();
int numLinesHanging = 1;
while (lineBox && lineBox != firstLineInBlock && !lineBox->isFirstAfterPageBreak()) {
++numLinesHanging;
lineBox = lineBox->prevRootBox();
}
// If there were no breaks in the block, we didn't create any widows.
if (!lineBox || !lineBox->isFirstAfterPageBreak() || lineBox == firstLineInBlock)
return;
if (numLinesHanging < style().widows()) {
// We have detected a widow. Now we need to work out how many
// lines there are on the previous page, and how many we need
// to steal.
int numLinesNeeded = style().widows() - numLinesHanging;
RootInlineBox* currentFirstLineOfNewPage = lineBox;
// Count the number of lines in the previous page.
lineBox = lineBox->prevRootBox();
int numLinesInPreviousPage = 1;
while (lineBox && lineBox != firstLineInBlock && !lineBox->isFirstAfterPageBreak()) {
++numLinesInPreviousPage;
lineBox = lineBox->prevRootBox();
}
// If there was an explicit value for orphans, respect that. If not, we still
// shouldn't create a situation where we make an orphan bigger than the initial value.
// This means that setting widows implies we also care about orphans, but given
// the specification says the initial orphan value is non-zero, this is ok. The
// author is always free to set orphans explicitly as well.
int orphans = style().hasAutoOrphans() ? style().initialOrphans() : style().orphans();
int numLinesAvailable = numLinesInPreviousPage - orphans;
if (numLinesAvailable <= 0)
return;
int numLinesToTake = std::min(numLinesAvailable, numLinesNeeded);
// Wind back from our first widowed line.
lineBox = currentFirstLineOfNewPage;
for (int i = 0; i < numLinesToTake; ++i)
lineBox = lineBox->prevRootBox();
// We now want to break at this line. Remember for next layout and trigger relayout.
setBreakAtLineToAvoidWidow(lineCount(lineBox));
markLinesDirtyInBlockRange(lastRootBox()->lineBottomWithLeading(), lineBox->lineBottomWithLeading(), lineBox);
}
}
clearDidBreakAtLineToAvoidWidow();
}
void RenderBlockFlow::linkToEndLineIfNeeded(LineLayoutState& layoutState)
{
if (layoutState.endLine()) {
if (layoutState.endLineMatched()) {
bool paginated = view().layoutState() && view().layoutState()->isPaginated();
// Attach all the remaining lines, and then adjust their y-positions as needed.
LayoutUnit delta = logicalHeight() - layoutState.endLineLogicalTop();
for (RootInlineBox* line = layoutState.endLine(); line; line = line->nextRootBox()) {
line->attachLine();
if (paginated) {
delta -= line->paginationStrut();
adjustLinePositionForPagination(line, delta, layoutState.flowThread());
}
if (delta) {
layoutState.updateRepaintRangeFromBox(line, delta);
line->adjustBlockDirectionPosition(delta);
}
if (layoutState.flowThread())
updateRegionForLine(line);
if (Vector<RenderBox*>* cleanLineFloats = line->floatsPtr()) {
for (auto it = cleanLineFloats->begin(), end = cleanLineFloats->end(); it != end; ++it) {
RenderBox* floatingBox = *it;
FloatingObject* floatingObject = insertFloatingObject(*floatingBox);
ASSERT(!floatingObject->originatingLine());
floatingObject->setOriginatingLine(line);
setLogicalHeight(logicalTopForChild(*floatingBox) - marginBeforeForChild(*floatingBox) + delta);
positionNewFloats();
}
}
}
setLogicalHeight(lastRootBox()->lineBottomWithLeading());
} else {
// Delete all the remaining lines.
deleteLineRange(layoutState, layoutState.endLine());
}
}
if (m_floatingObjects && (layoutState.checkForFloatsFromLastLine() || positionNewFloats()) && lastRootBox()) {
// In case we have a float on the last line, it might not be positioned up to now.
// This has to be done before adding in the bottom border/padding, or the float will
// include the padding incorrectly. -dwh
if (layoutState.checkForFloatsFromLastLine()) {
LayoutUnit bottomVisualOverflow = lastRootBox()->logicalBottomVisualOverflow();
LayoutUnit bottomLayoutOverflow = lastRootBox()->logicalBottomLayoutOverflow();
auto newLineBox = std::make_unique<TrailingFloatsRootInlineBox>(*this);
auto trailingFloatsLineBox = newLineBox.get();
m_lineBoxes.appendLineBox(std::move(newLineBox));
trailingFloatsLineBox->setConstructed();
GlyphOverflowAndFallbackFontsMap textBoxDataMap;
VerticalPositionCache verticalPositionCache;
LayoutUnit blockLogicalHeight = logicalHeight();
trailingFloatsLineBox->alignBoxesInBlockDirection(blockLogicalHeight, textBoxDataMap, verticalPositionCache);
trailingFloatsLineBox->setLineTopBottomPositions(blockLogicalHeight, blockLogicalHeight, blockLogicalHeight, blockLogicalHeight);
trailingFloatsLineBox->setPaginatedLineWidth(availableLogicalWidthForContent(blockLogicalHeight));
LayoutRect logicalLayoutOverflow(0, blockLogicalHeight, 1, bottomLayoutOverflow - blockLogicalHeight);
LayoutRect logicalVisualOverflow(0, blockLogicalHeight, 1, bottomVisualOverflow - blockLogicalHeight);
trailingFloatsLineBox->setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, trailingFloatsLineBox->lineTop(), trailingFloatsLineBox->lineBottom());
if (layoutState.flowThread())
updateRegionForLine(trailingFloatsLineBox);
}
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
auto it = floatingObjectSet.begin();
auto end = floatingObjectSet.end();
if (layoutState.lastFloat()) {
auto lastFloatIterator = floatingObjectSet.find<FloatingObject&, FloatingObjectHashTranslator>(*layoutState.lastFloat());
ASSERT(lastFloatIterator != end);
++lastFloatIterator;
it = lastFloatIterator;
}
for (; it != end; ++it)
appendFloatingObjectToLastLine(it->get());
layoutState.setLastFloat(!floatingObjectSet.isEmpty() ? floatingObjectSet.last().get() : nullptr);
}
}
void RenderBlockFlow::repaintDirtyFloats(Vector<FloatWithRect>& floats)
{
size_t floatCount = floats.size();
// Floats that did not have layout did not repaint when we laid them out. They would have
// painted by now if they had moved, but if they stayed at (0, 0), they still need to be
// painted.
for (size_t i = 0; i < floatCount; ++i) {
if (!floats[i].everHadLayout) {
RenderBox& box = floats[i].object;
if (!box.x() && !box.y() && box.checkForRepaintDuringLayout())
box.repaint();
}
}
}
void RenderBlockFlow::layoutLineBoxes(bool relayoutChildren, LayoutUnit& repaintLogicalTop, LayoutUnit& repaintLogicalBottom)
{
ASSERT(!m_simpleLineLayout);
setLogicalHeight(borderAndPaddingBefore());
// Lay out our hypothetical grid line as though it occurs at the top of the block.
if (view().layoutState() && view().layoutState()->lineGrid() == this)
layoutLineGridBox();
RenderFlowThread* flowThread = flowThreadContainingBlock();
bool clearLinesForPagination = firstRootBox() && flowThread && !flowThread->hasRegions();
// Figure out if we should clear out our line boxes.
// FIXME: Handle resize eventually!
bool isFullLayout = !firstRootBox() || selfNeedsLayout() || relayoutChildren || clearLinesForPagination;
LineLayoutState layoutState(isFullLayout, repaintLogicalTop, repaintLogicalBottom, flowThread);
if (isFullLayout)
lineBoxes().deleteLineBoxes();
// Text truncation kicks in in two cases:
// 1) If your overflow isn't visible and your text-overflow-mode isn't clip.
// 2) If you're an anonymous block with a block parent that satisfies #1.
// FIXME: CSS3 says that descendants that are clipped must also know how to truncate. This is insanely
// difficult to figure out in general (especially in the middle of doing layout), so we only handle the
// simple case of an anonymous block truncating when it's parent is clipped.
bool hasTextOverflow = (style().textOverflow() && hasOverflowClip())
|| (isAnonymousBlock() && parent() && parent()->isRenderBlock() && parent()->style().textOverflow() && parent()->hasOverflowClip());
// Walk all the lines and delete our ellipsis line boxes if they exist.
if (hasTextOverflow)
deleteEllipsisLineBoxes();
if (firstChild()) {
// In full layout mode, clear the line boxes of children upfront. Otherwise,
// siblings can run into stale root lineboxes during layout. Then layout
// the replaced elements later. In partial layout mode, line boxes are not
// deleted and only dirtied. In that case, we can layout the replaced
// elements at the same time.
bool hasInlineChild = false;
Vector<RenderBox*> replacedChildren;
for (InlineWalker walker(*this); !walker.atEnd(); walker.advance()) {
RenderObject& o = *walker.current();
if (!hasInlineChild && o.isInline())
hasInlineChild = true;
if (o.isReplaced() || o.isFloating() || o.isOutOfFlowPositioned()) {
RenderBox& box = toRenderBox(o);
if (relayoutChildren || box.hasRelativeDimensions())
box.setChildNeedsLayout(MarkOnlyThis);
// If relayoutChildren is set and the child has percentage padding or an embedded content box, we also need to invalidate the childs pref widths.
if (relayoutChildren && box.needsPreferredWidthsRecalculation())
box.setPreferredLogicalWidthsDirty(true, MarkOnlyThis);
if (box.isOutOfFlowPositioned())
box.containingBlock()->insertPositionedObject(box);
else if (box.isFloating())
layoutState.floats().append(FloatWithRect(box));
else if (isFullLayout || box.needsLayout()) {
// Replaced element.
box.dirtyLineBoxes(isFullLayout);
if (isFullLayout)
replacedChildren.append(&box);
else
box.layoutIfNeeded();
}
} else if (o.isTextOrLineBreak() || (o.isRenderInline() && !walker.atEndOfInline())) {
if (o.isRenderInline())
toRenderInline(o).updateAlwaysCreateLineBoxes(layoutState.isFullLayout());
if (layoutState.isFullLayout() || o.selfNeedsLayout())
dirtyLineBoxesForRenderer(o, layoutState.isFullLayout());
o.clearNeedsLayout();
}
}
for (size_t i = 0; i < replacedChildren.size(); i++)
replacedChildren[i]->layoutIfNeeded();
layoutRunsAndFloats(layoutState, hasInlineChild);
}
// Expand the last line to accommodate Ruby and emphasis marks.
int lastLineAnnotationsAdjustment = 0;
if (lastRootBox()) {
LayoutUnit lowestAllowedPosition = std::max(lastRootBox()->lineBottom(), logicalHeight() + paddingAfter());
if (!style().isFlippedLinesWritingMode())
lastLineAnnotationsAdjustment = lastRootBox()->computeUnderAnnotationAdjustment(lowestAllowedPosition);
else
lastLineAnnotationsAdjustment = lastRootBox()->computeOverAnnotationAdjustment(lowestAllowedPosition);
}
// Now add in the bottom border/padding.
setLogicalHeight(logicalHeight() + lastLineAnnotationsAdjustment + borderAndPaddingAfter() + scrollbarLogicalHeight());
if (!firstRootBox() && hasLineIfEmpty())
setLogicalHeight(logicalHeight() + lineHeight(true, isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes));
// See if we have any lines that spill out of our block. If we do, then we will possibly need to
// truncate text.
if (hasTextOverflow)
checkLinesForTextOverflow();
}
void RenderBlockFlow::checkFloatsInCleanLine(RootInlineBox* line, Vector<FloatWithRect>& floats, size_t& floatIndex, bool& encounteredNewFloat, bool& dirtiedByFloat)
{
Vector<RenderBox*>* cleanLineFloats = line->floatsPtr();
if (!cleanLineFloats)
return;
for (auto it = cleanLineFloats->begin(), end = cleanLineFloats->end(); it != end; ++it) {
RenderBox* floatingBox = *it;
floatingBox->layoutIfNeeded();
LayoutSize newSize(floatingBox->width() + floatingBox->marginWidth(), floatingBox->height() + floatingBox->marginHeight());
ASSERT_WITH_SECURITY_IMPLICATION(floatIndex < floats.size());
if (&floats[floatIndex].object != floatingBox) {
encounteredNewFloat = true;
return;
}
if (floats[floatIndex].rect.size() != newSize) {
LayoutUnit floatTop = isHorizontalWritingMode() ? floats[floatIndex].rect.y() : floats[floatIndex].rect.x();
LayoutUnit floatHeight = isHorizontalWritingMode() ? std::max(floats[floatIndex].rect.height(), newSize.height()) : std::max(floats[floatIndex].rect.width(), newSize.width());
floatHeight = std::min(floatHeight, LayoutUnit::max() - floatTop);
line->markDirty();
markLinesDirtyInBlockRange(line->lineBottomWithLeading(), floatTop + floatHeight, line);
floats[floatIndex].rect.setSize(newSize);
dirtiedByFloat = true;
}
floatIndex++;
}
}
RootInlineBox* RenderBlockFlow::determineStartPosition(LineLayoutState& layoutState, InlineBidiResolver& resolver)
{
RootInlineBox* curr = 0;
RootInlineBox* last = 0;
// FIXME: This entire float-checking block needs to be broken into a new function.
bool dirtiedByFloat = false;
if (!layoutState.isFullLayout()) {
// Paginate all of the clean lines.
bool paginated = view().layoutState() && view().layoutState()->isPaginated();
LayoutUnit paginationDelta = 0;
size_t floatIndex = 0;
for (curr = firstRootBox(); curr && !curr->isDirty(); curr = curr->nextRootBox()) {
if (paginated) {
if (lineWidthForPaginatedLineChanged(curr, 0, layoutState.flowThread())) {
curr->markDirty();
break;
}
paginationDelta -= curr->paginationStrut();
adjustLinePositionForPagination(curr, paginationDelta, layoutState.flowThread());
if (paginationDelta) {
if (containsFloats() || !layoutState.floats().isEmpty()) {
// FIXME: Do better eventually. For now if we ever shift because of pagination and floats are present just go to a full layout.
layoutState.markForFullLayout();
break;
}
layoutState.updateRepaintRangeFromBox(curr, paginationDelta);
curr->adjustBlockDirectionPosition(paginationDelta);
}
if (layoutState.flowThread())
updateRegionForLine(curr);
}
// If a new float has been inserted before this line or before its last known float, just do a full layout.
bool encounteredNewFloat = false;
checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
if (encounteredNewFloat)
layoutState.markForFullLayout();
if (dirtiedByFloat || layoutState.isFullLayout())
break;
}
// Check if a new float has been inserted after the last known float.
if (!curr && floatIndex < layoutState.floats().size())
layoutState.markForFullLayout();
}
if (layoutState.isFullLayout()) {
m_lineBoxes.deleteLineBoxTree();
curr = 0;
ASSERT(!firstRootBox() && !lastRootBox());
} else {
if (curr) {
// We have a dirty line.
if (RootInlineBox* prevRootBox = curr->prevRootBox()) {
// We have a previous line.
if (!dirtiedByFloat && (!prevRootBox->endsWithBreak() || !prevRootBox->lineBreakObj() || (prevRootBox->lineBreakObj()->isText() && prevRootBox->lineBreakPos() >= toRenderText(prevRootBox->lineBreakObj())->textLength())))
// The previous line didn't break cleanly or broke at a newline
// that has been deleted, so treat it as dirty too.
curr = prevRootBox;
}
} else {
// No dirty lines were found.
// If the last line didn't break cleanly, treat it as dirty.
if (lastRootBox() && !lastRootBox()->endsWithBreak())
curr = lastRootBox();
}
// If we have no dirty lines, then last is just the last root box.
last = curr ? curr->prevRootBox() : lastRootBox();
}
unsigned numCleanFloats = 0;
if (!layoutState.floats().isEmpty()) {
LayoutUnit savedLogicalHeight = logicalHeight();
// Restore floats from clean lines.
RootInlineBox* line = firstRootBox();
while (line != curr) {
if (Vector<RenderBox*>* cleanLineFloats = line->floatsPtr()) {
for (auto it = cleanLineFloats->begin(), end = cleanLineFloats->end(); it != end; ++it) {
RenderBox* floatingBox = *it;
FloatingObject* floatingObject = insertFloatingObject(*floatingBox);
ASSERT(!floatingObject->originatingLine());
floatingObject->setOriginatingLine(line);
setLogicalHeight(logicalTopForChild(*floatingBox) - marginBeforeForChild(*floatingBox));
positionNewFloats();
ASSERT(&layoutState.floats()[numCleanFloats].object == floatingBox);
numCleanFloats++;
}
}
line = line->nextRootBox();
}
setLogicalHeight(savedLogicalHeight);
}
layoutState.setFloatIndex(numCleanFloats);
layoutState.lineInfo().setFirstLine(!last);
layoutState.lineInfo().setPreviousLineBrokeCleanly(!last || last->endsWithBreak());
if (last) {
setLogicalHeight(last->lineBottomWithLeading());
InlineIterator iter = InlineIterator(this, last->lineBreakObj(), last->lineBreakPos());
resolver.setPosition(iter, numberOfIsolateAncestors(iter));
resolver.setStatus(last->lineBreakBidiStatus());
} else {
TextDirection direction = style().direction();
if (style().unicodeBidi() == Plaintext)
determineDirectionality(direction, InlineIterator(this, bidiFirstSkippingEmptyInlines(*this), 0));
resolver.setStatus(BidiStatus(direction, isOverride(style().unicodeBidi())));
InlineIterator iter = InlineIterator(this, bidiFirstSkippingEmptyInlines(*this, &resolver), 0);
resolver.setPosition(iter, numberOfIsolateAncestors(iter));
}
return curr;
}
void RenderBlockFlow::determineEndPosition(LineLayoutState& layoutState, RootInlineBox* startLine, InlineIterator& cleanLineStart, BidiStatus& cleanLineBidiStatus)
{
ASSERT(!layoutState.endLine());
size_t floatIndex = layoutState.floatIndex();
RootInlineBox* last = 0;
for (RootInlineBox* curr = startLine->nextRootBox(); curr; curr = curr->nextRootBox()) {
if (!curr->isDirty()) {
bool encounteredNewFloat = false;
bool dirtiedByFloat = false;
checkFloatsInCleanLine(curr, layoutState.floats(), floatIndex, encounteredNewFloat, dirtiedByFloat);
if (encounteredNewFloat)
return;
}
if (curr->isDirty())
last = 0;
else if (!last)
last = curr;
}
if (!last)
return;
// At this point, |last| is the first line in a run of clean lines that ends with the last line
// in the block.
RootInlineBox* prev = last->prevRootBox();
cleanLineStart = InlineIterator(this, prev->lineBreakObj(), prev->lineBreakPos());
cleanLineBidiStatus = prev->lineBreakBidiStatus();
layoutState.setEndLineLogicalTop(prev->lineBottomWithLeading());
for (RootInlineBox* line = last; line; line = line->nextRootBox())
line->extractLine(); // Disconnect all line boxes from their render objects while preserving
// their connections to one another.
layoutState.setEndLine(last);
}
bool RenderBlockFlow::checkPaginationAndFloatsAtEndLine(LineLayoutState& layoutState)
{
LayoutUnit lineDelta = logicalHeight() - layoutState.endLineLogicalTop();
bool paginated = view().layoutState() && view().layoutState()->isPaginated();
if (paginated && layoutState.flowThread()) {
// Check all lines from here to the end, and see if the hypothetical new position for the lines will result
// in a different available line width.
for (RootInlineBox* lineBox = layoutState.endLine(); lineBox; lineBox = lineBox->nextRootBox()) {
if (paginated) {
// This isn't the real move we're going to do, so don't update the line box's pagination
// strut yet.
LayoutUnit oldPaginationStrut = lineBox->paginationStrut();
lineDelta -= oldPaginationStrut;
adjustLinePositionForPagination(lineBox, lineDelta, layoutState.flowThread());
lineBox->setPaginationStrut(oldPaginationStrut);
}
if (lineWidthForPaginatedLineChanged(lineBox, lineDelta, layoutState.flowThread()))
return false;
}
}
if (!lineDelta || !m_floatingObjects)
return true;
// See if any floats end in the range along which we want to shift the lines vertically.
LayoutUnit logicalTop = std::min(logicalHeight(), layoutState.endLineLogicalTop());
RootInlineBox* lastLine = layoutState.endLine();
while (RootInlineBox* nextLine = lastLine->nextRootBox())
lastLine = nextLine;
LayoutUnit logicalBottom = lastLine->lineBottomWithLeading() + absoluteValue(lineDelta);
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
auto end = floatingObjectSet.end();
for (auto it = floatingObjectSet.begin(); it != end; ++it) {
FloatingObject* floatingObject = it->get();
if (logicalBottomForFloat(floatingObject) >= logicalTop && logicalBottomForFloat(floatingObject) < logicalBottom)
return false;
}
return true;
}
bool RenderBlockFlow::lineWidthForPaginatedLineChanged(RootInlineBox* rootBox, LayoutUnit lineDelta, RenderFlowThread* flowThread) const
{
if (!flowThread)
return false;
RenderRegion* currentRegion = regionAtBlockOffset(rootBox->lineTopWithLeading() + lineDelta);
// Just bail if the region didn't change.
if (rootBox->containingRegion() == currentRegion)
return false;
return rootBox->paginatedLineWidth() != availableLogicalWidthForContent(currentRegion);
}
bool RenderBlockFlow::matchedEndLine(LineLayoutState& layoutState, const InlineBidiResolver& resolver, const InlineIterator& endLineStart, const BidiStatus& endLineStatus)
{
if (resolver.position() == endLineStart) {
if (resolver.status() != endLineStatus)
return false;
return checkPaginationAndFloatsAtEndLine(layoutState);
}
// The first clean line doesn't match, but we can check a handful of following lines to try
// to match back up.
static int numLines = 8; // The # of lines we're willing to match against.
RootInlineBox* originalEndLine = layoutState.endLine();
RootInlineBox* line = originalEndLine;
for (int i = 0; i < numLines && line; i++, line = line->nextRootBox()) {
if (line->lineBreakObj() == resolver.position().renderer() && line->lineBreakPos() == resolver.position().offset()) {
// We have a match.
if (line->lineBreakBidiStatus() != resolver.status())
return false; // ...but the bidi state doesn't match.
bool matched = false;
RootInlineBox* result = line->nextRootBox();
layoutState.setEndLine(result);
if (result) {
layoutState.setEndLineLogicalTop(line->lineBottomWithLeading());
matched = checkPaginationAndFloatsAtEndLine(layoutState);
}
// Now delete the lines that we failed to sync.
deleteLineRange(layoutState, originalEndLine, result);
return matched;
}
}
return false;
}
bool RenderBlock::generatesLineBoxesForInlineChild(RenderObject* inlineObj)
{
ASSERT(inlineObj->parent() == this);
InlineIterator it(this, inlineObj, 0);
// FIXME: We should pass correct value for WhitespacePosition.
while (!it.atEnd() && !requiresLineBox(it))
it.increment();
return !it.atEnd();
}
void RenderBlockFlow::addOverflowFromInlineChildren()
{
if (auto layout = simpleLineLayout()) {
ASSERT(!hasOverflowClip());
SimpleLineLayout::collectFlowOverflow(*this, *layout);
return;
}
LayoutUnit endPadding = hasOverflowClip() ? paddingEnd() : LayoutUnit();
// FIXME: Need to find another way to do this, since scrollbars could show when we don't want them to.
if (hasOverflowClip() && !endPadding && element() && element()->isRootEditableElement() && style().isLeftToRightDirection())
endPadding = 1;
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
addLayoutOverflow(curr->paddedLayoutOverflowRect(endPadding));
RenderRegion* region = curr->containingRegion();
if (region)
region->addLayoutOverflowForBox(this, curr->paddedLayoutOverflowRect(endPadding));
if (!hasOverflowClip()) {
addVisualOverflow(curr->visualOverflowRect(curr->lineTop(), curr->lineBottom()));
if (region)
region->addVisualOverflowForBox(this, curr->visualOverflowRect(curr->lineTop(), curr->lineBottom()));
}
}
}
void RenderBlockFlow::deleteEllipsisLineBoxes()
{
ETextAlign textAlign = style().textAlign();
bool ltr = style().isLeftToRightDirection();
bool firstLine = true;
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
if (curr->hasEllipsisBox()) {
curr->clearTruncation();
// Shift the line back where it belongs if we cannot accomodate an ellipsis.
float logicalLeft = pixelSnappedLogicalLeftOffsetForLine(curr->lineTop(), firstLine);
float availableLogicalWidth = logicalRightOffsetForLine(curr->lineTop(), false) - logicalLeft;
float totalLogicalWidth = curr->logicalWidth();
updateLogicalWidthForAlignment(textAlign, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
if (ltr)
curr->adjustLogicalPosition((logicalLeft - curr->logicalLeft()), 0);
else
curr->adjustLogicalPosition(-(curr->logicalLeft() - logicalLeft), 0);
}
firstLine = false;
}
}
void RenderBlockFlow::checkLinesForTextOverflow()
{
// Determine the width of the ellipsis using the current font.
// FIXME: CSS3 says this is configurable, also need to use 0x002E (FULL STOP) if horizontal ellipsis is "not renderable"
const Font& font = style().font();
DEFINE_STATIC_LOCAL(AtomicString, ellipsisStr, (&horizontalEllipsis, 1));
const Font& firstLineFont = firstLineStyle().font();
int firstLineEllipsisWidth = firstLineFont.width(constructTextRun(this, firstLineFont, &horizontalEllipsis, 1, firstLineStyle()));
int ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(constructTextRun(this, font, &horizontalEllipsis, 1, style()));
// For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
// if the right edge of a line box exceeds that. For RTL, we use the left edge of the padding box and
// check the left edge of the line box to see if it is less
// Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
bool ltr = style().isLeftToRightDirection();
ETextAlign textAlign = style().textAlign();
bool firstLine = true;
for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
// FIXME: Use pixelSnappedLogicalRightOffsetForLine instead of snapping it ourselves once the column workaround in said method has been fixed.
// https://bugs.webkit.org/show_bug.cgi?id=105461
int blockRightEdge = snapSizeToPixel(logicalRightOffsetForLine(curr->lineTop(), firstLine), curr->x());
int blockLeftEdge = pixelSnappedLogicalLeftOffsetForLine(curr->lineTop(), firstLine);
int lineBoxEdge = ltr ? snapSizeToPixel(curr->x() + curr->logicalWidth(), curr->x()) : snapSizeToPixel(curr->x(), 0);
if ((ltr && lineBoxEdge > blockRightEdge) || (!ltr && lineBoxEdge < blockLeftEdge)) {
// This line spills out of our box in the appropriate direction. Now we need to see if the line
// can be truncated. In order for truncation to be possible, the line must have sufficient space to
// accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
// space.
LayoutUnit width = firstLine ? firstLineEllipsisWidth : ellipsisWidth;
LayoutUnit blockEdge = ltr ? blockRightEdge : blockLeftEdge;
if (curr->lineCanAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width)) {
float totalLogicalWidth = curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge, blockRightEdge, width);
float logicalLeft = 0; // We are only interested in the delta from the base position.
float truncatedWidth = pixelSnappedLogicalRightOffsetForLine(curr->lineTop(), firstLine);
updateLogicalWidthForAlignment(textAlign, 0, logicalLeft, totalLogicalWidth, truncatedWidth, 0);
if (ltr)
curr->adjustLogicalPosition(logicalLeft, 0);
else
curr->adjustLogicalPosition(-(truncatedWidth - (logicalLeft + totalLogicalWidth)), 0);
}
}
firstLine = false;
}
}
bool RenderBlockFlow::positionNewFloatOnLine(FloatingObject* newFloat, FloatingObject* lastFloatFromPreviousLine, LineInfo& lineInfo, LineWidth& width)
{
if (!positionNewFloats())
return false;
width.shrinkAvailableWidthForNewFloatIfNeeded(newFloat);
// We only connect floats to lines for pagination purposes if the floats occur at the start of
// the line and the previous line had a hard break (so this line is either the first in the block
// or follows a <br>).
if (!newFloat->paginationStrut() || !lineInfo.previousLineBrokeCleanly() || !lineInfo.isEmpty())
return true;
const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
ASSERT(floatingObjectSet.last().get() == newFloat);
LayoutUnit floatLogicalTop = logicalTopForFloat(newFloat);
int paginationStrut = newFloat->paginationStrut();
if (floatLogicalTop - paginationStrut != logicalHeight() + lineInfo.floatPaginationStrut())
return true;
auto it = floatingObjectSet.end();
--it; // Last float is newFloat, skip that one.
auto begin = floatingObjectSet.begin();
while (it != begin) {
--it;
FloatingObject* floatingObject = it->get();
if (floatingObject == lastFloatFromPreviousLine)
break;
if (logicalTopForFloat(floatingObject) == logicalHeight() + lineInfo.floatPaginationStrut()) {
floatingObject->setPaginationStrut(paginationStrut + floatingObject->paginationStrut());
RenderBox& floatBox = floatingObject->renderer();
setLogicalTopForChild(floatBox, logicalTopForChild(floatBox) + marginBeforeForChild(floatBox) + paginationStrut);
if (updateRegionRangeForBoxChild(floatingObject->renderer()))
floatBox.setNeedsLayout(MarkOnlyThis);
else if (floatBox.isRenderBlock())
toRenderBlock(floatBox).setChildNeedsLayout(MarkOnlyThis);
floatBox.layoutIfNeeded();
// Save the old logical top before calling removePlacedObject which will set
// isPlaced to false. Otherwise it will trigger an assert in logicalTopForFloat.
LayoutUnit oldLogicalTop = logicalTopForFloat(floatingObject);
m_floatingObjects->removePlacedObject(floatingObject);
setLogicalTopForFloat(floatingObject, oldLogicalTop + paginationStrut);
m_floatingObjects->addPlacedObject(floatingObject);
}
}
// Just update the line info's pagination strut without altering our logical height yet. If the line ends up containing
// no content, then we don't want to improperly grow the height of the block.
lineInfo.setFloatPaginationStrut(lineInfo.floatPaginationStrut() + paginationStrut);
return true;
}
LayoutUnit RenderBlockFlow::startAlignedOffsetForLine(LayoutUnit position, bool firstLine)
{
ETextAlign textAlign = style().textAlign();
// <rdar://problem/15427571>
// https://bugs.webkit.org/show_bug.cgi?id=124522
// This quirk is for legacy content that doesn't work properly with the center positioning scheme
// being honored (e.g., epubs).
if (textAlign == TASTART || document().settings()->useLegacyTextAlignPositionedElementBehavior()) // FIXME: Handle TAEND here
return startOffsetForLine(position, firstLine);
// updateLogicalWidthForAlignment() handles the direction of the block so no need to consider it here
float totalLogicalWidth = 0;
float logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false);
float availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
updateLogicalWidthForAlignment(textAlign, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
if (!style().isLeftToRightDirection())
return logicalWidth() - logicalLeft;
return logicalLeft;
}
void RenderBlockFlow::updateRegionForLine(RootInlineBox* lineBox) const
{
ASSERT(lineBox);
if (auto containingRegion = regionAtBlockOffset(lineBox->lineTopWithLeading()))
lineBox->setContainingRegion(*containingRegion);
else
lineBox->clearContainingRegion();
RootInlineBox* prevLineBox = lineBox->prevRootBox();
if (!prevLineBox)
return;
// This check is more accurate than the one in |adjustLinePositionForPagination| because it takes into
// account just the container changes between lines. The before mentioned function doesn't set the flag
// correctly if the line is positioned at the top of the last fragment container.
if (lineBox->containingRegion() != prevLineBox->containingRegion())
lineBox->setIsFirstAfterPageBreak(true);
}
}