1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
|
/*
* Copyright (C) 2003, 2009 Apple Inc. All rights reserved.
*
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
*
* Other contributors:
* Robert O'Callahan <roc+@cs.cmu.edu>
* David Baron <dbaron@fas.harvard.edu>
* Christian Biesinger <cbiesinger@web.de>
* Randall Jesup <rjesup@wgate.com>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Josh Soref <timeless@mac.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
*/
#ifndef RenderLayer_h
#define RenderLayer_h
#include "RenderBox.h"
#include "ScrollBehavior.h"
#include "ScrollbarClient.h"
#include "Timer.h"
#include <wtf/OwnPtr.h>
namespace WebCore {
class CachedResource;
class HitTestRequest;
class HitTestResult;
class HitTestingTransformState;
class RenderFrameSet;
class RenderMarquee;
class RenderReplica;
class RenderScrollbarPart;
class RenderStyle;
class RenderTable;
class RenderText;
class RenderView;
class Scrollbar;
class TransformationMatrix;
#if USE(ACCELERATED_COMPOSITING)
class RenderLayerBacking;
class RenderLayerCompositor;
#endif
class ClipRects {
public:
ClipRects()
: m_refCnt(0)
, m_fixed(false)
{
}
ClipRects(const IntRect& r)
: m_overflowClipRect(r)
, m_fixedClipRect(r)
, m_posClipRect(r)
, m_refCnt(0)
, m_fixed(false)
{
}
ClipRects(const ClipRects& other)
: m_overflowClipRect(other.overflowClipRect())
, m_fixedClipRect(other.fixedClipRect())
, m_posClipRect(other.posClipRect())
, m_refCnt(0)
, m_fixed(other.fixed())
{
}
void reset(const IntRect& r)
{
m_overflowClipRect = r;
m_fixedClipRect = r;
m_posClipRect = r;
m_fixed = false;
}
const IntRect& overflowClipRect() const { return m_overflowClipRect; }
void setOverflowClipRect(const IntRect& r) { m_overflowClipRect = r; }
const IntRect& fixedClipRect() const { return m_fixedClipRect; }
void setFixedClipRect(const IntRect&r) { m_fixedClipRect = r; }
const IntRect& posClipRect() const { return m_posClipRect; }
void setPosClipRect(const IntRect& r) { m_posClipRect = r; }
bool fixed() const { return m_fixed; }
void setFixed(bool fixed) { m_fixed = fixed; }
void ref() { m_refCnt++; }
void deref(RenderArena* renderArena) { if (--m_refCnt == 0) destroy(renderArena); }
void destroy(RenderArena*);
// Overloaded new operator.
void* operator new(size_t, RenderArena*) throw();
// Overridden to prevent the normal delete from being called.
void operator delete(void*, size_t);
bool operator==(const ClipRects& other) const
{
return m_overflowClipRect == other.overflowClipRect() &&
m_fixedClipRect == other.fixedClipRect() &&
m_posClipRect == other.posClipRect() &&
m_fixed == other.fixed();
}
ClipRects& operator=(const ClipRects& other)
{
m_overflowClipRect = other.overflowClipRect();
m_fixedClipRect = other.fixedClipRect();
m_posClipRect = other.posClipRect();
m_fixed = other.fixed();
return *this;
}
private:
// The normal operator new is disallowed on all render objects.
void* operator new(size_t) throw();
private:
IntRect m_overflowClipRect;
IntRect m_fixedClipRect;
IntRect m_posClipRect;
unsigned m_refCnt : 31;
bool m_fixed : 1;
};
class RenderLayer : public ScrollbarClient {
public:
friend class RenderReplica;
RenderLayer(RenderBoxModelObject*);
~RenderLayer();
RenderBoxModelObject* renderer() const { return m_renderer; }
RenderBox* renderBox() const { return m_renderer && m_renderer->isBox() ? toRenderBox(m_renderer) : 0; }
RenderLayer* parent() const { return m_parent; }
RenderLayer* previousSibling() const { return m_previous; }
RenderLayer* nextSibling() const { return m_next; }
RenderLayer* firstChild() const { return m_first; }
RenderLayer* lastChild() const { return m_last; }
void addChild(RenderLayer* newChild, RenderLayer* beforeChild = 0);
RenderLayer* removeChild(RenderLayer*);
void removeOnlyThisLayer();
void insertOnlyThisLayer();
void repaintIncludingDescendants();
#if USE(ACCELERATED_COMPOSITING)
// Indicate that the layer contents need to be repainted. Only has an effect
// if layer compositing is being used,
void setBackingNeedsRepaint();
void setBackingNeedsRepaintInRect(const IntRect& r); // r is in the coordinate space of the layer's render object
void repaintIncludingNonCompositingDescendants(RenderBoxModelObject* repaintContainer);
#endif
void styleChanged(StyleDifference, const RenderStyle*);
RenderMarquee* marquee() const { return m_marquee; }
bool isNormalFlowOnly() const { return m_isNormalFlowOnly; }
bool isSelfPaintingLayer() const;
bool requiresSlowRepaints() const;
bool isTransparent() const;
RenderLayer* transparentPaintingAncestor();
void beginTransparencyLayers(GraphicsContext*, const RenderLayer* rootLayer, PaintBehavior);
bool hasReflection() const { return renderer()->hasReflection(); }
bool isReflection() const { return renderer()->isReplica(); }
RenderReplica* reflection() const { return m_reflection; }
RenderLayer* reflectionLayer() const;
const RenderLayer* root() const
{
const RenderLayer* curr = this;
while (curr->parent())
curr = curr->parent();
return curr;
}
int x() const { return m_x; }
int y() const { return m_y; }
void setLocation(int x, int y)
{
m_x = x;
m_y = y;
}
int width() const { return m_width; }
int height() const { return m_height; }
IntSize size() const { return IntSize(m_width, m_height); }
void setWidth(int w) { m_width = w; }
void setHeight(int h) { m_height = h; }
int scrollWidth();
int scrollHeight();
void panScrollFromPoint(const IntPoint&);
// Scrolling methods for layers that can scroll their overflow.
void scrollByRecursively(int xDelta, int yDelta);
IntSize scrolledContentOffset() const { return IntSize(scrollXOffset() + m_scrollLeftOverflow, scrollYOffset()); }
int scrollXOffset() const { return m_scrollX + m_scrollOriginX; }
int scrollYOffset() const { return m_scrollY; }
void scrollToOffset(int x, int y, bool updateScrollbars = true, bool repaint = true);
void scrollToXOffset(int x) { scrollToOffset(x, m_scrollY); }
void scrollToYOffset(int y) { scrollToOffset(m_scrollX + m_scrollOriginX, y); }
void scrollRectToVisible(const IntRect&, bool scrollToAnchor = false, const ScrollAlignment& alignX = ScrollAlignment::alignCenterIfNeeded, const ScrollAlignment& alignY = ScrollAlignment::alignCenterIfNeeded);
IntRect getRectToExpose(const IntRect& visibleRect, const IntRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
void setHasHorizontalScrollbar(bool);
void setHasVerticalScrollbar(bool);
PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
void destroyScrollbar(ScrollbarOrientation);
Scrollbar* horizontalScrollbar() const { return m_hBar.get(); }
Scrollbar* verticalScrollbar() const { return m_vBar.get(); }
int verticalScrollbarWidth() const;
int horizontalScrollbarHeight() const;
bool hasOverflowControls() const;
#if ENABLE(ANDROID_OVERFLOW_SCROLL)
bool hasOverflowScroll() const;
#endif
void positionOverflowControls(int tx, int ty);
bool isPointInResizeControl(const IntPoint& absolutePoint) const;
bool hitTestOverflowControls(HitTestResult&, const IntPoint& localPoint);
IntSize offsetFromResizeCorner(const IntPoint& absolutePoint) const;
void paintOverflowControls(GraphicsContext*, int tx, int ty, const IntRect& damageRect);
void paintScrollCorner(GraphicsContext*, int tx, int ty, const IntRect& damageRect);
void paintResizer(GraphicsContext*, int tx, int ty, const IntRect& damageRect);
void updateScrollInfoAfterLayout();
bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1.0f);
void autoscroll();
void resize(const PlatformMouseEvent&, const IntSize&);
bool inResizeMode() const { return m_inResizeMode; }
void setInResizeMode(bool b) { m_inResizeMode = b; }
bool isRootLayer() const { return renderer()->isRenderView(); }
#if USE(ACCELERATED_COMPOSITING)
RenderLayerCompositor* compositor() const;
// Notification from the renderer that its content changed (e.g. current frame of image changed).
// Allows updates of layer content without repainting.
void rendererContentChanged();
#endif
// Returns true if the accelerated compositing is enabled
bool hasAcceleratedCompositing() const;
void updateLayerPosition();
enum UpdateLayerPositionsFlag {
DoFullRepaint = 1,
CheckForRepaint = 1 << 1,
IsCompositingUpdateRoot = 1 << 2,
UpdateCompositingLayers = 1 << 3,
UpdatePagination = 1 << 4
};
typedef unsigned UpdateLayerPositionsFlags;
void updateLayerPositions(UpdateLayerPositionsFlags = DoFullRepaint | IsCompositingUpdateRoot | UpdateCompositingLayers, IntPoint* cachedOffset = 0);
void updateTransform();
void relativePositionOffset(int& relX, int& relY) const { relX += m_relX; relY += m_relY; }
IntSize relativePositionOffset() const { return IntSize(m_relX, m_relY); }
void clearClipRectsIncludingDescendants();
void clearClipRects();
void addBlockSelectionGapsBounds(const IntRect&);
void clearBlockSelectionGapsBounds();
void repaintBlockSelectionGaps();
// Get the enclosing stacking context for this layer. A stacking context is a layer
// that has a non-auto z-index.
RenderLayer* stackingContext() const;
#if ENABLE(COMPOSITED_FIXED_ELEMENTS)
bool isFixed() const { return renderer()->isPositioned() && renderer()->style()->position() == FixedPosition; }
// If fixed elements are composited, they will be containing children
bool isStackingContext() const {
return !hasAutoZIndex() || renderer()->isRenderView() || (isComposited() && isFixed());
}
#else
bool isStackingContext() const { return !hasAutoZIndex() || renderer()->isRenderView() ; }
#endif
void dirtyZOrderLists();
void dirtyStackingContextZOrderLists();
void updateZOrderLists();
Vector<RenderLayer*>* posZOrderList() const { return m_posZOrderList; }
Vector<RenderLayer*>* negZOrderList() const { return m_negZOrderList; }
void dirtyNormalFlowList();
void updateNormalFlowList();
Vector<RenderLayer*>* normalFlowList() const { return m_normalFlowList; }
bool hasVisibleContent() const { return m_hasVisibleContent; }
bool hasVisibleDescendant() const { return m_hasVisibleDescendant; }
void setHasVisibleContent(bool);
void dirtyVisibleContentStatus();
// Gets the nearest enclosing positioned ancestor layer (also includes
// the <html> layer and the root layer).
RenderLayer* enclosingPositionedAncestor() const;
// The layer relative to which clipping rects for this layer are computed.
RenderLayer* clippingRoot() const;
#if USE(ACCELERATED_COMPOSITING)
// Enclosing compositing layer; if includeSelf is true, may return this.
RenderLayer* enclosingCompositingLayer(bool includeSelf = true) const;
// Ancestor compositing layer, excluding this.
RenderLayer* ancestorCompositingLayer() const { return enclosingCompositingLayer(false); }
#endif
void convertToLayerCoords(const RenderLayer* ancestorLayer, int& x, int& y) const;
bool hasAutoZIndex() const { return renderer()->style()->hasAutoZIndex(); }
int zIndex() const { return renderer()->style()->zIndex(); }
// The two main functions that use the layer system. The paint method
// paints the layers that intersect the damage rect from back to
// front. The hitTest method looks for mouse events by walking
// layers that intersect the point from front to back.
void paint(GraphicsContext*, const IntRect& damageRect, PaintBehavior = PaintBehaviorNormal, RenderObject* paintingRoot = 0);
bool hitTest(const HitTestRequest&, HitTestResult&);
// This method figures out our layerBounds in coordinates relative to
// |rootLayer}. It also computes our background and foreground clip rects
// for painting/event handling.
void calculateRects(const RenderLayer* rootLayer, const IntRect& paintDirtyRect, IntRect& layerBounds,
IntRect& backgroundRect, IntRect& foregroundRect, IntRect& outlineRect, bool temporaryClipRects = false) const;
// Compute and cache clip rects computed with the given layer as the root
void updateClipRects(const RenderLayer* rootLayer);
// Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors
// (rather than computing them all from scratch up the parent chain).
void calculateClipRects(const RenderLayer* rootLayer, ClipRects&, bool useCached = false) const;
ClipRects* clipRects() const { return m_clipRects; }
IntRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space.
IntRect selfClipRect() const; // Returns the background clip rect of the layer in the document's coordinate space.
bool intersectsDamageRect(const IntRect& layerBounds, const IntRect& damageRect, const RenderLayer* rootLayer) const;
// Bounding box relative to some ancestor layer.
IntRect boundingBox(const RenderLayer* rootLayer) const;
// Bounding box in the coordinates of this layer.
IntRect localBoundingBox() const;
// Bounding box relative to the root.
IntRect absoluteBoundingBox() const;
void updateHoverActiveState(const HitTestRequest&, HitTestResult&);
// Return a cached repaint rect, computed relative to the layer renderer's containerForRepaint.
IntRect repaintRect() const { return m_repaintRect; }
IntRect repaintRectIncludingDescendants() const;
void computeRepaintRects();
void updateRepaintRectsAfterScroll(bool fixed = false);
void setNeedsFullRepaint(bool f = true) { m_needsFullRepaint = f; }
int staticX() const { return m_staticX; }
int staticY() const { return m_staticY; }
void setStaticX(int staticX) { m_staticX = staticX; }
void setStaticY(int staticY) { m_staticY = staticY; }
bool hasTransform() const { return renderer()->hasTransform(); }
// Note that this transform has the transform-origin baked in.
TransformationMatrix* transform() const { return m_transform.get(); }
// currentTransform computes a transform which takes accelerated animations into account. The
// resulting transform has transform-origin baked in. If the layer does not have a transform,
// returns the identity matrix.
TransformationMatrix currentTransform() const;
TransformationMatrix renderableTransform(PaintBehavior) const;
// Get the perspective transform, which is applied to transformed sublayers.
// Returns true if the layer has a -webkit-perspective.
// Note that this transform has the perspective-origin baked in.
TransformationMatrix perspectiveTransform() const;
FloatPoint perspectiveOrigin() const;
bool preserves3D() const { return renderer()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
bool has3DTransform() const { return m_transform && !m_transform->isAffine(); }
// Overloaded new operator. Derived classes must override operator new
// in order to allocate out of the RenderArena.
void* operator new(size_t, RenderArena*) throw();
// Overridden to prevent the normal delete from being called.
void operator delete(void*, size_t);
#if USE(ACCELERATED_COMPOSITING)
bool isComposited() const { return m_backing != 0; }
bool hasCompositedMask() const;
RenderLayerBacking* backing() const { return m_backing.get(); }
RenderLayerBacking* ensureBacking();
void clearBacking();
#else
bool isComposited() const { return false; }
bool hasCompositedMask() const { return false; }
#endif
bool paintsWithTransparency(PaintBehavior paintBehavior) const
{
return isTransparent() && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || !isComposited());
}
bool paintsWithTransform(PaintBehavior paintBehavior) const
{
return transform() && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || !isComposited());
}
private:
// The normal operator new is disallowed on all render objects.
void* operator new(size_t) throw();
private:
void setNextSibling(RenderLayer* next) { m_next = next; }
void setPreviousSibling(RenderLayer* prev) { m_previous = prev; }
void setParent(RenderLayer* parent);
void setFirstChild(RenderLayer* first) { m_first = first; }
void setLastChild(RenderLayer* last) { m_last = last; }
int renderBoxX() const { return renderer()->isBox() ? toRenderBox(renderer())->x() : 0; }
int renderBoxY() const { return renderer()->isBox() ? toRenderBox(renderer())->y() : 0; }
void collectLayers(Vector<RenderLayer*>*&, Vector<RenderLayer*>*&);
void updateLayerListsIfNeeded();
void updateCompositingAndLayerListsIfNeeded();
enum PaintLayerFlag {
PaintLayerHaveTransparency = 1,
PaintLayerAppliedTransform = 1 << 1,
PaintLayerTemporaryClipRects = 1 << 2,
PaintLayerPaintingReflection = 1 << 3
};
typedef unsigned PaintLayerFlags;
void paintLayer(RenderLayer* rootLayer, GraphicsContext*, const IntRect& paintDirtyRect,
PaintBehavior, RenderObject* paintingRoot, OverlapTestRequestMap* = 0,
PaintLayerFlags = 0);
void paintList(Vector<RenderLayer*>*, RenderLayer* rootLayer, GraphicsContext* p,
const IntRect& paintDirtyRect, PaintBehavior,
RenderObject* paintingRoot, OverlapTestRequestMap*,
PaintLayerFlags);
void paintPaginatedChildLayer(RenderLayer* childLayer, RenderLayer* rootLayer, GraphicsContext*,
const IntRect& paintDirtyRect, PaintBehavior,
RenderObject* paintingRoot, OverlapTestRequestMap*,
PaintLayerFlags);
void paintChildLayerIntoColumns(RenderLayer* childLayer, RenderLayer* rootLayer, GraphicsContext*,
const IntRect& paintDirtyRect, PaintBehavior,
RenderObject* paintingRoot, OverlapTestRequestMap*,
PaintLayerFlags, const Vector<RenderLayer*>& columnLayers, size_t columnIndex);
RenderLayer* hitTestLayer(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const IntRect& hitTestRect, const IntPoint& hitTestPoint, bool appliedTransform,
const HitTestingTransformState* transformState = 0, double* zOffset = 0);
RenderLayer* hitTestList(Vector<RenderLayer*>*, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const IntRect& hitTestRect, const IntPoint& hitTestPoint,
const HitTestingTransformState* transformState, double* zOffsetForDescendants, double* zOffset,
const HitTestingTransformState* unflattenedTransformState, bool depthSortDescendants);
RenderLayer* hitTestPaginatedChildLayer(RenderLayer* childLayer, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const IntRect& hitTestRect, const IntPoint& hitTestPoint,
const HitTestingTransformState* transformState, double* zOffset);
RenderLayer* hitTestChildLayerColumns(RenderLayer* childLayer, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const IntRect& hitTestRect, const IntPoint& hitTestPoint,
const HitTestingTransformState* transformState, double* zOffset,
const Vector<RenderLayer*>& columnLayers, size_t columnIndex);
PassRefPtr<HitTestingTransformState> createLocalTransformState(RenderLayer* rootLayer, RenderLayer* containerLayer,
const IntRect& hitTestRect, const IntPoint& hitTestPoint,
const HitTestingTransformState* containerTransformState) const;
bool hitTestContents(const HitTestRequest&, HitTestResult&, const IntRect& layerBounds, const IntPoint& hitTestPoint, HitTestFilter) const;
void computeScrollDimensions(bool* needHBar = 0, bool* needVBar = 0);
bool shouldBeNormalFlowOnly() const;
// ScrollBarClient interface
virtual void valueChanged(Scrollbar*);
virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&);
virtual bool isActive() const;
virtual bool scrollbarCornerPresent() const;
virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const;
virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const;
virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const;
virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const;
IntSize scrollbarOffset(const Scrollbar*) const;
void updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow);
void childVisibilityChanged(bool newVisibility);
void dirtyVisibleDescendantStatus();
void updateVisibilityStatus();
// This flag is computed by RenderLayerCompositor, which knows more about 3d hierarchies than we do.
void setHas3DTransformedDescendant(bool b) { m_has3DTransformedDescendant = b; }
bool has3DTransformedDescendant() const { return m_has3DTransformedDescendant; }
void dirty3DTransformedDescendantStatus();
// Both updates the status, and returns true if descendants of this have 3d.
bool update3DTransformedDescendantStatus();
Node* enclosingElement() const;
void createReflection();
void removeReflection();
void updateReflectionStyle();
bool paintingInsideReflection() const { return m_paintingInsideReflection; }
void setPaintingInsideReflection(bool b) { m_paintingInsideReflection = b; }
void parentClipRects(const RenderLayer* rootLayer, ClipRects&, bool temporaryClipRects = false) const;
IntRect backgroundClipRect(const RenderLayer* rootLayer, bool temporaryClipRects) const;
RenderLayer* enclosingTransformedAncestor() const;
// Convert a point in absolute coords into layer coords, taking transforms into account
IntPoint absoluteToContents(const IntPoint&) const;
void updateScrollCornerStyle();
void updateResizerStyle();
void updatePagination();
bool isPaginated() const { return m_isPaginated; }
#if USE(ACCELERATED_COMPOSITING)
bool hasCompositingDescendant() const { return m_hasCompositingDescendant; }
void setHasCompositingDescendant(bool b) { m_hasCompositingDescendant = b; }
bool mustOverlapCompositedLayers() const { return m_mustOverlapCompositedLayers; }
void setMustOverlapCompositedLayers(bool b) { m_mustOverlapCompositedLayers = b; }
#endif
private:
friend class RenderLayerBacking;
friend class RenderLayerCompositor;
friend class RenderBoxModelObject;
// Only safe to call from RenderBoxModelObject::destroyLayer(RenderArena*)
void destroy(RenderArena*);
protected:
RenderBoxModelObject* m_renderer;
RenderLayer* m_parent;
RenderLayer* m_previous;
RenderLayer* m_next;
RenderLayer* m_first;
RenderLayer* m_last;
IntRect m_repaintRect; // Cached repaint rects. Used by layout.
IntRect m_outlineBox;
// Our current relative position offset.
int m_relX;
int m_relY;
// Our (x,y) coordinates are in our parent layer's coordinate space.
int m_x;
int m_y;
// The layer's width/height
int m_width;
int m_height;
// Our scroll offsets if the view is scrolled.
int m_scrollX;
int m_scrollY;
int m_scrollOriginX; // only non-zero for rtl content
int m_scrollLeftOverflow; // only non-zero for rtl content
// The width/height of our scrolled area.
int m_scrollWidth;
int m_scrollHeight;
// For layers with overflow, we have a pair of scrollbars.
RefPtr<Scrollbar> m_hBar;
RefPtr<Scrollbar> m_vBar;
// Keeps track of whether the layer is currently resizing, so events can cause resizing to start and stop.
bool m_inResizeMode;
// For layers that establish stacking contexts, m_posZOrderList holds a sorted list of all the
// descendant layers within the stacking context that have z-indices of 0 or greater
// (auto will count as 0). m_negZOrderList holds descendants within our stacking context with negative
// z-indices.
Vector<RenderLayer*>* m_posZOrderList;
Vector<RenderLayer*>* m_negZOrderList;
// This list contains child layers that cannot create stacking contexts. For now it is just
// overflow layers, but that may change in the future.
Vector<RenderLayer*>* m_normalFlowList;
ClipRects* m_clipRects; // Cached clip rects used when painting and hit testing.
#ifndef NDEBUG
const RenderLayer* m_clipRectsRoot; // Root layer used to compute clip rects.
#endif
bool m_scrollDimensionsDirty : 1;
bool m_zOrderListsDirty : 1;
bool m_normalFlowListDirty: 1;
bool m_isNormalFlowOnly : 1;
bool m_usedTransparency : 1; // Tracks whether we need to close a transparent layer, i.e., whether
// we ended up painting this layer or any descendants (and therefore need to
// blend).
bool m_paintingInsideReflection : 1; // A state bit tracking if we are painting inside a replica.
bool m_inOverflowRelayout : 1;
bool m_needsFullRepaint : 1;
bool m_overflowStatusDirty : 1;
bool m_horizontalOverflow : 1;
bool m_verticalOverflow : 1;
bool m_visibleContentStatusDirty : 1;
bool m_hasVisibleContent : 1;
bool m_visibleDescendantStatusDirty : 1;
bool m_hasVisibleDescendant : 1;
bool m_isPaginated : 1; // If we think this layer is split by a multi-column ancestor, then this bit will be set.
bool m_3DTransformedDescendantStatusDirty : 1;
bool m_has3DTransformedDescendant : 1; // Set on a stacking context layer that has 3D descendants anywhere
// in a preserves3D hierarchy. Hint to do 3D-aware hit testing.
#if USE(ACCELERATED_COMPOSITING)
bool m_hasCompositingDescendant : 1;
bool m_mustOverlapCompositedLayers : 1;
#endif
RenderMarquee* m_marquee; // Used by layers with overflow:marquee
// Cached normal flow values for absolute positioned elements with static left/top values.
int m_staticX;
int m_staticY;
OwnPtr<TransformationMatrix> m_transform;
// May ultimately be extended to many replicas (with their own paint order).
RenderReplica* m_reflection;
// Renderers to hold our custom scroll corner and resizer.
RenderScrollbarPart* m_scrollCorner;
RenderScrollbarPart* m_resizer;
private:
IntRect m_blockSelectionGapsBounds;
#if USE(ACCELERATED_COMPOSITING)
OwnPtr<RenderLayerBacking> m_backing;
#endif
};
} // namespace WebCore
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showLayerTree(const WebCore::RenderLayer* layer);
#endif
#endif // RenderLayer_h
|