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* Copyright (C) 1999 Lars Knoll (
* Copyright (C) 2006 Apple Computer, Inc.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef RenderView_h
#define RenderView_h
#include "core/frame/FrameView.h"
#include "core/paint/ViewDisplayList.h"
#include "core/rendering/LayoutState.h"
#include "core/rendering/PaintInvalidationState.h"
#include "core/rendering/RenderBlockFlow.h"
#include "platform/PODFreeListArena.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/scroll/ScrollableArea.h"
#include "wtf/OwnPtr.h"
namespace blink {
class FlowThreadController;
class RenderLayerCompositor;
class RenderQuote;
// The root of the render tree, corresponding to the CSS initial containing block.
// It's dimensions match that of the logical viewport (which may be different from
// the visible viewport in fixed-layout mode), and it is always at position (0,0)
// relative to the document (and so isn't necessarily in view).
class RenderView final : public RenderBlockFlow {
explicit RenderView(Document*);
virtual ~RenderView();
virtual void trace(Visitor*) override;
bool hitTest(const HitTestRequest&, HitTestResult&);
bool hitTest(const HitTestRequest&, const HitTestLocation&, HitTestResult&);
// Returns the total count of calls to HitTest, for testing.
unsigned hitTestCount() const { return m_hitTestCount; }
virtual const char* renderName() const override { return "RenderView"; }
virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRenderView || RenderBlockFlow::isOfType(type); }
virtual LayerType layerTypeRequired() const override { return NormalLayer; }
virtual bool isChildAllowed(RenderObject*, RenderStyle*) const override;
virtual void layout() override;
virtual void updateLogicalWidth() override;
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const override;
virtual LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const override;
// The same as the FrameView's layoutHeight/layoutWidth but with null check guards.
int viewHeight(IncludeScrollbarsInRect = ExcludeScrollbars) const;
int viewWidth(IncludeScrollbarsInRect = ExcludeScrollbars) const;
int viewLogicalWidth() const
return style()->isHorizontalWritingMode() ? viewWidth(ExcludeScrollbars) : viewHeight(ExcludeScrollbars);
int viewLogicalHeight() const;
LayoutUnit viewLogicalHeightForPercentages() const;
float zoomFactor() const;
FrameView* frameView() const { return m_frameView; }
enum ViewportConstrainedPosition {
void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, ViewportConstrainedPosition, const PaintInvalidationState*) const;
virtual void mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect&, const PaintInvalidationState*) const override;
void invalidatePaintForRectangle(const LayoutRect&, PaintInvalidationReason) const;
void invalidatePaintForViewAndCompositedLayers();
virtual void paint(PaintInfo&, const LayoutPoint&) override;
virtual void paintBoxDecorationBackground(PaintInfo&, const LayoutPoint&) override;
enum SelectionPaintInvalidationMode { PaintInvalidationNewXOROld, PaintInvalidationNewMinusOld };
void setSelection(RenderObject* start, int startPos, RenderObject*, int endPos, SelectionPaintInvalidationMode = PaintInvalidationNewXOROld);
void clearSelection();
RenderObject* selectionStart() const { return m_selectionStart; }
RenderObject* selectionEnd() const { return m_selectionEnd; }
IntRect selectionBounds() const;
void selectionStartEnd(int& startPos, int& endPos) const;
void invalidatePaintForSelection() const;
virtual void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
virtual void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;
virtual LayoutRect viewRect() const override;
bool shouldDoFullPaintInvalidationForNextLayout() const;
bool doingFullPaintInvalidation() const { return m_frameView->needsFullPaintInvalidation(); }
LayoutState* layoutState() const { return m_layoutState; }
virtual void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
LayoutUnit pageLogicalHeight() const { return m_pageLogicalHeight; }
void setPageLogicalHeight(LayoutUnit height)
if (m_pageLogicalHeight != height) {
m_pageLogicalHeight = height;
m_pageLogicalHeightChanged = true;
bool pageLogicalHeightChanged() const { return m_pageLogicalHeightChanged; }
// Notification that this view moved into or out of a native window.
void setIsInWindow(bool);
RenderLayerCompositor* compositor();
bool usesCompositing() const;
IntRect unscaledDocumentRect() const;
LayoutRect backgroundRect(RenderBox* backgroundRenderer) const;
IntRect documentRect() const;
// Renderer that paints the root background has background-images which all have background-attachment: fixed.
bool rootBackgroundIsEntirelyFixed() const;
FlowThreadController* flowThreadController();
IntervalArena* intervalArena();
void setRenderQuoteHead(RenderQuote* head) { m_renderQuoteHead = head; }
RenderQuote* renderQuoteHead() const { return m_renderQuoteHead; }
// FIXME: This is a work around because the current implementation of counters
// requires walking the entire tree repeatedly and most pages don't actually use either
// feature so we shouldn't take the performance hit when not needed. Long term we should
// rewrite the counter and quotes code.
void addRenderCounter() { m_renderCounterCount++; }
void removeRenderCounter() { ASSERT(m_renderCounterCount > 0); m_renderCounterCount--; }
bool hasRenderCounters() { return m_renderCounterCount; }
virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const override;
double layoutViewportWidth() const;
double layoutViewportHeight() const;
void pushLayoutState(LayoutState&);
void popLayoutState();
virtual void invalidateTreeIfNeeded(const PaintInvalidationState&) override final;
ViewDisplayList& viewDisplayList()
if (!m_viewDisplayList)
m_viewDisplayList = adoptPtr(new ViewDisplayList());
return *m_viewDisplayList;
virtual void mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = 0, const PaintInvalidationState* = 0) const override;
virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const override;
virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
void layoutContent();
void checkLayoutState();
friend class ForceHorriblySlowRectMapping;
bool shouldUsePrintingLayout() const;
RenderObject* backgroundRenderer() const;
FrameView* m_frameView;
RawPtrWillBeMember<RenderObject> m_selectionStart;
RawPtrWillBeMember<RenderObject> m_selectionEnd;
int m_selectionStartPos;
int m_selectionEndPos;
LayoutUnit m_pageLogicalHeight;
bool m_pageLogicalHeightChanged;
LayoutState* m_layoutState;
OwnPtr<RenderLayerCompositor> m_compositor;
OwnPtr<FlowThreadController> m_flowThreadController;
RefPtr<IntervalArena> m_intervalArena;
RawPtrWillBeMember<RenderQuote> m_renderQuoteHead;
unsigned m_renderCounterCount;
unsigned m_hitTestCount;
OwnPtr<ViewDisplayList> m_viewDisplayList;
// Suspends the LayoutState cached offset and clipRect optimization. Used under transforms
// that cannot be represented by LayoutState (common in SVG) and when manipulating the render
// tree during layout in ways that can trigger paint invalidation of a non-child (e.g. when a list item
// moves its list marker around). Note that even when disabled, LayoutState is still used to
// store layoutDelta.
class ForceHorriblySlowRectMapping {
ForceHorriblySlowRectMapping(const PaintInvalidationState* paintInvalidationState)
: m_paintInvalidationState(paintInvalidationState)
, m_didDisable(m_paintInvalidationState && m_paintInvalidationState->cachedOffsetsEnabled())
if (m_paintInvalidationState)
m_paintInvalidationState->m_cachedOffsetsEnabled = false;
if (m_didDisable)
m_paintInvalidationState->m_cachedOffsetsEnabled = true;
const PaintInvalidationState* m_paintInvalidationState;
bool m_didDisable;
} // namespace blink
#endif // RenderView_h