1/*
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 * (C) 2000 Antti Koivisto (koivisto@kde.org)
4 * (C) 2000 Dirk Mueller (mueller@kde.org)
5 * (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
6 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
7 * Copyright (C) 2009 Google Inc. All rights reserved.
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
18 *
19 * You should have received a copy of the GNU Library General Public License
20 * along with this library; see the file COPYING.LIB. If not, write to
21 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
23 *
24 */
25
26#pragma once
27
28#include "CachedImageClient.h"
29#include "Element.h"
30#include "FloatQuad.h"
31#include "Frame.h"
32#include "LayoutRect.h"
33#include "Page.h"
34#include "RenderObjectEnums.h"
35#include "RenderStyle.h"
36#include "ScrollAlignment.h"
37#include "StyleImage.h"
38#include "TextAffinity.h"
39#include <wtf/IsoMalloc.h>
40#include <wtf/WeakPtr.h>
41
42namespace WebCore {
43
44class AffineTransform;
45class CSSAnimationController;
46class Color;
47class Cursor;
48class Document;
49class DocumentTimeline;
50class HitTestLocation;
51class HitTestRequest;
52class HitTestResult;
53class InlineBox;
54class Path;
55class Position;
56class PseudoStyleRequest;
57class RenderBoxModelObject;
58class RenderInline;
59class RenderBlock;
60class RenderElement;
61class RenderFragmentedFlow;
62class RenderGeometryMap;
63class RenderLayer;
64class RenderLayerModelObject;
65class RenderFragmentContainer;
66class RenderTheme;
67class RenderTreeBuilder;
68class SelectionRangeData;
69class TransformState;
70class VisiblePosition;
71
72#if PLATFORM(IOS_FAMILY)
73class SelectionRect;
74#endif
75
76struct PaintInfo;
77
78#if PLATFORM(IOS_FAMILY)
79const int caretWidth = 2; // This value should be kept in sync with UIKit. See <rdar://problem/15580601>.
80#else
81const int caretWidth = 1;
82#endif
83
84enum class ShouldAllowCrossOriginScrolling { No, Yes };
85
86struct ScrollRectToVisibleOptions;
87
88#if ENABLE(DASHBOARD_SUPPORT)
89struct AnnotatedRegionValue {
90 bool operator==(const AnnotatedRegionValue& o) const
91 {
92 return type == o.type && bounds == o.bounds && clip == o.clip && label == o.label;
93 }
94 bool operator!=(const AnnotatedRegionValue& o) const
95 {
96 return !(*this == o);
97 }
98
99 LayoutRect bounds;
100 String label;
101 LayoutRect clip;
102 int type;
103};
104#endif
105
106// Base class for all rendering tree objects.
107class RenderObject : public CachedImageClient, public CanMakeWeakPtr<RenderObject> {
108 WTF_MAKE_ISO_ALLOCATED(RenderObject);
109 friend class RenderBlock;
110 friend class RenderBlockFlow;
111 friend class RenderElement;
112 friend class RenderLayer;
113public:
114 // Anonymous objects should pass the document as their node, and they will then automatically be
115 // marked as anonymous in the constructor.
116 explicit RenderObject(Node&);
117 virtual ~RenderObject();
118
119 RenderTheme& theme() const;
120
121 virtual const char* renderName() const = 0;
122
123 RenderElement* parent() const { return m_parent; }
124 bool isDescendantOf(const RenderObject*) const;
125
126 RenderObject* previousSibling() const { return m_previous; }
127 RenderObject* nextSibling() const { return m_next; }
128
129 // Use RenderElement versions instead.
130 virtual RenderObject* firstChildSlow() const { return nullptr; }
131 virtual RenderObject* lastChildSlow() const { return nullptr; }
132
133 RenderObject* nextInPreOrder() const;
134 RenderObject* nextInPreOrder(const RenderObject* stayWithin) const;
135 RenderObject* nextInPreOrderAfterChildren() const;
136 RenderObject* nextInPreOrderAfterChildren(const RenderObject* stayWithin) const;
137 RenderObject* previousInPreOrder() const;
138 RenderObject* previousInPreOrder(const RenderObject* stayWithin) const;
139 WEBCORE_EXPORT RenderObject* childAt(unsigned) const;
140
141 RenderObject* firstLeafChild() const;
142 RenderObject* lastLeafChild() const;
143
144#if ENABLE(TEXT_AUTOSIZING)
145 // Minimal distance between the block with fixed height and overflowing content and the text block to apply text autosizing.
146 // The greater this constant is the more potential places we have where autosizing is turned off.
147 // So it should be as low as possible. There are sites that break at 2.
148 static const int TextAutoSizingFixedHeightDepth = 3;
149
150 enum BlockContentHeightType {
151 FixedHeight,
152 FlexibleHeight,
153 OverflowHeight
154 };
155
156 typedef BlockContentHeightType (*HeightTypeTraverseNextInclusionFunction)(const RenderObject&);
157 RenderObject* traverseNext(const RenderObject* stayWithin, HeightTypeTraverseNextInclusionFunction, int& currentDepth, int& newFixedDepth) const;
158#endif
159
160 WEBCORE_EXPORT RenderLayer* enclosingLayer() const;
161
162 // Scrolling is a RenderBox concept, however some code just cares about recursively scrolling our enclosing ScrollableArea(s).
163 WEBCORE_EXPORT bool scrollRectToVisible(const LayoutRect& absoluteRect, bool insideFixed, const ScrollRectToVisibleOptions&);
164
165 // Convenience function for getting to the nearest enclosing box of a RenderObject.
166 WEBCORE_EXPORT RenderBox& enclosingBox() const;
167 RenderBoxModelObject& enclosingBoxModelObject() const;
168 const RenderBox* enclosingScrollableContainerForSnapping() const;
169
170 // Function to return our enclosing flow thread if we are contained inside one. This
171 // function follows the containing block chain.
172 RenderFragmentedFlow* enclosingFragmentedFlow() const
173 {
174 if (fragmentedFlowState() == NotInsideFragmentedFlow)
175 return nullptr;
176
177 return locateEnclosingFragmentedFlow();
178 }
179
180 WEBCORE_EXPORT bool useDarkAppearance() const;
181 OptionSet<StyleColor::Options> styleColorOptions() const;
182
183#ifndef NDEBUG
184 void setHasAXObject(bool flag) { m_hasAXObject = flag; }
185 bool hasAXObject() const { return m_hasAXObject; }
186
187 // Helper class forbidding calls to setNeedsLayout() during its lifetime.
188 class SetLayoutNeededForbiddenScope {
189 public:
190 explicit SetLayoutNeededForbiddenScope(RenderObject*, bool isForbidden = true);
191 ~SetLayoutNeededForbiddenScope();
192 private:
193 RenderObject* m_renderObject;
194 bool m_preexistingForbidden;
195 };
196#endif
197
198 // Obtains the nearest enclosing block (including this block) that contributes a first-line style to our inline
199 // children.
200 virtual RenderBlock* firstLineBlock() const;
201
202 // RenderObject tree manipulation
203 //////////////////////////////////////////
204 virtual bool canHaveChildren() const = 0;
205 virtual bool canHaveGeneratedChildren() const;
206 virtual bool createsAnonymousWrapper() const { return false; }
207 //////////////////////////////////////////
208
209#if ENABLE(TREE_DEBUGGING)
210 void showNodeTreeForThis() const;
211 void showRenderTreeForThis() const;
212 void showLineTreeForThis() const;
213
214 void outputRenderObject(WTF::TextStream&, bool mark, int depth) const;
215 void outputRenderSubTreeAndMark(WTF::TextStream&, const RenderObject* markedObject, int depth) const;
216 void outputRegionsInformation(WTF::TextStream&) const;
217#endif
218
219 bool isPseudoElement() const { return node() && node()->isPseudoElement(); }
220
221 bool isRenderElement() const { return !isText(); }
222 bool isRenderReplaced() const;
223 bool isBoxModelObject() const;
224 bool isRenderBlock() const;
225 bool isRenderBlockFlow() const;
226 bool isRenderInline() const;
227 bool isRenderLayerModelObject() const;
228
229 virtual bool isCounter() const { return false; }
230 virtual bool isQuote() const { return false; }
231
232 virtual bool isDetailsMarker() const { return false; }
233 virtual bool isEmbeddedObject() const { return false; }
234 bool isFieldset() const;
235 virtual bool isFileUploadControl() const { return false; }
236 virtual bool isFrame() const { return false; }
237 virtual bool isFrameSet() const { return false; }
238 virtual bool isImage() const { return false; }
239 virtual bool isInlineBlockOrInlineTable() const { return false; }
240 virtual bool isListBox() const { return false; }
241 virtual bool isListItem() const { return false; }
242 virtual bool isListMarker() const { return false; }
243 virtual bool isMedia() const { return false; }
244 virtual bool isMenuList() const { return false; }
245#if ENABLE(METER_ELEMENT)
246 virtual bool isMeter() const { return false; }
247#endif
248 virtual bool isSnapshottedPlugIn() const { return false; }
249 virtual bool isProgress() const { return false; }
250 virtual bool isRenderButton() const { return false; }
251 virtual bool isRenderIFrame() const { return false; }
252 virtual bool isRenderImage() const { return false; }
253 virtual bool isRenderFragmentContainer() const { return false; }
254 virtual bool isReplica() const { return false; }
255
256 virtual bool isRubyInline() const { return false; }
257 virtual bool isRubyBlock() const { return false; }
258 virtual bool isRubyBase() const { return false; }
259 virtual bool isRubyRun() const { return false; }
260 virtual bool isRubyText() const { return false; }
261
262 virtual bool isSlider() const { return false; }
263 virtual bool isSliderThumb() const { return false; }
264 virtual bool isTable() const { return false; }
265 virtual bool isTableCell() const { return false; }
266 virtual bool isRenderTableCol() const { return false; }
267 virtual bool isTableCaption() const { return false; }
268 virtual bool isTableRow() const { return false; }
269 virtual bool isTableSection() const { return false; }
270 virtual bool isTextControl() const { return false; }
271 virtual bool isTextArea() const { return false; }
272 virtual bool isTextField() const { return false; }
273 virtual bool isSearchField() const { return false; }
274 virtual bool isTextControlInnerBlock() const { return false; }
275 virtual bool isVideo() const { return false; }
276 virtual bool isWidget() const { return false; }
277 virtual bool isCanvas() const { return false; }
278#if ENABLE(ATTACHMENT_ELEMENT)
279 virtual bool isAttachment() const { return false; }
280#endif
281#if ENABLE(FULLSCREEN_API)
282 virtual bool isRenderFullScreen() const { return false; }
283 virtual bool isRenderFullScreenPlaceholder() const { return false; }
284#endif
285 virtual bool isRenderGrid() const { return false; }
286 bool isInFlowRenderFragmentedFlow() const { return isRenderFragmentedFlow() && !isOutOfFlowPositioned(); }
287 bool isOutOfFlowRenderFragmentedFlow() const { return isRenderFragmentedFlow() && isOutOfFlowPositioned(); }
288
289 virtual bool isMultiColumnBlockFlow() const { return false; }
290 virtual bool isRenderMultiColumnSet() const { return false; }
291 virtual bool isRenderMultiColumnFlow() const { return false; }
292 virtual bool isRenderMultiColumnSpannerPlaceholder() const { return false; }
293
294 virtual bool isRenderScrollbarPart() const { return false; }
295
296 bool isDocumentElementRenderer() const { return document().documentElement() == &m_node; }
297 bool isBody() const { return node() && node()->hasTagName(HTMLNames::bodyTag); }
298 bool isHR() const { return node() && node()->hasTagName(HTMLNames::hrTag); }
299 bool isLegend() const;
300
301 bool isHTMLMarquee() const;
302
303 bool isTablePart() const { return isTableCell() || isRenderTableCol() || isTableCaption() || isTableRow() || isTableSection(); }
304
305 inline bool isBeforeContent() const;
306 inline bool isAfterContent() const;
307 inline bool isBeforeOrAfterContent() const;
308 static inline bool isBeforeContent(const RenderObject* obj) { return obj && obj->isBeforeContent(); }
309 static inline bool isAfterContent(const RenderObject* obj) { return obj && obj->isAfterContent(); }
310 static inline bool isBeforeOrAfterContent(const RenderObject* obj) { return obj && obj->isBeforeOrAfterContent(); }
311
312 bool beingDestroyed() const { return m_bitfields.beingDestroyed(); }
313
314 bool everHadLayout() const { return m_bitfields.everHadLayout(); }
315
316 bool childrenInline() const { return m_bitfields.childrenInline(); }
317 void setChildrenInline(bool b) { m_bitfields.setChildrenInline(b); }
318
319 enum FragmentedFlowState {
320 NotInsideFragmentedFlow = 0,
321 InsideInFragmentedFlow = 1,
322 };
323
324 void setFragmentedFlowStateIncludingDescendants(FragmentedFlowState);
325
326 FragmentedFlowState fragmentedFlowState() const { return m_bitfields.fragmentedFlowState(); }
327 void setFragmentedFlowState(FragmentedFlowState state) { m_bitfields.setFragmentedFlowState(state); }
328
329#if ENABLE(MATHML)
330 virtual bool isRenderMathMLBlock() const { return false; }
331 virtual bool isRenderMathMLTable() const { return false; }
332 virtual bool isRenderMathMLOperator() const { return false; }
333 virtual bool isRenderMathMLRow() const { return false; }
334 virtual bool isRenderMathMLMath() const { return false; }
335 virtual bool isRenderMathMLMenclose() const { return false; }
336 virtual bool isRenderMathMLFenced() const { return false; }
337 virtual bool isRenderMathMLFencedOperator() const { return false; }
338 virtual bool isRenderMathMLFraction() const { return false; }
339 virtual bool isRenderMathMLPadded() const { return false; }
340 virtual bool isRenderMathMLRoot() const { return false; }
341 virtual bool isRenderMathMLSpace() const { return false; }
342 virtual bool isRenderMathMLSquareRoot() const { return false; }
343 virtual bool isRenderMathMLScripts() const { return false; }
344 virtual bool isRenderMathMLToken() const { return false; }
345 virtual bool isRenderMathMLUnderOver() const { return false; }
346#endif // ENABLE(MATHML)
347
348 // FIXME: Until all SVG renders can be subclasses of RenderSVGModelObject we have
349 // to add SVG renderer methods to RenderObject with an ASSERT_NOT_REACHED() default implementation.
350 virtual bool isRenderSVGModelObject() const { return false; }
351 virtual bool isRenderSVGBlock() const { return false; };
352 virtual bool isSVGRoot() const { return false; }
353 virtual bool isSVGContainer() const { return false; }
354 virtual bool isSVGTransformableContainer() const { return false; }
355 virtual bool isSVGViewportContainer() const { return false; }
356 virtual bool isSVGGradientStop() const { return false; }
357 virtual bool isSVGHiddenContainer() const { return false; }
358 virtual bool isSVGPath() const { return false; }
359 virtual bool isSVGShape() const { return false; }
360 virtual bool isSVGText() const { return false; }
361 virtual bool isSVGTextPath() const { return false; }
362 virtual bool isSVGTSpan() const { return false; }
363 virtual bool isSVGInline() const { return false; }
364 virtual bool isSVGInlineText() const { return false; }
365 virtual bool isSVGImage() const { return false; }
366 virtual bool isSVGForeignObject() const { return false; }
367 virtual bool isSVGResourceContainer() const { return false; }
368 virtual bool isSVGResourceFilter() const { return false; }
369 virtual bool isSVGResourceClipper() const { return false; }
370 virtual bool isSVGResourceFilterPrimitive() const { return false; }
371
372 // FIXME: Those belong into a SVG specific base-class for all renderers (see above)
373 // Unfortunately we don't have such a class yet, because it's not possible for all renderers
374 // to inherit from RenderSVGObject -> RenderObject (some need RenderBlock inheritance for instance)
375 virtual void setNeedsTransformUpdate() { }
376 virtual void setNeedsBoundariesUpdate();
377 virtual bool needsBoundariesUpdate() { return false; }
378
379 // Per SVG 1.1 objectBoundingBox ignores clipping, masking, filter effects, opacity and stroke-width.
380 // This is used for all computation of objectBoundingBox relative units and by SVGLocatable::getBBox().
381 // NOTE: Markers are not specifically ignored here by SVG 1.1 spec, but we ignore them
382 // since stroke-width is ignored (and marker size can depend on stroke-width).
383 // objectBoundingBox is returned local coordinates.
384 // The name objectBoundingBox is taken from the SVG 1.1 spec.
385 virtual FloatRect objectBoundingBox() const;
386 virtual FloatRect strokeBoundingBox() const;
387
388 // Returns the smallest rectangle enclosing all of the painted content
389 // respecting clipping, masking, filters, opacity, stroke-width and markers
390 virtual FloatRect repaintRectInLocalCoordinates() const;
391
392 // This only returns the transform="" value from the element
393 // most callsites want localToParentTransform() instead.
394 virtual AffineTransform localTransform() const;
395
396 // Returns the full transform mapping from local coordinates to local coords for the parent SVG renderer
397 // This includes any viewport transforms and x/y offsets as well as the transform="" value off the element.
398 virtual const AffineTransform& localToParentTransform() const;
399
400 // SVG uses FloatPoint precise hit testing, and passes the point in parent
401 // coordinates instead of in repaint container coordinates. Eventually the
402 // rest of the rendering tree will move to a similar model.
403 virtual bool nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint& pointInParent, HitTestAction);
404
405 bool hasAspectRatio() const { return isReplaced() && (isImage() || isVideo() || isCanvas()); }
406 bool isAnonymous() const { return m_bitfields.isAnonymous(); }
407 bool isAnonymousBlock() const
408 {
409 // This function is kept in sync with anonymous block creation conditions in
410 // RenderBlock::createAnonymousBlock(). This includes creating an anonymous
411 // RenderBlock having a DisplayType::Block or DisplayType::Box display. Other classes such as RenderTextFragment
412 // are not RenderBlocks and will return false. See https://bugs.webkit.org/show_bug.cgi?id=56709.
413 return isAnonymous() && (style().display() == DisplayType::Block || style().display() == DisplayType::Box) && style().styleType() == PseudoId::None && isRenderBlock() && !isListMarker() && !isRenderFragmentedFlow() && !isRenderMultiColumnSet() && !isRenderView()
414#if ENABLE(FULLSCREEN_API)
415 && !isRenderFullScreen()
416 && !isRenderFullScreenPlaceholder()
417#endif
418#if ENABLE(MATHML)
419 && !isRenderMathMLBlock()
420#endif
421 ;
422 }
423
424 bool isFloating() const { return m_bitfields.floating(); }
425
426 bool isPositioned() const { return m_bitfields.isPositioned(); }
427 bool isInFlowPositioned() const { return m_bitfields.isRelativelyPositioned() || m_bitfields.isStickilyPositioned(); }
428 bool isOutOfFlowPositioned() const { return m_bitfields.isOutOfFlowPositioned(); } // absolute or fixed positioning
429 bool isFixedPositioned() const { return isOutOfFlowPositioned() && style().position() == PositionType::Fixed; }
430 bool isAbsolutelyPositioned() const { return isOutOfFlowPositioned() && style().position() == PositionType::Absolute; }
431 bool isRelativelyPositioned() const { return m_bitfields.isRelativelyPositioned(); }
432 bool isStickilyPositioned() const { return m_bitfields.isStickilyPositioned(); }
433
434 bool isText() const { return !m_bitfields.isBox() && m_bitfields.isTextOrRenderView(); }
435 bool isLineBreak() const { return m_bitfields.isLineBreak(); }
436 bool isBR() const { return isLineBreak() && !isWBR(); }
437 bool isLineBreakOpportunity() const { return isLineBreak() && isWBR(); }
438 bool isTextOrLineBreak() const { return isText() || isLineBreak(); }
439 bool isBox() const { return m_bitfields.isBox(); }
440 bool isRenderView() const { return m_bitfields.isBox() && m_bitfields.isTextOrRenderView(); }
441 bool isInline() const { return m_bitfields.isInline(); } // inline object
442 bool isReplaced() const { return m_bitfields.isReplaced(); } // a "replaced" element (see CSS)
443 bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); }
444
445 bool isDragging() const { return m_bitfields.hasRareData() && rareData().isDragging(); }
446 bool hasReflection() const { return m_bitfields.hasRareData() && rareData().hasReflection(); }
447 bool isRenderFragmentedFlow() const { return m_bitfields.hasRareData() && rareData().isRenderFragmentedFlow(); }
448 bool hasOutlineAutoAncestor() const { return m_bitfields.hasRareData() && rareData().hasOutlineAutoAncestor(); }
449
450 bool isExcludedFromNormalLayout() const { return m_bitfields.isExcludedFromNormalLayout(); }
451 void setIsExcludedFromNormalLayout(bool excluded) { m_bitfields.setIsExcludedFromNormalLayout(excluded); }
452 bool isExcludedAndPlacedInBorder() const { return isExcludedFromNormalLayout() && isLegend(); }
453
454 bool hasLayer() const { return m_bitfields.hasLayer(); }
455
456 enum BoxDecorationState {
457 NoBoxDecorations,
458 HasBoxDecorationsAndBackgroundObscurationStatusInvalid,
459 HasBoxDecorationsAndBackgroundIsKnownToBeObscured,
460 HasBoxDecorationsAndBackgroundMayBeVisible,
461 };
462 bool hasVisibleBoxDecorations() const { return m_bitfields.boxDecorationState() != NoBoxDecorations; }
463 bool backgroundIsKnownToBeObscured(const LayoutPoint& paintOffset);
464
465 bool needsLayout() const
466 {
467 return m_bitfields.needsLayout() || m_bitfields.normalChildNeedsLayout() || m_bitfields.posChildNeedsLayout()
468 || m_bitfields.needsSimplifiedNormalFlowLayout() || m_bitfields.needsPositionedMovementLayout();
469 }
470
471 bool selfNeedsLayout() const { return m_bitfields.needsLayout(); }
472 bool needsPositionedMovementLayout() const { return m_bitfields.needsPositionedMovementLayout(); }
473 bool needsPositionedMovementLayoutOnly() const
474 {
475 return m_bitfields.needsPositionedMovementLayout() && !m_bitfields.needsLayout() && !m_bitfields.normalChildNeedsLayout()
476 && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsSimplifiedNormalFlowLayout();
477 }
478
479 bool posChildNeedsLayout() const { return m_bitfields.posChildNeedsLayout(); }
480 bool needsSimplifiedNormalFlowLayout() const { return m_bitfields.needsSimplifiedNormalFlowLayout(); }
481 bool needsSimplifiedNormalFlowLayoutOnly() const;
482 bool normalChildNeedsLayout() const { return m_bitfields.normalChildNeedsLayout(); }
483
484 bool preferredLogicalWidthsDirty() const { return m_bitfields.preferredLogicalWidthsDirty(); }
485
486 bool isSelectionBorder() const;
487
488 bool hasOverflowClip() const { return m_bitfields.hasOverflowClip(); }
489
490 bool hasTransformRelatedProperty() const { return m_bitfields.hasTransformRelatedProperty(); } // Transform, perspective or transform-style: preserve-3d.
491 bool hasTransform() const { return hasTransformRelatedProperty() && style().hasTransform(); }
492
493 inline bool preservesNewline() const;
494
495 virtual void updateDragState(bool dragOn);
496
497 RenderView& view() const { return *document().renderView(); };
498
499 // Returns true if this renderer is rooted.
500 bool isRooted() const;
501
502 Node* node() const { return isAnonymous() ? nullptr : &m_node; }
503 Node* nonPseudoNode() const { return isPseudoElement() ? nullptr : node(); }
504
505 // Returns the styled node that caused the generation of this renderer.
506 // This is the same as node() except for renderers of :before and :after
507 // pseudo elements for which their parent node is returned.
508 Node* generatingNode() const { return isPseudoElement() ? generatingPseudoHostElement() : node(); }
509
510 Document& document() const { return m_node.document(); }
511 Frame& frame() const;
512 Page& page() const;
513 Settings& settings() const { return page().settings(); }
514
515 // Returns the object containing this one. Can be different from parent for positioned elements.
516 // If repaintContainer and repaintContainerSkipped are not null, on return *repaintContainerSkipped
517 // is true if the renderer returned is an ancestor of repaintContainer.
518 RenderElement* container() const;
519 RenderElement* container(const RenderLayerModelObject* repaintContainer, bool& repaintContainerSkipped) const;
520
521 RenderBoxModelObject* offsetParent() const;
522
523 void markContainingBlocksForLayout(ScheduleRelayout = ScheduleRelayout::Yes, RenderElement* newRoot = nullptr);
524 void setNeedsLayout(MarkingBehavior = MarkContainingBlockChain);
525 void clearNeedsLayout();
526 void setPreferredLogicalWidthsDirty(bool, MarkingBehavior = MarkContainingBlockChain);
527 void invalidateContainerPreferredLogicalWidths();
528
529 void setNeedsLayoutAndPrefWidthsRecalc()
530 {
531 setNeedsLayout();
532 setPreferredLogicalWidthsDirty(true);
533 }
534
535 void setPositionState(PositionType position)
536 {
537 ASSERT((position != PositionType::Absolute && position != PositionType::Fixed) || isBox());
538 m_bitfields.setPositionedState(static_cast<int>(position));
539 }
540 void clearPositionedState() { m_bitfields.clearPositionedState(); }
541
542 void setFloating(bool b = true) { m_bitfields.setFloating(b); }
543 void setInline(bool b = true) { m_bitfields.setIsInline(b); }
544
545 void setHasVisibleBoxDecorations(bool = true);
546 void invalidateBackgroundObscurationStatus();
547 virtual bool computeBackgroundIsKnownToBeObscured(const LayoutPoint&) { return false; }
548
549 void setIsText() { ASSERT(!isBox()); m_bitfields.setIsTextOrRenderView(true); }
550 void setIsLineBreak() { m_bitfields.setIsLineBreak(true); }
551 void setIsBox() { m_bitfields.setIsBox(true); }
552 void setIsRenderView() { ASSERT(isBox()); m_bitfields.setIsTextOrRenderView(true); }
553 void setReplaced(bool b = true) { m_bitfields.setIsReplaced(b); }
554 void setHorizontalWritingMode(bool b = true) { m_bitfields.setHorizontalWritingMode(b); }
555 void setHasOverflowClip(bool b = true) { m_bitfields.setHasOverflowClip(b); }
556 void setHasLayer(bool b = true) { m_bitfields.setHasLayer(b); }
557 void setHasTransformRelatedProperty(bool b = true) { m_bitfields.setHasTransformRelatedProperty(b); }
558
559 void setIsDragging(bool);
560 void setHasReflection(bool = true);
561 void setIsRenderFragmentedFlow(bool = true);
562 void setHasOutlineAutoAncestor(bool = true);
563
564 // Hook so that RenderTextControl can return the line height of its inner renderer.
565 // For other renderers, the value is the same as lineHeight(false).
566 virtual int innerLineHeight() const;
567
568 // used for element state updates that cannot be fixed with a
569 // repaint and do not need a relayout
570 virtual void updateFromElement() { }
571
572#if ENABLE(DASHBOARD_SUPPORT)
573 virtual void addAnnotatedRegions(Vector<AnnotatedRegionValue>&);
574 void collectAnnotatedRegions(Vector<AnnotatedRegionValue>&);
575#endif
576
577 bool isComposited() const;
578
579 bool hitTest(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestFilter = HitTestAll);
580 virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&);
581 virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
582
583 virtual Position positionForPoint(const LayoutPoint&);
584 virtual VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*);
585 VisiblePosition createVisiblePosition(int offset, EAffinity) const;
586 VisiblePosition createVisiblePosition(const Position&) const;
587
588 // returns the containing block level element for this element.
589 WEBCORE_EXPORT RenderBlock* containingBlock() const;
590 RenderBlock* containingBlockForObjectInFlow() const;
591
592 // Convert the given local point to absolute coordinates. If MapCoordinatesFlags includes UseTransforms, take transforms into account.
593 WEBCORE_EXPORT FloatPoint localToAbsolute(const FloatPoint& localPoint = FloatPoint(), MapCoordinatesFlags = 0, bool* wasFixed = nullptr) const;
594 FloatPoint absoluteToLocal(const FloatPoint&, MapCoordinatesFlags = 0) const;
595
596 // Convert a local quad to absolute coordinates, taking transforms into account.
597 FloatQuad localToAbsoluteQuad(const FloatQuad& quad, MapCoordinatesFlags mode = UseTransforms, bool* wasFixed = nullptr) const
598 {
599 return localToContainerQuad(quad, nullptr, mode, wasFixed);
600 }
601 // Convert an absolute quad to local coordinates.
602 FloatQuad absoluteToLocalQuad(const FloatQuad&, MapCoordinatesFlags mode = UseTransforms) const;
603
604 // Convert a local quad into the coordinate system of container, taking transforms into account.
605 WEBCORE_EXPORT FloatQuad localToContainerQuad(const FloatQuad&, const RenderLayerModelObject* repaintContainer, MapCoordinatesFlags = UseTransforms, bool* wasFixed = nullptr) const;
606 WEBCORE_EXPORT FloatPoint localToContainerPoint(const FloatPoint&, const RenderLayerModelObject* repaintContainer, MapCoordinatesFlags = UseTransforms, bool* wasFixed = nullptr) const;
607
608 // Return the offset from the container() renderer (excluding transforms). In multi-column layout,
609 // different offsets apply at different points, so return the offset that applies to the given point.
610 virtual LayoutSize offsetFromContainer(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const;
611 // Return the offset from an object up the container() chain. Asserts that none of the intermediate objects have transforms.
612 LayoutSize offsetFromAncestorContainer(RenderElement&) const;
613
614#if PLATFORM(IOS_FAMILY)
615 virtual void collectSelectionRects(Vector<SelectionRect>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max());
616 virtual void absoluteQuadsForSelection(Vector<FloatQuad>& quads) const { absoluteQuads(quads); }
617#endif
618
619 virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint&) const { }
620
621 // FIXME: useTransforms should go away eventually
622 WEBCORE_EXPORT IntRect absoluteBoundingBoxRect(bool useTransform = true, bool* wasFixed = nullptr) const;
623 IntRect absoluteBoundingBoxRectIgnoringTransforms() const { return absoluteBoundingBoxRect(false); }
624
625 // Build an array of quads in absolute coords for line boxes
626 virtual void absoluteQuads(Vector<FloatQuad>&, bool* /*wasFixed*/ = nullptr) const { }
627
628 virtual void absoluteFocusRingQuads(Vector<FloatQuad>&);
629
630 static FloatRect absoluteBoundingBoxRectForRange(const Range*);
631
632 // the rect that will be painted if this object is passed as the paintingRoot
633 WEBCORE_EXPORT LayoutRect paintingRootRect(LayoutRect& topLevelRect);
634
635 virtual LayoutUnit minPreferredLogicalWidth() const { return 0; }
636 virtual LayoutUnit maxPreferredLogicalWidth() const { return 0; }
637
638 const RenderStyle& style() const;
639 const RenderStyle& firstLineStyle() const;
640
641 // Anonymous blocks that are part of of a continuation chain will return their inline continuation's outline style instead.
642 // This is typically only relevant when repainting.
643 virtual const RenderStyle& outlineStyleForRepaint() const { return style(); }
644
645 virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
646
647 // Return the RenderLayerModelObject in the container chain which is responsible for painting this object, or nullptr
648 // if painting is root-relative. This is the container that should be passed to the 'forRepaint'
649 // methods.
650 RenderLayerModelObject* containerForRepaint() const;
651 // Actually do the repaint of rect r for this object which has been computed in the coordinate space
652 // of repaintContainer. If repaintContainer is nullptr, repaint via the view.
653 void repaintUsingContainer(const RenderLayerModelObject* repaintContainer, const LayoutRect&, bool shouldClipToLayer = true) const;
654
655 // Repaint the entire object. Called when, e.g., the color of a border changes, or when a border
656 // style changes.
657 void repaint() const;
658
659 // Repaint a specific subrectangle within a given object. The rect |r| is in the object's coordinate space.
660 WEBCORE_EXPORT void repaintRectangle(const LayoutRect&, bool shouldClipToLayer = true) const;
661
662 // Repaint a slow repaint object, which, at this time, means we are repainting an object with background-attachment:fixed.
663 void repaintSlowRepaintObject() const;
664
665 // Returns the rect that should be repainted whenever this object changes. The rect is in the view's
666 // coordinate space. This method deals with outlines and overflow.
667 LayoutRect absoluteClippedOverflowRect() const
668 {
669 return clippedOverflowRectForRepaint(nullptr);
670 }
671 WEBCORE_EXPORT IntRect pixelSnappedAbsoluteClippedOverflowRect() const;
672 virtual LayoutRect clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const;
673 virtual LayoutRect rectWithOutlineForRepaint(const RenderLayerModelObject* repaintContainer, LayoutUnit outlineWidth) const;
674 virtual LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* /*repaintContainer*/, const RenderGeometryMap* = nullptr) const { return LayoutRect(); }
675
676 // Given a rect in the object's coordinate space, compute a rect suitable for repainting
677 // that rect in view coordinates.
678 LayoutRect computeAbsoluteRepaintRect(const LayoutRect& r) const
679 {
680 return computeRectForRepaint(r, nullptr);
681 }
682 // Given a rect in the object's coordinate space, compute a rect suitable for repainting
683 // that rect in the coordinate space of repaintContainer.
684 LayoutRect computeRectForRepaint(const LayoutRect&, const RenderLayerModelObject* repaintContainer) const;
685 FloatRect computeFloatRectForRepaint(const FloatRect&, const RenderLayerModelObject* repaintContainer) const;
686
687 // Given a rect in the object's coordinate space, compute the location in container space where this rect is visible,
688 // when clipping and scrolling as specified by the context. When using edge-inclusive intersection, return WTF::nullopt
689 // rather than an empty rect if the rect is completely clipped out in container space.
690 enum class VisibleRectContextOption {
691 UseEdgeInclusiveIntersection = 1 << 0,
692 ApplyCompositedClips = 1 << 1,
693 ApplyCompositedContainerScrolls = 1 << 2,
694 };
695 struct VisibleRectContext {
696 VisibleRectContext(bool hasPositionFixedDescendant = false, bool dirtyRectIsFlipped = false, OptionSet<VisibleRectContextOption> options = { })
697 : m_hasPositionFixedDescendant(hasPositionFixedDescendant)
698 , m_dirtyRectIsFlipped(dirtyRectIsFlipped)
699 , m_options(options)
700 {
701 }
702 bool m_hasPositionFixedDescendant;
703 bool m_dirtyRectIsFlipped;
704 OptionSet<VisibleRectContextOption> m_options;
705 };
706 virtual Optional<LayoutRect> computeVisibleRectInContainer(const LayoutRect&, const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;
707 virtual Optional<FloatRect> computeFloatVisibleRectInContainer(const FloatRect&, const RenderLayerModelObject* repaintContainer, VisibleRectContext) const;
708
709 virtual unsigned int length() const { return 1; }
710
711 bool isFloatingOrOutOfFlowPositioned() const { return (isFloating() || isOutOfFlowPositioned()); }
712
713 enum SelectionState {
714 SelectionNone, // The object is not selected.
715 SelectionStart, // The object either contains the start of a selection run or is the start of a run
716 SelectionInside, // The object is fully encompassed by a selection run
717 SelectionEnd, // The object either contains the end of a selection run or is the end of a run
718 SelectionBoth // The object contains an entire run or is the sole selected object in that run
719 };
720
721 // The current selection state for an object. For blocks, the state refers to the state of the leaf
722 // descendants (as described above in the SelectionState enum declaration).
723 SelectionState selectionState() const { return m_bitfields.selectionState(); }
724 virtual void setSelectionState(SelectionState state) { m_bitfields.setSelectionState(state); }
725 inline void setSelectionStateIfNeeded(SelectionState);
726 bool canUpdateSelectionOnRootLineBoxes();
727
728 // A single rectangle that encompasses all of the selected objects within this object. Used to determine the tightest
729 // possible bounding box for the selection.
730 LayoutRect selectionRect(bool clipToVisibleContent = true) { return selectionRectForRepaint(nullptr, clipToVisibleContent); }
731 virtual LayoutRect selectionRectForRepaint(const RenderLayerModelObject* /*repaintContainer*/, bool /*clipToVisibleContent*/ = true) { return LayoutRect(); }
732
733 virtual bool canBeSelectionLeaf() const { return false; }
734
735 // Whether or not a given block needs to paint selection gaps.
736 virtual bool shouldPaintSelectionGaps() const { return false; }
737
738 /**
739 * Returns the local coordinates of the caret within this render object.
740 * @param caretOffset zero-based offset determining position within the render object.
741 * @param extraWidthToEndOfLine optional out arg to give extra width to end of line -
742 * useful for character range rect computations
743 */
744 virtual LayoutRect localCaretRect(InlineBox*, unsigned caretOffset, LayoutUnit* extraWidthToEndOfLine = nullptr);
745
746 // When performing a global document tear-down, or when going into the page cache, the renderer of the document is cleared.
747 bool renderTreeBeingDestroyed() const;
748
749 void destroy();
750
751 // Virtual function helpers for the deprecated Flexible Box Layout (display: -webkit-box).
752 virtual bool isDeprecatedFlexibleBox() const { return false; }
753
754 // Virtual function helper for the new FlexibleBox Layout (display: -webkit-flex).
755 virtual bool isFlexibleBox() const { return false; }
756
757 bool isFlexibleBoxIncludingDeprecated() const
758 {
759 return isFlexibleBox() || isDeprecatedFlexibleBox();
760 }
761
762 virtual bool isCombineText() const { return false; }
763
764 virtual int caretMinOffset() const;
765 virtual int caretMaxOffset() const;
766
767 virtual int previousOffset(int current) const;
768 virtual int previousOffsetForBackwardDeletion(int current) const;
769 virtual int nextOffset(int current) const;
770
771 void imageChanged(CachedImage*, const IntRect* = nullptr) override;
772 virtual void imageChanged(WrappedImagePtr, const IntRect* = nullptr) { }
773
774 CSSAnimationController& animation() const;
775 DocumentTimeline* documentTimeline() const;
776
777 // Map points and quads through elements, potentially via 3d transforms. You should never need to call these directly; use
778 // localToAbsolute/absoluteToLocal methods instead.
779 virtual void mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState&, MapCoordinatesFlags, bool* wasFixed = nullptr) const;
780 virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const;
781
782 // Pushes state onto RenderGeometryMap about how to map coordinates from this renderer to its container, or ancestorToStopAt (whichever is encountered first).
783 // Returns the renderer which was mapped to (container or ancestorToStopAt).
784 virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const;
785
786 bool shouldUseTransformFromContainer(const RenderObject* container) const;
787 void getTransformFromContainer(const RenderObject* container, const LayoutSize& offsetInContainer, TransformationMatrix&) const;
788
789 virtual void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& /* additionalOffset */, const RenderLayerModelObject* /* paintContainer */ = nullptr) { };
790
791 LayoutRect absoluteOutlineBounds() const
792 {
793 return outlineBoundsForRepaint(nullptr);
794 }
795
796 virtual void willBeRemovedFromTree();
797 void resetFragmentedFlowStateOnRemoval();
798 void initializeFragmentedFlowStateOnInsertion();
799 virtual void insertedIntoTree();
800
801protected:
802 //////////////////////////////////////////
803 // Helper functions. Dangerous to use!
804 void setPreviousSibling(RenderObject* previous) { m_previous = previous; }
805 void setNextSibling(RenderObject* next) { m_next = next; }
806 void setParent(RenderElement*);
807 //////////////////////////////////////////
808 void addPDFURLRect(PaintInfo&, const LayoutPoint&);
809 Node& nodeForNonAnonymous() const { ASSERT(!isAnonymous()); return m_node; }
810
811 void adjustRectForOutlineAndShadow(LayoutRect&) const;
812
813 virtual void willBeDestroyed();
814
815 void setNeedsPositionedMovementLayoutBit(bool b) { m_bitfields.setNeedsPositionedMovementLayout(b); }
816 void setNormalChildNeedsLayoutBit(bool b) { m_bitfields.setNormalChildNeedsLayout(b); }
817 void setPosChildNeedsLayoutBit(bool b) { m_bitfields.setPosChildNeedsLayout(b); }
818 void setNeedsSimplifiedNormalFlowLayoutBit(bool b) { m_bitfields.setNeedsSimplifiedNormalFlowLayout(b); }
819
820 virtual RenderFragmentedFlow* locateEnclosingFragmentedFlow() const;
821 static void calculateBorderStyleColor(const BorderStyle&, const BoxSide&, Color&);
822
823 static FragmentedFlowState computedFragmentedFlowState(const RenderObject&);
824
825 static bool shouldApplyCompositedContainerScrollsForRepaint();
826
827 static VisibleRectContext visibleRectContextForRepaint();
828
829private:
830#ifndef NDEBUG
831 bool isSetNeedsLayoutForbidden() const { return m_setNeedsLayoutForbidden; }
832 void setNeedsLayoutIsForbidden(bool flag) { m_setNeedsLayoutForbidden = flag; }
833#endif
834
835 void addAbsoluteRectForLayer(LayoutRect& result);
836 void setLayerNeedsFullRepaint();
837 void setLayerNeedsFullRepaintForPositionedMovementLayout();
838
839 Node* generatingPseudoHostElement() const;
840
841 void propagateRepaintToParentWithOutlineAutoIfNeeded(const RenderLayerModelObject& repaintContainer, const LayoutRect& repaintRect) const;
842
843 virtual bool isWBR() const { ASSERT_NOT_REACHED(); return false; }
844
845 void setEverHadLayout(bool b) { m_bitfields.setEverHadLayout(b); }
846
847 bool hasRareData() const { return m_bitfields.hasRareData(); }
848 void setHasRareData(bool b) { m_bitfields.setHasRareData(b); }
849
850#ifndef NDEBUG
851 void checkBlockPositionedObjectsNeedLayout();
852#endif
853
854 Node& m_node;
855
856 RenderElement* m_parent;
857 RenderObject* m_previous;
858 RenderObject* m_next;
859
860#ifndef NDEBUG
861 bool m_hasAXObject : 1;
862 bool m_setNeedsLayoutForbidden : 1;
863#endif
864
865#define ADD_BOOLEAN_BITFIELD(name, Name) \
866 private:\
867 unsigned m_##name : 1;\
868 public:\
869 bool name() const { return m_##name; }\
870 void set##Name(bool name) { m_##name = name; }\
871
872#define ADD_ENUM_BITFIELD(name, Name, Type, width) \
873 private:\
874 unsigned m_##name : width;\
875 public:\
876 Type name() const { return static_cast<Type>(m_##name); }\
877 void set##Name(Type name) { m_##name = static_cast<unsigned>(name); }\
878
879 class RenderObjectBitfields {
880 enum PositionedState {
881 IsStaticallyPositioned = 0,
882 IsRelativelyPositioned = 1,
883 IsOutOfFlowPositioned = 2,
884 IsStickilyPositioned = 3
885 };
886
887 public:
888 RenderObjectBitfields(const Node& node)
889 : m_hasRareData(false)
890 , m_beingDestroyed(false)
891 , m_needsLayout(false)
892 , m_needsPositionedMovementLayout(false)
893 , m_normalChildNeedsLayout(false)
894 , m_posChildNeedsLayout(false)
895 , m_needsSimplifiedNormalFlowLayout(false)
896 , m_preferredLogicalWidthsDirty(false)
897 , m_floating(false)
898 , m_isAnonymous(node.isDocumentNode())
899 , m_isTextOrRenderView(false)
900 , m_isBox(false)
901 , m_isInline(true)
902 , m_isReplaced(false)
903 , m_isLineBreak(false)
904 , m_horizontalWritingMode(true)
905 , m_hasLayer(false)
906 , m_hasOverflowClip(false)
907 , m_hasTransformRelatedProperty(false)
908 , m_everHadLayout(false)
909 , m_childrenInline(false)
910 , m_isExcludedFromNormalLayout(false)
911 , m_positionedState(IsStaticallyPositioned)
912 , m_selectionState(SelectionNone)
913 , m_fragmentedFlowState(NotInsideFragmentedFlow)
914 , m_boxDecorationState(NoBoxDecorations)
915 {
916 }
917
918 ADD_BOOLEAN_BITFIELD(hasRareData, HasRareData);
919
920 ADD_BOOLEAN_BITFIELD(beingDestroyed, BeingDestroyed);
921 ADD_BOOLEAN_BITFIELD(needsLayout, NeedsLayout);
922 ADD_BOOLEAN_BITFIELD(needsPositionedMovementLayout, NeedsPositionedMovementLayout);
923 ADD_BOOLEAN_BITFIELD(normalChildNeedsLayout, NormalChildNeedsLayout);
924 ADD_BOOLEAN_BITFIELD(posChildNeedsLayout, PosChildNeedsLayout);
925 ADD_BOOLEAN_BITFIELD(needsSimplifiedNormalFlowLayout, NeedsSimplifiedNormalFlowLayout);
926 ADD_BOOLEAN_BITFIELD(preferredLogicalWidthsDirty, PreferredLogicalWidthsDirty);
927 ADD_BOOLEAN_BITFIELD(floating, Floating);
928
929 ADD_BOOLEAN_BITFIELD(isAnonymous, IsAnonymous);
930 ADD_BOOLEAN_BITFIELD(isTextOrRenderView, IsTextOrRenderView);
931 ADD_BOOLEAN_BITFIELD(isBox, IsBox);
932 ADD_BOOLEAN_BITFIELD(isInline, IsInline);
933 ADD_BOOLEAN_BITFIELD(isReplaced, IsReplaced);
934 ADD_BOOLEAN_BITFIELD(isLineBreak, IsLineBreak);
935 ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode);
936
937 ADD_BOOLEAN_BITFIELD(hasLayer, HasLayer);
938 ADD_BOOLEAN_BITFIELD(hasOverflowClip, HasOverflowClip); // Set in the case of overflow:auto/scroll/hidden
939 ADD_BOOLEAN_BITFIELD(hasTransformRelatedProperty, HasTransformRelatedProperty);
940 ADD_BOOLEAN_BITFIELD(unused, Unused);
941
942 ADD_BOOLEAN_BITFIELD(everHadLayout, EverHadLayout);
943
944 // from RenderBlock
945 ADD_BOOLEAN_BITFIELD(childrenInline, ChildrenInline);
946
947 ADD_BOOLEAN_BITFIELD(isExcludedFromNormalLayout, IsExcludedFromNormalLayout);
948
949 private:
950 unsigned m_positionedState : 2; // PositionedState
951 unsigned m_selectionState : 3; // SelectionState
952 unsigned m_fragmentedFlowState : 2; // FragmentedFlowState
953 unsigned m_boxDecorationState : 2; // BoxDecorationState
954
955 public:
956 bool isOutOfFlowPositioned() const { return m_positionedState == IsOutOfFlowPositioned; }
957 bool isRelativelyPositioned() const { return m_positionedState == IsRelativelyPositioned; }
958 bool isStickilyPositioned() const { return m_positionedState == IsStickilyPositioned; }
959 bool isPositioned() const { return m_positionedState != IsStaticallyPositioned; }
960
961 void setPositionedState(int positionState)
962 {
963 // This mask maps PositionType::Fixed and PositionType::Absolute to IsOutOfFlowPositioned, saving one bit.
964 m_positionedState = static_cast<PositionedState>(positionState & 0x3);
965 }
966 void clearPositionedState() { m_positionedState = static_cast<unsigned>(PositionType::Static); }
967
968 ALWAYS_INLINE SelectionState selectionState() const { return static_cast<SelectionState>(m_selectionState); }
969 ALWAYS_INLINE void setSelectionState(SelectionState selectionState) { m_selectionState = selectionState; }
970
971 ALWAYS_INLINE FragmentedFlowState fragmentedFlowState() const { return static_cast<FragmentedFlowState>(m_fragmentedFlowState); }
972 ALWAYS_INLINE void setFragmentedFlowState(FragmentedFlowState fragmentedFlowState) { m_fragmentedFlowState = fragmentedFlowState; }
973
974 ALWAYS_INLINE BoxDecorationState boxDecorationState() const { return static_cast<BoxDecorationState>(m_boxDecorationState); }
975 ALWAYS_INLINE void setBoxDecorationState(BoxDecorationState boxDecorationState) { m_boxDecorationState = boxDecorationState; }
976 };
977
978 RenderObjectBitfields m_bitfields;
979
980 // FIXME: This should be RenderElementRareData.
981 class RenderObjectRareData {
982 WTF_MAKE_FAST_ALLOCATED;
983 public:
984 RenderObjectRareData()
985 : m_isDragging(false)
986 , m_hasReflection(false)
987 , m_isRenderFragmentedFlow(false)
988 , m_hasOutlineAutoAncestor(false)
989 {
990 }
991 ADD_BOOLEAN_BITFIELD(isDragging, IsDragging);
992 ADD_BOOLEAN_BITFIELD(hasReflection, HasReflection);
993 ADD_BOOLEAN_BITFIELD(isRenderFragmentedFlow, IsRenderFragmentedFlow);
994 ADD_BOOLEAN_BITFIELD(hasOutlineAutoAncestor, HasOutlineAutoAncestor);
995
996 // From RenderElement
997 std::unique_ptr<RenderStyle> cachedFirstLineStyle;
998 };
999
1000 const RenderObject::RenderObjectRareData& rareData() const;
1001 RenderObjectRareData& ensureRareData();
1002 void removeRareData();
1003
1004 typedef HashMap<const RenderObject*, std::unique_ptr<RenderObjectRareData>> RareDataMap;
1005
1006 static RareDataMap& rareDataMap();
1007
1008#undef ADD_BOOLEAN_BITFIELD
1009};
1010
1011inline Frame& RenderObject::frame() const
1012{
1013 return *document().frame();
1014}
1015
1016inline Page& RenderObject::page() const
1017{
1018 // The render tree will always be torn down before Frame is disconnected from Page,
1019 // so it's safe to assume Frame::page() is non-null as long as there are live RenderObjects.
1020 ASSERT(frame().page());
1021 return *frame().page();
1022}
1023
1024inline CSSAnimationController& RenderObject::animation() const
1025{
1026 return frame().animation();
1027}
1028
1029inline DocumentTimeline* RenderObject::documentTimeline() const
1030{
1031 return document().existingTimeline();
1032}
1033
1034inline bool RenderObject::renderTreeBeingDestroyed() const
1035{
1036 return document().renderTreeBeingDestroyed();
1037}
1038
1039inline bool RenderObject::isBeforeContent() const
1040{
1041 // Text nodes don't have their own styles, so ignore the style on a text node.
1042 if (isText())
1043 return false;
1044 if (style().styleType() != PseudoId::Before)
1045 return false;
1046 return true;
1047}
1048
1049inline bool RenderObject::isAfterContent() const
1050{
1051 // Text nodes don't have their own styles, so ignore the style on a text node.
1052 if (isText())
1053 return false;
1054 if (style().styleType() != PseudoId::After)
1055 return false;
1056 return true;
1057}
1058
1059inline bool RenderObject::isBeforeOrAfterContent() const
1060{
1061 return isBeforeContent() || isAfterContent();
1062}
1063
1064inline void RenderObject::setNeedsLayout(MarkingBehavior markParents)
1065{
1066 ASSERT(!isSetNeedsLayoutForbidden());
1067 if (m_bitfields.needsLayout())
1068 return;
1069 m_bitfields.setNeedsLayout(true);
1070 if (markParents == MarkContainingBlockChain)
1071 markContainingBlocksForLayout();
1072 if (hasLayer())
1073 setLayerNeedsFullRepaint();
1074}
1075
1076inline bool RenderObject::preservesNewline() const
1077{
1078 if (isSVGInlineText())
1079 return false;
1080
1081 return style().preserveNewline();
1082}
1083
1084inline void RenderObject::setSelectionStateIfNeeded(SelectionState state)
1085{
1086 if (selectionState() == state)
1087 return;
1088
1089 setSelectionState(state);
1090}
1091
1092inline void RenderObject::setHasVisibleBoxDecorations(bool b)
1093{
1094 if (!b) {
1095 m_bitfields.setBoxDecorationState(NoBoxDecorations);
1096 return;
1097 }
1098 if (hasVisibleBoxDecorations())
1099 return;
1100 m_bitfields.setBoxDecorationState(HasBoxDecorationsAndBackgroundObscurationStatusInvalid);
1101}
1102
1103inline void RenderObject::invalidateBackgroundObscurationStatus()
1104{
1105 if (!hasVisibleBoxDecorations())
1106 return;
1107 m_bitfields.setBoxDecorationState(HasBoxDecorationsAndBackgroundObscurationStatusInvalid);
1108}
1109
1110inline bool RenderObject::backgroundIsKnownToBeObscured(const LayoutPoint& paintOffset)
1111{
1112 if (m_bitfields.boxDecorationState() == HasBoxDecorationsAndBackgroundObscurationStatusInvalid) {
1113 BoxDecorationState boxDecorationState = computeBackgroundIsKnownToBeObscured(paintOffset) ? HasBoxDecorationsAndBackgroundIsKnownToBeObscured : HasBoxDecorationsAndBackgroundMayBeVisible;
1114 m_bitfields.setBoxDecorationState(boxDecorationState);
1115 }
1116 return m_bitfields.boxDecorationState() == HasBoxDecorationsAndBackgroundIsKnownToBeObscured;
1117}
1118
1119inline bool RenderObject::needsSimplifiedNormalFlowLayoutOnly() const
1120{
1121 return m_bitfields.needsSimplifiedNormalFlowLayout() && !m_bitfields.needsLayout() && !m_bitfields.normalChildNeedsLayout()
1122 && !m_bitfields.posChildNeedsLayout() && !m_bitfields.needsPositionedMovementLayout();
1123}
1124
1125#if ENABLE(TREE_DEBUGGING)
1126void printRenderTreeForLiveDocuments();
1127void printLayerTreeForLiveDocuments();
1128void printGraphicsLayerTreeForLiveDocuments();
1129#endif
1130
1131} // namespace WebCore
1132
1133#define SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(ToValueTypeName, predicate) \
1134SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
1135 static bool isType(const WebCore::RenderObject& renderer) { return renderer.predicate; } \
1136SPECIALIZE_TYPE_TRAITS_END()
1137
1138#if ENABLE(TREE_DEBUGGING)
1139// Outside the WebCore namespace for ease of invocation from the debugger.
1140void showNodeTree(const WebCore::RenderObject*);
1141void showLineTree(const WebCore::RenderObject*);
1142void showRenderTree(const WebCore::RenderObject*);
1143#endif
1144