1 /* 2 * Copyright (C) 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "config.h" 30 #include "core/rendering/RenderLineBoxList.h" 31 32 #include "core/rendering/HitTestResult.h" 33 #include "core/rendering/InlineTextBox.h" 34 #include "core/rendering/PaintInfo.h" 35 #include "core/rendering/RenderInline.h" 36 #include "core/rendering/RenderView.h" 37 #include "core/rendering/RootInlineBox.h" 38 39 using namespace std; 40 41 namespace WebCore { 42 43 #ifndef NDEBUG 44 RenderLineBoxList::~RenderLineBoxList() 45 { 46 ASSERT(!m_firstLineBox); 47 ASSERT(!m_lastLineBox); 48 } 49 #endif 50 51 void RenderLineBoxList::appendLineBox(InlineFlowBox* box) 52 { 53 checkConsistency(); 54 55 if (!m_firstLineBox) 56 m_firstLineBox = m_lastLineBox = box; 57 else { 58 m_lastLineBox->setNextLineBox(box); 59 box->setPreviousLineBox(m_lastLineBox); 60 m_lastLineBox = box; 61 } 62 63 checkConsistency(); 64 } 65 66 void RenderLineBoxList::deleteLineBoxTree() 67 { 68 InlineFlowBox* line = m_firstLineBox; 69 InlineFlowBox* nextLine; 70 while (line) { 71 nextLine = line->nextLineBox(); 72 line->deleteLine(); 73 line = nextLine; 74 } 75 m_firstLineBox = m_lastLineBox = 0; 76 } 77 78 void RenderLineBoxList::extractLineBox(InlineFlowBox* box) 79 { 80 checkConsistency(); 81 82 m_lastLineBox = box->prevLineBox(); 83 if (box == m_firstLineBox) 84 m_firstLineBox = 0; 85 if (box->prevLineBox()) 86 box->prevLineBox()->setNextLineBox(0); 87 box->setPreviousLineBox(0); 88 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) 89 curr->setExtracted(); 90 91 checkConsistency(); 92 } 93 94 void RenderLineBoxList::attachLineBox(InlineFlowBox* box) 95 { 96 checkConsistency(); 97 98 if (m_lastLineBox) { 99 m_lastLineBox->setNextLineBox(box); 100 box->setPreviousLineBox(m_lastLineBox); 101 } else 102 m_firstLineBox = box; 103 InlineFlowBox* last = box; 104 for (InlineFlowBox* curr = box; curr; curr = curr->nextLineBox()) { 105 curr->setExtracted(false); 106 last = curr; 107 } 108 m_lastLineBox = last; 109 110 checkConsistency(); 111 } 112 113 void RenderLineBoxList::removeLineBox(InlineFlowBox* box) 114 { 115 checkConsistency(); 116 117 if (box == m_firstLineBox) 118 m_firstLineBox = box->nextLineBox(); 119 if (box == m_lastLineBox) 120 m_lastLineBox = box->prevLineBox(); 121 if (box->nextLineBox()) 122 box->nextLineBox()->setPreviousLineBox(box->prevLineBox()); 123 if (box->prevLineBox()) 124 box->prevLineBox()->setNextLineBox(box->nextLineBox()); 125 126 checkConsistency(); 127 } 128 129 void RenderLineBoxList::deleteLineBoxes() 130 { 131 if (m_firstLineBox) { 132 InlineFlowBox* next; 133 for (InlineFlowBox* curr = m_firstLineBox; curr; curr = next) { 134 next = curr->nextLineBox(); 135 curr->destroy(); 136 } 137 m_firstLineBox = 0; 138 m_lastLineBox = 0; 139 } 140 } 141 142 void RenderLineBoxList::dirtyLineBoxes() 143 { 144 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) 145 curr->dirtyLineBoxes(); 146 } 147 148 bool RenderLineBoxList::rangeIntersectsRect(RenderBoxModelObject* renderer, LayoutUnit logicalTop, LayoutUnit logicalBottom, const LayoutRect& rect, const LayoutPoint& offset) const 149 { 150 RenderBox* block; 151 if (renderer->isBox()) 152 block = toRenderBox(renderer); 153 else 154 block = renderer->containingBlock(); 155 LayoutUnit physicalStart = block->flipForWritingMode(logicalTop); 156 LayoutUnit physicalEnd = block->flipForWritingMode(logicalBottom); 157 LayoutUnit physicalExtent = absoluteValue(physicalEnd - physicalStart); 158 physicalStart = min(physicalStart, physicalEnd); 159 160 if (renderer->style()->isHorizontalWritingMode()) { 161 physicalStart += offset.y(); 162 if (physicalStart >= rect.maxY() || physicalStart + physicalExtent <= rect.y()) 163 return false; 164 } else { 165 physicalStart += offset.x(); 166 if (physicalStart >= rect.maxX() || physicalStart + physicalExtent <= rect.x()) 167 return false; 168 } 169 170 return true; 171 } 172 173 bool RenderLineBoxList::anyLineIntersectsRect(RenderBoxModelObject* renderer, const LayoutRect& rect, const LayoutPoint& offset, LayoutUnit outlineSize) const 174 { 175 // We can check the first box and last box and avoid painting/hit testing if we don't 176 // intersect. This is a quick short-circuit that we can take to avoid walking any lines. 177 // FIXME: This check is flawed in the following extremely obscure way: 178 // if some line in the middle has a huge overflow, it might actually extend below the last line. 179 RootInlineBox* firstRootBox = firstLineBox()->root(); 180 RootInlineBox* lastRootBox = lastLineBox()->root(); 181 LayoutUnit firstLineTop = firstLineBox()->logicalTopVisualOverflow(firstRootBox->lineTop()); 182 LayoutUnit lastLineBottom = lastLineBox()->logicalBottomVisualOverflow(lastRootBox->lineBottom()); 183 LayoutUnit logicalTop = firstLineTop - outlineSize; 184 LayoutUnit logicalBottom = outlineSize + lastLineBottom; 185 186 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, rect, offset); 187 } 188 189 bool RenderLineBoxList::lineIntersectsDirtyRect(RenderBoxModelObject* renderer, InlineFlowBox* box, const PaintInfo& paintInfo, const LayoutPoint& offset) const 190 { 191 RootInlineBox* root = box->root(); 192 LayoutUnit logicalTop = min<LayoutUnit>(box->logicalTopVisualOverflow(root->lineTop()), root->selectionTop()) - renderer->maximalOutlineSize(paintInfo.phase); 193 LayoutUnit logicalBottom = box->logicalBottomVisualOverflow(root->lineBottom()) + renderer->maximalOutlineSize(paintInfo.phase); 194 195 return rangeIntersectsRect(renderer, logicalTop, logicalBottom, paintInfo.rect, offset); 196 } 197 198 void RenderLineBoxList::paint(RenderBoxModelObject* renderer, PaintInfo& paintInfo, const LayoutPoint& paintOffset) const 199 { 200 // Only paint during the foreground/selection phases. 201 if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseOutline 202 && paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines && paintInfo.phase != PaintPhaseTextClip 203 && paintInfo.phase != PaintPhaseMask) 204 return; 205 206 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could paint like this is if it has a layer. 207 208 // If we have no lines then we have no work to do. 209 if (!firstLineBox()) 210 return; 211 212 LayoutUnit outlineSize = renderer->maximalOutlineSize(paintInfo.phase); 213 if (!anyLineIntersectsRect(renderer, paintInfo.rect, paintOffset, outlineSize)) 214 return; 215 216 PaintInfo info(paintInfo); 217 ListHashSet<RenderInline*> outlineObjects; 218 info.setOutlineObjects(&outlineObjects); 219 220 // See if our root lines intersect with the dirty rect. If so, then we paint 221 // them. Note that boxes can easily overlap, so we can't make any assumptions 222 // based off positions of our first line box or our last line box. 223 for (InlineFlowBox* curr = firstLineBox(); curr; curr = curr->nextLineBox()) { 224 if (lineIntersectsDirtyRect(renderer, curr, info, paintOffset)) { 225 RootInlineBox* root = curr->root(); 226 curr->paint(info, paintOffset, root->lineTop(), root->lineBottom()); 227 } 228 } 229 230 if (info.phase == PaintPhaseOutline || info.phase == PaintPhaseSelfOutline || info.phase == PaintPhaseChildOutlines) { 231 ListHashSet<RenderInline*>::iterator end = info.outlineObjects()->end(); 232 for (ListHashSet<RenderInline*>::iterator it = info.outlineObjects()->begin(); it != end; ++it) { 233 RenderInline* flow = *it; 234 flow->paintOutline(info, paintOffset); 235 } 236 info.outlineObjects()->clear(); 237 } 238 } 239 240 bool RenderLineBoxList::hitTest(RenderBoxModelObject* renderer, const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction hitTestAction) const 241 { 242 if (hitTestAction != HitTestForeground) 243 return false; 244 245 ASSERT(renderer->isRenderBlock() || (renderer->isRenderInline() && renderer->hasLayer())); // The only way an inline could hit test like this is if it has a layer. 246 247 // If we have no lines then we have no work to do. 248 if (!firstLineBox()) 249 return false; 250 251 LayoutPoint point = locationInContainer.point(); 252 LayoutRect rect = firstLineBox()->isHorizontal() ? 253 IntRect(point.x(), point.y() - locationInContainer.topPadding(), 1, locationInContainer.topPadding() + locationInContainer.bottomPadding() + 1) : 254 IntRect(point.x() - locationInContainer.leftPadding(), point.y(), locationInContainer.rightPadding() + locationInContainer.leftPadding() + 1, 1); 255 256 if (!anyLineIntersectsRect(renderer, rect, accumulatedOffset)) 257 return false; 258 259 // See if our root lines contain the point. If so, then we hit test 260 // them further. Note that boxes can easily overlap, so we can't make any assumptions 261 // based off positions of our first line box or our last line box. 262 for (InlineFlowBox* curr = lastLineBox(); curr; curr = curr->prevLineBox()) { 263 RootInlineBox* root = curr->root(); 264 if (rangeIntersectsRect(renderer, curr->logicalTopVisualOverflow(root->lineTop()), curr->logicalBottomVisualOverflow(root->lineBottom()), rect, accumulatedOffset)) { 265 bool inside = curr->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, root->lineTop(), root->lineBottom()); 266 if (inside) { 267 renderer->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset)); 268 return true; 269 } 270 } 271 } 272 273 return false; 274 } 275 276 void RenderLineBoxList::dirtyLinesFromChangedChild(RenderObject* container, RenderObject* child) 277 { 278 if (!container->parent() || (container->isRenderBlock() && (container->selfNeedsLayout() || !container->isRenderBlockFlow()))) 279 return; 280 281 RenderInline* inlineContainer = container->isRenderInline() ? toRenderInline(container) : 0; 282 InlineBox* firstBox = inlineContainer ? inlineContainer->firstLineBoxIncludingCulling() : firstLineBox(); 283 284 // If we have no first line box, then just bail early. 285 if (!firstBox) { 286 // For an empty inline, go ahead and propagate the check up to our parent, unless the parent 287 // is already dirty. 288 if (container->isInline() && !container->ancestorLineBoxDirty()) { 289 container->parent()->dirtyLinesFromChangedChild(container); 290 container->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 291 } 292 return; 293 } 294 295 // Try to figure out which line box we belong in. First try to find a previous 296 // line box by examining our siblings. If we didn't find a line box, then use our 297 // parent's first line box. 298 RootInlineBox* box = 0; 299 RenderObject* curr = 0; 300 for (curr = child->previousSibling(); curr; curr = curr->previousSibling()) { 301 if (curr->isFloatingOrOutOfFlowPositioned()) 302 continue; 303 304 if (curr->isReplaced()) { 305 InlineBox* wrapper = toRenderBox(curr)->inlineBoxWrapper(); 306 if (wrapper) 307 box = wrapper->root(); 308 } else if (curr->isText()) { 309 InlineTextBox* textBox = toRenderText(curr)->lastTextBox(); 310 if (textBox) 311 box = textBox->root(); 312 } else if (curr->isRenderInline()) { 313 InlineBox* lastSiblingBox = toRenderInline(curr)->lastLineBoxIncludingCulling(); 314 if (lastSiblingBox) 315 box = lastSiblingBox->root(); 316 } 317 318 if (box) 319 break; 320 } 321 if (!box) { 322 if (inlineContainer && !inlineContainer->alwaysCreateLineBoxes()) { 323 // https://bugs.webkit.org/show_bug.cgi?id=60778 324 // We may have just removed a <br> with no line box that was our first child. In this case 325 // we won't find a previous sibling, but firstBox can be pointing to a following sibling. 326 // This isn't good enough, since we won't locate the root line box that encloses the removed 327 // <br>. We have to just over-invalidate a bit and go up to our parent. 328 if (!inlineContainer->ancestorLineBoxDirty()) { 329 inlineContainer->parent()->dirtyLinesFromChangedChild(inlineContainer); 330 inlineContainer->setAncestorLineBoxDirty(); // Mark the container to avoid dirtying the same lines again across multiple destroy() calls of the same subtree. 331 } 332 return; 333 } 334 box = firstBox->root(); 335 } 336 337 // If we found a line box, then dirty it. 338 if (box) { 339 RootInlineBox* adjacentBox; 340 box->markDirty(); 341 342 // dirty the adjacent lines that might be affected 343 // NOTE: we dirty the previous line because RootInlineBox objects cache 344 // the address of the first object on the next line after a BR, which we may be 345 // invalidating here. For more info, see how RenderBlock::layoutInlineChildren 346 // calls setLineBreakInfo with the result of findNextLineBreak. findNextLineBreak, 347 // despite the name, actually returns the first RenderObject after the BR. 348 // <rdar://problem/3849947> "Typing after pasting line does not appear until after window resize." 349 adjacentBox = box->prevRootBox(); 350 if (adjacentBox) 351 adjacentBox->markDirty(); 352 adjacentBox = box->nextRootBox(); 353 // If |child| has been inserted before the first element in the linebox, but after collapsed leading 354 // space, the search for |child|'s linebox will go past the leading space to the previous linebox and select that 355 // one as |box|. If we hit that situation here, dirty the |box| actually containing the child too. 356 bool insertedAfterLeadingSpace = box->lineBreakObj() == child->previousSibling(); 357 if (adjacentBox && (adjacentBox->lineBreakObj() == child || child->isBR() || (curr && curr->isBR()) 358 || insertedAfterLeadingSpace || isIsolated(container->style()->unicodeBidi()))) { 359 adjacentBox->markDirty(); 360 } 361 } 362 } 363 364 #ifndef NDEBUG 365 366 void RenderLineBoxList::checkConsistency() const 367 { 368 #ifdef CHECK_CONSISTENCY 369 const InlineFlowBox* prev = 0; 370 for (const InlineFlowBox* child = m_firstLineBox; child != 0; child = child->nextLineBox()) { 371 ASSERT(child->prevLineBox() == prev); 372 prev = child; 373 } 374 ASSERT(prev == m_lastLineBox); 375 #endif 376 } 377 378 #endif 379 380 } 381
