812a80495dea8610eaaa3fc75e1b4aaa167ccc39
[WebKit-https.git] / Source / WebCore / rendering / style / RenderStyle.cpp
1 /*
2  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
3  * Copyright (C) 2004-2017 Apple Inc. All rights reserved.
4  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public License
17  * along with this library; see the file COPYING.LIB.  If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  *
21  */
22
23 #include "config.h"
24 #include "RenderStyle.h"
25
26 #include "ContentData.h"
27 #include "CSSCustomPropertyValue.h"
28 #include "CSSParser.h"
29 #include "CSSPropertyNames.h"
30 #include "CursorList.h"
31 #include "FloatRoundedRect.h"
32 #include "FontCascade.h"
33 #include "FontSelector.h"
34 #include "InlineTextBoxStyle.h"
35 #include "Pagination.h"
36 #include "QuotesData.h"
37 #include "RenderObject.h"
38 #include "RenderTheme.h"
39 #include "RuntimeEnabledFeatures.h"
40 #include "ScaleTransformOperation.h"
41 #include "ShadowData.h"
42 #include "StyleImage.h"
43 #include "StyleInheritedData.h"
44 #include "StyleResolver.h"
45 #include "StyleScrollSnapPoints.h"
46 #include "StyleSelfAlignmentData.h"
47 #include "StyleTreeResolver.h"
48 #include "WillChangeData.h"
49 #include <wtf/MathExtras.h>
50 #include <wtf/PointerComparison.h>
51 #include <wtf/StdLibExtras.h>
52 #include <algorithm>
53
54 #if ENABLE(TEXT_AUTOSIZING)
55 #include <wtf/text/StringHash.h>
56 #endif
57
58 namespace WebCore {
59
60 struct SameSizeAsBorderValue {
61     float m_width;
62     Color m_color;
63     int m_restBits;
64 };
65
66 COMPILE_ASSERT(sizeof(BorderValue) == sizeof(SameSizeAsBorderValue), BorderValue_should_not_grow);
67
68 struct SameSizeAsRenderStyle {
69     void* dataRefs[7];
70     void* ownPtrs[1];
71     void* dataRefSvgStyle;
72     struct InheritedFlags {
73         unsigned m_bitfields[2];
74     } m_inheritedFlags;
75
76     struct NonInheritedFlags {
77         uint64_t m_flags;
78     } m_nonInheritedFlags;
79 #if !ASSERT_DISABLED || ENABLE(SECURITY_ASSERTIONS)
80     bool deletionCheck;
81 #endif
82 };
83
84 COMPILE_ASSERT(sizeof(RenderStyle) == sizeof(SameSizeAsRenderStyle), RenderStyle_should_stay_small);
85
86 RenderStyle& RenderStyle::defaultStyle()
87 {
88     static NeverDestroyed<RenderStyle> style { CreateDefaultStyle };
89     return style;
90 }
91
92 RenderStyle RenderStyle::create()
93 {
94     return clone(defaultStyle());
95 }
96
97 std::unique_ptr<RenderStyle> RenderStyle::createPtr()
98 {
99     return clonePtr(defaultStyle());
100 }
101
102 RenderStyle RenderStyle::clone(const RenderStyle& style)
103 {
104     return RenderStyle(style, Clone);
105 }
106
107 std::unique_ptr<RenderStyle> RenderStyle::clonePtr(const RenderStyle& style)
108 {
109     return std::make_unique<RenderStyle>(style, Clone);
110 }
111
112 RenderStyle RenderStyle::createAnonymousStyleWithDisplay(const RenderStyle& parentStyle, EDisplay display)
113 {
114     auto newStyle = create();
115     newStyle.inheritFrom(parentStyle);
116     newStyle.inheritUnicodeBidiFrom(&parentStyle);
117     newStyle.setDisplay(display);
118     return newStyle;
119 }
120
121 RenderStyle RenderStyle::createStyleInheritingFromPseudoStyle(const RenderStyle& pseudoStyle)
122 {
123     ASSERT(pseudoStyle.styleType() == BEFORE || pseudoStyle.styleType() == AFTER);
124
125     auto style = create();
126     style.inheritFrom(pseudoStyle);
127     return style;
128 }
129
130 RenderStyle::RenderStyle(CreateDefaultStyleTag)
131     : m_boxData(StyleBoxData::create())
132     , m_visualData(StyleVisualData::create())
133     , m_backgroundData(StyleBackgroundData::create())
134     , m_surroundData(StyleSurroundData::create())
135     , m_rareNonInheritedData(StyleRareNonInheritedData::create())
136     , m_rareInheritedData(StyleRareInheritedData::create())
137     , m_inheritedData(StyleInheritedData::create())
138     , m_svgStyle(SVGRenderStyle::create())
139 {
140     m_inheritedFlags.emptyCells = initialEmptyCells();
141     m_inheritedFlags.captionSide = initialCaptionSide();
142     m_inheritedFlags.listStyleType = initialListStyleType();
143     m_inheritedFlags.listStylePosition = initialListStylePosition();
144     m_inheritedFlags.visibility = initialVisibility();
145     m_inheritedFlags.textAlign = initialTextAlign();
146     m_inheritedFlags.textTransform = initialTextTransform();
147     m_inheritedFlags.textDecorations = initialTextDecoration();
148     m_inheritedFlags.cursor = initialCursor();
149 #if ENABLE(CURSOR_VISIBILITY)
150     m_inheritedFlags.cursorVisibility = initialCursorVisibility();
151 #endif
152     m_inheritedFlags.direction = initialDirection();
153     m_inheritedFlags.whiteSpace = initialWhiteSpace();
154     m_inheritedFlags.borderCollapse = initialBorderCollapse();
155     m_inheritedFlags.rtlOrdering = initialRTLOrdering();
156     m_inheritedFlags.boxDirection = initialBoxDirection();
157     m_inheritedFlags.printColorAdjust = initialPrintColorAdjust();
158     m_inheritedFlags.pointerEvents = initialPointerEvents();
159     m_inheritedFlags.insideLink = NotInsideLink;
160     m_inheritedFlags.insideDefaultButton = false;
161     m_inheritedFlags.writingMode = initialWritingMode();
162
163     static_assert((sizeof(InheritedFlags) <= 8), "InheritedFlags does not grow");
164     static_assert((sizeof(NonInheritedFlags) <= 8), "NonInheritedFlags does not grow");
165 }
166
167 inline RenderStyle::RenderStyle(const RenderStyle& other, CloneTag)
168     : m_boxData(other.m_boxData)
169     , m_visualData(other.m_visualData)
170     , m_backgroundData(other.m_backgroundData)
171     , m_surroundData(other.m_surroundData)
172     , m_rareNonInheritedData(other.m_rareNonInheritedData)
173     , m_nonInheritedFlags(other.m_nonInheritedFlags)
174     , m_rareInheritedData(other.m_rareInheritedData)
175     , m_inheritedData(other.m_inheritedData)
176     , m_inheritedFlags(other.m_inheritedFlags)
177     , m_svgStyle(other.m_svgStyle)
178 {
179 }
180
181 inline RenderStyle::RenderStyle(RenderStyle& a, RenderStyle&& b)
182     : m_boxData(a.m_boxData.replace(WTFMove(b.m_boxData)))
183     , m_visualData(a.m_visualData.replace(WTFMove(b.m_visualData)))
184     , m_backgroundData(a.m_backgroundData.replace(WTFMove(b.m_backgroundData)))
185     , m_surroundData(a.m_surroundData.replace(WTFMove(b.m_surroundData)))
186     , m_rareNonInheritedData(a.m_rareNonInheritedData.replace(WTFMove(b.m_rareNonInheritedData)))
187     , m_nonInheritedFlags(std::exchange(a.m_nonInheritedFlags, b.m_nonInheritedFlags))
188     , m_rareInheritedData(a.m_rareInheritedData.replace(WTFMove(b.m_rareInheritedData)))
189     , m_inheritedData(a.m_inheritedData.replace(WTFMove(b.m_inheritedData)))
190     , m_inheritedFlags(std::exchange(a.m_inheritedFlags, b.m_inheritedFlags))
191     , m_cachedPseudoStyles(std::exchange(a.m_cachedPseudoStyles, WTFMove(b.m_cachedPseudoStyles)))
192     , m_svgStyle(a.m_svgStyle.replace(WTFMove(b.m_svgStyle)))
193 {
194 }
195
196 RenderStyle::~RenderStyle()
197 {
198 #if !ASSERT_DISABLED || ENABLE(SECURITY_ASSERTIONS)
199     ASSERT_WITH_SECURITY_IMPLICATION(!m_deletionHasBegun);
200     m_deletionHasBegun = true;
201 #endif
202 }
203
204 RenderStyle RenderStyle::replace(RenderStyle&& newStyle)
205 {
206     return RenderStyle { *this, WTFMove(newStyle) };
207 }
208
209 bool RenderStyle::isCSSGridLayoutEnabled()
210 {
211     return RuntimeEnabledFeatures::sharedFeatures().isCSSGridLayoutEnabled();
212 }
213
214 static StyleSelfAlignmentData resolvedSelfAlignment(const StyleSelfAlignmentData& value, ItemPosition normalValueBehavior)
215 {
216     if (value.position() == ItemPositionNormal || value.position() == ItemPositionAuto)
217         return { normalValueBehavior, OverflowAlignmentDefault };
218     return value;
219 }
220
221 StyleSelfAlignmentData RenderStyle::resolvedAlignItems(ItemPosition normalValueBehaviour) const
222 {
223     return resolvedSelfAlignment(alignItems(), normalValueBehaviour);
224 }
225
226 StyleSelfAlignmentData RenderStyle::resolvedAlignSelf(const RenderStyle* parentStyle, ItemPosition normalValueBehaviour) const
227 {
228     // The auto keyword computes to the parent's align-items computed value.
229     // We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
230     if (!parentStyle || alignSelf().position() != ItemPositionAuto)
231         return resolvedSelfAlignment(alignSelf(), normalValueBehaviour);
232     return parentStyle->resolvedAlignItems(normalValueBehaviour);
233 }
234
235 StyleSelfAlignmentData RenderStyle::resolvedJustifyItems(ItemPosition normalValueBehaviour) const
236 {
237     // FIXME: justify-items 'auto' value is allowed only to provide the 'legacy' keyword's behavior, which it's still not implemented for layout.
238     // "If the inherited value of justify-items includes the legacy keyword, auto computes to the inherited value."
239     // https://drafts.csswg.org/css-align/#justify-items-property
240     if (justifyItems().position() == ItemPositionAuto)
241         return { normalValueBehaviour, OverflowAlignmentDefault };
242     return resolvedSelfAlignment(justifyItems(), normalValueBehaviour);
243 }
244
245 StyleSelfAlignmentData RenderStyle::resolvedJustifySelf(const RenderStyle* parentStyle, ItemPosition normalValueBehaviour) const
246 {
247     // The auto keyword computes to the parent's justify-items computed value.
248     // We will return the behaviour of 'normal' value if needed, which is specific of each layout model.
249     if (!parentStyle || justifySelf().position() != ItemPositionAuto)
250         return resolvedSelfAlignment(justifySelf(), normalValueBehaviour);
251     return parentStyle->resolvedJustifyItems(normalValueBehaviour);
252 }
253
254 static inline ContentPosition resolvedContentAlignmentPosition(const StyleContentAlignmentData& value, const StyleContentAlignmentData& normalValueBehavior)
255 {
256     return (value.position() == ContentPositionNormal && value.distribution() == ContentDistributionDefault) ? normalValueBehavior.position() : value.position();
257 }
258
259 static inline ContentDistributionType resolvedContentAlignmentDistribution(const StyleContentAlignmentData& value, const StyleContentAlignmentData& normalValueBehavior)
260 {
261     return (value.position() == ContentPositionNormal && value.distribution() == ContentDistributionDefault) ? normalValueBehavior.distribution() : value.distribution();
262 }
263
264 ContentPosition RenderStyle::resolvedJustifyContentPosition(const StyleContentAlignmentData& normalValueBehavior) const
265 {
266     return resolvedContentAlignmentPosition(justifyContent(), normalValueBehavior);
267 }
268
269 ContentDistributionType RenderStyle::resolvedJustifyContentDistribution(const StyleContentAlignmentData& normalValueBehavior) const
270 {
271     return resolvedContentAlignmentDistribution(justifyContent(), normalValueBehavior);
272 }
273
274 ContentPosition RenderStyle::resolvedAlignContentPosition(const StyleContentAlignmentData& normalValueBehavior) const
275 {
276     return resolvedContentAlignmentPosition(alignContent(), normalValueBehavior);
277 }
278
279 ContentDistributionType RenderStyle::resolvedAlignContentDistribution(const StyleContentAlignmentData& normalValueBehavior) const
280 {
281     return resolvedContentAlignmentDistribution(alignContent(), normalValueBehavior);
282 }
283
284 void RenderStyle::inheritFrom(const RenderStyle& inheritParent)
285 {
286     m_rareInheritedData = inheritParent.m_rareInheritedData;
287     m_inheritedData = inheritParent.m_inheritedData;
288     m_inheritedFlags = inheritParent.m_inheritedFlags;
289
290     if (m_svgStyle != inheritParent.m_svgStyle)
291         m_svgStyle.access().inheritFrom(inheritParent.m_svgStyle.get());
292 }
293
294 void RenderStyle::copyNonInheritedFrom(const RenderStyle& other)
295 {
296     m_boxData = other.m_boxData;
297     m_visualData = other.m_visualData;
298     m_backgroundData = other.m_backgroundData;
299     m_surroundData = other.m_surroundData;
300     m_rareNonInheritedData = other.m_rareNonInheritedData;
301     m_nonInheritedFlags.copyNonInheritedFrom(other.m_nonInheritedFlags);
302
303     if (m_svgStyle != other.m_svgStyle)
304         m_svgStyle.access().copyNonInheritedFrom(other.m_svgStyle.get());
305
306     ASSERT(zoom() == initialZoom());
307 }
308
309 bool RenderStyle::operator==(const RenderStyle& other) const
310 {
311     // compare everything except the pseudoStyle pointer
312     return m_inheritedFlags == other.m_inheritedFlags
313         && m_nonInheritedFlags == other.m_nonInheritedFlags
314         && m_boxData == other.m_boxData
315         && m_visualData == other.m_visualData
316         && m_backgroundData == other.m_backgroundData
317         && m_surroundData == other.m_surroundData
318         && m_rareNonInheritedData == other.m_rareNonInheritedData
319         && m_rareInheritedData == other.m_rareInheritedData
320         && m_inheritedData == other.m_inheritedData
321         && m_svgStyle == other.m_svgStyle;
322 }
323
324 bool RenderStyle::hasUniquePseudoStyle() const
325 {
326     if (!m_cachedPseudoStyles || styleType() != NOPSEUDO)
327         return false;
328
329     for (auto& pseudoStyle : *m_cachedPseudoStyles) {
330         if (pseudoStyle->unique())
331             return true;
332     }
333
334     return false;
335 }
336
337 RenderStyle* RenderStyle::getCachedPseudoStyle(PseudoId pid) const
338 {
339     if (!m_cachedPseudoStyles || !m_cachedPseudoStyles->size())
340         return nullptr;
341
342     if (styleType() != NOPSEUDO) 
343         return nullptr;
344
345     for (auto& pseudoStyle : *m_cachedPseudoStyles) {
346         if (pseudoStyle->styleType() == pid)
347             return pseudoStyle.get();
348     }
349
350     return nullptr;
351 }
352
353 RenderStyle* RenderStyle::addCachedPseudoStyle(std::unique_ptr<RenderStyle> pseudo)
354 {
355     if (!pseudo)
356         return nullptr;
357
358     ASSERT(pseudo->styleType() > NOPSEUDO);
359
360     RenderStyle* result = pseudo.get();
361
362     if (!m_cachedPseudoStyles)
363         m_cachedPseudoStyles = std::make_unique<PseudoStyleCache>();
364
365     m_cachedPseudoStyles->append(WTFMove(pseudo));
366
367     return result;
368 }
369
370 void RenderStyle::removeCachedPseudoStyle(PseudoId pid)
371 {
372     if (!m_cachedPseudoStyles)
373         return;
374     for (size_t i = 0; i < m_cachedPseudoStyles->size(); ++i) {
375         RenderStyle* pseudoStyle = m_cachedPseudoStyles->at(i).get();
376         if (pseudoStyle->styleType() == pid) {
377             m_cachedPseudoStyles->remove(i);
378             return;
379         }
380     }
381 }
382
383 bool RenderStyle::inheritedNotEqual(const RenderStyle* other) const
384 {
385     return m_inheritedFlags != other->m_inheritedFlags
386         || m_inheritedData != other->m_inheritedData
387         || m_svgStyle->inheritedNotEqual(other->m_svgStyle)
388         || m_rareInheritedData != other->m_rareInheritedData;
389 }
390
391 #if ENABLE(TEXT_AUTOSIZING)
392
393 static inline unsigned computeFontHash(const FontCascade& font)
394 {
395     IntegerHasher hasher;
396     hasher.add(ASCIICaseInsensitiveHash::hash(font.fontDescription().firstFamily()));
397     hasher.add(font.fontDescription().specifiedSize());
398     return hasher.hash();
399 }
400
401 unsigned RenderStyle::hashForTextAutosizing() const
402 {
403     // FIXME: Not a very smart hash. Could be improved upon. See <https://bugs.webkit.org/show_bug.cgi?id=121131>.
404     unsigned hash = m_rareNonInheritedData->appearance;
405     hash ^= m_rareNonInheritedData->marginBeforeCollapse;
406     hash ^= m_rareNonInheritedData->marginAfterCollapse;
407     hash ^= m_rareNonInheritedData->lineClamp.value();
408     hash ^= m_rareInheritedData->overflowWrap;
409     hash ^= m_rareInheritedData->nbspMode;
410     hash ^= m_rareInheritedData->lineBreak;
411     hash ^= WTF::FloatHash<float>::hash(m_inheritedData->specifiedLineHeight.value());
412     hash ^= computeFontHash(m_inheritedData->fontCascade);
413     hash ^= WTF::FloatHash<float>::hash(m_inheritedData->horizontalBorderSpacing);
414     hash ^= WTF::FloatHash<float>::hash(m_inheritedData->verticalBorderSpacing);
415     hash ^= m_inheritedFlags.boxDirection;
416     hash ^= m_inheritedFlags.rtlOrdering;
417     hash ^= m_nonInheritedFlags.position();
418     hash ^= m_nonInheritedFlags.floating();
419     hash ^= m_rareNonInheritedData->textOverflow;
420     hash ^= m_rareInheritedData->textSecurity;
421     return hash;
422 }
423
424 bool RenderStyle::equalForTextAutosizing(const RenderStyle& other) const
425 {
426     return m_rareNonInheritedData->appearance == other.m_rareNonInheritedData->appearance
427         && m_rareNonInheritedData->marginBeforeCollapse == other.m_rareNonInheritedData->marginBeforeCollapse
428         && m_rareNonInheritedData->marginAfterCollapse == other.m_rareNonInheritedData->marginAfterCollapse
429         && m_rareNonInheritedData->lineClamp == other.m_rareNonInheritedData->lineClamp
430         && m_rareInheritedData->textSizeAdjust == other.m_rareInheritedData->textSizeAdjust
431         && m_rareInheritedData->overflowWrap == other.m_rareInheritedData->overflowWrap
432         && m_rareInheritedData->nbspMode == other.m_rareInheritedData->nbspMode
433         && m_rareInheritedData->lineBreak == other.m_rareInheritedData->lineBreak
434         && m_rareInheritedData->textSecurity == other.m_rareInheritedData->textSecurity
435         && m_inheritedData->specifiedLineHeight == other.m_inheritedData->specifiedLineHeight
436         && m_inheritedData->fontCascade.equalForTextAutoSizing(other.m_inheritedData->fontCascade)
437         && m_inheritedData->horizontalBorderSpacing == other.m_inheritedData->horizontalBorderSpacing
438         && m_inheritedData->verticalBorderSpacing == other.m_inheritedData->verticalBorderSpacing
439         && m_inheritedFlags.boxDirection == other.m_inheritedFlags.boxDirection
440         && m_inheritedFlags.rtlOrdering == other.m_inheritedFlags.rtlOrdering
441         && m_nonInheritedFlags.position() == other.m_nonInheritedFlags.position()
442         && m_nonInheritedFlags.floating() == other.m_nonInheritedFlags.floating()
443         && m_rareNonInheritedData->textOverflow == other.m_rareNonInheritedData->textOverflow;
444 }
445
446 #endif // ENABLE(TEXT_AUTOSIZING)
447
448 bool RenderStyle::inheritedDataShared(const RenderStyle* other) const
449 {
450     // This is a fast check that only looks if the data structures are shared.
451     return m_inheritedFlags == other->m_inheritedFlags
452         && m_inheritedData.get() == other->m_inheritedData.get()
453         && m_svgStyle.get() == other->m_svgStyle.get()
454         && m_rareInheritedData.get() == other->m_rareInheritedData.get();
455 }
456
457 static bool positionChangeIsMovementOnly(const LengthBox& a, const LengthBox& b, const Length& width)
458 {
459     // If any unit types are different, then we can't guarantee
460     // that this was just a movement.
461     if (a.left().type() != b.left().type()
462         || a.right().type() != b.right().type()
463         || a.top().type() != b.top().type()
464         || a.bottom().type() != b.bottom().type())
465         return false;
466
467     // Only one unit can be non-auto in the horizontal direction and
468     // in the vertical direction.  Otherwise the adjustment of values
469     // is changing the size of the box.
470     if (!a.left().isIntrinsicOrAuto() && !a.right().isIntrinsicOrAuto())
471         return false;
472     if (!a.top().isIntrinsicOrAuto() && !a.bottom().isIntrinsicOrAuto())
473         return false;
474     // If our width is auto and left or right is specified then this 
475     // is not just a movement - we need to resize to our container.
476     if ((!a.left().isIntrinsicOrAuto() || !a.right().isIntrinsicOrAuto()) && width.isIntrinsicOrAuto())
477         return false;
478
479     // One of the units is fixed or percent in both directions and stayed
480     // that way in the new style.  Therefore all we are doing is moving.
481     return true;
482 }
483
484 inline bool RenderStyle::changeAffectsVisualOverflow(const RenderStyle& other) const
485 {
486     if (m_rareNonInheritedData.get() != other.m_rareNonInheritedData.get()
487         && !arePointingToEqualData(m_rareNonInheritedData->boxShadow, other.m_rareNonInheritedData->boxShadow))
488         return true;
489
490     if (m_rareInheritedData.get() != other.m_rareInheritedData.get()
491         && !arePointingToEqualData(m_rareInheritedData->textShadow, other.m_rareInheritedData->textShadow))
492         return true;
493
494     if (m_inheritedFlags.textDecorations != other.m_inheritedFlags.textDecorations
495         || m_visualData->textDecoration != other.m_visualData->textDecoration
496         || m_rareNonInheritedData->textDecorationStyle != other.m_rareNonInheritedData->textDecorationStyle) {
497         // Underlines are always drawn outside of their textbox bounds when text-underline-position: under;
498         // is specified. We can take an early out here.
499         if (textUnderlinePosition() == TextUnderlinePositionUnder
500             || other.textUnderlinePosition() == TextUnderlinePositionUnder)
501             return true;
502         return visualOverflowForDecorations(*this, nullptr) != visualOverflowForDecorations(other, nullptr);
503     }
504
505     if (hasOutlineInVisualOverflow() != other.hasOutlineInVisualOverflow())
506         return true;
507     return false;
508 }
509
510 bool RenderStyle::changeRequiresLayout(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
511 {
512     if (m_boxData->width() != other.m_boxData->width()
513         || m_boxData->minWidth() != other.m_boxData->minWidth()
514         || m_boxData->maxWidth() != other.m_boxData->maxWidth()
515         || m_boxData->height() != other.m_boxData->height()
516         || m_boxData->minHeight() != other.m_boxData->minHeight()
517         || m_boxData->maxHeight() != other.m_boxData->maxHeight())
518         return true;
519
520     if (m_boxData->verticalAlign() != other.m_boxData->verticalAlign() || m_nonInheritedFlags.verticalAlign() != other.m_nonInheritedFlags.verticalAlign())
521         return true;
522
523     if (m_boxData->boxSizing() != other.m_boxData->boxSizing())
524         return true;
525
526     if (m_surroundData->margin != other.m_surroundData->margin)
527         return true;
528
529     if (m_surroundData->padding != other.m_surroundData->padding)
530         return true;
531
532     // FIXME: We should add an optimized form of layout that just recomputes visual overflow.
533     if (changeAffectsVisualOverflow(other))
534         return true;
535
536     if (m_rareNonInheritedData.get() != other.m_rareNonInheritedData.get()) {
537         if (m_rareNonInheritedData->appearance != other.m_rareNonInheritedData->appearance
538             || m_rareNonInheritedData->marginBeforeCollapse != other.m_rareNonInheritedData->marginBeforeCollapse
539             || m_rareNonInheritedData->marginAfterCollapse != other.m_rareNonInheritedData->marginAfterCollapse
540             || m_rareNonInheritedData->lineClamp != other.m_rareNonInheritedData->lineClamp
541             || m_rareNonInheritedData->initialLetter != other.m_rareNonInheritedData->initialLetter
542             || m_rareNonInheritedData->textOverflow != other.m_rareNonInheritedData->textOverflow)
543             return true;
544
545         if (m_rareNonInheritedData->regionFragment != other.m_rareNonInheritedData->regionFragment)
546             return true;
547
548         if (m_rareNonInheritedData->shapeMargin != other.m_rareNonInheritedData->shapeMargin)
549             return true;
550
551         if (m_rareNonInheritedData->deprecatedFlexibleBox != other.m_rareNonInheritedData->deprecatedFlexibleBox)
552             return true;
553
554         if (m_rareNonInheritedData->flexibleBox != other.m_rareNonInheritedData->flexibleBox)
555             return true;
556
557         if (m_rareNonInheritedData->order != other.m_rareNonInheritedData->order
558             || m_rareNonInheritedData->alignContent != other.m_rareNonInheritedData->alignContent
559             || m_rareNonInheritedData->alignItems != other.m_rareNonInheritedData->alignItems
560             || m_rareNonInheritedData->alignSelf != other.m_rareNonInheritedData->alignSelf
561             || m_rareNonInheritedData->justifyContent != other.m_rareNonInheritedData->justifyContent
562             || m_rareNonInheritedData->justifyItems != other.m_rareNonInheritedData->justifyItems
563             || m_rareNonInheritedData->justifySelf != other.m_rareNonInheritedData->justifySelf)
564             return true;
565
566         if (!arePointingToEqualData(m_rareNonInheritedData->boxReflect, other.m_rareNonInheritedData->boxReflect))
567             return true;
568
569         if (m_rareNonInheritedData->multiCol != other.m_rareNonInheritedData->multiCol)
570             return true;
571
572         if (m_rareNonInheritedData->transform != other.m_rareNonInheritedData->transform) {
573             if (m_rareNonInheritedData->transform->hasTransform() != other.m_rareNonInheritedData->transform->hasTransform())
574                 return true;
575             if (*m_rareNonInheritedData->transform != *other.m_rareNonInheritedData->transform) {
576                 changedContextSensitiveProperties |= ContextSensitivePropertyTransform;
577                 // Don't return; keep looking for another change
578             }
579         }
580
581         if (m_rareNonInheritedData->grid != other.m_rareNonInheritedData->grid
582             || m_rareNonInheritedData->gridItem != other.m_rareNonInheritedData->gridItem)
583             return true;
584
585 #if ENABLE(DASHBOARD_SUPPORT)
586         // If regions change, trigger a relayout to re-calc regions.
587         if (m_rareNonInheritedData->dashboardRegions != other.m_rareNonInheritedData->dashboardRegions)
588             return true;
589 #endif
590
591         if (!arePointingToEqualData(m_rareNonInheritedData->willChange, other.m_rareNonInheritedData->willChange)) {
592             changedContextSensitiveProperties |= ContextSensitivePropertyWillChange;
593             // Don't return; keep looking for another change
594         }
595     }
596
597     if (m_rareInheritedData.get() != other.m_rareInheritedData.get()) {
598         if (m_rareInheritedData->indent != other.m_rareInheritedData->indent
599 #if ENABLE(CSS3_TEXT)
600             || m_rareInheritedData->textAlignLast != other.m_rareInheritedData->textAlignLast
601             || m_rareInheritedData->textJustify != other.m_rareInheritedData->textJustify
602             || m_rareInheritedData->textIndentLine != other.m_rareInheritedData->textIndentLine
603 #endif
604             || m_rareInheritedData->effectiveZoom != other.m_rareInheritedData->effectiveZoom
605             || m_rareInheritedData->textZoom != other.m_rareInheritedData->textZoom
606 #if ENABLE(TEXT_AUTOSIZING)
607             || m_rareInheritedData->textSizeAdjust != other.m_rareInheritedData->textSizeAdjust
608 #endif
609             || m_rareInheritedData->wordBreak != other.m_rareInheritedData->wordBreak
610             || m_rareInheritedData->overflowWrap != other.m_rareInheritedData->overflowWrap
611             || m_rareInheritedData->nbspMode != other.m_rareInheritedData->nbspMode
612             || m_rareInheritedData->lineBreak != other.m_rareInheritedData->lineBreak
613             || m_rareInheritedData->textSecurity != other.m_rareInheritedData->textSecurity
614             || m_rareInheritedData->hyphens != other.m_rareInheritedData->hyphens
615             || m_rareInheritedData->hyphenationLimitBefore != other.m_rareInheritedData->hyphenationLimitBefore
616             || m_rareInheritedData->hyphenationLimitAfter != other.m_rareInheritedData->hyphenationLimitAfter
617             || m_rareInheritedData->hyphenationString != other.m_rareInheritedData->hyphenationString
618             || m_rareInheritedData->rubyPosition != other.m_rareInheritedData->rubyPosition
619             || m_rareInheritedData->textEmphasisMark != other.m_rareInheritedData->textEmphasisMark
620             || m_rareInheritedData->textEmphasisPosition != other.m_rareInheritedData->textEmphasisPosition
621             || m_rareInheritedData->textEmphasisCustomMark != other.m_rareInheritedData->textEmphasisCustomMark
622             || m_rareInheritedData->textOrientation != other.m_rareInheritedData->textOrientation
623             || m_rareInheritedData->tabSize != other.m_rareInheritedData->tabSize
624             || m_rareInheritedData->lineBoxContain != other.m_rareInheritedData->lineBoxContain
625             || m_rareInheritedData->lineGrid != other.m_rareInheritedData->lineGrid
626 #if ENABLE(CSS_IMAGE_ORIENTATION)
627             || m_rareInheritedData->imageOrientation != other.m_rareInheritedData->imageOrientation
628 #endif
629 #if ENABLE(CSS_IMAGE_RESOLUTION)
630             || m_rareInheritedData->imageResolutionSource != other.m_rareInheritedData->imageResolutionSource
631             || m_rareInheritedData->imageResolutionSnap != other.m_rareInheritedData->imageResolutionSnap
632             || m_rareInheritedData->imageResolution != other.m_rareInheritedData->imageResolution
633 #endif
634             || m_rareInheritedData->lineSnap != other.m_rareInheritedData->lineSnap
635             || m_rareInheritedData->lineAlign != other.m_rareInheritedData->lineAlign
636             || m_rareInheritedData->hangingPunctuation != other.m_rareInheritedData->hangingPunctuation
637 #if ENABLE(ACCELERATED_OVERFLOW_SCROLLING)
638             || m_rareInheritedData->useTouchOverflowScrolling != other.m_rareInheritedData->useTouchOverflowScrolling
639 #endif
640             || m_rareInheritedData->listStyleImage != other.m_rareInheritedData->listStyleImage) // FIXME: needs arePointingToEqualData()?
641             return true;
642
643         if (textStrokeWidth() != other.textStrokeWidth())
644             return true;
645         
646         // These properties affect the cached stroke bounding box rects.
647         if (m_rareInheritedData->capStyle != other.m_rareInheritedData->capStyle
648             || m_rareInheritedData->joinStyle != other.m_rareInheritedData->joinStyle
649             || m_rareInheritedData->strokeWidth != other.m_rareInheritedData->strokeWidth
650             || m_rareInheritedData->miterLimit != other.m_rareInheritedData->miterLimit)
651             return true;
652     }
653
654     if (m_inheritedData->lineHeight != other.m_inheritedData->lineHeight
655 #if ENABLE(TEXT_AUTOSIZING)
656         || m_inheritedData->specifiedLineHeight != other.m_inheritedData->specifiedLineHeight
657 #endif
658         || m_inheritedData->fontCascade != other.m_inheritedData->fontCascade
659         || m_inheritedData->horizontalBorderSpacing != other.m_inheritedData->horizontalBorderSpacing
660         || m_inheritedData->verticalBorderSpacing != other.m_inheritedData->verticalBorderSpacing
661         || m_inheritedFlags.boxDirection != other.m_inheritedFlags.boxDirection
662         || m_inheritedFlags.rtlOrdering != other.m_inheritedFlags.rtlOrdering
663         || m_nonInheritedFlags.position() != other.m_nonInheritedFlags.position()
664         || m_nonInheritedFlags.floating() != other.m_nonInheritedFlags.floating()
665         || m_nonInheritedFlags.originalDisplay() != other.m_nonInheritedFlags.originalDisplay())
666         return true;
667
668
669     if ((m_nonInheritedFlags.effectiveDisplay()) >= TABLE) {
670         if (m_inheritedFlags.borderCollapse != other.m_inheritedFlags.borderCollapse
671             || m_inheritedFlags.emptyCells != other.m_inheritedFlags.emptyCells
672             || m_inheritedFlags.captionSide != other.m_inheritedFlags.captionSide
673             || m_nonInheritedFlags.tableLayout() != other.m_nonInheritedFlags.tableLayout())
674             return true;
675
676         // In the collapsing border model, 'hidden' suppresses other borders, while 'none'
677         // does not, so these style differences can be width differences.
678         if (m_inheritedFlags.borderCollapse
679             && ((borderTopStyle() == BHIDDEN && other.borderTopStyle() == BNONE)
680                 || (borderTopStyle() == BNONE && other.borderTopStyle() == BHIDDEN)
681                 || (borderBottomStyle() == BHIDDEN && other.borderBottomStyle() == BNONE)
682                 || (borderBottomStyle() == BNONE && other.borderBottomStyle() == BHIDDEN)
683                 || (borderLeftStyle() == BHIDDEN && other.borderLeftStyle() == BNONE)
684                 || (borderLeftStyle() == BNONE && other.borderLeftStyle() == BHIDDEN)
685                 || (borderRightStyle() == BHIDDEN && other.borderRightStyle() == BNONE)
686                 || (borderRightStyle() == BNONE && other.borderRightStyle() == BHIDDEN)))
687             return true;
688     }
689
690     if (m_nonInheritedFlags.effectiveDisplay() == LIST_ITEM) {
691         if (m_inheritedFlags.listStyleType != other.m_inheritedFlags.listStyleType
692             || m_inheritedFlags.listStylePosition != other.m_inheritedFlags.listStylePosition)
693             return true;
694     }
695
696     if (m_inheritedFlags.textAlign != other.m_inheritedFlags.textAlign
697         || m_inheritedFlags.textTransform != other.m_inheritedFlags.textTransform
698         || m_inheritedFlags.direction != other.m_inheritedFlags.direction
699         || m_inheritedFlags.whiteSpace != other.m_inheritedFlags.whiteSpace
700         || m_nonInheritedFlags.clear() != other.m_nonInheritedFlags.clear()
701         || m_nonInheritedFlags.unicodeBidi() != other.m_nonInheritedFlags.unicodeBidi())
702         return true;
703
704     // Check block flow direction.
705     if (m_inheritedFlags.writingMode != other.m_inheritedFlags.writingMode)
706         return true;
707
708     // Check text combine mode.
709     if (m_rareNonInheritedData->textCombine != other.m_rareNonInheritedData->textCombine)
710         return true;
711
712     // Check breaks.
713     if (m_rareNonInheritedData->breakBefore != other.m_rareNonInheritedData->breakBefore
714         || m_rareNonInheritedData->breakAfter != other.m_rareNonInheritedData->breakAfter
715         || m_rareNonInheritedData->breakInside != other.m_rareNonInheritedData->breakInside)
716         return true;
717
718     // Overflow returns a layout hint.
719     if (m_nonInheritedFlags.overflowX() != other.m_nonInheritedFlags.overflowX()
720         || m_nonInheritedFlags.overflowY() != other.m_nonInheritedFlags.overflowY())
721         return true;
722
723     // If our border widths change, then we need to layout.  Other changes to borders
724     // only necessitate a repaint.
725     if (borderLeftWidth() != other.borderLeftWidth()
726         || borderTopWidth() != other.borderTopWidth()
727         || borderBottomWidth() != other.borderBottomWidth()
728         || borderRightWidth() != other.borderRightWidth())
729         return true;
730
731     // If the counter directives change, trigger a relayout to re-calculate counter values and rebuild the counter node tree.
732     if (!arePointingToEqualData(m_rareNonInheritedData->counterDirectives, other.m_rareNonInheritedData->counterDirectives))
733         return true;
734
735     if ((visibility() == COLLAPSE) != (other.visibility() == COLLAPSE))
736         return true;
737
738     if (m_rareNonInheritedData->hasOpacity() != other.m_rareNonInheritedData->hasOpacity()) {
739         // FIXME: We would like to use SimplifiedLayout here, but we can't quite do that yet.
740         // We need to make sure SimplifiedLayout can operate correctly on RenderInlines (we will need
741         // to add a selfNeedsSimplifiedLayout bit in order to not get confused and taint every line).
742         // In addition we need to solve the floating object issue when layers come and go. Right now
743         // a full layout is necessary to keep floating object lists sane.
744         return true;
745     }
746
747     if (m_rareNonInheritedData->hasFilters() != other.m_rareNonInheritedData->hasFilters())
748         return true;
749
750 #if ENABLE(FILTERS_LEVEL_2)
751     if (m_rareNonInheritedData->hasBackdropFilters() != other.m_rareNonInheritedData->hasBackdropFilters())
752         return true;
753 #endif
754
755     if (!arePointingToEqualData(m_rareInheritedData->quotes, other.m_rareInheritedData->quotes))
756         return true;
757
758     if (position() != StaticPosition) {
759         if (m_surroundData->offset != other.m_surroundData->offset) {
760             // FIXME: We would like to use SimplifiedLayout for relative positioning, but we can't quite do that yet.
761             // We need to make sure SimplifiedLayout can operate correctly on RenderInlines (we will need
762             // to add a selfNeedsSimplifiedLayout bit in order to not get confused and taint every line).
763             if (position() != AbsolutePosition)
764                 return true;
765
766             // Optimize for the case where a positioned layer is moving but not changing size.
767             if (!positionChangeIsMovementOnly(m_surroundData->offset, other.m_surroundData->offset, m_boxData->width()))
768                 return true;
769         }
770     }
771
772     bool hasFirstLineStyle = hasPseudoStyle(FIRST_LINE);
773     if (hasFirstLineStyle != other.hasPseudoStyle(FIRST_LINE))
774         return true;
775     if (hasFirstLineStyle) {
776         auto* firstLineStyle = getCachedPseudoStyle(FIRST_LINE);
777         if (!firstLineStyle)
778             return true;
779         auto* otherFirstLineStyle = other.getCachedPseudoStyle(FIRST_LINE);
780         if (!otherFirstLineStyle)
781             return true;
782         // FIXME: Not all first line style changes actually need layout.
783         if (*firstLineStyle != *otherFirstLineStyle)
784             return true;
785     }
786
787     return false;
788 }
789
790 bool RenderStyle::changeRequiresPositionedLayoutOnly(const RenderStyle& other, unsigned&) const
791 {
792     if (position() == StaticPosition)
793         return false;
794
795     if (m_surroundData->offset != other.m_surroundData->offset) {
796         // Optimize for the case where a positioned layer is moving but not changing size.
797         if (position() == AbsolutePosition && positionChangeIsMovementOnly(m_surroundData->offset, other.m_surroundData->offset, m_boxData->width()))
798             return true;
799     }
800     
801     return false;
802 }
803
804 bool RenderStyle::changeRequiresLayerRepaint(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
805 {
806     // StyleResolver has ensured that zIndex is non-auto only if it's applicable.
807     if (m_boxData->zIndex() != other.m_boxData->zIndex() || m_boxData->hasAutoZIndex() != other.m_boxData->hasAutoZIndex())
808         return true;
809
810     if (position() != StaticPosition) {
811         if (m_visualData->clip != other.m_visualData->clip || m_visualData->hasClip != other.m_visualData->hasClip) {
812             changedContextSensitiveProperties |= ContextSensitivePropertyClipRect;
813             return true;
814         }
815     }
816
817 #if ENABLE(CSS_COMPOSITING)
818     if (m_rareNonInheritedData->effectiveBlendMode != other.m_rareNonInheritedData->effectiveBlendMode)
819         return true;
820 #endif
821
822     if (m_rareNonInheritedData->opacity != other.m_rareNonInheritedData->opacity) {
823         changedContextSensitiveProperties |= ContextSensitivePropertyOpacity;
824         // Don't return; keep looking for another change.
825     }
826
827     if (m_rareNonInheritedData->filter != other.m_rareNonInheritedData->filter) {
828         changedContextSensitiveProperties |= ContextSensitivePropertyFilter;
829         // Don't return; keep looking for another change.
830     }
831
832 #if ENABLE(FILTERS_LEVEL_2)
833     if (m_rareNonInheritedData->backdropFilter != other.m_rareNonInheritedData->backdropFilter) {
834         changedContextSensitiveProperties |= ContextSensitivePropertyFilter;
835         // Don't return; keep looking for another change.
836     }
837 #endif
838
839     if (m_rareNonInheritedData->mask != other.m_rareNonInheritedData->mask
840         || m_rareNonInheritedData->maskBoxImage != other.m_rareNonInheritedData->maskBoxImage)
841         return true;
842
843     return false;
844 }
845
846 bool RenderStyle::changeRequiresRepaint(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
847 {
848     if (m_inheritedFlags.visibility != other.m_inheritedFlags.visibility
849         || m_inheritedFlags.printColorAdjust != other.m_inheritedFlags.printColorAdjust
850         || m_inheritedFlags.insideLink != other.m_inheritedFlags.insideLink
851         || m_inheritedFlags.insideDefaultButton != other.m_inheritedFlags.insideDefaultButton
852         || m_surroundData->border != other.m_surroundData->border
853         || !m_backgroundData->isEquivalentForPainting(*other.m_backgroundData)
854         || m_rareInheritedData->userModify != other.m_rareInheritedData->userModify
855         || m_rareInheritedData->userSelect != other.m_rareInheritedData->userSelect
856         || m_rareNonInheritedData->userDrag != other.m_rareNonInheritedData->userDrag
857         || m_rareNonInheritedData->borderFit != other.m_rareNonInheritedData->borderFit
858         || m_rareNonInheritedData->objectFit != other.m_rareNonInheritedData->objectFit
859         || m_rareNonInheritedData->objectPosition != other.m_rareNonInheritedData->objectPosition
860         || m_rareInheritedData->imageRendering != other.m_rareInheritedData->imageRendering)
861         return true;
862
863     if (m_rareNonInheritedData->isNotFinal != other.m_rareNonInheritedData->isNotFinal)
864         return true;
865
866     if (m_rareNonInheritedData->shapeOutside != other.m_rareNonInheritedData->shapeOutside)
867         return true;
868
869     // FIXME: this should probably be moved to changeRequiresLayerRepaint().
870     if (m_rareNonInheritedData->clipPath != other.m_rareNonInheritedData->clipPath) {
871         changedContextSensitiveProperties |= ContextSensitivePropertyClipPath;
872         // Don't return; keep looking for another change.
873     }
874
875     return false;
876 }
877
878 bool RenderStyle::changeRequiresRepaintIfTextOrBorderOrOutline(const RenderStyle& other, unsigned&) const
879 {
880     if (m_inheritedData->color != other.m_inheritedData->color
881         || m_inheritedFlags.textDecorations != other.m_inheritedFlags.textDecorations
882         || m_visualData->textDecoration != other.m_visualData->textDecoration
883         || m_rareNonInheritedData->textDecorationStyle != other.m_rareNonInheritedData->textDecorationStyle
884         || m_rareNonInheritedData->textDecorationColor != other.m_rareNonInheritedData->textDecorationColor
885         || m_rareInheritedData->textDecorationSkip != other.m_rareInheritedData->textDecorationSkip
886         || m_rareInheritedData->textFillColor != other.m_rareInheritedData->textFillColor
887         || m_rareInheritedData->textStrokeColor != other.m_rareInheritedData->textStrokeColor
888         || m_rareInheritedData->textEmphasisColor != other.m_rareInheritedData->textEmphasisColor
889         || m_rareInheritedData->textEmphasisFill != other.m_rareInheritedData->textEmphasisFill
890         || m_rareInheritedData->strokeColor != other.m_rareInheritedData->strokeColor)
891         return true;
892
893     return false;
894 }
895
896 bool RenderStyle::changeRequiresRecompositeLayer(const RenderStyle& other, unsigned&) const
897 {
898     if (m_rareNonInheritedData.get() != other.m_rareNonInheritedData.get()) {
899         if (m_rareNonInheritedData->transformStyle3D != other.m_rareNonInheritedData->transformStyle3D
900             || m_rareNonInheritedData->backfaceVisibility != other.m_rareNonInheritedData->backfaceVisibility
901             || m_rareNonInheritedData->perspective != other.m_rareNonInheritedData->perspective
902             || m_rareNonInheritedData->perspectiveOriginX != other.m_rareNonInheritedData->perspectiveOriginX
903             || m_rareNonInheritedData->perspectiveOriginY != other.m_rareNonInheritedData->perspectiveOriginY)
904             return true;
905     }
906
907     return false;
908 }
909
910 StyleDifference RenderStyle::diff(const RenderStyle& other, unsigned& changedContextSensitiveProperties) const
911 {
912     changedContextSensitiveProperties = ContextSensitivePropertyNone;
913
914     StyleDifference svgChange = StyleDifferenceEqual;
915     if (m_svgStyle != other.m_svgStyle) {
916         svgChange = m_svgStyle->diff(other.m_svgStyle.get());
917         if (svgChange == StyleDifferenceLayout)
918             return svgChange;
919     }
920
921     if (changeRequiresLayout(other, changedContextSensitiveProperties))
922         return StyleDifferenceLayout;
923
924     // SVGRenderStyle::diff() might have returned StyleDifferenceRepaint, eg. if fill changes.
925     // If eg. the font-size changed at the same time, we're not allowed to return StyleDifferenceRepaint,
926     // but have to return StyleDifferenceLayout, that's why  this if branch comes after all branches
927     // that are relevant for SVG and might return StyleDifferenceLayout.
928     if (svgChange != StyleDifferenceEqual)
929         return svgChange;
930
931     if (changeRequiresPositionedLayoutOnly(other, changedContextSensitiveProperties))
932         return StyleDifferenceLayoutPositionedMovementOnly;
933
934     if (changeRequiresLayerRepaint(other, changedContextSensitiveProperties))
935         return StyleDifferenceRepaintLayer;
936
937     if (changeRequiresRepaint(other, changedContextSensitiveProperties))
938         return StyleDifferenceRepaint;
939
940     if (changeRequiresRecompositeLayer(other, changedContextSensitiveProperties))
941         return StyleDifferenceRecompositeLayer;
942
943     if (changeRequiresRepaintIfTextOrBorderOrOutline(other, changedContextSensitiveProperties))
944         return StyleDifferenceRepaintIfTextOrBorderOrOutline;
945
946     // Cursors are not checked, since they will be set appropriately in response to mouse events,
947     // so they don't need to cause any repaint or layout.
948
949     // Animations don't need to be checked either.  We always set the new style on the RenderObject, so we will get a chance to fire off
950     // the resulting transition properly.
951     return StyleDifferenceEqual;
952 }
953
954 bool RenderStyle::diffRequiresLayerRepaint(const RenderStyle& style, bool isComposited) const
955 {
956     unsigned changedContextSensitiveProperties = 0;
957
958     if (changeRequiresRepaint(style, changedContextSensitiveProperties))
959         return true;
960
961     if (isComposited && changeRequiresLayerRepaint(style, changedContextSensitiveProperties))
962         return changedContextSensitiveProperties & ContextSensitivePropertyClipRect;
963
964     return false;
965 }
966
967 void RenderStyle::setClip(Length&& top, Length&& right, Length&& bottom, Length&& left)
968 {
969     auto& data = m_visualData.access();
970     data.clip.top() = WTFMove(top);
971     data.clip.right() = WTFMove(right);
972     data.clip.bottom() = WTFMove(bottom);
973     data.clip.left() = WTFMove(left);
974 }
975
976 void RenderStyle::addCursor(RefPtr<StyleImage>&& image, const IntPoint& hotSpot)
977 {
978     auto& cursorData = m_rareInheritedData.access().cursorData;
979     if (!cursorData)
980         cursorData = CursorList::create();
981     cursorData->append(CursorData(WTFMove(image), hotSpot));
982 }
983
984 void RenderStyle::setCursorList(RefPtr<CursorList>&& list)
985 {
986     m_rareInheritedData.access().cursorData = WTFMove(list);
987 }
988
989 void RenderStyle::setQuotes(RefPtr<QuotesData>&& q)
990 {
991     if (m_rareInheritedData->quotes == q || (m_rareInheritedData->quotes && q && *m_rareInheritedData->quotes == *q))
992         return;
993
994     m_rareInheritedData.access().quotes = WTFMove(q);
995 }
996
997 void RenderStyle::setWillChange(RefPtr<WillChangeData>&& willChangeData)
998 {
999     if (arePointingToEqualData(m_rareNonInheritedData->willChange.get(), willChangeData.get()))
1000         return;
1001
1002     m_rareNonInheritedData.access().willChange = WTFMove(willChangeData);
1003 }
1004
1005 void RenderStyle::clearCursorList()
1006 {
1007     if (m_rareInheritedData->cursorData)
1008         m_rareInheritedData.access().cursorData = nullptr;
1009 }
1010
1011 void RenderStyle::clearContent()
1012 {
1013     if (m_rareNonInheritedData->content)
1014         m_rareNonInheritedData.access().content = nullptr;
1015 }
1016
1017 static inline ContentData& lastContent(ContentData& firstContent)
1018 {
1019     auto* lastContent = &firstContent;
1020     for (auto* content = &firstContent; content; content = content->next())
1021         lastContent = content;
1022     return *lastContent;
1023 }
1024
1025 void RenderStyle::setContent(std::unique_ptr<ContentData> contentData, bool add)
1026 {
1027     auto& data = m_rareNonInheritedData.access();
1028     if (add && data.content)
1029         lastContent(*data.content).setNext(WTFMove(contentData));
1030     else {
1031         data.content = WTFMove(contentData);
1032         auto& altText = data.altText;
1033         if (!altText.isNull())
1034             data.content->setAltText(altText);
1035     }
1036 }
1037
1038 void RenderStyle::setContent(RefPtr<StyleImage>&& image, bool add)
1039 {
1040     if (!image)
1041         return;
1042     setContent(std::make_unique<ImageContentData>(image.releaseNonNull()), add);
1043 }
1044
1045 void RenderStyle::setContent(const String& string, bool add)
1046 {
1047     auto& data = m_rareNonInheritedData.access();
1048     if (add && data.content) {
1049         auto& last = lastContent(*data.content);
1050         if (!is<TextContentData>(last))
1051             last.setNext(std::make_unique<TextContentData>(string));
1052         else {
1053             auto& textContent = downcast<TextContentData>(last);
1054             textContent.setText(textContent.text() + string);
1055         }
1056     } else {
1057         data.content = std::make_unique<TextContentData>(string);
1058         auto& altText = data.altText;
1059         if (!altText.isNull())
1060             data.content->setAltText(altText);
1061     }
1062 }
1063
1064 void RenderStyle::setContent(std::unique_ptr<CounterContent> counter, bool add)
1065 {
1066     if (!counter)
1067         return;
1068     setContent(std::make_unique<CounterContentData>(WTFMove(counter)), add);
1069 }
1070
1071 void RenderStyle::setContent(QuoteType quote, bool add)
1072 {
1073     setContent(std::make_unique<QuoteContentData>(quote), add);
1074 }
1075
1076 void RenderStyle::setContentAltText(const String& string)
1077 {
1078     auto& data = m_rareNonInheritedData.access();
1079     data.altText = string;
1080     if (data.content)
1081         data.content->setAltText(string);
1082 }
1083
1084 const String& RenderStyle::contentAltText() const
1085 {
1086     return m_rareNonInheritedData->altText;
1087 }
1088
1089 void RenderStyle::setHasAttrContent()
1090 {
1091     setUnique();
1092     SET_VAR(m_rareNonInheritedData, hasAttrContent, true);
1093 }
1094
1095 static inline bool requireTransformOrigin(const Vector<RefPtr<TransformOperation>>& transformOperations, RenderStyle::ApplyTransformOrigin applyOrigin)
1096 {
1097     // The transform-origin property brackets the transform with translate operations.
1098     // When the only transform is a translation, the transform-origin is irrelevant.
1099
1100     if (applyOrigin != RenderStyle::IncludeTransformOrigin)
1101         return false;
1102
1103     for (auto& operation : transformOperations) {
1104         // FIXME: Use affectedByTransformOrigin().
1105         auto type = operation->type();
1106         if (type != TransformOperation::TRANSLATE
1107             && type != TransformOperation::TRANSLATE_3D
1108             && type != TransformOperation::TRANSLATE_X
1109             && type != TransformOperation::TRANSLATE_Y
1110             && type != TransformOperation::TRANSLATE_Z)
1111             return true;
1112     }
1113
1114     return false;
1115 }
1116
1117 void RenderStyle::applyTransform(TransformationMatrix& transform, const FloatRect& boundingBox, ApplyTransformOrigin applyOrigin) const
1118 {
1119     auto& operations = m_rareNonInheritedData->transform->operations.operations();
1120     bool applyTransformOrigin = requireTransformOrigin(operations, applyOrigin);
1121
1122     float offsetX = transformOriginX().isPercent() ? boundingBox.x() : 0;
1123     float offsetY = transformOriginY().isPercent() ? boundingBox.y() : 0;
1124
1125     if (applyTransformOrigin) {
1126         transform.translate3d(floatValueForLength(transformOriginX(), boundingBox.width()) + offsetX,
1127                               floatValueForLength(transformOriginY(), boundingBox.height()) + offsetY,
1128                               transformOriginZ());
1129     }
1130
1131     for (auto& operation : operations)
1132         operation->apply(transform, boundingBox.size());
1133
1134     if (applyTransformOrigin) {
1135         transform.translate3d(-floatValueForLength(transformOriginX(), boundingBox.width()) - offsetX,
1136                               -floatValueForLength(transformOriginY(), boundingBox.height()) - offsetY,
1137                               -transformOriginZ());
1138     }
1139 }
1140
1141 void RenderStyle::setPageScaleTransform(float scale)
1142 {
1143     if (scale == 1)
1144         return;
1145     TransformOperations transform;
1146     transform.operations().append(ScaleTransformOperation::create(scale, scale, ScaleTransformOperation::SCALE));
1147     setTransform(transform);
1148     setTransformOriginX(Length(0, Fixed));
1149     setTransformOriginY(Length(0, Fixed));
1150 }
1151
1152 void RenderStyle::setTextShadow(std::unique_ptr<ShadowData> shadowData, bool add)
1153 {
1154     ASSERT(!shadowData || (!shadowData->spread() && shadowData->style() == Normal));
1155
1156     auto& rareData = m_rareInheritedData.access();
1157     if (!add) {
1158         rareData.textShadow = WTFMove(shadowData);
1159         return;
1160     }
1161
1162     shadowData->setNext(WTFMove(rareData.textShadow));
1163     rareData.textShadow = WTFMove(shadowData);
1164 }
1165
1166 void RenderStyle::setBoxShadow(std::unique_ptr<ShadowData> shadowData, bool add)
1167 {
1168     auto& rareData = m_rareNonInheritedData.access();
1169     if (!add) {
1170         rareData.boxShadow = WTFMove(shadowData);
1171         return;
1172     }
1173
1174     shadowData->setNext(WTFMove(rareData.boxShadow));
1175     rareData.boxShadow = WTFMove(shadowData);
1176 }
1177
1178 static RoundedRect::Radii calcRadiiFor(const BorderData& border, const LayoutSize& size)
1179 {
1180     return {
1181         sizeForLengthSize(border.topLeft(), size),
1182         sizeForLengthSize(border.topRight(), size),
1183         sizeForLengthSize(border.bottomLeft(), size),
1184         sizeForLengthSize(border.bottomRight(), size)
1185     };
1186 }
1187
1188 StyleImage* RenderStyle::listStyleImage() const { return m_rareInheritedData->listStyleImage.get(); }
1189
1190 void RenderStyle::setListStyleImage(RefPtr<StyleImage>&& v)
1191 {
1192     if (m_rareInheritedData->listStyleImage != v)
1193         m_rareInheritedData.access().listStyleImage = WTFMove(v);
1194 }
1195
1196 const Color& RenderStyle::color() const
1197 {
1198     return m_inheritedData->color;
1199 }
1200
1201 const Color& RenderStyle::visitedLinkColor() const
1202 {
1203     return m_inheritedData->visitedLinkColor;
1204 }
1205
1206 void RenderStyle::setColor(const Color& v)
1207 {
1208     SET_VAR(m_inheritedData, color, v);
1209 }
1210
1211 void RenderStyle::setVisitedLinkColor(const Color& v)
1212 {
1213     SET_VAR(m_inheritedData, visitedLinkColor, v);
1214 }
1215
1216 float RenderStyle::horizontalBorderSpacing() const
1217 {
1218     return m_inheritedData->horizontalBorderSpacing;
1219 }
1220
1221 float RenderStyle::verticalBorderSpacing() const
1222 {
1223     return m_inheritedData->verticalBorderSpacing;
1224 }
1225
1226 void RenderStyle::setHorizontalBorderSpacing(float v)
1227 {
1228     SET_VAR(m_inheritedData, horizontalBorderSpacing, v);
1229 }
1230
1231 void RenderStyle::setVerticalBorderSpacing(float v)
1232 {
1233     SET_VAR(m_inheritedData, verticalBorderSpacing, v);
1234 }
1235
1236 RoundedRect RenderStyle::getRoundedBorderFor(const LayoutRect& borderRect, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
1237 {
1238     RoundedRect roundedRect(borderRect);
1239     if (hasBorderRadius()) {
1240         RoundedRect::Radii radii = calcRadiiFor(m_surroundData->border, borderRect.size());
1241         radii.scale(calcBorderRadiiConstraintScaleFor(borderRect, radii));
1242         roundedRect.includeLogicalEdges(radii, isHorizontalWritingMode(), includeLogicalLeftEdge, includeLogicalRightEdge);
1243     }
1244     return roundedRect;
1245 }
1246
1247 RoundedRect RenderStyle::getRoundedInnerBorderFor(const LayoutRect& borderRect, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
1248 {
1249     bool horizontal = isHorizontalWritingMode();
1250     auto leftWidth = (!horizontal || includeLogicalLeftEdge) ? borderLeftWidth() : 0;
1251     auto rightWidth = (!horizontal || includeLogicalRightEdge) ? borderRightWidth() : 0;
1252     auto topWidth = (horizontal || includeLogicalLeftEdge) ? borderTopWidth() : 0;
1253     auto bottomWidth = (horizontal || includeLogicalRightEdge) ? borderBottomWidth() : 0;
1254     return getRoundedInnerBorderFor(borderRect, topWidth, bottomWidth, leftWidth, rightWidth, includeLogicalLeftEdge, includeLogicalRightEdge);
1255 }
1256
1257 RoundedRect RenderStyle::getRoundedInnerBorderFor(const LayoutRect& borderRect, LayoutUnit topWidth, LayoutUnit bottomWidth,
1258     LayoutUnit leftWidth, LayoutUnit rightWidth, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
1259 {
1260     RoundedRect roundedRect { { borderRect.x() + leftWidth, borderRect.y() + topWidth,
1261         borderRect.width() - leftWidth - rightWidth, borderRect.height() - topWidth - bottomWidth } };
1262     if (hasBorderRadius()) {
1263         auto radii = getRoundedBorderFor(borderRect).radii();
1264         radii.shrink(topWidth, bottomWidth, leftWidth, rightWidth);
1265         roundedRect.includeLogicalEdges(radii, isHorizontalWritingMode(), includeLogicalLeftEdge, includeLogicalRightEdge);
1266     }
1267     return roundedRect;
1268 }
1269
1270 static bool allLayersAreFixed(const FillLayer& layers)
1271 {
1272     for (auto* layer = &layers; layer; layer = layer->next()) {
1273         if (!(layer->image() && layer->attachment() == FixedBackgroundAttachment))
1274             return false;
1275     }
1276     return true;
1277 }
1278
1279 bool RenderStyle::hasEntirelyFixedBackground() const
1280 {
1281     return allLayersAreFixed(backgroundLayers());
1282 }
1283
1284 const CounterDirectiveMap* RenderStyle::counterDirectives() const
1285 {
1286     return m_rareNonInheritedData->counterDirectives.get();
1287 }
1288
1289 CounterDirectiveMap& RenderStyle::accessCounterDirectives()
1290 {
1291     auto& map = m_rareNonInheritedData.access().counterDirectives;
1292     if (!map)
1293         map = std::make_unique<CounterDirectiveMap>();
1294     return *map;
1295 }
1296
1297 const CounterDirectives RenderStyle::getCounterDirectives(const AtomicString& identifier) const
1298 {
1299     if (const CounterDirectiveMap* directives = counterDirectives())
1300         return directives->get(identifier);
1301     return CounterDirectives();
1302 }
1303
1304 const AtomicString& RenderStyle::hyphenString() const
1305 {
1306     ASSERT(hyphens() != HyphensNone);
1307
1308     auto& hyphenationString = m_rareInheritedData->hyphenationString;
1309     if (!hyphenationString.isNull())
1310         return hyphenationString;
1311
1312     // FIXME: This should depend on locale.
1313     static NeverDestroyed<AtomicString> hyphenMinusString(&hyphenMinus, 1);
1314     static NeverDestroyed<AtomicString> hyphenString(&hyphen, 1);
1315     return fontCascade().primaryFont().glyphForCharacter(hyphen) ? hyphenString : hyphenMinusString;
1316 }
1317
1318 const AtomicString& RenderStyle::textEmphasisMarkString() const
1319 {
1320     switch (textEmphasisMark()) {
1321     case TextEmphasisMarkNone:
1322         return nullAtom;
1323     case TextEmphasisMarkCustom:
1324         return textEmphasisCustomMark();
1325     case TextEmphasisMarkDot: {
1326         static NeverDestroyed<AtomicString> filledDotString(&bullet, 1);
1327         static NeverDestroyed<AtomicString> openDotString(&whiteBullet, 1);
1328         return textEmphasisFill() == TextEmphasisFillFilled ? filledDotString : openDotString;
1329     }
1330     case TextEmphasisMarkCircle: {
1331         static NeverDestroyed<AtomicString> filledCircleString(&blackCircle, 1);
1332         static NeverDestroyed<AtomicString> openCircleString(&whiteCircle, 1);
1333         return textEmphasisFill() == TextEmphasisFillFilled ? filledCircleString : openCircleString;
1334     }
1335     case TextEmphasisMarkDoubleCircle: {
1336         static NeverDestroyed<AtomicString> filledDoubleCircleString(&fisheye, 1);
1337         static NeverDestroyed<AtomicString> openDoubleCircleString(&bullseye, 1);
1338         return textEmphasisFill() == TextEmphasisFillFilled ? filledDoubleCircleString : openDoubleCircleString;
1339     }
1340     case TextEmphasisMarkTriangle: {
1341         static NeverDestroyed<AtomicString> filledTriangleString(&blackUpPointingTriangle, 1);
1342         static NeverDestroyed<AtomicString> openTriangleString(&whiteUpPointingTriangle, 1);
1343         return textEmphasisFill() == TextEmphasisFillFilled ? filledTriangleString : openTriangleString;
1344     }
1345     case TextEmphasisMarkSesame: {
1346         static NeverDestroyed<AtomicString> filledSesameString(&sesameDot, 1);
1347         static NeverDestroyed<AtomicString> openSesameString(&whiteSesameDot, 1);
1348         return textEmphasisFill() == TextEmphasisFillFilled ? filledSesameString : openSesameString;
1349     }
1350     case TextEmphasisMarkAuto:
1351         ASSERT_NOT_REACHED();
1352         return nullAtom;
1353     }
1354
1355     ASSERT_NOT_REACHED();
1356     return nullAtom;
1357 }
1358
1359 #if ENABLE(DASHBOARD_SUPPORT)
1360
1361 const Vector<StyleDashboardRegion>& RenderStyle::initialDashboardRegions()
1362 {
1363     static NeverDestroyed<Vector<StyleDashboardRegion>> emptyList;
1364     return emptyList;
1365 }
1366
1367 const Vector<StyleDashboardRegion>& RenderStyle::noneDashboardRegions()
1368 {
1369     static NeverDestroyed<Vector<StyleDashboardRegion>> noneList;
1370     static bool noneListInitialized = false;
1371     if (!noneListInitialized) {
1372         noneList.get().append(StyleDashboardRegion { emptyString(), { }, StyleDashboardRegion::None });
1373         noneListInitialized = true;
1374     }
1375     return noneList;
1376 }
1377
1378 #endif
1379
1380 void RenderStyle::adjustAnimations()
1381 {
1382     auto* animationList = m_rareNonInheritedData->animations.get();
1383     if (!animationList)
1384         return;
1385
1386     // Get rid of empty animations and anything beyond them
1387     for (size_t i = 0, size = animationList->size(); i < size; ++i) {
1388         if (animationList->animation(i).isEmpty()) {
1389             animationList->resize(i);
1390             break;
1391         }
1392     }
1393
1394     if (animationList->isEmpty()) {
1395         clearAnimations();
1396         return;
1397     }
1398
1399     // Repeat patterns into layers that don't have some properties set.
1400     animationList->fillUnsetProperties();
1401 }
1402
1403 void RenderStyle::adjustTransitions()
1404 {
1405     auto* transitionList = m_rareNonInheritedData->transitions.get();
1406     if (!transitionList)
1407         return;
1408
1409     // Get rid of empty transitions and anything beyond them
1410     for (size_t i = 0, size = transitionList->size(); i < size; ++i) {
1411         if (transitionList->animation(i).isEmpty()) {
1412             transitionList->resize(i);
1413             break;
1414         }
1415     }
1416
1417     if (transitionList->isEmpty()) {
1418         clearTransitions();
1419         return;
1420     }
1421
1422     // Repeat patterns into layers that don't have some properties set.
1423     transitionList->fillUnsetProperties();
1424
1425     // Make sure there are no duplicate properties.
1426     // This is an O(n^2) algorithm but the lists tend to be short, so it is probably OK.
1427     for (size_t i = 0; i < transitionList->size(); ++i) {
1428         for (size_t j = i + 1; j < transitionList->size(); ++j) {
1429             if (transitionList->animation(i).property() == transitionList->animation(j).property()) {
1430                 // toss i
1431                 transitionList->remove(i);
1432                 j = i;
1433             }
1434         }
1435     }
1436 }
1437
1438 AnimationList& RenderStyle::ensureAnimations()
1439 {
1440     if (!m_rareNonInheritedData.access().animations)
1441         m_rareNonInheritedData.access().animations = std::make_unique<AnimationList>();
1442     return *m_rareNonInheritedData->animations;
1443 }
1444
1445 AnimationList& RenderStyle::ensureTransitions()
1446 {
1447     if (!m_rareNonInheritedData.access().transitions)
1448         m_rareNonInheritedData.access().transitions = std::make_unique<AnimationList>();
1449     return *m_rareNonInheritedData->transitions;
1450 }
1451
1452 const Animation* RenderStyle::transitionForProperty(CSSPropertyID property) const
1453 {
1454     auto* transitions = this->transitions();
1455     if (!transitions)
1456         return nullptr;
1457     for (size_t i = 0, size = transitions->size(); i < size; ++i) {
1458         auto& animation = transitions->animation(i);
1459         if (animation.animationMode() == Animation::AnimateAll || animation.property() == property)
1460             return &animation;
1461     }
1462     return nullptr;
1463 }
1464
1465 const FontCascade& RenderStyle::fontCascade() const
1466 {
1467     return m_inheritedData->fontCascade;
1468 }
1469
1470 const FontMetrics& RenderStyle::fontMetrics() const
1471 {
1472     return m_inheritedData->fontCascade.fontMetrics();
1473 }
1474
1475 const FontCascadeDescription& RenderStyle::fontDescription() const
1476 {
1477     return m_inheritedData->fontCascade.fontDescription();
1478 }
1479
1480 float RenderStyle::specifiedFontSize() const
1481 {
1482     return fontDescription().specifiedSize();
1483 }
1484
1485 float RenderStyle::computedFontSize() const
1486 {
1487     return fontDescription().computedSize();
1488 }
1489
1490 int RenderStyle::fontSize() const
1491 {
1492     return m_inheritedData->fontCascade.pixelSize();
1493 }
1494
1495 const Length& RenderStyle::wordSpacing() const
1496 {
1497     return m_rareInheritedData->wordSpacing;
1498 }
1499
1500 float RenderStyle::letterSpacing() const
1501 {
1502     return m_inheritedData->fontCascade.letterSpacing();
1503 }
1504
1505 bool RenderStyle::setFontDescription(const FontCascadeDescription& description)
1506 {
1507     if (m_inheritedData->fontCascade.fontDescription() == description)
1508         return false;
1509     auto& cascade = m_inheritedData.access().fontCascade;
1510     cascade = { description, cascade.letterSpacing(), cascade.wordSpacing() };
1511     return true;
1512 }
1513
1514 const Length& RenderStyle::specifiedLineHeight() const
1515 {
1516 #if ENABLE(TEXT_AUTOSIZING)
1517     return m_inheritedData->specifiedLineHeight;
1518 #else
1519     return m_inheritedData->lineHeight;
1520 #endif
1521 }
1522
1523 #if ENABLE(TEXT_AUTOSIZING)
1524
1525 void RenderStyle::setSpecifiedLineHeight(Length&& height)
1526 {
1527     SET_VAR(m_inheritedData, specifiedLineHeight, WTFMove(height));
1528 }
1529
1530 #endif
1531
1532 const Length& RenderStyle::lineHeight() const
1533 {
1534     return m_inheritedData->lineHeight;
1535 }
1536
1537 void RenderStyle::setLineHeight(Length&& height)
1538 {
1539     SET_VAR(m_inheritedData, lineHeight, WTFMove(height));
1540 }
1541
1542 int RenderStyle::computedLineHeight() const
1543 {
1544     const Length& lh = lineHeight();
1545
1546     // Negative value means the line height is not set. Use the font's built-in spacing.
1547     if (lh.isNegative())
1548         return fontMetrics().lineSpacing();
1549
1550     if (lh.isPercentOrCalculated())
1551         return minimumValueForLength(lh, fontSize());
1552
1553     return clampTo<int>(lh.value());
1554 }
1555
1556 void RenderStyle::setWordSpacing(Length&& value)
1557 {
1558     float fontWordSpacing;
1559     switch (value.type()) {
1560     case Auto:
1561         fontWordSpacing = 0;
1562         break;
1563     case Percent:
1564         fontWordSpacing = value.percent() * fontCascade().spaceWidth() / 100;
1565         break;
1566     case Fixed:
1567         fontWordSpacing = value.value();
1568         break;
1569     case Calculated:
1570         fontWordSpacing = value.nonNanCalculatedValue(maxValueForCssLength);
1571         break;
1572     default:
1573         ASSERT_NOT_REACHED();
1574         fontWordSpacing = 0;
1575         break;
1576     }
1577     m_inheritedData.access().fontCascade.setWordSpacing(fontWordSpacing);
1578     m_rareInheritedData.access().wordSpacing = WTFMove(value);
1579 }
1580
1581 void RenderStyle::setLetterSpacing(float v) { m_inheritedData.access().fontCascade.setLetterSpacing(v); }
1582
1583 void RenderStyle::setFontSize(float size)
1584 {
1585     // size must be specifiedSize if Text Autosizing is enabled, but computedSize if text
1586     // zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).
1587
1588     ASSERT(std::isfinite(size));
1589     if (!std::isfinite(size) || size < 0)
1590         size = 0;
1591     else
1592         size = std::min(maximumAllowedFontSize, size);
1593
1594     FontSelector* currentFontSelector = fontCascade().fontSelector();
1595     auto description = fontDescription();
1596     description.setSpecifiedSize(size);
1597     description.setComputedSize(size);
1598
1599     setFontDescription(description);
1600     fontCascade().update(currentFontSelector);
1601 }
1602
1603 #if ENABLE(VARIATION_FONTS)
1604 void RenderStyle::setFontVariationSettings(FontVariationSettings settings)
1605 {
1606     FontSelector* currentFontSelector = fontCascade().fontSelector();
1607     auto description = fontDescription();
1608     description.setVariationSettings(WTFMove(settings));
1609
1610     setFontDescription(description);
1611     fontCascade().update(currentFontSelector);
1612 }
1613 #endif
1614
1615 void RenderStyle::setFontWeight(FontSelectionValue value)
1616 {
1617     FontSelector* currentFontSelector = fontCascade().fontSelector();
1618     auto description = fontDescription();
1619     description.setWeight(value);
1620
1621     setFontDescription(description);
1622     fontCascade().update(currentFontSelector);
1623 }
1624
1625 void RenderStyle::setFontStretch(FontSelectionValue value)
1626 {
1627     FontSelector* currentFontSelector = fontCascade().fontSelector();
1628     auto description = fontDescription();
1629     description.setStretch(value);
1630
1631     setFontDescription(description);
1632     fontCascade().update(currentFontSelector);
1633 }
1634
1635 void RenderStyle::setFontItalic(FontSelectionValue value)
1636 {
1637     FontSelector* currentFontSelector = fontCascade().fontSelector();
1638     auto description = fontDescription();
1639     description.setItalic(value);
1640
1641     setFontDescription(description);
1642     fontCascade().update(currentFontSelector);
1643 }
1644
1645 void RenderStyle::getShadowExtent(const ShadowData* shadow, LayoutUnit& top, LayoutUnit& right, LayoutUnit& bottom, LayoutUnit& left) const
1646 {
1647     top = 0;
1648     right = 0;
1649     bottom = 0;
1650     left = 0;
1651
1652     for ( ; shadow; shadow = shadow->next()) {
1653         if (shadow->style() == Inset)
1654             continue;
1655
1656         int extentAndSpread = shadow->paintingExtent() + shadow->spread();
1657         top = std::min<LayoutUnit>(top, shadow->y() - extentAndSpread);
1658         right = std::max<LayoutUnit>(right, shadow->x() + extentAndSpread);
1659         bottom = std::max<LayoutUnit>(bottom, shadow->y() + extentAndSpread);
1660         left = std::min<LayoutUnit>(left, shadow->x() - extentAndSpread);
1661     }
1662 }
1663
1664 LayoutBoxExtent RenderStyle::getShadowInsetExtent(const ShadowData* shadow) const
1665 {
1666     LayoutUnit top = 0;
1667     LayoutUnit right = 0;
1668     LayoutUnit bottom = 0;
1669     LayoutUnit left = 0;
1670
1671     for ( ; shadow; shadow = shadow->next()) {
1672         if (shadow->style() == Normal)
1673             continue;
1674
1675         int extentAndSpread = shadow->paintingExtent() + shadow->spread();
1676         top = std::max<LayoutUnit>(top, shadow->y() + extentAndSpread);
1677         right = std::min<LayoutUnit>(right, shadow->x() - extentAndSpread);
1678         bottom = std::min<LayoutUnit>(bottom, shadow->y() - extentAndSpread);
1679         left = std::max<LayoutUnit>(left, shadow->x() + extentAndSpread);
1680     }
1681
1682     return LayoutBoxExtent(top, right, bottom, left);
1683 }
1684
1685 void RenderStyle::getShadowHorizontalExtent(const ShadowData* shadow, LayoutUnit &left, LayoutUnit &right) const
1686 {
1687     left = 0;
1688     right = 0;
1689
1690     for ( ; shadow; shadow = shadow->next()) {
1691         if (shadow->style() == Inset)
1692             continue;
1693
1694         int extentAndSpread = shadow->paintingExtent() + shadow->spread();
1695         left = std::min<LayoutUnit>(left, shadow->x() - extentAndSpread);
1696         right = std::max<LayoutUnit>(right, shadow->x() + extentAndSpread);
1697     }
1698 }
1699
1700 void RenderStyle::getShadowVerticalExtent(const ShadowData* shadow, LayoutUnit &top, LayoutUnit &bottom) const
1701 {
1702     top = 0;
1703     bottom = 0;
1704
1705     for ( ; shadow; shadow = shadow->next()) {
1706         if (shadow->style() == Inset)
1707             continue;
1708
1709         int extentAndSpread = shadow->paintingExtent() + shadow->spread();
1710         top = std::min<LayoutUnit>(top, shadow->y() - extentAndSpread);
1711         bottom = std::max<LayoutUnit>(bottom, shadow->y() + extentAndSpread);
1712     }
1713 }
1714
1715 Color RenderStyle::colorIncludingFallback(int colorProperty, bool visitedLink) const
1716 {
1717     Color result;
1718     EBorderStyle borderStyle = BNONE;
1719     switch (colorProperty) {
1720     case CSSPropertyBackgroundColor:
1721         return visitedLink ? visitedLinkBackgroundColor() : backgroundColor(); // Background color doesn't fall back.
1722     case CSSPropertyBorderLeftColor:
1723         result = visitedLink ? visitedLinkBorderLeftColor() : borderLeftColor();
1724         borderStyle = borderLeftStyle();
1725         break;
1726     case CSSPropertyBorderRightColor:
1727         result = visitedLink ? visitedLinkBorderRightColor() : borderRightColor();
1728         borderStyle = borderRightStyle();
1729         break;
1730     case CSSPropertyBorderTopColor:
1731         result = visitedLink ? visitedLinkBorderTopColor() : borderTopColor();
1732         borderStyle = borderTopStyle();
1733         break;
1734     case CSSPropertyBorderBottomColor:
1735         result = visitedLink ? visitedLinkBorderBottomColor() : borderBottomColor();
1736         borderStyle = borderBottomStyle();
1737         break;
1738     case CSSPropertyColor:
1739         result = visitedLink ? visitedLinkColor() : color();
1740         break;
1741     case CSSPropertyOutlineColor:
1742         result = visitedLink ? visitedLinkOutlineColor() : outlineColor();
1743         break;
1744     case CSSPropertyColumnRuleColor:
1745         result = visitedLink ? visitedLinkColumnRuleColor() : columnRuleColor();
1746         break;
1747     case CSSPropertyWebkitTextDecorationColor:
1748         // Text decoration color fallback is handled in RenderObject::decorationColor.
1749         return visitedLink ? visitedLinkTextDecorationColor() : textDecorationColor();
1750     case CSSPropertyWebkitTextEmphasisColor:
1751         result = visitedLink ? visitedLinkTextEmphasisColor() : textEmphasisColor();
1752         break;
1753     case CSSPropertyWebkitTextFillColor:
1754         result = visitedLink ? visitedLinkTextFillColor() : textFillColor();
1755         break;
1756     case CSSPropertyWebkitTextStrokeColor:
1757         result = visitedLink ? visitedLinkTextStrokeColor() : textStrokeColor();
1758         break;
1759     case CSSPropertyStrokeColor:
1760         result = visitedLink ? visitedLinkStrokeColor() : strokeColor();
1761         break;
1762     default:
1763         ASSERT_NOT_REACHED();
1764         break;
1765     }
1766
1767     if (!result.isValid()) {
1768         if (!visitedLink && (borderStyle == INSET || borderStyle == OUTSET || borderStyle == RIDGE || borderStyle == GROOVE))
1769             result = Color(238, 238, 238);
1770         else
1771             result = visitedLink ? visitedLinkColor() : color();
1772     }
1773     return result;
1774 }
1775
1776 Color RenderStyle::visitedDependentColor(int colorProperty) const
1777 {
1778     Color unvisitedColor = colorIncludingFallback(colorProperty, false);
1779     if (insideLink() != InsideVisitedLink)
1780         return unvisitedColor;
1781
1782     Color visitedColor = colorIncludingFallback(colorProperty, true);
1783
1784     // Text decoration color validity is preserved (checked in RenderObject::decorationColor).
1785     if (colorProperty == CSSPropertyWebkitTextDecorationColor)
1786         return visitedColor;
1787
1788     // FIXME: Technically someone could explicitly specify the color transparent, but for now we'll just
1789     // assume that if the background color is transparent that it wasn't set. Note that it's weird that
1790     // we're returning unvisited info for a visited link, but given our restriction that the alpha values
1791     // have to match, it makes more sense to return the unvisited background color if specified than it
1792     // does to return black. This behavior matches what Firefox 4 does as well.
1793     if (colorProperty == CSSPropertyBackgroundColor && visitedColor == Color::transparent)
1794         return unvisitedColor;
1795
1796     // Take the alpha from the unvisited color, but get the RGB values from the visited color.
1797     return visitedColor.colorWithAlpha(unvisitedColor.alphaAsFloat());
1798 }
1799
1800 const BorderValue& RenderStyle::borderBefore() const
1801 {
1802     switch (writingMode()) {
1803     case TopToBottomWritingMode:
1804         return borderTop();
1805     case BottomToTopWritingMode:
1806         return borderBottom();
1807     case LeftToRightWritingMode:
1808         return borderLeft();
1809     case RightToLeftWritingMode:
1810         return borderRight();
1811     }
1812     ASSERT_NOT_REACHED();
1813     return borderTop();
1814 }
1815
1816 const BorderValue& RenderStyle::borderAfter() const
1817 {
1818     switch (writingMode()) {
1819     case TopToBottomWritingMode:
1820         return borderBottom();
1821     case BottomToTopWritingMode:
1822         return borderTop();
1823     case LeftToRightWritingMode:
1824         return borderRight();
1825     case RightToLeftWritingMode:
1826         return borderLeft();
1827     }
1828     ASSERT_NOT_REACHED();
1829     return borderBottom();
1830 }
1831
1832 const BorderValue& RenderStyle::borderStart() const
1833 {
1834     if (isHorizontalWritingMode())
1835         return isLeftToRightDirection() ? borderLeft() : borderRight();
1836     return isLeftToRightDirection() ? borderTop() : borderBottom();
1837 }
1838
1839 const BorderValue& RenderStyle::borderEnd() const
1840 {
1841     if (isHorizontalWritingMode())
1842         return isLeftToRightDirection() ? borderRight() : borderLeft();
1843     return isLeftToRightDirection() ? borderBottom() : borderTop();
1844 }
1845
1846 float RenderStyle::borderBeforeWidth() const
1847 {
1848     switch (writingMode()) {
1849     case TopToBottomWritingMode:
1850         return borderTopWidth();
1851     case BottomToTopWritingMode:
1852         return borderBottomWidth();
1853     case LeftToRightWritingMode:
1854         return borderLeftWidth();
1855     case RightToLeftWritingMode:
1856         return borderRightWidth();
1857     }
1858     ASSERT_NOT_REACHED();
1859     return borderTopWidth();
1860 }
1861
1862 float RenderStyle::borderAfterWidth() const
1863 {
1864     switch (writingMode()) {
1865     case TopToBottomWritingMode:
1866         return borderBottomWidth();
1867     case BottomToTopWritingMode:
1868         return borderTopWidth();
1869     case LeftToRightWritingMode:
1870         return borderRightWidth();
1871     case RightToLeftWritingMode:
1872         return borderLeftWidth();
1873     }
1874     ASSERT_NOT_REACHED();
1875     return borderBottomWidth();
1876 }
1877
1878 float RenderStyle::borderStartWidth() const
1879 {
1880     if (isHorizontalWritingMode())
1881         return isLeftToRightDirection() ? borderLeftWidth() : borderRightWidth();
1882     return isLeftToRightDirection() ? borderTopWidth() : borderBottomWidth();
1883 }
1884
1885 float RenderStyle::borderEndWidth() const
1886 {
1887     if (isHorizontalWritingMode())
1888         return isLeftToRightDirection() ? borderRightWidth() : borderLeftWidth();
1889     return isLeftToRightDirection() ? borderBottomWidth() : borderTopWidth();
1890 }
1891
1892 void RenderStyle::setMarginStart(Length&& margin)
1893 {
1894     if (isHorizontalWritingMode()) {
1895         if (isLeftToRightDirection())
1896             setMarginLeft(WTFMove(margin));
1897         else
1898             setMarginRight(WTFMove(margin));
1899     } else {
1900         if (isLeftToRightDirection())
1901             setMarginTop(WTFMove(margin));
1902         else
1903             setMarginBottom(WTFMove(margin));
1904     }
1905 }
1906
1907 void RenderStyle::setMarginEnd(Length&& margin)
1908 {
1909     if (isHorizontalWritingMode()) {
1910         if (isLeftToRightDirection())
1911             setMarginRight(WTFMove(margin));
1912         else
1913             setMarginLeft(WTFMove(margin));
1914     } else {
1915         if (isLeftToRightDirection())
1916             setMarginBottom(WTFMove(margin));
1917         else
1918             setMarginTop(WTFMove(margin));
1919     }
1920 }
1921
1922 TextEmphasisMark RenderStyle::textEmphasisMark() const
1923 {
1924     auto mark = static_cast<TextEmphasisMark>(m_rareInheritedData->textEmphasisMark);
1925     if (mark != TextEmphasisMarkAuto)
1926         return mark;
1927     if (isHorizontalWritingMode())
1928         return TextEmphasisMarkDot;
1929     return TextEmphasisMarkSesame;
1930 }
1931
1932 #if ENABLE(TOUCH_EVENTS)
1933
1934 Color RenderStyle::initialTapHighlightColor()
1935 {
1936     return RenderTheme::tapHighlightColor();
1937 }
1938
1939 #endif
1940
1941 LayoutBoxExtent RenderStyle::imageOutsets(const NinePieceImage& image) const
1942 {
1943     return LayoutBoxExtent(NinePieceImage::computeOutset(image.outset().top(), borderTopWidth()),
1944                            NinePieceImage::computeOutset(image.outset().right(), borderRightWidth()),
1945                            NinePieceImage::computeOutset(image.outset().bottom(), borderBottomWidth()),
1946                            NinePieceImage::computeOutset(image.outset().left(), borderLeftWidth()));
1947 }
1948
1949 std::pair<FontOrientation, NonCJKGlyphOrientation> RenderStyle::fontAndGlyphOrientation()
1950 {
1951     // FIXME: TextOrientationSideways should map to sideways-left in vertical-lr, which is not supported yet.
1952
1953     if (isHorizontalWritingMode())
1954         return { Horizontal, NonCJKGlyphOrientation::Mixed };
1955
1956     switch (textOrientation()) {
1957     case TextOrientation::Mixed:
1958         return { Vertical, NonCJKGlyphOrientation::Mixed };
1959     case TextOrientation::Upright:
1960         return { Vertical, NonCJKGlyphOrientation::Upright };
1961     case TextOrientation::Sideways:
1962         return { Horizontal, NonCJKGlyphOrientation::Mixed };
1963     default:
1964         ASSERT_NOT_REACHED();
1965         return { Horizontal, NonCJKGlyphOrientation::Mixed };
1966     }
1967 }
1968
1969 void RenderStyle::setBorderImageSource(RefPtr<StyleImage>&& image)
1970 {
1971     if (m_surroundData->border.m_image.image() == image.get())
1972         return;
1973     m_surroundData.access().border.m_image.setImage(WTFMove(image));
1974 }
1975
1976 void RenderStyle::setBorderImageSlices(LengthBox&& slices)
1977 {
1978     if (m_surroundData->border.m_image.imageSlices() == slices)
1979         return;
1980     m_surroundData.access().border.m_image.setImageSlices(WTFMove(slices));
1981 }
1982
1983 void RenderStyle::setBorderImageWidth(LengthBox&& slices)
1984 {
1985     if (m_surroundData->border.m_image.borderSlices() == slices)
1986         return;
1987     m_surroundData.access().border.m_image.setBorderSlices(WTFMove(slices));
1988 }
1989
1990 void RenderStyle::setBorderImageOutset(LengthBox&& outset)
1991 {
1992     if (m_surroundData->border.m_image.outset() == outset)
1993         return;
1994     m_surroundData.access().border.m_image.setOutset(WTFMove(outset));
1995 }
1996
1997 void RenderStyle::setColumnStylesFromPaginationMode(const Pagination::Mode& paginationMode)
1998 {
1999     if (paginationMode == Pagination::Unpaginated)
2000         return;
2001     
2002     setColumnFill(ColumnFillAuto);
2003     
2004     switch (paginationMode) {
2005     case Pagination::LeftToRightPaginated:
2006         setColumnAxis(HorizontalColumnAxis);
2007         if (isHorizontalWritingMode())
2008             setColumnProgression(isLeftToRightDirection() ? NormalColumnProgression : ReverseColumnProgression);
2009         else
2010             setColumnProgression(isFlippedBlocksWritingMode() ? ReverseColumnProgression : NormalColumnProgression);
2011         break;
2012     case Pagination::RightToLeftPaginated:
2013         setColumnAxis(HorizontalColumnAxis);
2014         if (isHorizontalWritingMode())
2015             setColumnProgression(isLeftToRightDirection() ? ReverseColumnProgression : NormalColumnProgression);
2016         else
2017             setColumnProgression(isFlippedBlocksWritingMode() ? NormalColumnProgression : ReverseColumnProgression);
2018         break;
2019     case Pagination::TopToBottomPaginated:
2020         setColumnAxis(VerticalColumnAxis);
2021         if (isHorizontalWritingMode())
2022             setColumnProgression(isFlippedBlocksWritingMode() ? ReverseColumnProgression : NormalColumnProgression);
2023         else
2024             setColumnProgression(isLeftToRightDirection() ? NormalColumnProgression : ReverseColumnProgression);
2025         break;
2026     case Pagination::BottomToTopPaginated:
2027         setColumnAxis(VerticalColumnAxis);
2028         if (isHorizontalWritingMode())
2029             setColumnProgression(isFlippedBlocksWritingMode() ? NormalColumnProgression : ReverseColumnProgression);
2030         else
2031             setColumnProgression(isLeftToRightDirection() ? ReverseColumnProgression : NormalColumnProgression);
2032         break;
2033     case Pagination::Unpaginated:
2034         ASSERT_NOT_REACHED();
2035         break;
2036     }
2037 }
2038
2039 #if ENABLE(CSS_SCROLL_SNAP)
2040
2041 ScrollSnapType RenderStyle::initialScrollSnapType()
2042 {
2043     return { };
2044 }
2045
2046 ScrollSnapAlign RenderStyle::initialScrollSnapAlign()
2047 {
2048     return { };
2049 }
2050
2051 const StyleScrollSnapArea& RenderStyle::scrollSnapArea() const
2052 {
2053     return *m_rareNonInheritedData->scrollSnapArea;
2054 }
2055
2056 const StyleScrollSnapPort& RenderStyle::scrollSnapPort() const
2057 {
2058     return *m_rareNonInheritedData->scrollSnapPort;
2059 }
2060
2061 const ScrollSnapType& RenderStyle::scrollSnapType() const
2062 {
2063     return m_rareNonInheritedData->scrollSnapPort->type;
2064 }
2065
2066 const LengthBox& RenderStyle::scrollPadding() const
2067 {
2068     return m_rareNonInheritedData->scrollSnapPort->scrollPadding;
2069 }
2070
2071 const Length& RenderStyle::scrollPaddingTop() const
2072 {
2073     return scrollPadding().top();
2074 }
2075
2076 const Length& RenderStyle::scrollPaddingBottom() const
2077 {
2078     return scrollPadding().bottom();
2079 }
2080
2081 const Length& RenderStyle::scrollPaddingLeft() const
2082 {
2083     return scrollPadding().left();
2084 }
2085
2086 const Length& RenderStyle::scrollPaddingRight() const
2087 {
2088     return scrollPadding().right();
2089 }
2090
2091 const ScrollSnapAlign& RenderStyle::scrollSnapAlign() const
2092 {
2093     return m_rareNonInheritedData->scrollSnapArea->alignment;
2094 }
2095
2096 const LengthBox& RenderStyle::scrollSnapMargin() const
2097 {
2098     return m_rareNonInheritedData->scrollSnapArea->scrollSnapMargin;
2099 }
2100
2101 const Length& RenderStyle::scrollSnapMarginTop() const
2102 {
2103     return scrollSnapMargin().top();
2104 }
2105
2106 const Length& RenderStyle::scrollSnapMarginBottom() const
2107 {
2108     return scrollSnapMargin().bottom();
2109 }
2110
2111 const Length& RenderStyle::scrollSnapMarginLeft() const
2112 {
2113     return scrollSnapMargin().left();
2114 }
2115
2116 const Length& RenderStyle::scrollSnapMarginRight() const
2117 {
2118     return scrollSnapMargin().right();
2119 }
2120
2121 void RenderStyle::setScrollSnapType(const ScrollSnapType& type)
2122 {
2123     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapPort, type, type);
2124 }
2125
2126 void RenderStyle::setScrollPaddingTop(Length&& length)
2127 {
2128     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapPort, scrollPadding.top(), WTFMove(length));
2129 }
2130
2131 void RenderStyle::setScrollPaddingBottom(Length&& length)
2132 {
2133     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapPort, scrollPadding.bottom(), WTFMove(length));
2134 }
2135
2136 void RenderStyle::setScrollPaddingLeft(Length&& length)
2137 {
2138     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapPort, scrollPadding.left(), WTFMove(length));
2139 }
2140
2141 void RenderStyle::setScrollPaddingRight(Length&& length)
2142 {
2143     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapPort, scrollPadding.right(), WTFMove(length));
2144 }
2145
2146 void RenderStyle::setScrollSnapAlign(const ScrollSnapAlign& alignment)
2147 {
2148     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapArea, alignment, alignment);
2149 }
2150
2151 void RenderStyle::setScrollSnapMarginTop(Length&& length)
2152 {
2153     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapArea, scrollSnapMargin.top(), WTFMove(length));
2154 }
2155
2156 void RenderStyle::setScrollSnapMarginBottom(Length&& length)
2157 {
2158     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapArea, scrollSnapMargin.bottom(), WTFMove(length));
2159 }
2160
2161 void RenderStyle::setScrollSnapMarginLeft(Length&& length)
2162 {
2163     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapArea, scrollSnapMargin.left(), WTFMove(length));
2164 }
2165
2166 void RenderStyle::setScrollSnapMarginRight(Length&& length)
2167 {
2168     SET_NESTED_VAR(m_rareNonInheritedData, scrollSnapArea, scrollSnapMargin.right(), WTFMove(length));
2169 }
2170
2171 #endif
2172
2173 bool RenderStyle::hasReferenceFilterOnly() const
2174 {
2175     if (!hasFilter())
2176         return false;
2177     auto& filterOperations = m_rareNonInheritedData->filter->operations;
2178     return filterOperations.size() == 1 && filterOperations.at(0)->type() == FilterOperation::REFERENCE;
2179 }
2180
2181 void RenderStyle::checkVariablesInCustomProperties()
2182 {
2183     if (!m_rareInheritedData->customProperties->containsVariables)
2184         return;
2185
2186     auto& customPropertyData = m_rareInheritedData.access().customProperties.access();
2187
2188     // Our first pass checks the variables for validity and replaces any properties that became
2189     // invalid with empty values.
2190     auto& customProperties = customPropertyData.values;
2191     HashSet<AtomicString> invalidProperties;
2192     for (auto entry : customProperties) {
2193         if (!entry.value->containsVariables())
2194             continue;
2195         HashSet<AtomicString> seenProperties;
2196         entry.value->checkVariablesForCycles(entry.key, customProperties, seenProperties, invalidProperties);
2197     }
2198     
2199     // Now insert invalid values.
2200     if (!invalidProperties.isEmpty()) {
2201         auto invalidValue = CSSCustomPropertyValue::createInvalid();
2202         for (auto& property : invalidProperties)
2203             customProperties.set(property, invalidValue.copyRef());
2204     }
2205
2206     // Now that all of the properties have been tested for validity and replaced with
2207     // invalid values if they failed, we can perform variable substitution on the valid values.
2208     Vector<Ref<CSSCustomPropertyValue>> resolvedValues;
2209     for (auto entry : customProperties) {
2210         if (!entry.value->containsVariables())
2211             continue;
2212         entry.value->resolveVariableReferences(customProperties, resolvedValues);
2213     }
2214     
2215     // With all results computed, we can now mutate our table to eliminate the variables and
2216     // hold the final values. This way when we inherit, we don't end up resubstituting variables, etc.
2217     for (auto& resolvedValue : resolvedValues)
2218         customProperties.set(resolvedValue->name(), resolvedValue.copyRef());
2219
2220     customPropertyData.containsVariables = false;
2221 }
2222
2223 float RenderStyle::outlineWidth() const
2224 {
2225     if (m_backgroundData->outline.style() == BNONE)
2226         return 0;
2227     if (outlineStyleIsAuto())
2228         return std::max(m_backgroundData->outline.width(), RenderTheme::platformFocusRingWidth());
2229     return m_backgroundData->outline.width();
2230 }
2231
2232 float RenderStyle::outlineOffset() const
2233 {
2234     if (m_backgroundData->outline.style() == BNONE)
2235         return 0;
2236     if (outlineStyleIsAuto())
2237         return (m_backgroundData->outline.offset() + RenderTheme::platformFocusRingOffset(outlineWidth()));
2238     return m_backgroundData->outline.offset();
2239 }
2240
2241 bool RenderStyle::shouldPlaceBlockDirectionScrollbarOnLeft() const
2242 {
2243     return !isLeftToRightDirection() && isHorizontalWritingMode();
2244 }
2245
2246 #if ENABLE(DASHBOARD_SUPPORT)
2247
2248 void RenderStyle::setDashboardRegion(int type, const String& label, Length&& top, Length&& right, Length&& bottom, Length&& left, bool append)
2249 {
2250     if (!append)
2251         m_rareNonInheritedData.access().dashboardRegions.clear();
2252     m_rareNonInheritedData.access().dashboardRegions.append({ label, { WTFMove(top), WTFMove(right), WTFMove(bottom), WTFMove(left) }, type });
2253 }
2254
2255 #endif
2256
2257 Vector<PaintType, 3> RenderStyle::paintTypesForPaintOrder(PaintOrder order)
2258 {
2259     Vector<PaintType, 3> paintOrder;
2260     switch (order) {
2261     case PaintOrder::Normal:
2262         FALLTHROUGH;
2263     case PaintOrder::Fill:
2264         paintOrder.append(PaintType::Fill);
2265         paintOrder.append(PaintType::Stroke);
2266         paintOrder.append(PaintType::Markers);
2267         break;
2268     case PaintOrder::FillMarkers:
2269         paintOrder.append(PaintType::Fill);
2270         paintOrder.append(PaintType::Markers);
2271         paintOrder.append(PaintType::Stroke);
2272         break;
2273     case PaintOrder::Stroke:
2274         paintOrder.append(PaintType::Stroke);
2275         paintOrder.append(PaintType::Fill);
2276         paintOrder.append(PaintType::Markers);
2277         break;
2278     case PaintOrder::StrokeMarkers:
2279         paintOrder.append(PaintType::Stroke);
2280         paintOrder.append(PaintType::Markers);
2281         paintOrder.append(PaintType::Fill);
2282         break;
2283     case PaintOrder::Markers:
2284         paintOrder.append(PaintType::Markers);
2285         paintOrder.append(PaintType::Fill);
2286         paintOrder.append(PaintType::Stroke);
2287         break;
2288     case PaintOrder::MarkersStroke:
2289         paintOrder.append(PaintType::Markers);
2290         paintOrder.append(PaintType::Stroke);
2291         paintOrder.append(PaintType::Fill);
2292         break;
2293     };
2294     return paintOrder;
2295 }
2296
2297 float RenderStyle::computedStrokeWidth(const IntSize& viewportSize) const
2298 {
2299     if (!hasExplicitlySetStrokeWidth())
2300         return textStrokeWidth();
2301     
2302     const Length& length = strokeWidth();
2303
2304     if (length.isPercent()) {
2305         // According to the spec, https://drafts.fxtf.org/paint/#stroke-width, the percentage is relative to the scaled viewport size.
2306         // The scaled viewport size is the geometric mean of the viewport width and height.
2307         ExceptionOr<float> result = length.value() * (viewportSize.width() + viewportSize.height()) / 200.0f;
2308         if (result.hasException())
2309             return 0;
2310         return result.releaseReturnValue();
2311     }
2312     
2313     if (length.isAuto() || !length.isSpecified())
2314         return 0;
2315     
2316     return floatValueForLength(length, viewportSize.width());
2317 }
2318
2319 bool RenderStyle::hasPositiveStrokeWidth() const
2320 {
2321     if (!hasExplicitlySetStrokeWidth())
2322         return textStrokeWidth() > 0;
2323
2324     return strokeWidth().isPositive();
2325 }
2326
2327 } // namespace WebCore