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 "CSSPropertyNames.h"
  24 #include "Document.h"
  25 #include "EllipsisBox.h"
  26 #include "Font.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 "RenderView.h"
  39 #include "RootInlineBox.h"
  40 #include "Text.h"
  41
  42 #include <math.h>
  43
  44 using namespace std;
  45
  46 namespace WebCore {
  47
  48 struct SameSizeAsInlineFlowBox : public InlineBox {
  49     void* pointers[5];
  50     uint32_t bitfields : 23;
  51 };
  52
  53 COMPILE_ASSERT(sizeof(InlineFlowBox) == sizeof(SameSizeAsInlineFlowBox), InlineFlowBox_should_stay_small);
  54
  55 #ifndef NDEBUG
  56
  57 InlineFlowBox::~InlineFlowBox()
  58 {
  59     if (!m_hasBadChildList)
  60         for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
  61             child->setHasBadParent();
  62 }
  63
  64 #endif
  65
  66 LayoutUnit InlineFlowBox::getFlowSpacingLogicalWidth()
  67 {
  68     LayoutUnit totWidth = marginBorderPaddingLogicalLeft() + marginBorderPaddingLogicalRight();
  69     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
  70         if (curr->isInlineFlowBox())
  71             totWidth += toInlineFlowBox(curr)->getFlowSpacingLogicalWidth();
  72     }
  73     return totWidth;
  74 }
  75
  76 IntRect InlineFlowBox::roundedFrameRect() const
  77 {
  78     // Begin by snapping the x and y coordinates to the nearest pixel.
  79     int snappedX = lroundf(x());
  80     int snappedY = lroundf(y());
  81
  82     int snappedMaxX = lroundf(x() + width());
  83     int snappedMaxY = lroundf(y() + height());
  84
  85     return IntRect(snappedX, snappedY, snappedMaxX - snappedX, snappedMaxY - snappedY);
  86 }
  87
  88 static void setHasTextDescendantsOnAncestors(InlineFlowBox* box)
  89 {
  90     while (box && !box->hasTextDescendants()) {
  91         box->setHasTextDescendants();
  92         box = box->parent();
  93     }
  94 }
  95
  96 void InlineFlowBox::addToLine(InlineBox* child)
  97 {
  98     ASSERT(!child->parent());
  99     ASSERT(!child->nextOnLine());
 100     ASSERT(!child->prevOnLine());
 101     checkConsistency();
 102
 103     child->setParent(this);
 104     if (!m_firstChild) {
 105         m_firstChild = child;
 106         m_lastChild = child;
 107     } else {
 108         m_lastChild->setNextOnLine(child);
 109         child->setPrevOnLine(m_lastChild);
 110         m_lastChild = child;
 111     }
 112     child->setFirstLineStyleBit(isFirstLineStyle());
 113     child->setIsHorizontal(isHorizontal());
 114     if (child->behavesLikeText()) {
 115         if (child->renderer().parent() == &renderer())
 116             m_hasTextChildren = true;
 117         setHasTextDescendantsOnAncestors(this);
 118     } else if (child->isInlineFlowBox()) {
 119         if (toInlineFlowBox(child)->hasTextDescendants())
 120             setHasTextDescendantsOnAncestors(this);
 121     }
 122
 123     if (descendantsHaveSameLineHeightAndBaseline() && !child->renderer().isOutOfFlowPositioned()) {
 124         RenderStyle* parentStyle = renderer().style(isFirstLineStyle());
 125         RenderStyle* childStyle = child->renderer().style(isFirstLineStyle());
 126         bool shouldClearDescendantsHaveSameLineHeightAndBaseline = false;
 127         if (child->renderer().isReplaced())
 128             shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 129         else if (child->behavesLikeText()) {
 130             if (child->renderer().isLineBreak() || child->renderer().parent() != &renderer()) {
 131                 if (!parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 132                     || parentStyle->lineHeight() != childStyle->lineHeight()
 133                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE)
 134                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 135             }
 136             if (childStyle->hasTextCombine() || childStyle->textEmphasisMark() != TextEmphasisMarkNone)
 137                 shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 138         } else {
 139             if (child->renderer().isLineBreak()) {
 140                 // FIXME: This is dumb. We only turn off because current layout test results expect the <br> to be 0-height on the baseline.
 141                 // Other than making a zillion tests have to regenerate results, there's no reason to ditch the optimization here.
 142                 shouldClearDescendantsHaveSameLineHeightAndBaseline = child->renderer().isBR();
 143             } else {
 144                 ASSERT(isInlineFlowBox());
 145                 InlineFlowBox* childFlowBox = toInlineFlowBox(child);
 146                 // Check the child's bit, and then also check for differences in font, line-height, vertical-align
 147                 if (!childFlowBox->descendantsHaveSameLineHeightAndBaseline()
 148                     || !parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 149                     || parentStyle->lineHeight() != childStyle->lineHeight()
 150                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE
 151                     || childStyle->hasBorder() || childStyle->hasPadding() || childStyle->hasTextCombine())
 152                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 153             }
 154         }
 155
 156         if (shouldClearDescendantsHaveSameLineHeightAndBaseline)
 157             clearDescendantsHaveSameLineHeightAndBaseline();
 158     }
 159
 160     if (!child->renderer().isOutOfFlowPositioned()) {
 161         if (child->behavesLikeText()) {
 162             RenderStyle* childStyle = child->renderer().style(isFirstLineStyle());
 163             if (childStyle->letterSpacing() < 0 || childStyle->textShadow() || childStyle->textEmphasisMark() != TextEmphasisMarkNone || childStyle->textStrokeWidth())
 164                 child->clearKnownToHaveNoOverflow();
 165         } else if (child->renderer().isReplaced()) {
 166             const RenderBox& box = toRenderBox(child->renderer());
 167             if (box.hasRenderOverflow() || box.hasSelfPaintingLayer())
 168                 child->clearKnownToHaveNoOverflow();
 169         } else if (!child->renderer().isLineBreak() && (child->renderer().style(isFirstLineStyle())->boxShadow() || child->boxModelObject()->hasSelfPaintingLayer()
 170                    || (child->renderer().isListMarker() && !toRenderListMarker(child->renderer()).isInside())
 171                    || child->renderer().style(isFirstLineStyle())->hasBorderImageOutsets()))
 172             child->clearKnownToHaveNoOverflow();
 173
 174         if (knownToHaveNoOverflow() && child->isInlineFlowBox() && !toInlineFlowBox(child)->knownToHaveNoOverflow())
 175             clearKnownToHaveNoOverflow();
 176     }
 177
 178     checkConsistency();
 179 }
 180
 181 void InlineFlowBox::removeChild(InlineBox* child)
 182 {
 183     checkConsistency();
 184
 185     if (!isDirty())
 186         dirtyLineBoxes();
 187
 188     root().childRemoved(child);
 189
 190     if (child == m_firstChild)
 191         m_firstChild = child->nextOnLine();
 192     if (child == m_lastChild)
 193         m_lastChild = child->prevOnLine();
 194     if (child->nextOnLine())
 195         child->nextOnLine()->setPrevOnLine(child->prevOnLine());
 196     if (child->prevOnLine())
 197         child->prevOnLine()->setNextOnLine(child->nextOnLine());
 198
 199     child->setParent(0);
 200
 201     checkConsistency();
 202 }
 203
 204 void InlineFlowBox::deleteLine(RenderArena& arena)
 205 {
 206     InlineBox* child = firstChild();
 207     InlineBox* next = 0;
 208     while (child) {
 209         ASSERT(this == child->parent());
 210         next = child->nextOnLine();
 211 #ifndef NDEBUG
 212         child->setParent(0);
 213 #endif
 214         child->deleteLine(arena);
 215         child = next;
 216     }
 217 #ifndef NDEBUG
 218     m_firstChild = 0;
 219     m_lastChild = 0;
 220 #endif
 221
 222     removeLineBoxFromRenderObject();
 223     destroy(arena);
 224 }
 225
 226 void InlineFlowBox::removeLineBoxFromRenderObject()
 227 {
 228     toRenderInline(renderer()).lineBoxes().removeLineBox(this);
 229 }
 230
 231 void InlineFlowBox::extractLine()
 232 {
 233     if (!extracted())
 234         extractLineBoxFromRenderObject();
 235     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 236         child->extractLine();
 237 }
 238
 239 void InlineFlowBox::extractLineBoxFromRenderObject()
 240 {
 241     toRenderInline(renderer()).lineBoxes().extractLineBox(this);
 242 }
 243
 244 void InlineFlowBox::attachLine()
 245 {
 246     if (extracted())
 247         attachLineBoxToRenderObject();
 248     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 249         child->attachLine();
 250 }
 251
 252 void InlineFlowBox::attachLineBoxToRenderObject()
 253 {
 254     toRenderInline(renderer()).lineBoxes().attachLineBox(this);
 255 }
 256
 257 void InlineFlowBox::adjustPosition(float dx, float dy)
 258 {
 259     InlineBox::adjustPosition(dx, dy);
 260     for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
 261         child->adjustPosition(dx, dy);
 262     if (m_overflow)
 263         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.
 264 }
 265
 266 RenderLineBoxList& InlineFlowBox::rendererLineBoxes() const
 267 {
 268     return toRenderInline(renderer()).lineBoxes();
 269 }
 270
 271 static inline bool isLastChildForRenderer(RenderElement* ancestor, RenderObject* child)
 272 {
 273     if (!child)
 274         return false;
 275
 276     if (child == ancestor)
 277         return true;
 278
 279     RenderObject* curr = child;
 280     RenderElement* parent = curr->parent();
 281     while (parent && (!parent->isRenderBlock() || parent->isInline())) {
 282         if (parent->lastChild() != curr)
 283             return false;
 284         if (parent == ancestor)
 285             return true;
 286
 287         curr = parent;
 288         parent = curr->parent();
 289     }
 290
 291     return true;
 292 }
 293
 294 static bool isAncestorAndWithinBlock(RenderObject& ancestor, RenderObject* child)
 295 {
 296     RenderObject* object = child;
 297     while (object && (!object->isRenderBlock() || object->isInline())) {
 298         if (object == &ancestor)
 299             return true;
 300         object = object->parent();
 301     }
 302     return false;
 303 }
 304
 305 void InlineFlowBox::determineSpacingForFlowBoxes(bool lastLine, bool isLogicallyLastRunWrapped, RenderObject* logicallyLastRunRenderer)
 306 {
 307     // All boxes start off open.  They will not apply any margins/border/padding on
 308     // any side.
 309     bool includeLeftEdge = false;
 310     bool includeRightEdge = false;
 311
 312     // The root inline box never has borders/margins/padding.
 313     if (parent()) {
 314         bool ltr = renderer().style()->isLeftToRightDirection();
 315
 316         // Check to see if all initial lines are unconstructed.  If so, then
 317         // we know the inline began on this line (unless we are a continuation).
 318         RenderLineBoxList& lineBoxList = rendererLineBoxes();
 319         if (!lineBoxList.firstLineBox()->isConstructed() && !renderer().isInlineElementContinuation()) {
 320 #if ENABLE(CSS_BOX_DECORATION_BREAK)
 321             if (renderer().style()->boxDecorationBreak() == DCLONE)
 322                 includeLeftEdge = includeRightEdge = true;
 323             else
 324 #endif
 325             if (ltr && lineBoxList.firstLineBox() == this)
 326                 includeLeftEdge = true;
 327             else if (!ltr && lineBoxList.lastLineBox() == this)
 328                 includeRightEdge = true;
 329         }
 330
 331         if (!lineBoxList.lastLineBox()->isConstructed()) {
 332             RenderInline& inlineFlow = toRenderInline(renderer());
 333             bool isLastObjectOnLine = !isAncestorAndWithinBlock(renderer(), logicallyLastRunRenderer) || (isLastChildForRenderer(&renderer(), logicallyLastRunRenderer) && !isLogicallyLastRunWrapped);
 334
 335             // We include the border under these conditions:
 336             // (1) The next line was not created, or it is constructed. We check the previous line for rtl.
 337             // (2) The logicallyLastRun is not a descendant of this renderer.
 338             // (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.
 339 #if ENABLE(CSS_BOX_DECORATION_BREAK)
 340             // (4) The decoration break is set to clone therefore there will be borders on every sides.
 341             if (renderer().style()->boxDecorationBreak() == DCLONE)
 342                 includeLeftEdge = includeRightEdge = true;
 343             else
 344 #endif
 345             if (ltr) {
 346                 if (!nextLineBox()
 347                     && ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation()))
 348                     includeRightEdge = true;
 349             } else {
 350                 if ((!prevLineBox() || prevLineBox()->isConstructed())
 351                     && ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation()))
 352                     includeLeftEdge = true;
 353             }
 354         }
 355     }
 356
 357     setEdges(includeLeftEdge, includeRightEdge);
 358
 359     // Recur into our children.
 360     for (InlineBox* currChild = firstChild(); currChild; currChild = currChild->nextOnLine()) {
 361         if (currChild->isInlineFlowBox()) {
 362             InlineFlowBox* currFlow = toInlineFlowBox(currChild);
 363             currFlow->determineSpacingForFlowBoxes(lastLine, isLogicallyLastRunWrapped, logicallyLastRunRenderer);
 364         }
 365     }
 366 }
 367
 368 float InlineFlowBox::placeBoxesInInlineDirection(float logicalLeft, bool& needsWordSpacing, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 369 {
 370     // Set our x position.
 371     beginPlacingBoxRangesInInlineDirection(logicalLeft);
 372
 373     float startLogicalLeft = logicalLeft;
 374     logicalLeft += borderLogicalLeft() + paddingLogicalLeft();
 375
 376     float minLogicalLeft = startLogicalLeft;
 377     float maxLogicalRight = logicalLeft;
 378
 379     placeBoxRangeInInlineDirection(firstChild(), 0, logicalLeft, minLogicalLeft, maxLogicalRight, needsWordSpacing, textBoxDataMap);
 380
 381     logicalLeft += borderLogicalRight() + paddingLogicalRight();
 382     endPlacingBoxRangesInInlineDirection(startLogicalLeft, logicalLeft, minLogicalLeft, maxLogicalRight);
 383     return logicalLeft;
 384 }
 385
 386 float InlineFlowBox::placeBoxRangeInInlineDirection(InlineBox* firstChild, InlineBox* lastChild, float& logicalLeft, float& minLogicalLeft, float& maxLogicalRight, bool& needsWordSpacing, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 387 {
 388     for (InlineBox* curr = firstChild; curr && curr != lastChild; curr = curr->nextOnLine()) {
 389         if (curr->renderer().isText()) {
 390             InlineTextBox* text = toInlineTextBox(curr);
 391             RenderText& rt = text->renderer();
 392             if (rt.textLength()) {
 393                 if (needsWordSpacing && isSpaceOrNewline(rt.characterAt(text->start())))
 394                     logicalLeft += rt.style(isFirstLineStyle())->font().wordSpacing();
 395                 needsWordSpacing = !isSpaceOrNewline(rt.characterAt(text->end()));
 396             }
 397             text->setLogicalLeft(logicalLeft);
 398             if (knownToHaveNoOverflow())
 399                 minLogicalLeft = min(logicalLeft, minLogicalLeft);
 400             logicalLeft += text->logicalWidth();
 401             if (knownToHaveNoOverflow())
 402                 maxLogicalRight = max(logicalLeft, maxLogicalRight);
 403         } else {
 404             if (curr->renderer().isOutOfFlowPositioned()) {
 405                 if (curr->renderer().parent()->style()->isLeftToRightDirection())
 406                     curr->setLogicalLeft(logicalLeft);
 407                 else
 408                     // Our offset that we cache needs to be from the edge of the right border box and
 409                     // not the left border box.  We have to subtract |x| from the width of the block
 410                     // (which can be obtained from the root line box).
 411                     curr->setLogicalLeft(root().block().logicalWidth() - logicalLeft);
 412                 continue; // The positioned object has no effect on the width.
 413             }
 414             if (curr->renderer().isRenderInline()) {
 415                 InlineFlowBox* flow = toInlineFlowBox(curr);
 416                 logicalLeft += flow->marginLogicalLeft();
 417                 if (knownToHaveNoOverflow())
 418                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 419                 logicalLeft = flow->placeBoxesInInlineDirection(logicalLeft, needsWordSpacing, textBoxDataMap);
 420                 if (knownToHaveNoOverflow())
 421                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 422                 logicalLeft += flow->marginLogicalRight();
 423             } else if (!curr->renderer().isListMarker() || toRenderListMarker(curr->renderer()).isInside()) {
 424                 // The box can have a different writing-mode than the overall line, so this is a bit complicated.
 425                 // Just get all the physical margin and overflow values by hand based off |isVertical|.
 426                 LayoutUnit logicalLeftMargin = isHorizontal() ? curr->boxModelObject()->marginLeft() : curr->boxModelObject()->marginTop();
 427                 LayoutUnit logicalRightMargin = isHorizontal() ? curr->boxModelObject()->marginRight() : curr->boxModelObject()->marginBottom();
 428
 429                 logicalLeft += logicalLeftMargin;
 430                 curr->setLogicalLeft(logicalLeft);
 431                 if (knownToHaveNoOverflow())
 432                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 433                 logicalLeft += curr->logicalWidth();
 434                 if (knownToHaveNoOverflow())
 435                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 436                 logicalLeft += logicalRightMargin;
 437                 // If we encounter any space after this inline block then ensure it is treated as the space between two words.
 438                 needsWordSpacing = true;
 439             }
 440         }
 441     }
 442     return logicalLeft;
 443 }
 444
 445 bool InlineFlowBox::requiresIdeographicBaseline(const GlyphOverflowAndFallbackFontsMap& textBoxDataMap) const
 446 {
 447     if (isHorizontal())
 448         return false;
 449
 450     if (renderer().style(isFirstLineStyle())->fontDescription().nonCJKGlyphOrientation() == NonCJKGlyphOrientationUpright
 451         || renderer().style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 452         return true;
 453
 454     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 455         if (curr->renderer().isOutOfFlowPositioned())
 456             continue; // Positioned placeholders don't affect calculations.
 457
 458         if (curr->isInlineFlowBox()) {
 459             if (toInlineFlowBox(curr)->requiresIdeographicBaseline(textBoxDataMap))
 460                 return true;
 461         } else {
 462             if (curr->renderer().style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 463                 return true;
 464
 465             const Vector<const SimpleFontData*>* usedFonts = 0;
 466             if (curr->isInlineTextBox()) {
 467                 GlyphOverflowAndFallbackFontsMap::const_iterator it = textBoxDataMap.find(toInlineTextBox(curr));
 468                 usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first;
 469             }
 470
 471             if (usedFonts) {
 472                 for (size_t i = 0; i < usedFonts->size(); ++i) {
 473                     if (usedFonts->at(i)->hasVerticalGlyphs())
 474                         return true;
 475                 }
 476             }
 477         }
 478     }
 479
 480     return false;
 481 }
 482
 483 static bool verticalAlignApplies(const RenderObject& renderer)
 484 {
 485     // http://www.w3.org/TR/CSS2/visudet.html#propdef-vertical-align - vertical-align
 486     // only applies to inline level and table-cell elements
 487     return !renderer.isText() || renderer.parent()->isInline() || renderer.parent()->isTableCell();
 488 }
 489
 490 void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent, int maxPositionTop, int maxPositionBottom)
 491 {
 492     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 493         // The computed lineheight needs to be extended for the
 494         // positioned elements
 495         if (curr->renderer().isOutOfFlowPositioned())
 496             continue; // Positioned placeholders don't affect calculations.
 497
 498         if ((curr->verticalAlign() == TOP || curr->verticalAlign() == BOTTOM) && verticalAlignApplies(curr->renderer())) {
 499             int lineHeight = curr->lineHeight();
 500             if (curr->verticalAlign() == TOP) {
 501                 if (maxAscent + maxDescent < lineHeight)
 502                     maxDescent = lineHeight - maxAscent;
 503             }
 504             else {
 505                 if (maxAscent + maxDescent < lineHeight)
 506                     maxAscent = lineHeight - maxDescent;
 507             }
 508
 509             if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
 510                 break;
 511         }
 512
 513         if (curr->isInlineFlowBox())
 514             toInlineFlowBox(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
 515     }
 516 }
 517
 518 void InlineFlowBox::computeLogicalBoxHeights(RootInlineBox* rootBox, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom,
 519                                              int& maxAscent, int& maxDescent, bool& setMaxAscent, bool& setMaxDescent,
 520                                              bool strictMode, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
 521                                              FontBaseline baselineType, VerticalPositionCache& verticalPositionCache)
 522 {
 523     // The primary purpose of this function is to compute the maximal ascent and descent values for
 524     // a line. These values are computed based off the block's line-box-contain property, which indicates
 525     // what parts of descendant boxes have to fit within the line.
 526     //
 527     // The maxAscent value represents the distance of the highest point of any box (typically including line-height) from
 528     // the root box's baseline. The maxDescent value represents the distance of the lowest point of any box
 529     // (also typically including line-height) from the root box baseline. These values can be negative.
 530     //
 531     // A secondary purpose of this function is to store the offset of every box's baseline from the root box's
 532     // baseline. This information is cached in the logicalTop() of every box. We're effectively just using
 533     // the logicalTop() as scratch space.
 534     //
 535     // Because a box can be positioned such that it ends up fully above or fully below the
 536     // root line box, we only consider it to affect the maxAscent and maxDescent values if some
 537     // part of the box (EXCLUDING leading) is above (for ascent) or below (for descent) the root box's baseline.
 538     bool affectsAscent = false;
 539     bool affectsDescent = false;
 540     bool checkChildren = !descendantsHaveSameLineHeightAndBaseline();
 541
 542     if (isRootInlineBox()) {
 543         // Examine our root box.
 544         int ascent = 0;
 545         int descent = 0;
 546         rootBox->ascentAndDescentForBox(rootBox, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 547         if (strictMode || hasTextChildren() || (!checkChildren && hasTextDescendants())) {
 548             if (maxAscent < ascent || !setMaxAscent) {
 549                 maxAscent = ascent;
 550                 setMaxAscent = true;
 551             }
 552             if (maxDescent < descent || !setMaxDescent) {
 553                 maxDescent = descent;
 554                 setMaxDescent = true;
 555             }
 556         }
 557     }
 558
 559     if (!checkChildren)
 560         return;
 561
 562     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 563         if (curr->renderer().isOutOfFlowPositioned())
 564             continue; // Positioned placeholders don't affect calculations.
 565
 566         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 567
 568         bool affectsAscent = false;
 569         bool affectsDescent = false;
 570
 571         // The verticalPositionForBox function returns the distance between the child box's baseline
 572         // and the root box's baseline.  The value is negative if the child box's baseline is above the
 573         // root box's baseline, and it is positive if the child box's baseline is below the root box's baseline.
 574         curr->setLogicalTop(rootBox->verticalPositionForBox(curr, verticalPositionCache));
 575
 576         int ascent = 0;
 577         int descent = 0;
 578         rootBox->ascentAndDescentForBox(curr, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 579
 580         LayoutUnit boxHeight = ascent + descent;
 581         if (curr->verticalAlign() == TOP && verticalAlignApplies(curr->renderer())) {
 582             if (maxPositionTop < boxHeight)
 583                 maxPositionTop = boxHeight;
 584         } else if (curr->verticalAlign() == BOTTOM && verticalAlignApplies(curr->renderer())) {
 585             if (maxPositionBottom < boxHeight)
 586                 maxPositionBottom = boxHeight;
 587         } else if (!inlineFlowBox || strictMode || inlineFlowBox->hasTextChildren() || (inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants())
 588                    || inlineFlowBox->boxModelObject()->hasInlineDirectionBordersOrPadding()) {
 589             // Note that these values can be negative.  Even though we only affect the maxAscent and maxDescent values
 590             // if our box (excluding line-height) was above (for ascent) or below (for descent) the root baseline, once you factor in line-height
 591             // the final box can end up being fully above or fully below the root box's baseline!  This is ok, but what it
 592             // means is that ascent and descent (including leading), can end up being negative.  The setMaxAscent and
 593             // setMaxDescent booleans are used to ensure that we're willing to initially set maxAscent/Descent to negative
 594             // values.
 595             ascent -= curr->logicalTop();
 596             descent += curr->logicalTop();
 597             if (affectsAscent && (maxAscent < ascent || !setMaxAscent)) {
 598                 maxAscent = ascent;
 599                 setMaxAscent = true;
 600             }
 601
 602             if (affectsDescent && (maxDescent < descent || !setMaxDescent)) {
 603                 maxDescent = descent;
 604                 setMaxDescent = true;
 605             }
 606         }
 607
 608         if (inlineFlowBox)
 609             inlineFlowBox->computeLogicalBoxHeights(rootBox, maxPositionTop, maxPositionBottom, maxAscent, maxDescent,
 610                                                     setMaxAscent, setMaxDescent, strictMode, textBoxDataMap,
 611                                                     baselineType, verticalPositionCache);
 612     }
 613 }
 614
 615 void InlineFlowBox::placeBoxesInBlockDirection(LayoutUnit top, LayoutUnit maxHeight, int maxAscent, bool strictMode, LayoutUnit& lineTop, LayoutUnit& lineBottom, bool& setLineTop,
 616                                                LayoutUnit& lineTopIncludingMargins, LayoutUnit& lineBottomIncludingMargins, bool& hasAnnotationsBefore, bool& hasAnnotationsAfter, FontBaseline baselineType)
 617 {
 618     bool isRootBox = isRootInlineBox();
 619     if (isRootBox) {
 620         const FontMetrics& fontMetrics = renderer().style(isFirstLineStyle())->fontMetrics();
 621         // RootInlineBoxes are always placed on at pixel boundaries in their logical y direction. Not doing
 622         // so results in incorrect rendering of text decorations, most notably underlines.
 623         setLogicalTop(roundToInt(top + maxAscent - fontMetrics.ascent(baselineType)));
 624     }
 625
 626     LayoutUnit adjustmentForChildrenWithSameLineHeightAndBaseline = 0;
 627     if (descendantsHaveSameLineHeightAndBaseline()) {
 628         adjustmentForChildrenWithSameLineHeightAndBaseline = logicalTop();
 629         if (parent())
 630             adjustmentForChildrenWithSameLineHeightAndBaseline += (boxModelObject()->borderAndPaddingBefore());
 631     }
 632
 633     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 634         if (curr->renderer().isOutOfFlowPositioned())
 635             continue; // Positioned placeholders don't affect calculations.
 636
 637         if (descendantsHaveSameLineHeightAndBaseline()) {
 638             curr->adjustBlockDirectionPosition(adjustmentForChildrenWithSameLineHeightAndBaseline);
 639             continue;
 640         }
 641
 642         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 643         bool childAffectsTopBottomPos = true;
 644
 645         if (curr->verticalAlign() == TOP && verticalAlignApplies(curr->renderer()))
 646             curr->setLogicalTop(top);
 647         else if (curr->verticalAlign() == BOTTOM && verticalAlignApplies(curr->renderer()))
 648             curr->setLogicalTop(top + maxHeight - curr->lineHeight());
 649         else {
 650             if (!strictMode && inlineFlowBox && !inlineFlowBox->hasTextChildren() && !curr->boxModelObject()->hasInlineDirectionBordersOrPadding()
 651                 && !(inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants()))
 652                 childAffectsTopBottomPos = false;
 653             LayoutUnit posAdjust = maxAscent - curr->baselinePosition(baselineType);
 654             curr->setLogicalTop(curr->logicalTop() + top + posAdjust);
 655         }
 656
 657         LayoutUnit newLogicalTop = curr->logicalTop();
 658         LayoutUnit newLogicalTopIncludingMargins = newLogicalTop;
 659         LayoutUnit boxHeight = curr->logicalHeight();
 660         LayoutUnit boxHeightIncludingMargins = boxHeight;
 661
 662         if (curr->behavesLikeText() || curr->isInlineFlowBox()) {
 663             const FontMetrics& fontMetrics = curr->renderer().style(isFirstLineStyle())->fontMetrics();
 664             newLogicalTop += curr->baselinePosition(baselineType) - fontMetrics.ascent(baselineType);
 665             if (curr->isInlineFlowBox()) {
 666                 RenderBoxModelObject& boxObject = toRenderBoxModelObject(curr->renderer());
 667                 newLogicalTop -= boxObject.style(isFirstLineStyle())->isHorizontalWritingMode()
 668                     ? boxObject.borderTop() + boxObject.paddingTop()
 669                     : boxObject.borderRight() + boxObject.paddingRight();
 670             }
 671             newLogicalTopIncludingMargins = newLogicalTop;
 672         } else if (!curr->renderer().isBR()) {
 673             const RenderBox& box = toRenderBox(curr->renderer());
 674             newLogicalTopIncludingMargins = newLogicalTop;
 675             LayoutUnit overSideMargin = curr->isHorizontal() ? box.marginTop() : box.marginRight();
 676             LayoutUnit underSideMargin = curr->isHorizontal() ? box.marginBottom() : box.marginLeft();
 677             newLogicalTop += overSideMargin;
 678             boxHeightIncludingMargins += overSideMargin + underSideMargin;
 679         }
 680
 681         curr->setLogicalTop(newLogicalTop);
 682
 683         if (childAffectsTopBottomPos) {
 684             if (curr->renderer().isRubyRun()) {
 685                 // Treat the leading on the first and last lines of ruby runs as not being part of the overall lineTop/lineBottom.
 686                 // Really this is a workaround hack for the fact that ruby should have been done as line layout and not done using
 687                 // inline-block.
 688                 if (renderer().style()->isFlippedLinesWritingMode() == (curr->renderer().style()->rubyPosition() == RubyPositionAfter))
 689                     hasAnnotationsBefore = true;
 690                 else
 691                     hasAnnotationsAfter = true;
 692
 693                 RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
 694                 if (RenderRubyBase* rubyBase = rubyRun.rubyBase()) {
 695                     LayoutUnit bottomRubyBaseLeading = (curr->logicalHeight() - rubyBase->logicalBottom()) + rubyBase->logicalHeight() - (rubyBase->lastRootBox() ? rubyBase->lastRootBox()->lineBottom() : LayoutUnit());
 696                     LayoutUnit topRubyBaseLeading = rubyBase->logicalTop() + (rubyBase->firstRootBox() ? rubyBase->firstRootBox()->lineTop() : LayoutUnit());
 697                     newLogicalTop += !renderer().style()->isFlippedLinesWritingMode() ? topRubyBaseLeading : bottomRubyBaseLeading;
 698                     boxHeight -= (topRubyBaseLeading + bottomRubyBaseLeading);
 699                 }
 700             }
 701             if (curr->isInlineTextBox()) {
 702                 TextEmphasisPosition emphasisMarkPosition;
 703                 if (toInlineTextBox(curr)->getEmphasisMarkPosition(curr->renderer().style(isFirstLineStyle()), emphasisMarkPosition)) {
 704                     bool emphasisMarkIsOver = emphasisMarkPosition == TextEmphasisPositionOver;
 705                     if (emphasisMarkIsOver != curr->renderer().style(isFirstLineStyle())->isFlippedLinesWritingMode())
 706                         hasAnnotationsBefore = true;
 707                     else
 708                         hasAnnotationsAfter = true;
 709                 }
 710             }
 711
 712             if (!setLineTop) {
 713                 setLineTop = true;
 714                 lineTop = newLogicalTop;
 715                 lineTopIncludingMargins = min(lineTop, newLogicalTopIncludingMargins);
 716             } else {
 717                 lineTop = min(lineTop, newLogicalTop);
 718                 lineTopIncludingMargins = min(lineTop, min(lineTopIncludingMargins, newLogicalTopIncludingMargins));
 719             }
 720             lineBottom = max(lineBottom, newLogicalTop + boxHeight);
 721             lineBottomIncludingMargins = max(lineBottom, max(lineBottomIncludingMargins, newLogicalTopIncludingMargins + boxHeightIncludingMargins));
 722         }
 723
 724         // Adjust boxes to use their real box y/height and not the logical height (as dictated by
 725         // line-height).
 726         if (inlineFlowBox)
 727             inlineFlowBox->placeBoxesInBlockDirection(top, maxHeight, maxAscent, strictMode, lineTop, lineBottom, setLineTop,
 728                                                       lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType);
 729     }
 730
 731     if (isRootBox) {
 732         if (strictMode || hasTextChildren() || (descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
 733             if (!setLineTop) {
 734                 setLineTop = true;
 735                 lineTop = pixelSnappedLogicalTop();
 736                 lineTopIncludingMargins = lineTop;
 737             } else {
 738                 lineTop = min<LayoutUnit>(lineTop, pixelSnappedLogicalTop());
 739                 lineTopIncludingMargins = min(lineTop, lineTopIncludingMargins);
 740             }
 741             lineBottom = max<LayoutUnit>(lineBottom, pixelSnappedLogicalBottom());
 742             lineBottomIncludingMargins = max(lineBottom, lineBottomIncludingMargins);
 743         }
 744
 745         if (renderer().style()->isFlippedLinesWritingMode())
 746             flipLinesInBlockDirection(lineTopIncludingMargins, lineBottomIncludingMargins);
 747     }
 748 }
 749
 750 #if ENABLE(CSS3_TEXT)
 751 void InlineFlowBox::computeMaxLogicalTop(float& maxLogicalTop) const
 752 {
 753     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 754         if (curr->renderer().isOutOfFlowPositioned())
 755             continue; // Positioned placeholders don't affect calculations.
 756
 757         if (descendantsHaveSameLineHeightAndBaseline())
 758             continue;
 759
 760         maxLogicalTop = max<float>(maxLogicalTop, curr->y());
 761         float localMaxLogicalTop = 0;
 762         if (curr->isInlineFlowBox())
 763             toInlineFlowBox(curr)->computeMaxLogicalTop(localMaxLogicalTop);
 764         maxLogicalTop = max<float>(maxLogicalTop, localMaxLogicalTop);
 765     }
 766 }
 767 #endif // CSS3_TEXT
 768
 769 void InlineFlowBox::flipLinesInBlockDirection(LayoutUnit lineTop, LayoutUnit lineBottom)
 770 {
 771     // Flip the box on the line such that the top is now relative to the lineBottom instead of the lineTop.
 772     setLogicalTop(lineBottom - (logicalTop() - lineTop) - logicalHeight());
 773
 774     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 775         if (curr->renderer().isOutOfFlowPositioned())
 776             continue; // Positioned placeholders aren't affected here.
 777
 778         if (curr->isInlineFlowBox())
 779             toInlineFlowBox(curr)->flipLinesInBlockDirection(lineTop, lineBottom);
 780         else
 781             curr->setLogicalTop(lineBottom - (curr->logicalTop() - lineTop) - curr->logicalHeight());
 782     }
 783 }
 784
 785 inline void InlineFlowBox::addBoxShadowVisualOverflow(LayoutRect& logicalVisualOverflow)
 786 {
 787     // box-shadow on root line boxes is applying to the block and not to the lines.
 788     if (!parent())
 789         return;
 790
 791     RenderStyle* style = renderer().style(isFirstLineStyle());
 792     if (!style->boxShadow())
 793         return;
 794
 795     LayoutUnit boxShadowLogicalTop;
 796     LayoutUnit boxShadowLogicalBottom;
 797     style->getBoxShadowBlockDirectionExtent(boxShadowLogicalTop, boxShadowLogicalBottom);
 798
 799     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite shadow that applies, since
 800     // the line is "upside down" in terms of block coordinates.
 801     LayoutUnit shadowLogicalTop = style->isFlippedLinesWritingMode() ? -boxShadowLogicalBottom : boxShadowLogicalTop;
 802     LayoutUnit shadowLogicalBottom = style->isFlippedLinesWritingMode() ? -boxShadowLogicalTop : boxShadowLogicalBottom;
 803
 804     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() + shadowLogicalTop, logicalVisualOverflow.y());
 805     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + shadowLogicalBottom, logicalVisualOverflow.maxY());
 806
 807     LayoutUnit boxShadowLogicalLeft;
 808     LayoutUnit boxShadowLogicalRight;
 809     style->getBoxShadowInlineDirectionExtent(boxShadowLogicalLeft, boxShadowLogicalRight);
 810
 811     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() + boxShadowLogicalLeft, logicalVisualOverflow.x());
 812     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + boxShadowLogicalRight, logicalVisualOverflow.maxX());
 813
 814     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 815                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 816 }
 817
 818 inline void InlineFlowBox::addBorderOutsetVisualOverflow(LayoutRect& logicalVisualOverflow)
 819 {
 820     // border-image-outset on root line boxes is applying to the block and not to the lines.
 821     if (!parent())
 822         return;
 823
 824     RenderStyle* style = renderer().style(isFirstLineStyle());
 825     if (!style->hasBorderImageOutsets())
 826         return;
 827
 828     LayoutBoxExtent borderOutsets = style->borderImageOutsets();
 829
 830     LayoutUnit borderOutsetLogicalTop = borderOutsets.logicalTop(style->writingMode());
 831     LayoutUnit borderOutsetLogicalBottom = borderOutsets.logicalBottom(style->writingMode());
 832     LayoutUnit borderOutsetLogicalLeft = borderOutsets.logicalLeft(style->writingMode());
 833     LayoutUnit borderOutsetLogicalRight = borderOutsets.logicalRight(style->writingMode());
 834
 835     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite border that applies, since
 836     // the line is "upside down" in terms of block coordinates. vertical-rl and horizontal-bt are the flipped line modes.
 837     LayoutUnit outsetLogicalTop = style->isFlippedLinesWritingMode() ? borderOutsetLogicalBottom : borderOutsetLogicalTop;
 838     LayoutUnit outsetLogicalBottom = style->isFlippedLinesWritingMode() ? borderOutsetLogicalTop : borderOutsetLogicalBottom;
 839
 840     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() - outsetLogicalTop, logicalVisualOverflow.y());
 841     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + outsetLogicalBottom, logicalVisualOverflow.maxY());
 842
 843     LayoutUnit outsetLogicalLeft = includeLogicalLeftEdge() ? borderOutsetLogicalLeft : LayoutUnit();
 844     LayoutUnit outsetLogicalRight = includeLogicalRightEdge() ? borderOutsetLogicalRight : LayoutUnit();
 845
 846     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() - outsetLogicalLeft, logicalVisualOverflow.x());
 847     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + outsetLogicalRight, logicalVisualOverflow.maxX());
 848
 849     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 850                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 851 }
 852
 853 inline void InlineFlowBox::addTextBoxVisualOverflow(InlineTextBox* textBox, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, LayoutRect& logicalVisualOverflow)
 854 {
 855     if (textBox->knownToHaveNoOverflow())
 856         return;
 857
 858     RenderStyle* style = textBox->renderer().style(isFirstLineStyle());
 859
 860     GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(textBox);
 861     GlyphOverflow* glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->value.second;
 862     bool isFlippedLine = style->isFlippedLinesWritingMode();
 863
 864     int topGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->bottom : glyphOverflow->top) : 0;
 865     int bottomGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->top : glyphOverflow->bottom) : 0;
 866     int leftGlyphEdge = glyphOverflow ? glyphOverflow->left : 0;
 867     int rightGlyphEdge = glyphOverflow ? glyphOverflow->right : 0;
 868
 869     int strokeOverflow = static_cast<int>(ceilf(style->textStrokeWidth() / 2.0f));
 870     int topGlyphOverflow = -strokeOverflow - topGlyphEdge;
 871     int bottomGlyphOverflow = strokeOverflow + bottomGlyphEdge;
 872     int leftGlyphOverflow = -strokeOverflow - leftGlyphEdge;
 873     int rightGlyphOverflow = strokeOverflow + rightGlyphEdge;
 874
 875     TextEmphasisPosition emphasisMarkPosition;
 876     if (style->textEmphasisMark() != TextEmphasisMarkNone && textBox->getEmphasisMarkPosition(style, emphasisMarkPosition)) {
 877         int emphasisMarkHeight = style->font().emphasisMarkHeight(style->textEmphasisMarkString());
 878         if ((emphasisMarkPosition == TextEmphasisPositionOver) == (!style->isFlippedLinesWritingMode()))
 879             topGlyphOverflow = min(topGlyphOverflow, -emphasisMarkHeight);
 880         else
 881             bottomGlyphOverflow = max(bottomGlyphOverflow, emphasisMarkHeight);
 882     }
 883
 884     // If letter-spacing is negative, we should factor that into right layout overflow. (Even in RTL, letter-spacing is
 885     // applied to the right, so this is not an issue with left overflow.
 886     rightGlyphOverflow -= min(0, (int)style->font().letterSpacing());
 887
 888     LayoutUnit textShadowLogicalTop;
 889     LayoutUnit textShadowLogicalBottom;
 890     style->getTextShadowBlockDirectionExtent(textShadowLogicalTop, textShadowLogicalBottom);
 891
 892     LayoutUnit childOverflowLogicalTop = min<LayoutUnit>(textShadowLogicalTop + topGlyphOverflow, topGlyphOverflow);
 893     LayoutUnit childOverflowLogicalBottom = max<LayoutUnit>(textShadowLogicalBottom + bottomGlyphOverflow, bottomGlyphOverflow);
 894
 895     LayoutUnit textShadowLogicalLeft;
 896     LayoutUnit textShadowLogicalRight;
 897     style->getTextShadowInlineDirectionExtent(textShadowLogicalLeft, textShadowLogicalRight);
 898
 899     LayoutUnit childOverflowLogicalLeft = min<LayoutUnit>(textShadowLogicalLeft + leftGlyphOverflow, leftGlyphOverflow);
 900     LayoutUnit childOverflowLogicalRight = max<LayoutUnit>(textShadowLogicalRight + rightGlyphOverflow, rightGlyphOverflow);
 901
 902     LayoutUnit logicalTopVisualOverflow = min(textBox->pixelSnappedLogicalTop() + childOverflowLogicalTop, logicalVisualOverflow.y());
 903     LayoutUnit logicalBottomVisualOverflow = max(textBox->pixelSnappedLogicalBottom() + childOverflowLogicalBottom, logicalVisualOverflow.maxY());
 904     LayoutUnit logicalLeftVisualOverflow = min(textBox->pixelSnappedLogicalLeft() + childOverflowLogicalLeft, logicalVisualOverflow.x());
 905     LayoutUnit logicalRightVisualOverflow = max(textBox->pixelSnappedLogicalRight() + childOverflowLogicalRight, logicalVisualOverflow.maxX());
 906
 907     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 908                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 909
 910     textBox->setLogicalOverflowRect(logicalVisualOverflow);
 911 }
 912
 913 inline void InlineFlowBox::addReplacedChildOverflow(const InlineBox* inlineBox, LayoutRect& logicalLayoutOverflow, LayoutRect& logicalVisualOverflow)
 914 {
 915     const RenderBox& box = toRenderBox(inlineBox->renderer());
 916
 917     // Visual overflow only propagates if the box doesn't have a self-painting layer.  This rectangle does not include
 918     // transforms or relative positioning (since those objects always have self-painting layers), but it does need to be adjusted
 919     // for writing-mode differences.
 920     if (!box.hasSelfPaintingLayer()) {
 921         LayoutRect childLogicalVisualOverflow = box.logicalVisualOverflowRectForPropagation(renderer().style());
 922         childLogicalVisualOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 923         logicalVisualOverflow.unite(childLogicalVisualOverflow);
 924     }
 925
 926     // Layout overflow internal to the child box only propagates if the child box doesn't have overflow clip set.
 927     // Otherwise the child border box propagates as layout overflow.  This rectangle must include transforms and relative positioning
 928     // and be adjusted for writing-mode differences.
 929     LayoutRect childLogicalLayoutOverflow = box.logicalLayoutOverflowRectForPropagation(renderer().style());
 930     childLogicalLayoutOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 931     logicalLayoutOverflow.unite(childLogicalLayoutOverflow);
 932 }
 933
 934 void InlineFlowBox::computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 935 {
 936     // If we know we have no overflow, we can just bail.
 937     if (knownToHaveNoOverflow())
 938         return;
 939
 940     // Visual overflow just includes overflow for stuff we need to repaint ourselves.  Self-painting layers are ignored.
 941     // Layout overflow is used to determine scrolling extent, so it still includes child layers and also factors in
 942     // transforms, relative positioning, etc.
 943     LayoutRect logicalLayoutOverflow(enclosingLayoutRect(logicalFrameRectIncludingLineHeight(lineTop, lineBottom)));
 944     LayoutRect logicalVisualOverflow(logicalLayoutOverflow);
 945
 946     addBoxShadowVisualOverflow(logicalVisualOverflow);
 947     addBorderOutsetVisualOverflow(logicalVisualOverflow);
 948
 949     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 950         if (curr->renderer().isOutOfFlowPositioned())
 951             continue; // Positioned placeholders don't affect calculations.
 952
 953         if (curr->renderer().isLineBreak())
 954             continue;
 955         if (curr->renderer().isText()) {
 956             InlineTextBox* text = toInlineTextBox(curr);
 957             LayoutRect textBoxOverflow(enclosingLayoutRect(text->logicalFrameRect()));
 958             addTextBoxVisualOverflow(text, textBoxDataMap, textBoxOverflow);
 959             logicalVisualOverflow.unite(textBoxOverflow);
 960         } else if (curr->renderer().isRenderInline()) {
 961             InlineFlowBox* flow = toInlineFlowBox(curr);
 962             flow->computeOverflow(lineTop, lineBottom, textBoxDataMap);
 963             if (!flow->boxModelObject()->hasSelfPaintingLayer())
 964                 logicalVisualOverflow.unite(flow->logicalVisualOverflowRect(lineTop, lineBottom));
 965             LayoutRect childLayoutOverflow = flow->logicalLayoutOverflowRect(lineTop, lineBottom);
 966             childLayoutOverflow.move(flow->boxModelObject()->relativePositionLogicalOffset());
 967             logicalLayoutOverflow.unite(childLayoutOverflow);
 968         } else
 969             addReplacedChildOverflow(curr, logicalLayoutOverflow, logicalVisualOverflow);
 970     }
 971
 972     setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, lineTop, lineBottom);
 973 }
 974
 975 void InlineFlowBox::setLayoutOverflow(const LayoutRect& rect, LayoutUnit lineTop, LayoutUnit lineBottom)
 976 {
 977     LayoutRect frameBox = enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
 978     if (frameBox.contains(rect) || rect.isEmpty())
 979         return;
 980
 981     if (!m_overflow)
 982         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 983
 984     m_overflow->setLayoutOverflow(rect);
 985 }
 986
 987 void InlineFlowBox::setVisualOverflow(const LayoutRect& rect, LayoutUnit lineTop, LayoutUnit lineBottom)
 988 {
 989     LayoutRect frameBox = enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
 990     if (frameBox.contains(rect) || rect.isEmpty())
 991         return;
 992
 993     if (!m_overflow)
 994         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 995
 996     m_overflow->setVisualOverflow(rect);
 997 }
 998
 999 void InlineFlowBox::setOverflowFromLogicalRects(const LayoutRect& logicalLayoutOverflow, const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom)
1000 {
1001     LayoutRect layoutOverflow(isHorizontal() ? logicalLayoutOverflow : logicalLayoutOverflow.transposedRect());
1002     setLayoutOverflow(layoutOverflow, lineTop, lineBottom);
1003
1004     LayoutRect visualOverflow(isHorizontal() ? logicalVisualOverflow : logicalVisualOverflow.transposedRect());
1005     setVisualOverflow(visualOverflow, lineTop, lineBottom);
1006 }
1007
1008 bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
1009 {
1010     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
1011     flipForWritingMode(overflowRect);
1012     overflowRect.moveBy(accumulatedOffset);
1013     if (!locationInContainer.intersects(overflowRect))
1014         return false;
1015
1016     // Check children first.
1017     // We need to account for culled inline parents of the hit-tested nodes, so that they may also get included in area-based hit-tests.
1018     RenderObject* culledParent = 0;
1019     for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {
1020         if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer()) {
1021             RenderObject* newParent = 0;
1022             // Culled parents are only relevant for area-based hit-tests, so ignore it in point-based ones.
1023             if (locationInContainer.isRectBasedTest()) {
1024                 newParent = curr->renderer().parent();
1025                 if (newParent == &renderer())
1026                     newParent = 0;
1027             }
1028             // Check the culled parent after all its children have been checked, to do this we wait until
1029             // we are about to test an element with a different parent.
1030             if (newParent != culledParent) {
1031                 if (!newParent || !newParent->isDescendantOf(culledParent)) {
1032                     while (culledParent && culledParent != &renderer() && culledParent != newParent) {
1033                         if (culledParent->isRenderInline() && toRenderInline(culledParent)->hitTestCulledInline(request, result, locationInContainer, accumulatedOffset))
1034                             return true;
1035                         culledParent = culledParent->parent();
1036                     }
1037                 }
1038                 culledParent = newParent;
1039             }
1040             if (curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) {
1041                 renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
1042                 return true;
1043             }
1044         }
1045     }
1046     // Check any culled ancestor of the final children tested.
1047     while (culledParent && culledParent != &renderer()) {
1048         if (culledParent->isRenderInline() && toRenderInline(culledParent)->hitTestCulledInline(request, result, locationInContainer, accumulatedOffset))
1049             return true;
1050         culledParent = culledParent->parent();
1051     }
1052
1053     // Now check ourselves. Pixel snap hit testing.
1054     if (!visibleToHitTesting())
1055         return false;
1056
1057     // Do not hittest content beyond the ellipsis box.
1058     if (isRootInlineBox() && hasEllipsisBox()) {
1059         const EllipsisBox* ellipsisBox = root().ellipsisBox();
1060         LayoutRect boundsRect(roundedFrameRect());
1061
1062         if (isHorizontal())
1063             renderer().style()->isLeftToRightDirection() ? boundsRect.shiftXEdgeTo(ellipsisBox->right()) : boundsRect.setWidth(ellipsisBox->left() - left());
1064         else
1065             boundsRect.shiftYEdgeTo(ellipsisBox->right());
1066
1067         flipForWritingMode(boundsRect);
1068         boundsRect.moveBy(accumulatedOffset);
1069         // We are beyond the ellipsis box.
1070         if (locationInContainer.intersects(boundsRect))
1071             return false;
1072     }
1073
1074     LayoutRect frameRect = roundedFrameRect();
1075     LayoutUnit minX = frameRect.x();
1076     LayoutUnit minY = frameRect.y();
1077     LayoutUnit width = frameRect.width();
1078     LayoutUnit height = frameRect.height();
1079
1080     // Constrain our hit testing to the line top and bottom if necessary.
1081     bool noQuirksMode = renderer().document().inNoQuirksMode();
1082     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
1083         RootInlineBox& rootBox = root();
1084         LayoutUnit& top = isHorizontal() ? minY : minX;
1085         LayoutUnit& logicalHeight = isHorizontal() ? height : width;
1086         LayoutUnit bottom = min(rootBox.lineBottom(), top + logicalHeight);
1087         top = max(rootBox.lineTop(), top);
1088         logicalHeight = bottom - top;
1089     }
1090
1091     // Move x/y to our coordinates.
1092     LayoutRect rect(minX, minY, width, height);
1093     flipForWritingMode(rect);
1094     rect.moveBy(accumulatedOffset);
1095
1096     if (locationInContainer.intersects(rect)) {
1097         renderer().updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - toLayoutSize(accumulatedOffset))); // Don't add in m_x or m_y here, we want coords in the containing block's space.
1098         if (!result.addNodeToRectBasedTestResult(renderer().element(), request, locationInContainer, rect))
1099             return true;
1100     }
1101
1102     return false;
1103 }
1104
1105 void InlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
1106 {
1107     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
1108     overflowRect.inflate(renderer().maximalOutlineSize(paintInfo.phase));
1109     flipForWritingMode(overflowRect);
1110     overflowRect.moveBy(paintOffset);
1111
1112     if (!paintInfo.rect.intersects(pixelSnappedIntRect(overflowRect)))
1113         return;
1114
1115     if (paintInfo.phase != PaintPhaseChildOutlines) {
1116         if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) {
1117             // Add ourselves to the paint info struct's list of inlines that need to paint their
1118             // outlines.
1119             if (renderer().style()->visibility() == VISIBLE && renderer().hasOutline() && !isRootInlineBox()) {
1120                 RenderInline& inlineFlow = toRenderInline(renderer());
1121
1122                 RenderBlock* cb = 0;
1123                 bool containingBlockPaintsContinuationOutline = inlineFlow.continuation() || inlineFlow.isInlineElementContinuation();
1124                 if (containingBlockPaintsContinuationOutline) {
1125                     // FIXME: See https://bugs.webkit.org/show_bug.cgi?id=54690. We currently don't reconnect inline continuations
1126                     // after a child removal. As a result, those merged inlines do not get seperated and hence not get enclosed by
1127                     // anonymous blocks. In this case, it is better to bail out and paint it ourself.
1128                     RenderBlock* enclosingAnonymousBlock = renderer().containingBlock();
1129                     if (!enclosingAnonymousBlock->isAnonymousBlock())
1130                         containingBlockPaintsContinuationOutline = false;
1131                     else {
1132                         cb = enclosingAnonymousBlock->containingBlock();
1133                         for (RenderBoxModelObject* box = boxModelObject(); box != cb; box = box->parent()->enclosingBoxModelObject()) {
1134                             if (box->hasSelfPaintingLayer()) {
1135                                 containingBlockPaintsContinuationOutline = false;
1136                                 break;
1137                             }
1138                         }
1139                     }
1140                 }
1141
1142                 if (containingBlockPaintsContinuationOutline) {
1143                     // Add ourselves to the containing block of the entire continuation so that it can
1144                     // paint us atomically.
1145                     cb->addContinuationWithOutline(toRenderInline(renderer().element()->renderer()));
1146                 } else if (!inlineFlow.isInlineElementContinuation())
1147                     paintInfo.outlineObjects->add(&inlineFlow);
1148             }
1149         } else if (paintInfo.phase == PaintPhaseMask) {
1150             paintMask(paintInfo, paintOffset);
1151             return;
1152         } else {
1153             // Paint our background, border and box-shadow.
1154             paintBoxDecorations(paintInfo, paintOffset);
1155         }
1156     }
1157
1158     if (paintInfo.phase == PaintPhaseMask)
1159         return;
1160
1161     PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
1162     PaintInfo childInfo(paintInfo);
1163     childInfo.phase = paintPhase;
1164     childInfo.updateSubtreePaintRootForChildren(&renderer());
1165
1166     // Paint our children.
1167     if (paintPhase != PaintPhaseSelfOutline) {
1168         for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1169             if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
1170                 curr->paint(childInfo, paintOffset, lineTop, lineBottom);
1171         }
1172     }
1173 }
1174
1175 void InlineFlowBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1176 {
1177     if (!fillLayer)
1178         return;
1179     paintFillLayers(paintInfo, c, fillLayer->next(), rect, op);
1180     paintFillLayer(paintInfo, c, fillLayer, rect, op);
1181 }
1182
1183 bool InlineFlowBox::boxShadowCanBeAppliedToBackground(const FillLayer& lastBackgroundLayer) const
1184 {
1185     // The checks here match how paintFillLayer() decides whether to clip (if it does, the shadow
1186     // would be clipped out, so it has to be drawn separately).
1187     StyleImage* image = lastBackgroundLayer.image();
1188     bool hasFillImage = image && image->canRender(&renderer(), renderer().style()->effectiveZoom());
1189     return (!hasFillImage && !renderer().style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent();
1190 }
1191
1192 void InlineFlowBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1193 {
1194     StyleImage* img = fillLayer->image();
1195     bool hasFillImage = img && img->canRender(&renderer(), renderer().style()->effectiveZoom());
1196     if ((!hasFillImage && !renderer().style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent())
1197         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1198 #if ENABLE(CSS_BOX_DECORATION_BREAK)
1199     else if (renderer().style()->boxDecorationBreak() == DCLONE) {
1200         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1201         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1202         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1203     }
1204 #endif
1205     else {
1206         // We have a fill image that spans multiple lines.
1207         // We need to adjust tx and ty by the width of all previous lines.
1208         // Think of background painting on inlines as though you had one long line, a single continuous
1209         // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1210         // as though you had one single line.  This means each line has to pick up the background where
1211         // the previous line left off.
1212         LayoutUnit logicalOffsetOnLine = 0;
1213         LayoutUnit totalLogicalWidth;
1214         if (renderer().style()->direction() == LTR) {
1215             for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1216                 logicalOffsetOnLine += curr->logicalWidth();
1217             totalLogicalWidth = logicalOffsetOnLine;
1218             for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1219                 totalLogicalWidth += curr->logicalWidth();
1220         } else {
1221             for (InlineFlowBox* curr = nextLineBox(); curr; curr = curr->nextLineBox())
1222                 logicalOffsetOnLine += curr->logicalWidth();
1223             totalLogicalWidth = logicalOffsetOnLine;
1224             for (InlineFlowBox* curr = this; curr; curr = curr->prevLineBox())
1225                 totalLogicalWidth += curr->logicalWidth();
1226         }
1227         LayoutUnit stripX = rect.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1228         LayoutUnit stripY = rect.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1229         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : static_cast<LayoutUnit>(width());
1230         LayoutUnit stripHeight = isHorizontal() ? static_cast<LayoutUnit>(height()) : totalLogicalWidth;
1231
1232         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1233         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1234         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, LayoutRect(stripX, stripY, stripWidth, stripHeight), BackgroundBleedNone, this, rect.size(), op);
1235     }
1236 }
1237
1238 void InlineFlowBox::paintBoxShadow(const PaintInfo& info, RenderStyle* s, ShadowStyle shadowStyle, const LayoutRect& paintRect)
1239 {
1240     if ((!prevLineBox() && !nextLineBox()) || !parent())
1241         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle);
1242     else {
1243         // FIXME: We can do better here in the multi-line case. We want to push a clip so that the shadow doesn't
1244         // protrude incorrectly at the edges, and we want to possibly include shadows cast from the previous/following lines
1245         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle, includeLogicalLeftEdge(), includeLogicalRightEdge());
1246     }
1247 }
1248
1249 void InlineFlowBox::constrainToLineTopAndBottomIfNeeded(LayoutRect& rect) const
1250 {
1251     bool noQuirksMode = renderer().document().inNoQuirksMode();
1252     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
1253         const RootInlineBox& rootBox = root();
1254         LayoutUnit logicalTop = isHorizontal() ? rect.y() : rect.x();
1255         LayoutUnit logicalHeight = isHorizontal() ? rect.height() : rect.width();
1256         LayoutUnit bottom = min(rootBox.lineBottom(), logicalTop + logicalHeight);
1257         logicalTop = max(rootBox.lineTop(), logicalTop);
1258         logicalHeight = bottom - logicalTop;
1259         if (isHorizontal()) {
1260             rect.setY(logicalTop);
1261             rect.setHeight(logicalHeight);
1262         } else {
1263             rect.setX(logicalTop);
1264             rect.setWidth(logicalHeight);
1265         }
1266     }
1267 }
1268
1269 static LayoutRect clipRectForNinePieceImageStrip(InlineFlowBox* box, const NinePieceImage& image, const LayoutRect& paintRect)
1270 {
1271     LayoutRect clipRect(paintRect);
1272     RenderStyle* style = box->renderer().style();
1273     LayoutBoxExtent outsets = style->imageOutsets(image);
1274     if (box->isHorizontal()) {
1275         clipRect.setY(paintRect.y() - outsets.top());
1276         clipRect.setHeight(paintRect.height() + outsets.top() + outsets.bottom());
1277         if (box->includeLogicalLeftEdge()) {
1278             clipRect.setX(paintRect.x() - outsets.left());
1279             clipRect.setWidth(paintRect.width() + outsets.left());
1280         }
1281         if (box->includeLogicalRightEdge())
1282             clipRect.setWidth(clipRect.width() + outsets.right());
1283     } else {
1284         clipRect.setX(paintRect.x() - outsets.left());
1285         clipRect.setWidth(paintRect.width() + outsets.left() + outsets.right());
1286         if (box->includeLogicalLeftEdge()) {
1287             clipRect.setY(paintRect.y() - outsets.top());
1288             clipRect.setHeight(paintRect.height() + outsets.top());
1289         }
1290         if (box->includeLogicalRightEdge())
1291             clipRect.setHeight(clipRect.height() + outsets.bottom());
1292     }
1293     return clipRect;
1294 }
1295
1296 void InlineFlowBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1297 {
1298     if (!paintInfo.shouldPaintWithinRoot(&renderer()) || renderer().style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
1299         return;
1300
1301     // Pixel snap background/border painting.
1302     LayoutRect frameRect = roundedFrameRect();
1303
1304     constrainToLineTopAndBottomIfNeeded(frameRect);
1305
1306     // Move x/y to our coordinates.
1307     LayoutRect localRect(frameRect);
1308     flipForWritingMode(localRect);
1309     LayoutPoint adjustedPaintoffset = paintOffset + localRect.location();
1310
1311     GraphicsContext* context = paintInfo.context;
1312
1313     // You can use p::first-line to specify a background. If so, the root line boxes for
1314     // a line may actually have to paint a background.
1315     RenderStyle* styleToUse = renderer().style(isFirstLineStyle());
1316     if ((!parent() && isFirstLineStyle() && styleToUse != renderer().style()) || (parent() && renderer().hasBoxDecorations())) {
1317         LayoutRect paintRect = LayoutRect(adjustedPaintoffset, frameRect.size());
1318         // Shadow comes first and is behind the background and border.
1319         if (!boxModelObject()->boxShadowShouldBeAppliedToBackground(BackgroundBleedNone, this))
1320             paintBoxShadow(paintInfo, styleToUse, Normal, paintRect);
1321
1322         Color c = styleToUse->visitedDependentColor(CSSPropertyBackgroundColor);
1323         paintFillLayers(paintInfo, c, styleToUse->backgroundLayers(), paintRect);
1324         paintBoxShadow(paintInfo, styleToUse, Inset, paintRect);
1325
1326         // :first-line cannot be used to put borders on a line. Always paint borders with our
1327         // non-first-line style.
1328         if (parent() && renderer().style()->hasBorder()) {
1329             const NinePieceImage& borderImage = renderer().style()->borderImage();
1330             StyleImage* borderImageSource = borderImage.image();
1331             bool hasBorderImage = borderImageSource && borderImageSource->canRender(&renderer(), styleToUse->effectiveZoom());
1332             if (hasBorderImage && !borderImageSource->isLoaded())
1333                 return; // Don't paint anything while we wait for the image to load.
1334
1335             // The simple case is where we either have no border image or we are the only box for this object.  In those
1336             // cases only a single call to draw is required.
1337             if (!hasBorderImage || (!prevLineBox() && !nextLineBox()))
1338                 boxModelObject()->paintBorder(paintInfo, paintRect, renderer().style(isFirstLineStyle()), BackgroundBleedNone, includeLogicalLeftEdge(), includeLogicalRightEdge());
1339             else {
1340                 // We have a border image that spans multiple lines.
1341                 // We need to adjust tx and ty by the width of all previous lines.
1342                 // Think of border image painting on inlines as though you had one long line, a single continuous
1343                 // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1344                 // as though you had one single line.  This means each line has to pick up the image where
1345                 // the previous line left off.
1346                 // FIXME: What the heck do we do with RTL here? The math we're using is obviously not right,
1347                 // but it isn't even clear how this should work at all.
1348                 LayoutUnit logicalOffsetOnLine = 0;
1349                 for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1350                     logicalOffsetOnLine += curr->logicalWidth();
1351                 LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1352                 for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1353                     totalLogicalWidth += curr->logicalWidth();
1354                 LayoutUnit stripX = adjustedPaintoffset.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1355                 LayoutUnit stripY = adjustedPaintoffset.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1356                 LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1357                 LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1358
1359                 LayoutRect clipRect = clipRectForNinePieceImageStrip(this, borderImage, paintRect);
1360                 GraphicsContextStateSaver stateSaver(*context);
1361                 context->clip(clipRect);
1362                 boxModelObject()->paintBorder(paintInfo, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(isFirstLineStyle()));
1363             }
1364         }
1365     }
1366 }
1367
1368 void InlineFlowBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1369 {
1370     if (!paintInfo.shouldPaintWithinRoot(&renderer()) || renderer().style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
1371         return;
1372
1373     // Pixel snap mask painting.
1374     LayoutRect frameRect = roundedFrameRect();
1375
1376     constrainToLineTopAndBottomIfNeeded(frameRect);
1377
1378     // Move x/y to our coordinates.
1379     LayoutRect localRect(frameRect);
1380     flipForWritingMode(localRect);
1381     LayoutPoint adjustedPaintOffset = paintOffset + localRect.location();
1382
1383     const NinePieceImage& maskNinePieceImage = renderer().style()->maskBoxImage();
1384     StyleImage* maskBoxImage = renderer().style()->maskBoxImage().image();
1385
1386     // Figure out if we need to push a transparency layer to render our mask.
1387     bool pushTransparencyLayer = false;
1388     bool compositedMask = renderer().hasLayer() && boxModelObject()->layer()->hasCompositedMask();
1389     bool flattenCompositingLayers = renderer().view().frameView().paintBehavior() & PaintBehaviorFlattenCompositingLayers;
1390     CompositeOperator compositeOp = CompositeSourceOver;
1391     if (!compositedMask || flattenCompositingLayers) {
1392         if ((maskBoxImage && renderer().style()->maskLayers()->hasImage()) || renderer().style()->maskLayers()->next())
1393             pushTransparencyLayer = true;
1394
1395         compositeOp = CompositeDestinationIn;
1396         if (pushTransparencyLayer) {
1397             paintInfo.context->setCompositeOperation(CompositeDestinationIn);
1398             paintInfo.context->beginTransparencyLayer(1.0f);
1399             compositeOp = CompositeSourceOver;
1400         }
1401     }
1402
1403     LayoutRect paintRect = LayoutRect(adjustedPaintOffset, frameRect.size());
1404     paintFillLayers(paintInfo, Color(), renderer().style()->maskLayers(), paintRect, compositeOp);
1405
1406     bool hasBoxImage = maskBoxImage && maskBoxImage->canRender(&renderer(), renderer().style()->effectiveZoom());
1407     if (!hasBoxImage || !maskBoxImage->isLoaded()) {
1408         if (pushTransparencyLayer)
1409             paintInfo.context->endTransparencyLayer();
1410         return; // Don't paint anything while we wait for the image to load.
1411     }
1412
1413     // The simple case is where we are the only box for this object.  In those
1414     // cases only a single call to draw is required.
1415     if (!prevLineBox() && !nextLineBox()) {
1416         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(adjustedPaintOffset, frameRect.size()), renderer().style(), maskNinePieceImage, compositeOp);
1417     } else {
1418         // We have a mask image that spans multiple lines.
1419         // We need to adjust _tx and _ty by the width of all previous lines.
1420         LayoutUnit logicalOffsetOnLine = 0;
1421         for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1422             logicalOffsetOnLine += curr->logicalWidth();
1423         LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1424         for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1425             totalLogicalWidth += curr->logicalWidth();
1426         LayoutUnit stripX = adjustedPaintOffset.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1427         LayoutUnit stripY = adjustedPaintOffset.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1428         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1429         LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1430
1431         LayoutRect clipRect = clipRectForNinePieceImageStrip(this, maskNinePieceImage, paintRect);
1432         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1433         paintInfo.context->clip(clipRect);
1434         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(), maskNinePieceImage, compositeOp);
1435     }
1436
1437     if (pushTransparencyLayer)
1438         paintInfo.context->endTransparencyLayer();
1439 }
1440
1441 InlineBox* InlineFlowBox::firstLeafChild() const
1442 {
1443     InlineBox* leaf = 0;
1444     for (InlineBox* child = firstChild(); child && !leaf; child = child->nextOnLine())
1445         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->firstLeafChild();
1446     return leaf;
1447 }
1448
1449 InlineBox* InlineFlowBox::lastLeafChild() const
1450 {
1451     InlineBox* leaf = 0;
1452     for (InlineBox* child = lastChild(); child && !leaf; child = child->prevOnLine())
1453         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->lastLeafChild();
1454     return leaf;
1455 }
1456
1457 RenderObject::SelectionState InlineFlowBox::selectionState()
1458 {
1459     return RenderObject::SelectionNone;
1460 }
1461
1462 bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const
1463 {
1464     for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
1465         if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
1466             return false;
1467     }
1468     return true;
1469 }
1470
1471 float InlineFlowBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox)
1472 {
1473     float result = -1;
1474     // We iterate over all children, the foundBox variable tells us when we've found the
1475     // box containing the ellipsis.  All boxes after that one in the flow are hidden.
1476     // If our flow is ltr then iterate over the boxes from left to right, otherwise iterate
1477     // from right to left. Varying the order allows us to correctly hide the boxes following the ellipsis.
1478     InlineBox* box = ltr ? firstChild() : lastChild();
1479
1480     // NOTE: these will cross after foundBox = true.
1481     int visibleLeftEdge = blockLeftEdge;
1482     int visibleRightEdge = blockRightEdge;
1483
1484     while (box) {
1485         int currResult = box->placeEllipsisBox(ltr, visibleLeftEdge, visibleRightEdge, ellipsisWidth, truncatedWidth, foundBox);
1486         if (currResult != -1 && result == -1)
1487             result = currResult;
1488
1489         if (ltr) {
1490             visibleLeftEdge += box->logicalWidth();
1491             box = box->nextOnLine();
1492         }
1493         else {
1494             visibleRightEdge -= box->logicalWidth();
1495             box = box->prevOnLine();
1496         }
1497     }
1498     return result;
1499 }
1500
1501 void InlineFlowBox::clearTruncation()
1502 {
1503     for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
1504         box->clearTruncation();
1505 }
1506
1507 LayoutUnit InlineFlowBox::computeOverAnnotationAdjustment(LayoutUnit allowedPosition) const
1508 {
1509     LayoutUnit result = 0;
1510     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1511         if (curr->renderer().isOutOfFlowPositioned())
1512             continue; // Positioned placeholders don't affect calculations.
1513
1514         if (curr->isInlineFlowBox())
1515             result = max(result, toInlineFlowBox(curr)->computeOverAnnotationAdjustment(allowedPosition));
1516
1517         if (curr->renderer().isReplaced() && curr->renderer().isRubyRun() && curr->renderer().style()->rubyPosition() == RubyPositionBefore) {
1518             RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
1519             RenderRubyText* rubyText = rubyRun.rubyText();
1520             if (!rubyText)
1521                 continue;
1522
1523             if (!rubyRun.style()->isFlippedLinesWritingMode()) {
1524                 LayoutUnit topOfFirstRubyTextLine = rubyText->logicalTop() + (rubyText->firstRootBox() ? rubyText->firstRootBox()->lineTop() : LayoutUnit());
1525                 if (topOfFirstRubyTextLine >= 0)
1526                     continue;
1527                 topOfFirstRubyTextLine += curr->logicalTop();
1528                 result = max(result, allowedPosition - topOfFirstRubyTextLine);
1529             } else {
1530                 LayoutUnit bottomOfLastRubyTextLine = rubyText->logicalTop() + (rubyText->lastRootBox() ? rubyText->lastRootBox()->lineBottom() : rubyText->logicalHeight());
1531                 if (bottomOfLastRubyTextLine <= curr->logicalHeight())
1532                     continue;
1533                 bottomOfLastRubyTextLine += curr->logicalTop();
1534                 result = max(result, bottomOfLastRubyTextLine - allowedPosition);
1535             }
1536         }
1537
1538         if (curr->isInlineTextBox()) {
1539             RenderStyle* style = curr->renderer().style(isFirstLineStyle());
1540             TextEmphasisPosition emphasisMarkPosition;
1541             if (style->textEmphasisMark() != TextEmphasisMarkNone && toInlineTextBox(curr)->getEmphasisMarkPosition(style, emphasisMarkPosition) && emphasisMarkPosition == TextEmphasisPositionOver) {
1542                 if (!style->isFlippedLinesWritingMode()) {
1543                     int topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1544                     result = max(result, allowedPosition - topOfEmphasisMark);
1545                 } else {
1546                     int bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1547                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1548                 }
1549             }
1550         }
1551     }
1552     return result;
1553 }
1554
1555 LayoutUnit InlineFlowBox::computeUnderAnnotationAdjustment(LayoutUnit allowedPosition) const
1556 {
1557     LayoutUnit result = 0;
1558     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1559         if (curr->renderer().isOutOfFlowPositioned())
1560             continue; // Positioned placeholders don't affect calculations.
1561
1562         if (curr->isInlineFlowBox())
1563             result = max(result, toInlineFlowBox(curr)->computeUnderAnnotationAdjustment(allowedPosition));
1564
1565         if (curr->renderer().isReplaced() && curr->renderer().isRubyRun() && curr->renderer().style()->rubyPosition() == RubyPositionAfter) {
1566             RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
1567             RenderRubyText* rubyText = rubyRun.rubyText();
1568             if (!rubyText)
1569                 continue;
1570
1571             if (rubyRun.style()->isFlippedLinesWritingMode()) {
1572                 LayoutUnit topOfFirstRubyTextLine = rubyText->logicalTop() + (rubyText->firstRootBox() ? rubyText->firstRootBox()->lineTop() : LayoutUnit());
1573                 if (topOfFirstRubyTextLine >= 0)
1574                     continue;
1575                 topOfFirstRubyTextLine += curr->logicalTop();
1576                 result = max(result, allowedPosition - topOfFirstRubyTextLine);
1577             } else {
1578                 LayoutUnit bottomOfLastRubyTextLine = rubyText->logicalTop() + (rubyText->lastRootBox() ? rubyText->lastRootBox()->lineBottom() : rubyText->logicalHeight());
1579                 if (bottomOfLastRubyTextLine <= curr->logicalHeight())
1580                     continue;
1581                 bottomOfLastRubyTextLine += curr->logicalTop();
1582                 result = max(result, bottomOfLastRubyTextLine - allowedPosition);
1583             }
1584         }
1585
1586         if (curr->isInlineTextBox()) {
1587             RenderStyle* style = curr->renderer().style(isFirstLineStyle());
1588             if (style->textEmphasisMark() != TextEmphasisMarkNone && style->textEmphasisPosition() == TextEmphasisPositionUnder) {
1589                 if (!style->isFlippedLinesWritingMode()) {
1590                     LayoutUnit bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1591                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1592                 } else {
1593                     LayoutUnit topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1594                     result = max(result, allowedPosition - topOfEmphasisMark);
1595                 }
1596             }
1597         }
1598     }
1599     return result;
1600 }
1601
1602 void InlineFlowBox::collectLeafBoxesInLogicalOrder(Vector<InlineBox*>& leafBoxesInLogicalOrder, CustomInlineBoxRangeReverse customReverseImplementation, void* userData) const
1603 {
1604     InlineBox* leaf = firstLeafChild();
1605
1606     // FIXME: The reordering code is a copy of parts from BidiResolver::createBidiRunsForLine, operating directly on InlineBoxes, instead of BidiRuns.
1607     // Investigate on how this code could possibly be shared.
1608     unsigned char minLevel = 128;
1609     unsigned char maxLevel = 0;
1610
1611     // First find highest and lowest levels, and initialize leafBoxesInLogicalOrder with the leaf boxes in visual order.
1612     for (; leaf; leaf = leaf->nextLeafChild()) {
1613         minLevel = min(minLevel, leaf->bidiLevel());
1614         maxLevel = max(maxLevel, leaf->bidiLevel());
1615         leafBoxesInLogicalOrder.append(leaf);
1616     }
1617
1618     if (renderer().style()->rtlOrdering() == VisualOrder)
1619         return;
1620
1621     // Reverse of reordering of the line (L2 according to Bidi spec):
1622     // L2. From the highest level found in the text to the lowest odd level on each line,
1623     // reverse any contiguous sequence of characters that are at that level or higher.
1624
1625     // Reversing the reordering of the line is only done up to the lowest odd level.
1626     if (!(minLevel % 2))
1627         ++minLevel;
1628
1629     Vector<InlineBox*>::iterator end = leafBoxesInLogicalOrder.end();
1630     while (minLevel <= maxLevel) {
1631         Vector<InlineBox*>::iterator it = leafBoxesInLogicalOrder.begin();
1632         while (it != end) {
1633             while (it != end) {
1634                 if ((*it)->bidiLevel() >= minLevel)
1635                     break;
1636                 ++it;
1637             }
1638             Vector<InlineBox*>::iterator first = it;
1639             while (it != end) {
1640                 if ((*it)->bidiLevel() < minLevel)
1641                     break;
1642                 ++it;
1643             }
1644             Vector<InlineBox*>::iterator last = it;
1645             if (customReverseImplementation) {
1646                 ASSERT(userData);
1647                 (*customReverseImplementation)(userData, first, last);
1648             } else
1649                 std::reverse(first, last);
1650         }
1651         ++minLevel;
1652     }
1653 }
1654
1655 #ifndef NDEBUG
1656
1657 const char* InlineFlowBox::boxName() const
1658 {
1659     return "InlineFlowBox";
1660 }
1661
1662 void InlineFlowBox::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj, int depth) const
1663 {
1664     InlineBox::showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth);
1665     for (const InlineBox* box = firstChild(); box; box = box->nextOnLine())
1666         box->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth + 1);
1667 }
1668
1669 void InlineFlowBox::checkConsistency() const
1670 {
1671 #ifdef CHECK_CONSISTENCY
1672     ASSERT(!m_hasBadChildList);
1673     const InlineBox* prev = 0;
1674     for (const InlineBox* child = m_firstChild; child; child = child->nextOnLine()) {
1675         ASSERT(child->parent() == this);
1676         ASSERT(child->prevOnLine() == prev);
1677         prev = child;
1678     }
1679     ASSERT(prev == m_lastChild);
1680 #endif
1681 }
1682
1683 #endif
1684
1685 } // namespace WebCore