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 "Chrome.h"
  33 #include "ChromeClient.h"
  34 #include "DocLoader.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 "InspectorTimelineAgent.h"
  48 #include "OverflowEvent.h"
  49 #include "RenderEmbeddedObject.h"
  50 #include "RenderLayer.h"
  51 #include "RenderPart.h"
  52 #include "RenderScrollbar.h"
  53 #include "RenderScrollbarPart.h"
  54 #include "RenderTheme.h"
  55 #include "RenderView.h"
  56 #include "Settings.h"
  57 #include "TextResourceDecoder.h"
  58 #include <wtf/CurrentTime.h>
  59
  60 #ifdef ANDROID_INSTRUMENT
  61 #include "FrameTree.h"
  62 #include "TimeCounter.h"
  63 #endif
  64
  65 #if USE(ACCELERATED_COMPOSITING)
  66 #include "RenderLayerCompositor.h"
  67 #endif
  68
  69 #if ENABLE(SVG)
  70 #include "SVGDocument.h"
  71 #include "SVGLocatable.h"
  72 #include "SVGNames.h"
  73 #include "SVGPreserveAspectRatio.h"
  74 #include "SVGSVGElement.h"
  75 #include "SVGViewElement.h"
  76 #include "SVGViewSpec.h"
  77 #endif
  78
  79 #if ENABLE(TILED_BACKING_STORE)
  80 #include "TiledBackingStore.h"
  81 #endif
  82
  83 #if PLATFORM(ANDROID)
  84 #include "WebCoreFrameBridge.h"
  85 #endif
  86
  87 namespace WebCore {
  88
  89 using namespace HTMLNames;
  90
  91 double FrameView::sCurrentPaintTimeStamp = 0.0;
  92
  93 // REPAINT_THROTTLING now chooses default values for throttling parameters.
  94 // Should be removed when applications start using runtime configuration.
  95 #if ENABLE(REPAINT_THROTTLING)
  96 // Normal delay
  97 double FrameView::s_deferredRepaintDelay = 0.025;
  98 // Negative value would mean that first few repaints happen without a delay
  99 double FrameView::s_initialDeferredRepaintDelayDuringLoading = 0;
 100 // The delay grows on each repaint to this maximum value
 101 double FrameView::s_maxDeferredRepaintDelayDuringLoading = 2.5;
 102 // On each repaint the delay increses by this amount
 103 double FrameView::s_deferredRepaintDelayIncrementDuringLoading = 0.5;
 104 #else
 105 // FIXME: Repaint throttling could be good to have on all platform.
 106 // The balance between CPU use and repaint frequency will need some tuning for desktop.
 107 // More hooks may be needed to reset the delay on things like GIF and CSS animations.
 108 double FrameView::s_deferredRepaintDelay = 0;
 109 double FrameView::s_initialDeferredRepaintDelayDuringLoading = 0;
 110 double FrameView::s_maxDeferredRepaintDelayDuringLoading = 0;
 111 double FrameView::s_deferredRepaintDelayIncrementDuringLoading = 0;
 112 #endif
 113
 114 // The maximum number of updateWidgets iterations that should be done before returning.
 115 static const unsigned maxUpdateWidgetsIterations = 2;
 116
 117 struct ScheduledEvent : Noncopyable {
 118     RefPtr<Event> m_event;
 119     RefPtr<Node> m_eventTarget;
 120 };
 121
 122 static inline float parentZoomFactor(Frame* frame)
 123 {
 124     Frame* parent = frame->tree()->parent();
 125     if (!parent)
 126         return 1;
 127     FrameView* parentView = parent->view();
 128     if (!parentView)
 129         return 1;
 130     return parentView->zoomFactor();
 131 }
 132
 133 FrameView::FrameView(Frame* frame)
 134     : m_frame(frame)
 135     , m_canHaveScrollbars(true)
 136     , m_slowRepaintObjectCount(0)
 137     , m_fixedObjectCount(0)
 138     , m_layoutTimer(this, &FrameView::layoutTimerFired)
 139     , m_layoutRoot(0)
 140     , m_postLayoutTasksTimer(this, &FrameView::postLayoutTimerFired)
 141     , m_isTransparent(false)
 142     , m_baseBackgroundColor(Color::white)
 143     , m_mediaType("screen")
 144     , m_enqueueEvents(0)
 145     , m_overflowStatusDirty(true)
 146     , m_viewportRenderer(0)
 147     , m_wasScrolledByUser(false)
 148     , m_inProgrammaticScroll(false)
 149     , m_deferredRepaintTimer(this, &FrameView::deferredRepaintTimerFired)
 150     , m_shouldUpdateWhileOffscreen(true)
 151     , m_deferSetNeedsLayouts(0)
 152     , m_setNeedsLayoutWasDeferred(false)
 153     , m_scrollCorner(0)
 154     , m_zoomFactor(parentZoomFactor(frame))
 155 {
 156     init();
 157 }
 158
 159 PassRefPtr<FrameView> FrameView::create(Frame* frame)
 160 {
 161     RefPtr<FrameView> view = adoptRef(new FrameView(frame));
 162     view->show();
 163     return view.release();
 164 }
 165
 166 PassRefPtr<FrameView> FrameView::create(Frame* frame, const IntSize& initialSize)
 167 {
 168     RefPtr<FrameView> view = adoptRef(new FrameView(frame));
 169     view->Widget::setFrameRect(IntRect(view->pos(), initialSize));
 170     view->show();
 171     return view.release();
 172 }
 173
 174 FrameView::~FrameView()
 175 {
 176     if (m_postLayoutTasksTimer.isActive()) {
 177         m_postLayoutTasksTimer.stop();
 178         m_scheduledEvents.clear();
 179         m_enqueueEvents = 0;
 180     }
 181
 182     resetScrollbars();
 183
 184     // Custom scrollbars should already be destroyed at this point
 185     ASSERT(!horizontalScrollbar() || !horizontalScrollbar()->isCustomScrollbar());
 186     ASSERT(!verticalScrollbar() || !verticalScrollbar()->isCustomScrollbar());
 187
 188     setHasHorizontalScrollbar(false); // Remove native scrollbars now before we lose the connection to the HostWindow.
 189     setHasVerticalScrollbar(false);
 190
 191     ASSERT(!m_scrollCorner);
 192     ASSERT(m_scheduledEvents.isEmpty());
 193     ASSERT(!m_enqueueEvents);
 194
 195     if (m_frame) {
 196         ASSERT(m_frame->view() != this || !m_frame->contentRenderer());
 197         RenderPart* renderer = m_frame->ownerRenderer();
 198         if (renderer && renderer->widget() == this)
 199             renderer->setWidget(0);
 200     }
 201 }
 202
 203 void FrameView::reset()
 204 {
 205     m_useSlowRepaints = false;
 206     m_isOverlapped = false;
 207     m_contentIsOpaque = false;
 208     m_borderX = 30;
 209     m_borderY = 30;
 210     m_layoutTimer.stop();
 211     m_layoutRoot = 0;
 212     m_delayedLayout = false;
 213     m_doFullRepaint = true;
 214     m_layoutSchedulingEnabled = true;
 215     m_inLayout = false;
 216     m_layoutCount = 0;
 217     m_nestedLayoutCount = 0;
 218     m_postLayoutTasksTimer.stop();
 219     m_firstLayout = true;
 220     m_firstLayoutCallbackPending = false;
 221     m_wasScrolledByUser = false;
 222     m_lastLayoutSize = IntSize();
 223     m_lastZoomFactor = 1.0f;
 224     m_pageHeight = 0;
 225     m_deferringRepaints = 0;
 226     m_repaintCount = 0;
 227     m_repaintRects.clear();
 228     m_deferredRepaintDelay = s_initialDeferredRepaintDelayDuringLoading;
 229     m_deferredRepaintTimer.stop();
 230     m_lastPaintTime = 0;
 231     m_paintBehavior = PaintBehaviorNormal;
 232     m_isPainting = false;
 233     m_isVisuallyNonEmpty = false;
 234     m_firstVisuallyNonEmptyLayoutCallbackPending = true;
 235     m_maintainScrollPositionAnchor = 0;
 236 }
 237
 238 bool FrameView::isFrameView() const
 239 {
 240     return true;
 241 }
 242
 243 void FrameView::clearFrame()
 244 {
 245     m_frame = 0;
 246 }
 247
 248 void FrameView::resetScrollbars()
 249 {
 250     // Reset the document's scrollbars back to our defaults before we yield the floor.
 251     m_firstLayout = true;
 252     setScrollbarsSuppressed(true);
 253     if (m_canHaveScrollbars)
 254         setScrollbarModes(ScrollbarAuto, ScrollbarAuto);
 255     else
 256         setScrollbarModes(ScrollbarAlwaysOff, ScrollbarAlwaysOff);
 257     setScrollbarsSuppressed(false);
 258 }
 259
 260 void FrameView::init()
 261 {
 262     reset();
 263
 264     m_margins = IntSize(-1, -1); // undefined
 265     m_size = IntSize();
 266
 267     // Propagate the marginwidth/height and scrolling modes to the view.
 268     Element* ownerElement = m_frame && m_frame->document() ? m_frame->document()->ownerElement() : 0;
 269     if (ownerElement && (ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(iframeTag))) {
 270         HTMLFrameElement* frameElt = static_cast<HTMLFrameElement*>(ownerElement);
 271         if (frameElt->scrollingMode() == ScrollbarAlwaysOff)
 272             setCanHaveScrollbars(false);
 273         int marginWidth = frameElt->getMarginWidth();
 274         int marginHeight = frameElt->getMarginHeight();
 275         if (marginWidth != -1)
 276             setMarginWidth(marginWidth);
 277         if (marginHeight != -1)
 278             setMarginHeight(marginHeight);
 279     }
 280 }
 281
 282 void FrameView::detachCustomScrollbars()
 283 {
 284     if (!m_frame)
 285         return;
 286
 287     Scrollbar* horizontalBar = horizontalScrollbar();
 288     if (horizontalBar && horizontalBar->isCustomScrollbar())
 289         setHasHorizontalScrollbar(false);
 290
 291     Scrollbar* verticalBar = verticalScrollbar();
 292     if (verticalBar && verticalBar->isCustomScrollbar())
 293         setHasVerticalScrollbar(false);
 294
 295     if (m_scrollCorner) {
 296         m_scrollCorner->destroy();
 297         m_scrollCorner = 0;
 298     }
 299 }
 300
 301 void FrameView::clear()
 302 {
 303     setCanBlitOnScroll(true);
 304
 305     reset();
 306
 307     if (m_frame) {
 308         if (RenderPart* renderer = m_frame->ownerRenderer())
 309             renderer->viewCleared();
 310     }
 311
 312     setScrollbarsSuppressed(true);
 313 }
 314
 315 bool FrameView::didFirstLayout() const
 316 {
 317     return !m_firstLayout;
 318 }
 319
 320 void FrameView::invalidateRect(const IntRect& rect)
 321 {
 322     if (!parent()) {
 323         if (hostWindow())
 324             hostWindow()->invalidateContentsAndWindow(rect, false /*immediate*/);
 325         return;
 326     }
 327
 328     if (!m_frame)
 329         return;
 330
 331     RenderPart* renderer = m_frame->ownerRenderer();
 332     if (!renderer)
 333         return;
 334
 335     IntRect repaintRect = rect;
 336     repaintRect.move(renderer->borderLeft() + renderer->paddingLeft(),
 337                      renderer->borderTop() + renderer->paddingTop());
 338     renderer->repaintRectangle(repaintRect);
 339 }
 340
 341 void FrameView::setFrameRect(const IntRect& newRect)
 342 {
 343     IntRect oldRect = frameRect();
 344     if (newRect == oldRect)
 345         return;
 346
 347     ScrollView::setFrameRect(newRect);
 348
 349 #if USE(ACCELERATED_COMPOSITING)
 350     if (RenderView* root = m_frame->contentRenderer()) {
 351         if (root->usesCompositing())
 352             root->compositor()->frameViewDidChangeSize();
 353     }
 354 #endif
 355 }
 356
 357 void FrameView::setMarginWidth(int w)
 358 {
 359     // make it update the rendering area when set
 360     m_margins.setWidth(w);
 361 }
 362
 363 void FrameView::setMarginHeight(int h)
 364 {
 365     // make it update the rendering area when set
 366     m_margins.setHeight(h);
 367 }
 368
 369 bool FrameView::avoidScrollbarCreation()
 370 {
 371     ASSERT(m_frame);
 372
 373     // with frame flattening no subframe can have scrollbars
 374     // but we also cannot turn scrollbars of as we determine
 375     // our flattening policy using that.
 376
 377     if (!m_frame->ownerElement())
 378         return false;
 379
 380     if (!m_frame->settings() || m_frame->settings()->frameFlatteningEnabled())
 381         return true;
 382
 383     return false;
 384 }
 385
 386 void FrameView::setCanHaveScrollbars(bool canHaveScrollbars)
 387 {
 388     m_canHaveScrollbars = canHaveScrollbars;
 389     ScrollView::setCanHaveScrollbars(canHaveScrollbars);
 390 }
 391
 392 void FrameView::updateCanHaveScrollbars()
 393 {
 394     ScrollbarMode hMode;
 395     ScrollbarMode vMode;
 396     scrollbarModes(hMode, vMode);
 397     if (hMode == ScrollbarAlwaysOff && vMode == ScrollbarAlwaysOff)
 398         m_canHaveScrollbars = false;
 399     else
 400         m_canHaveScrollbars = true;
 401 }
 402
 403 PassRefPtr<Scrollbar> FrameView::createScrollbar(ScrollbarOrientation orientation)
 404 {
 405     // FIXME: We need to update the scrollbar dynamically as documents change (or as doc elements and bodies get discovered that have custom styles).
 406     Document* doc = m_frame->document();
 407
 408     // Try the <body> element first as a scrollbar source.
 409     Element* body = doc ? doc->body() : 0;
 410     if (body && body->renderer() && body->renderer()->style()->hasPseudoStyle(SCROLLBAR))
 411         return RenderScrollbar::createCustomScrollbar(this, orientation, body->renderer()->enclosingBox());
 412
 413     // If the <body> didn't have a custom style, then the root element might.
 414     Element* docElement = doc ? doc->documentElement() : 0;
 415     if (docElement && docElement->renderer() && docElement->renderer()->style()->hasPseudoStyle(SCROLLBAR))
 416         return RenderScrollbar::createCustomScrollbar(this, orientation, docElement->renderBox());
 417
 418     // If we have an owning iframe/frame element, then it can set the custom scrollbar also.
 419     RenderPart* frameRenderer = m_frame->ownerRenderer();
 420     if (frameRenderer && frameRenderer->style()->hasPseudoStyle(SCROLLBAR))
 421         return RenderScrollbar::createCustomScrollbar(this, orientation, 0, m_frame.get());
 422
 423     // Nobody set a custom style, so we just use a native scrollbar.
 424     return ScrollView::createScrollbar(orientation);
 425 }
 426
 427 void FrameView::setContentsSize(const IntSize& size)
 428 {
 429     if (size == contentsSize())
 430         return;
 431
 432     m_deferSetNeedsLayouts++;
 433
 434     ScrollView::setContentsSize(size);
 435
 436     Page* page = frame() ? frame()->page() : 0;
 437     if (!page)
 438         return;
 439
 440     page->chrome()->contentsSizeChanged(frame(), size); //notify only
 441
 442     m_deferSetNeedsLayouts--;
 443
 444     if (!m_deferSetNeedsLayouts)
 445         m_setNeedsLayoutWasDeferred = false; // FIXME: Find a way to make the deferred layout actually happen.
 446 }
 447
 448 void FrameView::adjustViewSize()
 449 {
 450     ASSERT(m_frame->view() == this);
 451     RenderView* root = m_frame->contentRenderer();
 452     if (!root)
 453         return;
 454
 455     setContentsSize(IntSize(root->rightLayoutOverflow(), root->bottomLayoutOverflow()));
 456 }
 457
 458 void FrameView::applyOverflowToViewport(RenderObject* o, ScrollbarMode& hMode, ScrollbarMode& vMode)
 459 {
 460     // Handle the overflow:hidden/scroll case for the body/html elements.  WinIE treats
 461     // overflow:hidden and overflow:scroll on <body> as applying to the document's
 462     // scrollbars.  The CSS2.1 draft states that HTML UAs should use the <html> or <body> element and XML/XHTML UAs should
 463     // use the root element.
 464     switch (o->style()->overflowX()) {
 465         case OHIDDEN:
 466             hMode = ScrollbarAlwaysOff;
 467             break;
 468         case OSCROLL:
 469             hMode = ScrollbarAlwaysOn;
 470             break;
 471         case OAUTO:
 472             hMode = ScrollbarAuto;
 473             break;
 474         default:
 475             // Don't set it at all.
 476             ;
 477     }
 478
 479      switch (o->style()->overflowY()) {
 480         case OHIDDEN:
 481             vMode = ScrollbarAlwaysOff;
 482             break;
 483         case OSCROLL:
 484             vMode = ScrollbarAlwaysOn;
 485             break;
 486         case OAUTO:
 487             vMode = ScrollbarAuto;
 488             break;
 489         default:
 490             // Don't set it at all.
 491             ;
 492     }
 493
 494     m_viewportRenderer = o;
 495 }
 496
 497 #if USE(ACCELERATED_COMPOSITING)
 498 void FrameView::updateCompositingLayers()
 499 {
 500     RenderView* view = m_frame->contentRenderer();
 501     if (!view)
 502         return;
 503
 504     // This call will make sure the cached hasAcceleratedCompositing is updated from the pref
 505     view->compositor()->cacheAcceleratedCompositingFlags();
 506     view->compositor()->updateCompositingLayers(CompositingUpdateAfterLayoutOrStyleChange);
 507 }
 508
 509 void FrameView::setNeedsOneShotDrawingSynchronization()
 510 {
 511     Page* page = frame() ? frame()->page() : 0;
 512     if (page)
 513         page->chrome()->client()->setNeedsOneShotDrawingSynchronization();
 514 }
 515
 516 #endif // USE(ACCELERATED_COMPOSITING)
 517
 518 bool FrameView::hasCompositedContent() const
 519 {
 520 #if USE(ACCELERATED_COMPOSITING)
 521     if (RenderView* view = m_frame->contentRenderer())
 522         return view->compositor()->inCompositingMode();
 523 #endif
 524     return false;
 525 }
 526
 527 // Sometimes (for plug-ins) we need to eagerly go into compositing mode.
 528 void FrameView::enterCompositingMode()
 529 {
 530 #if USE(ACCELERATED_COMPOSITING)
 531     if (RenderView* view = m_frame->contentRenderer())
 532         view->compositor()->enableCompositingMode();
 533 #endif
 534 }
 535
 536 bool FrameView::isEnclosedInCompositingLayer() const
 537 {
 538 #if USE(ACCELERATED_COMPOSITING)
 539     RenderObject* frameOwnerRenderer = m_frame->ownerRenderer();
 540     return frameOwnerRenderer && frameOwnerRenderer->containerForRepaint();
 541 #else
 542     return false;
 543 #endif
 544 }
 545
 546 bool FrameView::syncCompositingStateRecursive()
 547 {
 548 #if USE(ACCELERATED_COMPOSITING)
 549     ASSERT(m_frame->view() == this);
 550     RenderView* contentRenderer = m_frame->contentRenderer();
 551     if (!contentRenderer)
 552         return true;    // We don't want to keep trying to update layers if we have no renderer.
 553
 554     // If we sync compositing layers when a layout is pending, we may cause painting of compositing
 555     // layer content to occur before layout has happened, which will cause paintContents() to bail.
 556     if (needsLayout())
 557         return false;
 558
 559     if (GraphicsLayer* rootLayer = contentRenderer->compositor()->rootPlatformLayer())
 560         rootLayer->syncCompositingState();
 561
 562     bool allSubframesSynced = true;
 563     const HashSet<RefPtr<Widget> >* viewChildren = children();
 564     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
 565     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
 566         Widget* widget = (*current).get();
 567         if (widget->isFrameView()) {
 568             bool synced = static_cast<FrameView*>(widget)->syncCompositingStateRecursive();
 569             allSubframesSynced &= synced;
 570         }
 571     }
 572     return allSubframesSynced;
 573 #else // USE(ACCELERATED_COMPOSITING)
 574     return true;
 575 #endif
 576 }
 577
 578 bool FrameView::isSoftwareRenderable() const
 579 {
 580 #if USE(ACCELERATED_COMPOSITING)
 581     RenderView* view = m_frame->contentRenderer();
 582     if (!view)
 583         return true;
 584
 585     return !view->compositor()->has3DContent();
 586 #else
 587     return true;
 588 #endif
 589 }
 590
 591 void FrameView::didMoveOnscreen()
 592 {
 593     RenderView* view = m_frame->contentRenderer();
 594     if (view)
 595         view->didMoveOnscreen();
 596 }
 597
 598 void FrameView::willMoveOffscreen()
 599 {
 600     RenderView* view = m_frame->contentRenderer();
 601     if (view)
 602         view->willMoveOffscreen();
 603 }
 604
 605 RenderObject* FrameView::layoutRoot(bool onlyDuringLayout) const
 606 {
 607     return onlyDuringLayout && layoutPending() ? 0 : m_layoutRoot;
 608 }
 609
 610 void FrameView::layout(bool allowSubtree)
 611 {
 612     if (m_inLayout)
 613         return;
 614
 615     m_layoutTimer.stop();
 616     m_delayedLayout = false;
 617     m_setNeedsLayoutWasDeferred = false;
 618
 619     // Protect the view from being deleted during layout (in recalcStyle)
 620     RefPtr<FrameView> protector(this);
 621
 622     if (!m_frame) {
 623         // FIXME: Do we need to set m_size.width here?
 624         // FIXME: Should we set m_size.height here too?
 625         m_size.setWidth(layoutWidth());
 626         return;
 627     }
 628
 629     // we shouldn't enter layout() while painting
 630     ASSERT(!isPainting());
 631     if (isPainting())
 632         return;
 633
 634 #if ENABLE(INSPECTOR)
 635     if (InspectorTimelineAgent* timelineAgent = inspectorTimelineAgent())
 636         timelineAgent->willLayout();
 637 #endif
 638
 639     if (!allowSubtree && m_layoutRoot) {
 640         m_layoutRoot->markContainingBlocksForLayout(false);
 641         m_layoutRoot = 0;
 642     }
 643
 644     ASSERT(m_frame->view() == this);
 645
 646     Document* document = m_frame->document();
 647
 648     m_layoutSchedulingEnabled = false;
 649
 650     if (!m_nestedLayoutCount && m_postLayoutTasksTimer.isActive()) {
 651         // This is a new top-level layout. If there are any remaining tasks from the previous
 652         // layout, finish them now.
 653         m_postLayoutTasksTimer.stop();
 654         performPostLayoutTasks();
 655     }
 656
 657     // Viewport-dependent media queries may cause us to need completely different style information.
 658     // Check that here.
 659     if (document->styleSelector()->affectedByViewportChange())
 660         document->updateStyleSelector();
 661
 662     // Always ensure our style info is up-to-date.  This can happen in situations where
 663     // the layout beats any sort of style recalc update that needs to occur.
 664     if (m_frame->needsReapplyStyles())
 665         m_frame->reapplyStyles();
 666     else if (document->childNeedsStyleRecalc())
 667         document->recalcStyle();
 668
 669     bool subtree = m_layoutRoot;
 670
 671     // If there is only one ref to this view left, then its going to be destroyed as soon as we exit,
 672     // so there's no point to continuing to layout
 673     if (protector->hasOneRef())
 674         return;
 675
 676     RenderObject* root = subtree ? m_layoutRoot : document->renderer();
 677     if (!root) {
 678         // FIXME: Do we need to set m_size here?
 679         m_layoutSchedulingEnabled = true;
 680         return;
 681     }
 682
 683 #ifdef ANDROID_INSTRUMENT
 684     if (!m_frame->tree() || !m_frame->tree()->parent())
 685         android::TimeCounter::start(android::TimeCounter::LayoutTimeCounter);
 686 #endif
 687
 688     m_nestedLayoutCount++;
 689
 690     ScrollbarMode hMode;
 691     ScrollbarMode vMode;
 692     if (m_canHaveScrollbars) {
 693         hMode = ScrollbarAuto;
 694         vMode = ScrollbarAuto;
 695     } else {
 696         hMode = ScrollbarAlwaysOff;
 697         vMode = ScrollbarAlwaysOff;
 698     }
 699
 700     if (!subtree) {
 701         Node* documentElement = document->documentElement();
 702         RenderObject* rootRenderer = documentElement ? documentElement->renderer() : 0;
 703         Node* body = document->body();
 704         if (body && body->renderer()) {
 705             if (body->hasTagName(framesetTag) && m_frame->settings() && !m_frame->settings()->frameFlatteningEnabled()) {
 706 #if !defined(ANDROID_FLATTEN_IFRAME) && !defined(ANDROID_FLATTEN_FRAMESET)
 707                 body->renderer()->setChildNeedsLayout(true);
 708                 vMode = ScrollbarAlwaysOff;
 709                 hMode = ScrollbarAlwaysOff;
 710 #endif
 711             } else if (body->hasTagName(bodyTag)) {
 712                 if (!m_firstLayout && m_size.height() != layoutHeight() && body->renderer()->enclosingBox()->stretchesToViewHeight())
 713                     body->renderer()->setChildNeedsLayout(true);
 714                 // It's sufficient to just check the X overflow,
 715                 // since it's illegal to have visible in only one direction.
 716                 RenderObject* o = rootRenderer->style()->overflowX() == OVISIBLE && document->documentElement()->hasTagName(htmlTag) ? body->renderer() : rootRenderer;
 717                 applyOverflowToViewport(o, hMode, vMode);
 718             }
 719         } else if (rootRenderer) {
 720 #if ENABLE(SVG)
 721             if (documentElement->isSVGElement()) {
 722                 if (!m_firstLayout && (m_size.width() != layoutWidth() || m_size.height() != layoutHeight()))
 723                     rootRenderer->setChildNeedsLayout(true);
 724             } else
 725                 applyOverflowToViewport(rootRenderer, hMode, vMode);
 726 #else
 727             applyOverflowToViewport(rootRenderer, hMode, vMode);
 728 #endif
 729         }
 730 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
 731         if (m_firstLayout && !document->ownerElement())
 732             printf("Elapsed time before first layout: %d\n", document->elapsedTime());
 733 #endif
 734     }
 735
 736     m_doFullRepaint = !subtree && (m_firstLayout || toRenderView(root)->printing());
 737
 738     if (!subtree) {
 739         // Now set our scrollbar state for the layout.
 740         ScrollbarMode currentHMode = horizontalScrollbarMode();
 741         ScrollbarMode currentVMode = verticalScrollbarMode();
 742
 743         if (m_firstLayout || (hMode != currentHMode || vMode != currentVMode)) {
 744             if (m_firstLayout) {
 745                 setScrollbarsSuppressed(true);
 746
 747                 m_firstLayout = false;
 748                 m_firstLayoutCallbackPending = true;
 749                 m_lastLayoutSize = IntSize(width(), height());
 750                 m_lastZoomFactor = root->style()->zoom();
 751
 752                 // Set the initial vMode to AlwaysOn if we're auto.
 753                 if (vMode == ScrollbarAuto)
 754                     setVerticalScrollbarMode(ScrollbarAlwaysOn); // This causes a vertical scrollbar to appear.
 755                 // Set the initial hMode to AlwaysOff if we're auto.
 756                 if (hMode == ScrollbarAuto)
 757                     setHorizontalScrollbarMode(ScrollbarAlwaysOff); // This causes a horizontal scrollbar to disappear.
 758
 759                 setScrollbarModes(hMode, vMode);
 760                 setScrollbarsSuppressed(false, true);
 761             } else
 762                 setScrollbarModes(hMode, vMode);
 763         }
 764
 765         IntSize oldSize = m_size;
 766
 767         m_size = IntSize(layoutWidth(), layoutHeight());
 768
 769         if (oldSize != m_size)
 770             m_doFullRepaint = true;
 771     }
 772
 773     RenderLayer* layer = root->enclosingLayer();
 774
 775     pauseScheduledEvents();
 776
 777     bool disableLayoutState = false;
 778     if (subtree) {
 779         RenderView* view = root->view();
 780         disableLayoutState = view->shouldDisableLayoutStateForSubtree(root);
 781         view->pushLayoutState(root);
 782         if (disableLayoutState)
 783             view->disableLayoutState();
 784     }
 785
 786     m_inLayout = true;
 787     beginDeferredRepaints();
 788     root->layout();
 789     endDeferredRepaints();
 790     m_inLayout = false;
 791
 792     if (subtree) {
 793         RenderView* view = root->view();
 794         view->popLayoutState();
 795         if (disableLayoutState)
 796             view->enableLayoutState();
 797     }
 798     m_layoutRoot = 0;
 799
 800     m_frame->selection()->setCaretRectNeedsUpdate();
 801     m_frame->selection()->updateAppearance();
 802
 803     m_layoutSchedulingEnabled = true;
 804
 805     if (!subtree && !toRenderView(root)->printing())
 806         adjustViewSize();
 807
 808     // Now update the positions of all layers.
 809     beginDeferredRepaints();
 810     IntPoint cachedOffset;
 811     layer->updateLayerPositions((m_doFullRepaint ? RenderLayer::DoFullRepaint : 0)
 812                                 | RenderLayer::CheckForRepaint
 813                                 | RenderLayer::IsCompositingUpdateRoot
 814                                 | RenderLayer::UpdateCompositingLayers,
 815                                 subtree ? 0 : &cachedOffset);
 816     endDeferredRepaints();
 817
 818 #if USE(ACCELERATED_COMPOSITING)
 819     updateCompositingLayers();
 820 #endif
 821
 822     m_layoutCount++;
 823
 824 #if PLATFORM(MAC)
 825     if (AXObjectCache::accessibilityEnabled())
 826         root->document()->axObjectCache()->postNotification(root, AXObjectCache::AXLayoutComplete, true);
 827 #endif
 828 #if ENABLE(DASHBOARD_SUPPORT)
 829     updateDashboardRegions();
 830 #endif
 831
 832 #ifdef ANDROID_INSTRUMENT
 833     if (!m_frame->tree()->parent())
 834         android::TimeCounter::record(android::TimeCounter::LayoutTimeCounter, __FUNCTION__);
 835 #endif
 836     ASSERT(!root->needsLayout());
 837
 838     setCanBlitOnScroll(!useSlowRepaints());
 839
 840     if (document->hasListenerType(Document::OVERFLOWCHANGED_LISTENER))
 841         updateOverflowStatus(layoutWidth() < contentsWidth(),
 842                              layoutHeight() < contentsHeight());
 843
 844     if (!m_postLayoutTasksTimer.isActive()) {
 845         // Calls resumeScheduledEvents()
 846         performPostLayoutTasks();
 847
 848         if (!m_postLayoutTasksTimer.isActive() && needsLayout()) {
 849             // Post-layout widget updates or an event handler made us need layout again.
 850             // Lay out again, but this time defer widget updates and event dispatch until after
 851             // we return.
 852             m_postLayoutTasksTimer.startOneShot(0);
 853             pauseScheduledEvents();
 854             layout();
 855         }
 856     } else {
 857         resumeScheduledEvents();
 858         ASSERT(m_enqueueEvents);
 859     }
 860
 861 #if ENABLE(INSPECTOR)
 862     if (InspectorTimelineAgent* timelineAgent = inspectorTimelineAgent())
 863         timelineAgent->didLayout();
 864 #endif
 865
 866     m_nestedLayoutCount--;
 867 }
 868
 869 void FrameView::addWidgetToUpdate(RenderEmbeddedObject* object)
 870 {
 871     if (!m_widgetUpdateSet)
 872         m_widgetUpdateSet.set(new RenderEmbeddedObjectSet);
 873
 874     m_widgetUpdateSet->add(object);
 875 }
 876
 877 void FrameView::removeWidgetToUpdate(RenderEmbeddedObject* object)
 878 {
 879     if (!m_widgetUpdateSet)
 880         return;
 881
 882     m_widgetUpdateSet->remove(object);
 883 }
 884
 885 void FrameView::setMediaType(const String& mediaType)
 886 {
 887     m_mediaType = mediaType;
 888 }
 889
 890 String FrameView::mediaType() const
 891 {
 892     // See if we have an override type.
 893     String overrideType = m_frame->loader()->client()->overrideMediaType();
 894     if (!overrideType.isNull())
 895         return overrideType;
 896     return m_mediaType;
 897 }
 898
 899 void FrameView::adjustMediaTypeForPrinting(bool printing)
 900 {
 901     if (printing) {
 902         if (m_mediaTypeWhenNotPrinting.isNull())
 903             m_mediaTypeWhenNotPrinting = mediaType();
 904             setMediaType("print");
 905     } else {
 906         if (!m_mediaTypeWhenNotPrinting.isNull())
 907             setMediaType(m_mediaTypeWhenNotPrinting);
 908         m_mediaTypeWhenNotPrinting = String();
 909     }
 910 }
 911
 912 bool FrameView::useSlowRepaints() const
 913 {
 914     return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || (platformWidget() && m_fixedObjectCount > 0) || m_isOverlapped || !m_contentIsOpaque;
 915 }
 916
 917 bool FrameView::useSlowRepaintsIfNotOverlapped() const
 918 {
 919     return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || (platformWidget() && m_fixedObjectCount > 0) || !m_contentIsOpaque;
 920 }
 921
 922 void FrameView::setUseSlowRepaints()
 923 {
 924     m_useSlowRepaints = true;
 925     setCanBlitOnScroll(false);
 926 }
 927
 928 void FrameView::addSlowRepaintObject()
 929 {
 930     if (!m_slowRepaintObjectCount)
 931         setCanBlitOnScroll(false);
 932     m_slowRepaintObjectCount++;
 933 }
 934
 935 void FrameView::removeSlowRepaintObject()
 936 {
 937     ASSERT(m_slowRepaintObjectCount > 0);
 938     m_slowRepaintObjectCount--;
 939     if (!m_slowRepaintObjectCount)
 940         setCanBlitOnScroll(!useSlowRepaints());
 941 }
 942
 943 void FrameView::addFixedObject()
 944 {
 945     if (!m_fixedObjectCount && platformWidget())
 946         setCanBlitOnScroll(false);
 947     ++m_fixedObjectCount;
 948 }
 949
 950 void FrameView::removeFixedObject()
 951 {
 952     ASSERT(m_fixedObjectCount > 0);
 953     --m_fixedObjectCount;
 954     if (!m_fixedObjectCount)
 955         setCanBlitOnScroll(!useSlowRepaints());
 956 }
 957
 958 bool FrameView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
 959 {
 960     const size_t fixedObjectThreshold = 5;
 961
 962     RenderBlock::PositionedObjectsListHashSet* positionedObjects = 0;
 963     if (RenderView* root = m_frame->contentRenderer())
 964         positionedObjects = root->positionedObjects();
 965
 966     if (!positionedObjects || positionedObjects->isEmpty()) {
 967         hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
 968         return true;
 969     }
 970
 971     // Get the rects of the fixed objects visible in the rectToScroll
 972     Vector<IntRect, fixedObjectThreshold> subRectToUpdate;
 973     bool updateInvalidatedSubRect = true;
 974     RenderBlock::PositionedObjectsListHashSet::const_iterator end = positionedObjects->end();
 975     for (RenderBlock::PositionedObjectsListHashSet::const_iterator it = positionedObjects->begin(); it != end; ++it) {
 976         RenderBox* renderBox = *it;
 977         if (renderBox->style()->position() != FixedPosition)
 978             continue;
 979         IntRect updateRect = renderBox->layer()->repaintRectIncludingDescendants();
 980         updateRect = contentsToWindow(updateRect);
 981
 982         updateRect.intersect(rectToScroll);
 983         if (!updateRect.isEmpty()) {
 984             if (subRectToUpdate.size() >= fixedObjectThreshold) {
 985                 updateInvalidatedSubRect = false;
 986                 break;
 987             }
 988             subRectToUpdate.append(updateRect);
 989         }
 990     }
 991
 992     // Scroll the view
 993     if (updateInvalidatedSubRect) {
 994         // 1) scroll
 995         hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
 996
 997         // 2) update the area of fixed objects that has been invalidated
 998         size_t fixObjectsCount = subRectToUpdate.size();
 999         for (size_t i = 0; i < fixObjectsCount; ++i) {
1000             IntRect updateRect = subRectToUpdate[i];
1001             IntRect scrolledRect = updateRect;
1002             scrolledRect.move(scrollDelta);
1003             updateRect.unite(scrolledRect);
1004             updateRect.intersect(rectToScroll);
1005             hostWindow()->invalidateContentsAndWindow(updateRect, false);
1006         }
1007         return true;
1008     }
1009
1010     // the number of fixed objects exceed the threshold, we cannot use the fast path
1011     return false;
1012 }
1013
1014 // Note that this gets called at painting time.
1015 void FrameView::setIsOverlapped(bool isOverlapped)
1016 {
1017     if (isOverlapped == m_isOverlapped)
1018         return;
1019
1020     m_isOverlapped = isOverlapped;
1021     setCanBlitOnScroll(!useSlowRepaints());
1022
1023 #if USE(ACCELERATED_COMPOSITING)
1024     // Overlap can affect compositing tests, so if it changes, we need to trigger
1025     // a layer update in the parent document.
1026     if (hasCompositedContent()) {
1027         if (Frame* parentFrame = m_frame->tree()->parent()) {
1028             if (RenderView* parentView = parentFrame->contentRenderer()) {
1029                 RenderLayerCompositor* compositor = parentView->compositor();
1030                 compositor->setCompositingLayersNeedRebuild();
1031                 compositor->scheduleCompositingLayerUpdate();
1032             }
1033         }
1034     }
1035 #endif
1036 }
1037
1038 void FrameView::setContentIsOpaque(bool contentIsOpaque)
1039 {
1040     if (contentIsOpaque == m_contentIsOpaque)
1041         return;
1042
1043     m_contentIsOpaque = contentIsOpaque;
1044     setCanBlitOnScroll(!useSlowRepaints());
1045 }
1046
1047 void FrameView::restoreScrollbar()
1048 {
1049     setScrollbarsSuppressed(false);
1050 }
1051
1052 bool FrameView::scrollToFragment(const KURL& url)
1053 {
1054     // If our URL has no ref, then we have no place we need to jump to.
1055     // OTOH If CSS target was set previously, we want to set it to 0, recalc
1056     // and possibly repaint because :target pseudo class may have been
1057     // set (see bug 11321).
1058     if (!url.hasFragmentIdentifier() && !m_frame->document()->cssTarget())
1059         return false;
1060
1061     String fragmentIdentifier = url.fragmentIdentifier();
1062     if (scrollToAnchor(fragmentIdentifier))
1063         return true;
1064
1065     // Try again after decoding the ref, based on the document's encoding.
1066     if (TextResourceDecoder* decoder = m_frame->document()->decoder())
1067         return scrollToAnchor(decodeURLEscapeSequences(fragmentIdentifier, decoder->encoding()));
1068
1069     return false;
1070 }
1071
1072 bool FrameView::scrollToAnchor(const String& name)
1073 {
1074     ASSERT(m_frame->document());
1075
1076     if (!m_frame->document()->haveStylesheetsLoaded()) {
1077         m_frame->document()->setGotoAnchorNeededAfterStylesheetsLoad(true);
1078         return false;
1079     }
1080
1081     m_frame->document()->setGotoAnchorNeededAfterStylesheetsLoad(false);
1082
1083     Element* anchorNode = m_frame->document()->findAnchor(name);
1084
1085 #if ENABLE(SVG)
1086     if (m_frame->document()->isSVGDocument()) {
1087         if (name.startsWith("xpointer(")) {
1088             // We need to parse the xpointer reference here
1089         } else if (name.startsWith("svgView(")) {
1090             RefPtr<SVGSVGElement> svg = static_cast<SVGDocument*>(m_frame->document())->rootElement();
1091             if (!svg->currentView()->parseViewSpec(name))
1092                 return false;
1093             svg->setUseCurrentView(true);
1094         } else {
1095             if (anchorNode && anchorNode->hasTagName(SVGNames::viewTag)) {
1096                 RefPtr<SVGViewElement> viewElement = anchorNode->hasTagName(SVGNames::viewTag) ? static_cast<SVGViewElement*>(anchorNode) : 0;
1097                 if (viewElement.get()) {
1098                     RefPtr<SVGSVGElement> svg = static_cast<SVGSVGElement*>(SVGLocatable::nearestViewportElement(viewElement.get()));
1099                     svg->inheritViewAttributes(viewElement.get());
1100                 }
1101             }
1102         }
1103         // FIXME: need to decide which <svg> to focus on, and zoom to that one
1104         // FIXME: need to actually "highlight" the viewTarget(s)
1105     }
1106 #endif
1107
1108     m_frame->document()->setCSSTarget(anchorNode); // Setting to null will clear the current target.
1109
1110     // Implement the rule that "" and "top" both mean top of page as in other browsers.
1111     if (!anchorNode && !(name.isEmpty() || equalIgnoringCase(name, "top")))
1112         return false;
1113
1114 #ifdef ANDROID_SCROLL_ON_GOTO_ANCHOR
1115     // TODO(andreip): check with Grace if this is correct.
1116     android::WebFrame::getWebFrame(m_frame.get())->setUserInitiatedClick(true);
1117 #endif
1118     maintainScrollPositionAtAnchor(anchorNode ? static_cast<Node*>(anchorNode) : m_frame->document());
1119 #ifdef ANDROID_SCROLL_ON_GOTO_ANCHOR
1120     android::WebFrame::getWebFrame(m_frame.get())->setUserInitiatedClick(false);
1121 #endif
1122     return true;
1123 }
1124
1125 void FrameView::maintainScrollPositionAtAnchor(Node* anchorNode)
1126 {
1127     m_maintainScrollPositionAnchor = anchorNode;
1128     if (!m_maintainScrollPositionAnchor)
1129         return;
1130
1131     // We need to update the layout before scrolling, otherwise we could
1132     // really mess things up if an anchor scroll comes at a bad moment.
1133     m_frame->document()->updateStyleIfNeeded();
1134     // Only do a layout if changes have occurred that make it necessary.
1135     if (m_frame->contentRenderer() && m_frame->contentRenderer()->needsLayout())
1136         layout();
1137     else
1138         scrollToAnchor();
1139 }
1140
1141 void FrameView::setScrollPosition(const IntPoint& scrollPoint)
1142 {
1143     bool wasInProgrammaticScroll = m_inProgrammaticScroll;
1144     m_inProgrammaticScroll = true;
1145     m_maintainScrollPositionAnchor = 0;
1146     ScrollView::setScrollPosition(scrollPoint);
1147     m_inProgrammaticScroll = wasInProgrammaticScroll;
1148 }
1149
1150 void FrameView::scrollPositionChangedViaPlatformWidget()
1151 {
1152     repaintFixedElementsAfterScrolling();
1153     scrollPositionChanged();
1154 }
1155
1156 void FrameView::scrollPositionChanged()
1157 {
1158     frame()->eventHandler()->sendScrollEvent();
1159
1160 #if USE(ACCELERATED_COMPOSITING)
1161     if (RenderView* root = m_frame->contentRenderer()) {
1162         if (root->usesCompositing())
1163             root->compositor()->frameViewDidScroll(scrollPosition());
1164     }
1165 #endif
1166 }
1167
1168 void FrameView::repaintFixedElementsAfterScrolling()
1169 {
1170     // For fixed position elements, update widget positions and compositing layers after scrolling,
1171     // but only if we're not inside of layout.
1172     if (!m_nestedLayoutCount && hasFixedObjects()) {
1173         if (RenderView* root = m_frame->contentRenderer()) {
1174             root->updateWidgetPositions();
1175             root->layer()->updateRepaintRectsAfterScroll();
1176 #if USE(ACCELERATED_COMPOSITING)
1177             root->compositor()->updateCompositingLayers(CompositingUpdateOnScroll);
1178 #endif
1179         }
1180     }
1181 }
1182
1183 HostWindow* FrameView::hostWindow() const
1184 {
1185     Page* page = frame() ? frame()->page() : 0;
1186     if (!page)
1187         return 0;
1188     return page->chrome();
1189 }
1190
1191 const unsigned cRepaintRectUnionThreshold = 25;
1192
1193 void FrameView::repaintContentRectangle(const IntRect& r, bool immediate)
1194 {
1195     ASSERT(!m_frame->document()->ownerElement());
1196
1197     double delay = adjustedDeferredRepaintDelay();
1198     if ((m_deferringRepaints || m_deferredRepaintTimer.isActive() || delay) && !immediate) {
1199         IntRect paintRect = r;
1200         if (!paintsEntireContents())
1201             paintRect.intersect(visibleContentRect());
1202 #ifdef ANDROID_CAPTURE_OFFSCREEN_PAINTS
1203         if (r != paintRect)
1204             ScrollView::platformOffscreenContentRectangle(visibleContentRect(), r);
1205 #endif
1206         if (paintRect.isEmpty())
1207             return;
1208         if (m_repaintCount == cRepaintRectUnionThreshold) {
1209             IntRect unionedRect;
1210             for (unsigned i = 0; i < cRepaintRectUnionThreshold; ++i)
1211                 unionedRect.unite(m_repaintRects[i]);
1212             m_repaintRects.clear();
1213             m_repaintRects.append(unionedRect);
1214         }
1215         if (m_repaintCount < cRepaintRectUnionThreshold)
1216             m_repaintRects.append(paintRect);
1217         else
1218             m_repaintRects[0].unite(paintRect);
1219         m_repaintCount++;
1220
1221         if (!m_deferringRepaints && !m_deferredRepaintTimer.isActive())
1222              m_deferredRepaintTimer.startOneShot(delay);
1223         return;
1224     }
1225
1226     if (!immediate && isOffscreen() && !shouldUpdateWhileOffscreen())
1227         return;
1228
1229 #if ENABLE(TILED_BACKING_STORE)
1230     if (frame()->tiledBackingStore()) {
1231         frame()->tiledBackingStore()->invalidate(r);
1232         return;
1233     }
1234 #endif
1235     ScrollView::repaintContentRectangle(r, immediate);
1236 }
1237
1238 void FrameView::visibleContentsResized()
1239 {
1240     // We check to make sure the view is attached to a frame() as this method can
1241     // be triggered before the view is attached by Frame::createView(...) setting
1242     // various values such as setScrollBarModes(...) for example.  An ASSERT is
1243     // triggered when a view is layout before being attached to a frame().
1244     if (!frame()->view())
1245         return;
1246
1247     if (needsLayout())
1248         layout();
1249 }
1250
1251 void FrameView::beginDeferredRepaints()
1252 {
1253     Page* page = m_frame->page();
1254     if (page->mainFrame() != m_frame)
1255         return page->mainFrame()->view()->beginDeferredRepaints();
1256
1257     m_deferringRepaints++;
1258 }
1259
1260
1261 void FrameView::endDeferredRepaints()
1262 {
1263     Page* page = m_frame->page();
1264     if (page->mainFrame() != m_frame)
1265         return page->mainFrame()->view()->endDeferredRepaints();
1266
1267     ASSERT(m_deferringRepaints > 0);
1268
1269     if (--m_deferringRepaints)
1270         return;
1271
1272     if (m_deferredRepaintTimer.isActive())
1273         return;
1274
1275     if (double delay = adjustedDeferredRepaintDelay()) {
1276         m_deferredRepaintTimer.startOneShot(delay);
1277         return;
1278     }
1279
1280     doDeferredRepaints();
1281 }
1282
1283 void FrameView::checkStopDelayingDeferredRepaints()
1284 {
1285     if (!m_deferredRepaintTimer.isActive())
1286         return;
1287
1288     Document* document = m_frame->document();
1289     if (document && (document->parsing() || document->docLoader()->requestCount()))
1290         return;
1291
1292     m_deferredRepaintTimer.stop();
1293
1294     doDeferredRepaints();
1295 }
1296
1297 void FrameView::doDeferredRepaints()
1298 {
1299     ASSERT(!m_deferringRepaints);
1300     if (isOffscreen() && !shouldUpdateWhileOffscreen()) {
1301         m_repaintRects.clear();
1302         m_repaintCount = 0;
1303         return;
1304     }
1305     unsigned size = m_repaintRects.size();
1306     for (unsigned i = 0; i < size; i++) {
1307 #if ENABLE(TILED_BACKING_STORE)
1308         if (frame()->tiledBackingStore()) {
1309             frame()->tiledBackingStore()->invalidate(m_repaintRects[i]);
1310             continue;
1311         }
1312 #endif
1313         ScrollView::repaintContentRectangle(m_repaintRects[i], false);
1314     }
1315     m_repaintRects.clear();
1316     m_repaintCount = 0;
1317
1318     updateDeferredRepaintDelay();
1319 }
1320
1321 void FrameView::updateDeferredRepaintDelay()
1322 {
1323     Document* document = m_frame->document();
1324     if (!document || (!document->parsing() && !document->docLoader()->requestCount())) {
1325         m_deferredRepaintDelay = s_deferredRepaintDelay;
1326         return;
1327     }
1328     if (m_deferredRepaintDelay < s_maxDeferredRepaintDelayDuringLoading) {
1329         m_deferredRepaintDelay += s_deferredRepaintDelayIncrementDuringLoading;
1330         if (m_deferredRepaintDelay > s_maxDeferredRepaintDelayDuringLoading)
1331             m_deferredRepaintDelay = s_maxDeferredRepaintDelayDuringLoading;
1332     }
1333 }
1334
1335 void FrameView::resetDeferredRepaintDelay()
1336 {
1337     m_deferredRepaintDelay = 0;
1338     if (m_deferredRepaintTimer.isActive()) {
1339         m_deferredRepaintTimer.stop();
1340         if (!m_deferringRepaints)
1341             doDeferredRepaints();
1342     }
1343 }
1344
1345 double FrameView::adjustedDeferredRepaintDelay() const
1346 {
1347     if (!m_deferredRepaintDelay)
1348         return 0;
1349     double timeSinceLastPaint = currentTime() - m_lastPaintTime;
1350     return max(0., m_deferredRepaintDelay - timeSinceLastPaint);
1351 }
1352
1353 void FrameView::deferredRepaintTimerFired(Timer<FrameView>*)
1354 {
1355     doDeferredRepaints();
1356 }
1357
1358 void FrameView::layoutTimerFired(Timer<FrameView>*)
1359 {
1360 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1361     if (!m_frame->document()->ownerElement())
1362         printf("Layout timer fired at %d\n", m_frame->document()->elapsedTime());
1363 #endif
1364     layout();
1365 }
1366
1367 void FrameView::scheduleRelayout()
1368 {
1369     // FIXME: We should assert the page is not in the page cache, but that is causing
1370     // too many false assertions.  See <rdar://problem/7218118>.
1371     ASSERT(m_frame->view() == this);
1372
1373     if (m_layoutRoot) {
1374         m_layoutRoot->markContainingBlocksForLayout(false);
1375         m_layoutRoot = 0;
1376     }
1377     if (!m_layoutSchedulingEnabled)
1378         return;
1379     if (!needsLayout())
1380         return;
1381     if (!m_frame->document()->shouldScheduleLayout())
1382         return;
1383
1384 #if defined(ANDROID_FLATTEN_IFRAME) || defined(ANDROID_FLATTEN_FRAMESET)
1385     // This is the Android frame flattening code. The common code below is not
1386     // used as frameSetFlatteningEnabled() is false on Android.
1387     if (m_frame->ownerRenderer())
1388         m_frame->ownerRenderer()->setNeedsLayoutAndPrefWidthsRecalc();
1389 #endif
1390
1391     // When frame flattening is enabled, the contents of the frame affects layout of the parent frames.
1392     // Also invalidate parent frame starting from the owner element of this frame.
1393     if (m_frame->settings() && m_frame->settings()->frameFlatteningEnabled() && m_frame->ownerRenderer()) {
1394         if (m_frame->ownerElement()->hasTagName(iframeTag) || m_frame->ownerElement()->hasTagName(frameTag))
1395             m_frame->ownerRenderer()->setNeedsLayout(true, true);
1396     }
1397
1398     int delay = m_frame->document()->minimumLayoutDelay();
1399     if (m_layoutTimer.isActive() && m_delayedLayout && !delay)
1400         unscheduleRelayout();
1401     if (m_layoutTimer.isActive())
1402         return;
1403
1404     m_delayedLayout = delay != 0;
1405
1406 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1407     if (!m_frame->document()->ownerElement())
1408         printf("Scheduling layout for %d\n", delay);
1409 #endif
1410
1411     m_layoutTimer.startOneShot(delay * 0.001);
1412 }
1413
1414 static bool isObjectAncestorContainerOf(RenderObject* ancestor, RenderObject* descendant)
1415 {
1416     for (RenderObject* r = descendant; r; r = r->container()) {
1417         if (r == ancestor)
1418             return true;
1419     }
1420     return false;
1421 }
1422
1423 void FrameView::scheduleRelayoutOfSubtree(RenderObject* relayoutRoot)
1424 {
1425     ASSERT(m_frame->view() == this);
1426
1427     if (m_frame->contentRenderer() && m_frame->contentRenderer()->needsLayout()) {
1428         if (relayoutRoot)
1429             relayoutRoot->markContainingBlocksForLayout(false);
1430         return;
1431     }
1432
1433     if (layoutPending() || !m_layoutSchedulingEnabled) {
1434         if (m_layoutRoot != relayoutRoot) {
1435             if (isObjectAncestorContainerOf(m_layoutRoot, relayoutRoot)) {
1436                 // Keep the current root
1437                 relayoutRoot->markContainingBlocksForLayout(false, m_layoutRoot);
1438             } else if (m_layoutRoot && isObjectAncestorContainerOf(relayoutRoot, m_layoutRoot)) {
1439                 // Re-root at relayoutRoot
1440                 m_layoutRoot->markContainingBlocksForLayout(false, relayoutRoot);
1441                 m_layoutRoot = relayoutRoot;
1442             } else {
1443                 // Just do a full relayout
1444                 if (m_layoutRoot)
1445                     m_layoutRoot->markContainingBlocksForLayout(false);
1446                 m_layoutRoot = 0;
1447                 relayoutRoot->markContainingBlocksForLayout(false);
1448             }
1449         }
1450     } else if (m_layoutSchedulingEnabled) {
1451         int delay = m_frame->document()->minimumLayoutDelay();
1452         m_layoutRoot = relayoutRoot;
1453         m_delayedLayout = delay != 0;
1454         m_layoutTimer.startOneShot(delay * 0.001);
1455     }
1456 }
1457
1458 bool FrameView::layoutPending() const
1459 {
1460     return m_layoutTimer.isActive();
1461 }
1462
1463 bool FrameView::needsLayout() const
1464 {
1465     // This can return true in cases where the document does not have a body yet.
1466     // Document::shouldScheduleLayout takes care of preventing us from scheduling
1467     // layout in that case.
1468     if (!m_frame)
1469         return false;
1470     RenderView* root = m_frame->contentRenderer();
1471     Document* document = m_frame->document();
1472     return layoutPending()
1473         || (root && root->needsLayout())
1474         || m_layoutRoot
1475         || (document && document->childNeedsStyleRecalc()) // can occur when using WebKit ObjC interface
1476         || m_frame->needsReapplyStyles()
1477         || (m_deferSetNeedsLayouts && m_setNeedsLayoutWasDeferred);
1478 }
1479
1480 void FrameView::setNeedsLayout()
1481 {
1482     if (m_deferSetNeedsLayouts) {
1483         m_setNeedsLayoutWasDeferred = true;
1484         return;
1485     }
1486     RenderView* root = m_frame->contentRenderer();
1487     if (root)
1488         root->setNeedsLayout(true);
1489 }
1490
1491 void FrameView::unscheduleRelayout()
1492 {
1493     if (!m_layoutTimer.isActive())
1494         return;
1495
1496 #ifdef INSTRUMENT_LAYOUT_SCHEDULING
1497     if (!m_frame->document()->ownerElement())
1498         printf("Layout timer unscheduled at %d\n", m_frame->document()->elapsedTime());
1499 #endif
1500
1501     m_layoutTimer.stop();
1502     m_delayedLayout = false;
1503 }
1504
1505 bool FrameView::isTransparent() const
1506 {
1507     return m_isTransparent;
1508 }
1509
1510 void FrameView::setTransparent(bool isTransparent)
1511 {
1512     m_isTransparent = isTransparent;
1513 }
1514
1515 Color FrameView::baseBackgroundColor() const
1516 {
1517     return m_baseBackgroundColor;
1518 }
1519
1520 void FrameView::setBaseBackgroundColor(Color bc)
1521 {
1522     if (!bc.isValid())
1523         bc = Color::white;
1524     m_baseBackgroundColor = bc;
1525 }
1526
1527 void FrameView::updateBackgroundRecursively(const Color& backgroundColor, bool transparent)
1528 {
1529     for (Frame* frame = m_frame.get(); frame; frame = frame->tree()->traverseNext(m_frame.get())) {
1530         FrameView* view = frame->view();
1531         if (!view)
1532             continue;
1533
1534         view->setTransparent(transparent);
1535         view->setBaseBackgroundColor(backgroundColor);
1536     }
1537 }
1538
1539 bool FrameView::shouldUpdateWhileOffscreen() const
1540 {
1541     return m_shouldUpdateWhileOffscreen;
1542 }
1543
1544 void FrameView::setShouldUpdateWhileOffscreen(bool shouldUpdateWhileOffscreen)
1545 {
1546     m_shouldUpdateWhileOffscreen = shouldUpdateWhileOffscreen;
1547 }
1548
1549 void FrameView::scheduleEvent(PassRefPtr<Event> event, PassRefPtr<Node> eventTarget)
1550 {
1551     if (!m_enqueueEvents) {
1552         ExceptionCode ec = 0;
1553         eventTarget->dispatchEvent(event, ec);
1554         return;
1555     }
1556
1557     ScheduledEvent* scheduledEvent = new ScheduledEvent;
1558     scheduledEvent->m_event = event;
1559     scheduledEvent->m_eventTarget = eventTarget;
1560     m_scheduledEvents.append(scheduledEvent);
1561 }
1562
1563 void FrameView::pauseScheduledEvents()
1564 {
1565     ASSERT(m_scheduledEvents.isEmpty() || m_enqueueEvents);
1566     m_enqueueEvents++;
1567 }
1568
1569 void FrameView::resumeScheduledEvents()
1570 {
1571     m_enqueueEvents--;
1572     if (!m_enqueueEvents)
1573         dispatchScheduledEvents();
1574     ASSERT(m_scheduledEvents.isEmpty() || m_enqueueEvents);
1575 }
1576
1577 void FrameView::scrollToAnchor()
1578 {
1579     RefPtr<Node> anchorNode = m_maintainScrollPositionAnchor;
1580     if (!anchorNode)
1581         return;
1582
1583     if (!anchorNode->renderer())
1584         return;
1585
1586     IntRect rect;
1587     if (anchorNode != m_frame->document())
1588         rect = anchorNode->getRect();
1589
1590     // Scroll nested layers and frames to reveal the anchor.
1591     // Align to the top and to the closest side (this matches other browsers).
1592     anchorNode->renderer()->enclosingLayer()->scrollRectToVisible(rect, true, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignTopAlways);
1593
1594     if (AXObjectCache::accessibilityEnabled())
1595         m_frame->document()->axObjectCache()->handleScrolledToAnchor(anchorNode.get());
1596
1597     // scrollRectToVisible can call into setScrollPosition(), which resets m_maintainScrollPositionAnchor.
1598     m_maintainScrollPositionAnchor = anchorNode;
1599 }
1600
1601 bool FrameView::updateWidgets()
1602 {
1603     if (m_nestedLayoutCount > 1 || !m_widgetUpdateSet || m_widgetUpdateSet->isEmpty())
1604         return true;
1605
1606     size_t size = m_widgetUpdateSet->size();
1607
1608     Vector<RenderEmbeddedObject*> objects;
1609     objects.reserveCapacity(size);
1610
1611     RenderEmbeddedObjectSet::const_iterator end = m_widgetUpdateSet->end();
1612     for (RenderEmbeddedObjectSet::const_iterator it = m_widgetUpdateSet->begin(); it != end; ++it) {
1613         objects.uncheckedAppend(*it);
1614         (*it)->ref();
1615     }
1616
1617     for (size_t i = 0; i < size; ++i) {
1618         RenderEmbeddedObject* object = objects[i];
1619
1620         // The object may have been destroyed, but our manual ref() keeps the object from being deleted.
1621         object->updateWidget(false);
1622         object->updateWidgetPosition();
1623
1624         m_widgetUpdateSet->remove(object);
1625     }
1626
1627     RenderArena* arena = m_frame->document()->renderArena();
1628     for (size_t i = 0; i < size; ++i)
1629         objects[i]->deref(arena);
1630
1631     return m_widgetUpdateSet->isEmpty();
1632 }
1633
1634 void FrameView::performPostLayoutTasks()
1635 {
1636     if (m_firstLayoutCallbackPending) {
1637         m_firstLayoutCallbackPending = false;
1638         m_frame->loader()->didFirstLayout();
1639     }
1640
1641     if (m_isVisuallyNonEmpty && m_firstVisuallyNonEmptyLayoutCallbackPending) {
1642         m_firstVisuallyNonEmptyLayoutCallbackPending = false;
1643         m_frame->loader()->didFirstVisuallyNonEmptyLayout();
1644     }
1645
1646     RenderView* root = m_frame->contentRenderer();
1647
1648     root->updateWidgetPositions();
1649
1650     for (unsigned i = 0; i < maxUpdateWidgetsIterations; i++) {
1651         if (updateWidgets())
1652             break;
1653     }
1654
1655     scrollToAnchor();
1656
1657     resumeScheduledEvents();
1658
1659     if (!root->printing()) {
1660         IntSize currentSize = IntSize(width(), height());
1661         float currentZoomFactor = root->style()->zoom();
1662         bool resized = !m_firstLayout && (currentSize != m_lastLayoutSize || currentZoomFactor != m_lastZoomFactor);
1663         m_lastLayoutSize = currentSize;
1664         m_lastZoomFactor = currentZoomFactor;
1665         if (resized)
1666             m_frame->eventHandler()->sendResizeEvent();
1667     }
1668 }
1669
1670 void FrameView::postLayoutTimerFired(Timer<FrameView>*)
1671 {
1672     performPostLayoutTasks();
1673 }
1674
1675 void FrameView::updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow)
1676 {
1677     if (!m_viewportRenderer)
1678         return;
1679
1680     if (m_overflowStatusDirty) {
1681         m_horizontalOverflow = horizontalOverflow;
1682         m_verticalOverflow = verticalOverflow;
1683         m_overflowStatusDirty = false;
1684         return;
1685     }
1686
1687     bool horizontalOverflowChanged = (m_horizontalOverflow != horizontalOverflow);
1688     bool verticalOverflowChanged = (m_verticalOverflow != verticalOverflow);
1689
1690     if (horizontalOverflowChanged || verticalOverflowChanged) {
1691         m_horizontalOverflow = horizontalOverflow;
1692         m_verticalOverflow = verticalOverflow;
1693
1694         scheduleEvent(OverflowEvent::create(horizontalOverflowChanged, horizontalOverflow,
1695             verticalOverflowChanged, verticalOverflow),
1696             m_viewportRenderer->node());
1697     }
1698
1699 }
1700
1701 void FrameView::dispatchScheduledEvents()
1702 {
1703     if (m_scheduledEvents.isEmpty())
1704         return;
1705
1706     Vector<ScheduledEvent*> scheduledEventsCopy = m_scheduledEvents;
1707     m_scheduledEvents.clear();
1708
1709     Vector<ScheduledEvent*>::iterator end = scheduledEventsCopy.end();
1710     for (Vector<ScheduledEvent*>::iterator it = scheduledEventsCopy.begin(); it != end; ++it) {
1711         ScheduledEvent* scheduledEvent = *it;
1712
1713         ExceptionCode ec = 0;
1714
1715         // Only dispatch events to nodes that are in the document
1716         if (scheduledEvent->m_eventTarget->inDocument())
1717             scheduledEvent->m_eventTarget->dispatchEvent(scheduledEvent->m_event, ec);
1718
1719         delete scheduledEvent;
1720     }
1721 }
1722
1723 IntRect FrameView::windowClipRect(bool clipToContents) const
1724 {
1725     ASSERT(m_frame->view() == this);
1726
1727     // Set our clip rect to be our contents.
1728     IntRect clipRect = contentsToWindow(visibleContentRect(!clipToContents));
1729     if (!m_frame || !m_frame->document() || !m_frame->document()->ownerElement())
1730         return clipRect;
1731
1732     // Take our owner element and get the clip rect from the enclosing layer.
1733     Element* elt = m_frame->document()->ownerElement();
1734     RenderLayer* layer = elt->renderer()->enclosingLayer();
1735     // FIXME: layer should never be null, but sometimes seems to be anyway.
1736     if (!layer)
1737         return clipRect;
1738     FrameView* parentView = elt->document()->view();
1739     clipRect.intersect(parentView->windowClipRectForLayer(layer, true));
1740     return clipRect;
1741 }
1742
1743 IntRect FrameView::windowClipRectForLayer(const RenderLayer* layer, bool clipToLayerContents) const
1744 {
1745     // If we have no layer, just return our window clip rect.
1746     if (!layer)
1747         return windowClipRect();
1748
1749     // Apply the clip from the layer.
1750     IntRect clipRect;
1751     if (clipToLayerContents)
1752         clipRect = layer->childrenClipRect();
1753     else
1754         clipRect = layer->selfClipRect();
1755     clipRect = contentsToWindow(clipRect);
1756     return intersection(clipRect, windowClipRect());
1757 }
1758
1759 bool FrameView::isActive() const
1760 {
1761     Page* page = frame()->page();
1762     return page && page->focusController()->isActive();
1763 }
1764
1765 void FrameView::valueChanged(Scrollbar* bar)
1766 {
1767     // Figure out if we really moved.
1768     IntSize offset = scrollOffset();
1769     ScrollView::valueChanged(bar);
1770     if (offset != scrollOffset())
1771         scrollPositionChanged();
1772     frame()->loader()->client()->didChangeScrollOffset();
1773 }
1774
1775 void FrameView::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
1776 {
1777     // Add in our offset within the FrameView.
1778     IntRect dirtyRect = rect;
1779     dirtyRect.move(scrollbar->x(), scrollbar->y());
1780     invalidateRect(dirtyRect);
1781 }
1782
1783 void FrameView::getTickmarks(Vector<IntRect>& tickmarks) const
1784 {
1785     tickmarks = frame()->document()->markers()->renderedRectsForMarkers(DocumentMarker::TextMatch);
1786 }
1787
1788 IntRect FrameView::windowResizerRect() const
1789 {
1790     Page* page = frame() ? frame()->page() : 0;
1791     if (!page)
1792         return IntRect();
1793     return page->chrome()->windowResizerRect();
1794 }
1795
1796 #if ENABLE(DASHBOARD_SUPPORT)
1797 void FrameView::updateDashboardRegions()
1798 {
1799     Document* document = m_frame->document();
1800     if (!document->hasDashboardRegions())
1801         return;
1802     Vector<DashboardRegionValue> newRegions;
1803     document->renderBox()->collectDashboardRegions(newRegions);
1804     if (newRegions == document->dashboardRegions())
1805         return;
1806     document->setDashboardRegions(newRegions);
1807     Page* page = m_frame->page();
1808     if (!page)
1809         return;
1810     page->chrome()->client()->dashboardRegionsChanged();
1811 }
1812 #endif
1813
1814 void FrameView::invalidateScrollCorner()
1815 {
1816     invalidateRect(scrollCornerRect());
1817 }
1818
1819 void FrameView::updateScrollCorner()
1820 {
1821     RenderObject* renderer = 0;
1822     RefPtr<RenderStyle> cornerStyle;
1823
1824     if (!scrollCornerRect().isEmpty()) {
1825         // Try the <body> element first as a scroll corner source.
1826         Document* doc = m_frame->document();
1827         Element* body = doc ? doc->body() : 0;
1828         if (body && body->renderer()) {
1829             renderer = body->renderer();
1830             cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1831         }
1832
1833         if (!cornerStyle) {
1834             // If the <body> didn't have a custom style, then the root element might.
1835             Element* docElement = doc ? doc->documentElement() : 0;
1836             if (docElement && docElement->renderer()) {
1837                 renderer = docElement->renderer();
1838                 cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1839             }
1840         }
1841
1842         if (!cornerStyle) {
1843             // If we have an owning iframe/frame element, then it can set the custom scrollbar also.
1844             if (RenderPart* renderer = m_frame->ownerRenderer())
1845                 cornerStyle = renderer->getUncachedPseudoStyle(SCROLLBAR_CORNER, renderer->style());
1846         }
1847     }
1848
1849     if (cornerStyle) {
1850         if (!m_scrollCorner)
1851             m_scrollCorner = new (renderer->renderArena()) RenderScrollbarPart(renderer->document());
1852         m_scrollCorner->setStyle(cornerStyle.release());
1853         invalidateRect(scrollCornerRect());
1854     } else if (m_scrollCorner) {
1855         m_scrollCorner->destroy();
1856         m_scrollCorner = 0;
1857     }
1858 }
1859
1860 void FrameView::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
1861 {
1862     if (context->updatingControlTints()) {
1863         updateScrollCorner();
1864         return;
1865     }
1866
1867     if (m_scrollCorner) {
1868         m_scrollCorner->paintIntoRect(context, cornerRect.x(), cornerRect.y(), cornerRect);
1869         return;
1870     }
1871
1872     ScrollView::paintScrollCorner(context, cornerRect);
1873 }
1874
1875 bool FrameView::hasCustomScrollbars() const
1876 {
1877     const HashSet<RefPtr<Widget> >* viewChildren = children();
1878     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
1879     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
1880         Widget* widget = current->get();
1881         if (widget->isFrameView()) {
1882             if (static_cast<FrameView*>(widget)->hasCustomScrollbars())
1883                 return true;
1884         } else if (widget->isScrollbar()) {
1885             Scrollbar* scrollbar = static_cast<Scrollbar*>(widget);
1886             if (scrollbar->isCustomScrollbar())
1887                 return true;
1888         }
1889     }
1890
1891     return false;
1892 }
1893
1894 void FrameView::updateControlTints()
1895 {
1896     // This is called when control tints are changed from aqua/graphite to clear and vice versa.
1897     // We do a "fake" paint, and when the theme gets a paint call, it can then do an invalidate.
1898     // This is only done if the theme supports control tinting. It's up to the theme and platform
1899     // to define when controls get the tint and to call this function when that changes.
1900
1901     // Optimize the common case where we bring a window to the front while it's still empty.
1902     if (!m_frame || m_frame->loader()->url().isEmpty())
1903         return;
1904
1905     if ((m_frame->contentRenderer() && m_frame->contentRenderer()->theme()->supportsControlTints()) || hasCustomScrollbars())  {
1906         if (needsLayout())
1907             layout();
1908         PlatformGraphicsContext* const noContext = 0;
1909         GraphicsContext context(noContext);
1910         context.setUpdatingControlTints(true);
1911         if (platformWidget())
1912             paintContents(&context, visibleContentRect());
1913         else
1914             paint(&context, frameRect());
1915     }
1916 }
1917
1918 bool FrameView::wasScrolledByUser() const
1919 {
1920     return m_wasScrolledByUser;
1921 }
1922
1923 void FrameView::setWasScrolledByUser(bool wasScrolledByUser)
1924 {
1925     if (m_inProgrammaticScroll)
1926         return;
1927     m_maintainScrollPositionAnchor = 0;
1928     m_wasScrolledByUser = wasScrolledByUser;
1929 }
1930
1931 void FrameView::paintContents(GraphicsContext* p, const IntRect& rect)
1932 {
1933     if (!frame())
1934         return;
1935
1936 #if ENABLE(INSPECTOR)
1937     if (InspectorTimelineAgent* timelineAgent = inspectorTimelineAgent())
1938         timelineAgent->willPaint(rect);
1939 #endif
1940
1941     Document* document = frame()->document();
1942
1943 #ifndef NDEBUG
1944     bool fillWithRed;
1945     if (document->printing())
1946         fillWithRed = false; // Printing, don't fill with red (can't remember why).
1947     else if (document->ownerElement())
1948         fillWithRed = false; // Subframe, don't fill with red.
1949     else if (isTransparent())
1950         fillWithRed = false; // Transparent, don't fill with red.
1951     else if (m_paintBehavior & PaintBehaviorSelectionOnly)
1952         fillWithRed = false; // Selections are transparent, don't fill with red.
1953     else if (m_nodeToDraw)
1954         fillWithRed = false; // Element images are transparent, don't fill with red.
1955     else
1956         fillWithRed = true;
1957
1958     if (fillWithRed)
1959         p->fillRect(rect, Color(0xFF, 0, 0), DeviceColorSpace);
1960 #endif
1961
1962     bool isTopLevelPainter = !sCurrentPaintTimeStamp;
1963     if (isTopLevelPainter)
1964         sCurrentPaintTimeStamp = currentTime();
1965
1966     RenderView* contentRenderer = frame()->contentRenderer();
1967     if (!contentRenderer) {
1968         LOG_ERROR("called Frame::paint with nil renderer");
1969         return;
1970     }
1971
1972     ASSERT(!needsLayout());
1973     if (needsLayout())
1974         return;
1975
1976 #if USE(ACCELERATED_COMPOSITING)
1977     if (!p->paintingDisabled()) {
1978         if (GraphicsLayer* rootLayer = contentRenderer->compositor()->rootPlatformLayer())
1979             rootLayer->syncCompositingState();
1980     }
1981 #endif
1982
1983     ASSERT(!m_isPainting);
1984
1985     m_isPainting = true;
1986
1987     // m_nodeToDraw is used to draw only one element (and its descendants)
1988     RenderObject* eltRenderer = m_nodeToDraw ? m_nodeToDraw->renderer() : 0;
1989
1990     PaintBehavior oldPaintBehavior = m_paintBehavior;
1991     if (m_paintBehavior == PaintBehaviorNormal)
1992         document->markers()->invalidateRenderedRectsForMarkersInRect(rect);
1993
1994     if (document->printing())
1995         m_paintBehavior |= PaintBehaviorFlattenCompositingLayers;
1996
1997     contentRenderer->layer()->paint(p, rect, m_paintBehavior, eltRenderer);
1998
1999     m_paintBehavior = oldPaintBehavior;
2000
2001     m_isPainting = false;
2002     m_lastPaintTime = currentTime();
2003
2004 #if ENABLE(DASHBOARD_SUPPORT)
2005     // Regions may have changed as a result of the visibility/z-index of element changing.
2006     if (document->dashboardRegionsDirty())
2007         updateDashboardRegions();
2008 #endif
2009
2010     if (isTopLevelPainter)
2011         sCurrentPaintTimeStamp = 0;
2012
2013 #if ENABLE(INSPECTOR)
2014     if (InspectorTimelineAgent* timelineAgent = inspectorTimelineAgent())
2015         timelineAgent->didPaint();
2016 #endif
2017 }
2018
2019 void FrameView::setPaintBehavior(PaintBehavior behavior)
2020 {
2021     m_paintBehavior = behavior;
2022 }
2023
2024 PaintBehavior FrameView::paintBehavior() const
2025 {
2026     return m_paintBehavior;
2027 }
2028
2029 bool FrameView::isPainting() const
2030 {
2031     return m_isPainting;
2032 }
2033
2034 void FrameView::setNodeToDraw(Node* node)
2035 {
2036     m_nodeToDraw = node;
2037 }
2038
2039 void FrameView::layoutIfNeededRecursive()
2040 {
2041     // We have to crawl our entire tree looking for any FrameViews that need
2042     // layout and make sure they are up to date.
2043     // Mac actually tests for intersection with the dirty region and tries not to
2044     // update layout for frames that are outside the dirty region.  Not only does this seem
2045     // pointless (since those frames will have set a zero timer to layout anyway), but
2046     // it is also incorrect, since if two frames overlap, the first could be excluded from the dirty
2047     // region but then become included later by the second frame adding rects to the dirty region
2048     // when it lays out.
2049
2050     if (needsLayout())
2051         layout();
2052
2053     const HashSet<RefPtr<Widget> >* viewChildren = children();
2054     HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
2055     for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
2056         Widget* widget = (*current).get();
2057         if (widget->isFrameView())
2058             static_cast<FrameView*>(widget)->layoutIfNeededRecursive();
2059     }
2060
2061     // layoutIfNeededRecursive is called when we need to make sure layout is up-to-date before
2062     // painting, so we need to flush out any deferred repaints too.
2063     flushDeferredRepaints();
2064 }
2065
2066 void FrameView::flushDeferredRepaints()
2067 {
2068     if (!m_deferredRepaintTimer.isActive())
2069         return;
2070     m_deferredRepaintTimer.stop();
2071     doDeferredRepaints();
2072 }
2073
2074 void FrameView::forceLayout(bool allowSubtree)
2075 {
2076     layout(allowSubtree);
2077     // We cannot unschedule a pending relayout, since the force can be called with
2078     // a tiny rectangle from a drawRect update.  By unscheduling we in effect
2079     // "validate" and stop the necessary full repaint from occurring.  Basically any basic
2080     // append/remove DHTML is broken by this call.  For now, I have removed the optimization
2081     // until we have a better invalidation stategy. -dwh
2082     //unscheduleRelayout();
2083 }
2084
2085 void FrameView::forceLayoutForPagination(const FloatSize& pageSize, float maximumShrinkFactor, Frame::AdjustViewSizeOrNot shouldAdjustViewSize)
2086 {
2087     // Dumping externalRepresentation(m_frame->renderer()).ascii() is a good trick to see
2088     // the state of things before and after the layout
2089     RenderView *root = toRenderView(m_frame->document()->renderer());
2090     if (root) {
2091         int pageW = ceilf(pageSize.width());
2092         m_pageHeight = pageSize.height() ? pageSize.height() : visibleHeight();
2093         root->setWidth(pageW);
2094         root->setNeedsLayoutAndPrefWidthsRecalc();
2095         forceLayout();
2096
2097         // If we don't fit in the given page width, we'll lay out again. If we don't fit in the
2098         // page width when shrunk, we will lay out at maximum shrink and clip extra content.
2099         // FIXME: We are assuming a shrink-to-fit printing implementation.  A cropping
2100         // implementation should not do this!
2101         int rightmostPos = root->rightmostPosition();
2102         if (rightmostPos > pageSize.width()) {
2103             pageW = std::min<int>(rightmostPos, ceilf(pageSize.width() * maximumShrinkFactor));
2104             if (pageSize.height())
2105                 m_pageHeight = pageW / pageSize.width() * pageSize.height();
2106             root->setWidth(pageW);
2107             root->setNeedsLayoutAndPrefWidthsRecalc();
2108             forceLayout();
2109         }
2110     }
2111
2112     if (shouldAdjustViewSize)
2113         adjustViewSize();
2114     m_pageHeight = 0;
2115 }
2116
2117 void FrameView::adjustPageHeight(float *newBottom, float oldTop, float oldBottom, float /*bottomLimit*/)
2118 {
2119     RenderView* root = m_frame->contentRenderer();
2120     if (root) {
2121         // Use a context with painting disabled.
2122         GraphicsContext context((PlatformGraphicsContext*)0);
2123         root->setTruncatedAt((int)floorf(oldBottom));
2124         IntRect dirtyRect(0, (int)floorf(oldTop), root->rightLayoutOverflow(), (int)ceilf(oldBottom - oldTop));
2125         root->layer()->paint(&context, dirtyRect);
2126         *newBottom = root->bestTruncatedAt();
2127         if (*newBottom == 0)
2128             *newBottom = oldBottom;
2129     } else
2130         *newBottom = oldBottom;
2131 }
2132
2133 IntRect FrameView::convertFromRenderer(const RenderObject* renderer, const IntRect& rendererRect) const
2134 {
2135     IntRect rect = renderer->localToAbsoluteQuad(FloatRect(rendererRect)).enclosingBoundingBox();
2136
2137     // Convert from page ("absolute") to FrameView coordinates.
2138     rect.move(-scrollX(), -scrollY());
2139
2140     return rect;
2141 }
2142
2143 IntRect FrameView::convertToRenderer(const RenderObject* renderer, const IntRect& viewRect) const
2144 {
2145     IntRect rect = viewRect;
2146
2147     // Convert from FrameView coords into page ("absolute") coordinates.
2148     rect.move(scrollX(), scrollY());
2149
2150     // FIXME: we don't have a way to map an absolute rect down to a local quad, so just
2151     // move the rect for now.
2152     rect.setLocation(roundedIntPoint(renderer->absoluteToLocal(rect.location(), false, true /* use transforms */)));
2153     return rect;
2154 }
2155
2156 IntPoint FrameView::convertFromRenderer(const RenderObject* renderer, const IntPoint& rendererPoint) const
2157 {
2158     IntPoint point = roundedIntPoint(renderer->localToAbsolute(rendererPoint, false, true /* use transforms */));
2159
2160     // Convert from page ("absolute") to FrameView coordinates.
2161     point.move(-scrollX(), -scrollY());
2162     return point;
2163 }
2164
2165 IntPoint FrameView::convertToRenderer(const RenderObject* renderer, const IntPoint& viewPoint) const
2166 {
2167     IntPoint point = viewPoint;
2168
2169     // Convert from FrameView coords into page ("absolute") coordinates.
2170     point += IntSize(scrollX(), scrollY());
2171
2172     return roundedIntPoint(renderer->absoluteToLocal(point, false, true /* use transforms */));
2173 }
2174
2175 IntRect FrameView::convertToContainingView(const IntRect& localRect) const
2176 {
2177     if (const ScrollView* parentScrollView = parent()) {
2178         if (parentScrollView->isFrameView()) {
2179             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2180             // Get our renderer in the parent view
2181             RenderPart* renderer = m_frame->ownerRenderer();
2182             if (!renderer)
2183                 return localRect;
2184
2185             IntRect rect(localRect);
2186             // Add borders and padding??
2187             rect.move(renderer->borderLeft() + renderer->paddingLeft(),
2188                       renderer->borderTop() + renderer->paddingTop());
2189             return parentView->convertFromRenderer(renderer, rect);
2190         }
2191
2192         return Widget::convertToContainingView(localRect);
2193     }
2194
2195     return localRect;
2196 }
2197
2198 IntRect FrameView::convertFromContainingView(const IntRect& parentRect) const
2199 {
2200     if (const ScrollView* parentScrollView = parent()) {
2201         if (parentScrollView->isFrameView()) {
2202             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2203
2204             // Get our renderer in the parent view
2205             RenderPart* renderer = m_frame->ownerRenderer();
2206             if (!renderer)
2207                 return parentRect;
2208
2209             IntRect rect = parentView->convertToRenderer(renderer, parentRect);
2210             // Subtract borders and padding
2211             rect.move(-renderer->borderLeft() - renderer->paddingLeft(),
2212                       -renderer->borderTop() - renderer->paddingTop());
2213             return rect;
2214         }
2215
2216         return Widget::convertFromContainingView(parentRect);
2217     }
2218
2219     return parentRect;
2220 }
2221
2222 IntPoint FrameView::convertToContainingView(const IntPoint& localPoint) const
2223 {
2224     if (const ScrollView* parentScrollView = parent()) {
2225         if (parentScrollView->isFrameView()) {
2226             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2227
2228             // Get our renderer in the parent view
2229             RenderPart* renderer = m_frame->ownerRenderer();
2230             if (!renderer)
2231                 return localPoint;
2232
2233             IntPoint point(localPoint);
2234
2235             // Add borders and padding
2236             point.move(renderer->borderLeft() + renderer->paddingLeft(),
2237                        renderer->borderTop() + renderer->paddingTop());
2238             return parentView->convertFromRenderer(renderer, point);
2239         }
2240
2241         return Widget::convertToContainingView(localPoint);
2242     }
2243
2244     return localPoint;
2245 }
2246
2247 IntPoint FrameView::convertFromContainingView(const IntPoint& parentPoint) const
2248 {
2249     if (const ScrollView* parentScrollView = parent()) {
2250         if (parentScrollView->isFrameView()) {
2251             const FrameView* parentView = static_cast<const FrameView*>(parentScrollView);
2252
2253             // Get our renderer in the parent view
2254             RenderPart* renderer = m_frame->ownerRenderer();
2255             if (!renderer)
2256                 return parentPoint;
2257
2258             IntPoint point = parentView->convertToRenderer(renderer, parentPoint);
2259             // Subtract borders and padding
2260             point.move(-renderer->borderLeft() - renderer->paddingLeft(),
2261                        -renderer->borderTop() - renderer->paddingTop());
2262             return point;
2263         }
2264
2265         return Widget::convertFromContainingView(parentPoint);
2266     }
2267
2268     return parentPoint;
2269 }
2270
2271 bool FrameView::shouldApplyTextZoom() const
2272 {
2273     if (m_zoomFactor == 1)
2274         return false;
2275     if (!m_frame)
2276         return false;
2277     Page* page = m_frame->page();
2278     return page && page->settings()->zoomMode() == ZoomTextOnly;
2279 }
2280
2281 bool FrameView::shouldApplyPageZoom() const
2282 {
2283     if (m_zoomFactor == 1)
2284         return false;
2285     if (!m_frame)
2286         return false;
2287     Page* page = m_frame->page();
2288     return page && page->settings()->zoomMode() == ZoomPage;
2289 }
2290
2291 void FrameView::setZoomFactor(float percent, ZoomMode mode)
2292 {
2293     if (!m_frame)
2294         return;
2295
2296     Page* page = m_frame->page();
2297     if (!page)
2298         return;
2299
2300     if (m_zoomFactor == percent && page->settings()->zoomMode() == mode)
2301         return;
2302
2303     Document* document = m_frame->document();
2304     if (!document)
2305         return;
2306
2307 #if ENABLE(SVG)
2308     // Respect SVGs zoomAndPan="disabled" property in standalone SVG documents.
2309     // FIXME: How to handle compound documents + zoomAndPan="disabled"? Needs SVG WG clarification.
2310     if (document->isSVGDocument()) {
2311         if (!static_cast<SVGDocument*>(document)->zoomAndPanEnabled())
2312             return;
2313         if (document->renderer())
2314             document->renderer()->setNeedsLayout(true);
2315     }
2316 #endif
2317
2318     if (mode == ZoomPage) {
2319         // Update the scroll position when doing a full page zoom, so the content stays in relatively the same position.
2320         IntPoint scrollPosition = this->scrollPosition();
2321         float percentDifference = (percent / m_zoomFactor);
2322         setScrollPosition(IntPoint(scrollPosition.x() * percentDifference, scrollPosition.y() * percentDifference));
2323     }
2324
2325     m_zoomFactor = percent;
2326     page->settings()->setZoomMode(mode);
2327
2328     document->recalcStyle(Node::Force);
2329
2330     for (Frame* child = m_frame->tree()->firstChild(); child; child = child->tree()->nextSibling()) {
2331         if (FrameView* childView = child->view())
2332             childView->setZoomFactor(m_zoomFactor, mode);
2333     }
2334
2335     if (document->renderer() && document->renderer()->needsLayout() && didFirstLayout())
2336         layout();
2337 }
2338
2339
2340 // Normal delay
2341 void FrameView::setRepaintThrottlingDeferredRepaintDelay(double p)
2342 {
2343     s_deferredRepaintDelay = p;
2344 }
2345
2346 // Negative value would mean that first few repaints happen without a delay
2347 void FrameView::setRepaintThrottlingnInitialDeferredRepaintDelayDuringLoading(double p)
2348 {
2349     s_initialDeferredRepaintDelayDuringLoading = p;
2350 }
2351
2352 // The delay grows on each repaint to this maximum value
2353 void FrameView::setRepaintThrottlingMaxDeferredRepaintDelayDuringLoading(double p)
2354 {
2355     s_maxDeferredRepaintDelayDuringLoading = p;
2356 }
2357
2358 // On each repaint the delay increases by this amount
2359 void FrameView::setRepaintThrottlingDeferredRepaintDelayIncrementDuringLoading(double p)
2360 {
2361     s_deferredRepaintDelayIncrementDuringLoading = p;
2362 }
2363
2364 } // namespace WebCore