1 /*
2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
4  * Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public License
17  * along with this library; see the file COPYING.LIB.  If not, write to
18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19  * Boston, MA 02110-1301, USA.
20  *
21  */
22 
23 #ifndef RenderBox_h
24 #define RenderBox_h
25 
26 #include "RenderBoxModelObject.h"
27 #include "RenderOverflow.h"
28 #include "ScrollTypes.h"
29 
30 namespace WebCore {
31 
32 struct PaintInfo;
33 
34 enum LogicalWidthType { LogicalWidth, MinLogicalWidth, MaxLogicalWidth };
35 
36 enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
37 
38 class RenderBox : public RenderBoxModelObject {
39 public:
40     RenderBox(Node*);
41     virtual ~RenderBox();
42 
43     // Use this with caution! No type checking is done!
44     RenderBox* firstChildBox() const;
45     RenderBox* lastChildBox() const;
46 
x()47     int x() const { return m_frameRect.x(); }
y()48     int y() const { return m_frameRect.y(); }
width()49     int width() const { return m_frameRect.width(); }
height()50     int height() const { return m_frameRect.height(); }
51 
setX(int x)52     void setX(int x) { m_frameRect.setX(x); }
setY(int y)53     void setY(int y) { m_frameRect.setY(y); }
setWidth(int width)54     void setWidth(int width) { m_frameRect.setWidth(width); }
setHeight(int height)55     void setHeight(int height) { m_frameRect.setHeight(height); }
56 
logicalLeft()57     int logicalLeft() const { return style()->isHorizontalWritingMode() ? x() : y(); }
logicalRight()58     int logicalRight() const { return logicalLeft() + logicalWidth(); }
logicalTop()59     int logicalTop() const { return style()->isHorizontalWritingMode() ? y() : x(); }
logicalBottom()60     int logicalBottom() const { return logicalTop() + logicalHeight(); }
logicalWidth()61     int logicalWidth() const { return style()->isHorizontalWritingMode() ? width() : height(); }
logicalHeight()62     int logicalHeight() const { return style()->isHorizontalWritingMode() ? height() : width(); }
63 
setLogicalLeft(int left)64     void setLogicalLeft(int left)
65     {
66         if (style()->isHorizontalWritingMode())
67             setX(left);
68         else
69             setY(left);
70     }
setLogicalTop(int top)71     void setLogicalTop(int top)
72     {
73         if (style()->isHorizontalWritingMode())
74             setY(top);
75         else
76             setX(top);
77     }
setLogicalWidth(int size)78     void setLogicalWidth(int size)
79     {
80         if (style()->isHorizontalWritingMode())
81             setWidth(size);
82         else
83             setHeight(size);
84     }
setLogicalHeight(int size)85     void setLogicalHeight(int size)
86     {
87         if (style()->isHorizontalWritingMode())
88             setHeight(size);
89         else
90             setWidth(size);
91     }
setLogicalLocation(int left,int top)92     void setLogicalLocation(int left, int top)
93     {
94         if (style()->isHorizontalWritingMode())
95             setLocation(left, top);
96         else
97             setLocation(top, left);
98     }
99 
location()100     IntPoint location() const { return m_frameRect.location(); }
locationOffset()101     IntSize locationOffset() const { return IntSize(x(), y()); }
size()102     IntSize size() const { return m_frameRect.size(); }
103 
setLocation(const IntPoint & location)104     void setLocation(const IntPoint& location) { m_frameRect.setLocation(location); }
setLocation(int x,int y)105     void setLocation(int x, int y) { setLocation(IntPoint(x, y)); }
106 
setSize(const IntSize & size)107     void setSize(const IntSize& size) { m_frameRect.setSize(size); }
move(int dx,int dy)108     void move(int dx, int dy) { m_frameRect.move(dx, dy); }
109 
frameRect()110     IntRect frameRect() const { return m_frameRect; }
setFrameRect(const IntRect & rect)111     void setFrameRect(const IntRect& rect) { m_frameRect = rect; }
112 
borderBoxRect()113     IntRect borderBoxRect() const { return IntRect(0, 0, width(), height()); }
borderBoundingBox()114     virtual IntRect borderBoundingBox() const { return borderBoxRect(); }
115 
116     // The content area of the box (excludes padding and border).
contentBoxRect()117     IntRect contentBoxRect() const { return IntRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); }
118     // The content box in absolute coords. Ignores transforms.
119     IntRect absoluteContentBox() const;
120     // The content box converted to absolute coords (taking transforms into account).
121     FloatQuad absoluteContentQuad() const;
122 
123     // Bounds of the outline box in absolute coords. Respects transforms
124     virtual IntRect outlineBoundsForRepaint(RenderBoxModelObject* /*repaintContainer*/, IntPoint* cachedOffsetToRepaintContainer) const;
125     virtual void addFocusRingRects(Vector<IntRect>&, int tx, int ty);
126 
127     // Use this with caution! No type checking is done!
128     RenderBox* previousSiblingBox() const;
129     RenderBox* nextSiblingBox() const;
130     RenderBox* parentBox() const;
131 
132     // Visual and layout overflow are in the coordinate space of the box.  This means that they aren't purely physical directions.
133     // For horizontal-tb and vertical-lr they will match physical directions, but for horizontal-bt and vertical-rl, the top/bottom and left/right
134     // respectively are flipped when compared to their physical counterparts.  For example minX is on the left in vertical-lr,
135     // but it is on the right in vertical-rl.
layoutOverflowRect()136     IntRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : clientBoxRect(); }
minYLayoutOverflow()137     int minYLayoutOverflow() const { return m_overflow? m_overflow->minYLayoutOverflow() : borderTop(); }
maxYLayoutOverflow()138     int maxYLayoutOverflow() const { return m_overflow ? m_overflow->maxYLayoutOverflow() : borderTop() + clientHeight(); }
minXLayoutOverflow()139     int minXLayoutOverflow() const { return m_overflow ? m_overflow->minXLayoutOverflow() : borderLeft(); }
maxXLayoutOverflow()140     int maxXLayoutOverflow() const { return m_overflow ? m_overflow->maxXLayoutOverflow() : borderLeft() + clientWidth(); }
logicalLeftLayoutOverflow()141     int logicalLeftLayoutOverflow() const { return style()->isHorizontalWritingMode() ? minXLayoutOverflow() : minYLayoutOverflow(); }
logicalRightLayoutOverflow()142     int logicalRightLayoutOverflow() const { return style()->isHorizontalWritingMode() ? maxXLayoutOverflow() : maxYLayoutOverflow(); }
143 
visualOverflowRect()144     IntRect visualOverflowRect() const { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); }
minYVisualOverflow()145     int minYVisualOverflow() const { return m_overflow? m_overflow->minYVisualOverflow() : 0; }
maxYVisualOverflow()146     int maxYVisualOverflow() const { return m_overflow ? m_overflow->maxYVisualOverflow() : height(); }
minXVisualOverflow()147     int minXVisualOverflow() const { return m_overflow ? m_overflow->minXVisualOverflow() : 0; }
maxXVisualOverflow()148     int maxXVisualOverflow() const { return m_overflow ? m_overflow->maxXVisualOverflow() : width(); }
logicalLeftVisualOverflow()149     int logicalLeftVisualOverflow() const { return style()->isHorizontalWritingMode() ? minXVisualOverflow() : minYVisualOverflow(); }
logicalRightVisualOverflow()150     int logicalRightVisualOverflow() const { return style()->isHorizontalWritingMode() ? maxXVisualOverflow() : maxYVisualOverflow(); }
151 
152     void addLayoutOverflow(const IntRect&);
153     void addVisualOverflow(const IntRect&);
154 
155     void addShadowOverflow();
addOverflowFromChild(RenderBox * child)156     void addOverflowFromChild(RenderBox* child) { addOverflowFromChild(child, IntSize(child->x(), child->y())); }
157     void addOverflowFromChild(RenderBox* child, const IntSize& delta);
158     void clearLayoutOverflow();
159 
160     void updateLayerTransform();
161 
162     void blockDirectionOverflow(bool isLineHorizontal, int& logicalTopLayoutOverflow, int& logicalBottomLayoutOverflow,
163                                 int& logicalTopVisualOverflow, int& logicalBottomVisualOverflow);
164 
contentWidth()165     int contentWidth() const { return clientWidth() - paddingLeft() - paddingRight(); }
contentHeight()166     int contentHeight() const { return clientHeight() - paddingTop() - paddingBottom(); }
contentLogicalWidth()167     int contentLogicalWidth() const { return style()->isHorizontalWritingMode() ? contentWidth() : contentHeight(); }
contentLogicalHeight()168     int contentLogicalHeight() const { return style()->isHorizontalWritingMode() ? contentHeight() : contentWidth(); }
169 
170     // IE extensions. Used to calculate offsetWidth/Height.  Overridden by inlines (RenderFlow)
171     // to return the remaining width on a given line (and the height of a single line).
offsetWidth()172     virtual int offsetWidth() const { return width(); }
offsetHeight()173     virtual int offsetHeight() const { return height(); }
174 
175     // More IE extensions.  clientWidth and clientHeight represent the interior of an object
176     // excluding border and scrollbar.  clientLeft/Top are just the borderLeftWidth and borderTopWidth.
clientLeft()177     int clientLeft() const { return borderLeft(); }
clientTop()178     int clientTop() const { return borderTop(); }
179     int clientWidth() const;
180     int clientHeight() const;
clientLogicalWidth()181     int clientLogicalWidth() const { return style()->isHorizontalWritingMode() ? clientWidth() : clientHeight(); }
clientLogicalHeight()182     int clientLogicalHeight() const { return style()->isHorizontalWritingMode() ? clientHeight() : clientWidth(); }
clientLogicalBottom()183     int clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); }
clientBoxRect()184     IntRect clientBoxRect() const { return IntRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); }
185 
186     // scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
187     // object has overflow:hidden/scroll/auto specified and also has overflow.
188     // scrollLeft/Top return the current scroll position.  These methods are virtual so that objects like
189     // textareas can scroll shadow content (but pretend that they are the objects that are
190     // scrolling).
191     virtual int scrollLeft() const;
192     virtual int scrollTop() const;
193     virtual int scrollWidth() const;
194     virtual int scrollHeight() const;
195     virtual void setScrollLeft(int);
196     virtual void setScrollTop(int);
197 
marginTop()198     virtual int marginTop() const { return m_marginTop; }
marginBottom()199     virtual int marginBottom() const { return m_marginBottom; }
marginLeft()200     virtual int marginLeft() const { return m_marginLeft; }
marginRight()201     virtual int marginRight() const { return m_marginRight; }
setMarginTop(int margin)202     void setMarginTop(int margin) { m_marginTop = margin; }
setMarginBottom(int margin)203     void setMarginBottom(int margin) { m_marginBottom = margin; }
setMarginLeft(int margin)204     void setMarginLeft(int margin) { m_marginLeft = margin; }
setMarginRight(int margin)205     void setMarginRight(int margin) { m_marginRight = margin; }
206     virtual int marginBefore() const;
207     virtual int marginAfter() const;
208     virtual int marginStart() const;
209     virtual int marginEnd() const;
210     void setMarginStart(int);
211     void setMarginEnd(int);
212     void setMarginBefore(int);
213     void setMarginAfter(int);
214 
215     // The following five functions are used to implement collapsing margins.
216     // All objects know their maximal positive and negative margins.  The
217     // formula for computing a collapsed margin is |maxPosMargin| - |maxNegmargin|.
218     // For a non-collapsing box, such as a leaf element, this formula will simply return
219     // the margin of the element.  Blocks override the maxMarginBefore and maxMarginAfter
220     // methods.
221     enum MarginSign { PositiveMargin, NegativeMargin };
isSelfCollapsingBlock()222     virtual bool isSelfCollapsingBlock() const { return false; }
collapsedMarginBefore()223     virtual int collapsedMarginBefore() const { return marginBefore(); }
collapsedMarginAfter()224     virtual int collapsedMarginAfter() const { return marginAfter(); }
225 
226     virtual void absoluteRects(Vector<IntRect>&, int tx, int ty);
227     virtual void absoluteQuads(Vector<FloatQuad>&);
228 
229     IntRect reflectionBox() const;
230     int reflectionOffset() const;
231     // Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
232     IntRect reflectedRect(const IntRect&) const;
233 
234     virtual void layout();
235     virtual void paint(PaintInfo&, int tx, int ty);
236     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, int x, int y, int tx, int ty, HitTestAction);
237 
238     virtual void destroy();
239 
240     virtual int minPreferredLogicalWidth() const;
241     virtual int maxPreferredLogicalWidth() const;
242 
243     int overrideSize() const;
244     int overrideWidth() const;
245     int overrideHeight() const;
246     virtual void setOverrideSize(int);
247 
248     virtual IntSize offsetFromContainer(RenderObject*, const IntPoint&) const;
249 
250     int computeBorderBoxLogicalWidth(int width) const;
251     int computeBorderBoxLogicalHeight(int height) const;
252     int computeContentBoxLogicalWidth(int width) const;
253     int computeContentBoxLogicalHeight(int height) const;
254 
borderFitAdjust(int &,int &)255     virtual void borderFitAdjust(int& /*x*/, int& /*w*/) const { } // Shrink the box in which the border paints if border-fit is set.
256 
257     // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end
258     // of the containing block.
259     void computeInlineDirectionMargins(RenderBlock* containingBlock, int containerWidth, int childWidth);
260 
261     // Used to resolve margins in the containing block's block-flow direction.
262     void computeBlockDirectionMargins(RenderBlock* containingBlock);
263 
264     void positionLineBox(InlineBox*);
265 
266     virtual InlineBox* createInlineBox();
267     void dirtyLineBoxes(bool fullLayout);
268 
269     // For inline replaced elements, this function returns the inline box that owns us.  Enables
270     // the replaced RenderObject to quickly determine what line it is contained on and to easily
271     // iterate over structures on the line.
inlineBoxWrapper()272     InlineBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; }
setInlineBoxWrapper(InlineBox * boxWrapper)273     void setInlineBoxWrapper(InlineBox* boxWrapper) { m_inlineBoxWrapper = boxWrapper; }
274     void deleteLineBoxWrapper();
275 
276     virtual IntRect clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer);
277     virtual void computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect&, bool fixed = false);
278 
279     virtual void repaintDuringLayoutIfMoved(const IntRect&);
280 
281     virtual int containingBlockLogicalWidthForContent() const;
282     int perpendicularContainingBlockLogicalHeight() const;
283 
284     virtual void computeLogicalWidth();
285     virtual void computeLogicalHeight();
286 
stretchesToViewport()287     bool stretchesToViewport() const
288     {
289         return document()->inQuirksMode() && style()->logicalHeight().isAuto() && !isFloatingOrPositioned() && (isRoot() || isBody());
290     }
291 
intrinsicSize()292     virtual IntSize intrinsicSize() const { return IntSize(); }
intrinsicLogicalWidth()293     int intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
intrinsicLogicalHeight()294     int intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
295 
296     // Whether or not the element shrinks to its intrinsic width (rather than filling the width
297     // of a containing block).  HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
298     bool sizesToIntrinsicLogicalWidth(LogicalWidthType) const;
stretchesToMinIntrinsicLogicalWidth()299     virtual bool stretchesToMinIntrinsicLogicalWidth() const { return false; }
300 
301     int computeLogicalWidthUsing(LogicalWidthType, int availableLogicalWidth);
302     int computeLogicalHeightUsing(const Length& height);
303     int computeReplacedLogicalWidthUsing(Length width) const;
304     int computeReplacedLogicalHeightUsing(Length height) const;
305 
306     virtual int computeReplacedLogicalWidth(bool includeMaxWidth = true) const;
307     virtual int computeReplacedLogicalHeight() const;
308 
309     int computePercentageLogicalHeight(const Length& height);
310 
311     // Block flows subclass availableWidth to handle multi column layout (shrinking the width available to children when laying out.)
availableLogicalWidth()312     virtual int availableLogicalWidth() const { return contentLogicalWidth(); }
313     int availableLogicalHeight() const;
314     int availableLogicalHeightUsing(const Length&) const;
315 
316     // There are a few cases where we need to refer specifically to the available physical width and available physical height.
317     // Relative positioning is one of those cases, since left/top offsets are physical.
availableWidth()318     int availableWidth() const { return style()->isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(); }
availableHeight()319     int availableHeight() const { return style()->isHorizontalWritingMode() ? availableLogicalHeight() : availableLogicalWidth(); }
320 
321     virtual int verticalScrollbarWidth() const;
322     int horizontalScrollbarHeight() const;
scrollbarLogicalHeight()323     int scrollbarLogicalHeight() const { return style()->isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); }
324     virtual bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0);
325     virtual bool logicalScroll(ScrollLogicalDirection, ScrollGranularity, float multiplier = 1, Node** stopNode = 0);
326     bool canBeScrolledAndHasScrollableArea() const;
327     virtual bool canBeProgramaticallyScrolled(bool) const;
328     virtual void autoscroll();
stopAutoscroll()329     virtual void stopAutoscroll() { }
330     virtual void panScroll(const IntPoint&);
hasAutoVerticalScrollbar()331     bool hasAutoVerticalScrollbar() const { return hasOverflowClip() && (style()->overflowY() == OAUTO || style()->overflowY() == OOVERLAY); }
hasAutoHorizontalScrollbar()332     bool hasAutoHorizontalScrollbar() const { return hasOverflowClip() && (style()->overflowX() == OAUTO || style()->overflowX() == OOVERLAY); }
scrollsOverflow()333     bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); }
scrollsOverflowX()334     bool scrollsOverflowX() const { return hasOverflowClip() && (style()->overflowX() == OSCROLL || hasAutoHorizontalScrollbar()); }
scrollsOverflowY()335     bool scrollsOverflowY() const { return hasOverflowClip() && (style()->overflowY() == OSCROLL || hasAutoVerticalScrollbar()); }
336 
337     virtual IntRect localCaretRect(InlineBox*, int caretOffset, int* extraWidthToEndOfLine = 0);
338 
339     virtual IntRect overflowClipRect(int tx, int ty, OverlayScrollbarSizeRelevancy relevancy = IgnoreOverlayScrollbarSize);
340     IntRect clipRect(int tx, int ty);
hasControlClip()341     virtual bool hasControlClip() const { return false; }
controlClipRect(int,int)342     virtual IntRect controlClipRect(int /*tx*/, int /*ty*/) const { return IntRect(); }
343     bool pushContentsClip(PaintInfo&, int tx, int ty);
344     void popContentsClip(PaintInfo&, PaintPhase originalPhase, int tx, int ty);
345 
paintObject(PaintInfo &,int,int)346     virtual void paintObject(PaintInfo&, int /*tx*/, int /*ty*/) { ASSERT_NOT_REACHED(); }
347     virtual void paintBoxDecorations(PaintInfo&, int tx, int ty);
348     virtual void paintMask(PaintInfo&, int tx, int ty);
349     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
350 
351     // Called when a positioned object moves but doesn't necessarily change size.  A simplified layout is attempted
352     // that just updates the object's position. If the size does change, the object remains dirty.
tryLayoutDoingPositionedMovementOnly()353     bool tryLayoutDoingPositionedMovementOnly()
354     {
355         int oldWidth = width();
356         computeLogicalWidth();
357         // If we shrink to fit our width may have changed, so we still need full layout.
358         if (oldWidth != width())
359             return false;
360         computeLogicalHeight();
361         return true;
362     }
363 
364     IntRect maskClipRect();
365 
366     virtual VisiblePosition positionForPoint(const IntPoint&);
367 
368     void removeFloatingOrPositionedChildFromBlockLists();
369 
370     RenderLayer* enclosingFloatPaintingLayer() const;
371 
firstLineBoxBaseline()372     virtual int firstLineBoxBaseline() const { return -1; }
lastLineBoxBaseline()373     virtual int lastLineBoxBaseline() const { return -1; }
374 
375     bool shrinkToAvoidFloats() const;
376     virtual bool avoidsFloats() const;
377 
markForPaginationRelayoutIfNeeded()378     virtual void markForPaginationRelayoutIfNeeded() { }
379 
isWritingModeRoot()380     bool isWritingModeRoot() const { return !parent() || parent()->style()->writingMode() != style()->writingMode(); }
381 
isDeprecatedFlexItem()382     bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrPositioned() && parent() && parent()->isFlexibleBox(); }
383 
384     virtual int lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
385     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
386 
387     enum FlippingAdjustment { ChildToParentFlippingAdjustment, ParentToChildFlippingAdjustment };
388     IntPoint flipForWritingMode(const RenderBox* child, const IntPoint&, FlippingAdjustment) const;
389     int flipForWritingMode(int position) const; // The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
390     IntPoint flipForWritingMode(const IntPoint&) const;
391     IntPoint flipForWritingModeIncludingColumns(const IntPoint&) const;
392     IntSize flipForWritingMode(const IntSize&) const;
393     void flipForWritingMode(IntRect&) const;
394     FloatPoint flipForWritingMode(const FloatPoint&) const;
395     void flipForWritingMode(FloatRect&) const;
396     IntSize locationOffsetIncludingFlipping() const;
397 
398     IntRect logicalVisualOverflowRectForPropagation(RenderStyle*) const;
399     IntRect visualOverflowRectForPropagation(RenderStyle*) const;
400     IntRect logicalLayoutOverflowRectForPropagation(RenderStyle*) const;
401     IntRect layoutOverflowRectForPropagation(RenderStyle*) const;
402 
hasRenderOverflow()403     RenderOverflow* hasRenderOverflow() const { return m_overflow.get(); }
404 
405 protected:
406     virtual void styleWillChange(StyleDifference, const RenderStyle* newStyle);
407     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
408     virtual void updateBoxModelInfoFromStyle();
409 
410     void paintFillLayer(const PaintInfo&, const Color&, const FillLayer*, int tx, int ty, int width, int height, BackgroundBleedAvoidance, CompositeOperator, RenderObject* backgroundObject);
411     void paintFillLayers(const PaintInfo&, const Color&, const FillLayer*, int tx, int ty, int width, int height, BackgroundBleedAvoidance = BackgroundBleedNone, CompositeOperator = CompositeSourceOver, RenderObject* backgroundObject = 0);
412 
413     void paintBoxDecorationsWithSize(PaintInfo&, int tx, int ty, int width, int height);
414     void paintMaskImages(const PaintInfo&, int tx, int ty, int width, int height);
415 
416 #if PLATFORM(MAC)
417     void paintCustomHighlight(int tx, int ty, const AtomicString& type, bool behindText);
418 #endif
419 
420     void computePositionedLogicalWidth();
421 
shouldComputeSizeAsReplaced()422     virtual bool shouldComputeSizeAsReplaced() const { return isReplaced() && !isInlineBlockOrInlineTable(); }
423 
424     virtual void mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState&) const;
425     virtual void mapAbsoluteToLocalPoint(bool fixed, bool useTransforms, TransformState&) const;
426 
427     void paintRootBoxFillLayers(const PaintInfo&);
428 
429 private:
430     bool includeVerticalScrollbarSize() const;
431     bool includeHorizontalScrollbarSize() const;
432 
433     // Returns true if we did a full repaint
434     bool repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground);
435 
436     int containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
437     int containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
438 
439     void computePositionedLogicalHeight();
440     void computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
441                                             int containerLogicalWidth, int bordersPlusPadding,
442                                             Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
443                                             int& logicalWidthValue, int& marginLogicalLeftValue, int& marginLogicalRightValue, int& logicalLeftPos);
444     void computePositionedLogicalHeightUsing(Length logicalHeight, const RenderBoxModelObject* containerBlock,
445                                              int containerLogicalHeight, int bordersPlusPadding,
446                                              Length logicalTop, Length logicalBottom, Length marginLogicalTop, Length marginLogicalBottom,
447                                              int& logicalHeightValue, int& marginLogicalTopValue, int& marginLogicalBottomValue, int& logicalTopPos);
448 
449     void computePositionedLogicalHeightReplaced();
450     void computePositionedLogicalWidthReplaced();
451 
452     // This function calculates the minimum and maximum preferred widths for an object.
453     // These values are used in shrink-to-fit layout systems.
454     // These include tables, positioned objects, floats and flexible boxes.
computePreferredLogicalWidths()455     virtual void computePreferredLogicalWidths() { setPreferredLogicalWidthsDirty(false); }
456 
457     BackgroundBleedAvoidance determineBackgroundBleedAvoidance(GraphicsContext*) const;
458 
459 private:
460     // The width/height of the contents + borders + padding.  The x/y location is relative to our container (which is not always our parent).
461     IntRect m_frameRect;
462 
463 protected:
464     int m_marginLeft;
465     int m_marginRight;
466     int m_marginTop;
467     int m_marginBottom;
468 
469     // The preferred logical width of the element if it were to break its lines at every possible opportunity.
470     int m_minPreferredLogicalWidth;
471 
472     // The preferred logical width of the element if it never breaks any lines at all.
473     int m_maxPreferredLogicalWidth;
474 
475     // For inline replaced elements, the inline box that owns us.
476     InlineBox* m_inlineBoxWrapper;
477 
478     // Our overflow information.
479     OwnPtr<RenderOverflow> m_overflow;
480 
481 private:
482     // Used to store state between styleWillChange and styleDidChange
483     static bool s_hadOverflowClip;
484 };
485 
toRenderBox(RenderObject * object)486 inline RenderBox* toRenderBox(RenderObject* object)
487 {
488     ASSERT(!object || object->isBox());
489     return static_cast<RenderBox*>(object);
490 }
491 
toRenderBox(const RenderObject * object)492 inline const RenderBox* toRenderBox(const RenderObject* object)
493 {
494     ASSERT(!object || object->isBox());
495     return static_cast<const RenderBox*>(object);
496 }
497 
498 // This will catch anyone doing an unnecessary cast.
499 void toRenderBox(const RenderBox*);
500 
previousSiblingBox()501 inline RenderBox* RenderBox::previousSiblingBox() const
502 {
503     return toRenderBox(previousSibling());
504 }
505 
nextSiblingBox()506 inline RenderBox* RenderBox::nextSiblingBox() const
507 {
508     return toRenderBox(nextSibling());
509 }
510 
parentBox()511 inline RenderBox* RenderBox::parentBox() const
512 {
513     return toRenderBox(parent());
514 }
515 
firstChildBox()516 inline RenderBox* RenderBox::firstChildBox() const
517 {
518     return toRenderBox(firstChild());
519 }
520 
lastChildBox()521 inline RenderBox* RenderBox::lastChildBox() const
522 {
523     return toRenderBox(lastChild());
524 }
525 
526 } // namespace WebCore
527 
528 #endif // RenderBox_h
529