1 /*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 1999 Antti Koivisto (koivisto@kde.org)
4 * (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
5 * (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
6 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25 #include "config.h"
26 #include "RenderBox.h"
27
28 #include "CachedImage.h"
29 #include "Chrome.h"
30 #include "ChromeClient.h"
31 #include "Document.h"
32 #include "FrameView.h"
33 #include "GraphicsContext.h"
34 #include "HitTestResult.h"
35 #include "htmlediting.h"
36 #include "HTMLElement.h"
37 #include "HTMLNames.h"
38 #include "ImageBuffer.h"
39 #include "FloatQuad.h"
40 #include "Frame.h"
41 #include "Page.h"
42 #include "PaintInfo.h"
43 #include "RenderArena.h"
44 #include "RenderFlexibleBox.h"
45 #include "RenderInline.h"
46 #include "RenderLayer.h"
47 #include "RenderTableCell.h"
48 #include "RenderTheme.h"
49 #include "RenderView.h"
50 #include "ScrollbarTheme.h"
51 #include "TransformState.h"
52 #include <algorithm>
53 #include <math.h>
54
55 using namespace std;
56
57 namespace WebCore {
58
59 using namespace HTMLNames;
60
61 // Used by flexible boxes when flexing this element.
62 typedef WTF::HashMap<const RenderBox*, int> OverrideSizeMap;
63 static OverrideSizeMap* gOverrideSizeMap = 0;
64
65 bool RenderBox::s_hadOverflowClip = false;
66
RenderBox(Node * node)67 RenderBox::RenderBox(Node* node)
68 : RenderBoxModelObject(node)
69 , m_marginLeft(0)
70 , m_marginRight(0)
71 , m_marginTop(0)
72 , m_marginBottom(0)
73 , m_minPreferredLogicalWidth(-1)
74 , m_maxPreferredLogicalWidth(-1)
75 , m_inlineBoxWrapper(0)
76 {
77 setIsBox();
78 }
79
~RenderBox()80 RenderBox::~RenderBox()
81 {
82 }
83
marginBefore() const84 int RenderBox::marginBefore() const
85 {
86 switch (style()->writingMode()) {
87 case TopToBottomWritingMode:
88 return m_marginTop;
89 case BottomToTopWritingMode:
90 return m_marginBottom;
91 case LeftToRightWritingMode:
92 return m_marginLeft;
93 case RightToLeftWritingMode:
94 return m_marginRight;
95 }
96 ASSERT_NOT_REACHED();
97 return m_marginTop;
98 }
99
marginAfter() const100 int RenderBox::marginAfter() const
101 {
102 switch (style()->writingMode()) {
103 case TopToBottomWritingMode:
104 return m_marginBottom;
105 case BottomToTopWritingMode:
106 return m_marginTop;
107 case LeftToRightWritingMode:
108 return m_marginRight;
109 case RightToLeftWritingMode:
110 return m_marginLeft;
111 }
112 ASSERT_NOT_REACHED();
113 return m_marginBottom;
114 }
115
marginStart() const116 int RenderBox::marginStart() const
117 {
118 if (isHorizontalWritingMode())
119 return style()->isLeftToRightDirection() ? m_marginLeft : m_marginRight;
120 return style()->isLeftToRightDirection() ? m_marginTop : m_marginBottom;
121 }
122
marginEnd() const123 int RenderBox::marginEnd() const
124 {
125 if (isHorizontalWritingMode())
126 return style()->isLeftToRightDirection() ? m_marginRight : m_marginLeft;
127 return style()->isLeftToRightDirection() ? m_marginBottom : m_marginTop;
128 }
129
setMarginStart(int margin)130 void RenderBox::setMarginStart(int margin)
131 {
132 if (isHorizontalWritingMode()) {
133 if (style()->isLeftToRightDirection())
134 m_marginLeft = margin;
135 else
136 m_marginRight = margin;
137 } else {
138 if (style()->isLeftToRightDirection())
139 m_marginTop = margin;
140 else
141 m_marginBottom = margin;
142 }
143 }
144
setMarginEnd(int margin)145 void RenderBox::setMarginEnd(int margin)
146 {
147 if (isHorizontalWritingMode()) {
148 if (style()->isLeftToRightDirection())
149 m_marginRight = margin;
150 else
151 m_marginLeft = margin;
152 } else {
153 if (style()->isLeftToRightDirection())
154 m_marginBottom = margin;
155 else
156 m_marginTop = margin;
157 }
158 }
159
setMarginBefore(int margin)160 void RenderBox::setMarginBefore(int margin)
161 {
162 switch (style()->writingMode()) {
163 case TopToBottomWritingMode:
164 m_marginTop = margin;
165 break;
166 case BottomToTopWritingMode:
167 m_marginBottom = margin;
168 break;
169 case LeftToRightWritingMode:
170 m_marginLeft = margin;
171 break;
172 case RightToLeftWritingMode:
173 m_marginRight = margin;
174 break;
175 }
176 }
177
setMarginAfter(int margin)178 void RenderBox::setMarginAfter(int margin)
179 {
180 switch (style()->writingMode()) {
181 case TopToBottomWritingMode:
182 m_marginBottom = margin;
183 break;
184 case BottomToTopWritingMode:
185 m_marginTop = margin;
186 break;
187 case LeftToRightWritingMode:
188 m_marginRight = margin;
189 break;
190 case RightToLeftWritingMode:
191 m_marginLeft = margin;
192 break;
193 }
194 }
195
destroy()196 void RenderBox::destroy()
197 {
198 // A lot of the code in this function is just pasted into
199 // RenderWidget::destroy. If anything in this function changes,
200 // be sure to fix RenderWidget::destroy() as well.
201 if (hasOverrideSize())
202 gOverrideSizeMap->remove(this);
203
204 if (style() && (style()->logicalHeight().isPercent() || style()->logicalMinHeight().isPercent() || style()->logicalMaxHeight().isPercent()))
205 RenderBlock::removePercentHeightDescendant(this);
206
207 // If this renderer is owning renderer for the frameview's custom scrollbars,
208 // we need to clear it from the scrollbar. See webkit bug 64737.
209 if (style() && style()->hasPseudoStyle(SCROLLBAR) && frame() && frame()->view())
210 frame()->view()->clearOwningRendererForCustomScrollbars(this);
211
212 RenderBoxModelObject::destroy();
213 }
214
removeFloatingOrPositionedChildFromBlockLists()215 void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
216 {
217 ASSERT(isFloatingOrPositioned());
218
219 if (documentBeingDestroyed())
220 return;
221
222 if (isFloating()) {
223 RenderBlock* parentBlock = 0;
224 for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
225 if (curr->isRenderBlock()) {
226 RenderBlock* currBlock = toRenderBlock(curr);
227 if (!parentBlock || currBlock->containsFloat(this))
228 parentBlock = currBlock;
229 }
230 }
231
232 if (parentBlock) {
233 RenderObject* parent = parentBlock->parent();
234 if (parent && parent->isFlexibleBox())
235 parentBlock = toRenderBlock(parent);
236
237 parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
238 }
239 }
240
241 if (isPositioned()) {
242 for (RenderObject* curr = parent(); curr; curr = curr->parent()) {
243 if (curr->isRenderBlock())
244 toRenderBlock(curr)->removePositionedObject(this);
245 }
246 }
247 }
248
styleWillChange(StyleDifference diff,const RenderStyle * newStyle)249 void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
250 {
251 s_hadOverflowClip = hasOverflowClip();
252
253 if (style()) {
254 // The background of the root element or the body element could propagate up to
255 // the canvas. Just dirty the entire canvas when our style changes substantially.
256 if (diff >= StyleDifferenceRepaint && node() &&
257 (node()->hasTagName(htmlTag) || node()->hasTagName(bodyTag)))
258 view()->repaint();
259
260 // When a layout hint happens and an object's position style changes, we have to do a layout
261 // to dirty the render tree using the old position value now.
262 if (diff == StyleDifferenceLayout && parent() && style()->position() != newStyle->position()) {
263 markContainingBlocksForLayout();
264 if (style()->position() == StaticPosition)
265 repaint();
266 else if (newStyle->position() == AbsolutePosition || newStyle->position() == FixedPosition)
267 parent()->setChildNeedsLayout(true);
268 if (isFloating() && !isPositioned() && (newStyle->position() == AbsolutePosition || newStyle->position() == FixedPosition))
269 removeFloatingOrPositionedChildFromBlockLists();
270 }
271 } else if (newStyle && isBody())
272 view()->repaint();
273
274 if (FrameView *frameView = view()->frameView()) {
275 bool newStyleIsFixed = newStyle && newStyle->position() == FixedPosition;
276 bool oldStyleIsFixed = style() && style()->position() == FixedPosition;
277 if (newStyleIsFixed != oldStyleIsFixed) {
278 if (newStyleIsFixed)
279 frameView->addFixedObject();
280 else
281 frameView->removeFixedObject();
282 }
283 }
284
285 RenderBoxModelObject::styleWillChange(diff, newStyle);
286 }
287
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)288 void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
289 {
290 RenderBoxModelObject::styleDidChange(diff, oldStyle);
291
292 if (needsLayout() && oldStyle) {
293 if (oldStyle && (oldStyle->logicalHeight().isPercent() || oldStyle->logicalMinHeight().isPercent() || oldStyle->logicalMaxHeight().isPercent()))
294 RenderBlock::removePercentHeightDescendant(this);
295
296 // Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
297 // when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
298 // to determine the new static position.
299 if (isPositioned() && style()->hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != style()->marginBefore()
300 && parent() && !parent()->normalChildNeedsLayout())
301 parent()->setChildNeedsLayout(true);
302 }
303
304 // If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
305 // new zoomed coordinate space.
306 if (hasOverflowClip() && oldStyle && style() && oldStyle->effectiveZoom() != style()->effectiveZoom()) {
307 if (int left = layer()->scrollXOffset()) {
308 left = (left / oldStyle->effectiveZoom()) * style()->effectiveZoom();
309 layer()->scrollToXOffset(left);
310 }
311 if (int top = layer()->scrollYOffset()) {
312 top = (top / oldStyle->effectiveZoom()) * style()->effectiveZoom();
313 layer()->scrollToYOffset(top);
314 }
315 }
316
317 bool isBodyRenderer = isBody();
318 bool isRootRenderer = isRoot();
319
320 // Set the text color if we're the body.
321 if (isBodyRenderer)
322 document()->setTextColor(style()->visitedDependentColor(CSSPropertyColor));
323
324 if (isRootRenderer || isBodyRenderer) {
325 // Propagate the new writing mode and direction up to the RenderView.
326 RenderView* viewRenderer = view();
327 RenderStyle* viewStyle = viewRenderer->style();
328 if (viewStyle->direction() != style()->direction() && (isRootRenderer || !document()->directionSetOnDocumentElement())) {
329 viewStyle->setDirection(style()->direction());
330 if (isBodyRenderer)
331 document()->documentElement()->renderer()->style()->setDirection(style()->direction());
332 setNeedsLayoutAndPrefWidthsRecalc();
333 }
334
335 if (viewStyle->writingMode() != style()->writingMode() && (isRootRenderer || !document()->writingModeSetOnDocumentElement())) {
336 viewStyle->setWritingMode(style()->writingMode());
337 viewRenderer->setHorizontalWritingMode(style()->isHorizontalWritingMode());
338 if (isBodyRenderer) {
339 document()->documentElement()->renderer()->style()->setWritingMode(style()->writingMode());
340 document()->documentElement()->renderer()->setHorizontalWritingMode(style()->isHorizontalWritingMode());
341 }
342 setNeedsLayoutAndPrefWidthsRecalc();
343 }
344 }
345 }
346
updateBoxModelInfoFromStyle()347 void RenderBox::updateBoxModelInfoFromStyle()
348 {
349 RenderBoxModelObject::updateBoxModelInfoFromStyle();
350
351 bool isRootObject = isRoot();
352 bool isViewObject = isRenderView();
353
354 // The root and the RenderView always paint their backgrounds/borders.
355 if (isRootObject || isViewObject)
356 setHasBoxDecorations(true);
357
358 setPositioned(style()->position() == AbsolutePosition || style()->position() == FixedPosition);
359 setFloating(!isPositioned() && style()->isFloating());
360
361 // We also handle <body> and <html>, whose overflow applies to the viewport.
362 if (style()->overflowX() != OVISIBLE && !isRootObject && (isRenderBlock() || isTableRow() || isTableSection())) {
363 bool boxHasOverflowClip = true;
364 if (isBody()) {
365 // Overflow on the body can propagate to the viewport under the following conditions.
366 // (1) The root element is <html>.
367 // (2) We are the primary <body> (can be checked by looking at document.body).
368 // (3) The root element has visible overflow.
369 if (document()->documentElement()->hasTagName(htmlTag) &&
370 document()->body() == node() &&
371 document()->documentElement()->renderer()->style()->overflowX() == OVISIBLE)
372 boxHasOverflowClip = false;
373 }
374
375 // Check for overflow clip.
376 // It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
377 if (boxHasOverflowClip) {
378 if (!s_hadOverflowClip)
379 // Erase the overflow
380 repaint();
381 setHasOverflowClip();
382 }
383 }
384
385 setHasTransform(style()->hasTransformRelatedProperty());
386 setHasReflection(style()->boxReflect());
387 }
388
layout()389 void RenderBox::layout()
390 {
391 ASSERT(needsLayout());
392
393 RenderObject* child = firstChild();
394 if (!child) {
395 setNeedsLayout(false);
396 return;
397 }
398
399 LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), style()->isFlippedBlocksWritingMode());
400 while (child) {
401 child->layoutIfNeeded();
402 ASSERT(!child->needsLayout());
403 child = child->nextSibling();
404 }
405 statePusher.pop();
406 setNeedsLayout(false);
407 }
408
409 // More IE extensions. clientWidth and clientHeight represent the interior of an object
410 // excluding border and scrollbar.
clientWidth() const411 int RenderBox::clientWidth() const
412 {
413 return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
414 }
415
clientHeight() const416 int RenderBox::clientHeight() const
417 {
418 return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
419 }
420
scrollWidth() const421 int RenderBox::scrollWidth() const
422 {
423 if (hasOverflowClip())
424 return layer()->scrollWidth();
425 // For objects with visible overflow, this matches IE.
426 // FIXME: Need to work right with writing modes.
427 if (style()->isLeftToRightDirection())
428 return max(clientWidth(), maxXLayoutOverflow() - borderLeft());
429 return clientWidth() - min(0, minXLayoutOverflow() - borderLeft());
430 }
431
scrollHeight() const432 int RenderBox::scrollHeight() const
433 {
434 if (hasOverflowClip())
435 return layer()->scrollHeight();
436 // For objects with visible overflow, this matches IE.
437 // FIXME: Need to work right with writing modes.
438 return max(clientHeight(), maxYLayoutOverflow() - borderTop());
439 }
440
scrollLeft() const441 int RenderBox::scrollLeft() const
442 {
443 return hasOverflowClip() ? layer()->scrollXOffset() : 0;
444 }
445
scrollTop() const446 int RenderBox::scrollTop() const
447 {
448 return hasOverflowClip() ? layer()->scrollYOffset() : 0;
449 }
450
setScrollLeft(int newLeft)451 void RenderBox::setScrollLeft(int newLeft)
452 {
453 if (hasOverflowClip())
454 layer()->scrollToXOffset(newLeft);
455 }
456
setScrollTop(int newTop)457 void RenderBox::setScrollTop(int newTop)
458 {
459 if (hasOverflowClip())
460 layer()->scrollToYOffset(newTop);
461 }
462
absoluteRects(Vector<IntRect> & rects,int tx,int ty)463 void RenderBox::absoluteRects(Vector<IntRect>& rects, int tx, int ty)
464 {
465 rects.append(IntRect(tx, ty, width(), height()));
466 }
467
absoluteQuads(Vector<FloatQuad> & quads)468 void RenderBox::absoluteQuads(Vector<FloatQuad>& quads)
469 {
470 quads.append(localToAbsoluteQuad(FloatRect(0, 0, width(), height())));
471 }
472
updateLayerTransform()473 void RenderBox::updateLayerTransform()
474 {
475 // Transform-origin depends on box size, so we need to update the layer transform after layout.
476 if (hasLayer())
477 layer()->updateTransform();
478 }
479
absoluteContentBox() const480 IntRect RenderBox::absoluteContentBox() const
481 {
482 IntRect rect = contentBoxRect();
483 FloatPoint absPos = localToAbsolute(FloatPoint());
484 rect.move(absPos.x(), absPos.y());
485 return rect;
486 }
487
absoluteContentQuad() const488 FloatQuad RenderBox::absoluteContentQuad() const
489 {
490 IntRect rect = contentBoxRect();
491 return localToAbsoluteQuad(FloatRect(rect));
492 }
493
outlineBoundsForRepaint(RenderBoxModelObject * repaintContainer,IntPoint * cachedOffsetToRepaintContainer) const494 IntRect RenderBox::outlineBoundsForRepaint(RenderBoxModelObject* repaintContainer, IntPoint* cachedOffsetToRepaintContainer) const
495 {
496 IntRect box = borderBoundingBox();
497 adjustRectForOutlineAndShadow(box);
498
499 FloatQuad containerRelativeQuad = FloatRect(box);
500 if (cachedOffsetToRepaintContainer)
501 containerRelativeQuad.move(cachedOffsetToRepaintContainer->x(), cachedOffsetToRepaintContainer->y());
502 else
503 containerRelativeQuad = localToContainerQuad(containerRelativeQuad, repaintContainer);
504
505 box = containerRelativeQuad.enclosingBoundingBox();
506
507 // FIXME: layoutDelta needs to be applied in parts before/after transforms and
508 // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
509 box.move(view()->layoutDelta());
510
511 return box;
512 }
513
addFocusRingRects(Vector<IntRect> & rects,int tx,int ty)514 void RenderBox::addFocusRingRects(Vector<IntRect>& rects, int tx, int ty)
515 {
516 if (width() && height())
517 rects.append(IntRect(tx, ty, width(), height()));
518 }
519
reflectionBox() const520 IntRect RenderBox::reflectionBox() const
521 {
522 IntRect result;
523 if (!style()->boxReflect())
524 return result;
525 IntRect box = borderBoxRect();
526 result = box;
527 switch (style()->boxReflect()->direction()) {
528 case ReflectionBelow:
529 result.move(0, box.height() + reflectionOffset());
530 break;
531 case ReflectionAbove:
532 result.move(0, -box.height() - reflectionOffset());
533 break;
534 case ReflectionLeft:
535 result.move(-box.width() - reflectionOffset(), 0);
536 break;
537 case ReflectionRight:
538 result.move(box.width() + reflectionOffset(), 0);
539 break;
540 }
541 return result;
542 }
543
reflectionOffset() const544 int RenderBox::reflectionOffset() const
545 {
546 if (!style()->boxReflect())
547 return 0;
548 if (style()->boxReflect()->direction() == ReflectionLeft || style()->boxReflect()->direction() == ReflectionRight)
549 return style()->boxReflect()->offset().calcValue(borderBoxRect().width());
550 return style()->boxReflect()->offset().calcValue(borderBoxRect().height());
551 }
552
reflectedRect(const IntRect & r) const553 IntRect RenderBox::reflectedRect(const IntRect& r) const
554 {
555 if (!style()->boxReflect())
556 return IntRect();
557
558 IntRect box = borderBoxRect();
559 IntRect result = r;
560 switch (style()->boxReflect()->direction()) {
561 case ReflectionBelow:
562 result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
563 break;
564 case ReflectionAbove:
565 result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
566 break;
567 case ReflectionLeft:
568 result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
569 break;
570 case ReflectionRight:
571 result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
572 break;
573 }
574 return result;
575 }
576
includeVerticalScrollbarSize() const577 bool RenderBox::includeVerticalScrollbarSize() const
578 {
579 return hasOverflowClip() && !layer()->hasOverlayScrollbars()
580 && (style()->overflowY() == OSCROLL || style()->overflowY() == OAUTO);
581 }
582
includeHorizontalScrollbarSize() const583 bool RenderBox::includeHorizontalScrollbarSize() const
584 {
585 return hasOverflowClip() && !layer()->hasOverlayScrollbars()
586 && (style()->overflowX() == OSCROLL || style()->overflowX() == OAUTO);
587 }
588
verticalScrollbarWidth() const589 int RenderBox::verticalScrollbarWidth() const
590 {
591 return includeVerticalScrollbarSize() ? layer()->verticalScrollbarWidth() : 0;
592 }
593
horizontalScrollbarHeight() const594 int RenderBox::horizontalScrollbarHeight() const
595 {
596 return includeHorizontalScrollbarSize() ? layer()->horizontalScrollbarHeight() : 0;
597 }
598
scroll(ScrollDirection direction,ScrollGranularity granularity,float multiplier,Node ** stopNode)599 bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
600 {
601 RenderLayer* l = layer();
602 if (l && l->scroll(direction, granularity, multiplier)) {
603 if (stopNode)
604 *stopNode = node();
605 return true;
606 }
607
608 if (stopNode && *stopNode && *stopNode == node())
609 return true;
610
611 RenderBlock* b = containingBlock();
612 if (b && !b->isRenderView())
613 return b->scroll(direction, granularity, multiplier, stopNode);
614 return false;
615 }
616
logicalScroll(ScrollLogicalDirection direction,ScrollGranularity granularity,float multiplier,Node ** stopNode)617 bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
618 {
619 bool scrolled = false;
620
621 RenderLayer* l = layer();
622 if (l) {
623 #if PLATFORM(MAC)
624 // On Mac only we reset the inline direction position when doing a document scroll (e.g., hitting Home/End).
625 if (granularity == ScrollByDocument)
626 scrolled = l->scroll(logicalToPhysical(ScrollInlineDirectionBackward, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()), ScrollByDocument, multiplier);
627 #endif
628 if (l->scroll(logicalToPhysical(direction, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()), granularity, multiplier))
629 scrolled = true;
630
631 if (scrolled) {
632 if (stopNode)
633 *stopNode = node();
634 return true;
635 }
636 }
637
638 if (stopNode && *stopNode && *stopNode == node())
639 return true;
640
641 RenderBlock* b = containingBlock();
642 if (b && !b->isRenderView())
643 return b->logicalScroll(direction, granularity, multiplier, stopNode);
644 return false;
645 }
646
canBeScrolledAndHasScrollableArea() const647 bool RenderBox::canBeScrolledAndHasScrollableArea() const
648 {
649 return canBeProgramaticallyScrolled(false) && (scrollHeight() != clientHeight() || scrollWidth() != clientWidth());
650 }
651
canBeProgramaticallyScrolled(bool) const652 bool RenderBox::canBeProgramaticallyScrolled(bool) const
653 {
654 return (hasOverflowClip() && (scrollsOverflow() || (node() && node()->rendererIsEditable()))) || (node() && node()->isDocumentNode());
655 }
656
autoscroll()657 void RenderBox::autoscroll()
658 {
659 if (layer())
660 layer()->autoscroll();
661 }
662
panScroll(const IntPoint & source)663 void RenderBox::panScroll(const IntPoint& source)
664 {
665 if (layer())
666 layer()->panScrollFromPoint(source);
667 }
668
minPreferredLogicalWidth() const669 int RenderBox::minPreferredLogicalWidth() const
670 {
671 if (preferredLogicalWidthsDirty())
672 const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
673
674 return m_minPreferredLogicalWidth;
675 }
676
maxPreferredLogicalWidth() const677 int RenderBox::maxPreferredLogicalWidth() const
678 {
679 if (preferredLogicalWidthsDirty())
680 const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
681
682 return m_maxPreferredLogicalWidth;
683 }
684
overrideSize() const685 int RenderBox::overrideSize() const
686 {
687 if (!hasOverrideSize())
688 return -1;
689 return gOverrideSizeMap->get(this);
690 }
691
setOverrideSize(int s)692 void RenderBox::setOverrideSize(int s)
693 {
694 if (s == -1) {
695 if (hasOverrideSize()) {
696 setHasOverrideSize(false);
697 gOverrideSizeMap->remove(this);
698 }
699 } else {
700 if (!gOverrideSizeMap)
701 gOverrideSizeMap = new OverrideSizeMap();
702 setHasOverrideSize(true);
703 gOverrideSizeMap->set(this, s);
704 }
705 }
706
overrideWidth() const707 int RenderBox::overrideWidth() const
708 {
709 return hasOverrideSize() ? overrideSize() : width();
710 }
711
overrideHeight() const712 int RenderBox::overrideHeight() const
713 {
714 return hasOverrideSize() ? overrideSize() : height();
715 }
716
computeBorderBoxLogicalWidth(int width) const717 int RenderBox::computeBorderBoxLogicalWidth(int width) const
718 {
719 int bordersPlusPadding = borderAndPaddingLogicalWidth();
720 if (style()->boxSizing() == CONTENT_BOX)
721 return width + bordersPlusPadding;
722 return max(width, bordersPlusPadding);
723 }
724
computeBorderBoxLogicalHeight(int height) const725 int RenderBox::computeBorderBoxLogicalHeight(int height) const
726 {
727 int bordersPlusPadding = borderAndPaddingLogicalHeight();
728 if (style()->boxSizing() == CONTENT_BOX)
729 return height + bordersPlusPadding;
730 return max(height, bordersPlusPadding);
731 }
732
computeContentBoxLogicalWidth(int width) const733 int RenderBox::computeContentBoxLogicalWidth(int width) const
734 {
735 if (style()->boxSizing() == BORDER_BOX)
736 width -= borderAndPaddingLogicalWidth();
737 return max(0, width);
738 }
739
computeContentBoxLogicalHeight(int height) const740 int RenderBox::computeContentBoxLogicalHeight(int height) const
741 {
742 if (style()->boxSizing() == BORDER_BOX)
743 height -= borderAndPaddingLogicalHeight();
744 return max(0, height);
745 }
746
747 // Hit Testing
nodeAtPoint(const HitTestRequest & request,HitTestResult & result,int xPos,int yPos,int tx,int ty,HitTestAction action)748 bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int xPos, int yPos, int tx, int ty, HitTestAction action)
749 {
750 tx += x();
751 ty += y();
752
753 // Check kids first.
754 for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
755 if (!child->hasLayer() && child->nodeAtPoint(request, result, xPos, yPos, tx, ty, action)) {
756 updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
757 return true;
758 }
759 }
760
761 // Check our bounds next. For this purpose always assume that we can only be hit in the
762 // foreground phase (which is true for replaced elements like images).
763 IntRect boundsRect = IntRect(tx, ty, width(), height());
764 if (visibleToHitTesting() && action == HitTestForeground && boundsRect.intersects(result.rectForPoint(xPos, yPos))) {
765 updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
766 if (!result.addNodeToRectBasedTestResult(node(), xPos, yPos, boundsRect))
767 return true;
768 }
769
770 return false;
771 }
772
773 // --------------------- painting stuff -------------------------------
774
paint(PaintInfo & paintInfo,int tx,int ty)775 void RenderBox::paint(PaintInfo& paintInfo, int tx, int ty)
776 {
777 tx += x();
778 ty += y();
779
780 // default implementation. Just pass paint through to the children
781 PaintInfo childInfo(paintInfo);
782 childInfo.updatePaintingRootForChildren(this);
783 for (RenderObject* child = firstChild(); child; child = child->nextSibling())
784 child->paint(childInfo, tx, ty);
785 }
786
paintRootBoxFillLayers(const PaintInfo & paintInfo)787 void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
788 {
789 const FillLayer* bgLayer = style()->backgroundLayers();
790 Color bgColor = style()->visitedDependentColor(CSSPropertyBackgroundColor);
791 RenderObject* bodyObject = 0;
792 if (!hasBackground() && node() && node()->hasTagName(HTMLNames::htmlTag)) {
793 // Locate the <body> element using the DOM. This is easier than trying
794 // to crawl around a render tree with potential :before/:after content and
795 // anonymous blocks created by inline <body> tags etc. We can locate the <body>
796 // render object very easily via the DOM.
797 HTMLElement* body = document()->body();
798 bodyObject = (body && body->hasLocalName(bodyTag)) ? body->renderer() : 0;
799 if (bodyObject) {
800 bgLayer = bodyObject->style()->backgroundLayers();
801 bgColor = bodyObject->style()->visitedDependentColor(CSSPropertyBackgroundColor);
802 }
803 }
804
805 // The background of the box generated by the root element covers the entire canvas, so just use
806 // the RenderView's docTop/Left/Width/Height accessors.
807 paintFillLayers(paintInfo, bgColor, bgLayer, view()->docLeft(), view()->docTop(), view()->docWidth(), view()->docHeight(), BackgroundBleedNone, CompositeSourceOver, bodyObject);
808 }
809
paintBoxDecorations(PaintInfo & paintInfo,int tx,int ty)810 void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
811 {
812 if (!paintInfo.shouldPaintWithinRoot(this))
813 return;
814 return paintBoxDecorationsWithSize(paintInfo, tx, ty, width(), height());
815 }
816
determineBackgroundBleedAvoidance(GraphicsContext * context) const817 BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context) const
818 {
819 if (context->paintingDisabled())
820 return BackgroundBleedNone;
821
822 const RenderStyle* style = this->style();
823
824 if (!style->hasBackground() || !style->hasBorder() || !style->hasBorderRadius() || borderImageIsLoadedAndCanBeRendered())
825 return BackgroundBleedNone;
826
827 AffineTransform ctm = context->getCTM();
828 FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
829 if (borderObscuresBackgroundEdge(contextScaling))
830 return BackgroundBleedShrinkBackground;
831
832 // FIXME: there is one more strategy possible, for opaque backgrounds and
833 // translucent borders. In that case we could avoid using a transparency layer,
834 // and paint the border first, and then paint the background clipped to the
835 // inside of the border.
836
837 return BackgroundBleedUseTransparencyLayer;
838 }
839
paintBoxDecorationsWithSize(PaintInfo & paintInfo,int tx,int ty,int width,int height)840 void RenderBox::paintBoxDecorationsWithSize(PaintInfo& paintInfo, int tx, int ty, int width, int height)
841 {
842 // border-fit can adjust where we paint our border and background. If set, we snugly fit our line box descendants. (The iChat
843 // balloon layout is an example of this).
844 borderFitAdjust(tx, width);
845
846 // FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
847 // custom shadows of their own.
848 paintBoxShadow(paintInfo.context, tx, ty, width, height, style(), Normal);
849
850 BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
851
852 GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
853 if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
854 // To avoid the background color bleeding out behind the border, we'll render background and border
855 // into a transparency layer, and then clip that in one go (which requires setting up the clip before
856 // beginning the layer).
857 RoundedIntRect border = style()->getRoundedBorderFor(IntRect(tx, ty, width, height));
858 stateSaver.save();
859 paintInfo.context->addRoundedRectClip(border);
860 paintInfo.context->beginTransparencyLayer(1);
861 }
862
863 // If we have a native theme appearance, paint that before painting our background.
864 // The theme will tell us whether or not we should also paint the CSS background.
865 bool themePainted = style()->hasAppearance() && !theme()->paint(this, paintInfo, IntRect(tx, ty, width, height));
866 if (!themePainted) {
867 if (isRoot())
868 paintRootBoxFillLayers(paintInfo);
869 else if (!isBody() || document()->documentElement()->renderer()->hasBackground()) {
870 // The <body> only paints its background if the root element has defined a background
871 // independent of the body.
872 paintFillLayers(paintInfo, style()->visitedDependentColor(CSSPropertyBackgroundColor), style()->backgroundLayers(), tx, ty, width, height, bleedAvoidance);
873 }
874 if (style()->hasAppearance())
875 theme()->paintDecorations(this, paintInfo, IntRect(tx, ty, width, height));
876 }
877 paintBoxShadow(paintInfo.context, tx, ty, width, height, style(), Inset);
878
879 // The theme will tell us whether or not we should also paint the CSS border.
880 if ((!style()->hasAppearance() || (!themePainted && theme()->paintBorderOnly(this, paintInfo, IntRect(tx, ty, width, height)))) && style()->hasBorder())
881 paintBorder(paintInfo.context, tx, ty, width, height, style(), bleedAvoidance);
882
883 if (bleedAvoidance == BackgroundBleedUseTransparencyLayer)
884 paintInfo.context->endTransparencyLayer();
885 }
886
paintMask(PaintInfo & paintInfo,int tx,int ty)887 void RenderBox::paintMask(PaintInfo& paintInfo, int tx, int ty)
888 {
889 if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask || paintInfo.context->paintingDisabled())
890 return;
891
892 int w = width();
893 int h = height();
894
895 // border-fit can adjust where we paint our border and background. If set, we snugly fit our line box descendants. (The iChat
896 // balloon layout is an example of this).
897 borderFitAdjust(tx, w);
898
899 paintMaskImages(paintInfo, tx, ty, w, h);
900 }
901
paintMaskImages(const PaintInfo & paintInfo,int tx,int ty,int w,int h)902 void RenderBox::paintMaskImages(const PaintInfo& paintInfo, int tx, int ty, int w, int h)
903 {
904 // Figure out if we need to push a transparency layer to render our mask.
905 bool pushTransparencyLayer = false;
906 bool compositedMask = hasLayer() && layer()->hasCompositedMask();
907 CompositeOperator compositeOp = CompositeSourceOver;
908
909 bool allMaskImagesLoaded = true;
910
911 if (!compositedMask) {
912 // If the context has a rotation, scale or skew, then use a transparency layer to avoid
913 // pixel cruft around the edge of the mask.
914 const AffineTransform& currentCTM = paintInfo.context->getCTM();
915 pushTransparencyLayer = !currentCTM.isIdentityOrTranslationOrFlipped();
916
917 StyleImage* maskBoxImage = style()->maskBoxImage().image();
918 const FillLayer* maskLayers = style()->maskLayers();
919
920 // Don't render a masked element until all the mask images have loaded, to prevent a flash of unmasked content.
921 if (maskBoxImage)
922 allMaskImagesLoaded &= maskBoxImage->isLoaded();
923
924 if (maskLayers)
925 allMaskImagesLoaded &= maskLayers->imagesAreLoaded();
926
927 // Before all images have loaded, just use an empty transparency layer as the mask.
928 if (!allMaskImagesLoaded)
929 pushTransparencyLayer = true;
930
931 if (maskBoxImage && maskLayers->hasImage()) {
932 // We have a mask-box-image and mask-image, so need to composite them together before using the result as a mask.
933 pushTransparencyLayer = true;
934 } else {
935 // We have to use an extra image buffer to hold the mask. Multiple mask images need
936 // to composite together using source-over so that they can then combine into a single unified mask that
937 // can be composited with the content using destination-in. SVG images need to be able to set compositing modes
938 // as they draw images contained inside their sub-document, so we paint all our images into a separate buffer
939 // and composite that buffer as the mask.
940 // We have to check that the mask images to be rendered contain at least one image that can be actually used in rendering
941 // before pushing the transparency layer.
942 for (const FillLayer* fillLayer = maskLayers->next(); fillLayer; fillLayer = fillLayer->next()) {
943 if (fillLayer->hasImage() && fillLayer->image()->canRender(style()->effectiveZoom())) {
944 pushTransparencyLayer = true;
945 // We found one image that can be used in rendering, exit the loop
946 break;
947 }
948 }
949 }
950
951 compositeOp = CompositeDestinationIn;
952 if (pushTransparencyLayer) {
953 paintInfo.context->setCompositeOperation(CompositeDestinationIn);
954 paintInfo.context->beginTransparencyLayer(1.0f);
955 compositeOp = CompositeSourceOver;
956 }
957 }
958
959 if (allMaskImagesLoaded) {
960 paintFillLayers(paintInfo, Color(), style()->maskLayers(), tx, ty, w, h, BackgroundBleedNone, compositeOp);
961 paintNinePieceImage(paintInfo.context, tx, ty, w, h, style(), style()->maskBoxImage(), compositeOp);
962 }
963
964 if (pushTransparencyLayer)
965 paintInfo.context->endTransparencyLayer();
966 }
967
maskClipRect()968 IntRect RenderBox::maskClipRect()
969 {
970 IntRect bbox = borderBoxRect();
971 if (style()->maskBoxImage().image())
972 return bbox;
973
974 IntRect result;
975 for (const FillLayer* maskLayer = style()->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
976 if (maskLayer->image()) {
977 IntRect maskRect;
978 IntPoint phase;
979 IntSize tileSize;
980 calculateBackgroundImageGeometry(maskLayer, bbox.x(), bbox.y(), bbox.width(), bbox.height(), maskRect, phase, tileSize);
981 result.unite(maskRect);
982 }
983 }
984 return result;
985 }
986
paintFillLayers(const PaintInfo & paintInfo,const Color & c,const FillLayer * fillLayer,int tx,int ty,int width,int height,BackgroundBleedAvoidance bleedAvoidance,CompositeOperator op,RenderObject * backgroundObject)987 void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, int tx, int ty, int width, int height,
988 BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
989 {
990 if (!fillLayer)
991 return;
992
993 paintFillLayers(paintInfo, c, fillLayer->next(), tx, ty, width, height, bleedAvoidance, op, backgroundObject);
994 paintFillLayer(paintInfo, c, fillLayer, tx, ty, width, height, bleedAvoidance, op, backgroundObject);
995 }
996
paintFillLayer(const PaintInfo & paintInfo,const Color & c,const FillLayer * fillLayer,int tx,int ty,int width,int height,BackgroundBleedAvoidance bleedAvoidance,CompositeOperator op,RenderObject * backgroundObject)997 void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, int tx, int ty, int width, int height,
998 BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
999 {
1000 paintFillLayerExtended(paintInfo, c, fillLayer, tx, ty, width, height, bleedAvoidance, 0, 0, 0, op, backgroundObject);
1001 }
1002
1003 #if USE(ACCELERATED_COMPOSITING)
layersUseImage(WrappedImagePtr image,const FillLayer * layers)1004 static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
1005 {
1006 for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
1007 if (curLayer->image() && image == curLayer->image()->data())
1008 return true;
1009 }
1010
1011 return false;
1012 }
1013 #endif
1014
imageChanged(WrappedImagePtr image,const IntRect *)1015 void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
1016 {
1017 if (!parent())
1018 return;
1019
1020 if ((style()->borderImage().image() && style()->borderImage().image()->data() == image) ||
1021 (style()->maskBoxImage().image() && style()->maskBoxImage().image()->data() == image)) {
1022 repaint();
1023 return;
1024 }
1025
1026 bool didFullRepaint = repaintLayerRectsForImage(image, style()->backgroundLayers(), true);
1027 if (!didFullRepaint)
1028 repaintLayerRectsForImage(image, style()->maskLayers(), false);
1029
1030
1031 #if USE(ACCELERATED_COMPOSITING)
1032 if (hasLayer() && layer()->hasCompositedMask() && layersUseImage(image, style()->maskLayers()))
1033 layer()->contentChanged(RenderLayer::MaskImageChanged);
1034 #endif
1035 }
1036
repaintLayerRectsForImage(WrappedImagePtr image,const FillLayer * layers,bool drawingBackground)1037 bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground)
1038 {
1039 IntRect rendererRect;
1040 RenderBox* layerRenderer = 0;
1041
1042 for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
1043 if (curLayer->image() && image == curLayer->image()->data() && curLayer->image()->canRender(style()->effectiveZoom())) {
1044 // Now that we know this image is being used, compute the renderer and the rect
1045 // if we haven't already
1046 if (!layerRenderer) {
1047 bool drawingRootBackground = drawingBackground && (isRoot() || (isBody() && !document()->documentElement()->renderer()->hasBackground()));
1048 if (drawingRootBackground) {
1049 layerRenderer = view();
1050
1051 int rw;
1052 int rh;
1053
1054 if (FrameView* frameView = toRenderView(layerRenderer)->frameView()) {
1055 rw = frameView->contentsWidth();
1056 rh = frameView->contentsHeight();
1057 } else {
1058 rw = layerRenderer->width();
1059 rh = layerRenderer->height();
1060 }
1061 rendererRect = IntRect(-layerRenderer->marginLeft(),
1062 -layerRenderer->marginTop(),
1063 max(layerRenderer->width() + layerRenderer->marginLeft() + layerRenderer->marginRight() + layerRenderer->borderLeft() + layerRenderer->borderRight(), rw),
1064 max(layerRenderer->height() + layerRenderer->marginTop() + layerRenderer->marginBottom() + layerRenderer->borderTop() + layerRenderer->borderBottom(), rh));
1065 } else {
1066 layerRenderer = this;
1067 rendererRect = borderBoxRect();
1068 }
1069 }
1070
1071 IntRect repaintRect;
1072 IntPoint phase;
1073 IntSize tileSize;
1074 layerRenderer->calculateBackgroundImageGeometry(curLayer, rendererRect.x(), rendererRect.y(), rendererRect.width(), rendererRect.height(), repaintRect, phase, tileSize);
1075 layerRenderer->repaintRectangle(repaintRect);
1076 if (repaintRect == rendererRect)
1077 return true;
1078 }
1079 }
1080 return false;
1081 }
1082
1083 #if PLATFORM(MAC)
1084
paintCustomHighlight(int tx,int ty,const AtomicString & type,bool behindText)1085 void RenderBox::paintCustomHighlight(int tx, int ty, const AtomicString& type, bool behindText)
1086 {
1087 Frame* frame = this->frame();
1088 if (!frame)
1089 return;
1090 Page* page = frame->page();
1091 if (!page)
1092 return;
1093
1094 InlineBox* boxWrap = inlineBoxWrapper();
1095 RootInlineBox* r = boxWrap ? boxWrap->root() : 0;
1096 if (r) {
1097 FloatRect rootRect(tx + r->x(), ty + r->selectionTop(), r->logicalWidth(), r->selectionHeight());
1098 FloatRect imageRect(tx + x(), rootRect.y(), width(), rootRect.height());
1099 page->chrome()->client()->paintCustomHighlight(node(), type, imageRect, rootRect, behindText, false);
1100 } else {
1101 FloatRect imageRect(tx + x(), ty + y(), width(), height());
1102 page->chrome()->client()->paintCustomHighlight(node(), type, imageRect, imageRect, behindText, false);
1103 }
1104 }
1105
1106 #endif
1107
pushContentsClip(PaintInfo & paintInfo,int tx,int ty)1108 bool RenderBox::pushContentsClip(PaintInfo& paintInfo, int tx, int ty)
1109 {
1110 if (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseSelfOutline || paintInfo.phase == PaintPhaseMask)
1111 return false;
1112
1113 bool isControlClip = hasControlClip();
1114 bool isOverflowClip = hasOverflowClip() && !layer()->isSelfPaintingLayer();
1115
1116 if (!isControlClip && !isOverflowClip)
1117 return false;
1118
1119 if (paintInfo.phase == PaintPhaseOutline)
1120 paintInfo.phase = PaintPhaseChildOutlines;
1121 else if (paintInfo.phase == PaintPhaseChildBlockBackground) {
1122 paintInfo.phase = PaintPhaseBlockBackground;
1123 paintObject(paintInfo, tx, ty);
1124 paintInfo.phase = PaintPhaseChildBlockBackgrounds;
1125 }
1126 IntRect clipRect(isControlClip ? controlClipRect(tx, ty) : overflowClipRect(tx, ty));
1127 paintInfo.context->save();
1128 if (style()->hasBorderRadius())
1129 paintInfo.context->addRoundedRectClip(style()->getRoundedBorderFor(IntRect(tx, ty, width(), height())));
1130 paintInfo.context->clip(clipRect);
1131 return true;
1132 }
1133
popContentsClip(PaintInfo & paintInfo,PaintPhase originalPhase,int tx,int ty)1134 void RenderBox::popContentsClip(PaintInfo& paintInfo, PaintPhase originalPhase, int tx, int ty)
1135 {
1136 ASSERT(hasControlClip() || (hasOverflowClip() && !layer()->isSelfPaintingLayer()));
1137
1138 paintInfo.context->restore();
1139 if (originalPhase == PaintPhaseOutline) {
1140 paintInfo.phase = PaintPhaseSelfOutline;
1141 paintObject(paintInfo, tx, ty);
1142 paintInfo.phase = originalPhase;
1143 } else if (originalPhase == PaintPhaseChildBlockBackground)
1144 paintInfo.phase = originalPhase;
1145 }
1146
overflowClipRect(int tx,int ty,OverlayScrollbarSizeRelevancy relevancy)1147 IntRect RenderBox::overflowClipRect(int tx, int ty, OverlayScrollbarSizeRelevancy relevancy)
1148 {
1149 // FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
1150 // here.
1151
1152 int bLeft = borderLeft();
1153 int bTop = borderTop();
1154
1155 int clipX = tx + bLeft;
1156 int clipY = ty + bTop;
1157 int clipWidth = width() - bLeft - borderRight();
1158 int clipHeight = height() - bTop - borderBottom();
1159
1160 // Subtract out scrollbars if we have them.
1161 if (layer()) {
1162 clipWidth -= layer()->verticalScrollbarWidth(relevancy);
1163 clipHeight -= layer()->horizontalScrollbarHeight(relevancy);
1164 }
1165
1166 return IntRect(clipX, clipY, clipWidth, clipHeight);
1167 }
1168
clipRect(int tx,int ty)1169 IntRect RenderBox::clipRect(int tx, int ty)
1170 {
1171 int clipX = tx;
1172 int clipY = ty;
1173 int clipWidth = width();
1174 int clipHeight = height();
1175
1176 if (!style()->clipLeft().isAuto()) {
1177 int c = style()->clipLeft().calcValue(width());
1178 clipX += c;
1179 clipWidth -= c;
1180 }
1181
1182 if (!style()->clipRight().isAuto())
1183 clipWidth -= width() - style()->clipRight().calcValue(width());
1184
1185 if (!style()->clipTop().isAuto()) {
1186 int c = style()->clipTop().calcValue(height());
1187 clipY += c;
1188 clipHeight -= c;
1189 }
1190
1191 if (!style()->clipBottom().isAuto())
1192 clipHeight -= height() - style()->clipBottom().calcValue(height());
1193
1194 return IntRect(clipX, clipY, clipWidth, clipHeight);
1195 }
1196
containingBlockLogicalWidthForContent() const1197 int RenderBox::containingBlockLogicalWidthForContent() const
1198 {
1199 RenderBlock* cb = containingBlock();
1200 if (shrinkToAvoidFloats())
1201 return cb->availableLogicalWidthForLine(y(), false);
1202 return cb->availableLogicalWidth();
1203 }
1204
perpendicularContainingBlockLogicalHeight() const1205 int RenderBox::perpendicularContainingBlockLogicalHeight() const
1206 {
1207 RenderBlock* cb = containingBlock();
1208 RenderStyle* containingBlockStyle = cb->style();
1209 Length logicalHeightLength = containingBlockStyle->logicalHeight();
1210
1211 // FIXME: For now just support fixed heights. Eventually should support percentage heights as well.
1212 if (!logicalHeightLength.isFixed()) {
1213 // Rather than making the child be completely unconstrained, WinIE uses the viewport width and height
1214 // as a constraint. We do that for now as well even though it's likely being unconstrained is what the spec
1215 // will decide.
1216 return containingBlockStyle->isHorizontalWritingMode() ? view()->frameView()->visibleHeight() : view()->frameView()->visibleWidth();
1217 }
1218
1219 // Use the content box logical height as specified by the style.
1220 return cb->computeContentBoxLogicalHeight(logicalHeightLength.value());
1221 }
1222
mapLocalToContainer(RenderBoxModelObject * repaintContainer,bool fixed,bool useTransforms,TransformState & transformState) const1223 void RenderBox::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState& transformState) const
1224 {
1225 if (repaintContainer == this)
1226 return;
1227
1228 if (RenderView* v = view()) {
1229 if (v->layoutStateEnabled() && !repaintContainer) {
1230 LayoutState* layoutState = v->layoutState();
1231 IntSize offset = layoutState->m_paintOffset;
1232 offset.expand(x(), y());
1233 if (style()->position() == RelativePosition && layer())
1234 offset += layer()->relativePositionOffset();
1235 transformState.move(offset);
1236 return;
1237 }
1238 }
1239
1240 bool containerSkipped;
1241 RenderObject* o = container(repaintContainer, &containerSkipped);
1242 if (!o)
1243 return;
1244
1245 bool isFixedPos = style()->position() == FixedPosition;
1246 bool hasTransform = hasLayer() && layer()->transform();
1247 if (hasTransform) {
1248 // If this box has a transform, it acts as a fixed position container for fixed descendants,
1249 // and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
1250 fixed &= isFixedPos;
1251 } else
1252 fixed |= isFixedPos;
1253
1254 IntSize containerOffset = offsetFromContainer(o, roundedIntPoint(transformState.mappedPoint()));
1255
1256 bool preserve3D = useTransforms && (o->style()->preserves3D() || style()->preserves3D());
1257 if (useTransforms && shouldUseTransformFromContainer(o)) {
1258 TransformationMatrix t;
1259 getTransformFromContainer(o, containerOffset, t);
1260 transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
1261 } else
1262 transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
1263
1264 if (containerSkipped) {
1265 // There can't be a transform between repaintContainer and o, because transforms create containers, so it should be safe
1266 // to just subtract the delta between the repaintContainer and o.
1267 IntSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
1268 transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
1269 return;
1270 }
1271
1272 o->mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);
1273 }
1274
mapAbsoluteToLocalPoint(bool fixed,bool useTransforms,TransformState & transformState) const1275 void RenderBox::mapAbsoluteToLocalPoint(bool fixed, bool useTransforms, TransformState& transformState) const
1276 {
1277 // We don't expect absoluteToLocal() to be called during layout (yet)
1278 ASSERT(!view() || !view()->layoutStateEnabled());
1279
1280 bool isFixedPos = style()->position() == FixedPosition;
1281 bool hasTransform = hasLayer() && layer()->transform();
1282 if (hasTransform) {
1283 // If this box has a transform, it acts as a fixed position container for fixed descendants,
1284 // and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
1285 fixed &= isFixedPos;
1286 } else
1287 fixed |= isFixedPos;
1288
1289 RenderObject* o = container();
1290 if (!o)
1291 return;
1292
1293 o->mapAbsoluteToLocalPoint(fixed, useTransforms, transformState);
1294
1295 IntSize containerOffset = offsetFromContainer(o, IntPoint());
1296
1297 bool preserve3D = useTransforms && (o->style()->preserves3D() || style()->preserves3D());
1298 if (useTransforms && shouldUseTransformFromContainer(o)) {
1299 TransformationMatrix t;
1300 getTransformFromContainer(o, containerOffset, t);
1301 transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
1302 } else
1303 transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
1304 }
1305
offsetFromContainer(RenderObject * o,const IntPoint & point) const1306 IntSize RenderBox::offsetFromContainer(RenderObject* o, const IntPoint& point) const
1307 {
1308 ASSERT(o == container());
1309
1310 IntSize offset;
1311 if (isRelPositioned())
1312 offset += relativePositionOffset();
1313
1314 if (!isInline() || isReplaced()) {
1315 if (style()->position() != AbsolutePosition && style()->position() != FixedPosition) {
1316 if (o->hasColumns()) {
1317 IntRect columnRect(frameRect());
1318 toRenderBlock(o)->flipForWritingModeIncludingColumns(columnRect);
1319 offset += IntSize(columnRect.location().x(), columnRect.location().y());
1320 columnRect.move(point.x(), point.y());
1321 o->adjustForColumns(offset, columnRect.location());
1322 } else
1323 offset += locationOffsetIncludingFlipping();
1324 } else
1325 offset += locationOffsetIncludingFlipping();
1326 }
1327
1328 if (o->hasOverflowClip())
1329 offset -= toRenderBox(o)->layer()->scrolledContentOffset();
1330
1331 if (style()->position() == AbsolutePosition && o->isRelPositioned() && o->isRenderInline())
1332 offset += toRenderInline(o)->relativePositionedInlineOffset(this);
1333
1334 return offset;
1335 }
1336
createInlineBox()1337 InlineBox* RenderBox::createInlineBox()
1338 {
1339 return new (renderArena()) InlineBox(this);
1340 }
1341
dirtyLineBoxes(bool fullLayout)1342 void RenderBox::dirtyLineBoxes(bool fullLayout)
1343 {
1344 if (m_inlineBoxWrapper) {
1345 if (fullLayout) {
1346 m_inlineBoxWrapper->destroy(renderArena());
1347 m_inlineBoxWrapper = 0;
1348 } else
1349 m_inlineBoxWrapper->dirtyLineBoxes();
1350 }
1351 }
1352
positionLineBox(InlineBox * box)1353 void RenderBox::positionLineBox(InlineBox* box)
1354 {
1355 if (isPositioned()) {
1356 // Cache the x position only if we were an INLINE type originally.
1357 bool wasInline = style()->isOriginalDisplayInlineType();
1358 if (wasInline) {
1359 // The value is cached in the xPos of the box. We only need this value if
1360 // our object was inline originally, since otherwise it would have ended up underneath
1361 // the inlines.
1362 layer()->setStaticInlinePosition(lroundf(box->logicalLeft()));
1363 if (style()->hasStaticInlinePosition(box->isHorizontal()))
1364 setChildNeedsLayout(true, false); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
1365 } else {
1366 // Our object was a block originally, so we make our normal flow position be
1367 // just below the line box (as though all the inlines that came before us got
1368 // wrapped in an anonymous block, which is what would have happened had we been
1369 // in flow). This value was cached in the y() of the box.
1370 layer()->setStaticBlockPosition(box->logicalTop());
1371 if (style()->hasStaticBlockPosition(box->isHorizontal()))
1372 setChildNeedsLayout(true, false); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
1373 }
1374
1375 // Nuke the box.
1376 box->remove();
1377 box->destroy(renderArena());
1378 } else if (isReplaced()) {
1379 setLocation(lroundf(box->x()), lroundf(box->y()));
1380 if (m_inlineBoxWrapper)
1381 deleteLineBoxWrapper();
1382 m_inlineBoxWrapper = box;
1383 }
1384 }
1385
deleteLineBoxWrapper()1386 void RenderBox::deleteLineBoxWrapper()
1387 {
1388 if (m_inlineBoxWrapper) {
1389 if (!documentBeingDestroyed())
1390 m_inlineBoxWrapper->remove();
1391 m_inlineBoxWrapper->destroy(renderArena());
1392 m_inlineBoxWrapper = 0;
1393 }
1394 }
1395
clippedOverflowRectForRepaint(RenderBoxModelObject * repaintContainer)1396 IntRect RenderBox::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)
1397 {
1398 if (style()->visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
1399 return IntRect();
1400
1401 IntRect r = visualOverflowRect();
1402
1403 RenderView* v = view();
1404 if (v) {
1405 // FIXME: layoutDelta needs to be applied in parts before/after transforms and
1406 // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
1407 r.move(v->layoutDelta());
1408 }
1409
1410 if (style()) {
1411 if (style()->hasAppearance())
1412 // The theme may wish to inflate the rect used when repainting.
1413 theme()->adjustRepaintRect(this, r);
1414
1415 // We have to use maximalOutlineSize() because a child might have an outline
1416 // that projects outside of our overflowRect.
1417 if (v) {
1418 ASSERT(style()->outlineSize() <= v->maximalOutlineSize());
1419 r.inflate(v->maximalOutlineSize());
1420 }
1421 }
1422
1423 computeRectForRepaint(repaintContainer, r);
1424 return r;
1425 }
1426
computeRectForRepaint(RenderBoxModelObject * repaintContainer,IntRect & rect,bool fixed)1427 void RenderBox::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& rect, bool fixed)
1428 {
1429 // The rect we compute at each step is shifted by our x/y offset in the parent container's coordinate space.
1430 // Only when we cross a writing mode boundary will we have to possibly flipForWritingMode (to convert into a more appropriate
1431 // offset corner for the enclosing container). This allows for a fully RL or BT document to repaint
1432 // properly even during layout, since the rect remains flipped all the way until the end.
1433 //
1434 // RenderView::computeRectForRepaint then converts the rect to physical coordinates. We also convert to
1435 // physical when we hit a repaintContainer boundary. Therefore the final rect returned is always in the
1436 // physical coordinate space of the repaintContainer.
1437 if (RenderView* v = view()) {
1438 // LayoutState is only valid for root-relative, non-fixed position repainting
1439 if (v->layoutStateEnabled() && !repaintContainer && style()->position() != FixedPosition) {
1440 LayoutState* layoutState = v->layoutState();
1441
1442 if (layer() && layer()->transform())
1443 rect = layer()->transform()->mapRect(rect);
1444
1445 if (style()->position() == RelativePosition && layer())
1446 rect.move(layer()->relativePositionOffset());
1447
1448 rect.move(x(), y());
1449 rect.move(layoutState->m_paintOffset);
1450 if (layoutState->m_clipped)
1451 rect.intersect(layoutState->m_clipRect);
1452 return;
1453 }
1454 }
1455
1456 if (hasReflection())
1457 rect.unite(reflectedRect(rect));
1458
1459 if (repaintContainer == this) {
1460 if (repaintContainer->style()->isFlippedBlocksWritingMode())
1461 flipForWritingMode(rect);
1462 return;
1463 }
1464
1465 bool containerSkipped;
1466 RenderObject* o = container(repaintContainer, &containerSkipped);
1467 if (!o)
1468 return;
1469
1470 if (isWritingModeRoot() && !isPositioned())
1471 flipForWritingMode(rect);
1472 IntPoint topLeft = rect.location();
1473 topLeft.move(x(), y());
1474
1475 EPosition position = style()->position();
1476
1477 // We are now in our parent container's coordinate space. Apply our transform to obtain a bounding box
1478 // in the parent's coordinate space that encloses us.
1479 if (layer() && layer()->transform()) {
1480 fixed = position == FixedPosition;
1481 rect = layer()->transform()->mapRect(rect);
1482 topLeft = rect.location();
1483 topLeft.move(x(), y());
1484 } else if (position == FixedPosition)
1485 fixed = true;
1486
1487 if (position == AbsolutePosition && o->isRelPositioned() && o->isRenderInline())
1488 topLeft += toRenderInline(o)->relativePositionedInlineOffset(this);
1489 else if (position == RelativePosition && layer()) {
1490 // Apply the relative position offset when invalidating a rectangle. The layer
1491 // is translated, but the render box isn't, so we need to do this to get the
1492 // right dirty rect. Since this is called from RenderObject::setStyle, the relative position
1493 // flag on the RenderObject has been cleared, so use the one on the style().
1494 topLeft += layer()->relativePositionOffset();
1495 }
1496
1497 if (o->isBlockFlow() && position != AbsolutePosition && position != FixedPosition) {
1498 RenderBlock* cb = toRenderBlock(o);
1499 if (cb->hasColumns()) {
1500 IntRect repaintRect(topLeft, rect.size());
1501 cb->adjustRectForColumns(repaintRect);
1502 topLeft = repaintRect.location();
1503 rect = repaintRect;
1504 }
1505 }
1506
1507 // FIXME: We ignore the lightweight clipping rect that controls use, since if |o| is in mid-layout,
1508 // its controlClipRect will be wrong. For overflow clip we use the values cached by the layer.
1509 if (o->hasOverflowClip()) {
1510 RenderBox* containerBox = toRenderBox(o);
1511
1512 // o->height() is inaccurate if we're in the middle of a layout of |o|, so use the
1513 // layer's size instead. Even if the layer's size is wrong, the layer itself will repaint
1514 // anyway if its size does change.
1515 topLeft -= containerBox->layer()->scrolledContentOffset(); // For overflow:auto/scroll/hidden.
1516
1517 IntRect repaintRect(topLeft, rect.size());
1518 IntRect boxRect(0, 0, containerBox->layer()->width(), containerBox->layer()->height());
1519 rect = intersection(repaintRect, boxRect);
1520 if (rect.isEmpty())
1521 return;
1522 } else
1523 rect.setLocation(topLeft);
1524
1525 if (containerSkipped) {
1526 // If the repaintContainer is below o, then we need to map the rect into repaintContainer's coordinates.
1527 IntSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
1528 rect.move(-containerOffset);
1529 return;
1530 }
1531
1532 o->computeRectForRepaint(repaintContainer, rect, fixed);
1533 }
1534
repaintDuringLayoutIfMoved(const IntRect & rect)1535 void RenderBox::repaintDuringLayoutIfMoved(const IntRect& rect)
1536 {
1537 int newX = x();
1538 int newY = y();
1539 int newWidth = width();
1540 int newHeight = height();
1541 if (rect.x() != newX || rect.y() != newY) {
1542 // The child moved. Invalidate the object's old and new positions. We have to do this
1543 // since the object may not have gotten a layout.
1544 m_frameRect = rect;
1545 repaint();
1546 repaintOverhangingFloats(true);
1547 m_frameRect = IntRect(newX, newY, newWidth, newHeight);
1548 repaint();
1549 repaintOverhangingFloats(true);
1550 }
1551 }
1552
computeLogicalWidth()1553 void RenderBox::computeLogicalWidth()
1554 {
1555 if (isPositioned()) {
1556 // FIXME: This calculation is not patched for block-flow yet.
1557 // https://bugs.webkit.org/show_bug.cgi?id=46500
1558 computePositionedLogicalWidth();
1559 return;
1560 }
1561
1562 // If layout is limited to a subtree, the subtree root's logical width does not change.
1563 if (node() && view()->frameView() && view()->frameView()->layoutRoot(true) == this)
1564 return;
1565
1566 // The parent box is flexing us, so it has increased or decreased our
1567 // width. Use the width from the style context.
1568 // FIXME: Account for block-flow in flexible boxes.
1569 // https://bugs.webkit.org/show_bug.cgi?id=46418
1570 if (hasOverrideSize() && parent()->style()->boxOrient() == HORIZONTAL
1571 && parent()->isFlexibleBox() && parent()->isFlexingChildren()) {
1572 setLogicalWidth(overrideSize());
1573 return;
1574 }
1575
1576 // FIXME: Account for block-flow in flexible boxes.
1577 // https://bugs.webkit.org/show_bug.cgi?id=46418
1578 bool inVerticalBox = parent()->isFlexibleBox() && (parent()->style()->boxOrient() == VERTICAL);
1579 bool stretching = (parent()->style()->boxAlign() == BSTRETCH);
1580 bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inVerticalBox || !stretching);
1581
1582 Length logicalWidthLength = (treatAsReplaced) ? Length(computeReplacedLogicalWidth(), Fixed) : style()->logicalWidth();
1583
1584 RenderBlock* cb = containingBlock();
1585 int containerLogicalWidth = max(0, containingBlockLogicalWidthForContent());
1586 bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
1587 int containerWidthInInlineDirection = containerLogicalWidth;
1588 if (hasPerpendicularContainingBlock)
1589 containerWidthInInlineDirection = perpendicularContainingBlockLogicalHeight();
1590
1591 if (isInline() && !isInlineBlockOrInlineTable()) {
1592 // just calculate margins
1593 setMarginStart(style()->marginStart().calcMinValue(containerLogicalWidth));
1594 setMarginEnd(style()->marginEnd().calcMinValue(containerLogicalWidth));
1595 if (treatAsReplaced)
1596 setLogicalWidth(max(logicalWidthLength.value() + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth()));
1597 return;
1598 }
1599
1600 // Width calculations
1601 if (treatAsReplaced)
1602 setLogicalWidth(logicalWidthLength.value() + borderAndPaddingLogicalWidth());
1603 else {
1604 // Calculate LogicalWidth
1605 setLogicalWidth(computeLogicalWidthUsing(LogicalWidth, containerWidthInInlineDirection));
1606
1607 // Calculate MaxLogicalWidth
1608 if (!style()->logicalMaxWidth().isUndefined()) {
1609 int maxLogicalWidth = computeLogicalWidthUsing(MaxLogicalWidth, containerWidthInInlineDirection);
1610 if (logicalWidth() > maxLogicalWidth) {
1611 setLogicalWidth(maxLogicalWidth);
1612 logicalWidthLength = style()->logicalMaxWidth();
1613 }
1614 }
1615
1616 // Calculate MinLogicalWidth
1617 int minLogicalWidth = computeLogicalWidthUsing(MinLogicalWidth, containerWidthInInlineDirection);
1618 if (logicalWidth() < minLogicalWidth) {
1619 setLogicalWidth(minLogicalWidth);
1620 logicalWidthLength = style()->logicalMinWidth();
1621 }
1622 }
1623
1624 // Fieldsets are currently the only objects that stretch to their minimum width.
1625 if (stretchesToMinIntrinsicLogicalWidth()) {
1626 setLogicalWidth(max(logicalWidth(), minPreferredLogicalWidth()));
1627 logicalWidthLength = Length(logicalWidth(), Fixed);
1628 }
1629
1630 // Margin calculations.
1631 if (logicalWidthLength.isAuto() || hasPerpendicularContainingBlock || isFloating() || isInline()) {
1632 setMarginStart(style()->marginStart().calcMinValue(containerLogicalWidth));
1633 setMarginEnd(style()->marginEnd().calcMinValue(containerLogicalWidth));
1634 } else
1635 computeInlineDirectionMargins(cb, containerLogicalWidth, logicalWidth());
1636
1637 if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (logicalWidth() + marginStart() + marginEnd())
1638 && !isFloating() && !isInline() && !cb->isFlexibleBox())
1639 cb->setMarginEndForChild(this, containerLogicalWidth - logicalWidth() - cb->marginStartForChild(this));
1640 }
1641
computeLogicalWidthUsing(LogicalWidthType widthType,int availableLogicalWidth)1642 int RenderBox::computeLogicalWidthUsing(LogicalWidthType widthType, int availableLogicalWidth)
1643 {
1644 int logicalWidthResult = logicalWidth();
1645 Length logicalWidth;
1646 if (widthType == LogicalWidth)
1647 logicalWidth = style()->logicalWidth();
1648 else if (widthType == MinLogicalWidth)
1649 logicalWidth = style()->logicalMinWidth();
1650 else
1651 logicalWidth = style()->logicalMaxWidth();
1652
1653 if (logicalWidth.isIntrinsicOrAuto()) {
1654 int marginStart = style()->marginStart().calcMinValue(availableLogicalWidth);
1655 int marginEnd = style()->marginEnd().calcMinValue(availableLogicalWidth);
1656 if (availableLogicalWidth)
1657 logicalWidthResult = availableLogicalWidth - marginStart - marginEnd;
1658
1659 if (sizesToIntrinsicLogicalWidth(widthType)) {
1660 logicalWidthResult = max(logicalWidthResult, minPreferredLogicalWidth());
1661 logicalWidthResult = min(logicalWidthResult, maxPreferredLogicalWidth());
1662 }
1663 } else // FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
1664 logicalWidthResult = computeBorderBoxLogicalWidth(logicalWidth.calcValue(availableLogicalWidth));
1665
1666 return logicalWidthResult;
1667 }
1668
sizesToIntrinsicLogicalWidth(LogicalWidthType widthType) const1669 bool RenderBox::sizesToIntrinsicLogicalWidth(LogicalWidthType widthType) const
1670 {
1671 // Marquees in WinIE are like a mixture of blocks and inline-blocks. They size as though they're blocks,
1672 // but they allow text to sit on the same line as the marquee.
1673 if (isFloating() || (isInlineBlockOrInlineTable() && !isHTMLMarquee()))
1674 return true;
1675
1676 // This code may look a bit strange. Basically width:intrinsic should clamp the size when testing both
1677 // min-width and width. max-width is only clamped if it is also intrinsic.
1678 Length logicalWidth = (widthType == MaxLogicalWidth) ? style()->logicalMaxWidth() : style()->logicalWidth();
1679 if (logicalWidth.type() == Intrinsic)
1680 return true;
1681
1682 // Children of a horizontal marquee do not fill the container by default.
1683 // FIXME: Need to deal with MAUTO value properly. It could be vertical.
1684 // FIXME: Think about block-flow here. Need to find out how marquee direction relates to
1685 // block-flow (as well as how marquee overflow should relate to block flow).
1686 // https://bugs.webkit.org/show_bug.cgi?id=46472
1687 if (parent()->style()->overflowX() == OMARQUEE) {
1688 EMarqueeDirection dir = parent()->style()->marqueeDirection();
1689 if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
1690 return true;
1691 }
1692
1693 // Flexible horizontal boxes lay out children at their intrinsic widths. Also vertical boxes
1694 // that don't stretch their kids lay out their children at their intrinsic widths.
1695 // FIXME: Think about block-flow here.
1696 // https://bugs.webkit.org/show_bug.cgi?id=46473
1697 if (parent()->isFlexibleBox()
1698 && (parent()->style()->boxOrient() == HORIZONTAL || parent()->style()->boxAlign() != BSTRETCH))
1699 return true;
1700
1701 // Button, input, select, textarea, and legend treat
1702 // width value of 'auto' as 'intrinsic' unless it's in a
1703 // stretching vertical flexbox.
1704 // FIXME: Think about block-flow here.
1705 // https://bugs.webkit.org/show_bug.cgi?id=46473
1706 if (logicalWidth.type() == Auto && !(parent()->isFlexibleBox() && parent()->style()->boxOrient() == VERTICAL && parent()->style()->boxAlign() == BSTRETCH) && node() && (node()->hasTagName(inputTag) || node()->hasTagName(selectTag) || node()->hasTagName(buttonTag) || node()->hasTagName(textareaTag) || node()->hasTagName(legendTag)))
1707 return true;
1708
1709 return false;
1710 }
1711
computeInlineDirectionMargins(RenderBlock * containingBlock,int containerWidth,int childWidth)1712 void RenderBox::computeInlineDirectionMargins(RenderBlock* containingBlock, int containerWidth, int childWidth)
1713 {
1714 const RenderStyle* containingBlockStyle = containingBlock->style();
1715 Length marginStartLength = style()->marginStartUsing(containingBlockStyle);
1716 Length marginEndLength = style()->marginEndUsing(containingBlockStyle);
1717
1718 // Case One: The object is being centered in the containing block's available logical width.
1719 if ((marginStartLength.isAuto() && marginEndLength.isAuto() && childWidth < containerWidth)
1720 || (!marginStartLength.isAuto() && !marginEndLength.isAuto() && containingBlock->style()->textAlign() == WEBKIT_CENTER)) {
1721 containingBlock->setMarginStartForChild(this, max(0, (containerWidth - childWidth) / 2));
1722 containingBlock->setMarginEndForChild(this, containerWidth - childWidth - containingBlock->marginStartForChild(this));
1723 return;
1724 }
1725
1726 // Case Two: The object is being pushed to the start of the containing block's available logical width.
1727 if (marginEndLength.isAuto() && childWidth < containerWidth) {
1728 containingBlock->setMarginStartForChild(this, marginStartLength.calcValue(containerWidth));
1729 containingBlock->setMarginEndForChild(this, containerWidth - childWidth - containingBlock->marginStartForChild(this));
1730 return;
1731 }
1732
1733 // Case Three: The object is being pushed to the end of the containing block's available logical width.
1734 bool pushToEndFromTextAlign = !marginEndLength.isAuto() && ((!containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_LEFT)
1735 || (containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_RIGHT));
1736 if ((marginStartLength.isAuto() && childWidth < containerWidth) || pushToEndFromTextAlign) {
1737 containingBlock->setMarginEndForChild(this, marginEndLength.calcValue(containerWidth));
1738 containingBlock->setMarginStartForChild(this, containerWidth - childWidth - containingBlock->marginEndForChild(this));
1739 return;
1740 }
1741
1742 // Case Four: Either no auto margins, or our width is >= the container width (css2.1, 10.3.3). In that case
1743 // auto margins will just turn into 0.
1744 containingBlock->setMarginStartForChild(this, marginStartLength.calcMinValue(containerWidth));
1745 containingBlock->setMarginEndForChild(this, marginEndLength.calcMinValue(containerWidth));
1746 }
1747
computeLogicalHeight()1748 void RenderBox::computeLogicalHeight()
1749 {
1750 // Cell height is managed by the table and inline non-replaced elements do not support a height property.
1751 if (isTableCell() || (isInline() && !isReplaced()))
1752 return;
1753
1754 Length h;
1755 if (isPositioned()) {
1756 // FIXME: This calculation is not patched for block-flow yet.
1757 // https://bugs.webkit.org/show_bug.cgi?id=46500
1758 computePositionedLogicalHeight();
1759 } else {
1760 RenderBlock* cb = containingBlock();
1761 bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
1762
1763 if (!hasPerpendicularContainingBlock)
1764 computeBlockDirectionMargins(cb);
1765
1766 // For tables, calculate margins only.
1767 if (isTable()) {
1768 if (hasPerpendicularContainingBlock)
1769 computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), logicalHeight());
1770 return;
1771 }
1772
1773 // FIXME: Account for block-flow in flexible boxes.
1774 // https://bugs.webkit.org/show_bug.cgi?id=46418
1775 bool inHorizontalBox = parent()->isFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL;
1776 bool stretching = parent()->style()->boxAlign() == BSTRETCH;
1777 bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inHorizontalBox || !stretching);
1778 bool checkMinMaxHeight = false;
1779
1780 // The parent box is flexing us, so it has increased or decreased our height. We have to
1781 // grab our cached flexible height.
1782 // FIXME: Account for block-flow in flexible boxes.
1783 // https://bugs.webkit.org/show_bug.cgi?id=46418
1784 if (hasOverrideSize() && parent()->isFlexibleBox() && parent()->style()->boxOrient() == VERTICAL
1785 && parent()->isFlexingChildren())
1786 h = Length(overrideSize() - borderAndPaddingLogicalHeight(), Fixed);
1787 else if (treatAsReplaced)
1788 h = Length(computeReplacedLogicalHeight(), Fixed);
1789 else {
1790 h = style()->logicalHeight();
1791 checkMinMaxHeight = true;
1792 }
1793
1794 // Block children of horizontal flexible boxes fill the height of the box.
1795 // FIXME: Account for block-flow in flexible boxes.
1796 // https://bugs.webkit.org/show_bug.cgi?id=46418
1797 if (h.isAuto() && parent()->isFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL
1798 && parent()->isStretchingChildren()) {
1799 h = Length(parentBox()->contentLogicalHeight() - marginBefore() - marginAfter() - borderAndPaddingLogicalHeight(), Fixed);
1800 checkMinMaxHeight = false;
1801 }
1802
1803 int heightResult;
1804 if (checkMinMaxHeight) {
1805 heightResult = computeLogicalHeightUsing(style()->logicalHeight());
1806 if (heightResult == -1)
1807 heightResult = logicalHeight();
1808 int minH = computeLogicalHeightUsing(style()->logicalMinHeight()); // Leave as -1 if unset.
1809 int maxH = style()->logicalMaxHeight().isUndefined() ? heightResult : computeLogicalHeightUsing(style()->logicalMaxHeight());
1810 if (maxH == -1)
1811 maxH = heightResult;
1812 heightResult = min(maxH, heightResult);
1813 heightResult = max(minH, heightResult);
1814 } else {
1815 // The only times we don't check min/max height are when a fixed length has
1816 // been given as an override. Just use that. The value has already been adjusted
1817 // for box-sizing.
1818 heightResult = h.value() + borderAndPaddingLogicalHeight();
1819 }
1820
1821 setLogicalHeight(heightResult);
1822
1823 if (hasPerpendicularContainingBlock)
1824 computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), heightResult);
1825 }
1826
1827 // WinIE quirk: The <html> block always fills the entire canvas in quirks mode. The <body> always fills the
1828 // <html> block in quirks mode. Only apply this quirk if the block is normal flow and no height
1829 // is specified. When we're printing, we also need this quirk if the body or root has a percentage
1830 // height since we don't set a height in RenderView when we're printing. So without this quirk, the
1831 // height has nothing to be a percentage of, and it ends up being 0. That is bad.
1832 bool paginatedContentNeedsBaseHeight = document()->printing() && h.isPercent()
1833 && (isRoot() || (isBody() && document()->documentElement()->renderer()->style()->logicalHeight().isPercent()));
1834 if (stretchesToViewport() || paginatedContentNeedsBaseHeight) {
1835 // FIXME: Finish accounting for block flow here.
1836 // https://bugs.webkit.org/show_bug.cgi?id=46603
1837 int margins = collapsedMarginBefore() + collapsedMarginAfter();
1838 int visHeight;
1839 if (document()->printing())
1840 visHeight = static_cast<int>(view()->pageLogicalHeight());
1841 else {
1842 if (isHorizontalWritingMode())
1843 visHeight = view()->viewHeight();
1844 else
1845 visHeight = view()->viewWidth();
1846 }
1847 if (isRoot())
1848 setLogicalHeight(max(logicalHeight(), visHeight - margins));
1849 else {
1850 int marginsBordersPadding = margins + parentBox()->marginBefore() + parentBox()->marginAfter() + parentBox()->borderAndPaddingLogicalHeight();
1851 setLogicalHeight(max(logicalHeight(), visHeight - marginsBordersPadding));
1852 }
1853 }
1854 }
1855
computeLogicalHeightUsing(const Length & h)1856 int RenderBox::computeLogicalHeightUsing(const Length& h)
1857 {
1858 int logicalHeight = -1;
1859 if (!h.isAuto()) {
1860 if (h.isFixed())
1861 logicalHeight = h.value();
1862 else if (h.isPercent())
1863 logicalHeight = computePercentageLogicalHeight(h);
1864 if (logicalHeight != -1) {
1865 logicalHeight = computeBorderBoxLogicalHeight(logicalHeight);
1866 return logicalHeight;
1867 }
1868 }
1869 return logicalHeight;
1870 }
1871
computePercentageLogicalHeight(const Length & height)1872 int RenderBox::computePercentageLogicalHeight(const Length& height)
1873 {
1874 int result = -1;
1875
1876 // In quirks mode, blocks with auto height are skipped, and we keep looking for an enclosing
1877 // block that may have a specified height and then use it. In strict mode, this violates the
1878 // specification, which states that percentage heights just revert to auto if the containing
1879 // block has an auto height. We still skip anonymous containing blocks in both modes, though, and look
1880 // only at explicit containers.
1881 bool skippedAutoHeightContainingBlock = false;
1882 RenderBlock* cb = containingBlock();
1883 while (!cb->isRenderView() && !cb->isBody() && !cb->isTableCell() && !cb->isPositioned() && cb->style()->logicalHeight().isAuto()) {
1884 if (!document()->inQuirksMode() && !cb->isAnonymousBlock())
1885 break;
1886 skippedAutoHeightContainingBlock = true;
1887 cb = cb->containingBlock();
1888 cb->addPercentHeightDescendant(this);
1889 }
1890
1891 // A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
1892 // explicitly specified that can be used for any percentage computations.
1893 // FIXME: We can't just check top/bottom here.
1894 // https://bugs.webkit.org/show_bug.cgi?id=46500
1895 bool isPositionedWithSpecifiedHeight = cb->isPositioned() && (!cb->style()->logicalHeight().isAuto() || (!cb->style()->top().isAuto() && !cb->style()->bottom().isAuto()));
1896
1897 bool includeBorderPadding = isTable();
1898
1899 // Table cells violate what the CSS spec says to do with heights. Basically we
1900 // don't care if the cell specified a height or not. We just always make ourselves
1901 // be a percentage of the cell's current content height.
1902 if (cb->isTableCell()) {
1903 if (!skippedAutoHeightContainingBlock) {
1904 result = cb->overrideSize();
1905 if (result == -1) {
1906 // Normally we would let the cell size intrinsically, but scrolling overflow has to be
1907 // treated differently, since WinIE lets scrolled overflow regions shrink as needed.
1908 // While we can't get all cases right, we can at least detect when the cell has a specified
1909 // height or when the table has a specified height. In these cases we want to initially have
1910 // no size and allow the flexing of the table or the cell to its specified height to cause us
1911 // to grow to fill the space. This could end up being wrong in some cases, but it is
1912 // preferable to the alternative (sizing intrinsically and making the row end up too big).
1913 RenderTableCell* cell = toRenderTableCell(cb);
1914 if (scrollsOverflowY() && (!cell->style()->logicalHeight().isAuto() || !cell->table()->style()->logicalHeight().isAuto()))
1915 return 0;
1916 return -1;
1917 }
1918 includeBorderPadding = true;
1919 }
1920 }
1921 // Otherwise we only use our percentage height if our containing block had a specified
1922 // height.
1923 else if (cb->style()->logicalHeight().isFixed())
1924 result = cb->computeContentBoxLogicalHeight(cb->style()->logicalHeight().value());
1925 else if (cb->style()->logicalHeight().isPercent() && !isPositionedWithSpecifiedHeight) {
1926 // We need to recur and compute the percentage height for our containing block.
1927 result = cb->computePercentageLogicalHeight(cb->style()->logicalHeight());
1928 if (result != -1)
1929 result = cb->computeContentBoxLogicalHeight(result);
1930 } else if (cb->isRenderView() || (cb->isBody() && document()->inQuirksMode()) || isPositionedWithSpecifiedHeight) {
1931 // Don't allow this to affect the block' height() member variable, since this
1932 // can get called while the block is still laying out its kids.
1933 int oldHeight = cb->logicalHeight();
1934 cb->computeLogicalHeight();
1935 result = cb->contentLogicalHeight();
1936 cb->setLogicalHeight(oldHeight);
1937 } else if (cb->isRoot() && isPositioned())
1938 // Match the positioned objects behavior, which is that positioned objects will fill their viewport
1939 // always. Note we could only hit this case by recurring into computePercentageLogicalHeight on a positioned containing block.
1940 result = cb->computeContentBoxLogicalHeight(cb->availableLogicalHeight());
1941
1942 if (result != -1) {
1943 result = height.calcValue(result);
1944 if (includeBorderPadding) {
1945 // It is necessary to use the border-box to match WinIE's broken
1946 // box model. This is essential for sizing inside
1947 // table cells using percentage heights.
1948 result -= borderAndPaddingLogicalHeight();
1949 result = max(0, result);
1950 }
1951 }
1952 return result;
1953 }
1954
computeReplacedLogicalWidth(bool includeMaxWidth) const1955 int RenderBox::computeReplacedLogicalWidth(bool includeMaxWidth) const
1956 {
1957 int logicalWidth = computeReplacedLogicalWidthUsing(style()->logicalWidth());
1958 int minLogicalWidth = computeReplacedLogicalWidthUsing(style()->logicalMinWidth());
1959 int maxLogicalWidth = !includeMaxWidth || style()->logicalMaxWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth());
1960
1961 return max(minLogicalWidth, min(logicalWidth, maxLogicalWidth));
1962 }
1963
computeReplacedLogicalWidthUsing(Length logicalWidth) const1964 int RenderBox::computeReplacedLogicalWidthUsing(Length logicalWidth) const
1965 {
1966 switch (logicalWidth.type()) {
1967 case Fixed:
1968 return computeContentBoxLogicalWidth(logicalWidth.value());
1969 case Percent: {
1970 // FIXME: containingBlockLogicalWidthForContent() is wrong if the replaced element's block-flow is perpendicular to the
1971 // containing block's block-flow.
1972 // https://bugs.webkit.org/show_bug.cgi?id=46496
1973 const int cw = isPositioned() ? containingBlockLogicalWidthForPositioned(toRenderBoxModelObject(container())) : containingBlockLogicalWidthForContent();
1974 if (cw > 0)
1975 return computeContentBoxLogicalWidth(logicalWidth.calcMinValue(cw));
1976 }
1977 // fall through
1978 default:
1979 return intrinsicLogicalWidth();
1980 }
1981 }
1982
computeReplacedLogicalHeight() const1983 int RenderBox::computeReplacedLogicalHeight() const
1984 {
1985 int logicalHeight = computeReplacedLogicalHeightUsing(style()->logicalHeight());
1986 int minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight());
1987 int maxLogicalHeight = style()->logicalMaxHeight().isUndefined() ? logicalHeight : computeReplacedLogicalHeightUsing(style()->logicalMaxHeight());
1988
1989 return max(minLogicalHeight, min(logicalHeight, maxLogicalHeight));
1990 }
1991
computeReplacedLogicalHeightUsing(Length logicalHeight) const1992 int RenderBox::computeReplacedLogicalHeightUsing(Length logicalHeight) const
1993 {
1994 switch (logicalHeight.type()) {
1995 case Fixed:
1996 return computeContentBoxLogicalHeight(logicalHeight.value());
1997 case Percent:
1998 {
1999 RenderObject* cb = isPositioned() ? container() : containingBlock();
2000 while (cb->isAnonymous()) {
2001 cb = cb->containingBlock();
2002 toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
2003 }
2004
2005 // FIXME: This calculation is not patched for block-flow yet.
2006 // https://bugs.webkit.org/show_bug.cgi?id=46500
2007 if (cb->isPositioned() && cb->style()->height().isAuto() && !(cb->style()->top().isAuto() || cb->style()->bottom().isAuto())) {
2008 ASSERT(cb->isRenderBlock());
2009 RenderBlock* block = toRenderBlock(cb);
2010 int oldHeight = block->height();
2011 block->computeLogicalHeight();
2012 int newHeight = block->computeContentBoxLogicalHeight(block->contentHeight());
2013 block->setHeight(oldHeight);
2014 return computeContentBoxLogicalHeight(logicalHeight.calcValue(newHeight));
2015 }
2016
2017 // FIXME: availableLogicalHeight() is wrong if the replaced element's block-flow is perpendicular to the
2018 // containing block's block-flow.
2019 // https://bugs.webkit.org/show_bug.cgi?id=46496
2020 int availableHeight = isPositioned() ? containingBlockLogicalHeightForPositioned(toRenderBoxModelObject(cb)) : toRenderBox(cb)->availableLogicalHeight();
2021
2022 // It is necessary to use the border-box to match WinIE's broken
2023 // box model. This is essential for sizing inside
2024 // table cells using percentage heights.
2025 // FIXME: This needs to be made block-flow-aware. If the cell and image are perpendicular block-flows, this isn't right.
2026 // https://bugs.webkit.org/show_bug.cgi?id=46997
2027 while (cb && !cb->isRenderView() && (cb->style()->logicalHeight().isAuto() || cb->style()->logicalHeight().isPercent())) {
2028 if (cb->isTableCell()) {
2029 // Don't let table cells squeeze percent-height replaced elements
2030 // <http://bugs.webkit.org/show_bug.cgi?id=15359>
2031 availableHeight = max(availableHeight, intrinsicLogicalHeight());
2032 return logicalHeight.calcValue(availableHeight - borderAndPaddingLogicalHeight());
2033 }
2034 cb = cb->containingBlock();
2035 }
2036
2037 return computeContentBoxLogicalHeight(logicalHeight.calcValue(availableHeight));
2038 }
2039 default:
2040 return intrinsicLogicalHeight();
2041 }
2042 }
2043
availableLogicalHeight() const2044 int RenderBox::availableLogicalHeight() const
2045 {
2046 return availableLogicalHeightUsing(style()->logicalHeight());
2047 }
2048
availableLogicalHeightUsing(const Length & h) const2049 int RenderBox::availableLogicalHeightUsing(const Length& h) const
2050 {
2051 if (h.isFixed())
2052 return computeContentBoxLogicalHeight(h.value());
2053
2054 if (isRenderView())
2055 return isHorizontalWritingMode() ? toRenderView(this)->frameView()->visibleHeight() : toRenderView(this)->frameView()->visibleWidth();
2056
2057 // We need to stop here, since we don't want to increase the height of the table
2058 // artificially. We're going to rely on this cell getting expanded to some new
2059 // height, and then when we lay out again we'll use the calculation below.
2060 if (isTableCell() && (h.isAuto() || h.isPercent()))
2061 return overrideSize() - borderAndPaddingLogicalWidth();
2062
2063 if (h.isPercent())
2064 return computeContentBoxLogicalHeight(h.calcValue(containingBlock()->availableLogicalHeight()));
2065
2066 // FIXME: We can't just check top/bottom here.
2067 // https://bugs.webkit.org/show_bug.cgi?id=46500
2068 if (isRenderBlock() && isPositioned() && style()->height().isAuto() && !(style()->top().isAuto() || style()->bottom().isAuto())) {
2069 RenderBlock* block = const_cast<RenderBlock*>(toRenderBlock(this));
2070 int oldHeight = block->logicalHeight();
2071 block->computeLogicalHeight();
2072 int newHeight = block->computeContentBoxLogicalHeight(block->contentLogicalHeight());
2073 block->setLogicalHeight(oldHeight);
2074 return computeContentBoxLogicalHeight(newHeight);
2075 }
2076
2077 return containingBlock()->availableLogicalHeight();
2078 }
2079
computeBlockDirectionMargins(RenderBlock * containingBlock)2080 void RenderBox::computeBlockDirectionMargins(RenderBlock* containingBlock)
2081 {
2082 if (isTableCell()) {
2083 // FIXME: Not right if we allow cells to have different directionality than the table. If we do allow this, though,
2084 // we may just do it with an extra anonymous block inside the cell.
2085 setMarginBefore(0);
2086 setMarginAfter(0);
2087 return;
2088 }
2089
2090 // Margins are calculated with respect to the logical width of
2091 // the containing block (8.3)
2092 int cw = containingBlockLogicalWidthForContent();
2093
2094 RenderStyle* containingBlockStyle = containingBlock->style();
2095 containingBlock->setMarginBeforeForChild(this, style()->marginBeforeUsing(containingBlockStyle).calcMinValue(cw));
2096 containingBlock->setMarginAfterForChild(this, style()->marginAfterUsing(containingBlockStyle).calcMinValue(cw));
2097 }
2098
containingBlockLogicalWidthForPositioned(const RenderBoxModelObject * containingBlock,bool checkForPerpendicularWritingMode) const2099 int RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
2100 {
2101 if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
2102 return containingBlockLogicalHeightForPositioned(containingBlock, false);
2103
2104 if (containingBlock->isBox())
2105 return toRenderBox(containingBlock)->clientLogicalWidth();
2106
2107 ASSERT(containingBlock->isRenderInline() && containingBlock->isRelPositioned());
2108
2109 const RenderInline* flow = toRenderInline(containingBlock);
2110 InlineFlowBox* first = flow->firstLineBox();
2111 InlineFlowBox* last = flow->lastLineBox();
2112
2113 // If the containing block is empty, return a width of 0.
2114 if (!first || !last)
2115 return 0;
2116
2117 int fromLeft;
2118 int fromRight;
2119 if (containingBlock->style()->isLeftToRightDirection()) {
2120 fromLeft = first->logicalLeft() + first->borderLogicalLeft();
2121 fromRight = last->logicalLeft() + last->logicalWidth() - last->borderLogicalRight();
2122 } else {
2123 fromRight = first->logicalLeft() + first->logicalWidth() - first->borderLogicalRight();
2124 fromLeft = last->logicalLeft() + last->borderLogicalLeft();
2125 }
2126
2127 return max(0, (fromRight - fromLeft));
2128 }
2129
containingBlockLogicalHeightForPositioned(const RenderBoxModelObject * containingBlock,bool checkForPerpendicularWritingMode) const2130 int RenderBox::containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
2131 {
2132 if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
2133 return containingBlockLogicalWidthForPositioned(containingBlock, false);
2134
2135 if (containingBlock->isBox())
2136 return toRenderBox(containingBlock)->clientLogicalHeight();
2137
2138 ASSERT(containingBlock->isRenderInline() && containingBlock->isRelPositioned());
2139
2140 const RenderInline* flow = toRenderInline(containingBlock);
2141 InlineFlowBox* first = flow->firstLineBox();
2142 InlineFlowBox* last = flow->lastLineBox();
2143
2144 // If the containing block is empty, return a height of 0.
2145 if (!first || !last)
2146 return 0;
2147
2148 int heightResult;
2149 IntRect boundingBox = flow->linesBoundingBox();
2150 if (containingBlock->isHorizontalWritingMode())
2151 heightResult = boundingBox.height();
2152 else
2153 heightResult = boundingBox.width();
2154 heightResult -= (containingBlock->borderBefore() + containingBlock->borderAfter());
2155 return heightResult;
2156 }
2157
computeInlineStaticDistance(Length & logicalLeft,Length & logicalRight,const RenderBox * child,const RenderBoxModelObject * containerBlock,int containerLogicalWidth,TextDirection containerDirection)2158 static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, int containerLogicalWidth,
2159 TextDirection containerDirection)
2160 {
2161 if (!logicalLeft.isAuto() || !logicalRight.isAuto())
2162 return;
2163
2164 // FIXME: The static distance computation has not been patched for mixed writing modes yet.
2165 if (containerDirection == LTR) {
2166 int staticPosition = child->layer()->staticInlinePosition() - containerBlock->borderLogicalLeft();
2167 for (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
2168 if (curr->isBox())
2169 staticPosition += toRenderBox(curr)->logicalLeft();
2170 }
2171 logicalLeft.setValue(Fixed, staticPosition);
2172 } else {
2173 RenderBox* enclosingBox = child->parent()->enclosingBox();
2174 int staticPosition = child->layer()->staticInlinePosition() + containerLogicalWidth + containerBlock->borderLogicalRight();
2175 staticPosition -= enclosingBox->logicalWidth();
2176 for (RenderObject* curr = enclosingBox; curr && curr != containerBlock; curr = curr->container()) {
2177 if (curr->isBox())
2178 staticPosition -= toRenderBox(curr)->logicalLeft();
2179 }
2180 logicalRight.setValue(Fixed, staticPosition);
2181 }
2182 }
2183
computePositionedLogicalWidth()2184 void RenderBox::computePositionedLogicalWidth()
2185 {
2186 if (isReplaced()) {
2187 computePositionedLogicalWidthReplaced();
2188 return;
2189 }
2190
2191 // QUESTIONS
2192 // FIXME 1: Which RenderObject's 'direction' property should used: the
2193 // containing block (cb) as the spec seems to imply, the parent (parent()) as
2194 // was previously done in calculating the static distances, or ourself, which
2195 // was also previously done for deciding what to override when you had
2196 // over-constrained margins? Also note that the container block is used
2197 // in similar situations in other parts of the RenderBox class (see computeLogicalWidth()
2198 // and computeMarginsInContainingBlockInlineDirection()). For now we are using the parent for quirks
2199 // mode and the containing block for strict mode.
2200
2201 // FIXME 2: Should we still deal with these the cases of 'left' or 'right' having
2202 // the type 'static' in determining whether to calculate the static distance?
2203 // NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
2204
2205 // FIXME 3: Can perhaps optimize out cases when max-width/min-width are greater
2206 // than or less than the computed width(). Be careful of box-sizing and
2207 // percentage issues.
2208
2209 // The following is based off of the W3C Working Draft from April 11, 2006 of
2210 // CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
2211 // <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
2212 // (block-style-comments in this function and in computePositionedLogicalWidthUsing()
2213 // correspond to text from the spec)
2214
2215
2216 // We don't use containingBlock(), since we may be positioned by an enclosing
2217 // relative positioned inline.
2218 const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
2219
2220 const int containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
2221
2222 // To match WinIE, in quirks mode use the parent's 'direction' property
2223 // instead of the the container block's.
2224 TextDirection containerDirection = (document()->inQuirksMode()) ? parent()->style()->direction() : containerBlock->style()->direction();
2225
2226 bool isHorizontal = isHorizontalWritingMode();
2227 const int bordersPlusPadding = borderAndPaddingLogicalWidth();
2228 const Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
2229 const Length marginLogicalRight = isHorizontal ? style()->marginRight() : style()->marginBottom();
2230 int& marginLogicalLeftAlias = isHorizontal ? m_marginLeft : m_marginTop;
2231 int& marginLogicalRightAlias = isHorizontal ? m_marginRight : m_marginBottom;
2232
2233 Length logicalLeft = style()->logicalLeft();
2234 Length logicalRight = style()->logicalRight();
2235
2236 /*---------------------------------------------------------------------------*\
2237 * For the purposes of this section and the next, the term "static position"
2238 * (of an element) refers, roughly, to the position an element would have had
2239 * in the normal flow. More precisely:
2240 *
2241 * * The static position for 'left' is the distance from the left edge of the
2242 * containing block to the left margin edge of a hypothetical box that would
2243 * have been the first box of the element if its 'position' property had
2244 * been 'static' and 'float' had been 'none'. The value is negative if the
2245 * hypothetical box is to the left of the containing block.
2246 * * The static position for 'right' is the distance from the right edge of the
2247 * containing block to the right margin edge of the same hypothetical box as
2248 * above. The value is positive if the hypothetical box is to the left of the
2249 * containing block's edge.
2250 *
2251 * But rather than actually calculating the dimensions of that hypothetical box,
2252 * user agents are free to make a guess at its probable position.
2253 *
2254 * For the purposes of calculating the static position, the containing block of
2255 * fixed positioned elements is the initial containing block instead of the
2256 * viewport, and all scrollable boxes should be assumed to be scrolled to their
2257 * origin.
2258 \*---------------------------------------------------------------------------*/
2259
2260 // see FIXME 2
2261 // Calculate the static distance if needed.
2262 computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth, containerDirection);
2263
2264 // Calculate constraint equation values for 'width' case.
2265 int logicalWidthResult;
2266 int logicalLeftResult;
2267 computePositionedLogicalWidthUsing(style()->logicalWidth(), containerBlock, containerDirection,
2268 containerLogicalWidth, bordersPlusPadding,
2269 logicalLeft, logicalRight, marginLogicalLeft, marginLogicalRight,
2270 logicalWidthResult, marginLogicalLeftAlias, marginLogicalRightAlias, logicalLeftResult);
2271 setLogicalWidth(logicalWidthResult);
2272 setLogicalLeft(logicalLeftResult);
2273
2274 // Calculate constraint equation values for 'max-width' case.
2275 if (!style()->logicalMaxWidth().isUndefined()) {
2276 int maxLogicalWidth;
2277 int maxMarginLogicalLeft;
2278 int maxMarginLogicalRight;
2279 int maxLogicalLeftPos;
2280
2281 computePositionedLogicalWidthUsing(style()->logicalMaxWidth(), containerBlock, containerDirection,
2282 containerLogicalWidth, bordersPlusPadding,
2283 logicalLeft, logicalRight, marginLogicalLeft, marginLogicalRight,
2284 maxLogicalWidth, maxMarginLogicalLeft, maxMarginLogicalRight, maxLogicalLeftPos);
2285
2286 if (logicalWidth() > maxLogicalWidth) {
2287 setLogicalWidth(maxLogicalWidth);
2288 marginLogicalLeftAlias = maxMarginLogicalLeft;
2289 marginLogicalRightAlias = maxMarginLogicalRight;
2290 setLogicalLeft(maxLogicalLeftPos);
2291 }
2292 }
2293
2294 // Calculate constraint equation values for 'min-width' case.
2295 if (!style()->logicalMinWidth().isZero()) {
2296 int minLogicalWidth;
2297 int minMarginLogicalLeft;
2298 int minMarginLogicalRight;
2299 int minLogicalLeftPos;
2300
2301 computePositionedLogicalWidthUsing(style()->logicalMinWidth(), containerBlock, containerDirection,
2302 containerLogicalWidth, bordersPlusPadding,
2303 logicalLeft, logicalRight, marginLogicalLeft, marginLogicalRight,
2304 minLogicalWidth, minMarginLogicalLeft, minMarginLogicalRight, minLogicalLeftPos);
2305
2306 if (logicalWidth() < minLogicalWidth) {
2307 setLogicalWidth(minLogicalWidth);
2308 marginLogicalLeftAlias = minMarginLogicalLeft;
2309 marginLogicalRightAlias = minMarginLogicalRight;
2310 setLogicalLeft(minLogicalLeftPos);
2311 }
2312 }
2313
2314 if (stretchesToMinIntrinsicLogicalWidth() && logicalWidth() < minPreferredLogicalWidth() - bordersPlusPadding) {
2315 computePositionedLogicalWidthUsing(Length(minPreferredLogicalWidth() - bordersPlusPadding, Fixed), containerBlock, containerDirection,
2316 containerLogicalWidth, bordersPlusPadding,
2317 logicalLeft, logicalRight, marginLogicalLeft, marginLogicalRight,
2318 logicalWidthResult, marginLogicalLeftAlias, marginLogicalRightAlias, logicalLeftResult);
2319 setLogicalWidth(logicalWidthResult);
2320 setLogicalLeft(logicalLeftResult);
2321 }
2322
2323 // Put logicalWidth() into correct form.
2324 setLogicalWidth(logicalWidth() + bordersPlusPadding);
2325 }
2326
computeLogicalLeftPositionedOffset(int & logicalLeftPos,const RenderBox * child,int logicalWidthValue,const RenderBoxModelObject * containerBlock,int containerLogicalWidth)2327 static void computeLogicalLeftPositionedOffset(int& logicalLeftPos, const RenderBox* child, int logicalWidthValue, const RenderBoxModelObject* containerBlock, int containerLogicalWidth)
2328 {
2329 // Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
2330 // along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
2331 if (containerBlock->isHorizontalWritingMode() != child->isHorizontalWritingMode() && containerBlock->style()->isFlippedBlocksWritingMode()) {
2332 logicalLeftPos = containerLogicalWidth - logicalWidthValue - logicalLeftPos;
2333 logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderRight() : containerBlock->borderBottom());
2334 } else
2335 logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderLeft() : containerBlock->borderTop());
2336 }
2337
computePositionedLogicalWidthUsing(Length logicalWidth,const RenderBoxModelObject * containerBlock,TextDirection containerDirection,int containerLogicalWidth,int bordersPlusPadding,Length logicalLeft,Length logicalRight,Length marginLogicalLeft,Length marginLogicalRight,int & logicalWidthValue,int & marginLogicalLeftValue,int & marginLogicalRightValue,int & logicalLeftPos)2338 void RenderBox::computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
2339 int containerLogicalWidth, int bordersPlusPadding,
2340 Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
2341 int& logicalWidthValue, int& marginLogicalLeftValue, int& marginLogicalRightValue, int& logicalLeftPos)
2342 {
2343 // 'left' and 'right' cannot both be 'auto' because one would of been
2344 // converted to the static position already
2345 ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
2346
2347 int logicalLeftValue = 0;
2348
2349 bool logicalWidthIsAuto = logicalWidth.isIntrinsicOrAuto();
2350 bool logicalLeftIsAuto = logicalLeft.isAuto();
2351 bool logicalRightIsAuto = logicalRight.isAuto();
2352
2353 if (!logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
2354 /*-----------------------------------------------------------------------*\
2355 * If none of the three is 'auto': If both 'margin-left' and 'margin-
2356 * right' are 'auto', solve the equation under the extra constraint that
2357 * the two margins get equal values, unless this would make them negative,
2358 * in which case when direction of the containing block is 'ltr' ('rtl'),
2359 * set 'margin-left' ('margin-right') to zero and solve for 'margin-right'
2360 * ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto',
2361 * solve the equation for that value. If the values are over-constrained,
2362 * ignore the value for 'left' (in case the 'direction' property of the
2363 * containing block is 'rtl') or 'right' (in case 'direction' is 'ltr')
2364 * and solve for that value.
2365 \*-----------------------------------------------------------------------*/
2366 // NOTE: It is not necessary to solve for 'right' in the over constrained
2367 // case because the value is not used for any further calculations.
2368
2369 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2370 logicalWidthValue = computeContentBoxLogicalWidth(logicalWidth.calcValue(containerLogicalWidth));
2371
2372 const int availableSpace = containerLogicalWidth - (logicalLeftValue + logicalWidthValue + logicalRight.calcValue(containerLogicalWidth) + bordersPlusPadding);
2373
2374 // Margins are now the only unknown
2375 if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
2376 // Both margins auto, solve for equality
2377 if (availableSpace >= 0) {
2378 marginLogicalLeftValue = availableSpace / 2; // split the difference
2379 marginLogicalRightValue = availableSpace - marginLogicalLeftValue; // account for odd valued differences
2380 } else {
2381 // see FIXME 1
2382 if (containerDirection == LTR) {
2383 marginLogicalLeftValue = 0;
2384 marginLogicalRightValue = availableSpace; // will be negative
2385 } else {
2386 marginLogicalLeftValue = availableSpace; // will be negative
2387 marginLogicalRightValue = 0;
2388 }
2389 }
2390 } else if (marginLogicalLeft.isAuto()) {
2391 // Solve for left margin
2392 marginLogicalRightValue = marginLogicalRight.calcValue(containerLogicalWidth);
2393 marginLogicalLeftValue = availableSpace - marginLogicalRightValue;
2394 } else if (marginLogicalRight.isAuto()) {
2395 // Solve for right margin
2396 marginLogicalLeftValue = marginLogicalLeft.calcValue(containerLogicalWidth);
2397 marginLogicalRightValue = availableSpace - marginLogicalLeftValue;
2398 } else {
2399 // Over-constrained, solve for left if direction is RTL
2400 marginLogicalLeftValue = marginLogicalLeft.calcValue(containerLogicalWidth);
2401 marginLogicalRightValue = marginLogicalRight.calcValue(containerLogicalWidth);
2402
2403 // see FIXME 1 -- used to be "this->style()->direction()"
2404 if (containerDirection == RTL)
2405 logicalLeftValue = (availableSpace + logicalLeftValue) - marginLogicalLeftValue - marginLogicalRightValue;
2406 }
2407 } else {
2408 /*--------------------------------------------------------------------*\
2409 * Otherwise, set 'auto' values for 'margin-left' and 'margin-right'
2410 * to 0, and pick the one of the following six rules that applies.
2411 *
2412 * 1. 'left' and 'width' are 'auto' and 'right' is not 'auto', then the
2413 * width is shrink-to-fit. Then solve for 'left'
2414 *
2415 * OMIT RULE 2 AS IT SHOULD NEVER BE HIT
2416 * ------------------------------------------------------------------
2417 * 2. 'left' and 'right' are 'auto' and 'width' is not 'auto', then if
2418 * the 'direction' property of the containing block is 'ltr' set
2419 * 'left' to the static position, otherwise set 'right' to the
2420 * static position. Then solve for 'left' (if 'direction is 'rtl')
2421 * or 'right' (if 'direction' is 'ltr').
2422 * ------------------------------------------------------------------
2423 *
2424 * 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the
2425 * width is shrink-to-fit . Then solve for 'right'
2426 * 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve
2427 * for 'left'
2428 * 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve
2429 * for 'width'
2430 * 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve
2431 * for 'right'
2432 *
2433 * Calculation of the shrink-to-fit width is similar to calculating the
2434 * width of a table cell using the automatic table layout algorithm.
2435 * Roughly: calculate the preferred width by formatting the content
2436 * without breaking lines other than where explicit line breaks occur,
2437 * and also calculate the preferred minimum width, e.g., by trying all
2438 * possible line breaks. CSS 2.1 does not define the exact algorithm.
2439 * Thirdly, calculate the available width: this is found by solving
2440 * for 'width' after setting 'left' (in case 1) or 'right' (in case 3)
2441 * to 0.
2442 *
2443 * Then the shrink-to-fit width is:
2444 * min(max(preferred minimum width, available width), preferred width).
2445 \*--------------------------------------------------------------------*/
2446 // NOTE: For rules 3 and 6 it is not necessary to solve for 'right'
2447 // because the value is not used for any further calculations.
2448
2449 // Calculate margins, 'auto' margins are ignored.
2450 marginLogicalLeftValue = marginLogicalLeft.calcMinValue(containerLogicalWidth);
2451 marginLogicalRightValue = marginLogicalRight.calcMinValue(containerLogicalWidth);
2452
2453 const int availableSpace = containerLogicalWidth - (marginLogicalLeftValue + marginLogicalRightValue + bordersPlusPadding);
2454
2455 // FIXME: Is there a faster way to find the correct case?
2456 // Use rule/case that applies.
2457 if (logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
2458 // RULE 1: (use shrink-to-fit for width, and solve of left)
2459 int logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2460
2461 // FIXME: would it be better to have shrink-to-fit in one step?
2462 int preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
2463 int preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
2464 int availableWidth = availableSpace - logicalRightValue;
2465 logicalWidthValue = min(max(preferredMinWidth, availableWidth), preferredWidth);
2466 logicalLeftValue = availableSpace - (logicalWidthValue + logicalRightValue);
2467 } else if (!logicalLeftIsAuto && logicalWidthIsAuto && logicalRightIsAuto) {
2468 // RULE 3: (use shrink-to-fit for width, and no need solve of right)
2469 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2470
2471 // FIXME: would it be better to have shrink-to-fit in one step?
2472 int preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
2473 int preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
2474 int availableWidth = availableSpace - logicalLeftValue;
2475 logicalWidthValue = min(max(preferredMinWidth, availableWidth), preferredWidth);
2476 } else if (logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
2477 // RULE 4: (solve for left)
2478 logicalWidthValue = computeContentBoxLogicalWidth(logicalWidth.calcValue(containerLogicalWidth));
2479 logicalLeftValue = availableSpace - (logicalWidthValue + logicalRight.calcValue(containerLogicalWidth));
2480 } else if (!logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
2481 // RULE 5: (solve for width)
2482 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2483 logicalWidthValue = availableSpace - (logicalLeftValue + logicalRight.calcValue(containerLogicalWidth));
2484 } else if (!logicalLeftIsAuto && !logicalWidthIsAuto && logicalRightIsAuto) {
2485 // RULE 6: (no need solve for right)
2486 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2487 logicalWidthValue = computeContentBoxLogicalWidth(logicalWidth.calcValue(containerLogicalWidth));
2488 }
2489 }
2490
2491 // Use computed values to calculate the horizontal position.
2492
2493 // FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
2494 // positioned, inline because right now, it is using the logical left position
2495 // of the first line box when really it should use the last line box. When
2496 // this is fixed elsewhere, this block should be removed.
2497 if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
2498 const RenderInline* flow = toRenderInline(containerBlock);
2499 InlineFlowBox* firstLine = flow->firstLineBox();
2500 InlineFlowBox* lastLine = flow->lastLineBox();
2501 if (firstLine && lastLine && firstLine != lastLine) {
2502 logicalLeftPos = logicalLeftValue + marginLogicalLeftValue + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
2503 return;
2504 }
2505 }
2506
2507 logicalLeftPos = logicalLeftValue + marginLogicalLeftValue;
2508 computeLogicalLeftPositionedOffset(logicalLeftPos, this, logicalWidthValue, containerBlock, containerLogicalWidth);
2509 }
2510
computeBlockStaticDistance(Length & logicalTop,Length & logicalBottom,const RenderBox * child,const RenderBoxModelObject * containerBlock)2511 static void computeBlockStaticDistance(Length& logicalTop, Length& logicalBottom, const RenderBox* child, const RenderBoxModelObject* containerBlock)
2512 {
2513 if (!logicalTop.isAuto() || !logicalBottom.isAuto())
2514 return;
2515
2516 // FIXME: The static distance computation has not been patched for mixed writing modes.
2517 int staticLogicalTop = child->layer()->staticBlockPosition() - containerBlock->borderBefore();
2518 for (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
2519 if (curr->isBox() && !curr->isTableRow())
2520 staticLogicalTop += toRenderBox(curr)->logicalTop();
2521 }
2522 logicalTop.setValue(Fixed, staticLogicalTop);
2523 }
2524
computePositionedLogicalHeight()2525 void RenderBox::computePositionedLogicalHeight()
2526 {
2527 if (isReplaced()) {
2528 computePositionedLogicalHeightReplaced();
2529 return;
2530 }
2531
2532 // The following is based off of the W3C Working Draft from April 11, 2006 of
2533 // CSS 2.1: Section 10.6.4 "Absolutely positioned, non-replaced elements"
2534 // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-non-replaced-height>
2535 // (block-style-comments in this function and in computePositionedLogicalHeightUsing()
2536 // correspond to text from the spec)
2537
2538
2539 // We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
2540 const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
2541
2542 const int containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
2543
2544 bool isHorizontal = isHorizontalWritingMode();
2545 bool isFlipped = style()->isFlippedBlocksWritingMode();
2546 const int bordersPlusPadding = borderAndPaddingLogicalHeight();
2547 const Length marginBefore = style()->marginBefore();
2548 const Length marginAfter = style()->marginAfter();
2549 int& marginBeforeAlias = isHorizontal ? (isFlipped ? m_marginBottom : m_marginTop) : (isFlipped ? m_marginRight: m_marginLeft);
2550 int& marginAfterAlias = isHorizontal ? (isFlipped ? m_marginTop : m_marginBottom) : (isFlipped ? m_marginLeft: m_marginRight);
2551
2552 Length logicalTop = style()->logicalTop();
2553 Length logicalBottom = style()->logicalBottom();
2554
2555 /*---------------------------------------------------------------------------*\
2556 * For the purposes of this section and the next, the term "static position"
2557 * (of an element) refers, roughly, to the position an element would have had
2558 * in the normal flow. More precisely, the static position for 'top' is the
2559 * distance from the top edge of the containing block to the top margin edge
2560 * of a hypothetical box that would have been the first box of the element if
2561 * its 'position' property had been 'static' and 'float' had been 'none'. The
2562 * value is negative if the hypothetical box is above the containing block.
2563 *
2564 * But rather than actually calculating the dimensions of that hypothetical
2565 * box, user agents are free to make a guess at its probable position.
2566 *
2567 * For the purposes of calculating the static position, the containing block
2568 * of fixed positioned elements is the initial containing block instead of
2569 * the viewport.
2570 \*---------------------------------------------------------------------------*/
2571
2572 // see FIXME 2
2573 // Calculate the static distance if needed.
2574 computeBlockStaticDistance(logicalTop, logicalBottom, this, containerBlock);
2575
2576 int logicalHeightResult; // Needed to compute overflow.
2577 int logicalTopPos;
2578
2579 // Calculate constraint equation values for 'height' case.
2580 computePositionedLogicalHeightUsing(style()->logicalHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding,
2581 logicalTop, logicalBottom, marginBefore, marginAfter,
2582 logicalHeightResult, marginBeforeAlias, marginAfterAlias, logicalTopPos);
2583 setLogicalTop(logicalTopPos);
2584
2585 // Avoid doing any work in the common case (where the values of min-height and max-height are their defaults).
2586 // see FIXME 3
2587
2588 // Calculate constraint equation values for 'max-height' case.
2589 if (!style()->logicalMaxHeight().isUndefined()) {
2590 int maxLogicalHeight;
2591 int maxMarginBefore;
2592 int maxMarginAfter;
2593 int maxLogicalTopPos;
2594
2595 computePositionedLogicalHeightUsing(style()->logicalMaxHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding,
2596 logicalTop, logicalBottom, marginBefore, marginAfter,
2597 maxLogicalHeight, maxMarginBefore, maxMarginAfter, maxLogicalTopPos);
2598
2599 if (logicalHeightResult > maxLogicalHeight) {
2600 logicalHeightResult = maxLogicalHeight;
2601 marginBeforeAlias = maxMarginBefore;
2602 marginAfterAlias = maxMarginAfter;
2603 setLogicalTop(maxLogicalTopPos);
2604 }
2605 }
2606
2607 // Calculate constraint equation values for 'min-height' case.
2608 if (!style()->logicalMinHeight().isZero()) {
2609 int minLogicalHeight;
2610 int minMarginBefore;
2611 int minMarginAfter;
2612 int minLogicalTopPos;
2613
2614 computePositionedLogicalHeightUsing(style()->logicalMinHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding,
2615 logicalTop, logicalBottom, marginBefore, marginAfter,
2616 minLogicalHeight, minMarginBefore, minMarginAfter, minLogicalTopPos);
2617
2618 if (logicalHeightResult < minLogicalHeight) {
2619 logicalHeightResult = minLogicalHeight;
2620 marginBeforeAlias = minMarginBefore;
2621 marginAfterAlias = minMarginAfter;
2622 setLogicalTop(minLogicalTopPos);
2623 }
2624 }
2625
2626 // Set final height value.
2627 setLogicalHeight(logicalHeightResult + bordersPlusPadding);
2628 }
2629
computeLogicalTopPositionedOffset(int & logicalTopPos,const RenderBox * child,int logicalHeightValue,const RenderBoxModelObject * containerBlock,int containerLogicalHeight)2630 static void computeLogicalTopPositionedOffset(int& logicalTopPos, const RenderBox* child, int logicalHeightValue, const RenderBoxModelObject* containerBlock, int containerLogicalHeight)
2631 {
2632 // Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
2633 // along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
2634 if ((child->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode())
2635 || (child->style()->isFlippedBlocksWritingMode() != containerBlock->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()))
2636 logicalTopPos = containerLogicalHeight - logicalHeightValue - logicalTopPos;
2637
2638 // Our offset is from the logical bottom edge in a flipped environment, e.g., right for vertical-rl and bottom for horizontal-bt.
2639 if (containerBlock->style()->isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()) {
2640 if (child->isHorizontalWritingMode())
2641 logicalTopPos += containerBlock->borderBottom();
2642 else
2643 logicalTopPos += containerBlock->borderRight();
2644 } else {
2645 if (child->isHorizontalWritingMode())
2646 logicalTopPos += containerBlock->borderTop();
2647 else
2648 logicalTopPos += containerBlock->borderLeft();
2649 }
2650 }
2651
computePositionedLogicalHeightUsing(Length logicalHeightLength,const RenderBoxModelObject * containerBlock,int containerLogicalHeight,int bordersPlusPadding,Length logicalTop,Length logicalBottom,Length marginBefore,Length marginAfter,int & logicalHeightValue,int & marginBeforeValue,int & marginAfterValue,int & logicalTopPos)2652 void RenderBox::computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
2653 int containerLogicalHeight, int bordersPlusPadding,
2654 Length logicalTop, Length logicalBottom, Length marginBefore, Length marginAfter,
2655 int& logicalHeightValue, int& marginBeforeValue, int& marginAfterValue, int& logicalTopPos)
2656 {
2657 // 'top' and 'bottom' cannot both be 'auto' because 'top would of been
2658 // converted to the static position in computePositionedLogicalHeight()
2659 ASSERT(!(logicalTop.isAuto() && logicalBottom.isAuto()));
2660
2661 int contentLogicalHeight = logicalHeight() - bordersPlusPadding;
2662
2663 int logicalTopValue = 0;
2664
2665 bool logicalHeightIsAuto = logicalHeightLength.isAuto();
2666 bool logicalTopIsAuto = logicalTop.isAuto();
2667 bool logicalBottomIsAuto = logicalBottom.isAuto();
2668
2669 // Height is never unsolved for tables.
2670 if (isTable()) {
2671 logicalHeightLength.setValue(Fixed, contentLogicalHeight);
2672 logicalHeightIsAuto = false;
2673 }
2674
2675 if (!logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
2676 /*-----------------------------------------------------------------------*\
2677 * If none of the three are 'auto': If both 'margin-top' and 'margin-
2678 * bottom' are 'auto', solve the equation under the extra constraint that
2679 * the two margins get equal values. If one of 'margin-top' or 'margin-
2680 * bottom' is 'auto', solve the equation for that value. If the values
2681 * are over-constrained, ignore the value for 'bottom' and solve for that
2682 * value.
2683 \*-----------------------------------------------------------------------*/
2684 // NOTE: It is not necessary to solve for 'bottom' in the over constrained
2685 // case because the value is not used for any further calculations.
2686
2687 logicalHeightValue = computeContentBoxLogicalHeight(logicalHeightLength.calcValue(containerLogicalHeight));
2688 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
2689
2690 const int availableSpace = containerLogicalHeight - (logicalTopValue + logicalHeightValue + logicalBottom.calcValue(containerLogicalHeight) + bordersPlusPadding);
2691
2692 // Margins are now the only unknown
2693 if (marginBefore.isAuto() && marginAfter.isAuto()) {
2694 // Both margins auto, solve for equality
2695 // NOTE: This may result in negative values.
2696 marginBeforeValue = availableSpace / 2; // split the difference
2697 marginAfterValue = availableSpace - marginBeforeValue; // account for odd valued differences
2698 } else if (marginBefore.isAuto()) {
2699 // Solve for top margin
2700 marginAfterValue = marginAfter.calcValue(containerLogicalHeight);
2701 marginBeforeValue = availableSpace - marginAfterValue;
2702 } else if (marginAfter.isAuto()) {
2703 // Solve for bottom margin
2704 marginBeforeValue = marginBefore.calcValue(containerLogicalHeight);
2705 marginAfterValue = availableSpace - marginBeforeValue;
2706 } else {
2707 // Over-constrained, (no need solve for bottom)
2708 marginBeforeValue = marginBefore.calcValue(containerLogicalHeight);
2709 marginAfterValue = marginAfter.calcValue(containerLogicalHeight);
2710 }
2711 } else {
2712 /*--------------------------------------------------------------------*\
2713 * Otherwise, set 'auto' values for 'margin-top' and 'margin-bottom'
2714 * to 0, and pick the one of the following six rules that applies.
2715 *
2716 * 1. 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then
2717 * the height is based on the content, and solve for 'top'.
2718 *
2719 * OMIT RULE 2 AS IT SHOULD NEVER BE HIT
2720 * ------------------------------------------------------------------
2721 * 2. 'top' and 'bottom' are 'auto' and 'height' is not 'auto', then
2722 * set 'top' to the static position, and solve for 'bottom'.
2723 * ------------------------------------------------------------------
2724 *
2725 * 3. 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then
2726 * the height is based on the content, and solve for 'bottom'.
2727 * 4. 'top' is 'auto', 'height' and 'bottom' are not 'auto', and
2728 * solve for 'top'.
2729 * 5. 'height' is 'auto', 'top' and 'bottom' are not 'auto', and
2730 * solve for 'height'.
2731 * 6. 'bottom' is 'auto', 'top' and 'height' are not 'auto', and
2732 * solve for 'bottom'.
2733 \*--------------------------------------------------------------------*/
2734 // NOTE: For rules 3 and 6 it is not necessary to solve for 'bottom'
2735 // because the value is not used for any further calculations.
2736
2737 // Calculate margins, 'auto' margins are ignored.
2738 marginBeforeValue = marginBefore.calcMinValue(containerLogicalHeight);
2739 marginAfterValue = marginAfter.calcMinValue(containerLogicalHeight);
2740
2741 const int availableSpace = containerLogicalHeight - (marginBeforeValue + marginAfterValue + bordersPlusPadding);
2742
2743 // Use rule/case that applies.
2744 if (logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
2745 // RULE 1: (height is content based, solve of top)
2746 logicalHeightValue = contentLogicalHeight;
2747 logicalTopValue = availableSpace - (logicalHeightValue + logicalBottom.calcValue(containerLogicalHeight));
2748 } else if (!logicalTopIsAuto && logicalHeightIsAuto && logicalBottomIsAuto) {
2749 // RULE 3: (height is content based, no need solve of bottom)
2750 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
2751 logicalHeightValue = contentLogicalHeight;
2752 } else if (logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
2753 // RULE 4: (solve of top)
2754 logicalHeightValue = computeContentBoxLogicalHeight(logicalHeightLength.calcValue(containerLogicalHeight));
2755 logicalTopValue = availableSpace - (logicalHeightValue + logicalBottom.calcValue(containerLogicalHeight));
2756 } else if (!logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
2757 // RULE 5: (solve of height)
2758 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
2759 logicalHeightValue = max(0, availableSpace - (logicalTopValue + logicalBottom.calcValue(containerLogicalHeight)));
2760 } else if (!logicalTopIsAuto && !logicalHeightIsAuto && logicalBottomIsAuto) {
2761 // RULE 6: (no need solve of bottom)
2762 logicalHeightValue = computeContentBoxLogicalHeight(logicalHeightLength.calcValue(containerLogicalHeight));
2763 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
2764 }
2765 }
2766
2767 // Use computed values to calculate the vertical position.
2768 logicalTopPos = logicalTopValue + marginBeforeValue;
2769 computeLogicalTopPositionedOffset(logicalTopPos, this, logicalHeightValue, containerBlock, containerLogicalHeight);
2770 }
2771
computePositionedLogicalWidthReplaced()2772 void RenderBox::computePositionedLogicalWidthReplaced()
2773 {
2774 // The following is based off of the W3C Working Draft from April 11, 2006 of
2775 // CSS 2.1: Section 10.3.8 "Absolutely positioned, replaced elements"
2776 // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
2777 // (block-style-comments in this function correspond to text from the spec and
2778 // the numbers correspond to numbers in spec)
2779
2780 // We don't use containingBlock(), since we may be positioned by an enclosing
2781 // relative positioned inline.
2782 const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
2783
2784 const int containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
2785
2786 // To match WinIE, in quirks mode use the parent's 'direction' property
2787 // instead of the the container block's.
2788 TextDirection containerDirection = (document()->inQuirksMode()) ? parent()->style()->direction() : containerBlock->style()->direction();
2789
2790 // Variables to solve.
2791 bool isHorizontal = isHorizontalWritingMode();
2792 Length logicalLeft = style()->logicalLeft();
2793 Length logicalRight = style()->logicalRight();
2794 Length marginLogicalLeft = isHorizontal ? style()->marginLeft() : style()->marginTop();
2795 Length marginLogicalRight = isHorizontal ? style()->marginRight() : style()->marginBottom();
2796 int& marginLogicalLeftAlias = isHorizontal ? m_marginLeft : m_marginTop;
2797 int& marginLogicalRightAlias = isHorizontal ? m_marginRight : m_marginBottom;
2798
2799 /*-----------------------------------------------------------------------*\
2800 * 1. The used value of 'width' is determined as for inline replaced
2801 * elements.
2802 \*-----------------------------------------------------------------------*/
2803 // NOTE: This value of width is FINAL in that the min/max width calculations
2804 // are dealt with in computeReplacedWidth(). This means that the steps to produce
2805 // correct max/min in the non-replaced version, are not necessary.
2806 setLogicalWidth(computeReplacedLogicalWidth() + borderAndPaddingLogicalWidth());
2807 const int availableSpace = containerLogicalWidth - logicalWidth();
2808
2809 /*-----------------------------------------------------------------------*\
2810 * 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
2811 * of the containing block is 'ltr', set 'left' to the static position;
2812 * else if 'direction' is 'rtl', set 'right' to the static position.
2813 \*-----------------------------------------------------------------------*/
2814 // see FIXME 2
2815 computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth, containerDirection);
2816
2817 /*-----------------------------------------------------------------------*\
2818 * 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
2819 * or 'margin-right' with '0'.
2820 \*-----------------------------------------------------------------------*/
2821 if (logicalLeft.isAuto() || logicalRight.isAuto()) {
2822 if (marginLogicalLeft.isAuto())
2823 marginLogicalLeft.setValue(Fixed, 0);
2824 if (marginLogicalRight.isAuto())
2825 marginLogicalRight.setValue(Fixed, 0);
2826 }
2827
2828 /*-----------------------------------------------------------------------*\
2829 * 4. If at this point both 'margin-left' and 'margin-right' are still
2830 * 'auto', solve the equation under the extra constraint that the two
2831 * margins must get equal values, unless this would make them negative,
2832 * in which case when the direction of the containing block is 'ltr'
2833 * ('rtl'), set 'margin-left' ('margin-right') to zero and solve for
2834 * 'margin-right' ('margin-left').
2835 \*-----------------------------------------------------------------------*/
2836 int logicalLeftValue = 0;
2837 int logicalRightValue = 0;
2838
2839 if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
2840 // 'left' and 'right' cannot be 'auto' due to step 3
2841 ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
2842
2843 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2844 logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2845
2846 int difference = availableSpace - (logicalLeftValue + logicalRightValue);
2847 if (difference > 0) {
2848 marginLogicalLeftAlias = difference / 2; // split the difference
2849 marginLogicalRightAlias = difference - marginLogicalLeftAlias; // account for odd valued differences
2850 } else {
2851 // see FIXME 1
2852 if (containerDirection == LTR) {
2853 marginLogicalLeftAlias = 0;
2854 marginLogicalRightAlias = difference; // will be negative
2855 } else {
2856 marginLogicalLeftAlias = difference; // will be negative
2857 marginLogicalRightAlias = 0;
2858 }
2859 }
2860
2861 /*-----------------------------------------------------------------------*\
2862 * 5. If at this point there is an 'auto' left, solve the equation for
2863 * that value.
2864 \*-----------------------------------------------------------------------*/
2865 } else if (logicalLeft.isAuto()) {
2866 marginLogicalLeftAlias = marginLogicalLeft.calcValue(containerLogicalWidth);
2867 marginLogicalRightAlias = marginLogicalRight.calcValue(containerLogicalWidth);
2868 logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2869
2870 // Solve for 'left'
2871 logicalLeftValue = availableSpace - (logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias);
2872 } else if (logicalRight.isAuto()) {
2873 marginLogicalLeftAlias = marginLogicalLeft.calcValue(containerLogicalWidth);
2874 marginLogicalRightAlias = marginLogicalRight.calcValue(containerLogicalWidth);
2875 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2876
2877 // Solve for 'right'
2878 logicalRightValue = availableSpace - (logicalLeftValue + marginLogicalLeftAlias + marginLogicalRightAlias);
2879 } else if (marginLogicalLeft.isAuto()) {
2880 marginLogicalRightAlias = marginLogicalRight.calcValue(containerLogicalWidth);
2881 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2882 logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2883
2884 // Solve for 'margin-left'
2885 marginLogicalLeftAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalRightAlias);
2886 } else if (marginLogicalRight.isAuto()) {
2887 marginLogicalLeftAlias = marginLogicalLeft.calcValue(containerLogicalWidth);
2888 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2889 logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2890
2891 // Solve for 'margin-right'
2892 marginLogicalRightAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalLeftAlias);
2893 } else {
2894 // Nothing is 'auto', just calculate the values.
2895 marginLogicalLeftAlias = marginLogicalLeft.calcValue(containerLogicalWidth);
2896 marginLogicalRightAlias = marginLogicalRight.calcValue(containerLogicalWidth);
2897 logicalRightValue = logicalRight.calcValue(containerLogicalWidth);
2898 logicalLeftValue = logicalLeft.calcValue(containerLogicalWidth);
2899 }
2900
2901 /*-----------------------------------------------------------------------*\
2902 * 6. If at this point the values are over-constrained, ignore the value
2903 * for either 'left' (in case the 'direction' property of the
2904 * containing block is 'rtl') or 'right' (in case 'direction' is
2905 * 'ltr') and solve for that value.
2906 \*-----------------------------------------------------------------------*/
2907 // NOTE: It is not necessary to solve for 'right' when the direction is
2908 // LTR because the value is not used.
2909 int totalLogicalWidth = logicalWidth() + logicalLeftValue + logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias;
2910 if (totalLogicalWidth > containerLogicalWidth && (containerDirection == RTL))
2911 logicalLeftValue = containerLogicalWidth - (totalLogicalWidth - logicalLeftValue);
2912
2913 // FIXME: Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space, so that
2914 // can make the result here rather complicated to compute.
2915
2916 // Use computed values to calculate the horizontal position.
2917
2918 // FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
2919 // positioned, inline containing block because right now, it is using the logical left position
2920 // of the first line box when really it should use the last line box. When
2921 // this is fixed elsewhere, this block should be removed.
2922 if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
2923 const RenderInline* flow = toRenderInline(containerBlock);
2924 InlineFlowBox* firstLine = flow->firstLineBox();
2925 InlineFlowBox* lastLine = flow->lastLineBox();
2926 if (firstLine && lastLine && firstLine != lastLine) {
2927 setLogicalLeft(logicalLeftValue + marginLogicalLeftAlias + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft()));
2928 return;
2929 }
2930 }
2931
2932 int logicalLeftPos = logicalLeftValue + marginLogicalLeftAlias;
2933 computeLogicalLeftPositionedOffset(logicalLeftPos, this, logicalWidth(), containerBlock, containerLogicalWidth);
2934 setLogicalLeft(logicalLeftPos);
2935 }
2936
computePositionedLogicalHeightReplaced()2937 void RenderBox::computePositionedLogicalHeightReplaced()
2938 {
2939 // The following is based off of the W3C Working Draft from April 11, 2006 of
2940 // CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
2941 // <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
2942 // (block-style-comments in this function correspond to text from the spec and
2943 // the numbers correspond to numbers in spec)
2944
2945 // We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
2946 const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
2947
2948 const int containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
2949
2950 // Variables to solve.
2951 bool isHorizontal = isHorizontalWritingMode();
2952 bool isFlipped = style()->isFlippedBlocksWritingMode();
2953 Length marginBefore = style()->marginBefore();
2954 Length marginAfter = style()->marginAfter();
2955 int& marginBeforeAlias = isHorizontal ? (isFlipped ? m_marginBottom : m_marginTop) : (isFlipped ? m_marginRight: m_marginLeft);
2956 int& marginAfterAlias = isHorizontal ? (isFlipped ? m_marginTop : m_marginBottom) : (isFlipped ? m_marginLeft: m_marginRight);
2957
2958 Length logicalTop = style()->logicalTop();
2959 Length logicalBottom = style()->logicalBottom();
2960
2961 /*-----------------------------------------------------------------------*\
2962 * 1. The used value of 'height' is determined as for inline replaced
2963 * elements.
2964 \*-----------------------------------------------------------------------*/
2965 // NOTE: This value of height is FINAL in that the min/max height calculations
2966 // are dealt with in computeReplacedHeight(). This means that the steps to produce
2967 // correct max/min in the non-replaced version, are not necessary.
2968 setLogicalHeight(computeReplacedLogicalHeight() + borderAndPaddingLogicalHeight());
2969 const int availableSpace = containerLogicalHeight - logicalHeight();
2970
2971 /*-----------------------------------------------------------------------*\
2972 * 2. If both 'top' and 'bottom' have the value 'auto', replace 'top'
2973 * with the element's static position.
2974 \*-----------------------------------------------------------------------*/
2975 // see FIXME 2
2976 computeBlockStaticDistance(logicalTop, logicalBottom, this, containerBlock);
2977
2978 /*-----------------------------------------------------------------------*\
2979 * 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
2980 * 'margin-bottom' with '0'.
2981 \*-----------------------------------------------------------------------*/
2982 // FIXME: The spec. says that this step should only be taken when bottom is
2983 // auto, but if only top is auto, this makes step 4 impossible.
2984 if (logicalTop.isAuto() || logicalBottom.isAuto()) {
2985 if (marginBefore.isAuto())
2986 marginBefore.setValue(Fixed, 0);
2987 if (marginAfter.isAuto())
2988 marginAfter.setValue(Fixed, 0);
2989 }
2990
2991 /*-----------------------------------------------------------------------*\
2992 * 4. If at this point both 'margin-top' and 'margin-bottom' are still
2993 * 'auto', solve the equation under the extra constraint that the two
2994 * margins must get equal values.
2995 \*-----------------------------------------------------------------------*/
2996 int logicalTopValue = 0;
2997 int logicalBottomValue = 0;
2998
2999 if (marginBefore.isAuto() && marginAfter.isAuto()) {
3000 // 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combined.
3001 ASSERT(!(logicalTop.isAuto() || logicalBottom.isAuto()));
3002
3003 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
3004 logicalBottomValue = logicalBottom.calcValue(containerLogicalHeight);
3005
3006 int difference = availableSpace - (logicalTopValue + logicalBottomValue);
3007 // NOTE: This may result in negative values.
3008 marginBeforeAlias = difference / 2; // split the difference
3009 marginAfterAlias = difference - marginBeforeAlias; // account for odd valued differences
3010
3011 /*-----------------------------------------------------------------------*\
3012 * 5. If at this point there is only one 'auto' left, solve the equation
3013 * for that value.
3014 \*-----------------------------------------------------------------------*/
3015 } else if (logicalTop.isAuto()) {
3016 marginBeforeAlias = marginBefore.calcValue(containerLogicalHeight);
3017 marginAfterAlias = marginAfter.calcValue(containerLogicalHeight);
3018 logicalBottomValue = logicalBottom.calcValue(containerLogicalHeight);
3019
3020 // Solve for 'top'
3021 logicalTopValue = availableSpace - (logicalBottomValue + marginBeforeAlias + marginAfterAlias);
3022 } else if (logicalBottom.isAuto()) {
3023 marginBeforeAlias = marginBefore.calcValue(containerLogicalHeight);
3024 marginAfterAlias = marginAfter.calcValue(containerLogicalHeight);
3025 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
3026
3027 // Solve for 'bottom'
3028 // NOTE: It is not necessary to solve for 'bottom' because we don't ever
3029 // use the value.
3030 } else if (marginBefore.isAuto()) {
3031 marginAfterAlias = marginAfter.calcValue(containerLogicalHeight);
3032 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
3033 logicalBottomValue = logicalBottom.calcValue(containerLogicalHeight);
3034
3035 // Solve for 'margin-top'
3036 marginBeforeAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginAfterAlias);
3037 } else if (marginAfter.isAuto()) {
3038 marginBeforeAlias = marginBefore.calcValue(containerLogicalHeight);
3039 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
3040 logicalBottomValue = logicalBottom.calcValue(containerLogicalHeight);
3041
3042 // Solve for 'margin-bottom'
3043 marginAfterAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginBeforeAlias);
3044 } else {
3045 // Nothing is 'auto', just calculate the values.
3046 marginBeforeAlias = marginBefore.calcValue(containerLogicalHeight);
3047 marginAfterAlias = marginAfter.calcValue(containerLogicalHeight);
3048 logicalTopValue = logicalTop.calcValue(containerLogicalHeight);
3049 // NOTE: It is not necessary to solve for 'bottom' because we don't ever
3050 // use the value.
3051 }
3052
3053 /*-----------------------------------------------------------------------*\
3054 * 6. If at this point the values are over-constrained, ignore the value
3055 * for 'bottom' and solve for that value.
3056 \*-----------------------------------------------------------------------*/
3057 // NOTE: It is not necessary to do this step because we don't end up using
3058 // the value of 'bottom' regardless of whether the values are over-constrained
3059 // or not.
3060
3061 // Use computed values to calculate the vertical position.
3062 int logicalTopPos = logicalTopValue + marginBeforeAlias;
3063 computeLogicalTopPositionedOffset(logicalTopPos, this, logicalHeight(), containerBlock, containerLogicalHeight);
3064 setLogicalTop(logicalTopPos);
3065 }
3066
localCaretRect(InlineBox * box,int caretOffset,int * extraWidthToEndOfLine)3067 IntRect RenderBox::localCaretRect(InlineBox* box, int caretOffset, int* extraWidthToEndOfLine)
3068 {
3069 // VisiblePositions at offsets inside containers either a) refer to the positions before/after
3070 // those containers (tables and select elements) or b) refer to the position inside an empty block.
3071 // They never refer to children.
3072 // FIXME: Paint the carets inside empty blocks differently than the carets before/after elements.
3073
3074 // FIXME: What about border and padding?
3075 IntRect rect(x(), y(), caretWidth, height());
3076 bool ltr = box ? box->isLeftToRightDirection() : style()->isLeftToRightDirection();
3077
3078 if ((!caretOffset) ^ ltr)
3079 rect.move(IntSize(width() - caretWidth, 0));
3080
3081 if (box) {
3082 RootInlineBox* rootBox = box->root();
3083 int top = rootBox->lineTop();
3084 rect.setY(top);
3085 rect.setHeight(rootBox->lineBottom() - top);
3086 }
3087
3088 // If height of box is smaller than font height, use the latter one,
3089 // otherwise the caret might become invisible.
3090 //
3091 // Also, if the box is not a replaced element, always use the font height.
3092 // This prevents the "big caret" bug described in:
3093 // <rdar://problem/3777804> Deleting all content in a document can result in giant tall-as-window insertion point
3094 //
3095 // FIXME: ignoring :first-line, missing good reason to take care of
3096 int fontHeight = style()->fontMetrics().height();
3097 if (fontHeight > rect.height() || (!isReplaced() && !isTable()))
3098 rect.setHeight(fontHeight);
3099
3100 if (extraWidthToEndOfLine)
3101 *extraWidthToEndOfLine = x() + width() - rect.maxX();
3102
3103 // Move to local coords
3104 rect.move(-x(), -y());
3105 return rect;
3106 }
3107
positionForPoint(const IntPoint & point)3108 VisiblePosition RenderBox::positionForPoint(const IntPoint& point)
3109 {
3110 // no children...return this render object's element, if there is one, and offset 0
3111 if (!firstChild())
3112 return createVisiblePosition(node() ? firstPositionInOrBeforeNode(node()) : Position(0, 0));
3113
3114 int xPos = point.x();
3115 int yPos = point.y();
3116
3117 if (isTable() && node()) {
3118 int right = contentWidth() + borderAndPaddingWidth();
3119 int bottom = contentHeight() + borderAndPaddingHeight();
3120
3121 if (xPos < 0 || xPos > right || yPos < 0 || yPos > bottom) {
3122 if (xPos <= right / 2)
3123 return createVisiblePosition(firstPositionInOrBeforeNode(node()));
3124 return createVisiblePosition(lastPositionInOrAfterNode(node()));
3125 }
3126 }
3127
3128 // Pass off to the closest child.
3129 int minDist = INT_MAX;
3130 RenderBox* closestRenderer = 0;
3131 int newX = xPos;
3132 int newY = yPos;
3133 if (isTableRow()) {
3134 newX += x();
3135 newY += y();
3136 }
3137 for (RenderObject* renderObject = firstChild(); renderObject; renderObject = renderObject->nextSibling()) {
3138 if ((!renderObject->firstChild() && !renderObject->isInline() && !renderObject->isBlockFlow() )
3139 || renderObject->style()->visibility() != VISIBLE)
3140 continue;
3141
3142 if (!renderObject->isBox())
3143 continue;
3144
3145 RenderBox* renderer = toRenderBox(renderObject);
3146
3147 int top = renderer->borderTop() + renderer->paddingTop() + (isTableRow() ? 0 : renderer->y());
3148 int bottom = top + renderer->contentHeight();
3149 int left = renderer->borderLeft() + renderer->paddingLeft() + (isTableRow() ? 0 : renderer->x());
3150 int right = left + renderer->contentWidth();
3151
3152 if (xPos <= right && xPos >= left && yPos <= top && yPos >= bottom) {
3153 if (renderer->isTableRow())
3154 return renderer->positionForCoordinates(xPos + newX - renderer->x(), yPos + newY - renderer->y());
3155 return renderer->positionForCoordinates(xPos - renderer->x(), yPos - renderer->y());
3156 }
3157
3158 // Find the distance from (x, y) to the box. Split the space around the box into 8 pieces
3159 // and use a different compare depending on which piece (x, y) is in.
3160 IntPoint cmp;
3161 if (xPos > right) {
3162 if (yPos < top)
3163 cmp = IntPoint(right, top);
3164 else if (yPos > bottom)
3165 cmp = IntPoint(right, bottom);
3166 else
3167 cmp = IntPoint(right, yPos);
3168 } else if (xPos < left) {
3169 if (yPos < top)
3170 cmp = IntPoint(left, top);
3171 else if (yPos > bottom)
3172 cmp = IntPoint(left, bottom);
3173 else
3174 cmp = IntPoint(left, yPos);
3175 } else {
3176 if (yPos < top)
3177 cmp = IntPoint(xPos, top);
3178 else
3179 cmp = IntPoint(xPos, bottom);
3180 }
3181
3182 int x1minusx2 = cmp.x() - xPos;
3183 int y1minusy2 = cmp.y() - yPos;
3184
3185 int dist = x1minusx2 * x1minusx2 + y1minusy2 * y1minusy2;
3186 if (dist < minDist) {
3187 closestRenderer = renderer;
3188 minDist = dist;
3189 }
3190 }
3191
3192 if (closestRenderer)
3193 return closestRenderer->positionForCoordinates(newX - closestRenderer->x(), newY - closestRenderer->y());
3194
3195 return createVisiblePosition(firstPositionInOrBeforeNode(node()));
3196 }
3197
shrinkToAvoidFloats() const3198 bool RenderBox::shrinkToAvoidFloats() const
3199 {
3200 // Floating objects don't shrink. Objects that don't avoid floats don't shrink. Marquees don't shrink.
3201 if ((isInline() && !isHTMLMarquee()) || !avoidsFloats() || isFloating())
3202 return false;
3203
3204 // All auto-width objects that avoid floats should always use lineWidth.
3205 return style()->width().isAuto();
3206 }
3207
avoidsFloats() const3208 bool RenderBox::avoidsFloats() const
3209 {
3210 return isReplaced() || hasOverflowClip() || isHR() || isLegend() || isWritingModeRoot() || isDeprecatedFlexItem();
3211 }
3212
addShadowOverflow()3213 void RenderBox::addShadowOverflow()
3214 {
3215 int shadowLeft;
3216 int shadowRight;
3217 int shadowTop;
3218 int shadowBottom;
3219 style()->getBoxShadowExtent(shadowTop, shadowRight, shadowBottom, shadowLeft);
3220 IntRect borderBox = borderBoxRect();
3221 int overflowLeft = borderBox.x() + shadowLeft;
3222 int overflowRight = borderBox.maxX() + shadowRight;
3223 int overflowTop = borderBox.y() + shadowTop;
3224 int overflowBottom = borderBox.maxY() + shadowBottom;
3225 addVisualOverflow(IntRect(overflowLeft, overflowTop, overflowRight - overflowLeft, overflowBottom - overflowTop));
3226 }
3227
addOverflowFromChild(RenderBox * child,const IntSize & delta)3228 void RenderBox::addOverflowFromChild(RenderBox* child, const IntSize& delta)
3229 {
3230 // Only propagate layout overflow from the child if the child isn't clipping its overflow. If it is, then
3231 // its overflow is internal to it, and we don't care about it. layoutOverflowRectForPropagation takes care of this
3232 // and just propagates the border box rect instead.
3233 IntRect childLayoutOverflowRect = child->layoutOverflowRectForPropagation(style());
3234 childLayoutOverflowRect.move(delta);
3235 addLayoutOverflow(childLayoutOverflowRect);
3236
3237 // Add in visual overflow from the child. Even if the child clips its overflow, it may still
3238 // have visual overflow of its own set from box shadows or reflections. It is unnecessary to propagate this
3239 // overflow if we are clipping our own overflow.
3240 if (child->hasSelfPaintingLayer() || hasOverflowClip())
3241 return;
3242 IntRect childVisualOverflowRect = child->visualOverflowRectForPropagation(style());
3243 childVisualOverflowRect.move(delta);
3244 addVisualOverflow(childVisualOverflowRect);
3245 }
3246
addLayoutOverflow(const IntRect & rect)3247 void RenderBox::addLayoutOverflow(const IntRect& rect)
3248 {
3249 IntRect clientBox = clientBoxRect();
3250 if (clientBox.contains(rect) || rect.isEmpty())
3251 return;
3252
3253 // For overflow clip objects, we don't want to propagate overflow into unreachable areas.
3254 IntRect overflowRect(rect);
3255 if (hasOverflowClip() || isRenderView()) {
3256 // Overflow is in the block's coordinate space and thus is flipped for horizontal-bt and vertical-rl
3257 // writing modes. At this stage that is actually a simplification, since we can treat horizontal-tb/bt as the same
3258 // and vertical-lr/rl as the same.
3259 bool hasTopOverflow = !style()->isLeftToRightDirection() && !isHorizontalWritingMode();
3260 bool hasLeftOverflow = !style()->isLeftToRightDirection() && isHorizontalWritingMode();
3261
3262 if (!hasTopOverflow)
3263 overflowRect.shiftYEdgeTo(max(overflowRect.y(), clientBox.y()));
3264 else
3265 overflowRect.shiftMaxYEdgeTo(min(overflowRect.maxY(), clientBox.maxY()));
3266 if (!hasLeftOverflow)
3267 overflowRect.shiftXEdgeTo(max(overflowRect.x(), clientBox.x()));
3268 else
3269 overflowRect.shiftMaxXEdgeTo(min(overflowRect.maxX(), clientBox.maxX()));
3270
3271 // Now re-test with the adjusted rectangle and see if it has become unreachable or fully
3272 // contained.
3273 if (clientBox.contains(overflowRect) || overflowRect.isEmpty())
3274 return;
3275 }
3276
3277 if (!m_overflow)
3278 m_overflow = adoptPtr(new RenderOverflow(clientBox, borderBoxRect()));
3279
3280 m_overflow->addLayoutOverflow(overflowRect);
3281 }
3282
addVisualOverflow(const IntRect & rect)3283 void RenderBox::addVisualOverflow(const IntRect& rect)
3284 {
3285 IntRect borderBox = borderBoxRect();
3286 if (borderBox.contains(rect) || rect.isEmpty())
3287 return;
3288
3289 if (!m_overflow)
3290 m_overflow = adoptPtr(new RenderOverflow(clientBoxRect(), borderBox));
3291
3292 m_overflow->addVisualOverflow(rect);
3293 }
3294
clearLayoutOverflow()3295 void RenderBox::clearLayoutOverflow()
3296 {
3297 if (!m_overflow)
3298 return;
3299
3300 if (visualOverflowRect() == borderBoxRect()) {
3301 m_overflow.clear();
3302 return;
3303 }
3304
3305 m_overflow->resetLayoutOverflow(borderBoxRect());
3306 }
3307
lineHeight(bool,LineDirectionMode direction,LinePositionMode) const3308 int RenderBox::lineHeight(bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
3309 {
3310 if (isReplaced())
3311 return direction == HorizontalLine ? m_marginTop + height() + m_marginBottom : m_marginRight + width() + m_marginLeft;
3312 return 0;
3313 }
3314
baselinePosition(FontBaseline baselineType,bool,LineDirectionMode direction,LinePositionMode) const3315 int RenderBox::baselinePosition(FontBaseline baselineType, bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
3316 {
3317 if (isReplaced()) {
3318 int result = direction == HorizontalLine ? m_marginTop + height() + m_marginBottom : m_marginRight + width() + m_marginLeft;
3319 if (baselineType == AlphabeticBaseline)
3320 return result;
3321 return result - result / 2;
3322 }
3323 return 0;
3324 }
3325
3326
enclosingFloatPaintingLayer() const3327 RenderLayer* RenderBox::enclosingFloatPaintingLayer() const
3328 {
3329 const RenderObject* curr = this;
3330 while (curr) {
3331 RenderLayer* layer = curr->hasLayer() && curr->isBox() ? toRenderBoxModelObject(curr)->layer() : 0;
3332 if (layer && layer->isSelfPaintingLayer())
3333 return layer;
3334 curr = curr->parent();
3335 }
3336 return 0;
3337 }
3338
logicalVisualOverflowRectForPropagation(RenderStyle * parentStyle) const3339 IntRect RenderBox::logicalVisualOverflowRectForPropagation(RenderStyle* parentStyle) const
3340 {
3341 IntRect rect = visualOverflowRectForPropagation(parentStyle);
3342 if (!parentStyle->isHorizontalWritingMode())
3343 return rect.transposedRect();
3344 return rect;
3345 }
3346
visualOverflowRectForPropagation(RenderStyle * parentStyle) const3347 IntRect RenderBox::visualOverflowRectForPropagation(RenderStyle* parentStyle) const
3348 {
3349 // If the writing modes of the child and parent match, then we don't have to
3350 // do anything fancy. Just return the result.
3351 IntRect rect = visualOverflowRect();
3352 if (parentStyle->writingMode() == style()->writingMode())
3353 return rect;
3354
3355 // We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
3356 // in a particular axis, then we have to flip the rect along that axis.
3357 if (style()->writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
3358 rect.setX(width() - rect.maxX());
3359 else if (style()->writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
3360 rect.setY(height() - rect.maxY());
3361
3362 return rect;
3363 }
3364
logicalLayoutOverflowRectForPropagation(RenderStyle * parentStyle) const3365 IntRect RenderBox::logicalLayoutOverflowRectForPropagation(RenderStyle* parentStyle) const
3366 {
3367 IntRect rect = layoutOverflowRectForPropagation(parentStyle);
3368 if (!parentStyle->isHorizontalWritingMode())
3369 return rect.transposedRect();
3370 return rect;
3371 }
3372
layoutOverflowRectForPropagation(RenderStyle * parentStyle) const3373 IntRect RenderBox::layoutOverflowRectForPropagation(RenderStyle* parentStyle) const
3374 {
3375 // Only propagate interior layout overflow if we don't clip it.
3376 IntRect rect = borderBoxRect();
3377 if (!hasOverflowClip())
3378 rect.unite(layoutOverflowRect());
3379
3380 bool hasTransform = hasLayer() && layer()->transform();
3381 if (isRelPositioned() || hasTransform) {
3382 // If we are relatively positioned or if we have a transform, then we have to convert
3383 // this rectangle into physical coordinates, apply relative positioning and transforms
3384 // to it, and then convert it back.
3385 flipForWritingMode(rect);
3386
3387 if (hasTransform)
3388 rect = layer()->currentTransform().mapRect(rect);
3389
3390 if (isRelPositioned())
3391 rect.move(relativePositionOffsetX(), relativePositionOffsetY());
3392
3393 // Now we need to flip back.
3394 flipForWritingMode(rect);
3395 }
3396
3397 // If the writing modes of the child and parent match, then we don't have to
3398 // do anything fancy. Just return the result.
3399 if (parentStyle->writingMode() == style()->writingMode())
3400 return rect;
3401
3402 // We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
3403 // in a particular axis, then we have to flip the rect along that axis.
3404 if (style()->writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
3405 rect.setX(width() - rect.maxX());
3406 else if (style()->writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
3407 rect.setY(height() - rect.maxY());
3408
3409 return rect;
3410 }
3411
flipForWritingMode(const RenderBox * child,const IntPoint & point,FlippingAdjustment adjustment) const3412 IntPoint RenderBox::flipForWritingMode(const RenderBox* child, const IntPoint& point, FlippingAdjustment adjustment) const
3413 {
3414 if (!style()->isFlippedBlocksWritingMode())
3415 return point;
3416
3417 // The child is going to add in its x() and y(), so we have to make sure it ends up in
3418 // the right place.
3419 if (isHorizontalWritingMode())
3420 return IntPoint(point.x(), point.y() + height() - child->height() - child->y() - (adjustment == ParentToChildFlippingAdjustment ? child->y() : 0));
3421 return IntPoint(point.x() + width() - child->width() - child->x() - (adjustment == ParentToChildFlippingAdjustment ? child->x() : 0), point.y());
3422 }
3423
flipForWritingMode(IntRect & rect) const3424 void RenderBox::flipForWritingMode(IntRect& rect) const
3425 {
3426 if (!style()->isFlippedBlocksWritingMode())
3427 return;
3428
3429 if (isHorizontalWritingMode())
3430 rect.setY(height() - rect.maxY());
3431 else
3432 rect.setX(width() - rect.maxX());
3433 }
3434
flipForWritingMode(int position) const3435 int RenderBox::flipForWritingMode(int position) const
3436 {
3437 if (!style()->isFlippedBlocksWritingMode())
3438 return position;
3439 return logicalHeight() - position;
3440 }
3441
flipForWritingMode(const IntPoint & position) const3442 IntPoint RenderBox::flipForWritingMode(const IntPoint& position) const
3443 {
3444 if (!style()->isFlippedBlocksWritingMode())
3445 return position;
3446 return isHorizontalWritingMode() ? IntPoint(position.x(), height() - position.y()) : IntPoint(width() - position.x(), position.y());
3447 }
3448
flipForWritingModeIncludingColumns(const IntPoint & point) const3449 IntPoint RenderBox::flipForWritingModeIncludingColumns(const IntPoint& point) const
3450 {
3451 if (!hasColumns() || !style()->isFlippedBlocksWritingMode())
3452 return flipForWritingMode(point);
3453 return toRenderBlock(this)->flipForWritingModeIncludingColumns(point);
3454 }
3455
flipForWritingMode(const IntSize & offset) const3456 IntSize RenderBox::flipForWritingMode(const IntSize& offset) const
3457 {
3458 if (!style()->isFlippedBlocksWritingMode())
3459 return offset;
3460 return isHorizontalWritingMode() ? IntSize(offset.width(), height() - offset.height()) : IntSize(width() - offset.width(), offset.height());
3461 }
3462
flipForWritingMode(const FloatPoint & position) const3463 FloatPoint RenderBox::flipForWritingMode(const FloatPoint& position) const
3464 {
3465 if (!style()->isFlippedBlocksWritingMode())
3466 return position;
3467 return isHorizontalWritingMode() ? FloatPoint(position.x(), height() - position.y()) : FloatPoint(width() - position.x(), position.y());
3468 }
3469
flipForWritingMode(FloatRect & rect) const3470 void RenderBox::flipForWritingMode(FloatRect& rect) const
3471 {
3472 if (!style()->isFlippedBlocksWritingMode())
3473 return;
3474
3475 if (isHorizontalWritingMode())
3476 rect.setY(height() - rect.maxY());
3477 else
3478 rect.setX(width() - rect.maxX());
3479 }
3480
locationOffsetIncludingFlipping() const3481 IntSize RenderBox::locationOffsetIncludingFlipping() const
3482 {
3483 RenderBlock* containerBlock = containingBlock();
3484 if (!containerBlock || containerBlock == this)
3485 return locationOffset();
3486
3487 IntRect rect(frameRect());
3488 containerBlock->flipForWritingMode(rect); // FIXME: This is wrong if we are an absolutely positioned object enclosed by a relative-positioned inline.
3489 return IntSize(rect.x(), rect.y());
3490 }
3491
3492 } // namespace WebCore
3493