WebCore/page/FrameView.cpp

   1 /*
   2  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
   3  *                     1999 Lars Knoll <knoll@kde.org>
   4  *                     1999 Antti Koivisto <koivisto@kde.org>
   5  *                     2000 Dirk Mueller <mueller@kde.org>
   6  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   7  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
   8  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
   9  * Copyright (C) 2009 Google Inc. All rights reserved.
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Library General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Library General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Library General Public License
  22  * along with this library; see the file COPYING.LIB.  If not, write to
  23  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24  * Boston, MA 02110-1301, USA.
  25  */
  26
  27 #include "config.h"
  28 #include "FrameView.h"
  29
  30 #include "AXObjectCache.h"
  31 #include "CSSStyleSelector.h"
  32 #include "CachedResourceLoader.h"
  33 #include "Chrome.h"
  34 #include "ChromeClient.h"
  35 #include "EventHandler.h"
  36 #include "FloatRect.h"
  37 #include "FocusController.h"
  38 #include "Frame.h"
  39 #include "FrameLoader.h"
  40 #include "FrameLoaderClient.h"
  41 #include "FrameTree.h"
  42 #include "GraphicsContext.h"
  43 #include "HTMLDocument.h"
  44 #include "HTMLFrameElement.h"
  45 #include "HTMLFrameSetElement.h"
  46 #include "HTMLNames.h"
  47 #include "HTMLPlugInImageElement.h"
  48 #include "InspectorInstrumentation.h"
  49 #include "OverflowEvent.h"
  50 #include "RenderEmbeddedObject.h"
  51 #include "RenderLayer.h"
  52 #include "RenderPart.h"
  53 #include "RenderScrollbar.h"
  54 #include "RenderScrollbarPart.h"
  55 #include "RenderTheme.h"
  56 #include "RenderView.h"
  57 #include "Settings.h"
  58 #include "TextResourceDecoder.h"
  59 #include <wtf/CurrentTime.h>
  60
  61 #ifdef ANDROID_INSTRUMENT
  62 #include "FrameTree.h"
  63 #include "TimeCounter.h"
  64 #endif
  65
  66 #if USE(ACCELERATED_COMPOSITING)
  67 #include "RenderLayerCompositor.h"
  68 #endif
  69
  70 #if ENABLE(SVG)
  71 #include "SVGDocument.h"
  72 #include "SVGLocatable.h"
  73 #include "SVGNames.h"
  74 #include "SVGPreserveAspectRatio.h"
  75 #include "SVGSVGElement.h"
  76 #include "SVGViewElement.h"
  77 #include "SVGViewSpec.h"
  78 #endif
  79
  80 #if ENABLE(TILED_BACKING_STORE)
  81 #include "TiledBackingStore.h"
  82 #endif
  83
  84 #if PLATFORM(ANDROID)
  85 #include "WebCoreFrameBridge.h"
  86 #endif
  87
  88 namespace WebCore {
  89
  90 using namespace HTMLNames;
  91
  92 double FrameView::sCurrentPaintTimeStamp = 0.0;
  93
  94 // REPAINT_THROTTLING now chooses default values for throttling parameters.
  95 // Should be removed when applications start using runtime configuration.
  96 #if ENABLE(REPAINT_THROTTLING)
  97 // Normal delay
  98 double FrameView::s_deferredRepaintDelay = 0.025;
  99 // Negative value would mean that first few repaints happen without a delay
 100 double FrameView::s_initialDeferredRepaintDelayDuringLoading = 0;
 101 // The delay grows on each repaint to this maximum value
 102 double FrameView::s_maxDeferredRepaintDelayDuringLoading = 2.5;
 103 // On each repaint the delay increses by this amount
 104 double FrameView::s_deferredRepaintDelayIncrementDuringLoading = 0.5;
 105 #else
 106 // FIXME: Repaint throttling could be good to have on all platform.
 107 // The balance between CPU use and repaint frequency will need some tuning for desktop.
 108 // More hooks may be needed to reset the delay on things like GIF and CSS animations.
 109 double FrameView::s_deferredRepaintDelay = 0;
 110 double FrameView::s_initialDeferredRepaintDelayDuringLoading = 0;
 111 double FrameView::s_maxDeferredRepaintDelayDuringLoading = 0;
 112 double FrameView::s_deferredRepaintDelayIncrementDuringLoading = 0;
 113 #endif
 114
 115 // The maximum number of updateWidgets iterations that should be done before returning.
 116 static const unsigned maxUpdateWidgetsIterations = 2;
 117
 118 struct ScheduledEvent : Noncopyable {
 119     RefPtr<Event> m_event;
 120     RefPtr<Node> m_eventTarget;
 121 };
 122
 123 FrameView::FrameView(Frame* frame)
 124     : m_frame(frame)
 125     , m_canHaveScrollbars(true)
 126     , m_slowRepaintObjectCount(0)
 127     , m_fixedObjectCount(0)
 128     , m_layoutTimer(this, &FrameView::layoutTimerFired)
 129     , m_layoutRoot(0)
 130     , m_hasPendingPostLayoutTasks(false)
 131     , m_inSynchronousPostLayout(false)
 132     , m_postLayoutTasksTimer(this, &FrameView::postLayoutTimerFired)
 133     , m_isTransparent(false)
 134     , m_baseBackgroundColor(Color::white)
 135     , m_mediaType("screen")
 136     , m_enqueueEvents(0)
 137     , m_overflowStatusDirty(true)
 138     , m_viewportRenderer(0)
 139     , m_wasScrolledByUser(false)
 140     , m_inProgrammaticScroll(false)
 141     , m_deferredRepaintTimer(this, &FrameView::deferredRepaintTimerFired)
 142     , m_shouldUpdateWhileOffscreen(true)
 143     , m_deferSetNeedsLayouts(0)
 144     , m_setNeedsLayoutWasDeferred(false)
 145     , m_scrollCorner(0)
 146 {
 147     init();
 148 }
 149
 150 PassRefPtr<FrameView> FrameView::create(Frame* frame)
 151 {
 152     RefPtr<FrameView> view = adoptRef(new FrameView(frame));
 153     view->show();
 154     return view.release();
 155 }
 156
 157 PassRefPtr<FrameView> FrameView::create(Frame* frame, const IntSize& initialSize)
 158 {
 159     RefPtr<FrameView> view = adoptRef(new FrameView(frame));
 160     view->Widget::setFrameRect(IntRect(view->pos(), initialSize));
 161     view->show();
 162     return view.release();
 163 }
 164
 165 FrameView::~FrameView()
 166 {
 167     if (m_hasPendingPostLayoutTasks) {
 168         m_postLayoutTasksTimer.stop();
 169         m_scheduledEvents.clear();
 170         m_enqueueEvents = 0;
 171     }
 172
 173     resetScrollbars();
 174
 175     // Custom scrollbars should already be destroyed at this point
 176     ASSERT(!horizontalScrollbar() || !horizontalScrollbar()->isCustomScrollbar());
 177     ASSERT(!verticalScrollbar() || !verticalScrollbar()->isCustomScrollbar());
 178
 179     setHasHorizontalScrollbar(false); // Remove native scrollbars now before we lose the connection to the HostWindow.
 180     setHasVerticalScrollbar(false);
 181
 182     ASSERT(!m_scrollCorner);
 183     ASSERT(m_scheduledEvents.isEmpty());
 184     ASSERT(!m_enqueueEvents);
 185
 186     if (m_frame) {
 187         ASSERT(m_frame->view() != this || !m_frame->contentRenderer());
 188         RenderPart* renderer = m_frame->ownerRenderer();
 189         if (renderer && renderer->widget() == this)
 190             renderer->setWidget(0);
 191     }
 192 }
 193
 194 void FrameView::reset()
 195 {
 196     m_useSlowRepaints = false;
 197     m_isOverlapped = false;
 198     m_contentIsOpaque = false;
 199     m_borderX = 30;
 200     m_borderY = 30;
 201     m_layoutTimer.stop();
 202     m_layoutRoot = 0;
 203     m_delayedLayout = false;
 204     m_doFullRepaint = true;
 205     m_layoutSchedulingEnabled = true;
 206     m_inLayout = false;
 207     m_inSynchronousPostLayout = false;
 208     m_hasPendingPostLayoutTasks = false;
 209     m_layoutCount = 0;
 210     m_nestedLayoutCount = 0;
 211     m_postLayoutTasksTimer.stop();
 212     m_firstLayout = true;
 213     m_firstLayoutCallbackPending = false;
 214     m_wasScrolledByUser = false;
 215     m_lastLayoutSize = IntSize();
 216     m_lastZoomFactor = 1.0f;
 217     m_deferringRepaints = 0;
 218     m_repaintCount = 0;
 219     m_repaintRects.clear();
 220     m_deferredRepaintDelay = s_initialDeferredRepaintDelayDuringLoading;
 221     m_deferredRepaintTimer.stop();
 222     m_lastPaintTime = 0;
 223     m_paintBehavior = PaintBehaviorNormal;
 224     m_isPainting = false;
 225     m_isVisuallyNonEmpty = false;
 226     m_firstVisuallyNonEmptyLayoutCallbackPending = true;
 227     m_maintainScrollPositionAnchor = 0;
 228 }
 229
 230 bool FrameView::isFrameView() const
 231 {
 232     return true;
 233 }
 234
 235 void FrameView::clearFrame()
 236 {
 237     m_frame = 0;
 238 }
 239
 240 void FrameView::resetScrollbars()
 241 {
 242     // Reset the document's scrollbars back to our defaults before we yield the floor.
 243     m_firstLayout = true;
 244     setScrollbarsSuppressed(true);
 245     if (m_canHaveScrollbars)
 246         setScrollbarModes(ScrollbarAuto, ScrollbarAuto);
 247     else
 248         setScrollbarModes(ScrollbarAlwaysOff, ScrollbarAlwaysOff);
 249     setScrollbarsSuppressed(false);
 250 }
 251
 252 void FrameView::init()
 253 {
 254     reset();
 255
 256     m_margins = IntSize(-1, -1); // undefined
 257     m_size = IntSize();
 258
 259     // Propagate the marginwidth/height and scrolling modes to the view.
 260     Element* ownerElement = m_frame && m_frame->document() ? m_frame->document()->ownerElement() : 0;
 261     if (ownerElement && (ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(iframeTag))) {
 262         HTMLFrameElement* frameElt = static_cast<HTMLFrameElement*>(ownerElement);
 263         if (frameElt->scrollingMode() == ScrollbarAlwaysOff)
 264             setCanHaveScrollbars(false);
 265         int marginWidth = frameElt->getMarginWidth();
 266         int marginHeight = frameElt->getMarginHeight();
 267         if (marginWidth != -1)
 268             setMarginWidth(marginWidth);
 269         if (marginHeight != -1)
 270             setMarginHeight(marginHeight);
 271     }
 272 }
 273
 274 void FrameView::detachCustomScrollbars()
 275 {
 276     if (!m_frame)
 277         return;
 278
 279     Scrollbar* horizontalBar = horizontalScrollbar();
 280     if (horizontalBar && horizontalBar->isCustomScrollbar())
 281         setHasHorizontalScrollbar(false);
 282
 283     Scrollbar* verticalBar = verticalScrollbar();
 284     if (verticalBar && verticalBar->isCustomScrollbar())
 285         setHasVerticalScrollbar(false);
 286
 287     if (m_scrollCorner) {
 288         m_scrollCorner->destroy();
 289         m_scrollCorner = 0;
 290     }
 291 }
 292
 293 void FrameView::clear()
 294 {
 295     setCanBlitOnScroll(true);
 296
 297     reset();
 298
 299     if (m_frame) {
 300         if (RenderPart* renderer = m_frame->ownerRenderer())
 301             renderer->viewCleared();
 302     }
 303
 304     setScrollbarsSuppressed(true);
 305 }
 306
 307 bool FrameView::didFirstLayout() const
 308 {
 309     return !m_firstLayout;
 310 }
 311
 312 void FrameView::invalidateRect(const IntRect& rect)
 313 {
 314     if (!parent()) {
 315         if (hostWindow())
 316             hostWindow()->invalidateContentsAndWindow(rect, false /*immediate*/);
 317         return;
 318     }
 319
 320     if (!m_frame)
 321         return;
 322
 323     RenderPart* renderer = m_frame->ownerRenderer();
 324     if (!renderer)
 325         return;
 326
 327     IntRect repaintRect = rect;
 328     repaintRect.move(renderer->borderLeft() + renderer->paddingLeft(),
 329                      renderer->borderTop() + renderer->paddingTop());
 330     renderer->repaintRectangle(repaintRect);
 331 }
 332
 333 void FrameView::setFrameRect(const IntRect& newRect)
 334 {
 335     IntRect oldRect = frameRect();
 336     if (newRect == oldRect)
 337         return;
 338
 339     ScrollView::setFrameRect(newRect);
 340
 341 #if USE(ACCELERATED_COMPOSITING)
 342     if (RenderView* root = m_frame->contentRenderer()) {
 343         if (root->usesCompositing())
 344             root->compositor()->frameViewDidChangeSize();
 345     }
 346 #endif
 347 }
 348
 349 void FrameView::setMarginWidth(int w)
 350 {
 351     // make it update the rendering area when set
 352     m_margins.setWidth(w);
 353 }
 354
 355 void FrameView::setMarginHeight(int h)
 356 {
 357     // make it update the rendering area when set
 358     m_margins.setHeight(h);
 359 }
 360
 361 bool FrameView::avoidScrollbarCreation()
 362 {
 363     ASSERT(m_frame);
 364
 365     // with frame flattening no subframe can have scrollbars
 366     // but we also cannot turn scrollbars of as we determine
 367     // our flattening policy using that.
 368
 369     if (!m_frame->ownerElement())
 370         return false;
 371
 372     if (!m_frame->settings() || m_frame->settings()->frameFlatteningEnabled())
 373         return true;
 374
 375     return false;
 376 }
 377
 378 void FrameView::setCanHaveScrollbars(bool canHaveScrollbars)
 379 {
 380     m_canHaveScrollbars = canHaveScrollbars;
 381     ScrollView::setCanHaveScrollbars(canHaveScrollbars);
 382 }
 383
 384 void FrameView::updateCanHaveScrollbars()
 385 {
 386     ScrollbarMode hMode;
 387     ScrollbarMode vMode;
 388     scrollbarModes(hMode, vMode);
 389     if (hMode == ScrollbarAlwaysOff && vMode == ScrollbarAlwaysOff)
 390         setCanHaveScrollbars(false);
 391     else
 392         setCanHaveScrollbars(true);
 393 }
 394
 395 PassRefPtr<Scrollbar> FrameView::createScrollbar(ScrollbarOrientation orientation)
 396 {
 397     // FIXME: We need to update the scrollbar dynamically as documents change (or as doc elements and bodies get discovered that have custom styles).
 398     Document* doc = m_frame->document();
 399
 400     // Try the <body> element first as a scrollbar source.
 401     Element* body = doc ? doc->body() : 0;
 402     if (body && body->renderer() && body->renderer()->style()->hasPseudoStyle(SCROLLBAR))
 403         return RenderScrollbar::createCustomScrollbar(this, orientation, body->renderer()->enclosingBox());
 404
 405     // If the <body> didn't have a custom style, then the root element might.
 406     Element* docElement = doc ? doc->documentElement() : 0;
 407     if (docElement && docElement->renderer() && docElement->renderer()->style()->hasPseudoStyle(SCROLLBAR))
 408         return RenderScrollbar::createCustomScrollbar(this, orientation, docElement->renderBox());
 409
 410     // If we have an owning iframe/frame element, then it can set the custom scrollbar also.
 411     RenderPart* frameRenderer = m_frame->ownerRenderer();
 412     if (frameRenderer && frameRenderer->style()->hasPseudoStyle(SCROLLBAR))
 413         return RenderScrollbar::createCustomScrollbar(this, orientation, 0, m_frame.get());
 414
 415     // Nobody set a custom style, so we just use a native scrollbar.
 416     return ScrollView::createScrollbar(orientation);
 417 }
 418
 419 void FrameView::setContentsSize(const IntSize& size)
 420 {
 421     if (size == contentsSize())
 422         return;
 423
 424     m_deferSetNeedsLayouts++;
 425
 426     ScrollView::setContentsSize(size);
 427
 428     Page* page = frame() ? frame()->page() : 0;
 429     if (!page)
 430         return;
 431
 432     page->chrome()->contentsSizeChanged(frame(), size); //notify only
 433
 434     m_deferSetNeedsLayouts--;
 435
 436     if (!m_deferSetNeedsLayouts)
 437         m_setNeedsLayoutWasDeferred = false; // FIXME: Find a way to make the deferred layout actually happen.
 438 }
 439
 440 void FrameView::adjustViewSize()
 441 {
 442     ASSERT(m_frame->view() == this);
 443     RenderView* root = m_frame->contentRenderer();
 444     if (!root)
 445         return;
 446
 447     setContentsSize(IntSize(root->rightLayoutOverflow(), root->bottomLayoutOverflow()));
 448 }
 449
 450 void FrameView::applyOverflowToViewport(RenderObject* o, ScrollbarMode& hMode, ScrollbarMode& vMode)
 451 {
 452     // Handle the overflow:hidden/scroll case for the body/html elements.  WinIE treats
 453     // overflow:hidden and overflow:scroll on <body> as applying to the document's
 454     // scrollbars.  The CSS2.1 draft states that HTML UAs should use the <html> or <body> element and XML/XHTML UAs should
 455     // use the root element.
 456     switch (o->style()->overflowX()) {
 457         case OHIDDEN:
 458             hMode = ScrollbarAlwaysOff;
 459             break;
 460         case OSCROLL:
 461             hMode = ScrollbarAlwaysOn;
 462             break;
 463         case OAUTO:
 464             hMode = ScrollbarAuto;
 465             break;
 466         default:
 467             // Don't set it at all.
 468             ;
 469     }
 470
 471      switch (o->style()->overflowY()) {
 472         case OHIDDEN:
 473             vMode = ScrollbarAlwaysOff;
 474             break;
 475         case OSCROLL:
 476             vMode = ScrollbarAlwaysOn;
 477             break;
 478         case OAUTO:
 479             vMode = ScrollbarAuto;
 480             break;
 481         default:
 482             // Don't set it at all.
 483             ;
 484     }
 485
 486     m_viewportRenderer = o;
 487 }
 488
 489 void FrameView::calculateScrollbarModesForLayout(ScrollbarMode& hMode, ScrollbarMode& vMode)
 490 {
 491     if (m_canHaveScrollbars) {
 492         hMode = ScrollbarAuto;
 493         vMode = ScrollbarAuto;
 494     } else {
 495         hMode = ScrollbarAlwaysOff;
 496         vMode = ScrollbarAlwaysOff;
 497     }
 498
 499     if (!m_layoutRoot) {
 500         Document* document = m_frame->document();
 501         Node* documentElement = document->documentElement();
 502         RenderObject* rootRenderer = documentElement ? documentElement->renderer() : 0;
 503         Node* body = document->body();
 504         if (body && body->renderer()) {
 505             if (body->hasTagName(framesetTag) && m_frame->settings() && !m_frame->settings()->frameFlatteningEnabled()) {
 506 #if !defined(ANDROID_FLATTEN_IFRAME) && !defined(ANDROID_FLATTEN_FRAMESET)
 507                 body->renderer()->setChildNeedsLayout(true);
 508                 vMode = ScrollbarAlwaysOff;
 509                 hMode = ScrollbarAlwaysOff;
 510 #endif
 511             } else if (body->hasTagName(bodyTag)) {
 512                 if (!m_firstLayout && m_size.height() != layoutHeight() && body->renderer()->enclosingBox()->stretchesToViewport())
 513                     body->renderer()->setChildNeedsLayout(true);
 514                 // It's sufficient to just check the X overflow,
 515                 // since it's illegal to have visible in only one direction.
 516                 RenderObject* o = rootRenderer->style()->overflowX() == OVISIBLE && document->documentElement()->hasTagName(htmlTag) ? body->renderer() : rootRenderer;
 517                 applyOverflowToViewport(o, hMode, vMode);
 518             }
 519         } else if (rootRenderer) {
 520 #if ENABLE(SVG)
 521             if (documentElement->isSVGElement()) {
 522                 if (!m_firstLayout && (m_size.width() != layoutWidth() || m_size.height() != layoutHeight()))
 523                     rootRenderer->setChildNeedsLayout(true);
 524             } else
 525                 applyOverflowToViewport(rootRenderer, hMode, vMode);
 526 #else
 527             applyOverflowToViewport(rootRenderer, hMode, vMode);
 528 #endif
 529         }
 530 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
 531         if (m_firstLayout && !document->ownerElement())
 532             printf("Elapsed time before first layout: %d\n", document->elapsedTime());
 533 #endif
 534     }
 535
 536     HTMLFrameOwnerElement* owner = m_frame->ownerElement();
 537     if (owner && (owner->scrollingMode() == ScrollbarAlwaysOff)) {
 538         hMode = ScrollbarAlwaysOff;
 539         vMode = ScrollbarAlwaysOff;
 540     }
 541 }
 542
 543 #if USE(ACCELERATED_COMPOSITING)
 544 void FrameView::updateCompositingLayers()
 545 {
 546     RenderView* view = m_frame->contentRenderer();
 547     if (!view)
 548         return;
 549
 550     // This call will make sure the cached hasAcceleratedCompositing is updated from the pref
 551     view->compositor()->cacheAcceleratedCompositingFlags();
 552     view->compositor()->updateCompositingLayers(CompositingUpdateAfterLayoutOrStyleChange);
 553 }
 554
 555 void FrameView::setNeedsOneShotDrawingSynchronization()
 556 {
 557     Page* page = frame() ? frame()->page() : 0;
 558     if (page)
 559         page->chrome()->client()->setNeedsOneShotDrawingSynchronization();
 560 }
 561
 562 #endif // USE(ACCELERATED_COMPOSITING)
 563
 564 bool FrameView::hasCompositedContent() const
 565 {
 566 #if USE(ACCELERATED_COMPOSITING)
 567     if (RenderView* view = m_frame->contentRenderer())
 568         return view->compositor()->inCompositingMode();
 569 #endif
 570     return false;
 571 }
 572
 573 // Sometimes (for plug-ins) we need to eagerly go into compositing mode.
 574 void FrameView::enterCompositingMode()
 575 {
 576 #if USE(ACCELERATED_COMPOSITING)
 577     if (RenderView* view = m_frame->contentRenderer()) {
 578         view->compositor()->enableCompositingMode();
 579         if (!needsLayout())
 580             view->compositor()->scheduleCompositingLayerUpdate();
 581     }
 582 #endif
 583 }
 584
 585 bool FrameView::isEnclosedInCompositingLayer() const
 586 {
 587 #if USE(ACCELERATED_COMPOSITING)
 588     RenderObject* frameOwnerRenderer = m_frame->ownerRenderer();
 589     return frameOwnerRenderer && frameOwnerRenderer->containerForRepaint();
 590 #else
 591     return false;
 592 #endif
 593 }
 594
 595 bool FrameView::syncCompositingStateRecursive()
 596 {
 597 #if USE(ACCELERATED_COMPOSITING)
 598     ASSERT(m_frame->view() == this);
 599     RenderView* contentRenderer = m_frame->contentRenderer();
 600     if (!contentRenderer)
 601         return true;    // We don't want to keep trying to update layers if we have no renderer.
 602
 603     // If we sync compositing layers when a layout is pending, we may cause painting of compositing
 604     // layer content to occur before layout has happened, which will cause paintContents() to bail.
 605     if (needsLayout())
 606         return false;
 607
 608     if (GraphicsLayer* rootLayer = contentRenderer->compositor()->rootPlatformLayer())
 609         rootLayer->syncCompositingState();
 610
 611     bool allSubframesSynced = true;
 612     const HashSet<RefPtr<Widget> >* viewChildren = children();
 613     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
 614     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
 615         Widget* widget = (*current).get();
 616         if (widget->isFrameView()) {
 617             bool synced = static_cast<FrameView*>(widget)->syncCompositingStateRecursive();
 618             allSubframesSynced &= synced;
 619         }
 620     }
 621     return allSubframesSynced;
 622 #else // USE(ACCELERATED_COMPOSITING)
 623     return true;
 624 #endif
 625 }
 626
 627 bool FrameView::isSoftwareRenderable() const
 628 {
 629 #if USE(ACCELERATED_COMPOSITING)
 630     RenderView* view = m_frame->contentRenderer();
 631     if (!view)
 632         return true;
 633
 634     return !view->compositor()->has3DContent();
 635 #else
 636     return true;
 637 #endif
 638 }
 639
 640 void FrameView::didMoveOnscreen()
 641 {
 642     RenderView* view = m_frame->contentRenderer();
 643     if (view)
 644         view->didMoveOnscreen();
 645 }
 646
 647 void FrameView::willMoveOffscreen()
 648 {
 649     RenderView* view = m_frame->contentRenderer();
 650     if (view)
 651         view->willMoveOffscreen();
 652 }
 653
 654 RenderObject* FrameView::layoutRoot(bool onlyDuringLayout) const
 655 {
 656     return onlyDuringLayout && layoutPending() ? 0 : m_layoutRoot;
 657 }
 658
 659 void FrameView::layout(bool allowSubtree)
 660 {
 661     if (m_inLayout)
 662         return;
 663
 664     m_layoutTimer.stop();
 665     m_delayedLayout = false;
 666     m_setNeedsLayoutWasDeferred = false;
 667
 668     // Protect the view from being deleted during layout (in recalcStyle)
 669     RefPtr<FrameView> protector(this);
 670
 671     if (!m_frame) {
 672         // FIXME: Do we need to set m_size.width here?
 673         // FIXME: Should we set m_size.height here too?
 674         m_size.setWidth(layoutWidth());
 675         return;
 676     }
 677
 678     // we shouldn't enter layout() while painting
 679     ASSERT(!isPainting());
 680     if (isPainting())
 681         return;
 682
 683     InspectorInstrumentationCookie cookie = InspectorInstrumentation::willLayout(m_frame.get());
 684
 685     if (!allowSubtree && m_layoutRoot) {
 686         m_layoutRoot->markContainingBlocksForLayout(false);
 687         m_layoutRoot = 0;
 688     }
 689
 690     ASSERT(m_frame->view() == this);
 691
 692     Document* document = m_frame->document();
 693
 694     m_layoutSchedulingEnabled = false;
 695
 696     if (!m_nestedLayoutCount && !m_inSynchronousPostLayout && m_hasPendingPostLayoutTasks) {
 697         // This is a new top-level layout. If there are any remaining tasks from the previous
 698         // layout, finish them now.
 699         m_inSynchronousPostLayout = true;
 700         m_postLayoutTasksTimer.stop();
 701         performPostLayoutTasks();
 702         m_inSynchronousPostLayout = false;
 703     }
 704
 705     // Viewport-dependent media queries may cause us to need completely different style information.
 706     // Check that here.
 707     if (document->styleSelector()->affectedByViewportChange())
 708         document->styleSelectorChanged(RecalcStyleImmediately);
 709
 710     // Always ensure our style info is up-to-date.  This can happen in situations where
 711     // the layout beats any sort of style recalc update that needs to occur.
 712     document->updateStyleIfNeeded();
 713
 714     bool subtree = m_layoutRoot;
 715
 716     // If there is only one ref to this view left, then its going to be destroyed as soon as we exit,
 717     // so there's no point to continuing to layout
 718     if (protector->hasOneRef())
 719         return;
 720
 721     RenderObject* root = subtree ? m_layoutRoot : document->renderer();
 722     if (!root) {
 723         // FIXME: Do we need to set m_size here?
 724         m_layoutSchedulingEnabled = true;
 725         return;
 726     }
 727
 728 #ifdef ANDROID_INSTRUMENT
 729     if (!m_frame->tree() || !m_frame->tree()->parent())
 730         android::TimeCounter::start(android::TimeCounter::LayoutTimeCounter);
 731 #endif
 732
 733     m_nestedLayoutCount++;
 734
 735     ScrollbarMode hMode;
 736     ScrollbarMode vMode;
 737
 738     calculateScrollbarModesForLayout(hMode, vMode);
 739
 740     m_doFullRepaint = !subtree && (m_firstLayout || toRenderView(root)->printing());
 741
 742     if (!subtree) {
 743         // Now set our scrollbar state for the layout.
 744         ScrollbarMode currentHMode = horizontalScrollbarMode();
 745         ScrollbarMode currentVMode = verticalScrollbarMode();
 746
 747         if (m_firstLayout || (hMode != currentHMode || vMode != currentVMode)) {
 748             if (m_firstLayout) {
 749                 setScrollbarsSuppressed(true);
 750
 751                 m_firstLayout = false;
 752                 m_firstLayoutCallbackPending = true;
 753                 m_lastLayoutSize = IntSize(width(), height());
 754                 m_lastZoomFactor = root->style()->zoom();
 755
 756                 // Set the initial vMode to AlwaysOn if we're auto.
 757                 if (vMode == ScrollbarAuto)
 758                     setVerticalScrollbarMode(ScrollbarAlwaysOn); // This causes a vertical scrollbar to appear.
 759                 // Set the initial hMode to AlwaysOff if we're auto.
 760                 if (hMode == ScrollbarAuto)
 761                     setHorizontalScrollbarMode(ScrollbarAlwaysOff); // This causes a horizontal scrollbar to disappear.
 762
 763                 setScrollbarModes(hMode, vMode);
 764                 setScrollbarsSuppressed(false, true);
 765             } else
 766                 setScrollbarModes(hMode, vMode);
 767         }
 768
 769         IntSize oldSize = m_size;
 770
 771         m_size = IntSize(layoutWidth(), layoutHeight());
 772
 773         if (oldSize != m_size)
 774             m_doFullRepaint = true;
 775     }
 776
 777     RenderLayer* layer = root->enclosingLayer();
 778
 779     pauseScheduledEvents();
 780
 781     bool disableLayoutState = false;
 782     if (subtree) {
 783         RenderView* view = root->view();
 784         disableLayoutState = view->shouldDisableLayoutStateForSubtree(root);
 785         view->pushLayoutState(root);
 786         if (disableLayoutState)
 787             view->disableLayoutState();
 788     }
 789
 790     m_inLayout = true;
 791     beginDeferredRepaints();
 792     root->layout();
 793     endDeferredRepaints();
 794     m_inLayout = false;
 795
 796     if (subtree) {
 797         RenderView* view = root->view();
 798         view->popLayoutState(root);
 799         if (disableLayoutState)
 800             view->enableLayoutState();
 801     }
 802     m_layoutRoot = 0;
 803
 804     m_frame->selection()->setCaretRectNeedsUpdate();
 805     m_frame->selection()->updateAppearance();
 806
 807     m_layoutSchedulingEnabled = true;
 808
 809     if (!subtree && !toRenderView(root)->printing())
 810         adjustViewSize();
 811
 812     // Now update the positions of all layers.
 813     beginDeferredRepaints();
 814     IntPoint cachedOffset;
 815     layer->updateLayerPositions((m_doFullRepaint ? RenderLayer::DoFullRepaint : 0)
 816                                 | RenderLayer::CheckForRepaint
 817                                 | RenderLayer::IsCompositingUpdateRoot
 818                                 | RenderLayer::UpdateCompositingLayers,
 819                                 subtree ? 0 : &cachedOffset);
 820     endDeferredRepaints();
 821
 822 #if USE(ACCELERATED_COMPOSITING)
 823     updateCompositingLayers();
 824 #endif
 825
 826     m_layoutCount++;
 827
 828 #if PLATFORM(MAC) || PLATFORM(CHROMIUM)
 829     if (AXObjectCache::accessibilityEnabled())
 830         root->document()->axObjectCache()->postNotification(root, AXObjectCache::AXLayoutComplete, true);
 831 #endif
 832 #if ENABLE(DASHBOARD_SUPPORT)
 833     updateDashboardRegions();
 834 #endif
 835
 836 #ifdef ANDROID_INSTRUMENT
 837     if (!m_frame->tree()->parent())
 838         android::TimeCounter::record(android::TimeCounter::LayoutTimeCounter, __FUNCTION__);
 839 #endif
 840     ASSERT(!root->needsLayout());
 841
 842     setCanBlitOnScroll(!useSlowRepaints());
 843
 844     if (document->hasListenerType(Document::OVERFLOWCHANGED_LISTENER))
 845         updateOverflowStatus(layoutWidth() < contentsWidth(),
 846                              layoutHeight() < contentsHeight());
 847
 848     if (!m_hasPendingPostLayoutTasks) {
 849         if (!m_inSynchronousPostLayout) {
 850             m_inSynchronousPostLayout = true;
 851             // Calls resumeScheduledEvents()
 852             performPostLayoutTasks();
 853             m_inSynchronousPostLayout = false;
 854         }
 855
 856         if (!m_hasPendingPostLayoutTasks && (needsLayout() || m_inSynchronousPostLayout)) {
 857             // If we need layout or are already in a synchronous call to postLayoutTasks(),
 858             // defer widget updates and event dispatch until after we return. postLayoutTasks()
 859             // can make us need to update again, and we can get stuck in a nasty cycle unless
 860             // we call it through the timer here.
 861             m_hasPendingPostLayoutTasks = true;
 862             m_postLayoutTasksTimer.startOneShot(0);
 863             if (needsLayout()) {
 864                 pauseScheduledEvents();
 865                 layout();
 866             }
 867         }
 868     } else {
 869         resumeScheduledEvents();
 870         ASSERT(m_enqueueEvents);
 871     }
 872
 873     InspectorInstrumentation::didLayout(cookie);
 874
 875     m_nestedLayoutCount--;
 876 }
 877
 878 void FrameView::addWidgetToUpdate(RenderEmbeddedObject* object)
 879 {
 880     if (!m_widgetUpdateSet)
 881         m_widgetUpdateSet.set(new RenderEmbeddedObjectSet);
 882
 883     m_widgetUpdateSet->add(object);
 884 }
 885
 886 void FrameView::removeWidgetToUpdate(RenderEmbeddedObject* object)
 887 {
 888     if (!m_widgetUpdateSet)
 889         return;
 890
 891     m_widgetUpdateSet->remove(object);
 892 }
 893
 894 void FrameView::setMediaType(const String& mediaType)
 895 {
 896     m_mediaType = mediaType;
 897 }
 898
 899 String FrameView::mediaType() const
 900 {
 901     // See if we have an override type.
 902     String overrideType = m_frame->loader()->client()->overrideMediaType();
 903     if (!overrideType.isNull())
 904         return overrideType;
 905     return m_mediaType;
 906 }
 907
 908 void FrameView::adjustMediaTypeForPrinting(bool printing)
 909 {
 910     if (printing) {
 911         if (m_mediaTypeWhenNotPrinting.isNull())
 912             m_mediaTypeWhenNotPrinting = mediaType();
 913             setMediaType("print");
 914     } else {
 915         if (!m_mediaTypeWhenNotPrinting.isNull())
 916             setMediaType(m_mediaTypeWhenNotPrinting);
 917         m_mediaTypeWhenNotPrinting = String();
 918     }
 919 }
 920
 921 bool FrameView::useSlowRepaints() const
 922 {
 923     return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || (platformWidget() && m_fixedObjectCount > 0) || m_isOverlapped || !m_contentIsOpaque;
 924 }
 925
 926 bool FrameView::useSlowRepaintsIfNotOverlapped() const
 927 {
 928     return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || (platformWidget() && m_fixedObjectCount > 0) || !m_contentIsOpaque;
 929 }
 930
 931 void FrameView::setUseSlowRepaints()
 932 {
 933     m_useSlowRepaints = true;
 934     setCanBlitOnScroll(false);
 935 }
 936
 937 void FrameView::addSlowRepaintObject()
 938 {
 939     if (!m_slowRepaintObjectCount)
 940         setCanBlitOnScroll(false);
 941     m_slowRepaintObjectCount++;
 942 }
 943
 944 void FrameView::removeSlowRepaintObject()
 945 {
 946     ASSERT(m_slowRepaintObjectCount > 0);
 947     m_slowRepaintObjectCount--;
 948     if (!m_slowRepaintObjectCount)
 949         setCanBlitOnScroll(!useSlowRepaints());
 950 }
 951
 952 void FrameView::addFixedObject()
 953 {
 954     if (!m_fixedObjectCount && platformWidget())
 955         setCanBlitOnScroll(false);
 956     ++m_fixedObjectCount;
 957 }
 958
 959 void FrameView::removeFixedObject()
 960 {
 961     ASSERT(m_fixedObjectCount > 0);
 962     --m_fixedObjectCount;
 963     if (!m_fixedObjectCount)
 964         setCanBlitOnScroll(!useSlowRepaints());
 965 }
 966
 967 bool FrameView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
 968 {
 969     const size_t fixedObjectThreshold = 5;
 970
 971     RenderBlock::PositionedObjectsListHashSet* positionedObjects = 0;
 972     if (RenderView* root = m_frame->contentRenderer())
 973         positionedObjects = root->positionedObjects();
 974
 975     if (!positionedObjects || positionedObjects->isEmpty()) {
 976         hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
 977         return true;
 978     }
 979
 980     // Get the rects of the fixed objects visible in the rectToScroll
 981     Vector<IntRect, fixedObjectThreshold> subRectToUpdate;
 982     bool updateInvalidatedSubRect = true;
 983     RenderBlock::PositionedObjectsListHashSet::const_iterator end = positionedObjects->end();
 984     for (RenderBlock::PositionedObjectsListHashSet::const_iterator it = positionedObjects->begin(); it != end; ++it) {
 985         RenderBox* renderBox = *it;
 986         if (renderBox->style()->position() != FixedPosition)
 987             continue;
 988         IntRect updateRect = renderBox->layer()->repaintRectIncludingDescendants();
 989         updateRect = contentsToWindow(updateRect);
 990
 991         updateRect.intersect(rectToScroll);
 992         if (!updateRect.isEmpty()) {
 993             if (subRectToUpdate.size() >= fixedObjectThreshold) {
 994                 updateInvalidatedSubRect = false;
 995                 break;
 996             }
 997             subRectToUpdate.append(updateRect);
 998         }
 999     }
1000
1001     // Scroll the view
1002     if (updateInvalidatedSubRect) {
1003         // 1) scroll
1004         hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
1005
1006         // 2) update the area of fixed objects that has been invalidated
1007         size_t fixObjectsCount = subRectToUpdate.size();
1008         for (size_t i = 0; i < fixObjectsCount; ++i) {
1009             IntRect updateRect = subRectToUpdate[i];
1010             IntRect scrolledRect = updateRect;
1011             scrolledRect.move(scrollDelta);
1012             updateRect.unite(scrolledRect);
1013             updateRect.intersect(rectToScroll);
1014             hostWindow()->invalidateContentsAndWindow(updateRect, false);
1015         }
1016         return true;
1017     }
1018
1019     // the number of fixed objects exceed the threshold, we cannot use the fast path
1020     return false;
1021 }
1022
1023 // Note that this gets called at painting time.
1024 void FrameView::setIsOverlapped(bool isOverlapped)
1025 {
1026     if (isOverlapped == m_isOverlapped)
1027         return;
1028
1029     m_isOverlapped = isOverlapped;
1030     setCanBlitOnScroll(!useSlowRepaints());
1031
1032 #if USE(ACCELERATED_COMPOSITING)
1033     // Overlap can affect compositing tests, so if it changes, we need to trigger
1034     // a layer update in the parent document.
1035     if (hasCompositedContent()) {
1036         if (Frame* parentFrame = m_frame->tree()->parent()) {
1037             if (RenderView* parentView = parentFrame->contentRenderer()) {
1038                 RenderLayerCompositor* compositor = parentView->compositor();
1039                 compositor->setCompositingLayersNeedRebuild();
1040                 compositor->scheduleCompositingLayerUpdate();
1041             }
1042         }
1043     }
1044 #endif
1045 }
1046
1047 void FrameView::setContentIsOpaque(bool contentIsOpaque)
1048 {
1049     if (contentIsOpaque == m_contentIsOpaque)
1050         return;
1051
1052     m_contentIsOpaque = contentIsOpaque;
1053     setCanBlitOnScroll(!useSlowRepaints());
1054 }
1055
1056 void FrameView::restoreScrollbar()
1057 {
1058     setScrollbarsSuppressed(false);
1059 }
1060
1061 bool FrameView::scrollToFragment(const KURL& url)
1062 {
1063     // If our URL has no ref, then we have no place we need to jump to.
1064     // OTOH If CSS target was set previously, we want to set it to 0, recalc
1065     // and possibly repaint because :target pseudo class may have been
1066     // set (see bug 11321).
1067     if (!url.hasFragmentIdentifier() && !m_frame->document()->cssTarget())
1068         return false;
1069
1070     String fragmentIdentifier = url.fragmentIdentifier();
1071     if (scrollToAnchor(fragmentIdentifier))
1072         return true;
1073
1074     // Try again after decoding the ref, based on the document's encoding.
1075     if (TextResourceDecoder* decoder = m_frame->document()->decoder())
1076         return scrollToAnchor(decodeURLEscapeSequences(fragmentIdentifier, decoder->encoding()));
1077
1078     return false;
1079 }
1080
1081 bool FrameView::scrollToAnchor(const String& name)
1082 {
1083     ASSERT(m_frame->document());
1084
1085     if (!m_frame->document()->haveStylesheetsLoaded()) {
1086         m_frame->document()->setGotoAnchorNeededAfterStylesheetsLoad(true);
1087         return false;
1088     }
1089
1090     m_frame->document()->setGotoAnchorNeededAfterStylesheetsLoad(false);
1091
1092     Element* anchorNode = m_frame->document()->findAnchor(name);
1093
1094 #if ENABLE(SVG)
1095     if (m_frame->document()->isSVGDocument()) {
1096         if (name.startsWith("xpointer(")) {
1097             // We need to parse the xpointer reference here
1098         } else if (name.startsWith("svgView(")) {
1099             RefPtr<SVGSVGElement> svg = static_cast<SVGDocument*>(m_frame->document())->rootElement();
1100             if (!svg->currentView()->parseViewSpec(name))
1101                 return false;
1102             svg->setUseCurrentView(true);
1103         } else {
1104             if (anchorNode && anchorNode->hasTagName(SVGNames::viewTag)) {
1105                 RefPtr<SVGViewElement> viewElement = anchorNode->hasTagName(SVGNames::viewTag) ? static_cast<SVGViewElement*>(anchorNode) : 0;
1106                 if (viewElement.get()) {
1107                     RefPtr<SVGSVGElement> svg = static_cast<SVGSVGElement*>(SVGLocatable::nearestViewportElement(viewElement.get()));
1108                     svg->inheritViewAttributes(viewElement.get());
1109                 }
1110             }
1111         }
1112         // FIXME: need to decide which <svg> to focus on, and zoom to that one
1113         // FIXME: need to actually "highlight" the viewTarget(s)
1114     }
1115 #endif
1116
1117     m_frame->document()->setCSSTarget(anchorNode); // Setting to null will clear the current target.
1118
1119     // Implement the rule that "" and "top" both mean top of page as in other browsers.
1120     if (!anchorNode && !(name.isEmpty() || equalIgnoringCase(name, "top")))
1121         return false;
1122
1123 #ifdef ANDROID_SCROLL_ON_GOTO_ANCHOR
1124     // TODO(andreip): check with Grace if this is correct.
1125     android::WebFrame::getWebFrame(m_frame.get())->setUserInitiatedAction(true);
1126 #endif
1127     maintainScrollPositionAtAnchor(anchorNode ? static_cast<Node*>(anchorNode) : m_frame->document());
1128 #ifdef ANDROID_SCROLL_ON_GOTO_ANCHOR
1129     android::WebFrame::getWebFrame(m_frame.get())->setUserInitiatedAction(false);
1130 #endif
1131     return true;
1132 }
1133
1134 void FrameView::maintainScrollPositionAtAnchor(Node* anchorNode)
1135 {
1136     m_maintainScrollPositionAnchor = anchorNode;
1137     if (!m_maintainScrollPositionAnchor)
1138         return;
1139
1140     // We need to update the layout before scrolling, otherwise we could
1141     // really mess things up if an anchor scroll comes at a bad moment.
1142     m_frame->document()->updateStyleIfNeeded();
1143     // Only do a layout if changes have occurred that make it necessary.
1144     if (m_frame->contentRenderer() && m_frame->contentRenderer()->needsLayout())
1145         layout();
1146     else
1147         scrollToAnchor();
1148 }
1149
1150 void FrameView::setScrollPosition(const IntPoint& scrollPoint)
1151 {
1152     bool wasInProgrammaticScroll = m_inProgrammaticScroll;
1153     m_inProgrammaticScroll = true;
1154     m_maintainScrollPositionAnchor = 0;
1155     ScrollView::setScrollPosition(scrollPoint);
1156     m_inProgrammaticScroll = wasInProgrammaticScroll;
1157 }
1158
1159 void FrameView::scrollPositionChangedViaPlatformWidget()
1160 {
1161     repaintFixedElementsAfterScrolling();
1162     scrollPositionChanged();
1163 }
1164
1165 void FrameView::scrollPositionChanged()
1166 {
1167     frame()->eventHandler()->sendScrollEvent();
1168
1169 #if USE(ACCELERATED_COMPOSITING)
1170     if (RenderView* root = m_frame->contentRenderer()) {
1171         if (root->usesCompositing())
1172             root->compositor()->frameViewDidScroll(scrollPosition());
1173     }
1174 #endif
1175 }
1176
1177 void FrameView::repaintFixedElementsAfterScrolling()
1178 {
1179     // For fixed position elements, update widget positions and compositing layers after scrolling,
1180     // but only if we're not inside of layout.
1181     if (!m_nestedLayoutCount && hasFixedObjects()) {
1182         if (RenderView* root = m_frame->contentRenderer()) {
1183             root->updateWidgetPositions();
1184             root->layer()->updateRepaintRectsAfterScroll();
1185 #if USE(ACCELERATED_COMPOSITING)
1186             root->compositor()->updateCompositingLayers(CompositingUpdateOnScroll);
1187 #endif
1188         }
1189     }
1190 }
1191
1192 HostWindow* FrameView::hostWindow() const
1193 {
1194     Page* page = frame() ? frame()->page() : 0;
1195     if (!page)
1196         return 0;
1197     return page->chrome();
1198 }
1199
1200 const unsigned cRepaintRectUnionThreshold = 25;
1201
1202 void FrameView::repaintContentRectangle(const IntRect& r, bool immediate)
1203 {
1204     ASSERT(!m_frame->document()->ownerElement());
1205
1206     double delay = adjustedDeferredRepaintDelay();
1207     if ((m_deferringRepaints || m_deferredRepaintTimer.isActive() || delay) && !immediate) {
1208         IntRect paintRect = r;
1209         if (!paintsEntireContents())
1210             paintRect.intersect(visibleContentRect());
1211 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
1212         if (r != paintRect)
1213             ScrollView::platformOffscreenContentRectangle(visibleContentRect(), r);
1214 #endif
1215         if (paintRect.isEmpty())
1216             return;
1217         if (m_repaintCount == cRepaintRectUnionThreshold) {
1218             IntRect unionedRect;
1219             for (unsigned i = 0; i < cRepaintRectUnionThreshold; ++i)
1220                 unionedRect.unite(m_repaintRects[i]);
1221             m_repaintRects.clear();
1222             m_repaintRects.append(unionedRect);
1223         }
1224         if (m_repaintCount < cRepaintRectUnionThreshold)
1225             m_repaintRects.append(paintRect);
1226         else
1227             m_repaintRects[0].unite(paintRect);
1228         m_repaintCount++;
1229
1230         if (!m_deferringRepaints && !m_deferredRepaintTimer.isActive())
1231              m_deferredRepaintTimer.startOneShot(delay);
1232         return;
1233     }
1234
1235     if (!immediate && isOffscreen() && !shouldUpdateWhileOffscreen())
1236         return;
1237
1238 #if ENABLE(TILED_BACKING_STORE)
1239     if (frame()->tiledBackingStore()) {
1240         frame()->tiledBackingStore()->invalidate(r);
1241         return;
1242     }
1243 #endif
1244     ScrollView::repaintContentRectangle(r, immediate);
1245 }
1246
1247 void FrameView::visibleContentsResized()
1248 {
1249     // We check to make sure the view is attached to a frame() as this method can
1250     // be triggered before the view is attached by Frame::createView(...) setting
1251     // various values such as setScrollBarModes(...) for example.  An ASSERT is
1252     // triggered when a view is layout before being attached to a frame().
1253     if (!frame()->view())
1254         return;
1255
1256     if (needsLayout())
1257         layout();
1258 }
1259
1260 void FrameView::beginDeferredRepaints()
1261 {
1262     Page* page = m_frame->page();
1263     if (page->mainFrame() != m_frame)
1264         return page->mainFrame()->view()->beginDeferredRepaints();
1265
1266     m_deferringRepaints++;
1267 }
1268
1269
1270 void FrameView::endDeferredRepaints()
1271 {
1272     Page* page = m_frame->page();
1273     if (page->mainFrame() != m_frame)
1274         return page->mainFrame()->view()->endDeferredRepaints();
1275
1276     ASSERT(m_deferringRepaints > 0);
1277
1278     if (--m_deferringRepaints)
1279         return;
1280
1281     if (m_deferredRepaintTimer.isActive())
1282         return;
1283
1284     if (double delay = adjustedDeferredRepaintDelay()) {
1285         m_deferredRepaintTimer.startOneShot(delay);
1286         return;
1287     }
1288
1289     doDeferredRepaints();
1290 }
1291
1292 void FrameView::checkStopDelayingDeferredRepaints()
1293 {
1294     if (!m_deferredRepaintTimer.isActive())
1295         return;
1296
1297     Document* document = m_frame->document();
1298     if (document && (document->parsing() || document->cachedResourceLoader()->requestCount()))
1299         return;
1300
1301     m_deferredRepaintTimer.stop();
1302
1303     doDeferredRepaints();
1304 }
1305
1306 void FrameView::doDeferredRepaints()
1307 {
1308     ASSERT(!m_deferringRepaints);
1309     if (isOffscreen() && !shouldUpdateWhileOffscreen()) {
1310         m_repaintRects.clear();
1311         m_repaintCount = 0;
1312         return;
1313     }
1314     unsigned size = m_repaintRects.size();
1315     for (unsigned i = 0; i < size; i++) {
1316 #if ENABLE(TILED_BACKING_STORE)
1317         if (frame()->tiledBackingStore()) {
1318             frame()->tiledBackingStore()->invalidate(m_repaintRects[i]);
1319             continue;
1320         }
1321 #endif
1322         ScrollView::repaintContentRectangle(m_repaintRects[i], false);
1323     }
1324     m_repaintRects.clear();
1325     m_repaintCount = 0;
1326
1327     updateDeferredRepaintDelay();
1328 }
1329
1330 void FrameView::updateDeferredRepaintDelay()
1331 {
1332     Document* document = m_frame->document();
1333     if (!document || (!document->parsing() && !document->cachedResourceLoader()->requestCount())) {
1334         m_deferredRepaintDelay = s_deferredRepaintDelay;
1335         return;
1336     }
1337     if (m_deferredRepaintDelay < s_maxDeferredRepaintDelayDuringLoading) {
1338         m_deferredRepaintDelay += s_deferredRepaintDelayIncrementDuringLoading;
1339         if (m_deferredRepaintDelay > s_maxDeferredRepaintDelayDuringLoading)
1340             m_deferredRepaintDelay = s_maxDeferredRepaintDelayDuringLoading;
1341     }
1342 }
1343
1344 void FrameView::resetDeferredRepaintDelay()
1345 {
1346     m_deferredRepaintDelay = 0;
1347     if (m_deferredRepaintTimer.isActive()) {
1348         m_deferredRepaintTimer.stop();
1349         if (!m_deferringRepaints)
1350             doDeferredRepaints();
1351     }
1352 }
1353
1354 double FrameView::adjustedDeferredRepaintDelay() const
1355 {
1356     if (!m_deferredRepaintDelay)
1357         return 0;
1358     double timeSinceLastPaint = currentTime() - m_lastPaintTime;
1359     return max(0., m_deferredRepaintDelay - timeSinceLastPaint);
1360 }
1361
1362 void FrameView::deferredRepaintTimerFired(Timer<FrameView>*)
1363 {
1364     doDeferredRepaints();
1365 }
1366
1367 void FrameView::layoutTimerFired(Timer<FrameView>*)
1368 {
1369 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1370     if (!m_frame->document()->ownerElement())
1371         printf("Layout timer fired at %d\n", m_frame->document()->elapsedTime());
1372 #endif
1373     layout();
1374 }
1375
1376 void FrameView::scheduleRelayout()
1377 {
1378     // FIXME: We should assert the page is not in the page cache, but that is causing
1379     // too many false assertions.  See <rdar://problem/7218118>.
1380     ASSERT(m_frame->view() == this);
1381
1382     if (m_layoutRoot) {
1383         m_layoutRoot->markContainingBlocksForLayout(false);
1384         m_layoutRoot = 0;
1385     }
1386     if (!m_layoutSchedulingEnabled)
1387         return;
1388     if (!needsLayout())
1389         return;
1390     if (!m_frame->document()->shouldScheduleLayout())
1391         return;
1392
1393 #if defined(ANDROID_FLATTEN_IFRAME) || defined(ANDROID_FLATTEN_FRAMESET)
1394     // This is the Android frame flattening code. The common code below is not
1395     // used as frameSetFlatteningEnabled() is false on Android.
1396     if (m_frame->ownerRenderer())
1397         m_frame->ownerRenderer()->setNeedsLayoutAndPrefWidthsRecalc();
1398 #endif
1399
1400     // When frame flattening is enabled, the contents of the frame affects layout of the parent frames.
1401     // Also invalidate parent frame starting from the owner element of this frame.
1402     if (m_frame->settings() && m_frame->settings()->frameFlatteningEnabled() && m_frame->ownerRenderer()) {
1403         if (m_frame->ownerElement()->hasTagName(iframeTag) || m_frame->ownerElement()->hasTagName(frameTag))
1404             m_frame->ownerRenderer()->setNeedsLayout(true, true);
1405     }
1406
1407     int delay = m_frame->document()->minimumLayoutDelay();
1408     if (m_layoutTimer.isActive() && m_delayedLayout && !delay)
1409         unscheduleRelayout();
1410     if (m_layoutTimer.isActive())
1411         return;
1412
1413     m_delayedLayout = delay != 0;
1414
1415 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1416     if (!m_frame->document()->ownerElement())
1417         printf("Scheduling layout for %d\n", delay);
1418 #endif
1419
1420     m_layoutTimer.startOneShot(delay * 0.001);
1421 }
1422
1423 static bool isObjectAncestorContainerOf(RenderObject* ancestor, RenderObject* descendant)
1424 {
1425     for (RenderObject* r = descendant; r; r = r->container()) {
1426         if (r == ancestor)
1427             return true;
1428     }
1429     return false;
1430 }
1431
1432 void FrameView::scheduleRelayoutOfSubtree(RenderObject* relayoutRoot)
1433 {
1434     ASSERT(m_frame->view() == this);
1435
1436     if (m_frame->contentRenderer() && m_frame->contentRenderer()->needsLayout()) {
1437         if (relayoutRoot)
1438             relayoutRoot->markContainingBlocksForLayout(false);
1439         return;
1440     }
1441
1442     if (layoutPending() || !m_layoutSchedulingEnabled) {
1443         if (m_layoutRoot != relayoutRoot) {
1444             if (isObjectAncestorContainerOf(m_layoutRoot, relayoutRoot)) {
1445                 // Keep the current root
1446                 relayoutRoot->markContainingBlocksForLayout(false, m_layoutRoot);
1447             } else if (m_layoutRoot && isObjectAncestorContainerOf(relayoutRoot, m_layoutRoot)) {
1448                 // Re-root at relayoutRoot
1449                 m_layoutRoot->markContainingBlocksForLayout(false, relayoutRoot);
1450                 m_layoutRoot = relayoutRoot;
1451             } else {
1452                 // Just do a full relayout
1453                 if (m_layoutRoot)
1454                     m_layoutRoot->markContainingBlocksForLayout(false);
1455                 m_layoutRoot = 0;
1456                 relayoutRoot->markContainingBlocksForLayout(false);
1457             }
1458         }
1459     } else if (m_layoutSchedulingEnabled) {
1460         int delay = m_frame->document()->minimumLayoutDelay();
1461         m_layoutRoot = relayoutRoot;
1462         m_delayedLayout = delay != 0;
1463         m_layoutTimer.startOneShot(delay * 0.001);
1464     }
1465 }
1466
1467 bool FrameView::layoutPending() const
1468 {
1469     return m_layoutTimer.isActive();
1470 }
1471
1472 bool FrameView::needsLayout() const
1473 {
1474     // This can return true in cases where the document does not have a body yet.
1475     // Document::shouldScheduleLayout takes care of preventing us from scheduling
1476     // layout in that case.
1477     if (!m_frame)
1478         return false;
1479     RenderView* root = m_frame->contentRenderer();
1480     return layoutPending()
1481         || (root && root->needsLayout())
1482         || m_layoutRoot
1483         || (m_deferSetNeedsLayouts && m_setNeedsLayoutWasDeferred);
1484 }
1485
1486 void FrameView::setNeedsLayout()
1487 {
1488     if (m_deferSetNeedsLayouts) {
1489         m_setNeedsLayoutWasDeferred = true;
1490         return;
1491     }
1492     RenderView* root = m_frame->contentRenderer();
1493     if (root)
1494         root->setNeedsLayout(true);
1495 }
1496
1497 void FrameView::unscheduleRelayout()
1498 {
1499     m_postLayoutTasksTimer.stop();
1500
1501     if (!m_layoutTimer.isActive())
1502         return;
1503
1504 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1505     if (!m_frame->document()->ownerElement())
1506         printf("Layout timer unscheduled at %d\n", m_frame->document()->elapsedTime());
1507 #endif
1508
1509     m_layoutTimer.stop();
1510     m_delayedLayout = false;
1511 }
1512
1513 bool FrameView::isTransparent() const
1514 {
1515     return m_isTransparent;
1516 }
1517
1518 void FrameView::setTransparent(bool isTransparent)
1519 {
1520     m_isTransparent = isTransparent;
1521 }
1522
1523 Color FrameView::baseBackgroundColor() const
1524 {
1525     return m_baseBackgroundColor;
1526 }
1527
1528 void FrameView::setBaseBackgroundColor(Color bc)
1529 {
1530     if (!bc.isValid())
1531         bc = Color::white;
1532     m_baseBackgroundColor = bc;
1533 }
1534
1535 void FrameView::updateBackgroundRecursively(const Color& backgroundColor, bool transparent)
1536 {
1537     for (Frame* frame = m_frame.get(); frame; frame = frame->tree()->traverseNext(m_frame.get())) {
1538         FrameView* view = frame->view();
1539         if (!view)
1540             continue;
1541
1542         view->setTransparent(transparent);
1543         view->setBaseBackgroundColor(backgroundColor);
1544     }
1545 }
1546
1547 bool FrameView::shouldUpdateWhileOffscreen() const
1548 {
1549     return m_shouldUpdateWhileOffscreen;
1550 }
1551
1552 void FrameView::setShouldUpdateWhileOffscreen(bool shouldUpdateWhileOffscreen)
1553 {
1554     m_shouldUpdateWhileOffscreen = shouldUpdateWhileOffscreen;
1555 }
1556
1557 void FrameView::scheduleEvent(PassRefPtr<Event> event, PassRefPtr<Node> eventTarget)
1558 {
1559     if (!m_enqueueEvents) {
1560         ExceptionCode ec = 0;
1561         eventTarget->dispatchEvent(event, ec);
1562         return;
1563     }
1564
1565     ScheduledEvent* scheduledEvent = new ScheduledEvent;
1566     scheduledEvent->m_event = event;
1567     scheduledEvent->m_eventTarget = eventTarget;
1568     m_scheduledEvents.append(scheduledEvent);
1569 }
1570
1571 void FrameView::pauseScheduledEvents()
1572 {
1573     ASSERT(m_scheduledEvents.isEmpty() || m_enqueueEvents);
1574     m_enqueueEvents++;
1575 }
1576
1577 void FrameView::resumeScheduledEvents()
1578 {
1579     m_enqueueEvents--;
1580     if (!m_enqueueEvents)
1581         dispatchScheduledEvents();
1582     ASSERT(m_scheduledEvents.isEmpty() || m_enqueueEvents);
1583 }
1584
1585 void FrameView::scrollToAnchor()
1586 {
1587     RefPtr<Node> anchorNode = m_maintainScrollPositionAnchor;
1588     if (!anchorNode)
1589         return;
1590
1591     if (!anchorNode->renderer())
1592         return;
1593
1594     IntRect rect;
1595     if (anchorNode != m_frame->document())
1596         rect = anchorNode->getRect();
1597
1598     // Scroll nested layers and frames to reveal the anchor.
1599     // Align to the top and to the closest side (this matches other browsers).
1600     anchorNode->renderer()->enclosingLayer()->scrollRectToVisible(rect, true, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignTopAlways);
1601
1602     if (AXObjectCache::accessibilityEnabled())
1603         m_frame->document()->axObjectCache()->handleScrolledToAnchor(anchorNode.get());
1604
1605     // scrollRectToVisible can call into setScrollPosition(), which resets m_maintainScrollPositionAnchor.
1606     m_maintainScrollPositionAnchor = anchorNode;
1607 }
1608
1609 void FrameView::updateWidget(RenderEmbeddedObject* object)
1610 {
1611     ASSERT(!object->node() || object->node()->isElementNode());
1612     Element* ownerElement = static_cast<Element*>(object->node());
1613     // The object may have already been destroyed (thus node cleared),
1614     // but FrameView holds a manual ref, so it won't have been deleted.
1615     ASSERT(m_widgetUpdateSet->contains(object));
1616     if (!ownerElement)
1617         return;
1618
1619     // No need to update if it's already crashed or known to be missing.
1620     if (object->pluginCrashedOrWasMissing())
1621         return;
1622
1623     // FIXME: This could turn into a real virtual dispatch if we defined
1624     // updateWidget(bool) on HTMLElement.
1625     if (ownerElement->hasTagName(objectTag) || ownerElement->hasTagName(embedTag))
1626         static_cast<HTMLPlugInImageElement*>(ownerElement)->updateWidget(false);
1627     // FIXME: It is not clear that Media elements need or want this updateWidget() call.
1628 #if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
1629     else if (ownerElement->hasTagName(videoTag) || ownerElement->hasTagName(audioTag))
1630         static_cast<HTMLMediaElement*>(ownerElement)->updateWidget(false);
1631 #endif
1632     else
1633         ASSERT_NOT_REACHED();
1634
1635     // Caution: it's possible the object was destroyed again, since loading a
1636     // plugin may run any arbitrary javascript.
1637     object->updateWidgetPosition();
1638 }
1639
1640 bool FrameView::updateWidgets()
1641 {
1642     if (m_nestedLayoutCount > 1 || !m_widgetUpdateSet || m_widgetUpdateSet->isEmpty())
1643         return true;
1644
1645     size_t size = m_widgetUpdateSet->size();
1646
1647     Vector<RenderEmbeddedObject*> objects;
1648     objects.reserveCapacity(size);
1649
1650     RenderEmbeddedObjectSet::const_iterator end = m_widgetUpdateSet->end();
1651     for (RenderEmbeddedObjectSet::const_iterator it = m_widgetUpdateSet->begin(); it != end; ++it) {
1652         objects.uncheckedAppend(*it);
1653         (*it)->ref();
1654     }
1655
1656     for (size_t i = 0; i < size; ++i) {
1657         RenderEmbeddedObject* object = objects[i];
1658         updateWidget(object);
1659         m_widgetUpdateSet->remove(object);
1660     }
1661
1662     RenderArena* arena = m_frame->document()->renderArena();
1663     for (size_t i = 0; i < size; ++i)
1664         objects[i]->deref(arena);
1665
1666     return m_widgetUpdateSet->isEmpty();
1667 }
1668
1669 void FrameView::performPostLayoutTasks()
1670 {
1671     m_hasPendingPostLayoutTasks = false;
1672
1673     if (m_firstLayoutCallbackPending) {
1674         m_firstLayoutCallbackPending = false;
1675         m_frame->loader()->didFirstLayout();
1676     }
1677
1678     if (m_isVisuallyNonEmpty && m_firstVisuallyNonEmptyLayoutCallbackPending) {
1679         m_firstVisuallyNonEmptyLayoutCallbackPending = false;
1680         m_frame->loader()->didFirstVisuallyNonEmptyLayout();
1681     }
1682
1683     RenderView* root = m_frame->contentRenderer();
1684
1685     root->updateWidgetPositions();
1686
1687     for (unsigned i = 0; i < maxUpdateWidgetsIterations; i++) {
1688         if (updateWidgets())
1689             break;
1690     }
1691
1692     scrollToAnchor();
1693
1694     resumeScheduledEvents();
1695
1696     if (!root->printing()) {
1697         IntSize currentSize = IntSize(width(), height());
1698         float currentZoomFactor = root->style()->zoom();
1699         bool resized = !m_firstLayout && (currentSize != m_lastLayoutSize || currentZoomFactor != m_lastZoomFactor);
1700         m_lastLayoutSize = currentSize;
1701         m_lastZoomFactor = currentZoomFactor;
1702         if (resized)
1703             m_frame->eventHandler()->sendResizeEvent();
1704     }
1705 }
1706
1707 void FrameView::postLayoutTimerFired(Timer<FrameView>*)
1708 {
1709     performPostLayoutTasks();
1710 }
1711
1712 void FrameView::updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow)
1713 {
1714     if (!m_viewportRenderer)
1715         return;
1716
1717     if (m_overflowStatusDirty) {
1718         m_horizontalOverflow = horizontalOverflow;
1719         m_verticalOverflow = verticalOverflow;
1720         m_overflowStatusDirty = false;
1721         return;
1722     }
1723
1724     bool horizontalOverflowChanged = (m_horizontalOverflow != horizontalOverflow);
1725     bool verticalOverflowChanged = (m_verticalOverflow != verticalOverflow);
1726
1727     if (horizontalOverflowChanged || verticalOverflowChanged) {
1728         m_horizontalOverflow = horizontalOverflow;
1729         m_verticalOverflow = verticalOverflow;
1730
1731         scheduleEvent(OverflowEvent::create(horizontalOverflowChanged, horizontalOverflow,
1732             verticalOverflowChanged, verticalOverflow),
1733             m_viewportRenderer->node());
1734     }
1735
1736 }
1737
1738 void FrameView::dispatchScheduledEvents()
1739 {
1740     if (m_scheduledEvents.isEmpty())
1741         return;
1742
1743     Vector<ScheduledEvent*> scheduledEventsCopy = m_scheduledEvents;
1744     m_scheduledEvents.clear();
1745
1746     Vector<ScheduledEvent*>::iterator end = scheduledEventsCopy.end();
1747     for (Vector<ScheduledEvent*>::iterator it = scheduledEventsCopy.begin(); it != end; ++it) {
1748         ScheduledEvent* scheduledEvent = *it;
1749
1750         ExceptionCode ec = 0;
1751
1752         // Only dispatch events to nodes that are in the document
1753         if (scheduledEvent->m_eventTarget->inDocument())
1754             scheduledEvent->m_eventTarget->dispatchEvent(scheduledEvent->m_event, ec);
1755
1756         delete scheduledEvent;
1757     }
1758 }
1759
1760 IntRect FrameView::windowClipRect(bool clipToContents) const
1761 {
1762     ASSERT(m_frame->view() == this);
1763
1764     // Set our clip rect to be our contents.
1765     IntRect clipRect = contentsToWindow(visibleContentRect(!clipToContents));
1766     if (!m_frame || !m_frame->document() || !m_frame->document()->ownerElement())
1767         return clipRect;
1768
1769     // Take our owner element and get the clip rect from the enclosing layer.
1770     Element* elt = m_frame->document()->ownerElement();
1771     RenderLayer* layer = elt->renderer()->enclosingLayer();
1772     // FIXME: layer should never be null, but sometimes seems to be anyway.
1773     if (!layer)
1774         return clipRect;
1775     FrameView* parentView = elt->document()->view();
1776     clipRect.intersect(parentView->windowClipRectForLayer(layer, true));
1777     return clipRect;
1778 }
1779
1780 IntRect FrameView::windowClipRectForLayer(const RenderLayer* layer, bool clipToLayerContents) const
1781 {
1782     // If we have no layer, just return our window clip rect.
1783     if (!layer)
1784         return windowClipRect();
1785
1786     // Apply the clip from the layer.
1787     IntRect clipRect;
1788     if (clipToLayerContents)
1789         clipRect = layer->childrenClipRect();
1790     else
1791         clipRect = layer->selfClipRect();
1792     clipRect = contentsToWindow(clipRect);
1793     return intersection(clipRect, windowClipRect());
1794 }
1795
1796 bool FrameView::isActive() const
1797 {
1798     Page* page = frame()->page();
1799     return page && page->focusController()->isActive();
1800 }
1801
1802 void FrameView::valueChanged(Scrollbar* bar)
1803 {
1804     // Figure out if we really moved.
1805     IntSize offset = scrollOffset();
1806     ScrollView::valueChanged(bar);
1807     if (offset != scrollOffset())
1808         scrollPositionChanged();
1809     frame()->loader()->client()->didChangeScrollOffset();
1810 }
1811
1812 void FrameView::valueChanged(const IntSize& scrollDelta)
1813 {
1814     ScrollView::valueChanged(scrollDelta);
1815     frame()->eventHandler()->sendScrollEvent();
1816     frame()->loader()->client()->didChangeScrollOffset();
1817 }
1818
1819 void FrameView::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
1820 {
1821     // Add in our offset within the FrameView.
1822     IntRect dirtyRect = rect;
1823     dirtyRect.move(scrollbar->x(), scrollbar->y());
1824     invalidateRect(dirtyRect);
1825 }
1826
1827 void FrameView::getTickmarks(Vector<IntRect>& tickmarks) const
1828 {
1829     tickmarks = frame()->document()->markers()->renderedRectsForMarkers(DocumentMarker::TextMatch);
1830 }
1831
1832 IntRect FrameView::windowResizerRect() const
1833 {
1834     Page* page = frame() ? frame()->page() : 0;
1835     if (!page)
1836         return IntRect();
1837     return page->chrome()->windowResizerRect();
1838 }
1839
1840 #if ENABLE(DASHBOARD_SUPPORT)
1841 void FrameView::updateDashboardRegions()
1842 {
1843     Document* document = m_frame->document();
1844     if (!document->hasDashboardRegions())
1845         return;
1846     Vector<DashboardRegionValue> newRegions;
1847     document->renderBox()->collectDashboardRegions(newRegions);
1848     if (newRegions == document->dashboardRegions())
1849         return;
1850     document->setDashboardRegions(newRegions);
1851     Page* page = m_frame->page();
1852     if (!page)
1853         return;
1854     page->chrome()->client()->dashboardRegionsChanged();
1855 }
1856 #endif
1857
1858 void FrameView::invalidateScrollCorner()
1859 {
1860     invalidateRect(scrollCornerRect());
1861 }
1862
1863 void FrameView::updateScrollCorner()
1864 {
1865     RenderObject* renderer = 0;
1866     RefPtr<RenderStyle> cornerStyle;
1867
1868     if (!scrollCornerRect().isEmpty()) {
1869         // Try the <body> element first as a scroll corner source.
1870         Document* doc = m_frame->document();
1871         Element* body = doc ? doc->body() : 0;
1872         if (body && body->renderer()) {
1873             renderer = body->renderer();
1874             cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1875         }
1876
1877         if (!cornerStyle) {
1878             // If the <body> didn't have a custom style, then the root element might.
1879             Element* docElement = doc ? doc->documentElement() : 0;
1880             if (docElement && docElement->renderer()) {
1881                 renderer = docElement->renderer();
1882                 cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1883             }
1884         }
1885
1886         if (!cornerStyle) {
1887             // If we have an owning iframe/frame element, then it can set the custom scrollbar also.
1888             if (RenderPart* renderer = m_frame->ownerRenderer())
1889                 cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1890         }
1891     }
1892
1893     if (cornerStyle) {
1894         if (!m_scrollCorner)
1895             m_scrollCorner = new (renderer->renderArena()) RenderScrollbarPart(renderer->document());
1896         m_scrollCorner->setStyle(cornerStyle.release());
1897         invalidateRect(scrollCornerRect());
1898     } else if (m_scrollCorner) {
1899         m_scrollCorner->destroy();
1900         m_scrollCorner = 0;
1901     }
1902 }
1903
1904 void FrameView::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
1905 {
1906     if (context->updatingControlTints()) {
1907         updateScrollCorner();
1908         return;
1909     }
1910
1911     if (m_scrollCorner) {
1912         m_scrollCorner->paintIntoRect(context, cornerRect.x(), cornerRect.y(), cornerRect);
1913         return;
1914     }
1915
1916     ScrollView::paintScrollCorner(context, cornerRect);
1917 }
1918
1919 bool FrameView::hasCustomScrollbars() const
1920 {
1921     const HashSet<RefPtr<Widget> >* viewChildren = children();
1922     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
1923     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
1924         Widget* widget = current->get();
1925         if (widget->isFrameView()) {
1926             if (static_cast<FrameView*>(widget)->hasCustomScrollbars())
1927                 return true;
1928         } else if (widget->isScrollbar()) {
1929             Scrollbar* scrollbar = static_cast<Scrollbar*>(widget);
1930             if (scrollbar->isCustomScrollbar())
1931                 return true;
1932         }
1933     }
1934
1935     return false;
1936 }
1937
1938 void FrameView::updateControlTints()
1939 {
1940     // This is called when control tints are changed from aqua/graphite to clear and vice versa.
1941     // We do a "fake" paint, and when the theme gets a paint call, it can then do an invalidate.
1942     // This is only done if the theme supports control tinting. It's up to the theme and platform
1943     // to define when controls get the tint and to call this function when that changes.
1944
1945     // Optimize the common case where we bring a window to the front while it's still empty.
1946     if (!m_frame || m_frame->loader()->url().isEmpty())
1947         return;
1948
1949     if ((m_frame->contentRenderer() && m_frame->contentRenderer()->theme()->supportsControlTints()) || hasCustomScrollbars())  {
1950         if (needsLayout())
1951             layout();
1952         PlatformGraphicsContext* const noContext = 0;
1953         GraphicsContext context(noContext);
1954         context.setUpdatingControlTints(true);
1955         if (platformWidget())
1956             paintContents(&context, visibleContentRect());
1957         else
1958             paint(&context, frameRect());
1959     }
1960 }
1961
1962 bool FrameView::wasScrolledByUser() const
1963 {
1964     return m_wasScrolledByUser;
1965 }
1966
1967 void FrameView::setWasScrolledByUser(bool wasScrolledByUser)
1968 {
1969     if (m_inProgrammaticScroll)
1970         return;
1971     m_maintainScrollPositionAnchor = 0;
1972     m_wasScrolledByUser = wasScrolledByUser;
1973 }
1974
1975 void FrameView::paintContents(GraphicsContext* p, const IntRect& rect)
1976 {
1977     if (!frame())
1978         return;
1979
1980     InspectorInstrumentationCookie cookie = InspectorInstrumentation::willPaint(m_frame.get(), rect);
1981
1982     Document* document = frame()->document();
1983
1984 #ifndef NDEBUG
1985     bool fillWithRed;
1986     if (document->printing())
1987         fillWithRed = false; // Printing, don't fill with red (can't remember why).
1988     else if (document->ownerElement())
1989         fillWithRed = false; // Subframe, don't fill with red.
1990     else if (isTransparent())
1991         fillWithRed = false; // Transparent, don't fill with red.
1992     else if (m_paintBehavior & PaintBehaviorSelectionOnly)
1993         fillWithRed = false; // Selections are transparent, don't fill with red.
1994     else if (m_nodeToDraw)
1995         fillWithRed = false; // Element images are transparent, don't fill with red.
1996     else
1997         fillWithRed = true;
1998
1999     if (fillWithRed)
2000         p->fillRect(rect, Color(0xFF, 0, 0), ColorSpaceDeviceRGB);
2001 #endif
2002
2003     bool isTopLevelPainter = !sCurrentPaintTimeStamp;
2004     if (isTopLevelPainter)
2005         sCurrentPaintTimeStamp = currentTime();
2006
2007     RenderView* contentRenderer = frame()->contentRenderer();
2008     if (!contentRenderer) {
2009         LOG_ERROR("called FrameView::paint with nil renderer");
2010         return;
2011     }
2012
2013     ASSERT(!needsLayout());
2014     if (needsLayout())
2015         return;
2016
2017 #if USE(ACCELERATED_COMPOSITING)
2018     if (!p->paintingDisabled()) {
2019         if (GraphicsLayer* rootLayer = contentRenderer->compositor()->rootPlatformLayer())
2020             rootLayer->syncCompositingState();
2021     }
2022 #endif
2023
2024     ASSERT(!m_isPainting);
2025
2026     m_isPainting = true;
2027
2028     // m_nodeToDraw is used to draw only one element (and its descendants)
2029     RenderObject* eltRenderer = m_nodeToDraw ? m_nodeToDraw->renderer() : 0;
2030
2031     PaintBehavior oldPaintBehavior = m_paintBehavior;
2032     if (m_paintBehavior == PaintBehaviorNormal)
2033         document->markers()->invalidateRenderedRectsForMarkersInRect(rect);
2034
2035     if (document->printing())
2036         m_paintBehavior |= PaintBehaviorFlattenCompositingLayers;
2037
2038     contentRenderer->layer()->paint(p, rect, m_paintBehavior, eltRenderer);
2039
2040     m_paintBehavior = oldPaintBehavior;
2041
2042     m_isPainting = false;
2043     m_lastPaintTime = currentTime();
2044
2045 #if ENABLE(DASHBOARD_SUPPORT)
2046     // Regions may have changed as a result of the visibility/z-index of element changing.
2047     if (document->dashboardRegionsDirty())
2048         updateDashboardRegions();
2049 #endif
2050
2051     if (isTopLevelPainter)
2052         sCurrentPaintTimeStamp = 0;
2053
2054     InspectorInstrumentation::didPaint(cookie);
2055 }
2056
2057 void FrameView::setPaintBehavior(PaintBehavior behavior)
2058 {
2059     m_paintBehavior = behavior;
2060 }
2061
2062 PaintBehavior FrameView::paintBehavior() const
2063 {
2064     return m_paintBehavior;
2065 }
2066
2067 bool FrameView::isPainting() const
2068 {
2069     return m_isPainting;
2070 }
2071
2072 void FrameView::setNodeToDraw(Node* node)
2073 {
2074     m_nodeToDraw = node;
2075 }
2076
2077 void FrameView::updateLayoutAndStyleIfNeededRecursive()
2078 {
2079     // We have to crawl our entire tree looking for any FrameViews that need
2080     // layout and make sure they are up to date.
2081     // Mac actually tests for intersection with the dirty region and tries not to
2082     // update layout for frames that are outside the dirty region.  Not only does this seem
2083     // pointless (since those frames will have set a zero timer to layout anyway), but
2084     // it is also incorrect, since if two frames overlap, the first could be excluded from the dirty
2085     // region but then become included later by the second frame adding rects to the dirty region
2086     // when it lays out.
2087
2088     m_frame->document()->updateStyleIfNeeded();
2089
2090     if (needsLayout())
2091         layout();
2092
2093     const HashSet<RefPtr<Widget> >* viewChildren = children();
2094     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
2095     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
2096         Widget* widget = (*current).get();
2097         if (widget->isFrameView())
2098             static_cast<FrameView*>(widget)->updateLayoutAndStyleIfNeededRecursive();
2099     }
2100
2101     // updateLayoutAndStyleIfNeededRecursive is called when we need to make sure style and layout are up-to-date before
2102     // painting, so we need to flush out any deferred repaints too.
2103     flushDeferredRepaints();
2104 }
2105
2106 void FrameView::flushDeferredRepaints()
2107 {
2108     if (!m_deferredRepaintTimer.isActive())
2109         return;
2110     m_deferredRepaintTimer.stop();
2111     doDeferredRepaints();
2112 }
2113
2114 void FrameView::forceLayout(bool allowSubtree)
2115 {
2116     layout(allowSubtree);
2117 }
2118
2119 void FrameView::forceLayoutForPagination(const FloatSize& pageSize, float maximumShrinkFactor, Frame::AdjustViewSizeOrNot shouldAdjustViewSize)
2120 {
2121     // Dumping externalRepresentation(m_frame->renderer()).ascii() is a good trick to see
2122     // the state of things before and after the layout
2123     RenderView *root = toRenderView(m_frame->document()->renderer());
2124     if (root) {
2125         int pageW = ceilf(pageSize.width());
2126         root->setWidth(pageW);
2127         root->setPageHeight(pageSize.height());
2128         root->setNeedsLayoutAndPrefWidthsRecalc();
2129         forceLayout();
2130
2131         // If we don't fit in the given page width, we'll lay out again. If we don't fit in the
2132         // page width when shrunk, we will lay out at maximum shrink and clip extra content.
2133         // FIXME: We are assuming a shrink-to-fit printing implementation.  A cropping
2134         // implementation should not do this!
2135         int rightmostPos = root->rightmostPosition();
2136         if (rightmostPos > pageSize.width()) {
2137             pageW = std::min<int>(rightmostPos, ceilf(pageSize.width() * maximumShrinkFactor));
2138             if (pageSize.height())
2139                 root->setPageHeight(pageW / pageSize.width() * pageSize.height());
2140             root->setWidth(pageW);
2141             root->setNeedsLayoutAndPrefWidthsRecalc();
2142             forceLayout();
2143             int docHeight = root->bottomLayoutOverflow();
2144             root->clearLayoutOverflow();
2145             root->addLayoutOverflow(IntRect(0, 0, pageW, docHeight)); // This is how we clip in case we overflow again.
2146         }
2147     }
2148
2149     if (shouldAdjustViewSize)
2150         adjustViewSize();
2151 }
2152
2153 void FrameView::adjustPageHeightDeprecated(float *newBottom, float oldTop, float oldBottom, float /*bottomLimit*/)
2154 {
2155     RenderView* root = m_frame->contentRenderer();
2156     if (root) {
2157         // Use a context with painting disabled.
2158         GraphicsContext context((PlatformGraphicsContext*)0);
2159         root->setTruncatedAt((int)floorf(oldBottom));
2160         IntRect dirtyRect(0, (int)floorf(oldTop), root->rightLayoutOverflow(), (int)ceilf(oldBottom - oldTop));
2161         root->setPrintRect(dirtyRect);
2162         root->layer()->paint(&context, dirtyRect);
2163         *newBottom = root->bestTruncatedAt();
2164         if (*newBottom == 0)
2165             *newBottom = oldBottom;
2166         root->setPrintRect(IntRect());
2167     } else
2168         *newBottom = oldBottom;
2169 }
2170
2171 IntRect FrameView::convertFromRenderer(const RenderObject* renderer, const IntRect& rendererRect) const
2172 {
2173     IntRect rect = renderer->localToAbsoluteQuad(FloatRect(rendererRect)).enclosingBoundingBox();
2174
2175     // Convert from page ("absolute") to FrameView coordinates.
2176     rect.move(-scrollX(), -scrollY());
2177
2178     return rect;
2179 }
2180
2181 IntRect FrameView::convertToRenderer(const RenderObject* renderer, const IntRect& viewRect) const
2182 {
2183     IntRect rect = viewRect;
2184
2185     // Convert from FrameView coords into page ("absolute") coordinates.
2186     rect.move(scrollX(), scrollY());
2187
2188     // FIXME: we don't have a way to map an absolute rect down to a local quad, so just
2189     // move the rect for now.
2190     rect.setLocation(roundedIntPoint(renderer->absoluteToLocal(rect.location(), false, true /* use transforms */)));
2191     return rect;
2192 }
2193
2194 IntPoint FrameView::convertFromRenderer(const RenderObject* renderer, const IntPoint& rendererPoint) const
2195 {
2196     IntPoint point = roundedIntPoint(renderer->localToAbsolute(rendererPoint, false, true /* use transforms */));
2197
2198     // Convert from page ("absolute") to FrameView coordinates.
2199     point.move(-scrollX(), -scrollY());
2200     return point;
2201 }
2202
2203 IntPoint FrameView::convertToRenderer(const RenderObject* renderer, const IntPoint& viewPoint) const
2204 {
2205     IntPoint point = viewPoint;
2206
2207     // Convert from FrameView coords into page ("absolute") coordinates.
2208     point += IntSize(scrollX(), scrollY());
2209
2210     return roundedIntPoint(renderer->absoluteToLocal(point, false, true /* use transforms */));
2211 }
2212
2213 IntRect FrameView::convertToContainingView(const IntRect& localRect) const
2214 {
2215     if (const ScrollView* parentScrollView = parent()) {
2216         if (parentScrollView->isFrameView()) {
2217             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2218             // Get our renderer in the parent view
2219             RenderPart* renderer = m_frame->ownerRenderer();
2220             if (!renderer)
2221                 return localRect;
2222
2223             IntRect rect(localRect);
2224             // Add borders and padding??
2225             rect.move(renderer->borderLeft() + renderer->paddingLeft(),
2226                       renderer->borderTop() + renderer->paddingTop());
2227             return parentView->convertFromRenderer(renderer, rect);
2228         }
2229
2230         return Widget::convertToContainingView(localRect);
2231     }
2232
2233     return localRect;
2234 }
2235
2236 IntRect FrameView::convertFromContainingView(const IntRect& parentRect) const
2237 {
2238     if (const ScrollView* parentScrollView = parent()) {
2239         if (parentScrollView->isFrameView()) {
2240             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2241
2242             // Get our renderer in the parent view
2243             RenderPart* renderer = m_frame->ownerRenderer();
2244             if (!renderer)
2245                 return parentRect;
2246
2247             IntRect rect = parentView->convertToRenderer(renderer, parentRect);
2248             // Subtract borders and padding
2249             rect.move(-renderer->borderLeft() - renderer->paddingLeft(),
2250                       -renderer->borderTop() - renderer->paddingTop());
2251             return rect;
2252         }
2253
2254         return Widget::convertFromContainingView(parentRect);
2255     }
2256
2257     return parentRect;
2258 }
2259
2260 IntPoint FrameView::convertToContainingView(const IntPoint& localPoint) const
2261 {
2262     if (const ScrollView* parentScrollView = parent()) {
2263         if (parentScrollView->isFrameView()) {
2264             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2265
2266             // Get our renderer in the parent view
2267             RenderPart* renderer = m_frame->ownerRenderer();
2268             if (!renderer)
2269                 return localPoint;
2270
2271             IntPoint point(localPoint);
2272
2273             // Add borders and padding
2274             point.move(renderer->borderLeft() + renderer->paddingLeft(),
2275                        renderer->borderTop() + renderer->paddingTop());
2276             return parentView->convertFromRenderer(renderer, point);
2277         }
2278
2279         return Widget::convertToContainingView(localPoint);
2280     }
2281
2282     return localPoint;
2283 }
2284
2285 IntPoint FrameView::convertFromContainingView(const IntPoint& parentPoint) const
2286 {
2287     if (const ScrollView* parentScrollView = parent()) {
2288         if (parentScrollView->isFrameView()) {
2289             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2290
2291             // Get our renderer in the parent view
2292             RenderPart* renderer = m_frame->ownerRenderer();
2293             if (!renderer)
2294                 return parentPoint;
2295
2296             IntPoint point = parentView->convertToRenderer(renderer, parentPoint);
2297             // Subtract borders and padding
2298             point.move(-renderer->borderLeft() - renderer->paddingLeft(),
2299                        -renderer->borderTop() - renderer->paddingTop());
2300             return point;
2301         }
2302
2303         return Widget::convertFromContainingView(parentPoint);
2304     }
2305
2306     return parentPoint;
2307 }
2308
2309 // Normal delay
2310 void FrameView::setRepaintThrottlingDeferredRepaintDelay(double p)
2311 {
2312     s_deferredRepaintDelay = p;
2313 }
2314
2315 // Negative value would mean that first few repaints happen without a delay
2316 void FrameView::setRepaintThrottlingnInitialDeferredRepaintDelayDuringLoading(double p)
2317 {
2318     s_initialDeferredRepaintDelayDuringLoading = p;
2319 }
2320
2321 // The delay grows on each repaint to this maximum value
2322 void FrameView::setRepaintThrottlingMaxDeferredRepaintDelayDuringLoading(double p)
2323 {
2324     s_maxDeferredRepaintDelayDuringLoading = p;
2325 }
2326
2327 // On each repaint the delay increases by this amount
2328 void FrameView::setRepaintThrottlingDeferredRepaintDelayIncrementDuringLoading(double p)
2329 {
2330     s_deferredRepaintDelayIncrementDuringLoading = p;
2331 }
2332
2333 } // namespace WebCore