Source/WebCore/rendering/InlineFlowBox.cpp

   1 /*
   2  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "config.h"
  21 #include "InlineFlowBox.h"
  22
  23 #include "CachedImage.h"
  24 #include "CSSPropertyNames.h"
  25 #include "Document.h"
  26 #include "EllipsisBox.h"
  27 #include "GraphicsContext.h"
  28 #include "InlineTextBox.h"
  29 #include "HitTestResult.h"
  30 #include "RenderBlock.h"
  31 #include "RenderInline.h"
  32 #include "RenderLayer.h"
  33 #include "RenderListMarker.h"
  34 #include "RenderRubyBase.h"
  35 #include "RenderRubyRun.h"
  36 #include "RenderRubyText.h"
  37 #include "RenderTableCell.h"
  38 #include "RootInlineBox.h"
  39 #include "Text.h"
  40
  41 #include <math.h>
  42
  43 using namespace std;
  44
  45 namespace WebCore {
  46
  47 struct SameSizeAsInlineFlowBox : public InlineBox {
  48     void* pointers[5];
  49     uint32_t bitfields : 24;
  50 };
  51
  52 COMPILE_ASSERT(sizeof(InlineFlowBox) == sizeof(SameSizeAsInlineFlowBox), InlineFlowBox_should_stay_small);
  53
  54 #ifndef NDEBUG
  55
  56 InlineFlowBox::~InlineFlowBox()
  57 {
  58     if (!m_hasBadChildList)
  59         for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
  60             child->setHasBadParent();
  61 }
  62
  63 #endif
  64
  65 LayoutUnit InlineFlowBox::getFlowSpacingLogicalWidth()
  66 {
  67     LayoutUnit totWidth = marginBorderPaddingLogicalLeft() + marginBorderPaddingLogicalRight();
  68     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
  69         if (curr->isInlineFlowBox())
  70             totWidth += toInlineFlowBox(curr)->getFlowSpacingLogicalWidth();
  71     }
  72     return totWidth;
  73 }
  74
  75 IntRect InlineFlowBox::roundedFrameRect() const
  76 {
  77     // Begin by snapping the x and y coordinates to the nearest pixel.
  78     int snappedX = lroundf(x());
  79     int snappedY = lroundf(y());
  80
  81     int snappedMaxX = lroundf(x() + width());
  82     int snappedMaxY = lroundf(y() + height());
  83
  84     return IntRect(snappedX, snappedY, snappedMaxX - snappedX, snappedMaxY - snappedY);
  85 }
  86
  87 static void setHasTextDescendantsOnAncestors(InlineFlowBox* box)
  88 {
  89     while (box && !box->hasTextDescendants()) {
  90         box->setHasTextDescendants();
  91         box = box->parent();
  92     }
  93 }
  94
  95 void InlineFlowBox::addToLine(InlineBox* child)
  96 {
  97     ASSERT(!child->parent());
  98     ASSERT(!child->nextOnLine());
  99     ASSERT(!child->prevOnLine());
 100     checkConsistency();
 101
 102     child->setParent(this);
 103     if (!m_firstChild) {
 104         m_firstChild = child;
 105         m_lastChild = child;
 106     } else {
 107         m_lastChild->setNextOnLine(child);
 108         child->setPrevOnLine(m_lastChild);
 109         m_lastChild = child;
 110     }
 111     child->setFirstLineStyleBit(isFirstLineStyle());
 112     child->setIsHorizontal(isHorizontal());
 113     if (child->isText()) {
 114         if (child->renderer()->parent() == renderer())
 115             m_hasTextChildren = true;
 116         setHasTextDescendantsOnAncestors(this);
 117     } else if (child->isInlineFlowBox()) {
 118         if (toInlineFlowBox(child)->hasTextDescendants())
 119             setHasTextDescendantsOnAncestors(this);
 120     }
 121
 122     if (descendantsHaveSameLineHeightAndBaseline() && !child->renderer()->isOutOfFlowPositioned()) {
 123         RenderStyle* parentStyle = renderer()->style(isFirstLineStyle());
 124         RenderStyle* childStyle = child->renderer()->style(isFirstLineStyle());
 125         bool shouldClearDescendantsHaveSameLineHeightAndBaseline = false;
 126         if (child->renderer()->isReplaced())
 127             shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 128         else if (child->isText()) {
 129             if (child->renderer()->isBR() || child->renderer()->parent() != renderer()) {
 130                 if (!parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 131                     || parentStyle->lineHeight() != childStyle->lineHeight()
 132                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE)
 133                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 134             }
 135             if (childStyle->hasTextCombine() || childStyle->textEmphasisMark() != TextEmphasisMarkNone)
 136                 shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 137         } else {
 138             if (child->renderer()->isBR()) {
 139                 // FIXME: This is dumb. We only turn off because current layout test results expect the <br> to be 0-height on the baseline.
 140                 // Other than making a zillion tests have to regenerate results, there's no reason to ditch the optimization here.
 141                 shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 142             } else {
 143                 ASSERT(isInlineFlowBox());
 144                 InlineFlowBox* childFlowBox = toInlineFlowBox(child);
 145                 // Check the child's bit, and then also check for differences in font, line-height, vertical-align
 146                 if (!childFlowBox->descendantsHaveSameLineHeightAndBaseline()
 147                     || !parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 148                     || parentStyle->lineHeight() != childStyle->lineHeight()
 149                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE
 150                     || childStyle->hasBorder() || childStyle->hasPadding() || childStyle->hasTextCombine())
 151                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 152             }
 153         }
 154
 155         if (shouldClearDescendantsHaveSameLineHeightAndBaseline)
 156             clearDescendantsHaveSameLineHeightAndBaseline();
 157     }
 158
 159     if (!child->renderer()->isOutOfFlowPositioned()) {
 160         if (child->isText()) {
 161             RenderStyle* childStyle = child->renderer()->style(isFirstLineStyle());
 162             if (childStyle->letterSpacing() < 0 || childStyle->textShadow() || childStyle->textEmphasisMark() != TextEmphasisMarkNone || childStyle->textStrokeWidth())
 163                 child->clearKnownToHaveNoOverflow();
 164         } else if (child->renderer()->isReplaced()) {
 165             RenderBox* box = toRenderBox(child->renderer());
 166             if (box->hasRenderOverflow() || box->hasSelfPaintingLayer())
 167                 child->clearKnownToHaveNoOverflow();
 168         } else if (!child->renderer()->isBR() && (child->renderer()->style(isFirstLineStyle())->boxShadow() || child->boxModelObject()->hasSelfPaintingLayer()
 169                    || (child->renderer()->isListMarker() && !toRenderListMarker(child->renderer())->isInside())
 170                    || child->renderer()->style(isFirstLineStyle())->hasBorderImageOutsets()))
 171             child->clearKnownToHaveNoOverflow();
 172
 173         if (knownToHaveNoOverflow() && child->isInlineFlowBox() && !toInlineFlowBox(child)->knownToHaveNoOverflow())
 174             clearKnownToHaveNoOverflow();
 175     }
 176
 177     checkConsistency();
 178 }
 179
 180 void InlineFlowBox::removeChild(InlineBox* child)
 181 {
 182     checkConsistency();
 183
 184     if (!isDirty())
 185         dirtyLineBoxes();
 186
 187     root()->childRemoved(child);
 188
 189     if (child == m_firstChild)
 190         m_firstChild = child->nextOnLine();
 191     if (child == m_lastChild)
 192         m_lastChild = child->prevOnLine();
 193     if (child->nextOnLine())
 194         child->nextOnLine()->setPrevOnLine(child->prevOnLine());
 195     if (child->prevOnLine())
 196         child->prevOnLine()->setNextOnLine(child->nextOnLine());
 197
 198     child->setParent(0);
 199
 200     checkConsistency();
 201 }
 202
 203 void InlineFlowBox::deleteLine(RenderArena* arena)
 204 {
 205     InlineBox* child = firstChild();
 206     InlineBox* next = 0;
 207     while (child) {
 208         ASSERT(this == child->parent());
 209         next = child->nextOnLine();
 210 #ifndef NDEBUG
 211         child->setParent(0);
 212 #endif
 213         child->deleteLine(arena);
 214         child = next;
 215     }
 216 #ifndef NDEBUG
 217     m_firstChild = 0;
 218     m_lastChild = 0;
 219 #endif
 220
 221     removeLineBoxFromRenderObject();
 222     destroy(arena);
 223 }
 224
 225 void InlineFlowBox::removeLineBoxFromRenderObject()
 226 {
 227     toRenderInline(renderer())->lineBoxes()->removeLineBox(this);
 228 }
 229
 230 void InlineFlowBox::extractLine()
 231 {
 232     if (!extracted())
 233         extractLineBoxFromRenderObject();
 234     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 235         child->extractLine();
 236 }
 237
 238 void InlineFlowBox::extractLineBoxFromRenderObject()
 239 {
 240     toRenderInline(renderer())->lineBoxes()->extractLineBox(this);
 241 }
 242
 243 void InlineFlowBox::attachLine()
 244 {
 245     if (extracted())
 246         attachLineBoxToRenderObject();
 247     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 248         child->attachLine();
 249 }
 250
 251 void InlineFlowBox::attachLineBoxToRenderObject()
 252 {
 253     toRenderInline(renderer())->lineBoxes()->attachLineBox(this);
 254 }
 255
 256 void InlineFlowBox::adjustPosition(float dx, float dy)
 257 {
 258     InlineBox::adjustPosition(dx, dy);
 259     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 260         child->adjustPosition(dx, dy);
 261     if (m_overflow)
 262         m_overflow->move(dx, dy); // FIXME: Rounding error here since overflow was pixel snapped, but nobody other than list markers passes non-integral values here.
 263 }
 264
 265 RenderLineBoxList* InlineFlowBox::rendererLineBoxes() const
 266 {
 267     return toRenderInline(renderer())->lineBoxes();
 268 }
 269
 270 static inline bool isLastChildForRenderer(RenderObject* ancestor, RenderObject* child)
 271 {
 272     if (!child)
 273         return false;
 274
 275     if (child == ancestor)
 276         return true;
 277
 278     RenderObject* curr = child;
 279     RenderObject* parent = curr->parent();
 280     while (parent && (!parent->isRenderBlock() || parent->isInline())) {
 281         if (parent->lastChild() != curr)
 282             return false;
 283         if (parent == ancestor)
 284             return true;
 285
 286         curr = parent;
 287         parent = curr->parent();
 288     }
 289
 290     return true;
 291 }
 292
 293 static bool isAnsectorAndWithinBlock(RenderObject* ancestor, RenderObject* child)
 294 {
 295     RenderObject* object = child;
 296     while (object && (!object->isRenderBlock() || object->isInline())) {
 297         if (object == ancestor)
 298             return true;
 299         object = object->parent();
 300     }
 301     return false;
 302 }
 303
 304 void InlineFlowBox::determineSpacingForFlowBoxes(bool lastLine, bool isLogicallyLastRunWrapped, RenderObject* logicallyLastRunRenderer)
 305 {
 306     // All boxes start off open.  They will not apply any margins/border/padding on
 307     // any side.
 308     bool includeLeftEdge = false;
 309     bool includeRightEdge = false;
 310
 311     // The root inline box never has borders/margins/padding.
 312     if (parent()) {
 313         bool ltr = renderer()->style()->isLeftToRightDirection();
 314
 315         // Check to see if all initial lines are unconstructed.  If so, then
 316         // we know the inline began on this line (unless we are a continuation).
 317         RenderLineBoxList* lineBoxList = rendererLineBoxes();
 318         if (!lineBoxList->firstLineBox()->isConstructed() && !renderer()->isInlineElementContinuation()) {
 319 #if ENABLE(CSS_BOX_DECORATION_BREAK)
 320             if (renderer()->style()->boxDecorationBreak() == DCLONE)
 321                 includeLeftEdge = includeRightEdge = true;
 322             else
 323 #endif
 324             if (ltr && lineBoxList->firstLineBox() == this)
 325                 includeLeftEdge = true;
 326             else if (!ltr && lineBoxList->lastLineBox() == this)
 327                 includeRightEdge = true;
 328         }
 329
 330         if (!lineBoxList->lastLineBox()->isConstructed()) {
 331             RenderInline* inlineFlow = toRenderInline(renderer());
 332             bool isLastObjectOnLine = !isAnsectorAndWithinBlock(renderer(), logicallyLastRunRenderer) || (isLastChildForRenderer(renderer(), logicallyLastRunRenderer) && !isLogicallyLastRunWrapped);
 333
 334             // We include the border under these conditions:
 335             // (1) The next line was not created, or it is constructed. We check the previous line for rtl.
 336             // (2) The logicallyLastRun is not a descendant of this renderer.
 337             // (3) The logicallyLastRun is a descendant of this renderer, but it is the last child of this renderer and it does not wrap to the next line.
 338 #if ENABLE(CSS_BOX_DECORATION_BREAK)
 339             // (4) The decoration break is set to clone therefore there will be borders on every sides.
 340             if (renderer()->style()->boxDecorationBreak() == DCLONE)
 341                 includeLeftEdge = includeRightEdge = true;
 342             else
 343 #endif
 344             if (ltr) {
 345                 if (!nextLineBox()
 346                     && ((lastLine || isLastObjectOnLine) && !inlineFlow->continuation()))
 347                     includeRightEdge = true;
 348             } else {
 349                 if ((!prevLineBox() || prevLineBox()->isConstructed())
 350                     && ((lastLine || isLastObjectOnLine) && !inlineFlow->continuation()))
 351                     includeLeftEdge = true;
 352             }
 353         }
 354     }
 355
 356     setEdges(includeLeftEdge, includeRightEdge);
 357
 358     // Recur into our children.
 359     for (InlineBox* currChild = firstChild(); currChild; currChild = currChild->nextOnLine()) {
 360         if (currChild->isInlineFlowBox()) {
 361             InlineFlowBox* currFlow = toInlineFlowBox(currChild);
 362             currFlow->determineSpacingForFlowBoxes(lastLine, isLogicallyLastRunWrapped, logicallyLastRunRenderer);
 363         }
 364     }
 365 }
 366
 367 float InlineFlowBox::placeBoxesInInlineDirection(float logicalLeft, bool& needsWordSpacing, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 368 {
 369     // Set our x position.
 370     setLogicalLeft(logicalLeft);
 371
 372     float startLogicalLeft = logicalLeft;
 373     logicalLeft += borderLogicalLeft() + paddingLogicalLeft();
 374
 375     float minLogicalLeft = startLogicalLeft;
 376     float maxLogicalRight = logicalLeft;
 377
 378     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 379         if (curr->renderer()->isText()) {
 380             InlineTextBox* text = toInlineTextBox(curr);
 381             RenderText* rt = toRenderText(text->renderer());
 382             if (rt->textLength()) {
 383                 if (needsWordSpacing && isSpaceOrNewline(rt->characters()[text->start()]))
 384                     logicalLeft += rt->style(isFirstLineStyle())->font().wordSpacing();
 385                 needsWordSpacing = !isSpaceOrNewline(rt->characters()[text->end()]);
 386             }
 387             text->setLogicalLeft(logicalLeft);
 388             if (knownToHaveNoOverflow())
 389                 minLogicalLeft = min(logicalLeft, minLogicalLeft);
 390             logicalLeft += text->logicalWidth();
 391             if (knownToHaveNoOverflow())
 392                 maxLogicalRight = max(logicalLeft, maxLogicalRight);
 393         } else {
 394             if (curr->renderer()->isOutOfFlowPositioned()) {
 395                 if (curr->renderer()->parent()->style()->isLeftToRightDirection())
 396                     curr->setLogicalLeft(logicalLeft);
 397                 else
 398                     // Our offset that we cache needs to be from the edge of the right border box and
 399                     // not the left border box.  We have to subtract |x| from the width of the block
 400                     // (which can be obtained from the root line box).
 401                     curr->setLogicalLeft(root()->block()->logicalWidth() - logicalLeft);
 402                 continue; // The positioned object has no effect on the width.
 403             }
 404             if (curr->renderer()->isRenderInline()) {
 405                 InlineFlowBox* flow = toInlineFlowBox(curr);
 406                 logicalLeft += flow->marginLogicalLeft();
 407                 if (knownToHaveNoOverflow())
 408                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 409                 logicalLeft = flow->placeBoxesInInlineDirection(logicalLeft, needsWordSpacing, textBoxDataMap);
 410                 if (knownToHaveNoOverflow())
 411                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 412                 logicalLeft += flow->marginLogicalRight();
 413             } else if (!curr->renderer()->isListMarker() || toRenderListMarker(curr->renderer())->isInside()) {
 414                 // The box can have a different writing-mode than the overall line, so this is a bit complicated.
 415                 // Just get all the physical margin and overflow values by hand based off |isVertical|.
 416                 LayoutUnit logicalLeftMargin = isHorizontal() ? curr->boxModelObject()->marginLeft() : curr->boxModelObject()->marginTop();
 417                 LayoutUnit logicalRightMargin = isHorizontal() ? curr->boxModelObject()->marginRight() : curr->boxModelObject()->marginBottom();
 418
 419                 logicalLeft += logicalLeftMargin;
 420                 curr->setLogicalLeft(logicalLeft);
 421                 if (knownToHaveNoOverflow())
 422                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 423                 logicalLeft += curr->logicalWidth();
 424                 if (knownToHaveNoOverflow())
 425                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 426                 logicalLeft += logicalRightMargin;
 427             }
 428         }
 429     }
 430
 431     logicalLeft += borderLogicalRight() + paddingLogicalRight();
 432     setLogicalWidth(logicalLeft - startLogicalLeft);
 433     if (knownToHaveNoOverflow() && (minLogicalLeft < startLogicalLeft || maxLogicalRight > logicalLeft))
 434         clearKnownToHaveNoOverflow();
 435     return logicalLeft;
 436 }
 437
 438 bool InlineFlowBox::requiresIdeographicBaseline(const GlyphOverflowAndFallbackFontsMap& textBoxDataMap) const
 439 {
 440     if (isHorizontal())
 441         return false;
 442
 443     if (renderer()->style(isFirstLineStyle())->fontDescription().textOrientation() == TextOrientationUpright
 444         || renderer()->style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 445         return true;
 446
 447     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 448         if (curr->renderer()->isOutOfFlowPositioned())
 449             continue; // Positioned placeholders don't affect calculations.
 450
 451         if (curr->isInlineFlowBox()) {
 452             if (toInlineFlowBox(curr)->requiresIdeographicBaseline(textBoxDataMap))
 453                 return true;
 454         } else {
 455             if (curr->renderer()->style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 456                 return true;
 457
 458             const Vector<const SimpleFontData*>* usedFonts = 0;
 459             if (curr->isInlineTextBox()) {
 460                 GlyphOverflowAndFallbackFontsMap::const_iterator it = textBoxDataMap.find(toInlineTextBox(curr));
 461                 usedFonts = it == textBoxDataMap.end() ? 0 : &it->second.first;
 462             }
 463
 464             if (usedFonts) {
 465                 for (size_t i = 0; i < usedFonts->size(); ++i) {
 466                     if (usedFonts->at(i)->hasVerticalGlyphs())
 467                         return true;
 468                 }
 469             }
 470         }
 471     }
 472
 473     return false;
 474 }
 475
 476 void InlineFlowBox::adjustMaxAscentAndDescent(LayoutUnit& maxAscent, LayoutUnit& maxDescent, LayoutUnit maxPositionTop, LayoutUnit maxPositionBottom)
 477 {
 478     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 479         // The computed lineheight needs to be extended for the
 480         // positioned elements
 481         if (curr->renderer()->isOutOfFlowPositioned())
 482             continue; // Positioned placeholders don't affect calculations.
 483         if (curr->verticalAlign() == TOP || curr->verticalAlign() == BOTTOM) {
 484             LayoutUnit lineHeight = curr->lineHeight();
 485             if (curr->verticalAlign() == TOP) {
 486                 if (maxAscent + maxDescent < lineHeight)
 487                     maxDescent = lineHeight - maxAscent;
 488             }
 489             else {
 490                 if (maxAscent + maxDescent < lineHeight)
 491                     maxAscent = lineHeight - maxDescent;
 492             }
 493
 494             if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
 495                 break;
 496         }
 497
 498         if (curr->isInlineFlowBox())
 499             toInlineFlowBox(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
 500     }
 501 }
 502
 503 void InlineFlowBox::computeLogicalBoxHeights(RootInlineBox* rootBox, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom,
 504                                              LayoutUnit& maxAscent, LayoutUnit& maxDescent, bool& setMaxAscent, bool& setMaxDescent,
 505                                              bool strictMode, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
 506                                              FontBaseline baselineType, VerticalPositionCache& verticalPositionCache)
 507 {
 508     // The primary purpose of this function is to compute the maximal ascent and descent values for
 509     // a line. These values are computed based off the block's line-box-contain property, which indicates
 510     // what parts of descendant boxes have to fit within the line.
 511     //
 512     // The maxAscent value represents the distance of the highest point of any box (typically including line-height) from
 513     // the root box's baseline. The maxDescent value represents the distance of the lowest point of any box
 514     // (also typically including line-height) from the root box baseline. These values can be negative.
 515     //
 516     // A secondary purpose of this function is to store the offset of every box's baseline from the root box's
 517     // baseline. This information is cached in the logicalTop() of every box. We're effectively just using
 518     // the logicalTop() as scratch space.
 519     //
 520     // Because a box can be positioned such that it ends up fully above or fully below the
 521     // root line box, we only consider it to affect the maxAscent and maxDescent values if some
 522     // part of the box (EXCLUDING leading) is above (for ascent) or below (for descent) the root box's baseline.
 523     bool affectsAscent = false;
 524     bool affectsDescent = false;
 525     bool checkChildren = !descendantsHaveSameLineHeightAndBaseline();
 526
 527     if (isRootInlineBox()) {
 528         // Examine our root box.
 529         int ascent = 0;
 530         int descent = 0;
 531         rootBox->ascentAndDescentForBox(rootBox, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 532         if (strictMode || hasTextChildren() || (!checkChildren && hasTextDescendants())) {
 533             if (maxAscent < ascent || !setMaxAscent) {
 534                 maxAscent = ascent;
 535                 setMaxAscent = true;
 536             }
 537             if (maxDescent < descent || !setMaxDescent) {
 538                 maxDescent = descent;
 539                 setMaxDescent = true;
 540             }
 541         }
 542     }
 543
 544     if (!checkChildren)
 545         return;
 546
 547     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 548         if (curr->renderer()->isOutOfFlowPositioned())
 549             continue; // Positioned placeholders don't affect calculations.
 550
 551         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 552
 553         bool affectsAscent = false;
 554         bool affectsDescent = false;
 555
 556         // The verticalPositionForBox function returns the distance between the child box's baseline
 557         // and the root box's baseline.  The value is negative if the child box's baseline is above the
 558         // root box's baseline, and it is positive if the child box's baseline is below the root box's baseline.
 559         curr->setLogicalTop(rootBox->verticalPositionForBox(curr, verticalPositionCache));
 560
 561         int ascent = 0;
 562         int descent = 0;
 563         rootBox->ascentAndDescentForBox(curr, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 564
 565         LayoutUnit boxHeight = ascent + descent;
 566         if (curr->verticalAlign() == TOP) {
 567             if (maxPositionTop < boxHeight)
 568                 maxPositionTop = boxHeight;
 569         } else if (curr->verticalAlign() == BOTTOM) {
 570             if (maxPositionBottom < boxHeight)
 571                 maxPositionBottom = boxHeight;
 572         } else if (!inlineFlowBox || strictMode || inlineFlowBox->hasTextChildren() || (inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants())
 573                    || inlineFlowBox->boxModelObject()->hasInlineDirectionBordersOrPadding()) {
 574             // Note that these values can be negative.  Even though we only affect the maxAscent and maxDescent values
 575             // if our box (excluding line-height) was above (for ascent) or below (for descent) the root baseline, once you factor in line-height
 576             // the final box can end up being fully above or fully below the root box's baseline!  This is ok, but what it
 577             // means is that ascent and descent (including leading), can end up being negative.  The setMaxAscent and
 578             // setMaxDescent booleans are used to ensure that we're willing to initially set maxAscent/Descent to negative
 579             // values.
 580             ascent -= curr->logicalTop();
 581             descent += curr->logicalTop();
 582             if (affectsAscent && (maxAscent < ascent || !setMaxAscent)) {
 583                 maxAscent = ascent;
 584                 setMaxAscent = true;
 585             }
 586
 587             if (affectsDescent && (maxDescent < descent || !setMaxDescent)) {
 588                 maxDescent = descent;
 589                 setMaxDescent = true;
 590             }
 591         }
 592
 593         if (inlineFlowBox)
 594             inlineFlowBox->computeLogicalBoxHeights(rootBox, maxPositionTop, maxPositionBottom, maxAscent, maxDescent,
 595                                                     setMaxAscent, setMaxDescent, strictMode, textBoxDataMap,
 596                                                     baselineType, verticalPositionCache);
 597     }
 598 }
 599
 600 void InlineFlowBox::placeBoxesInBlockDirection(LayoutUnit top, LayoutUnit maxHeight, LayoutUnit maxAscent, bool strictMode, LayoutUnit& lineTop, LayoutUnit& lineBottom, bool& setLineTop,
 601                                                LayoutUnit& lineTopIncludingMargins, LayoutUnit& lineBottomIncludingMargins, bool& hasAnnotationsBefore, bool& hasAnnotationsAfter, FontBaseline baselineType)
 602 {
 603     bool isRootBox = isRootInlineBox();
 604     if (isRootBox) {
 605         const FontMetrics& fontMetrics = renderer()->style(isFirstLineStyle())->fontMetrics();
 606         // RootInlineBoxes are always placed on at pixel boundaries in their logical y direction. Not doing
 607         // so results in incorrect rendering of text decorations, most notably underlines.
 608         setLogicalTop(roundToInt(top + maxAscent - fontMetrics.ascent(baselineType)));
 609     }
 610
 611     LayoutUnit adjustmentForChildrenWithSameLineHeightAndBaseline = 0;
 612     if (descendantsHaveSameLineHeightAndBaseline()) {
 613         adjustmentForChildrenWithSameLineHeightAndBaseline = logicalTop();
 614         if (parent())
 615             adjustmentForChildrenWithSameLineHeightAndBaseline += (boxModelObject()->borderBefore() + boxModelObject()->paddingBefore());
 616     }
 617
 618     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 619         if (curr->renderer()->isOutOfFlowPositioned())
 620             continue; // Positioned placeholders don't affect calculations.
 621
 622         if (descendantsHaveSameLineHeightAndBaseline()) {
 623             curr->adjustBlockDirectionPosition(adjustmentForChildrenWithSameLineHeightAndBaseline);
 624             continue;
 625         }
 626
 627         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 628         bool childAffectsTopBottomPos = true;
 629         if (curr->verticalAlign() == TOP)
 630             curr->setLogicalTop(top);
 631         else if (curr->verticalAlign() == BOTTOM)
 632             curr->setLogicalTop(top + maxHeight - curr->lineHeight());
 633         else {
 634             if (!strictMode && inlineFlowBox && !inlineFlowBox->hasTextChildren() && !curr->boxModelObject()->hasInlineDirectionBordersOrPadding()
 635                 && !(inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants()))
 636                 childAffectsTopBottomPos = false;
 637             LayoutUnit posAdjust = maxAscent - curr->baselinePosition(baselineType);
 638             curr->setLogicalTop(curr->logicalTop() + top + posAdjust);
 639         }
 640
 641         LayoutUnit newLogicalTop = curr->logicalTop();
 642         LayoutUnit newLogicalTopIncludingMargins = newLogicalTop;
 643         LayoutUnit boxHeight = curr->logicalHeight();
 644         LayoutUnit boxHeightIncludingMargins = boxHeight;
 645
 646         if (curr->isText() || curr->isInlineFlowBox()) {
 647             const FontMetrics& fontMetrics = curr->renderer()->style(isFirstLineStyle())->fontMetrics();
 648             newLogicalTop += curr->baselinePosition(baselineType) - fontMetrics.ascent(baselineType);
 649             if (curr->isInlineFlowBox()) {
 650                 RenderBoxModelObject* boxObject = toRenderBoxModelObject(curr->renderer());
 651                 newLogicalTop -= boxObject->style(isFirstLineStyle())->isHorizontalWritingMode() ? boxObject->borderTop() + boxObject->paddingTop() :
 652                                  boxObject->borderRight() + boxObject->paddingRight();
 653             }
 654             newLogicalTopIncludingMargins = newLogicalTop;
 655         } else if (!curr->renderer()->isBR()) {
 656             RenderBox* box = toRenderBox(curr->renderer());
 657             newLogicalTopIncludingMargins = newLogicalTop;
 658             LayoutUnit overSideMargin = curr->isHorizontal() ? box->marginTop() : box->marginRight();
 659             LayoutUnit underSideMargin = curr->isHorizontal() ? box->marginBottom() : box->marginLeft();
 660             newLogicalTop += overSideMargin;
 661             boxHeightIncludingMargins += overSideMargin + underSideMargin;
 662         }
 663
 664         curr->setLogicalTop(newLogicalTop);
 665
 666         if (childAffectsTopBottomPos) {
 667             if (curr->renderer()->isRubyRun()) {
 668                 // Treat the leading on the first and last lines of ruby runs as not being part of the overall lineTop/lineBottom.
 669                 // Really this is a workaround hack for the fact that ruby should have been done as line layout and not done using
 670                 // inline-block.
 671                 if (!renderer()->style()->isFlippedLinesWritingMode())
 672                     hasAnnotationsBefore = true;
 673                 else
 674                     hasAnnotationsAfter = true;
 675
 676                 RenderRubyRun* rubyRun = toRenderRubyRun(curr->renderer());
 677                 if (RenderRubyBase* rubyBase = rubyRun->rubyBase()) {
 678                     LayoutUnit bottomRubyBaseLeading = (curr->logicalHeight() - rubyBase->logicalBottom()) + rubyBase->logicalHeight() - (rubyBase->lastRootBox() ? rubyBase->lastRootBox()->lineBottom() : ZERO_LAYOUT_UNIT);
 679                     LayoutUnit topRubyBaseLeading = rubyBase->logicalTop() + (rubyBase->firstRootBox() ? rubyBase->firstRootBox()->lineTop() : ZERO_LAYOUT_UNIT);
 680                     newLogicalTop += !renderer()->style()->isFlippedLinesWritingMode() ? topRubyBaseLeading : bottomRubyBaseLeading;
 681                     boxHeight -= (topRubyBaseLeading + bottomRubyBaseLeading);
 682                 }
 683             }
 684             if (curr->isInlineTextBox()) {
 685                 TextEmphasisPosition emphasisMarkPosition;
 686                 if (toInlineTextBox(curr)->getEmphasisMarkPosition(curr->renderer()->style(isFirstLineStyle()), emphasisMarkPosition)) {
 687                     bool emphasisMarkIsOver = emphasisMarkPosition == TextEmphasisPositionOver;
 688                     if (emphasisMarkIsOver != curr->renderer()->style(isFirstLineStyle())->isFlippedLinesWritingMode())
 689                         hasAnnotationsBefore = true;
 690                     else
 691                         hasAnnotationsAfter = true;
 692                 }
 693             }
 694
 695             if (!setLineTop) {
 696                 setLineTop = true;
 697                 lineTop = newLogicalTop;
 698                 lineTopIncludingMargins = min(lineTop, newLogicalTopIncludingMargins);
 699             } else {
 700                 lineTop = min(lineTop, newLogicalTop);
 701                 lineTopIncludingMargins = min(lineTop, min(lineTopIncludingMargins, newLogicalTopIncludingMargins));
 702             }
 703             lineBottom = max(lineBottom, newLogicalTop + boxHeight);
 704             lineBottomIncludingMargins = max(lineBottom, max(lineBottomIncludingMargins, newLogicalTopIncludingMargins + boxHeightIncludingMargins));
 705         }
 706
 707         // Adjust boxes to use their real box y/height and not the logical height (as dictated by
 708         // line-height).
 709         if (inlineFlowBox)
 710             inlineFlowBox->placeBoxesInBlockDirection(top, maxHeight, maxAscent, strictMode, lineTop, lineBottom, setLineTop,
 711                                                       lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType);
 712     }
 713
 714     if (isRootBox) {
 715         if (strictMode || hasTextChildren() || (descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
 716             if (!setLineTop) {
 717                 setLineTop = true;
 718                 lineTop = pixelSnappedLogicalTop();
 719                 lineTopIncludingMargins = lineTop;
 720             } else {
 721                 lineTop = min<LayoutUnit>(lineTop, pixelSnappedLogicalTop());
 722                 lineTopIncludingMargins = min(lineTop, lineTopIncludingMargins);
 723             }
 724             lineBottom = max<LayoutUnit>(lineBottom, pixelSnappedLogicalBottom());
 725             lineBottomIncludingMargins = max(lineBottom, lineBottomIncludingMargins);
 726         }
 727
 728         if (renderer()->style()->isFlippedLinesWritingMode())
 729             flipLinesInBlockDirection(lineTopIncludingMargins, lineBottomIncludingMargins);
 730     }
 731 }
 732
 733 void InlineFlowBox::flipLinesInBlockDirection(LayoutUnit lineTop, LayoutUnit lineBottom)
 734 {
 735     // Flip the box on the line such that the top is now relative to the lineBottom instead of the lineTop.
 736     setLogicalTop(lineBottom - (logicalTop() - lineTop) - logicalHeight());
 737
 738     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 739         if (curr->renderer()->isOutOfFlowPositioned())
 740             continue; // Positioned placeholders aren't affected here.
 741
 742         if (curr->isInlineFlowBox())
 743             toInlineFlowBox(curr)->flipLinesInBlockDirection(lineTop, lineBottom);
 744         else
 745             curr->setLogicalTop(lineBottom - (curr->logicalTop() - lineTop) - curr->logicalHeight());
 746     }
 747 }
 748
 749 inline void InlineFlowBox::addBoxShadowVisualOverflow(LayoutRect& logicalVisualOverflow)
 750 {
 751     // box-shadow on root line boxes is applying to the block and not to the lines.
 752     if (!parent())
 753         return;
 754
 755     RenderStyle* style = renderer()->style(isFirstLineStyle());
 756     if (!style->boxShadow())
 757         return;
 758
 759     LayoutUnit boxShadowLogicalTop;
 760     LayoutUnit boxShadowLogicalBottom;
 761     style->getBoxShadowBlockDirectionExtent(boxShadowLogicalTop, boxShadowLogicalBottom);
 762
 763     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite shadow that applies, since
 764     // the line is "upside down" in terms of block coordinates.
 765     LayoutUnit shadowLogicalTop = style->isFlippedLinesWritingMode() ? -boxShadowLogicalBottom : boxShadowLogicalTop;
 766     LayoutUnit shadowLogicalBottom = style->isFlippedLinesWritingMode() ? -boxShadowLogicalTop : boxShadowLogicalBottom;
 767
 768     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() + shadowLogicalTop, logicalVisualOverflow.y());
 769     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + shadowLogicalBottom, logicalVisualOverflow.maxY());
 770
 771     LayoutUnit boxShadowLogicalLeft;
 772     LayoutUnit boxShadowLogicalRight;
 773     style->getBoxShadowInlineDirectionExtent(boxShadowLogicalLeft, boxShadowLogicalRight);
 774
 775     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() + boxShadowLogicalLeft, logicalVisualOverflow.x());
 776     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + boxShadowLogicalRight, logicalVisualOverflow.maxX());
 777
 778     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 779                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 780 }
 781
 782 inline void InlineFlowBox::addBorderOutsetVisualOverflow(LayoutRect& logicalVisualOverflow)
 783 {
 784     // border-image-outset on root line boxes is applying to the block and not to the lines.
 785     if (!parent())
 786         return;
 787
 788     RenderStyle* style = renderer()->style(isFirstLineStyle());
 789     if (!style->hasBorderImageOutsets())
 790         return;
 791
 792     FractionalLayoutBoxExtent borderOutsets = style->borderImageOutsets();
 793
 794     LayoutUnit borderOutsetLogicalTop = borderOutsets.logicalTop(style->writingMode());
 795     LayoutUnit borderOutsetLogicalBottom = borderOutsets.logicalBottom(style->writingMode());
 796     LayoutUnit borderOutsetLogicalLeft = borderOutsets.logicalLeft(style->writingMode());
 797     LayoutUnit borderOutsetLogicalRight = borderOutsets.logicalRight(style->writingMode());
 798
 799     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite border that applies, since
 800     // the line is "upside down" in terms of block coordinates. vertical-rl and horizontal-bt are the flipped line modes.
 801     LayoutUnit outsetLogicalTop = style->isFlippedLinesWritingMode() ? borderOutsetLogicalBottom : borderOutsetLogicalTop;
 802     LayoutUnit outsetLogicalBottom = style->isFlippedLinesWritingMode() ? borderOutsetLogicalTop : borderOutsetLogicalBottom;
 803
 804     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() - outsetLogicalTop, logicalVisualOverflow.y());
 805     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + outsetLogicalBottom, logicalVisualOverflow.maxY());
 806
 807     LayoutUnit outsetLogicalLeft = includeLogicalLeftEdge() ? borderOutsetLogicalLeft : ZERO_LAYOUT_UNIT;
 808     LayoutUnit outsetLogicalRight = includeLogicalRightEdge() ? borderOutsetLogicalRight : ZERO_LAYOUT_UNIT;
 809
 810     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() - outsetLogicalLeft, logicalVisualOverflow.x());
 811     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + outsetLogicalRight, logicalVisualOverflow.maxX());
 812
 813     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 814                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 815 }
 816
 817 inline void InlineFlowBox::addTextBoxVisualOverflow(InlineTextBox* textBox, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, LayoutRect& logicalVisualOverflow)
 818 {
 819     if (textBox->knownToHaveNoOverflow())
 820         return;
 821
 822     RenderStyle* style = textBox->renderer()->style(isFirstLineStyle());
 823
 824     GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(textBox);
 825     GlyphOverflow* glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->second.second;
 826     bool isFlippedLine = style->isFlippedLinesWritingMode();
 827
 828     int topGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->bottom : glyphOverflow->top) : 0;
 829     int bottomGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->top : glyphOverflow->bottom) : 0;
 830     int leftGlyphEdge = glyphOverflow ? glyphOverflow->left : 0;
 831     int rightGlyphEdge = glyphOverflow ? glyphOverflow->right : 0;
 832
 833     int strokeOverflow = static_cast<int>(ceilf(style->textStrokeWidth() / 2.0f));
 834     int topGlyphOverflow = -strokeOverflow - topGlyphEdge;
 835     int bottomGlyphOverflow = strokeOverflow + bottomGlyphEdge;
 836     int leftGlyphOverflow = -strokeOverflow - leftGlyphEdge;
 837     int rightGlyphOverflow = strokeOverflow + rightGlyphEdge;
 838
 839     TextEmphasisPosition emphasisMarkPosition;
 840     if (style->textEmphasisMark() != TextEmphasisMarkNone && textBox->getEmphasisMarkPosition(style, emphasisMarkPosition)) {
 841         int emphasisMarkHeight = style->font().emphasisMarkHeight(style->textEmphasisMarkString());
 842         if ((emphasisMarkPosition == TextEmphasisPositionOver) == (!style->isFlippedLinesWritingMode()))
 843             topGlyphOverflow = min(topGlyphOverflow, -emphasisMarkHeight);
 844         else
 845             bottomGlyphOverflow = max(bottomGlyphOverflow, emphasisMarkHeight);
 846     }
 847
 848     // If letter-spacing is negative, we should factor that into right layout overflow. (Even in RTL, letter-spacing is
 849     // applied to the right, so this is not an issue with left overflow.
 850     rightGlyphOverflow -= min(0, (int)style->font().letterSpacing());
 851
 852     LayoutUnit textShadowLogicalTop;
 853     LayoutUnit textShadowLogicalBottom;
 854     style->getTextShadowBlockDirectionExtent(textShadowLogicalTop, textShadowLogicalBottom);
 855
 856     LayoutUnit childOverflowLogicalTop = min<LayoutUnit>(textShadowLogicalTop + topGlyphOverflow, topGlyphOverflow);
 857     LayoutUnit childOverflowLogicalBottom = max<LayoutUnit>(textShadowLogicalBottom + bottomGlyphOverflow, bottomGlyphOverflow);
 858
 859     LayoutUnit textShadowLogicalLeft;
 860     LayoutUnit textShadowLogicalRight;
 861     style->getTextShadowInlineDirectionExtent(textShadowLogicalLeft, textShadowLogicalRight);
 862
 863     LayoutUnit childOverflowLogicalLeft = min<LayoutUnit>(textShadowLogicalLeft + leftGlyphOverflow, leftGlyphOverflow);
 864     LayoutUnit childOverflowLogicalRight = max<LayoutUnit>(textShadowLogicalRight + rightGlyphOverflow, rightGlyphOverflow);
 865
 866     LayoutUnit logicalTopVisualOverflow = min(textBox->pixelSnappedLogicalTop() + childOverflowLogicalTop, logicalVisualOverflow.y());
 867     LayoutUnit logicalBottomVisualOverflow = max(textBox->pixelSnappedLogicalBottom() + childOverflowLogicalBottom, logicalVisualOverflow.maxY());
 868     LayoutUnit logicalLeftVisualOverflow = min(textBox->pixelSnappedLogicalLeft() + childOverflowLogicalLeft, logicalVisualOverflow.x());
 869     LayoutUnit logicalRightVisualOverflow = max(textBox->pixelSnappedLogicalRight() + childOverflowLogicalRight, logicalVisualOverflow.maxX());
 870
 871     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 872                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 873
 874     textBox->setLogicalOverflowRect(logicalVisualOverflow);
 875 }
 876
 877 inline void InlineFlowBox::addReplacedChildOverflow(const InlineBox* inlineBox, LayoutRect& logicalLayoutOverflow, LayoutRect& logicalVisualOverflow)
 878 {
 879     RenderBox* box = toRenderBox(inlineBox->renderer());
 880
 881     // Visual overflow only propagates if the box doesn't have a self-painting layer.  This rectangle does not include
 882     // transforms or relative positioning (since those objects always have self-painting layers), but it does need to be adjusted
 883     // for writing-mode differences.
 884     if (!box->hasSelfPaintingLayer()) {
 885         LayoutRect childLogicalVisualOverflow = box->logicalVisualOverflowRectForPropagation(renderer()->style());
 886         childLogicalVisualOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 887         logicalVisualOverflow.unite(childLogicalVisualOverflow);
 888     }
 889
 890     // Layout overflow internal to the child box only propagates if the child box doesn't have overflow clip set.
 891     // Otherwise the child border box propagates as layout overflow.  This rectangle must include transforms and relative positioning
 892     // and be adjusted for writing-mode differences.
 893     LayoutRect childLogicalLayoutOverflow = box->logicalLayoutOverflowRectForPropagation(renderer()->style());
 894     childLogicalLayoutOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 895     logicalLayoutOverflow.unite(childLogicalLayoutOverflow);
 896 }
 897
 898 void InlineFlowBox::computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 899 {
 900     // If we know we have no overflow, we can just bail.
 901     if (knownToHaveNoOverflow())
 902         return;
 903
 904     // Visual overflow just includes overflow for stuff we need to repaint ourselves.  Self-painting layers are ignored.
 905     // Layout overflow is used to determine scrolling extent, so it still includes child layers and also factors in
 906     // transforms, relative positioning, etc.
 907     LayoutRect logicalLayoutOverflow(enclosingLayoutRect(logicalFrameRectIncludingLineHeight(lineTop, lineBottom)));
 908     LayoutRect logicalVisualOverflow(logicalLayoutOverflow);
 909
 910     addBoxShadowVisualOverflow(logicalVisualOverflow);
 911     addBorderOutsetVisualOverflow(logicalVisualOverflow);
 912
 913     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 914         if (curr->renderer()->isOutOfFlowPositioned())
 915             continue; // Positioned placeholders don't affect calculations.
 916
 917         if (curr->renderer()->isText()) {
 918             InlineTextBox* text = toInlineTextBox(curr);
 919             RenderText* rt = toRenderText(text->renderer());
 920             if (rt->isBR())
 921                 continue;
 922             LayoutRect textBoxOverflow(enclosingLayoutRect(text->logicalFrameRect()));
 923             addTextBoxVisualOverflow(text, textBoxDataMap, textBoxOverflow);
 924             logicalVisualOverflow.unite(textBoxOverflow);
 925         } else  if (curr->renderer()->isRenderInline()) {
 926             InlineFlowBox* flow = toInlineFlowBox(curr);
 927             flow->computeOverflow(lineTop, lineBottom, textBoxDataMap);
 928             if (!flow->boxModelObject()->hasSelfPaintingLayer())
 929                 logicalVisualOverflow.unite(flow->logicalVisualOverflowRect(lineTop, lineBottom));
 930             LayoutRect childLayoutOverflow = flow->logicalLayoutOverflowRect(lineTop, lineBottom);
 931             childLayoutOverflow.move(flow->boxModelObject()->relativePositionLogicalOffset());
 932             logicalLayoutOverflow.unite(childLayoutOverflow);
 933         } else
 934             addReplacedChildOverflow(curr, logicalLayoutOverflow, logicalVisualOverflow);
 935     }
 936
 937     setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, lineTop, lineBottom);
 938 }
 939
 940 void InlineFlowBox::setLayoutOverflow(const LayoutRect& rect, LayoutUnit lineTop, LayoutUnit lineBottom)
 941 {
 942     LayoutRect frameBox = enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
 943     if (frameBox.contains(rect) || rect.isEmpty())
 944         return;
 945
 946     if (!m_overflow)
 947         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 948
 949     m_overflow->setLayoutOverflow(rect);
 950 }
 951
 952 void InlineFlowBox::setVisualOverflow(const LayoutRect& rect, LayoutUnit lineTop, LayoutUnit lineBottom)
 953 {
 954     LayoutRect frameBox = enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
 955     if (frameBox.contains(rect) || rect.isEmpty())
 956         return;
 957
 958     if (!m_overflow)
 959         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 960
 961     m_overflow->setVisualOverflow(rect);
 962 }
 963
 964 void InlineFlowBox::setOverflowFromLogicalRects(const LayoutRect& logicalLayoutOverflow, const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom)
 965 {
 966     LayoutRect layoutOverflow(isHorizontal() ? logicalLayoutOverflow : logicalLayoutOverflow.transposedRect());
 967     setLayoutOverflow(layoutOverflow, lineTop, lineBottom);
 968
 969     LayoutRect visualOverflow(isHorizontal() ? logicalVisualOverflow : logicalVisualOverflow.transposedRect());
 970     setVisualOverflow(visualOverflow, lineTop, lineBottom);
 971 }
 972
 973 bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestPoint& pointInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 974 {
 975     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
 976     flipForWritingMode(overflowRect);
 977     overflowRect.moveBy(accumulatedOffset);
 978     if (!pointInContainer.intersects(overflowRect))
 979         return false;
 980
 981     // Check children first.
 982     for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {
 983         if ((curr->renderer()->isText() || !curr->boxModelObject()->hasSelfPaintingLayer()) && curr->nodeAtPoint(request, result, pointInContainer, accumulatedOffset, lineTop, lineBottom)) {
 984             renderer()->updateHitTestResult(result, pointInContainer.point() - toLayoutSize(accumulatedOffset));
 985             return true;
 986         }
 987     }
 988
 989     // Now check ourselves. Pixel snap hit testing.
 990     LayoutRect frameRect = roundedFrameRect();
 991     LayoutUnit minX = frameRect.x();
 992     LayoutUnit minY = frameRect.y();
 993     LayoutUnit width = frameRect.width();
 994     LayoutUnit height = frameRect.height();
 995
 996     // Constrain our hit testing to the line top and bottom if necessary.
 997     bool noQuirksMode = renderer()->document()->inNoQuirksMode();
 998     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
 999         RootInlineBox* rootBox = root();
1000         LayoutUnit& top = isHorizontal() ? minY : minX;
1001         LayoutUnit& logicalHeight = isHorizontal() ? height : width;
1002         LayoutUnit bottom = min(rootBox->lineBottom(), top + logicalHeight);
1003         top = max(rootBox->lineTop(), top);
1004         logicalHeight = bottom - top;
1005     }
1006
1007     // Move x/y to our coordinates.
1008     LayoutRect rect(minX, minY, width, height);
1009     flipForWritingMode(rect);
1010     rect.moveBy(accumulatedOffset);
1011
1012     if (visibleToHitTesting() && pointInContainer.intersects(rect)) {
1013         renderer()->updateHitTestResult(result, flipForWritingMode(pointInContainer.point() - toLayoutSize(accumulatedOffset))); // Don't add in m_x or m_y here, we want coords in the containing block's space.
1014         if (!result.addNodeToRectBasedTestResult(renderer()->node(), pointInContainer, rect))
1015             return true;
1016     }
1017
1018     return false;
1019 }
1020
1021 void InlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
1022 {
1023     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
1024     overflowRect.inflate(renderer()->maximalOutlineSize(paintInfo.phase));
1025     flipForWritingMode(overflowRect);
1026     overflowRect.moveBy(paintOffset);
1027
1028     if (!paintInfo.rect.intersects(pixelSnappedIntRect(overflowRect)))
1029         return;
1030
1031     if (paintInfo.phase != PaintPhaseChildOutlines) {
1032         if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) {
1033             // Add ourselves to the paint info struct's list of inlines that need to paint their
1034             // outlines.
1035             if (renderer()->style()->visibility() == VISIBLE && renderer()->hasOutline() && !isRootInlineBox()) {
1036                 RenderInline* inlineFlow = toRenderInline(renderer());
1037
1038                 RenderBlock* cb = 0;
1039                 bool containingBlockPaintsContinuationOutline = inlineFlow->continuation() || inlineFlow->isInlineElementContinuation();
1040                 if (containingBlockPaintsContinuationOutline) {
1041                     // FIXME: See https://bugs.webkit.org/show_bug.cgi?id=54690. We currently don't reconnect inline continuations
1042                     // after a child removal. As a result, those merged inlines do not get seperated and hence not get enclosed by
1043                     // anonymous blocks. In this case, it is better to bail out and paint it ourself.
1044                     RenderBlock* enclosingAnonymousBlock = renderer()->containingBlock();
1045                     if (!enclosingAnonymousBlock->isAnonymousBlock())
1046                         containingBlockPaintsContinuationOutline = false;
1047                     else {
1048                         cb = enclosingAnonymousBlock->containingBlock();
1049                         for (RenderBoxModelObject* box = boxModelObject(); box != cb; box = box->parent()->enclosingBoxModelObject()) {
1050                             if (box->hasSelfPaintingLayer()) {
1051                                 containingBlockPaintsContinuationOutline = false;
1052                                 break;
1053                             }
1054                         }
1055                     }
1056                 }
1057
1058                 if (containingBlockPaintsContinuationOutline) {
1059                     // Add ourselves to the containing block of the entire continuation so that it can
1060                     // paint us atomically.
1061                     cb->addContinuationWithOutline(toRenderInline(renderer()->node()->renderer()));
1062                 } else if (!inlineFlow->isInlineElementContinuation())
1063                     paintInfo.outlineObjects->add(inlineFlow);
1064             }
1065         } else if (paintInfo.phase == PaintPhaseMask) {
1066             paintMask(paintInfo, paintOffset);
1067             return;
1068         } else {
1069             // Paint our background, border and box-shadow.
1070             paintBoxDecorations(paintInfo, paintOffset);
1071         }
1072     }
1073
1074     if (paintInfo.phase == PaintPhaseMask)
1075         return;
1076
1077     PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
1078     PaintInfo childInfo(paintInfo);
1079     childInfo.phase = paintPhase;
1080     childInfo.updatePaintingRootForChildren(renderer());
1081
1082     // Paint our children.
1083     if (paintPhase != PaintPhaseSelfOutline) {
1084         for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1085             if (curr->renderer()->isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
1086                 curr->paint(childInfo, paintOffset, lineTop, lineBottom);
1087         }
1088     }
1089 }
1090
1091 void InlineFlowBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1092 {
1093     if (!fillLayer)
1094         return;
1095     paintFillLayers(paintInfo, c, fillLayer->next(), rect, op);
1096     paintFillLayer(paintInfo, c, fillLayer, rect, op);
1097 }
1098
1099 bool InlineFlowBox::boxShadowCanBeAppliedToBackground(const FillLayer& lastBackgroundLayer) const
1100 {
1101     // The checks here match how paintFillLayer() decides whether to clip (if it does, the shadow
1102     // would be clipped out, so it has to be drawn separately).
1103     StyleImage* image = lastBackgroundLayer.image();
1104     bool hasFillImage = image && image->canRender(renderer(), renderer()->style()->effectiveZoom());
1105     return (!hasFillImage && !renderer()->style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent();
1106 }
1107
1108 void InlineFlowBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1109 {
1110     StyleImage* img = fillLayer->image();
1111     bool hasFillImage = img && img->canRender(renderer(), renderer()->style()->effectiveZoom());
1112     if ((!hasFillImage && !renderer()->style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent())
1113         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1114 #if ENABLE(CSS_BOX_DECORATION_BREAK)
1115     else if (renderer()->style()->boxDecorationBreak() == DCLONE) {
1116         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1117         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1118         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1119     }
1120 #endif
1121     else {
1122         // We have a fill image that spans multiple lines.
1123         // We need to adjust tx and ty by the width of all previous lines.
1124         // Think of background painting on inlines as though you had one long line, a single continuous
1125         // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1126         // as though you had one single line.  This means each line has to pick up the background where
1127         // the previous line left off.
1128         LayoutUnit logicalOffsetOnLine = 0;
1129         LayoutUnit totalLogicalWidth;
1130         if (renderer()->style()->direction() == LTR) {
1131             for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1132                 logicalOffsetOnLine += curr->logicalWidth();
1133             totalLogicalWidth = logicalOffsetOnLine;
1134             for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1135                 totalLogicalWidth += curr->logicalWidth();
1136         } else {
1137             for (InlineFlowBox* curr = nextLineBox(); curr; curr = curr->nextLineBox())
1138                 logicalOffsetOnLine += curr->logicalWidth();
1139             totalLogicalWidth = logicalOffsetOnLine;
1140             for (InlineFlowBox* curr = this; curr; curr = curr->prevLineBox())
1141                 totalLogicalWidth += curr->logicalWidth();
1142         }
1143         LayoutUnit stripX = rect.x() - (isHorizontal() ? logicalOffsetOnLine : ZERO_LAYOUT_UNIT);
1144         LayoutUnit stripY = rect.y() - (isHorizontal() ? ZERO_LAYOUT_UNIT : logicalOffsetOnLine);
1145         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : static_cast<LayoutUnit>(width());
1146         LayoutUnit stripHeight = isHorizontal() ? static_cast<LayoutUnit>(height()) : totalLogicalWidth;
1147
1148         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1149         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1150         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, LayoutRect(stripX, stripY, stripWidth, stripHeight), BackgroundBleedNone, this, rect.size(), op);
1151     }
1152 }
1153
1154 void InlineFlowBox::paintBoxShadow(const PaintInfo& info, RenderStyle* s, ShadowStyle shadowStyle, const LayoutRect& paintRect)
1155 {
1156     if ((!prevLineBox() && !nextLineBox()) || !parent())
1157         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle);
1158     else {
1159         // FIXME: We can do better here in the multi-line case. We want to push a clip so that the shadow doesn't
1160         // protrude incorrectly at the edges, and we want to possibly include shadows cast from the previous/following lines
1161         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle, includeLogicalLeftEdge(), includeLogicalRightEdge());
1162     }
1163 }
1164
1165 void InlineFlowBox::constrainToLineTopAndBottomIfNeeded(LayoutRect& rect) const
1166 {
1167     bool noQuirksMode = renderer()->document()->inNoQuirksMode();
1168     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
1169         const RootInlineBox* rootBox = root();
1170         LayoutUnit logicalTop = isHorizontal() ? rect.y() : rect.x();
1171         LayoutUnit logicalHeight = isHorizontal() ? rect.height() : rect.width();
1172         LayoutUnit bottom = min(rootBox->lineBottom(), logicalTop + logicalHeight);
1173         logicalTop = max(rootBox->lineTop(), logicalTop);
1174         logicalHeight = bottom - logicalTop;
1175         if (isHorizontal()) {
1176             rect.setY(logicalTop);
1177             rect.setHeight(logicalHeight);
1178         } else {
1179             rect.setX(logicalTop);
1180             rect.setWidth(logicalHeight);
1181         }
1182     }
1183 }
1184
1185 static LayoutRect clipRectForNinePieceImageStrip(InlineFlowBox* box, const NinePieceImage& image, const LayoutRect& paintRect)
1186 {
1187     LayoutRect clipRect(paintRect);
1188     RenderStyle* style = box->renderer()->style();
1189     LayoutBoxExtent outsets = style->imageOutsets(image);
1190     if (box->isHorizontal()) {
1191         clipRect.setY(paintRect.y() - outsets.top());
1192         clipRect.setHeight(paintRect.height() + outsets.top() + outsets.bottom());
1193         if (box->includeLogicalLeftEdge()) {
1194             clipRect.setX(paintRect.x() - outsets.left());
1195             clipRect.setWidth(paintRect.width() + outsets.left());
1196         }
1197         if (box->includeLogicalRightEdge())
1198             clipRect.setWidth(clipRect.width() + outsets.right());
1199     } else {
1200         clipRect.setX(paintRect.x() - outsets.left());
1201         clipRect.setWidth(paintRect.width() + outsets.left() + outsets.right());
1202         if (box->includeLogicalLeftEdge()) {
1203             clipRect.setY(paintRect.y() - outsets.top());
1204             clipRect.setHeight(paintRect.height() + outsets.top());
1205         }
1206         if (box->includeLogicalRightEdge())
1207             clipRect.setHeight(clipRect.height() + outsets.bottom());
1208     }
1209     return clipRect;
1210 }
1211
1212 void InlineFlowBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1213 {
1214     if (!paintInfo.shouldPaintWithinRoot(renderer()) || renderer()->style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
1215         return;
1216
1217     // Pixel snap background/border painting.
1218     LayoutRect frameRect = roundedFrameRect();
1219
1220     constrainToLineTopAndBottomIfNeeded(frameRect);
1221
1222     // Move x/y to our coordinates.
1223     LayoutRect localRect(frameRect);
1224     flipForWritingMode(localRect);
1225     LayoutPoint adjustedPaintoffset = paintOffset + localRect.location();
1226
1227     GraphicsContext* context = paintInfo.context;
1228
1229     // You can use p::first-line to specify a background. If so, the root line boxes for
1230     // a line may actually have to paint a background.
1231     RenderStyle* styleToUse = renderer()->style(isFirstLineStyle());
1232     if ((!parent() && isFirstLineStyle() && styleToUse != renderer()->style()) || (parent() && renderer()->hasBoxDecorations())) {
1233         LayoutRect paintRect = LayoutRect(adjustedPaintoffset, frameRect.size());
1234         // Shadow comes first and is behind the background and border.
1235         if (!boxModelObject()->boxShadowShouldBeAppliedToBackground(BackgroundBleedNone, this))
1236             paintBoxShadow(paintInfo, styleToUse, Normal, paintRect);
1237
1238         Color c = styleToUse->visitedDependentColor(CSSPropertyBackgroundColor);
1239         paintFillLayers(paintInfo, c, styleToUse->backgroundLayers(), paintRect);
1240         paintBoxShadow(paintInfo, styleToUse, Inset, paintRect);
1241
1242         // :first-line cannot be used to put borders on a line. Always paint borders with our
1243         // non-first-line style.
1244         if (parent() && renderer()->style()->hasBorder()) {
1245             const NinePieceImage& borderImage = renderer()->style()->borderImage();
1246             StyleImage* borderImageSource = borderImage.image();
1247             bool hasBorderImage = borderImageSource && borderImageSource->canRender(renderer(), styleToUse->effectiveZoom());
1248             if (hasBorderImage && !borderImageSource->isLoaded())
1249                 return; // Don't paint anything while we wait for the image to load.
1250
1251             // The simple case is where we either have no border image or we are the only box for this object.  In those
1252             // cases only a single call to draw is required.
1253             if (!hasBorderImage || (!prevLineBox() && !nextLineBox()))
1254                 boxModelObject()->paintBorder(paintInfo, paintRect, renderer()->style(isFirstLineStyle()), BackgroundBleedNone, includeLogicalLeftEdge(), includeLogicalRightEdge());
1255             else {
1256                 // We have a border image that spans multiple lines.
1257                 // We need to adjust tx and ty by the width of all previous lines.
1258                 // Think of border image painting on inlines as though you had one long line, a single continuous
1259                 // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1260                 // as though you had one single line.  This means each line has to pick up the image where
1261                 // the previous line left off.
1262                 // FIXME: What the heck do we do with RTL here? The math we're using is obviously not right,
1263                 // but it isn't even clear how this should work at all.
1264                 LayoutUnit logicalOffsetOnLine = 0;
1265                 for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1266                     logicalOffsetOnLine += curr->logicalWidth();
1267                 LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1268                 for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1269                     totalLogicalWidth += curr->logicalWidth();
1270                 LayoutUnit stripX = adjustedPaintoffset.x() - (isHorizontal() ? logicalOffsetOnLine : ZERO_LAYOUT_UNIT);
1271                 LayoutUnit stripY = adjustedPaintoffset.y() - (isHorizontal() ? ZERO_LAYOUT_UNIT : logicalOffsetOnLine);
1272                 LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1273                 LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1274
1275                 LayoutRect clipRect = clipRectForNinePieceImageStrip(this, borderImage, paintRect);
1276                 GraphicsContextStateSaver stateSaver(*context);
1277                 context->clip(clipRect);
1278                 boxModelObject()->paintBorder(paintInfo, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer()->style(isFirstLineStyle()));
1279             }
1280         }
1281     }
1282 }
1283
1284 void InlineFlowBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1285 {
1286     if (!paintInfo.shouldPaintWithinRoot(renderer()) || renderer()->style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
1287         return;
1288
1289     // Pixel snap mask painting.
1290     LayoutRect frameRect = roundedFrameRect();
1291
1292     constrainToLineTopAndBottomIfNeeded(frameRect);
1293
1294     // Move x/y to our coordinates.
1295     LayoutRect localRect(frameRect);
1296     flipForWritingMode(localRect);
1297     LayoutPoint adjustedPaintOffset = paintOffset + localRect.location();
1298
1299     const NinePieceImage& maskNinePieceImage = renderer()->style()->maskBoxImage();
1300     StyleImage* maskBoxImage = renderer()->style()->maskBoxImage().image();
1301
1302     // Figure out if we need to push a transparency layer to render our mask.
1303     bool pushTransparencyLayer = false;
1304     bool compositedMask = renderer()->hasLayer() && boxModelObject()->layer()->hasCompositedMask();
1305     bool flattenCompositingLayers = renderer()->view()->frameView() && renderer()->view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
1306     CompositeOperator compositeOp = CompositeSourceOver;
1307     if (!compositedMask || flattenCompositingLayers) {
1308         if ((maskBoxImage && renderer()->style()->maskLayers()->hasImage()) || renderer()->style()->maskLayers()->next())
1309             pushTransparencyLayer = true;
1310
1311         compositeOp = CompositeDestinationIn;
1312         if (pushTransparencyLayer) {
1313             paintInfo.context->setCompositeOperation(CompositeDestinationIn);
1314             paintInfo.context->beginTransparencyLayer(1.0f);
1315             compositeOp = CompositeSourceOver;
1316         }
1317     }
1318
1319     LayoutRect paintRect = LayoutRect(adjustedPaintOffset, frameRect.size());
1320     paintFillLayers(paintInfo, Color(), renderer()->style()->maskLayers(), paintRect, compositeOp);
1321
1322     bool hasBoxImage = maskBoxImage && maskBoxImage->canRender(renderer(), renderer()->style()->effectiveZoom());
1323     if (!hasBoxImage || !maskBoxImage->isLoaded()) {
1324         if (pushTransparencyLayer)
1325             paintInfo.context->endTransparencyLayer();
1326         return; // Don't paint anything while we wait for the image to load.
1327     }
1328
1329     // The simple case is where we are the only box for this object.  In those
1330     // cases only a single call to draw is required.
1331     if (!prevLineBox() && !nextLineBox()) {
1332         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(adjustedPaintOffset, frameRect.size()), renderer()->style(), maskNinePieceImage, compositeOp);
1333     } else {
1334         // We have a mask image that spans multiple lines.
1335         // We need to adjust _tx and _ty by the width of all previous lines.
1336         LayoutUnit logicalOffsetOnLine = 0;
1337         for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1338             logicalOffsetOnLine += curr->logicalWidth();
1339         LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1340         for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1341             totalLogicalWidth += curr->logicalWidth();
1342         LayoutUnit stripX = adjustedPaintOffset.x() - (isHorizontal() ? logicalOffsetOnLine : ZERO_LAYOUT_UNIT);
1343         LayoutUnit stripY = adjustedPaintOffset.y() - (isHorizontal() ? ZERO_LAYOUT_UNIT : logicalOffsetOnLine);
1344         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1345         LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1346
1347         LayoutRect clipRect = clipRectForNinePieceImageStrip(this, maskNinePieceImage, paintRect);
1348         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1349         paintInfo.context->clip(clipRect);
1350         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer()->style(), maskNinePieceImage, compositeOp);
1351     }
1352
1353     if (pushTransparencyLayer)
1354         paintInfo.context->endTransparencyLayer();
1355 }
1356
1357 InlineBox* InlineFlowBox::firstLeafChild() const
1358 {
1359     InlineBox* leaf = 0;
1360     for (InlineBox* child = firstChild(); child && !leaf; child = child->nextOnLine())
1361         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->firstLeafChild();
1362     return leaf;
1363 }
1364
1365 InlineBox* InlineFlowBox::lastLeafChild() const
1366 {
1367     InlineBox* leaf = 0;
1368     for (InlineBox* child = lastChild(); child && !leaf; child = child->prevOnLine())
1369         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->lastLeafChild();
1370     return leaf;
1371 }
1372
1373 RenderObject::SelectionState InlineFlowBox::selectionState()
1374 {
1375     return RenderObject::SelectionNone;
1376 }
1377
1378 bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const
1379 {
1380     for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
1381         if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
1382             return false;
1383     }
1384     return true;
1385 }
1386
1387 float InlineFlowBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox)
1388 {
1389     float result = -1;
1390     // We iterate over all children, the foundBox variable tells us when we've found the
1391     // box containing the ellipsis.  All boxes after that one in the flow are hidden.
1392     // If our flow is ltr then iterate over the boxes from left to right, otherwise iterate
1393     // from right to left. Varying the order allows us to correctly hide the boxes following the ellipsis.
1394     InlineBox* box = ltr ? firstChild() : lastChild();
1395
1396     // NOTE: these will cross after foundBox = true.
1397     int visibleLeftEdge = blockLeftEdge;
1398     int visibleRightEdge = blockRightEdge;
1399
1400     while (box) {
1401         int currResult = box->placeEllipsisBox(ltr, visibleLeftEdge, visibleRightEdge, ellipsisWidth, truncatedWidth, foundBox);
1402         if (currResult != -1 && result == -1)
1403             result = currResult;
1404
1405         if (ltr) {
1406             visibleLeftEdge += box->logicalWidth();
1407             box = box->nextOnLine();
1408         }
1409         else {
1410             visibleRightEdge -= box->logicalWidth();
1411             box = box->prevOnLine();
1412         }
1413     }
1414     return result;
1415 }
1416
1417 void InlineFlowBox::clearTruncation()
1418 {
1419     for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
1420         box->clearTruncation();
1421 }
1422
1423 LayoutUnit InlineFlowBox::computeOverAnnotationAdjustment(LayoutUnit allowedPosition) const
1424 {
1425     LayoutUnit result = 0;
1426     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1427         if (curr->renderer()->isOutOfFlowPositioned())
1428             continue; // Positioned placeholders don't affect calculations.
1429
1430         if (curr->isInlineFlowBox())
1431             result = max(result, toInlineFlowBox(curr)->computeOverAnnotationAdjustment(allowedPosition));
1432
1433         if (curr->renderer()->isReplaced() && curr->renderer()->isRubyRun()) {
1434             RenderRubyRun* rubyRun = toRenderRubyRun(curr->renderer());
1435             RenderRubyText* rubyText = rubyRun->rubyText();
1436             if (!rubyText)
1437                 continue;
1438
1439             if (!rubyRun->style()->isFlippedLinesWritingMode()) {
1440                 LayoutUnit topOfFirstRubyTextLine = rubyText->logicalTop() + (rubyText->firstRootBox() ? rubyText->firstRootBox()->lineTop() : ZERO_LAYOUT_UNIT);
1441                 if (topOfFirstRubyTextLine >= 0)
1442                     continue;
1443                 topOfFirstRubyTextLine += curr->logicalTop();
1444                 result = max(result, allowedPosition - topOfFirstRubyTextLine);
1445             } else {
1446                 LayoutUnit bottomOfLastRubyTextLine = rubyText->logicalTop() + (rubyText->lastRootBox() ? rubyText->lastRootBox()->lineBottom() : rubyText->logicalHeight());
1447                 if (bottomOfLastRubyTextLine <= curr->logicalHeight())
1448                     continue;
1449                 bottomOfLastRubyTextLine += curr->logicalTop();
1450                 result = max(result, bottomOfLastRubyTextLine - allowedPosition);
1451             }
1452         }
1453
1454         if (curr->isInlineTextBox()) {
1455             RenderStyle* style = curr->renderer()->style(isFirstLineStyle());
1456             TextEmphasisPosition emphasisMarkPosition;
1457             if (style->textEmphasisMark() != TextEmphasisMarkNone && toInlineTextBox(curr)->getEmphasisMarkPosition(style, emphasisMarkPosition) && emphasisMarkPosition == TextEmphasisPositionOver) {
1458                 if (!style->isFlippedLinesWritingMode()) {
1459                     int topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1460                     result = max(result, allowedPosition - topOfEmphasisMark);
1461                 } else {
1462                     int bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1463                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1464                 }
1465             }
1466         }
1467     }
1468     return result;
1469 }
1470
1471 LayoutUnit InlineFlowBox::computeUnderAnnotationAdjustment(LayoutUnit allowedPosition) const
1472 {
1473     LayoutUnit result = 0;
1474     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1475         if (curr->renderer()->isOutOfFlowPositioned())
1476             continue; // Positioned placeholders don't affect calculations.
1477
1478         if (curr->isInlineFlowBox())
1479             result = max(result, toInlineFlowBox(curr)->computeUnderAnnotationAdjustment(allowedPosition));
1480
1481         if (curr->isInlineTextBox()) {
1482             RenderStyle* style = curr->renderer()->style(isFirstLineStyle());
1483             if (style->textEmphasisMark() != TextEmphasisMarkNone && style->textEmphasisPosition() == TextEmphasisPositionUnder) {
1484                 if (!style->isFlippedLinesWritingMode()) {
1485                     LayoutUnit bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1486                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1487                 } else {
1488                     LayoutUnit topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1489                     result = max(result, allowedPosition - topOfEmphasisMark);
1490                 }
1491             }
1492         }
1493     }
1494     return result;
1495 }
1496
1497 void InlineFlowBox::collectLeafBoxesInLogicalOrder(Vector<InlineBox*>& leafBoxesInLogicalOrder, CustomInlineBoxRangeReverse customReverseImplementation, void* userData) const
1498 {
1499     InlineBox* leaf = firstLeafChild();
1500
1501     // FIXME: The reordering code is a copy of parts from BidiResolver::createBidiRunsForLine, operating directly on InlineBoxes, instead of BidiRuns.
1502     // Investigate on how this code could possibly be shared.
1503     unsigned char minLevel = 128;
1504     unsigned char maxLevel = 0;
1505
1506     // First find highest and lowest levels, and initialize leafBoxesInLogicalOrder with the leaf boxes in visual order.
1507     for (; leaf; leaf = leaf->nextLeafChild()) {
1508         minLevel = min(minLevel, leaf->bidiLevel());
1509         maxLevel = max(maxLevel, leaf->bidiLevel());
1510         leafBoxesInLogicalOrder.append(leaf);
1511     }
1512
1513     if (renderer()->style()->rtlOrdering() == VisualOrder)
1514         return;
1515
1516     // Reverse of reordering of the line (L2 according to Bidi spec):
1517     // L2. From the highest level found in the text to the lowest odd level on each line,
1518     // reverse any contiguous sequence of characters that are at that level or higher.
1519
1520     // Reversing the reordering of the line is only done up to the lowest odd level.
1521     if (!(minLevel % 2))
1522         ++minLevel;
1523
1524     Vector<InlineBox*>::iterator end = leafBoxesInLogicalOrder.end();
1525     while (minLevel <= maxLevel) {
1526         Vector<InlineBox*>::iterator it = leafBoxesInLogicalOrder.begin();
1527         while (it != end) {
1528             while (it != end) {
1529                 if ((*it)->bidiLevel() >= minLevel)
1530                     break;
1531                 ++it;
1532             }
1533             Vector<InlineBox*>::iterator first = it;
1534             while (it != end) {
1535                 if ((*it)->bidiLevel() < minLevel)
1536                     break;
1537                 ++it;
1538             }
1539             Vector<InlineBox*>::iterator last = it;
1540             if (customReverseImplementation) {
1541                 ASSERT(userData);
1542                 (*customReverseImplementation)(userData, first, last);
1543             } else
1544                 std::reverse(first, last);
1545         }
1546         ++minLevel;
1547     }
1548 }
1549
1550 #ifndef NDEBUG
1551
1552 const char* InlineFlowBox::boxName() const
1553 {
1554     return "InlineFlowBox";
1555 }
1556
1557 void InlineFlowBox::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj, int depth) const
1558 {
1559     InlineBox::showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth);
1560     for (const InlineBox* box = firstChild(); box; box = box->nextOnLine())
1561         box->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth + 1);
1562 }
1563
1564 void InlineFlowBox::checkConsistency() const
1565 {
1566 #ifdef CHECK_CONSISTENCY
1567     ASSERT(!m_hasBadChildList);
1568     const InlineBox* prev = 0;
1569     for (const InlineBox* child = m_firstChild; child; child = child->nextOnLine()) {
1570         ASSERT(child->parent() == this);
1571         ASSERT(child->prevOnLine() == prev);
1572         prev = child;
1573     }
1574     ASSERT(prev == m_lastChild);
1575 #endif
1576 }
1577
1578 #endif
1579
1580 } // namespace WebCore