src/third_party/WebKit/Source/core/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 "core/rendering/InlineFlowBox.h"
  22
  23 #include "core/CSSPropertyNames.h"
  24 #include "core/dom/Document.h"
  25 #include "core/rendering/HitTestResult.h"
  26 #include "core/rendering/InlineTextBox.h"
  27 #include "core/rendering/RenderBlock.h"
  28 #include "core/rendering/RenderInline.h"
  29 #include "core/rendering/RenderLayer.h"
  30 #include "core/rendering/RenderListMarker.h"
  31 #include "core/rendering/RenderRubyBase.h"
  32 #include "core/rendering/RenderRubyRun.h"
  33 #include "core/rendering/RenderRubyText.h"
  34 #include "core/rendering/RenderView.h"
  35 #include "core/rendering/RootInlineBox.h"
  36 #include "platform/fonts/Font.h"
  37 #include "platform/graphics/GraphicsContextStateSaver.h"
  38
  39 #include <math.h>
  40
  41 using namespace std;
  42
  43 namespace WebCore {
  44
  45 struct SameSizeAsInlineFlowBox : public InlineBox {
  46     void* pointers[5];
  47     uint32_t bitfields : 23;
  48 };
  49
  50 COMPILE_ASSERT(sizeof(InlineFlowBox) == sizeof(SameSizeAsInlineFlowBox), InlineFlowBox_should_stay_small);
  51
  52 #ifndef NDEBUG
  53
  54 InlineFlowBox::~InlineFlowBox()
  55 {
  56     if (!m_hasBadChildList)
  57         for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
  58             child->setHasBadParent();
  59 }
  60
  61 #endif
  62
  63 LayoutUnit InlineFlowBox::getFlowSpacingLogicalWidth()
  64 {
  65     LayoutUnit totWidth = marginBorderPaddingLogicalLeft() + marginBorderPaddingLogicalRight();
  66     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
  67         if (curr->isInlineFlowBox())
  68             totWidth += toInlineFlowBox(curr)->getFlowSpacingLogicalWidth();
  69     }
  70     return totWidth;
  71 }
  72
  73 IntRect InlineFlowBox::roundedFrameRect() const
  74 {
  75     // Begin by snapping the x and y coordinates to the nearest pixel.
  76     int snappedX = lroundf(x());
  77     int snappedY = lroundf(y());
  78
  79     int snappedMaxX = lroundf(x() + width());
  80     int snappedMaxY = lroundf(y() + height());
  81
  82     return IntRect(snappedX, snappedY, snappedMaxX - snappedX, snappedMaxY - snappedY);
  83 }
  84
  85 static void setHasTextDescendantsOnAncestors(InlineFlowBox* box)
  86 {
  87     while (box && !box->hasTextDescendants()) {
  88         box->setHasTextDescendants();
  89         box = box->parent();
  90     }
  91 }
  92
  93 void InlineFlowBox::addToLine(InlineBox* child)
  94 {
  95     ASSERT(!child->parent());
  96     ASSERT(!child->nextOnLine());
  97     ASSERT(!child->prevOnLine());
  98     checkConsistency();
  99
 100     child->setParent(this);
 101     if (!m_firstChild) {
 102         m_firstChild = child;
 103         m_lastChild = child;
 104     } else {
 105         m_lastChild->setNextOnLine(child);
 106         child->setPrevOnLine(m_lastChild);
 107         m_lastChild = child;
 108     }
 109     child->setFirstLineStyleBit(isFirstLineStyle());
 110     child->setIsHorizontal(isHorizontal());
 111     if (child->isText()) {
 112         if (child->renderer().parent() == renderer())
 113             m_hasTextChildren = true;
 114         setHasTextDescendantsOnAncestors(this);
 115     } else if (child->isInlineFlowBox()) {
 116         if (toInlineFlowBox(child)->hasTextDescendants())
 117             setHasTextDescendantsOnAncestors(this);
 118     }
 119
 120     if (descendantsHaveSameLineHeightAndBaseline() && !child->renderer().isOutOfFlowPositioned()) {
 121         RenderStyle* parentStyle = renderer().style(isFirstLineStyle());
 122         RenderStyle* childStyle = child->renderer().style(isFirstLineStyle());
 123         bool shouldClearDescendantsHaveSameLineHeightAndBaseline = false;
 124         if (child->renderer().isReplaced())
 125             shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 126         else if (child->isText()) {
 127             if (child->renderer().isBR() || child->renderer().parent() != renderer()) {
 128                 if (!parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 129                     || parentStyle->lineHeight() != childStyle->lineHeight()
 130                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE)
 131                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 132             }
 133             if (childStyle->hasTextCombine() || childStyle->textEmphasisMark() != TextEmphasisMarkNone)
 134                 shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 135         } else {
 136             if (child->renderer().isBR()) {
 137                 // FIXME: This is dumb. We only turn off because current layout test results expect the <br> to be 0-height on the baseline.
 138                 // Other than making a zillion tests have to regenerate results, there's no reason to ditch the optimization here.
 139                 shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 140             } else {
 141                 ASSERT(isInlineFlowBox());
 142                 InlineFlowBox* childFlowBox = toInlineFlowBox(child);
 143                 // Check the child's bit, and then also check for differences in font, line-height, vertical-align
 144                 if (!childFlowBox->descendantsHaveSameLineHeightAndBaseline()
 145                     || !parentStyle->font().fontMetrics().hasIdenticalAscentDescentAndLineGap(childStyle->font().fontMetrics())
 146                     || parentStyle->lineHeight() != childStyle->lineHeight()
 147                     || (parentStyle->verticalAlign() != BASELINE && !isRootInlineBox()) || childStyle->verticalAlign() != BASELINE
 148                     || childStyle->hasBorder() || childStyle->hasPadding() || childStyle->hasTextCombine())
 149                     shouldClearDescendantsHaveSameLineHeightAndBaseline = true;
 150             }
 151         }
 152
 153         if (shouldClearDescendantsHaveSameLineHeightAndBaseline)
 154             clearDescendantsHaveSameLineHeightAndBaseline();
 155     }
 156
 157     if (!child->renderer().isOutOfFlowPositioned()) {
 158         if (child->isText()) {
 159             RenderStyle* childStyle = child->renderer().style(isFirstLineStyle());
 160             if (childStyle->letterSpacing() < 0 || childStyle->textShadow() || childStyle->textEmphasisMark() != TextEmphasisMarkNone || childStyle->textStrokeWidth())
 161                 child->clearKnownToHaveNoOverflow();
 162         } else if (child->renderer().isReplaced()) {
 163             RenderBox& box = toRenderBox(child->renderer());
 164             if (box.hasRenderOverflow() || box.hasSelfPaintingLayer())
 165                 child->clearKnownToHaveNoOverflow();
 166         } else if (!child->renderer().isBR() && (child->renderer().style(isFirstLineStyle())->boxShadow() || child->boxModelObject()->hasSelfPaintingLayer()
 167             || (child->renderer().isListMarker() && !toRenderListMarker(child->renderer()).isInside())
 168             || child->renderer().style(isFirstLineStyle())->hasBorderImageOutsets()
 169             || child->renderer().style(isFirstLineStyle())->hasOutline())) {
 170             child->clearKnownToHaveNoOverflow();
 171         }
 172
 173         if (knownToHaveNoOverflow() && child->isInlineFlowBox() && !toInlineFlowBox(child)->knownToHaveNoOverflow())
 174             clearKnownToHaveNoOverflow();
 175     }
 176
 177     checkConsistency();
 178 }
 179
 180 void InlineFlowBox::removeChild(InlineBox* child, MarkLineBoxes markDirty)
 181 {
 182     checkConsistency();
 183
 184     if (markDirty == MarkLineBoxesDirty && !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()
 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();
 214         child = next;
 215     }
 216 #ifndef NDEBUG
 217     m_firstChild = 0;
 218     m_lastChild = 0;
 219 #endif
 220
 221     removeLineBoxFromRenderObject();
 222     destroy();
 223 }
 224
 225 void InlineFlowBox::removeLineBoxFromRenderObject()
 226 {
 227     rendererLineBoxes()->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     rendererLineBoxes()->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     rendererLineBoxes()->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->slowLastChild() != 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 (renderer().style()->boxDecorationBreak() == DCLONE)
 320                 includeLeftEdge = includeRightEdge = true;
 321             else if (ltr && lineBoxList->firstLineBox() == this)
 322                 includeLeftEdge = true;
 323             else if (!ltr && lineBoxList->lastLineBox() == this)
 324                 includeRightEdge = true;
 325         }
 326
 327         if (!lineBoxList->lastLineBox()->isConstructed()) {
 328             RenderInline& inlineFlow = toRenderInline(renderer());
 329             bool isLastObjectOnLine = !isAnsectorAndWithinBlock(&renderer(), logicallyLastRunRenderer) || (isLastChildForRenderer(&renderer(), logicallyLastRunRenderer) && !isLogicallyLastRunWrapped);
 330
 331             // We include the border under these conditions:
 332             // (1) The next line was not created, or it is constructed. We check the previous line for rtl.
 333             // (2) The logicallyLastRun is not a descendant of this renderer.
 334             // (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.
 335             // (4) The decoration break is set to clone therefore there will be borders on every sides.
 336             if (renderer().style()->boxDecorationBreak() == DCLONE)
 337                 includeLeftEdge = includeRightEdge = true;
 338             else if (ltr) {
 339                 if (!nextLineBox()
 340                     && ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation()))
 341                     includeRightEdge = true;
 342             } else {
 343                 if ((!prevLineBox() || prevLineBox()->isConstructed())
 344                     && ((lastLine || isLastObjectOnLine) && !inlineFlow.continuation()))
 345                     includeLeftEdge = true;
 346             }
 347         }
 348     }
 349
 350     setEdges(includeLeftEdge, includeRightEdge);
 351
 352     // Recur into our children.
 353     for (InlineBox* currChild = firstChild(); currChild; currChild = currChild->nextOnLine()) {
 354         if (currChild->isInlineFlowBox()) {
 355             InlineFlowBox* currFlow = toInlineFlowBox(currChild);
 356             currFlow->determineSpacingForFlowBoxes(lastLine, isLogicallyLastRunWrapped, logicallyLastRunRenderer);
 357         }
 358     }
 359 }
 360
 361 float InlineFlowBox::placeBoxesInInlineDirection(float logicalLeft, bool& needsWordSpacing, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 362 {
 363     // Set our x position.
 364     beginPlacingBoxRangesInInlineDirection(logicalLeft);
 365
 366     float startLogicalLeft = logicalLeft;
 367     logicalLeft += borderLogicalLeft() + paddingLogicalLeft();
 368
 369     float minLogicalLeft = startLogicalLeft;
 370     float maxLogicalRight = logicalLeft;
 371
 372     placeBoxRangeInInlineDirection(firstChild(), 0, logicalLeft, minLogicalLeft, maxLogicalRight, needsWordSpacing, textBoxDataMap);
 373
 374     logicalLeft += borderLogicalRight() + paddingLogicalRight();
 375     endPlacingBoxRangesInInlineDirection(startLogicalLeft, logicalLeft, minLogicalLeft, maxLogicalRight);
 376     return logicalLeft;
 377 }
 378
 379 float InlineFlowBox::placeBoxRangeInInlineDirection(InlineBox* firstChild, InlineBox* lastChild, float& logicalLeft, float& minLogicalLeft, float& maxLogicalRight, bool& needsWordSpacing, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 380 {
 381     for (InlineBox* curr = firstChild; curr && curr != lastChild; curr = curr->nextOnLine()) {
 382         if (curr->renderer().isText()) {
 383             InlineTextBox* text = toInlineTextBox(curr);
 384             RenderText& rt = toRenderText(text->renderer());
 385             if (rt.textLength()) {
 386                 if (needsWordSpacing && isSpaceOrNewline(rt.characterAt(text->start())))
 387                     logicalLeft += rt.style(isFirstLineStyle())->font().fontDescription().wordSpacing();
 388                 needsWordSpacing = !isSpaceOrNewline(rt.characterAt(text->end()));
 389             }
 390             text->setLogicalLeft(logicalLeft);
 391             if (knownToHaveNoOverflow())
 392                 minLogicalLeft = min(logicalLeft, minLogicalLeft);
 393             logicalLeft += text->logicalWidth();
 394             if (knownToHaveNoOverflow())
 395                 maxLogicalRight = max(logicalLeft, maxLogicalRight);
 396         } else {
 397             if (curr->renderer().isOutOfFlowPositioned()) {
 398                 if (curr->renderer().parent()->style()->isLeftToRightDirection()) {
 399                     curr->setLogicalLeft(logicalLeft);
 400                 } else {
 401                     // Our offset that we cache needs to be from the edge of the right border box and
 402                     // not the left border box.  We have to subtract |x| from the width of the block
 403                     // (which can be obtained from the root line box).
 404                     curr->setLogicalLeft(root().block().logicalWidth() - logicalLeft);
 405                 }
 406                 continue; // The positioned object has no effect on the width.
 407             }
 408             if (curr->renderer().isRenderInline()) {
 409                 InlineFlowBox* flow = toInlineFlowBox(curr);
 410                 logicalLeft += flow->marginLogicalLeft();
 411                 if (knownToHaveNoOverflow())
 412                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 413                 logicalLeft = flow->placeBoxesInInlineDirection(logicalLeft, needsWordSpacing, textBoxDataMap);
 414                 if (knownToHaveNoOverflow())
 415                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 416                 logicalLeft += flow->marginLogicalRight();
 417             } else if (!curr->renderer().isListMarker() || toRenderListMarker(curr->renderer()).isInside()) {
 418                 // The box can have a different writing-mode than the overall line, so this is a bit complicated.
 419                 // Just get all the physical margin and overflow values by hand based off |isVertical|.
 420                 LayoutUnit logicalLeftMargin = isHorizontal() ? curr->boxModelObject()->marginLeft() : curr->boxModelObject()->marginTop();
 421                 LayoutUnit logicalRightMargin = isHorizontal() ? curr->boxModelObject()->marginRight() : curr->boxModelObject()->marginBottom();
 422
 423                 logicalLeft += logicalLeftMargin;
 424                 curr->setLogicalLeft(logicalLeft);
 425                 if (knownToHaveNoOverflow())
 426                     minLogicalLeft = min(logicalLeft, minLogicalLeft);
 427                 logicalLeft += curr->logicalWidth();
 428                 if (knownToHaveNoOverflow())
 429                     maxLogicalRight = max(logicalLeft, maxLogicalRight);
 430                 logicalLeft += logicalRightMargin;
 431                 // If we encounter any space after this inline block then ensure it is treated as the space between two words.
 432                 needsWordSpacing = true;
 433             }
 434         }
 435     }
 436     return logicalLeft;
 437 }
 438
 439 bool InlineFlowBox::requiresIdeographicBaseline(const GlyphOverflowAndFallbackFontsMap& textBoxDataMap) const
 440 {
 441     if (isHorizontal())
 442         return false;
 443
 444     if (renderer().style(isFirstLineStyle())->fontDescription().nonCJKGlyphOrientation() == NonCJKGlyphOrientationUpright
 445         || renderer().style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 446         return true;
 447
 448     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 449         if (curr->renderer().isOutOfFlowPositioned())
 450             continue; // Positioned placeholders don't affect calculations.
 451
 452         if (curr->isInlineFlowBox()) {
 453             if (toInlineFlowBox(curr)->requiresIdeographicBaseline(textBoxDataMap))
 454                 return true;
 455         } else {
 456             if (curr->renderer().style(isFirstLineStyle())->font().primaryFont()->hasVerticalGlyphs())
 457                 return true;
 458
 459             const Vector<const SimpleFontData*>* usedFonts = 0;
 460             if (curr->isInlineTextBox()) {
 461                 GlyphOverflowAndFallbackFontsMap::const_iterator it = textBoxDataMap.find(toInlineTextBox(curr));
 462                 usedFonts = it == textBoxDataMap.end() ? 0 : &it->value.first;
 463             }
 464
 465             if (usedFonts) {
 466                 for (size_t i = 0; i < usedFonts->size(); ++i) {
 467                     if (usedFonts->at(i)->hasVerticalGlyphs())
 468                         return true;
 469                 }
 470             }
 471         }
 472     }
 473
 474     return false;
 475 }
 476
 477 void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent, int maxPositionTop, int maxPositionBottom)
 478 {
 479     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 480         // The computed lineheight needs to be extended for the
 481         // positioned elements
 482         if (curr->renderer().isOutOfFlowPositioned())
 483             continue; // Positioned placeholders don't affect calculations.
 484         if (curr->verticalAlign() == TOP || curr->verticalAlign() == BOTTOM) {
 485             int lineHeight = curr->lineHeight();
 486             if (curr->verticalAlign() == TOP) {
 487                 if (maxAscent + maxDescent < lineHeight)
 488                     maxDescent = lineHeight - maxAscent;
 489             }
 490             else {
 491                 if (maxAscent + maxDescent < lineHeight)
 492                     maxAscent = lineHeight - maxDescent;
 493             }
 494
 495             if (maxAscent + maxDescent >= max(maxPositionTop, maxPositionBottom))
 496                 break;
 497         }
 498
 499         if (curr->isInlineFlowBox())
 500             toInlineFlowBox(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
 501     }
 502 }
 503
 504 void InlineFlowBox::computeLogicalBoxHeights(RootInlineBox* rootBox, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom,
 505                                              int& maxAscent, int& maxDescent, bool& setMaxAscent, bool& setMaxDescent,
 506                                              bool strictMode, GlyphOverflowAndFallbackFontsMap& textBoxDataMap,
 507                                              FontBaseline baselineType, VerticalPositionCache& verticalPositionCache)
 508 {
 509     // The primary purpose of this function is to compute the maximal ascent and descent values for
 510     // a line. These values are computed based off the block's line-box-contain property, which indicates
 511     // what parts of descendant boxes have to fit within the line.
 512     //
 513     // The maxAscent value represents the distance of the highest point of any box (typically including line-height) from
 514     // the root box's baseline. The maxDescent value represents the distance of the lowest point of any box
 515     // (also typically including line-height) from the root box baseline. These values can be negative.
 516     //
 517     // A secondary purpose of this function is to store the offset of every box's baseline from the root box's
 518     // baseline. This information is cached in the logicalTop() of every box. We're effectively just using
 519     // the logicalTop() as scratch space.
 520     //
 521     // Because a box can be positioned such that it ends up fully above or fully below the
 522     // root line box, we only consider it to affect the maxAscent and maxDescent values if some
 523     // part of the box (EXCLUDING leading) is above (for ascent) or below (for descent) the root box's baseline.
 524     bool affectsAscent = false;
 525     bool affectsDescent = false;
 526     bool checkChildren = !descendantsHaveSameLineHeightAndBaseline();
 527
 528     if (isRootInlineBox()) {
 529         // Examine our root box.
 530         int ascent = 0;
 531         int descent = 0;
 532         rootBox->ascentAndDescentForBox(rootBox, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 533         if (strictMode || hasTextChildren() || (!checkChildren && hasTextDescendants())) {
 534             if (maxAscent < ascent || !setMaxAscent) {
 535                 maxAscent = ascent;
 536                 setMaxAscent = true;
 537             }
 538             if (maxDescent < descent || !setMaxDescent) {
 539                 maxDescent = descent;
 540                 setMaxDescent = true;
 541             }
 542         }
 543     }
 544
 545     if (!checkChildren)
 546         return;
 547
 548     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 549         if (curr->renderer().isOutOfFlowPositioned())
 550             continue; // Positioned placeholders don't affect calculations.
 551
 552         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 553
 554         bool affectsAscent = false;
 555         bool affectsDescent = false;
 556
 557         // The verticalPositionForBox function returns the distance between the child box's baseline
 558         // and the root box's baseline.  The value is negative if the child box's baseline is above the
 559         // root box's baseline, and it is positive if the child box's baseline is below the root box's baseline.
 560         curr->setLogicalTop(rootBox->verticalPositionForBox(curr, verticalPositionCache).toFloat());
 561
 562         int ascent = 0;
 563         int descent = 0;
 564         rootBox->ascentAndDescentForBox(curr, textBoxDataMap, ascent, descent, affectsAscent, affectsDescent);
 565
 566         LayoutUnit boxHeight = ascent + descent;
 567         if (curr->verticalAlign() == TOP) {
 568             if (maxPositionTop < boxHeight)
 569                 maxPositionTop = boxHeight;
 570         } else if (curr->verticalAlign() == BOTTOM) {
 571             if (maxPositionBottom < boxHeight)
 572                 maxPositionBottom = boxHeight;
 573         } else if (!inlineFlowBox || strictMode || inlineFlowBox->hasTextChildren() || (inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants())
 574                    || inlineFlowBox->boxModelObject()->hasInlineDirectionBordersOrPadding()) {
 575             // Note that these values can be negative.  Even though we only affect the maxAscent and maxDescent values
 576             // if our box (excluding line-height) was above (for ascent) or below (for descent) the root baseline, once you factor in line-height
 577             // the final box can end up being fully above or fully below the root box's baseline!  This is ok, but what it
 578             // means is that ascent and descent (including leading), can end up being negative.  The setMaxAscent and
 579             // setMaxDescent booleans are used to ensure that we're willing to initially set maxAscent/Descent to negative
 580             // values.
 581             ascent -= curr->logicalTop();
 582             descent += curr->logicalTop();
 583             if (affectsAscent && (maxAscent < ascent || !setMaxAscent)) {
 584                 maxAscent = ascent;
 585                 setMaxAscent = true;
 586             }
 587
 588             if (affectsDescent && (maxDescent < descent || !setMaxDescent)) {
 589                 maxDescent = descent;
 590                 setMaxDescent = true;
 591             }
 592         }
 593
 594         if (inlineFlowBox)
 595             inlineFlowBox->computeLogicalBoxHeights(rootBox, maxPositionTop, maxPositionBottom, maxAscent, maxDescent,
 596                                                     setMaxAscent, setMaxDescent, strictMode, textBoxDataMap,
 597                                                     baselineType, verticalPositionCache);
 598     }
 599 }
 600
 601 void InlineFlowBox::placeBoxesInBlockDirection(LayoutUnit top, LayoutUnit maxHeight, int maxAscent, bool strictMode, LayoutUnit& lineTop, LayoutUnit& lineBottom, bool& setLineTop,
 602                                                LayoutUnit& lineTopIncludingMargins, LayoutUnit& lineBottomIncludingMargins, bool& hasAnnotationsBefore, bool& hasAnnotationsAfter, FontBaseline baselineType)
 603 {
 604     bool isRootBox = isRootInlineBox();
 605     if (isRootBox) {
 606         const FontMetrics& fontMetrics = renderer().style(isFirstLineStyle())->fontMetrics();
 607         // RootInlineBoxes are always placed on at pixel boundaries in their logical y direction. Not doing
 608         // so results in incorrect rendering of text decorations, most notably underlines.
 609         setLogicalTop(roundToInt(top + maxAscent - fontMetrics.ascent(baselineType)));
 610     }
 611
 612     LayoutUnit adjustmentForChildrenWithSameLineHeightAndBaseline = 0;
 613     if (descendantsHaveSameLineHeightAndBaseline()) {
 614         adjustmentForChildrenWithSameLineHeightAndBaseline = logicalTop();
 615         if (parent())
 616             adjustmentForChildrenWithSameLineHeightAndBaseline += (boxModelObject()->borderBefore() + boxModelObject()->paddingBefore());
 617     }
 618
 619     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 620         if (curr->renderer().isOutOfFlowPositioned())
 621             continue; // Positioned placeholders don't affect calculations.
 622
 623         if (descendantsHaveSameLineHeightAndBaseline()) {
 624             curr->adjustBlockDirectionPosition(adjustmentForChildrenWithSameLineHeightAndBaseline.toFloat());
 625             continue;
 626         }
 627
 628         InlineFlowBox* inlineFlowBox = curr->isInlineFlowBox() ? toInlineFlowBox(curr) : 0;
 629         bool childAffectsTopBottomPos = true;
 630         if (curr->verticalAlign() == TOP)
 631             curr->setLogicalTop(top.toFloat());
 632         else if (curr->verticalAlign() == BOTTOM)
 633             curr->setLogicalTop((top + maxHeight - curr->lineHeight()).toFloat());
 634         else {
 635             if (!strictMode && inlineFlowBox && !inlineFlowBox->hasTextChildren() && !curr->boxModelObject()->hasInlineDirectionBordersOrPadding()
 636                 && !(inlineFlowBox->descendantsHaveSameLineHeightAndBaseline() && inlineFlowBox->hasTextDescendants()))
 637                 childAffectsTopBottomPos = false;
 638             LayoutUnit posAdjust = maxAscent - curr->baselinePosition(baselineType);
 639             curr->setLogicalTop(curr->logicalTop() + top + posAdjust);
 640         }
 641
 642         LayoutUnit newLogicalTop = curr->logicalTop();
 643         LayoutUnit newLogicalTopIncludingMargins = newLogicalTop;
 644         LayoutUnit boxHeight = curr->logicalHeight();
 645         LayoutUnit boxHeightIncludingMargins = boxHeight;
 646
 647         if (curr->isText() || curr->isInlineFlowBox()) {
 648             const FontMetrics& fontMetrics = curr->renderer().style(isFirstLineStyle())->fontMetrics();
 649             newLogicalTop += curr->baselinePosition(baselineType) - fontMetrics.ascent(baselineType);
 650             if (curr->isInlineFlowBox()) {
 651                 RenderBoxModelObject& boxObject = toRenderBoxModelObject(curr->renderer());
 652                 newLogicalTop -= boxObject.style(isFirstLineStyle())->isHorizontalWritingMode() ? boxObject.borderTop() + boxObject.paddingTop() :
 653                     boxObject.borderRight() + boxObject.paddingRight();
 654             }
 655             newLogicalTopIncludingMargins = newLogicalTop;
 656         } else if (!curr->renderer().isBR()) {
 657             RenderBox& box = toRenderBox(curr->renderer());
 658             newLogicalTopIncludingMargins = newLogicalTop;
 659             LayoutUnit overSideMargin = curr->isHorizontal() ? box.marginTop() : box.marginRight();
 660             LayoutUnit underSideMargin = curr->isHorizontal() ? box.marginBottom() : box.marginLeft();
 661             newLogicalTop += overSideMargin;
 662             boxHeightIncludingMargins += overSideMargin + underSideMargin;
 663         }
 664
 665         curr->setLogicalTop(newLogicalTop.toFloat());
 666
 667         if (childAffectsTopBottomPos) {
 668             if (curr->renderer().isRubyRun()) {
 669                 // Treat the leading on the first and last lines of ruby runs as not being part of the overall lineTop/lineBottom.
 670                 // Really this is a workaround hack for the fact that ruby should have been done as line layout and not done using
 671                 // inline-block.
 672                 if (renderer().style()->isFlippedLinesWritingMode() == (curr->renderer().style()->rubyPosition() == RubyPositionAfter))
 673                     hasAnnotationsBefore = true;
 674                 else
 675                     hasAnnotationsAfter = true;
 676
 677                 RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
 678                 if (RenderRubyBase* rubyBase = rubyRun.rubyBase()) {
 679                     LayoutUnit bottomRubyBaseLeading = (curr->logicalHeight() - rubyBase->logicalBottom()) + rubyBase->logicalHeight() - (rubyBase->lastRootBox() ? rubyBase->lastRootBox()->lineBottom() : LayoutUnit());
 680                     LayoutUnit topRubyBaseLeading = rubyBase->logicalTop() + (rubyBase->firstRootBox() ? rubyBase->firstRootBox()->lineTop() : LayoutUnit());
 681                     newLogicalTop += !renderer().style()->isFlippedLinesWritingMode() ? topRubyBaseLeading : bottomRubyBaseLeading;
 682                     boxHeight -= (topRubyBaseLeading + bottomRubyBaseLeading);
 683                 }
 684             }
 685             if (curr->isInlineTextBox()) {
 686                 TextEmphasisPosition emphasisMarkPosition;
 687                 if (toInlineTextBox(curr)->getEmphasisMarkPosition(curr->renderer().style(isFirstLineStyle()), emphasisMarkPosition)) {
 688                     bool emphasisMarkIsOver = emphasisMarkPosition == TextEmphasisPositionOver;
 689                     if (emphasisMarkIsOver != curr->renderer().style(isFirstLineStyle())->isFlippedLinesWritingMode())
 690                         hasAnnotationsBefore = true;
 691                     else
 692                         hasAnnotationsAfter = true;
 693                 }
 694             }
 695
 696             if (!setLineTop) {
 697                 setLineTop = true;
 698                 lineTop = newLogicalTop;
 699                 lineTopIncludingMargins = min(lineTop, newLogicalTopIncludingMargins);
 700             } else {
 701                 lineTop = min(lineTop, newLogicalTop);
 702                 lineTopIncludingMargins = min(lineTop, min(lineTopIncludingMargins, newLogicalTopIncludingMargins));
 703             }
 704             lineBottom = max(lineBottom, newLogicalTop + boxHeight);
 705             lineBottomIncludingMargins = max(lineBottom, max(lineBottomIncludingMargins, newLogicalTopIncludingMargins + boxHeightIncludingMargins));
 706         }
 707
 708         // Adjust boxes to use their real box y/height and not the logical height (as dictated by
 709         // line-height).
 710         if (inlineFlowBox)
 711             inlineFlowBox->placeBoxesInBlockDirection(top, maxHeight, maxAscent, strictMode, lineTop, lineBottom, setLineTop,
 712                                                       lineTopIncludingMargins, lineBottomIncludingMargins, hasAnnotationsBefore, hasAnnotationsAfter, baselineType);
 713     }
 714
 715     if (isRootBox) {
 716         if (strictMode || hasTextChildren() || (descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
 717             if (!setLineTop) {
 718                 setLineTop = true;
 719                 lineTop = pixelSnappedLogicalTop();
 720                 lineTopIncludingMargins = lineTop;
 721             } else {
 722                 lineTop = min<LayoutUnit>(lineTop, pixelSnappedLogicalTop());
 723                 lineTopIncludingMargins = min(lineTop, lineTopIncludingMargins);
 724             }
 725             lineBottom = max<LayoutUnit>(lineBottom, pixelSnappedLogicalBottom());
 726             lineBottomIncludingMargins = max(lineBottom, lineBottomIncludingMargins);
 727         }
 728
 729         if (renderer().style()->isFlippedLinesWritingMode())
 730             flipLinesInBlockDirection(lineTopIncludingMargins, lineBottomIncludingMargins);
 731     }
 732 }
 733
 734 void InlineFlowBox::computeMaxLogicalTop(float& maxLogicalTop) const
 735 {
 736     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 737         if (curr->renderer().isOutOfFlowPositioned())
 738             continue; // Positioned placeholders don't affect calculations.
 739
 740         if (descendantsHaveSameLineHeightAndBaseline())
 741             continue;
 742
 743         maxLogicalTop = max<float>(maxLogicalTop, curr->y());
 744         float localMaxLogicalTop = 0;
 745         if (curr->isInlineFlowBox())
 746             toInlineFlowBox(curr)->computeMaxLogicalTop(localMaxLogicalTop);
 747         maxLogicalTop = max<float>(maxLogicalTop, localMaxLogicalTop);
 748     }
 749 }
 750
 751 void InlineFlowBox::flipLinesInBlockDirection(LayoutUnit lineTop, LayoutUnit lineBottom)
 752 {
 753     // Flip the box on the line such that the top is now relative to the lineBottom instead of the lineTop.
 754     setLogicalTop(lineBottom - (logicalTop() - lineTop) - logicalHeight());
 755
 756     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 757         if (curr->renderer().isOutOfFlowPositioned())
 758             continue; // Positioned placeholders aren't affected here.
 759
 760         if (curr->isInlineFlowBox())
 761             toInlineFlowBox(curr)->flipLinesInBlockDirection(lineTop, lineBottom);
 762         else
 763             curr->setLogicalTop(lineBottom - (curr->logicalTop() - lineTop) - curr->logicalHeight());
 764     }
 765 }
 766
 767 inline void InlineFlowBox::addBoxShadowVisualOverflow(LayoutRect& logicalVisualOverflow)
 768 {
 769     // box-shadow on root line boxes is applying to the block and not to the lines.
 770     if (!parent())
 771         return;
 772
 773     RenderStyle* style = renderer().style(isFirstLineStyle());
 774     if (!style->boxShadow())
 775         return;
 776
 777     LayoutUnit boxShadowLogicalTop;
 778     LayoutUnit boxShadowLogicalBottom;
 779     style->getBoxShadowBlockDirectionExtent(boxShadowLogicalTop, boxShadowLogicalBottom);
 780
 781     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite shadow that applies, since
 782     // the line is "upside down" in terms of block coordinates.
 783     LayoutUnit shadowLogicalTop = style->isFlippedLinesWritingMode() ? -boxShadowLogicalBottom : boxShadowLogicalTop;
 784     LayoutUnit shadowLogicalBottom = style->isFlippedLinesWritingMode() ? -boxShadowLogicalTop : boxShadowLogicalBottom;
 785
 786     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() + shadowLogicalTop, logicalVisualOverflow.y());
 787     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + shadowLogicalBottom, logicalVisualOverflow.maxY());
 788
 789     LayoutUnit boxShadowLogicalLeft;
 790     LayoutUnit boxShadowLogicalRight;
 791     style->getBoxShadowInlineDirectionExtent(boxShadowLogicalLeft, boxShadowLogicalRight);
 792
 793     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() + boxShadowLogicalLeft, logicalVisualOverflow.x());
 794     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + boxShadowLogicalRight, logicalVisualOverflow.maxX());
 795
 796     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 797                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 798 }
 799
 800 inline void InlineFlowBox::addBorderOutsetVisualOverflow(LayoutRect& logicalVisualOverflow)
 801 {
 802     // border-image-outset on root line boxes is applying to the block and not to the lines.
 803     if (!parent())
 804         return;
 805
 806     RenderStyle* style = renderer().style(isFirstLineStyle());
 807     if (!style->hasBorderImageOutsets())
 808         return;
 809
 810     LayoutBoxExtent borderOutsets = style->borderImageOutsets();
 811
 812     LayoutUnit borderOutsetLogicalTop = borderOutsets.logicalTop(style->writingMode());
 813     LayoutUnit borderOutsetLogicalBottom = borderOutsets.logicalBottom(style->writingMode());
 814     LayoutUnit borderOutsetLogicalLeft = borderOutsets.logicalLeft(style->writingMode());
 815     LayoutUnit borderOutsetLogicalRight = borderOutsets.logicalRight(style->writingMode());
 816
 817     // Similar to how glyph overflow works, if our lines are flipped, then it's actually the opposite border that applies, since
 818     // the line is "upside down" in terms of block coordinates. vertical-rl and horizontal-bt are the flipped line modes.
 819     LayoutUnit outsetLogicalTop = style->isFlippedLinesWritingMode() ? borderOutsetLogicalBottom : borderOutsetLogicalTop;
 820     LayoutUnit outsetLogicalBottom = style->isFlippedLinesWritingMode() ? borderOutsetLogicalTop : borderOutsetLogicalBottom;
 821
 822     LayoutUnit logicalTopVisualOverflow = min(pixelSnappedLogicalTop() - outsetLogicalTop, logicalVisualOverflow.y());
 823     LayoutUnit logicalBottomVisualOverflow = max(pixelSnappedLogicalBottom() + outsetLogicalBottom, logicalVisualOverflow.maxY());
 824
 825     LayoutUnit outsetLogicalLeft = includeLogicalLeftEdge() ? borderOutsetLogicalLeft : LayoutUnit();
 826     LayoutUnit outsetLogicalRight = includeLogicalRightEdge() ? borderOutsetLogicalRight : LayoutUnit();
 827
 828     LayoutUnit logicalLeftVisualOverflow = min(pixelSnappedLogicalLeft() - outsetLogicalLeft, logicalVisualOverflow.x());
 829     LayoutUnit logicalRightVisualOverflow = max(pixelSnappedLogicalRight() + outsetLogicalRight, logicalVisualOverflow.maxX());
 830
 831     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 832                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 833 }
 834
 835 inline void InlineFlowBox::addOutlineVisualOverflow(LayoutRect& logicalVisualOverflow)
 836 {
 837     // Outline on root line boxes is applied to the block and not to the lines.
 838     if (!parent())
 839         return;
 840
 841     RenderStyle* style = renderer().style(isFirstLineStyle());
 842     if (!style->hasOutline())
 843         return;
 844
 845     logicalVisualOverflow.inflate(style->outlineSize());
 846 }
 847
 848 inline void InlineFlowBox::addTextBoxVisualOverflow(InlineTextBox* textBox, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, LayoutRect& logicalVisualOverflow)
 849 {
 850     if (textBox->knownToHaveNoOverflow())
 851         return;
 852
 853     RenderStyle* style = textBox->renderer().style(isFirstLineStyle());
 854
 855     GlyphOverflowAndFallbackFontsMap::iterator it = textBoxDataMap.find(textBox);
 856     GlyphOverflow* glyphOverflow = it == textBoxDataMap.end() ? 0 : &it->value.second;
 857     bool isFlippedLine = style->isFlippedLinesWritingMode();
 858
 859     int topGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->bottom : glyphOverflow->top) : 0;
 860     int bottomGlyphEdge = glyphOverflow ? (isFlippedLine ? glyphOverflow->top : glyphOverflow->bottom) : 0;
 861     int leftGlyphEdge = glyphOverflow ? glyphOverflow->left : 0;
 862     int rightGlyphEdge = glyphOverflow ? glyphOverflow->right : 0;
 863
 864     int strokeOverflow = static_cast<int>(ceilf(style->textStrokeWidth() / 2.0f));
 865     int topGlyphOverflow = -strokeOverflow - topGlyphEdge;
 866     int bottomGlyphOverflow = strokeOverflow + bottomGlyphEdge;
 867     int leftGlyphOverflow = -strokeOverflow - leftGlyphEdge;
 868     int rightGlyphOverflow = strokeOverflow + rightGlyphEdge;
 869
 870     TextEmphasisPosition emphasisMarkPosition;
 871     if (style->textEmphasisMark() != TextEmphasisMarkNone && textBox->getEmphasisMarkPosition(style, emphasisMarkPosition)) {
 872         int emphasisMarkHeight = style->font().emphasisMarkHeight(style->textEmphasisMarkString());
 873         if ((emphasisMarkPosition == TextEmphasisPositionOver) == (!style->isFlippedLinesWritingMode()))
 874             topGlyphOverflow = min(topGlyphOverflow, -emphasisMarkHeight);
 875         else
 876             bottomGlyphOverflow = max(bottomGlyphOverflow, emphasisMarkHeight);
 877     }
 878
 879     // If letter-spacing is negative, we should factor that into right layout overflow. (Even in RTL, letter-spacing is
 880     // applied to the right, so this is not an issue with left overflow.
 881     rightGlyphOverflow -= min(0, (int)style->font().fontDescription().letterSpacing());
 882
 883     LayoutUnit textShadowLogicalTop;
 884     LayoutUnit textShadowLogicalBottom;
 885     style->getTextShadowBlockDirectionExtent(textShadowLogicalTop, textShadowLogicalBottom);
 886
 887     LayoutUnit childOverflowLogicalTop = min<LayoutUnit>(textShadowLogicalTop + topGlyphOverflow, topGlyphOverflow);
 888     LayoutUnit childOverflowLogicalBottom = max<LayoutUnit>(textShadowLogicalBottom + bottomGlyphOverflow, bottomGlyphOverflow);
 889
 890     LayoutUnit textShadowLogicalLeft;
 891     LayoutUnit textShadowLogicalRight;
 892     style->getTextShadowInlineDirectionExtent(textShadowLogicalLeft, textShadowLogicalRight);
 893
 894     LayoutUnit childOverflowLogicalLeft = min<LayoutUnit>(textShadowLogicalLeft + leftGlyphOverflow, leftGlyphOverflow);
 895     LayoutUnit childOverflowLogicalRight = max<LayoutUnit>(textShadowLogicalRight + rightGlyphOverflow, rightGlyphOverflow);
 896
 897     LayoutUnit logicalTopVisualOverflow = min(textBox->pixelSnappedLogicalTop() + childOverflowLogicalTop, logicalVisualOverflow.y());
 898     LayoutUnit logicalBottomVisualOverflow = max(textBox->pixelSnappedLogicalBottom() + childOverflowLogicalBottom, logicalVisualOverflow.maxY());
 899     LayoutUnit logicalLeftVisualOverflow = min(textBox->pixelSnappedLogicalLeft() + childOverflowLogicalLeft, logicalVisualOverflow.x());
 900     LayoutUnit logicalRightVisualOverflow = max(textBox->pixelSnappedLogicalRight() + childOverflowLogicalRight, logicalVisualOverflow.maxX());
 901
 902     logicalVisualOverflow = LayoutRect(logicalLeftVisualOverflow, logicalTopVisualOverflow,
 903                                        logicalRightVisualOverflow - logicalLeftVisualOverflow, logicalBottomVisualOverflow - logicalTopVisualOverflow);
 904
 905     textBox->setLogicalOverflowRect(logicalVisualOverflow);
 906 }
 907
 908 inline void InlineFlowBox::addReplacedChildOverflow(const InlineBox* inlineBox, LayoutRect& logicalLayoutOverflow, LayoutRect& logicalVisualOverflow)
 909 {
 910     RenderBox& box = toRenderBox(inlineBox->renderer());
 911
 912     // Visual overflow only propagates if the box doesn't have a self-painting layer.  This rectangle does not include
 913     // transforms or relative positioning (since those objects always have self-painting layers), but it does need to be adjusted
 914     // for writing-mode differences.
 915     if (!box.hasSelfPaintingLayer()) {
 916         LayoutRect childLogicalVisualOverflow = box.logicalVisualOverflowRectForPropagation(renderer().style());
 917         childLogicalVisualOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 918         logicalVisualOverflow.unite(childLogicalVisualOverflow);
 919     }
 920
 921     // Layout overflow internal to the child box only propagates if the child box doesn't have overflow clip set.
 922     // Otherwise the child border box propagates as layout overflow.  This rectangle must include transforms and relative positioning
 923     // and be adjusted for writing-mode differences.
 924     LayoutRect childLogicalLayoutOverflow = box.logicalLayoutOverflowRectForPropagation(renderer().style());
 925     childLogicalLayoutOverflow.move(inlineBox->logicalLeft(), inlineBox->logicalTop());
 926     logicalLayoutOverflow.unite(childLogicalLayoutOverflow);
 927 }
 928
 929 void InlineFlowBox::computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
 930 {
 931     // If we know we have no overflow, we can just bail.
 932     if (knownToHaveNoOverflow()) {
 933         ASSERT(!m_overflow);
 934         return;
 935     }
 936
 937     if (m_overflow)
 938         m_overflow.clear();
 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     addOutlineVisualOverflow(logicalVisualOverflow);
 949
 950     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
 951         if (curr->renderer().isOutOfFlowPositioned())
 952             continue; // Positioned placeholders don't affect calculations.
 953
 954         if (curr->renderer().isText()) {
 955             InlineTextBox* text = toInlineTextBox(curr);
 956             RenderText& rt = toRenderText(text->renderer());
 957             if (rt.isBR())
 958                 continue;
 959             LayoutRect textBoxOverflow(enclosingLayoutRect(text->logicalFrameRect()));
 960             addTextBoxVisualOverflow(text, textBoxDataMap, textBoxOverflow);
 961             logicalVisualOverflow.unite(textBoxOverflow);
 962         } else if (curr->renderer().isRenderInline()) {
 963             InlineFlowBox* flow = toInlineFlowBox(curr);
 964             flow->computeOverflow(lineTop, lineBottom, textBoxDataMap);
 965             if (!flow->boxModelObject()->hasSelfPaintingLayer())
 966                 logicalVisualOverflow.unite(flow->logicalVisualOverflowRect(lineTop, lineBottom));
 967             LayoutRect childLayoutOverflow = flow->logicalLayoutOverflowRect(lineTop, lineBottom);
 968             childLayoutOverflow.move(flow->boxModelObject()->relativePositionLogicalOffset());
 969             logicalLayoutOverflow.unite(childLayoutOverflow);
 970         } else {
 971             addReplacedChildOverflow(curr, logicalLayoutOverflow, logicalVisualOverflow);
 972         }
 973     }
 974
 975     setOverflowFromLogicalRects(logicalLayoutOverflow, logicalVisualOverflow, lineTop, lineBottom);
 976 }
 977
 978 void InlineFlowBox::setLayoutOverflow(const LayoutRect& rect, const LayoutRect& frameBox)
 979 {
 980     if (frameBox.contains(rect) || rect.isEmpty())
 981         return;
 982
 983     if (!m_overflow)
 984         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 985
 986     m_overflow->setLayoutOverflow(rect);
 987 }
 988
 989 void InlineFlowBox::setVisualOverflow(const LayoutRect& rect, const LayoutRect& frameBox)
 990 {
 991     if (frameBox.contains(rect) || rect.isEmpty())
 992         return;
 993
 994     if (!m_overflow)
 995         m_overflow = adoptPtr(new RenderOverflow(frameBox, frameBox));
 996
 997     m_overflow->setVisualOverflow(rect);
 998 }
 999
1000 void InlineFlowBox::setOverflowFromLogicalRects(const LayoutRect& logicalLayoutOverflow, const LayoutRect& logicalVisualOverflow, LayoutUnit lineTop, LayoutUnit lineBottom)
1001 {
1002     LayoutRect frameBox = enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
1003
1004     LayoutRect layoutOverflow(isHorizontal() ? logicalLayoutOverflow : logicalLayoutOverflow.transposedRect());
1005     setLayoutOverflow(layoutOverflow, frameBox);
1006
1007     LayoutRect visualOverflow(isHorizontal() ? logicalVisualOverflow : logicalVisualOverflow.transposedRect());
1008     setVisualOverflow(visualOverflow, frameBox);
1009 }
1010
1011 bool InlineFlowBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
1012 {
1013     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
1014     flipForWritingMode(overflowRect);
1015     overflowRect.moveBy(accumulatedOffset);
1016     if (!locationInContainer.intersects(overflowRect))
1017         return false;
1018
1019     // Check children first.
1020     // 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.
1021     RenderObject* culledParent = 0;
1022     for (InlineBox* curr = lastChild(); curr; curr = curr->prevOnLine()) {
1023         if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer()) {
1024             RenderObject* newParent = 0;
1025             // Culled parents are only relevant for area-based hit-tests, so ignore it in point-based ones.
1026             if (locationInContainer.isRectBasedTest()) {
1027                 newParent = curr->renderer().parent();
1028                 if (newParent == renderer())
1029                     newParent = 0;
1030             }
1031             // Check the culled parent after all its children have been checked, to do this we wait until
1032             // we are about to test an element with a different parent.
1033             if (newParent != culledParent) {
1034                 if (!newParent || !newParent->isDescendantOf(culledParent)) {
1035                     while (culledParent && culledParent != renderer() && culledParent != newParent) {
1036                         if (culledParent->isRenderInline() && toRenderInline(culledParent)->hitTestCulledInline(request, result, locationInContainer, accumulatedOffset))
1037                             return true;
1038                         culledParent = culledParent->parent();
1039                     }
1040                 }
1041                 culledParent = newParent;
1042             }
1043             if (curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) {
1044                 renderer().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
1045                 return true;
1046             }
1047         }
1048     }
1049     // Check any culled ancestor of the final children tested.
1050     while (culledParent && culledParent != renderer()) {
1051         if (culledParent->isRenderInline() && toRenderInline(culledParent)->hitTestCulledInline(request, result, locationInContainer, accumulatedOffset))
1052             return true;
1053         culledParent = culledParent->parent();
1054     }
1055
1056     // Now check ourselves. Pixel snap hit testing.
1057     LayoutRect frameRect = roundedFrameRect();
1058     LayoutUnit minX = frameRect.x();
1059     LayoutUnit minY = frameRect.y();
1060     LayoutUnit width = frameRect.width();
1061     LayoutUnit height = frameRect.height();
1062
1063     // Constrain our hit testing to the line top and bottom if necessary.
1064     bool noQuirksMode = renderer().document().inNoQuirksMode();
1065     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
1066         RootInlineBox& rootBox = root();
1067         LayoutUnit& top = isHorizontal() ? minY : minX;
1068         LayoutUnit& logicalHeight = isHorizontal() ? height : width;
1069         LayoutUnit bottom = min(rootBox.lineBottom(), top + logicalHeight);
1070         top = max(rootBox.lineTop(), top);
1071         logicalHeight = bottom - top;
1072     }
1073
1074     // Move x/y to our coordinates.
1075     LayoutRect rect(minX, minY, width, height);
1076     flipForWritingMode(rect);
1077     rect.moveBy(accumulatedOffset);
1078
1079     if (visibleToHitTestRequest(request) && locationInContainer.intersects(rect)) {
1080         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.
1081         if (!result.addNodeToRectBasedTestResult(renderer().node(), request, locationInContainer, rect))
1082             return true;
1083     }
1084
1085     return false;
1086 }
1087
1088 void InlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
1089 {
1090     LayoutRect overflowRect(visualOverflowRect(lineTop, lineBottom));
1091     flipForWritingMode(overflowRect);
1092     overflowRect.moveBy(paintOffset);
1093
1094     if (!paintInfo.rect.intersects(pixelSnappedIntRect(overflowRect)))
1095         return;
1096
1097     if (paintInfo.phase != PaintPhaseChildOutlines) {
1098         if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) {
1099             // Add ourselves to the paint info struct's list of inlines that need to paint their
1100             // outlines.
1101             if (renderer().style()->visibility() == VISIBLE && renderer().hasOutline() && !isRootInlineBox()) {
1102                 RenderInline& inlineFlow = toRenderInline(renderer());
1103
1104                 RenderBlock* cb = 0;
1105                 bool containingBlockPaintsContinuationOutline = inlineFlow.continuation() || inlineFlow.isInlineElementContinuation();
1106                 if (containingBlockPaintsContinuationOutline) {
1107                     // FIXME: See https://bugs.webkit.org/show_bug.cgi?id=54690. We currently don't reconnect inline continuations
1108                     // after a child removal. As a result, those merged inlines do not get seperated and hence not get enclosed by
1109                     // anonymous blocks. In this case, it is better to bail out and paint it ourself.
1110                     RenderBlock* enclosingAnonymousBlock = renderer().containingBlock();
1111                     if (!enclosingAnonymousBlock->isAnonymousBlock())
1112                         containingBlockPaintsContinuationOutline = false;
1113                     else {
1114                         cb = enclosingAnonymousBlock->containingBlock();
1115                         for (RenderBoxModelObject* box = boxModelObject(); box != cb; box = box->parent()->enclosingBoxModelObject()) {
1116                             if (box->hasSelfPaintingLayer()) {
1117                                 containingBlockPaintsContinuationOutline = false;
1118                                 break;
1119                             }
1120                         }
1121                     }
1122                 }
1123
1124                 if (containingBlockPaintsContinuationOutline) {
1125                     // Add ourselves to the containing block of the entire continuation so that it can
1126                     // paint us atomically.
1127                     cb->addContinuationWithOutline(toRenderInline(renderer().node()->renderer()));
1128                 } else if (!inlineFlow.isInlineElementContinuation()) {
1129                     paintInfo.outlineObjects()->add(&inlineFlow);
1130                 }
1131             }
1132         } else if (paintInfo.phase == PaintPhaseMask) {
1133             paintMask(paintInfo, paintOffset);
1134             return;
1135         } else {
1136             // Paint our background, border and box-shadow.
1137             paintBoxDecorations(paintInfo, paintOffset);
1138         }
1139     }
1140
1141     if (paintInfo.phase == PaintPhaseMask)
1142         return;
1143
1144     PaintPhase paintPhase = paintInfo.phase == PaintPhaseChildOutlines ? PaintPhaseOutline : paintInfo.phase;
1145
1146     // Paint our children.
1147     if (paintPhase != PaintPhaseSelfOutline) {
1148         PaintInfo childInfo(paintInfo);
1149         childInfo.phase = paintPhase;
1150
1151         if (childInfo.paintingRoot && childInfo.paintingRoot->isDescendantOf(&renderer()))
1152             childInfo.paintingRoot = 0;
1153         else
1154             childInfo.updatePaintingRootForChildren(&renderer());
1155
1156         for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1157             if (curr->renderer().isText() || !curr->boxModelObject()->hasSelfPaintingLayer())
1158                 curr->paint(childInfo, paintOffset, lineTop, lineBottom);
1159         }
1160     }
1161 }
1162
1163 void InlineFlowBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1164 {
1165     if (!fillLayer)
1166         return;
1167     paintFillLayers(paintInfo, c, fillLayer->next(), rect, op);
1168     paintFillLayer(paintInfo, c, fillLayer, rect, op);
1169 }
1170
1171 bool InlineFlowBox::boxShadowCanBeAppliedToBackground(const FillLayer& lastBackgroundLayer) const
1172 {
1173     // The checks here match how paintFillLayer() decides whether to clip (if it does, the shadow
1174     // would be clipped out, so it has to be drawn separately).
1175     StyleImage* image = lastBackgroundLayer.image();
1176     bool hasFillImage = image && image->canRender(renderer(), renderer().style()->effectiveZoom());
1177     return (!hasFillImage && !renderer().style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent();
1178 }
1179
1180 void InlineFlowBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect, CompositeOperator op)
1181 {
1182     StyleImage* img = fillLayer->image();
1183     bool hasFillImage = img && img->canRender(renderer(), renderer().style()->effectiveZoom());
1184     if ((!hasFillImage && !renderer().style()->hasBorderRadius()) || (!prevLineBox() && !nextLineBox()) || !parent()) {
1185         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1186     } else if (renderer().style()->boxDecorationBreak() == DCLONE) {
1187         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1188         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1189         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, rect, BackgroundBleedNone, this, rect.size(), op);
1190     } else {
1191         // We have a fill image that spans multiple lines.
1192         // We need to adjust tx and ty by the width of all previous lines.
1193         // Think of background painting on inlines as though you had one long line, a single continuous
1194         // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1195         // as though you had one single line.  This means each line has to pick up the background where
1196         // the previous line left off.
1197         LayoutUnit logicalOffsetOnLine = 0;
1198         LayoutUnit totalLogicalWidth;
1199         if (renderer().style()->direction() == LTR) {
1200             for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1201                 logicalOffsetOnLine += curr->logicalWidth();
1202             totalLogicalWidth = logicalOffsetOnLine;
1203             for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1204                 totalLogicalWidth += curr->logicalWidth();
1205         } else {
1206             for (InlineFlowBox* curr = nextLineBox(); curr; curr = curr->nextLineBox())
1207                 logicalOffsetOnLine += curr->logicalWidth();
1208             totalLogicalWidth = logicalOffsetOnLine;
1209             for (InlineFlowBox* curr = this; curr; curr = curr->prevLineBox())
1210                 totalLogicalWidth += curr->logicalWidth();
1211         }
1212         LayoutUnit stripX = rect.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1213         LayoutUnit stripY = rect.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1214         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : static_cast<LayoutUnit>(width());
1215         LayoutUnit stripHeight = isHorizontal() ? static_cast<LayoutUnit>(height()) : totalLogicalWidth;
1216
1217         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1218         paintInfo.context->clip(LayoutRect(rect.x(), rect.y(), width(), height()));
1219         boxModelObject()->paintFillLayerExtended(paintInfo, c, fillLayer, LayoutRect(stripX, stripY, stripWidth, stripHeight), BackgroundBleedNone, this, rect.size(), op);
1220     }
1221 }
1222
1223 void InlineFlowBox::paintBoxShadow(const PaintInfo& info, RenderStyle* s, ShadowStyle shadowStyle, const LayoutRect& paintRect)
1224 {
1225     if ((!prevLineBox() && !nextLineBox()) || !parent())
1226         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle);
1227     else {
1228         // FIXME: We can do better here in the multi-line case. We want to push a clip so that the shadow doesn't
1229         // protrude incorrectly at the edges, and we want to possibly include shadows cast from the previous/following lines
1230         boxModelObject()->paintBoxShadow(info, paintRect, s, shadowStyle, includeLogicalLeftEdge(), includeLogicalRightEdge());
1231     }
1232 }
1233
1234 void InlineFlowBox::constrainToLineTopAndBottomIfNeeded(LayoutRect& rect) const
1235 {
1236     bool noQuirksMode = renderer().document().inNoQuirksMode();
1237     if (!noQuirksMode && !hasTextChildren() && !(descendantsHaveSameLineHeightAndBaseline() && hasTextDescendants())) {
1238         const RootInlineBox& rootBox = root();
1239         LayoutUnit logicalTop = isHorizontal() ? rect.y() : rect.x();
1240         LayoutUnit logicalHeight = isHorizontal() ? rect.height() : rect.width();
1241         LayoutUnit bottom = min(rootBox.lineBottom(), logicalTop + logicalHeight);
1242         logicalTop = max(rootBox.lineTop(), logicalTop);
1243         logicalHeight = bottom - logicalTop;
1244         if (isHorizontal()) {
1245             rect.setY(logicalTop);
1246             rect.setHeight(logicalHeight);
1247         } else {
1248             rect.setX(logicalTop);
1249             rect.setWidth(logicalHeight);
1250         }
1251     }
1252 }
1253
1254 static LayoutRect clipRectForNinePieceImageStrip(InlineFlowBox* box, const NinePieceImage& image, const LayoutRect& paintRect)
1255 {
1256     LayoutRect clipRect(paintRect);
1257     RenderStyle* style = box->renderer().style();
1258     LayoutBoxExtent outsets = style->imageOutsets(image);
1259     if (box->isHorizontal()) {
1260         clipRect.setY(paintRect.y() - outsets.top());
1261         clipRect.setHeight(paintRect.height() + outsets.top() + outsets.bottom());
1262         if (box->includeLogicalLeftEdge()) {
1263             clipRect.setX(paintRect.x() - outsets.left());
1264             clipRect.setWidth(paintRect.width() + outsets.left());
1265         }
1266         if (box->includeLogicalRightEdge())
1267             clipRect.setWidth(clipRect.width() + outsets.right());
1268     } else {
1269         clipRect.setX(paintRect.x() - outsets.left());
1270         clipRect.setWidth(paintRect.width() + outsets.left() + outsets.right());
1271         if (box->includeLogicalLeftEdge()) {
1272             clipRect.setY(paintRect.y() - outsets.top());
1273             clipRect.setHeight(paintRect.height() + outsets.top());
1274         }
1275         if (box->includeLogicalRightEdge())
1276             clipRect.setHeight(clipRect.height() + outsets.bottom());
1277     }
1278     return clipRect;
1279 }
1280
1281 void InlineFlowBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1282 {
1283     if (!paintInfo.shouldPaintWithinRoot(&renderer()) || renderer().style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseForeground)
1284         return;
1285
1286     // Pixel snap background/border painting.
1287     LayoutRect frameRect = roundedFrameRect();
1288
1289     constrainToLineTopAndBottomIfNeeded(frameRect);
1290
1291     // Move x/y to our coordinates.
1292     LayoutRect localRect(frameRect);
1293     flipForWritingMode(localRect);
1294     LayoutPoint adjustedPaintoffset = paintOffset + localRect.location();
1295
1296     GraphicsContext* context = paintInfo.context;
1297
1298     // You can use p::first-line to specify a background. If so, the root line boxes for
1299     // a line may actually have to paint a background.
1300     RenderStyle* styleToUse = renderer().style(isFirstLineStyle());
1301     if ((!parent() && isFirstLineStyle() && styleToUse != renderer().style()) || (parent() && renderer().hasBoxDecorations())) {
1302         LayoutRect paintRect = LayoutRect(adjustedPaintoffset, frameRect.size());
1303         // Shadow comes first and is behind the background and border.
1304         if (!boxModelObject()->boxShadowShouldBeAppliedToBackground(BackgroundBleedNone, this))
1305             paintBoxShadow(paintInfo, styleToUse, Normal, paintRect);
1306
1307         Color c = renderer().resolveColor(styleToUse, CSSPropertyBackgroundColor);
1308         paintFillLayers(paintInfo, c, styleToUse->backgroundLayers(), paintRect);
1309         paintBoxShadow(paintInfo, styleToUse, Inset, paintRect);
1310
1311         // :first-line cannot be used to put borders on a line. Always paint borders with our
1312         // non-first-line style.
1313         if (parent() && renderer().style()->hasBorder()) {
1314             const NinePieceImage& borderImage = renderer().style()->borderImage();
1315             StyleImage* borderImageSource = borderImage.image();
1316             bool hasBorderImage = borderImageSource && borderImageSource->canRender(renderer(), styleToUse->effectiveZoom());
1317             if (hasBorderImage && !borderImageSource->isLoaded())
1318                 return; // Don't paint anything while we wait for the image to load.
1319
1320             // The simple case is where we either have no border image or we are the only box for this object.  In those
1321             // cases only a single call to draw is required.
1322             if (!hasBorderImage || (!prevLineBox() && !nextLineBox()))
1323                 boxModelObject()->paintBorder(paintInfo, paintRect, renderer().style(isFirstLineStyle()), BackgroundBleedNone, includeLogicalLeftEdge(), includeLogicalRightEdge());
1324             else {
1325                 // We have a border image that spans multiple lines.
1326                 // We need to adjust tx and ty by the width of all previous lines.
1327                 // Think of border image painting on inlines as though you had one long line, a single continuous
1328                 // strip.  Even though that strip has been broken up across multiple lines, you still paint it
1329                 // as though you had one single line.  This means each line has to pick up the image where
1330                 // the previous line left off.
1331                 // FIXME: What the heck do we do with RTL here? The math we're using is obviously not right,
1332                 // but it isn't even clear how this should work at all.
1333                 LayoutUnit logicalOffsetOnLine = 0;
1334                 for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1335                     logicalOffsetOnLine += curr->logicalWidth();
1336                 LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1337                 for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1338                     totalLogicalWidth += curr->logicalWidth();
1339                 LayoutUnit stripX = adjustedPaintoffset.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1340                 LayoutUnit stripY = adjustedPaintoffset.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1341                 LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1342                 LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1343
1344                 LayoutRect clipRect = clipRectForNinePieceImageStrip(this, borderImage, paintRect);
1345                 GraphicsContextStateSaver stateSaver(*context);
1346                 context->clip(clipRect);
1347                 boxModelObject()->paintBorder(paintInfo, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(isFirstLineStyle()));
1348             }
1349         }
1350     }
1351 }
1352
1353 void InlineFlowBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
1354 {
1355     if (!paintInfo.shouldPaintWithinRoot(&renderer()) || renderer().style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
1356         return;
1357
1358     // Pixel snap mask painting.
1359     LayoutRect frameRect = roundedFrameRect();
1360
1361     constrainToLineTopAndBottomIfNeeded(frameRect);
1362
1363     // Move x/y to our coordinates.
1364     LayoutRect localRect(frameRect);
1365     flipForWritingMode(localRect);
1366     LayoutPoint adjustedPaintOffset = paintOffset + localRect.location();
1367
1368     const NinePieceImage& maskNinePieceImage = renderer().style()->maskBoxImage();
1369     StyleImage* maskBoxImage = renderer().style()->maskBoxImage().image();
1370
1371     // Figure out if we need to push a transparency layer to render our mask.
1372     bool pushTransparencyLayer = false;
1373     bool compositedMask = renderer().hasLayer() && boxModelObject()->layer()->hasCompositedMask();
1374     bool flattenCompositingLayers = renderer().view()->frameView() && renderer().view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
1375     CompositeOperator compositeOp = CompositeSourceOver;
1376     if (!compositedMask || flattenCompositingLayers) {
1377         if ((maskBoxImage && renderer().style()->maskLayers()->hasImage()) || renderer().style()->maskLayers()->next())
1378             pushTransparencyLayer = true;
1379
1380         compositeOp = CompositeDestinationIn;
1381         if (pushTransparencyLayer) {
1382             paintInfo.context->setCompositeOperation(CompositeDestinationIn);
1383             paintInfo.context->beginTransparencyLayer(1.0f);
1384             compositeOp = CompositeSourceOver;
1385         }
1386     }
1387
1388     LayoutRect paintRect = LayoutRect(adjustedPaintOffset, frameRect.size());
1389     paintFillLayers(paintInfo, Color::transparent, renderer().style()->maskLayers(), paintRect, compositeOp);
1390
1391     bool hasBoxImage = maskBoxImage && maskBoxImage->canRender(renderer(), renderer().style()->effectiveZoom());
1392     if (!hasBoxImage || !maskBoxImage->isLoaded()) {
1393         if (pushTransparencyLayer)
1394             paintInfo.context->endLayer();
1395         return; // Don't paint anything while we wait for the image to load.
1396     }
1397
1398     // The simple case is where we are the only box for this object.  In those
1399     // cases only a single call to draw is required.
1400     if (!prevLineBox() && !nextLineBox()) {
1401         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(adjustedPaintOffset, frameRect.size()), renderer().style(), maskNinePieceImage, compositeOp);
1402     } else {
1403         // We have a mask image that spans multiple lines.
1404         // We need to adjust _tx and _ty by the width of all previous lines.
1405         LayoutUnit logicalOffsetOnLine = 0;
1406         for (InlineFlowBox* curr = prevLineBox(); curr; curr = curr->prevLineBox())
1407             logicalOffsetOnLine += curr->logicalWidth();
1408         LayoutUnit totalLogicalWidth = logicalOffsetOnLine;
1409         for (InlineFlowBox* curr = this; curr; curr = curr->nextLineBox())
1410             totalLogicalWidth += curr->logicalWidth();
1411         LayoutUnit stripX = adjustedPaintOffset.x() - (isHorizontal() ? logicalOffsetOnLine : LayoutUnit());
1412         LayoutUnit stripY = adjustedPaintOffset.y() - (isHorizontal() ? LayoutUnit() : logicalOffsetOnLine);
1413         LayoutUnit stripWidth = isHorizontal() ? totalLogicalWidth : frameRect.width();
1414         LayoutUnit stripHeight = isHorizontal() ? frameRect.height() : totalLogicalWidth;
1415
1416         LayoutRect clipRect = clipRectForNinePieceImageStrip(this, maskNinePieceImage, paintRect);
1417         GraphicsContextStateSaver stateSaver(*paintInfo.context);
1418         paintInfo.context->clip(clipRect);
1419         boxModelObject()->paintNinePieceImage(paintInfo.context, LayoutRect(stripX, stripY, stripWidth, stripHeight), renderer().style(), maskNinePieceImage, compositeOp);
1420     }
1421
1422     if (pushTransparencyLayer)
1423         paintInfo.context->endLayer();
1424 }
1425
1426 InlineBox* InlineFlowBox::firstLeafChild() const
1427 {
1428     InlineBox* leaf = 0;
1429     for (InlineBox* child = firstChild(); child && !leaf; child = child->nextOnLine())
1430         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->firstLeafChild();
1431     return leaf;
1432 }
1433
1434 InlineBox* InlineFlowBox::lastLeafChild() const
1435 {
1436     InlineBox* leaf = 0;
1437     for (InlineBox* child = lastChild(); child && !leaf; child = child->prevOnLine())
1438         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->lastLeafChild();
1439     return leaf;
1440 }
1441
1442 RenderObject::SelectionState InlineFlowBox::selectionState()
1443 {
1444     return RenderObject::SelectionNone;
1445 }
1446
1447 bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const
1448 {
1449     for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
1450         if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
1451             return false;
1452     }
1453     return true;
1454 }
1455
1456 float InlineFlowBox::placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox)
1457 {
1458     float result = -1;
1459     // We iterate over all children, the foundBox variable tells us when we've found the
1460     // box containing the ellipsis.  All boxes after that one in the flow are hidden.
1461     // If our flow is ltr then iterate over the boxes from left to right, otherwise iterate
1462     // from right to left. Varying the order allows us to correctly hide the boxes following the ellipsis.
1463     InlineBox* box = ltr ? firstChild() : lastChild();
1464
1465     // NOTE: these will cross after foundBox = true.
1466     int visibleLeftEdge = blockLeftEdge;
1467     int visibleRightEdge = blockRightEdge;
1468
1469     while (box) {
1470         int currResult = box->placeEllipsisBox(ltr, visibleLeftEdge, visibleRightEdge, ellipsisWidth, truncatedWidth, foundBox);
1471         if (currResult != -1 && result == -1)
1472             result = currResult;
1473
1474         if (ltr) {
1475             visibleLeftEdge += box->logicalWidth();
1476             box = box->nextOnLine();
1477         }
1478         else {
1479             visibleRightEdge -= box->logicalWidth();
1480             box = box->prevOnLine();
1481         }
1482     }
1483     return result;
1484 }
1485
1486 void InlineFlowBox::clearTruncation()
1487 {
1488     for (InlineBox *box = firstChild(); box; box = box->nextOnLine())
1489         box->clearTruncation();
1490 }
1491
1492 LayoutUnit InlineFlowBox::computeOverAnnotationAdjustment(LayoutUnit allowedPosition) const
1493 {
1494     LayoutUnit result = 0;
1495     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1496         if (curr->renderer().isOutOfFlowPositioned())
1497             continue; // Positioned placeholders don't affect calculations.
1498
1499         if (curr->isInlineFlowBox())
1500             result = max(result, toInlineFlowBox(curr)->computeOverAnnotationAdjustment(allowedPosition));
1501
1502         if (curr->renderer().isReplaced() && curr->renderer().isRubyRun() && curr->renderer().style()->rubyPosition() == RubyPositionBefore) {
1503             RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
1504             RenderRubyText* rubyText = rubyRun.rubyText();
1505             if (!rubyText)
1506                 continue;
1507
1508             if (!rubyRun.style()->isFlippedLinesWritingMode()) {
1509                 LayoutUnit topOfFirstRubyTextLine = rubyText->logicalTop() + (rubyText->firstRootBox() ? rubyText->firstRootBox()->lineTop() : LayoutUnit());
1510                 if (topOfFirstRubyTextLine >= 0)
1511                     continue;
1512                 topOfFirstRubyTextLine += curr->logicalTop();
1513                 result = max(result, allowedPosition - topOfFirstRubyTextLine);
1514             } else {
1515                 LayoutUnit bottomOfLastRubyTextLine = rubyText->logicalTop() + (rubyText->lastRootBox() ? rubyText->lastRootBox()->lineBottom() : rubyText->logicalHeight());
1516                 if (bottomOfLastRubyTextLine <= curr->logicalHeight())
1517                     continue;
1518                 bottomOfLastRubyTextLine += curr->logicalTop();
1519                 result = max(result, bottomOfLastRubyTextLine - allowedPosition);
1520             }
1521         }
1522
1523         if (curr->isInlineTextBox()) {
1524             RenderStyle* style = curr->renderer().style(isFirstLineStyle());
1525             TextEmphasisPosition emphasisMarkPosition;
1526             if (style->textEmphasisMark() != TextEmphasisMarkNone && toInlineTextBox(curr)->getEmphasisMarkPosition(style, emphasisMarkPosition) && emphasisMarkPosition == TextEmphasisPositionOver) {
1527                 if (!style->isFlippedLinesWritingMode()) {
1528                     int topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1529                     result = max(result, allowedPosition - topOfEmphasisMark);
1530                 } else {
1531                     int bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1532                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1533                 }
1534             }
1535         }
1536     }
1537     return result;
1538 }
1539
1540 LayoutUnit InlineFlowBox::computeUnderAnnotationAdjustment(LayoutUnit allowedPosition) const
1541 {
1542     LayoutUnit result = 0;
1543     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
1544         if (curr->renderer().isOutOfFlowPositioned())
1545             continue; // Positioned placeholders don't affect calculations.
1546
1547         if (curr->isInlineFlowBox())
1548             result = max(result, toInlineFlowBox(curr)->computeUnderAnnotationAdjustment(allowedPosition));
1549
1550         if (curr->renderer().isReplaced() && curr->renderer().isRubyRun() && curr->renderer().style()->rubyPosition() == RubyPositionAfter) {
1551             RenderRubyRun& rubyRun = toRenderRubyRun(curr->renderer());
1552             RenderRubyText* rubyText = rubyRun.rubyText();
1553             if (!rubyText)
1554                 continue;
1555
1556             if (rubyRun.style()->isFlippedLinesWritingMode()) {
1557                 LayoutUnit topOfFirstRubyTextLine = rubyText->logicalTop() + (rubyText->firstRootBox() ? rubyText->firstRootBox()->lineTop() : LayoutUnit());
1558                 if (topOfFirstRubyTextLine >= 0)
1559                     continue;
1560                 topOfFirstRubyTextLine += curr->logicalTop();
1561                 result = max(result, allowedPosition - topOfFirstRubyTextLine);
1562             } else {
1563                 LayoutUnit bottomOfLastRubyTextLine = rubyText->logicalTop() + (rubyText->lastRootBox() ? rubyText->lastRootBox()->lineBottom() : rubyText->logicalHeight());
1564                 if (bottomOfLastRubyTextLine <= curr->logicalHeight())
1565                     continue;
1566                 bottomOfLastRubyTextLine += curr->logicalTop();
1567                 result = max(result, bottomOfLastRubyTextLine - allowedPosition);
1568             }
1569         }
1570
1571         if (curr->isInlineTextBox()) {
1572             RenderStyle* style = curr->renderer().style(isFirstLineStyle());
1573             if (style->textEmphasisMark() != TextEmphasisMarkNone && style->textEmphasisPosition() == TextEmphasisPositionUnder) {
1574                 if (!style->isFlippedLinesWritingMode()) {
1575                     LayoutUnit bottomOfEmphasisMark = curr->logicalBottom() + style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1576                     result = max(result, bottomOfEmphasisMark - allowedPosition);
1577                 } else {
1578                     LayoutUnit topOfEmphasisMark = curr->logicalTop() - style->font().emphasisMarkHeight(style->textEmphasisMarkString());
1579                     result = max(result, allowedPosition - topOfEmphasisMark);
1580                 }
1581             }
1582         }
1583     }
1584     return result;
1585 }
1586
1587 void InlineFlowBox::collectLeafBoxesInLogicalOrder(Vector<InlineBox*>& leafBoxesInLogicalOrder, CustomInlineBoxRangeReverse customReverseImplementation, void* userData) const
1588 {
1589     InlineBox* leaf = firstLeafChild();
1590
1591     // FIXME: The reordering code is a copy of parts from BidiResolver::createBidiRunsForLine, operating directly on InlineBoxes, instead of BidiRuns.
1592     // Investigate on how this code could possibly be shared.
1593     unsigned char minLevel = 128;
1594     unsigned char maxLevel = 0;
1595
1596     // First find highest and lowest levels, and initialize leafBoxesInLogicalOrder with the leaf boxes in visual order.
1597     for (; leaf; leaf = leaf->nextLeafChild()) {
1598         minLevel = min(minLevel, leaf->bidiLevel());
1599         maxLevel = max(maxLevel, leaf->bidiLevel());
1600         leafBoxesInLogicalOrder.append(leaf);
1601     }
1602
1603     if (renderer().style()->rtlOrdering() == VisualOrder)
1604         return;
1605
1606     // Reverse of reordering of the line (L2 according to Bidi spec):
1607     // L2. From the highest level found in the text to the lowest odd level on each line,
1608     // reverse any contiguous sequence of characters that are at that level or higher.
1609
1610     // Reversing the reordering of the line is only done up to the lowest odd level.
1611     if (!(minLevel % 2))
1612         ++minLevel;
1613
1614     Vector<InlineBox*>::iterator end = leafBoxesInLogicalOrder.end();
1615     while (minLevel <= maxLevel) {
1616         Vector<InlineBox*>::iterator it = leafBoxesInLogicalOrder.begin();
1617         while (it != end) {
1618             while (it != end) {
1619                 if ((*it)->bidiLevel() >= minLevel)
1620                     break;
1621                 ++it;
1622             }
1623             Vector<InlineBox*>::iterator first = it;
1624             while (it != end) {
1625                 if ((*it)->bidiLevel() < minLevel)
1626                     break;
1627                 ++it;
1628             }
1629             Vector<InlineBox*>::iterator last = it;
1630             if (customReverseImplementation) {
1631                 ASSERT(userData);
1632                 (*customReverseImplementation)(userData, first, last);
1633             } else
1634                 std::reverse(first, last);
1635         }
1636         ++minLevel;
1637     }
1638 }
1639
1640 #ifndef NDEBUG
1641
1642 const char* InlineFlowBox::boxName() const
1643 {
1644     return "InlineFlowBox";
1645 }
1646
1647 void InlineFlowBox::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj, int depth) const
1648 {
1649     InlineBox::showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth);
1650     for (const InlineBox* box = firstChild(); box; box = box->nextOnLine())
1651         box->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, depth + 1);
1652 }
1653
1654 void InlineFlowBox::checkConsistency() const
1655 {
1656 #ifdef CHECK_CONSISTENCY
1657     ASSERT(!m_hasBadChildList);
1658     const InlineBox* prev = 0;
1659     for (const InlineBox* child = m_firstChild; child; child = child->nextOnLine()) {
1660         ASSERT(child->parent() == this);
1661         ASSERT(child->prevOnLine() == prev);
1662         prev = child;
1663     }
1664     ASSERT(prev == m_lastChild);
1665 #endif
1666 }
1667
1668 #endif
1669
1670 } // namespace WebCore