MCL/sf/mw/web: comparison webengine/osswebengine/WebCore/rendering/InlineFlowBox.cpp

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--1:000000000000
+:dd21522fd290
+/*
+* Copyright (C) 2003, 2004, 2005, 2006, 2007 Apple Inc. All rights 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 "InlineFlowBox.h"
+#include "CachedImage.h"
+#include "Document.h"
+#include "EllipsisBox.h"
+#include "GraphicsContext.h"
+#include "InlineTextBox.h"
+#include "HitTestResult.h"
+#include "RootInlineBox.h"
+#include "RenderBlock.h"
+#include "RenderFlow.h"
+#include "RenderListMarker.h"
+#include "RenderTableCell.h"
+#include "RootInlineBox.h"
+#include "Text.h"
+#include <math.h>
+using namespace std;
+namespace WebCore {
+#ifndef NDEBUG
+InlineFlowBox::~InlineFlowBox()
+{
+if (!m_hasBadChildList)
+for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
+child->setHasBadParent();
+}
+#endif
+RenderFlow* InlineFlowBox::flowObject()
+{
+return static_cast<RenderFlow*>(m_object);
+}
+int InlineFlowBox::marginLeft()
+{
+if (!includeLeftEdge())
+return 0;
+Length margin = object()->style()->marginLeft();
+if (margin.isAuto())
+return 0;
+if (margin.isFixed())
+return margin.value();
+return object()->marginLeft();
+}
+int InlineFlowBox::marginRight()
+{
+if (!includeRightEdge())
+return 0;
+Length margin = object()->style()->marginRight();
+if (margin.isAuto())
+return 0;
+if (margin.isFixed())
+return margin.value();
+return object()->marginRight();
+}
+int InlineFlowBox::marginBorderPaddingLeft()
+{
+return marginLeft() + borderLeft() + paddingLeft();
+}
+int InlineFlowBox::marginBorderPaddingRight()
+{
+return marginRight() + borderRight() + paddingRight();
+}
+int InlineFlowBox::getFlowSpacingWidth()
+{
+int totWidth = marginBorderPaddingLeft() + marginBorderPaddingRight();
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (curr->isInlineFlowBox())
+totWidth += static_cast<InlineFlowBox*>(curr)->getFlowSpacingWidth();
+}
+return totWidth;
+}
+void InlineFlowBox::addToLine(InlineBox* child)
+{
+ASSERT(!child->parent());
+ASSERT(!child->nextOnLine());
+ASSERT(!child->prevOnLine());
+checkConsistency();
+child->setParent(this);
+if (!m_firstChild) {
+m_firstChild = child;
+m_lastChild = child;
+} else {
+m_lastChild->setNextOnLine(child);
+child->setPrevOnLine(m_lastChild);
+m_lastChild = child;
+}
+child->setFirstLineStyleBit(m_firstLine);
+if (child->isText())
+m_hasTextChildren = true;
+if (child->object()->selectionState() != RenderObject::SelectionNone)
+root()->setHasSelectedChildren(true);
+checkConsistency();
+}
+void InlineFlowBox::removeChild(InlineBox* child)
+{
+checkConsistency();
+if (!m_dirty)
+dirtyLineBoxes();
+root()->childRemoved(child);
+if (child == m_firstChild)
+m_firstChild = child->nextOnLine();
+if (child == m_lastChild)
+m_lastChild = child->prevOnLine();
+if (child->nextOnLine())
+child->nextOnLine()->setPrevOnLine(child->prevOnLine());
+if (child->prevOnLine())
+child->prevOnLine()->setNextOnLine(child->nextOnLine());
+child->setParent(0);
+checkConsistency();
+}
+void InlineFlowBox::deleteLine(RenderArena* arena)
+{
+InlineBox* child = firstChild();
+InlineBox* next = 0;
+while (child) {
+ASSERT(this == child->parent());
+next = child->nextOnLine();
+#ifndef NDEBUG
+child->setParent(0);
+#endif
+child->deleteLine(arena);
+child = next;
+}
+#ifndef NDEBUG
+m_firstChild = 0;
+m_lastChild = 0;
+#endif
+static_cast<RenderFlow*>(m_object)->removeLineBox(this);
+destroy(arena);
+}
+void InlineFlowBox::extractLine()
+{
+if (!m_extracted)
+static_cast<RenderFlow*>(m_object)->extractLineBox(this);
+for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
+child->extractLine();
+}
+void InlineFlowBox::attachLine()
+{
+if (m_extracted)
+static_cast<RenderFlow*>(m_object)->attachLineBox(this);
+for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
+child->attachLine();
+}
+void InlineFlowBox::adjustPosition(int dx, int dy)
+{
+InlineRunBox::adjustPosition(dx, dy);
+for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
+child->adjustPosition(dx, dy);
+}
+bool InlineFlowBox::onEndChain(RenderObject* endObject)
+{
+if (!endObject)
+return false;
+if (endObject == object())
+return true;
+RenderObject* curr = endObject;
+RenderObject* parent = curr->parent();
+while (parent && !parent->isRenderBlock()) {
+if (parent->lastChild() != curr || parent == object())
+return false;
+curr = parent;
+parent = curr->parent();
+}
+return true;
+}
+void InlineFlowBox::determineSpacingForFlowBoxes(bool lastLine, RenderObject* endObject)
+{
+// All boxes start off open.  They will not apply any margins/border/padding on
+// any side.
+bool includeLeftEdge = false;
+bool includeRightEdge = false;
+RenderFlow* flow = static_cast<RenderFlow*>(object());
+if (!flow->firstChild())
+includeLeftEdge = includeRightEdge = true; // Empty inlines never split across lines.
+else if (parent()) { // The root inline box never has borders/margins/padding.
+bool ltr = flow->style()->direction() == LTR;
+// Check to see if all initial lines are unconstructed.  If so, then
+// we know the inline began on this line.
+if (!flow->firstLineBox()->isConstructed()) {
+if (ltr && flow->firstLineBox() == this)
+includeLeftEdge = true;
+else if (!ltr && flow->lastLineBox() == this)
+includeRightEdge = true;
+}
+// In order to determine if the inline ends on this line, we check three things:
+// (1) If we are the last line and we don't have a continuation(), then we can
+// close up.
+// (2) If the last line box for the flow has an object following it on the line (ltr,
+// reverse for rtl), then the inline has closed.
+// (3) The line may end on the inline.  If we are the last child (climbing up
+// the end object's chain), then we just closed as well.
+if (!flow->lastLineBox()->isConstructed()) {
+if (ltr) {
+if (!nextLineBox() &&
+((lastLine && !object()->continuation()) || nextOnLineExists() || onEndChain(endObject)))
+includeRightEdge = true;
+} else {
+if ((!prevLineBox() || prevLineBox()->isConstructed()) &&
+((lastLine && !object()->continuation()) || prevOnLineExists() || onEndChain(endObject)))
+includeLeftEdge = true;
+}
+}
+}
+setEdges(includeLeftEdge, includeRightEdge);
+// Recur into our children.
+for (InlineBox* currChild = firstChild(); currChild; currChild = currChild->nextOnLine()) {
+if (currChild->isInlineFlowBox()) {
+InlineFlowBox* currFlow = static_cast<InlineFlowBox*>(currChild);
+currFlow->determineSpacingForFlowBoxes(lastLine, endObject);
+}
+}
+}
+int InlineFlowBox::placeBoxesHorizontally(int x, int& leftPosition, int& rightPosition, bool& needsWordSpacing)
+{
+// Set our x position.
+setXPos(x);
+int boxShadowLeft = 0;
+int boxShadowRight = 0;
+if (ShadowData* boxShadow = object()->style(m_firstLine)->boxShadow()) {
+boxShadowLeft = min(boxShadow->x - boxShadow->blur, 0);
+boxShadowRight = max(boxShadow->x + boxShadow->blur, 0);
+}
+leftPosition = min(x + boxShadowLeft, leftPosition);
+int startX = x;
+x += borderLeft() + paddingLeft();
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (curr->object()->isText()) {
+InlineTextBox* text = static_cast<InlineTextBox*>(curr);
+RenderText* rt = static_cast<RenderText*>(text->object());
+if (rt->textLength()) {
+if (needsWordSpacing && DeprecatedChar(rt->characters()[text->start()]).isSpace())
+x += rt->style(m_firstLine)->font().wordSpacing();
+needsWordSpacing = !DeprecatedChar(rt->characters()[text->end()]).isSpace();
+}
+text->setXPos(x);
+int strokeOverflow = static_cast<int>(ceilf(rt->style()->textStrokeWidth() / 2.0f));
+// If letter-spacing is negative, we should factor that into right overflow. (Even in RTL, letter-spacing is
+// applied to the right, so this is not an issue with left overflow.
+int letterSpacing = min(0, (int)rt->style(m_firstLine)->font().letterSpacing());
+int leftGlyphOverflow = -strokeOverflow;
+int rightGlyphOverflow = strokeOverflow - letterSpacing;
+int visualOverflowLeft = leftGlyphOverflow;
+int visualOverflowRight = rightGlyphOverflow;
+for (ShadowData* shadow = rt->style()->textShadow(); shadow; shadow = shadow->next) {
+visualOverflowLeft = min(visualOverflowLeft, shadow->x - shadow->blur + leftGlyphOverflow);
+visualOverflowRight = max(visualOverflowRight, shadow->x + shadow->blur + rightGlyphOverflow);
+}
+leftPosition = min(x + visualOverflowLeft, leftPosition);
+rightPosition = max(x + text->width() + visualOverflowRight, rightPosition);
+m_maxHorizontalVisualOverflow = max(max(visualOverflowRight, -visualOverflowLeft), m_maxHorizontalVisualOverflow);
+x += text->width();
+} else {
+if (curr->object()->isPositioned()) {
+if (curr->object()->parent()->style()->direction() == LTR)
+curr->setXPos(x);
+else
+// Our offset that we cache needs to be from the edge of the right border box and
+// not the left border box.  We have to subtract |x| from the width of the block
+// (which can be obtained from the root line box).
+curr->setXPos(root()->object()->width()-x);
+continue; // The positioned object has no effect on the width.
+}
+if (curr->object()->isInlineFlow()) {
+InlineFlowBox* flow = static_cast<InlineFlowBox*>(curr);
+if (curr->object()->isCompact()) {
+int ignoredX = x;
+flow->placeBoxesHorizontally(ignoredX, leftPosition, rightPosition, needsWordSpacing);
+} else {
+x += flow->marginLeft();
+x = flow->placeBoxesHorizontally(x, leftPosition, rightPosition, needsWordSpacing);
+x += flow->marginRight();
+}
+} else if (!curr->object()->isCompact() && (!curr->object()->isListMarker() || static_cast<RenderListMarker*>(curr->object())->isInside())) {
+x += curr->object()->marginLeft();
+curr->setXPos(x);
+leftPosition = min(x + curr->object()->overflowLeft(false), leftPosition);
+rightPosition = max(x + curr->object()->overflowWidth(false), rightPosition);
+x += curr->width() + curr->object()->marginRight();
+}
+}
+}
+x += borderRight() + paddingRight();
+setWidth(x - startX);
+rightPosition = max(xPos() + width() + boxShadowRight, rightPosition);
+return x;
+}
+void InlineFlowBox::verticallyAlignBoxes(int& heightOfBlock)
+{
+int maxPositionTop = 0;
+int maxPositionBottom = 0;
+int maxAscent = 0;
+int maxDescent = 0;
+// Figure out if we're in strict mode.  Note that we can't simply use !style()->htmlHacks(),
+// because that would match almost strict mode as well.
+RenderObject* curr = object();
+while (curr && !curr->element())
+curr = curr->container();
+bool strictMode = (curr && curr->document()->inStrictMode());
+computeLogicalBoxHeights(maxPositionTop, maxPositionBottom, maxAscent, maxDescent, strictMode);
+if (maxAscent + maxDescent < max(maxPositionTop, maxPositionBottom))
+adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
+int maxHeight = maxAscent + maxDescent;
+int topPosition = heightOfBlock;
+int bottomPosition = heightOfBlock;
+int selectionTop = heightOfBlock;
+int selectionBottom = heightOfBlock;
+placeBoxesVertically(heightOfBlock, maxHeight, maxAscent, strictMode, topPosition, bottomPosition, selectionTop, selectionBottom);
+setVerticalOverflowPositions(topPosition, bottomPosition);
+setVerticalSelectionPositions(selectionTop, selectionBottom);
+// Shrink boxes with no text children in quirks and almost strict mode.
+if (!strictMode)
+shrinkBoxesWithNoTextChildren(topPosition, bottomPosition);
+heightOfBlock += maxHeight;
+}
+void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent,
+int maxPositionTop, int maxPositionBottom)
+{
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+// The computed lineheight needs to be extended for the
+// positioned elements
+if (curr->object()->isPositioned())
+continue; // Positioned placeholders don't affect calculations.
+if (curr->yPos() == PositionTop || curr->yPos() == PositionBottom) {
+if (curr->yPos() == PositionTop) {
+if (maxAscent + maxDescent < curr->height())
+maxDescent = curr->height() - maxAscent;
+}
+else {
+if (maxAscent + maxDescent < curr->height())
+maxAscent = curr->height() - maxDescent;
+}
+if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
+break;
+}
+if (curr->isInlineFlowBox())
+static_cast<InlineFlowBox*>(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
+}
+}
+void InlineFlowBox::computeLogicalBoxHeights(int& maxPositionTop, int& maxPositionBottom,
+int& maxAscent, int& maxDescent, bool strictMode)
+{
+if (isRootInlineBox()) {
+// Examine our root box.
+setHeight(object()->lineHeight(m_firstLine, true));
+bool isTableCell = object()->isTableCell();
+if (isTableCell) {
+RenderTableCell* tableCell = static_cast<RenderTableCell*>(object());
+setBaseline(tableCell->RenderBlock::baselinePosition(m_firstLine, true));
+}
+else
+setBaseline(object()->baselinePosition(m_firstLine, true));
+if (hasTextChildren() || strictMode) {
+int ascent = baseline();
+int descent = height() - ascent;
+if (maxAscent < ascent)
+maxAscent = ascent;
+if (maxDescent < descent)
+maxDescent = descent;
+}
+}
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (curr->object()->isPositioned())
+continue; // Positioned placeholders don't affect calculations.
+curr->setHeight(curr->object()->lineHeight(m_firstLine));
+curr->setBaseline(curr->object()->baselinePosition(m_firstLine));
+curr->setYPos(curr->object()->verticalPositionHint(m_firstLine));
+if (curr->yPos() == PositionTop) {
+if (maxPositionTop < curr->height())
+maxPositionTop = curr->height();
+}
+else if (curr->yPos() == PositionBottom) {
+if (maxPositionBottom < curr->height())
+maxPositionBottom = curr->height();
+}
+else if (curr->hasTextChildren() || strictMode) {
+int ascent = curr->baseline() - curr->yPos();
+int descent = curr->height() - ascent;
+if (maxAscent < ascent)
+maxAscent = ascent;
+if (maxDescent < descent)
+maxDescent = descent;
+}
+if (curr->isInlineFlowBox())
+static_cast<InlineFlowBox*>(curr)->computeLogicalBoxHeights(maxPositionTop, maxPositionBottom, maxAscent, maxDescent, strictMode);
+}
+}
+void InlineFlowBox::placeBoxesVertically(int y, int maxHeight, int maxAscent, bool strictMode,
+int& topPosition, int& bottomPosition, int& selectionTop, int& selectionBottom)
+{
+if (isRootInlineBox())
+setYPos(y + maxAscent - baseline());// Place our root box.
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (curr->object()->isPositioned())
+continue; // Positioned placeholders don't affect calculations.
+// Adjust boxes to use their real box y/height and not the logical height (as dictated by
+// line-height).
+if (curr->isInlineFlowBox())
+static_cast<InlineFlowBox*>(curr)->placeBoxesVertically(y, maxHeight, maxAscent, strictMode, topPosition, bottomPosition, selectionTop, selectionBottom);
+bool childAffectsTopBottomPos = true;
+if (curr->yPos() == PositionTop)
+curr->setYPos(y);
+else if (curr->yPos() == PositionBottom)
+curr->setYPos(y + maxHeight - curr->height());
+else {
+if (!curr->hasTextChildren() && !strictMode)
+childAffectsTopBottomPos = false;
+curr->setYPos(curr->yPos() + y + maxAscent - curr->baseline());
+}
+int newY = curr->yPos();
+int newHeight = curr->height();
+int newBaseline = curr->baseline();
+int overflowTop = 0;
+int overflowBottom = 0;
+if (curr->isText() || curr->isInlineFlowBox()) {
+const Font& font = curr->object()->style(m_firstLine)->font();
+newBaseline = font.ascent();
+newY += curr->baseline() - newBaseline;
+newHeight = newBaseline + font.descent();
+for (ShadowData* shadow = curr->object()->style()->textShadow(); shadow; shadow = shadow->next) {
+overflowTop = min(overflowTop, shadow->y - shadow->blur);
+overflowBottom = max(overflowBottom, shadow->y + shadow->blur);
+}
+if (ShadowData* boxShadow = curr->object()->style(m_firstLine)->boxShadow()) {
+overflowTop = min(overflowTop, boxShadow->y - boxShadow->blur);
+overflowBottom = max(overflowBottom, boxShadow->y + boxShadow->blur);
+}
+if (curr->isInlineFlowBox()) {
+newHeight += curr->object()->borderTop() + curr->object()->paddingTop() +
+curr->object()->borderBottom() + curr->object()->paddingBottom();
+newY -= curr->object()->borderTop() + curr->object()->paddingTop();
+newBaseline += curr->object()->borderTop() + curr->object()->paddingTop();
+}
+} else if (!curr->object()->isBR()) {
+newY += curr->object()->marginTop();
+newHeight = curr->height() - (curr->object()->marginTop() + curr->object()->marginBottom());
+overflowTop = curr->object()->overflowTop(false);
+overflowBottom = curr->object()->overflowHeight(false) - newHeight;
+}
+curr->setYPos(newY);
+curr->setHeight(newHeight);
+curr->setBaseline(newBaseline);
+if (childAffectsTopBottomPos) {
+selectionTop = min(selectionTop, newY);
+selectionBottom = max(selectionBottom, newY + newHeight);
+topPosition = min(topPosition, newY + overflowTop);
+bottomPosition = max(bottomPosition, newY + newHeight + overflowBottom);
+}
+}
+if (isRootInlineBox()) {
+const Font& font = object()->style(m_firstLine)->font();
+setHeight(font.ascent() + font.descent());
+setYPos(yPos() + baseline() - font.ascent());
+setBaseline(font.ascent());
+if (hasTextChildren() || strictMode) {
+selectionTop = min(selectionTop, yPos());
+selectionBottom = max(selectionBottom, yPos() + height());
+}
+}
+}
+void InlineFlowBox::shrinkBoxesWithNoTextChildren(int topPos, int bottomPos)
+{
+// First shrink our kids.
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (curr->object()->isPositioned())
+continue; // Positioned placeholders don't affect calculations.
+if (curr->isInlineFlowBox())
+static_cast<InlineFlowBox*>(curr)->shrinkBoxesWithNoTextChildren(topPos, bottomPos);
+}
+// See if we have text children. If not, then we need to shrink ourselves to fit on the line.
+if (!hasTextChildren()) {
+if (yPos() < topPos)
+setYPos(topPos);
+if (yPos() + height() > bottomPos)
+setHeight(bottomPos - yPos());
+if (baseline() > height())
+setBaseline(height());
+}
+}
+bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int x, int y, int tx, int ty)
+{
+// Check children first.
+for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {
+if (!curr->object()->hasLayer() && curr->nodeAtPoint(request, result, x, y, tx, ty)) {
+object()->updateHitTestResult(result, IntPoint(x - tx, y - ty));
+return true;
+}
+}
+// Now check ourselves.
+IntRect rect(tx + m_x, ty + m_y, m_width, m_height);
+if (object()->style()->visibility() == VISIBLE && rect.contains(x, y)) {
+object()->updateHitTestResult(result, IntPoint(x - tx, y - ty)); // Don't add in m_x or m_y here, we want coords in the containing block's space.
+return true;
+}
+return false;
+}
+void InlineFlowBox::paint(RenderObject::PaintInfo& paintInfo, int tx, int ty)
+{
+int xPos = tx + m_x - object()->maximalOutlineSize(paintInfo.phase);
+int w = width() + 2 * object()->maximalOutlineSize(paintInfo.phase);
+if (ShadowData* boxShadow = object()->style(m_firstLine)->boxShadow()) {
+int shadowLeft = min(boxShadow->x - boxShadow->blur, 0);
+xPos += shadowLeft;
+w += -shadowLeft + max(boxShadow->x + boxShadow->blur, 0);
+}
+bool intersectsDamageRect = xPos < paintInfo.rect.right() && xPos + w > paintInfo.rect.x();
+if (intersectsDamageRect && paintInfo.phase != PaintPhaseChildOutlines) {
+if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) {
+// Add ourselves to the paint info struct's list of inlines that need to paint their
+// outlines.
+if (object()->style()->visibility() == VISIBLE && object()->hasOutline() && !isRootInlineBox()) {
+if ((object()->continuation() || object()->isInlineContinuation()) && !object()->hasLayer()) {
+// Add ourselves to the containing block of the entire continuation so that it can
+// paint us atomically.
+RenderBlock* block = object()->containingBlock()->containingBlock();
+block->addContinuationWithOutline(static_cast<RenderFlow*>(object()->element()->renderer()));
+} else if (!object()->isInlineContinuation())
+paintInfo.outlineObjects->add(flowObject());
+}
+} else {
+// 1. Paint our background, border and box-shadow.
+paintBoxDecorations(paintInfo, tx, ty);
+// 2. Paint our underline and overline.
+paintTextDecorations(paintInfo, tx, ty, false);
+}
+}
+PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
+RenderObject::PaintInfo childInfo(paintInfo);
+childInfo.phase = paintPhase;
+childInfo.paintingRoot = object()->paintingRootForChildren(paintInfo);
+// 3. Paint our children.
+if (paintPhase != PaintPhaseSelfOutline) {
+for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
+if (!curr->object()->hasLayer())
+curr->paint(childInfo, tx, ty);
+}
+}
+// 4. Paint our strike-through
+if (intersectsDamageRect && (paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection))
+paintTextDecorations(paintInfo, tx, ty, true);
+}
+void InlineFlowBox::paintBackgrounds(GraphicsContext* p, const Color& c, const BackgroundLayer* bgLayer,
+int my, int mh, int _tx, int _ty, int w, int h)
+{
+if (!bgLayer)
+return;
+paintBackgrounds(p, c, bgLayer->next(), my, mh, _tx, _ty, w, h);
+paintBackground(p, c, bgLayer, my, mh, _tx, _ty, w, h);
+}
+void InlineFlowBox::paintBackground(GraphicsContext* context, const Color& c, const BackgroundLayer* bgLayer,
+int my, int mh, int tx, int ty, int w, int h)
+{
+CachedImage* bg = bgLayer->backgroundImage();
+bool hasBackgroundImage = bg && bg->canRender();
+if ((!hasBackgroundImage && !object()->style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent())
+object()->paintBackgroundExtended(context, c, bgLayer, my, mh, tx, ty, w, h);
+else {
+// We have a background image that spans multiple lines.
+// We need to adjust _tx and _ty by the width of all previous lines.
+// Think of background painting on inlines as though you had one long line, a single continuous
+// strip.  Even though that strip has been broken up across multiple lines, you still paint it
+// as though you had one single line.  This means each line has to pick up the background where
+// the previous line left off.
+// FIXME: What the heck do we do with RTL here? The math we're using is obviously not right,
+// but it isn't even clear how this should work at all.
+int xOffsetOnLine = 0;
+for (InlineRunBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
+xOffsetOnLine += curr->width();
+int startX = tx - xOffsetOnLine;
+int totalWidth = xOffsetOnLine;
+for (InlineRunBox* curr = this; curr; curr = curr->nextLineBox())
+totalWidth += curr->width();
+context->save();
+context->clip(IntRect(tx, ty, width(), height()));
+object()->paintBackgroundExtended(context, c, bgLayer, my, mh, startX, ty,
+totalWidth, h, includeLeftEdge(), includeRightEdge());
+context->restore();
+}
+}
+void InlineFlowBox::paintBoxShadow(GraphicsContext* context, RenderStyle* s, int tx, int ty, int w, int h)
+{
+if ((!prevLineBox() && !nextLineBox()) || !parent())
+object()->paintBoxShadow(context, tx, ty, w, h, s);
+else {
+// FIXME: We can do better here in the multi-line case. We want to push a clip so that the shadow doesn't
+// protrude incorrectly at the edges, and we want to possibly include shadows cast from the previous/following lines
+object()->paintBoxShadow(context, tx, ty, w, h, s, includeLeftEdge(), includeRightEdge());
+}
+}
+void InlineFlowBox::paintBoxDecorations(RenderObject::PaintInfo& paintInfo, int tx, int ty)
+{
+if (!object()->shouldPaintWithinRoot(paintInfo) || object()->style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
+return;
+// Move x/y to our coordinates.
+tx += m_x;
+ty += m_y;
+int w = width();
+int h = height();
+int my = max(ty, paintInfo.rect.y());
+int mh;
+if (ty < paintInfo.rect.y())
+mh = max(0, h - (paintInfo.rect.y() - ty));
+else
+mh = min(paintInfo.rect.height(), h);
+GraphicsContext* context = paintInfo.context;
+// You can use p::first-line to specify a background. If so, the root line boxes for
+// a line may actually have to paint a background.
+RenderStyle* styleToUse = object()->style(m_firstLine);
+if ((!parent() && m_firstLine && styleToUse != object()->style()) || (parent() && object()->hasBoxDecorations())) {
+// Shadow comes first and is behind the background and border.
+if (styleToUse->boxShadow())
+paintBoxShadow(context, styleToUse, tx, ty, w, h);
+Color c = styleToUse->backgroundColor();
+paintBackgrounds(context, c, styleToUse->backgroundLayers(), my, mh, tx, ty, w, h);
+// :first-line cannot be used to put borders on a line. Always paint borders with our
+// non-first-line style.
+if (parent() && object()->style()->hasBorder()) {
+CachedImage* borderImage = object()->style()->borderImage().image();
+bool hasBorderImage = borderImage && borderImage->canRender();
+if (hasBorderImage && !borderImage->isLoaded())
+return; // Don't paint anything while we wait for the image to load.
+// The simple case is where we either have no border image or we are the only box for this object.  In those
+// cases only a single call to draw is required.
+if (!hasBorderImage || (!prevLineBox() && !nextLineBox()))
+object()->paintBorder(context, tx, ty, w, h, object()->style(), includeLeftEdge(), includeRightEdge());
+else {
+// We have a border image that spans multiple lines.
+// We need to adjust _tx and _ty by the width of all previous lines.
+// Think of border image painting on inlines as though you had one long line, a single continuous
+// strip.  Even though that strip has been broken up across multiple lines, you still paint it
+// as though you had one single line.  This means each line has to pick up the image where
+// the previous line left off.
+// FIXME: What the heck do we do with RTL here? The math we're using is obviously not right,
+// but it isn't even clear how this should work at all.
+int xOffsetOnLine = 0;
+for (InlineRunBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
+xOffsetOnLine += curr->width();
+int startX = tx - xOffsetOnLine;
+int totalWidth = xOffsetOnLine;
+for (InlineRunBox* curr = this; curr; curr = curr->nextLineBox())
+totalWidth += curr->width();
+context->save();
+context->clip(IntRect(tx, ty, width(), height()));
+object()->paintBorder(context, startX, ty, totalWidth, h, object()->style());
+context->restore();
+}
+}
+}
+}
+static bool shouldDrawTextDecoration(RenderObject* obj)
+{
+for (RenderObject* curr = obj->firstChild(); curr; curr = curr->nextSibling()) {
+if (curr->isInlineFlow())
+return true;
+if (curr->isText() && !curr->isBR()) {
+if (!curr->style()->collapseWhiteSpace())
+return true;
+Node* currElement = curr->element();
+if (!currElement)
+return true;
+if (!currElement->isTextNode())
+return true;
+if (!static_cast<Text*>(currElement)->containsOnlyWhitespace())
+return true;
+}
+}
+return false;
+}
+void InlineFlowBox::paintTextDecorations(RenderObject::PaintInfo& paintInfo, int tx, int ty, bool paintedChildren)
+{
+// Paint text decorations like underlines/overlines. We only do this if we aren't in quirks mode (i.e., in
+// almost-strict mode or strict mode).
+if (object()->style()->htmlHacks() || !object()->shouldPaintWithinRoot(paintInfo) ||
+object()->style()->visibility() != VISIBLE)
+return;
+// We don't want underlines or other decorations when we're trying to draw nothing but the selection as white text.
+if (paintInfo.phase == PaintPhaseSelection && paintInfo.forceBlackText)
+return;
+GraphicsContext* context = paintInfo.context;
+tx += m_x;
+ty += m_y;
+RenderStyle* styleToUse = object()->style(m_firstLine);
+int deco = parent() ? styleToUse->textDecoration() : styleToUse->textDecorationsInEffect();
+if (deco != TDNONE &&
+((!paintedChildren && ((deco & UNDERLINE) || (deco & OVERLINE))) || (paintedChildren && (deco & LINE_THROUGH))) &&
+shouldDrawTextDecoration(object())) {
+int x = m_x + borderLeft() + paddingLeft();
+int w = m_width - (borderLeft() + paddingLeft() + borderRight() + paddingRight());
+RootInlineBox* rootLine = root();
+if (rootLine->ellipsisBox()) {
+int ellipsisX = rootLine->ellipsisBox()->xPos();
+int ellipsisWidth = rootLine->ellipsisBox()->width();
+// FIXME: Will need to work with RTL
+if (rootLine == this) {
+if (x + w >= ellipsisX + ellipsisWidth)
+w -= (x + w - ellipsisX - ellipsisWidth);
+} else {
+if (x >= ellipsisX)
+return;
+if (x + w >= ellipsisX)
+w -= (x + w - ellipsisX);
+}
+}
+// Set up the appropriate text-shadow effect for the decoration.
+// FIXME: Support multiple shadow effects.  Need more from the CG API before we can do this.
+bool setShadow = false;
+if (styleToUse->textShadow()) {
+context->setShadow(IntSize(styleToUse->textShadow()->x, styleToUse->textShadow()->y),
+styleToUse->textShadow()->blur, styleToUse->textShadow()->color);
+setShadow = true;
+}
+// We must have child boxes and have decorations defined.
+tx += borderLeft() + paddingLeft();
+Color underline, overline, linethrough;
+underline = overline = linethrough = styleToUse->color();
+if (!parent())
+object()->getTextDecorationColors(deco, underline, overline, linethrough);
+if (styleToUse->font() != context->font())
+context->setFont(styleToUse->font());
+bool isPrinting = object()->document()->printing();
+context->setStrokeThickness(1.0f); // FIXME: We should improve this rule and not always just assume 1.
+if (deco & UNDERLINE && !paintedChildren) {
+context->setStrokeColor(underline);
+// Leave one pixel of white between the baseline and the underline.
+context->drawLineForText(IntPoint(tx, ty + m_baseline + 1), w, isPrinting);
+}
+if (deco & OVERLINE && !paintedChildren) {
+context->setStrokeColor(overline);
+context->drawLineForText(IntPoint(tx, ty), w, isPrinting);
+}
+if (deco & LINE_THROUGH && paintedChildren) {
+context->setStrokeColor(linethrough);
+context->drawLineForText(IntPoint(tx, ty + 2 * m_baseline / 3), w, isPrinting);
+}
+if (setShadow)
+context->clearShadow();
+}
+}
+InlineBox* InlineFlowBox::firstLeafChild()
+{
+return firstLeafChildAfterBox();
+}
+InlineBox* InlineFlowBox::lastLeafChild()
+{
+return lastLeafChildBeforeBox();
+}
+InlineBox* InlineFlowBox::firstLeafChildAfterBox(InlineBox* start)
+{
+InlineBox* leaf = 0;
+for (InlineBox* box = start ? start->nextOnLine() : firstChild(); box && !leaf; box = box->nextOnLine())
+leaf = box->firstLeafChild();
+if (start && !leaf && parent())
+return parent()->firstLeafChildAfterBox(this);
+return leaf;
+}
+InlineBox* InlineFlowBox::lastLeafChildBeforeBox(InlineBox* start)
+{
+InlineBox* leaf = 0;
+for (InlineBox* box = start ? start->prevOnLine() : lastChild(); box && !leaf; box = box->prevOnLine())
+leaf = box->lastLeafChild();
+if (start && !leaf && parent())
+return parent()->lastLeafChildBeforeBox(this);
+return leaf;
+}
+RenderObject::SelectionState InlineFlowBox::selectionState()
+{
+return RenderObject::SelectionNone;
+}
+bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth)
+{
+for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
+if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
+return false;
+}
+return true;
+}
+int InlineFlowBox::placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool& foundBox)
+{
+int result = -1;
+for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
+int currResult = box->placeEllipsisBox(ltr, blockEdge, ellipsisWidth, foundBox);
+if (currResult != -1 && result == -1)
+result = currResult;
+}
+return result;
+}
+void InlineFlowBox::clearTruncation()
+{
+for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
+box->clearTruncation();
+}
+#ifndef NDEBUG
+void InlineFlowBox::checkConsistency() const
+{
+#ifdef CHECK_CONSISTENCY
+ASSERT(!m_hasBadChildList);
+const InlineBox* prev = 0;
+for (const InlineBox* child = m_firstChild; child; child = child->nextOnLine()) {
+ASSERT(child->parent() == this);
+ASSERT(child->prevOnLine() == prev);
+prev = child;
+}
+ASSERT(prev == m_lastChild);
+#endif
+}
+#endif
+} // namespace WebCore