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/*
* Copyright (C) 2003, 2009, 2012, 2015 Apple Inc. All rights reserved.
*
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
*
* Other contributors:
* Robert O'Callahan <roc+@cs.cmu.edu>
* David Baron <dbaron@fas.harvard.edu>
* Christian Biesinger <cbiesinger@web.de>
* Randall Jesup <rjesup@wgate.com>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Josh Soref <timeless@mac.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
*/
#pragma once
#include "ClipRect.h"
#include "GraphicsLayer.h"
#include "LayerFragment.h"
#include "PaintInfo.h"
#include "RenderBox.h"
#include "RenderPtr.h"
#include "ScrollableArea.h"
#include <memory>
namespace WTF {
class TextStream;
}
namespace WebCore {
class ClipRects;
class ClipRectsCache;
class FilterEffectRenderer;
class FilterEffectRendererHelper;
class FilterOperations;
class HitTestRequest;
class HitTestResult;
class HitTestingTransformState;
class PaintFrequencyInfo;
class RenderFragmentedFlow;
class RenderGeometryMap;
class RenderLayerBacking;
class RenderLayerCompositor;
class RenderMarquee;
class RenderReplica;
class RenderScrollbarPart;
class RenderStyle;
class RenderView;
class Scrollbar;
class TransformationMatrix;
enum BorderRadiusClippingRule { IncludeSelfForBorderRadius, DoNotIncludeSelfForBorderRadius };
enum IncludeSelfOrNot { IncludeSelf, ExcludeSelf };
enum RepaintStatus {
NeedsNormalRepaint,
NeedsFullRepaint,
NeedsFullRepaintForPositionedMovementLayout
};
enum ClipRectsType {
PaintingClipRects, // Relative to painting ancestor. Used for painting.
RootRelativeClipRects, // Relative to the ancestor treated as the root (e.g. transformed layer). Used for hit testing.
AbsoluteClipRects, // Relative to the RenderView's layer. Used for compositing overlap testing.
NumCachedClipRectsTypes,
AllClipRectTypes,
TemporaryClipRects
};
enum ShouldRespectOverflowClip {
IgnoreOverflowClip,
RespectOverflowClip
};
enum ShouldApplyRootOffsetToFragments {
ApplyRootOffsetToFragments,
IgnoreRootOffsetForFragments
};
enum LayerScrollCoordinationRole {
ViewportConstrained = 1 << 0,
Scrolling = 1 << 1
};
typedef unsigned LayerScrollCoordinationRoles;
enum class RequestState {
Unknown,
DontCare,
False,
True,
Undetermined
};
class RenderLayer final : public ScrollableArea {
WTF_MAKE_FAST_ALLOCATED;
public:
friend class RenderReplica;
explicit RenderLayer(RenderLayerModelObject&);
virtual ~RenderLayer();
#if PLATFORM(IOS)
// Called before the renderer's widget (if any) has been nulled out.
void willBeDestroyed();
#endif
String name() const;
RenderLayerModelObject& renderer() const { return m_renderer; }
RenderBox* renderBox() const { return is<RenderBox>(renderer()) ? &downcast<RenderBox>(renderer()) : nullptr; }
RenderLayer* parent() const { return m_parent; }
RenderLayer* previousSibling() const { return m_previous; }
RenderLayer* nextSibling() const { return m_next; }
RenderLayer* firstChild() const { return m_first; }
RenderLayer* lastChild() const { return m_last; }
void addChild(RenderLayer* newChild, RenderLayer* beforeChild = nullptr);
RenderLayer* removeChild(RenderLayer*);
Page& page() const { return renderer().page(); }
void removeOnlyThisLayer();
void insertOnlyThisLayer();
void repaintIncludingDescendants();
// Indicate that the layer contents need to be repainted. Only has an effect
// if layer compositing is being used.
void setBackingNeedsRepaint(GraphicsLayer::ShouldClipToLayer = GraphicsLayer::ClipToLayer);
// The rect is in the coordinate space of the layer's render object.
void setBackingNeedsRepaintInRect(const LayoutRect&, GraphicsLayer::ShouldClipToLayer = GraphicsLayer::ClipToLayer);
void repaintIncludingNonCompositingDescendants(RenderLayerModelObject* repaintContainer);
void styleChanged(StyleDifference, const RenderStyle* oldStyle);
RenderMarquee* marquee() const { return m_marquee.get(); }
bool isNormalFlowOnly() const { return m_isNormalFlowOnly; }
bool isSelfPaintingLayer() const { return m_isSelfPaintingLayer; }
bool cannotBlitToWindow() const;
bool isTransparent() const { return renderer().isTransparent() || renderer().hasMask(); }
bool hasReflection() const { return renderer().hasReflection(); }
bool isReflection() const { return renderer().isReplica(); }
RenderReplica* reflection() const { return m_reflection.get(); }
RenderLayer* reflectionLayer() const;
const RenderLayer* root() const
{
const RenderLayer* curr = this;
while (curr->parent())
curr = curr->parent();
return curr;
}
const LayoutPoint& location() const { return m_topLeft; }
void setLocation(const LayoutPoint& p) { m_topLeft = p; }
const IntSize& size() const { return m_layerSize; }
void setSize(const IntSize& size) { m_layerSize = size; }
LayoutRect rect() const { return LayoutRect(location(), size()); }
int scrollWidth() const;
int scrollHeight() const;
void panScrollFromPoint(const IntPoint&);
// Scrolling methods for layers that can scroll their overflow.
void scrollByRecursively(const IntSize& delta, ScrollableArea** scrolledArea = nullptr);
WEBCORE_EXPORT void scrollToOffset(const ScrollOffset&, ScrollClamping = ScrollClamping::Clamped);
void scrollToXOffset(int x, ScrollClamping clamping = ScrollClamping::Clamped) { scrollToOffset(ScrollOffset(x, scrollOffset().y()), clamping); }
void scrollToYOffset(int y, ScrollClamping clamping = ScrollClamping::Clamped) { scrollToOffset(ScrollOffset(scrollOffset().x(), y), clamping); }
void scrollToXPosition(int x, ScrollClamping = ScrollClamping::Clamped);
void scrollToYPosition(int y, ScrollClamping = ScrollClamping::Clamped);
void setPostLayoutScrollPosition(std::optional<ScrollPosition>);
void applyPostLayoutScrollPositionIfNeeded();
ScrollOffset scrollOffset() const { return scrollOffsetFromPosition(m_scrollPosition); }
IntSize scrollableContentsSize() const;
void availableContentSizeChanged(AvailableSizeChangeReason) override;
// "absoluteRect" is in scaled document coordinates.
void scrollRectToVisible(SelectionRevealMode, const LayoutRect& absoluteRect, bool insideFixed, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
bool scrollsOverflow() const;
bool hasScrollbars() const { return m_hBar || m_vBar; }
void setHasHorizontalScrollbar(bool);
void setHasVerticalScrollbar(bool);
Ref<Scrollbar> createScrollbar(ScrollbarOrientation);
void destroyScrollbar(ScrollbarOrientation);
bool hasHorizontalScrollbar() const { return horizontalScrollbar(); }
bool hasVerticalScrollbar() const { return verticalScrollbar(); }
// ScrollableArea overrides
ScrollPosition scrollPosition() const override { return m_scrollPosition; }
Scrollbar* horizontalScrollbar() const override { return m_hBar.get(); }
Scrollbar* verticalScrollbar() const override { return m_vBar.get(); }
ScrollableArea* enclosingScrollableArea() const override;
bool isScrollableOrRubberbandable() override;
bool hasScrollableOrRubberbandableAncestor() override;
#if ENABLE(CSS_SCROLL_SNAP)
void updateSnapOffsets() override;
#endif
#if PLATFORM(IOS)
#if ENABLE(TOUCH_EVENTS)
bool handleTouchEvent(const PlatformTouchEvent&) override;
#endif
void didStartScroll() override;
void didEndScroll() override;
void didUpdateScroll() override;
void setIsUserScroll(bool isUserScroll) override { m_inUserScroll = isUserScroll; }
bool isInUserScroll() const { return m_inUserScroll; }
bool requiresScrollBoundsOriginUpdate() const { return m_requiresScrollBoundsOriginUpdate; }
void setRequiresScrollBoundsOriginUpdate(bool requiresUpdate = true) { m_requiresScrollBoundsOriginUpdate = requiresUpdate; }
// Returns true when the layer could do touch scrolling, but doesn't look at whether there is actually scrollable overflow.
bool hasAcceleratedTouchScrolling() const;
// Returns true when there is actually scrollable overflow (requires layout to be up-to-date).
bool hasTouchScrollableOverflow() const;
#else
bool hasAcceleratedTouchScrolling() const { return false; }
bool hasTouchScrollableOverflow() const { return false; }
#endif
bool usesAcceleratedScrolling() const;
int verticalScrollbarWidth(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
int horizontalScrollbarHeight(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
bool hasOverflowControls() const;
bool isPointInResizeControl(const IntPoint& absolutePoint) const;
bool hitTestOverflowControls(HitTestResult&, const IntPoint& localPoint);
IntSize offsetFromResizeCorner(const IntPoint& absolutePoint) const;
void paintOverflowControls(GraphicsContext&, const IntPoint&, const IntRect& damageRect, bool paintingOverlayControls = false);
void paintScrollCorner(GraphicsContext&, const IntPoint&, const IntRect& damageRect);
void paintResizer(GraphicsContext&, const LayoutPoint&, const LayoutRect& damageRect);
void updateScrollInfoAfterLayout();
bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1);
void autoscroll(const IntPoint&);
bool canResize() const;
void resize(const PlatformMouseEvent&, const LayoutSize&);
bool inResizeMode() const { return m_inResizeMode; }
void setInResizeMode(bool b) { m_inResizeMode = b; }
bool isRenderViewLayer() const { return m_isRenderViewLayer; }
RenderLayerCompositor& compositor() const;
// Notification from the renderer that its content changed (e.g. current frame of image changed).
// Allows updates of layer content without repainting.
void contentChanged(ContentChangeType);
bool canRender3DTransforms() const;
enum UpdateLayerPositionsFlag {
CheckForRepaint = 1 << 0,
NeedsFullRepaintInBacking = 1 << 1,
IsCompositingUpdateRoot = 1 << 2,
UpdateCompositingLayers = 1 << 3,
UpdatePagination = 1 << 4,
SeenTransformedLayer = 1 << 5,
Seen3DTransformedLayer = 1 << 6
};
typedef unsigned UpdateLayerPositionsFlags;
static const UpdateLayerPositionsFlags defaultFlags = CheckForRepaint | IsCompositingUpdateRoot | UpdateCompositingLayers;
void updateLayerPositionsAfterLayout(const RenderLayer* rootLayer, UpdateLayerPositionsFlags);
void updateLayerPositionsAfterOverflowScroll();
void updateLayerPositionsAfterDocumentScroll();
void positionNewlyCreatedOverflowControls();
bool hasCompositedLayerInEnclosingPaginationChain() const;
enum PaginationInclusionMode { ExcludeCompositedPaginatedLayers, IncludeCompositedPaginatedLayers };
RenderLayer* enclosingPaginationLayer(PaginationInclusionMode mode) const
{
if (mode == ExcludeCompositedPaginatedLayers && hasCompositedLayerInEnclosingPaginationChain())
return nullptr;
return m_enclosingPaginationLayer;
}
void updateTransform();
#if ENABLE(CSS_COMPOSITING)
void updateBlendMode();
#endif
const LayoutSize& offsetForInFlowPosition() const { return m_offsetForInFlowPosition; }
void clearClipRectsIncludingDescendants(ClipRectsType typeToClear = AllClipRectTypes);
void clearClipRects(ClipRectsType typeToClear = AllClipRectTypes);
void addBlockSelectionGapsBounds(const LayoutRect&);
void clearBlockSelectionGapsBounds();
void repaintBlockSelectionGaps();
// A stacking context is a layer that has a non-auto z-index.
bool isStackingContext() const { return isStackingContext(&renderer().style()); }
// A stacking container can have z-order lists. All stacking contexts are
// stacking containers, but the converse is not true. Layers that use
// composited scrolling are stacking containers, but they may not
// necessarily be stacking contexts.
bool isStackingContainer() const { return isStackingContext() || needsCompositedScrolling(); }
// Gets the enclosing stacking container for this layer, excluding this
// layer itself.
RenderLayer* stackingContainer() const;
// Gets the enclosing stacking container for this layer, possibly the layer
// itself, if it is a stacking container.
RenderLayer* enclosingStackingContainer() { return isStackingContainer() ? this : stackingContainer(); }
void dirtyZOrderLists();
void dirtyStackingContainerZOrderLists();
Vector<RenderLayer*>* posZOrderList() const
{
ASSERT(!m_zOrderListsDirty);
ASSERT(isStackingContainer() || !m_posZOrderList);
return m_posZOrderList.get();
}
bool hasNegativeZOrderList() const { return negZOrderList() && negZOrderList()->size(); }
Vector<RenderLayer*>* negZOrderList() const
{
ASSERT(!m_zOrderListsDirty);
ASSERT(isStackingContainer() || !m_negZOrderList);
return m_negZOrderList.get();
}
void dirtyNormalFlowList();
Vector<RenderLayer*>* normalFlowList() const { ASSERT(!m_normalFlowListDirty); return m_normalFlowList.get(); }
// Update our normal and z-index lists.
void updateLayerListsIfNeeded();
// Update the normal and z-index lists of our descendants.
void updateDescendantsLayerListsIfNeeded(bool recursive);
// FIXME: We should ASSERT(!m_visibleContentStatusDirty) here, but see https://bugs.webkit.org/show_bug.cgi?id=71044
// ditto for hasVisibleDescendant(), see https://bugs.webkit.org/show_bug.cgi?id=71277
bool hasVisibleContent() const { return m_hasVisibleContent; }
bool hasVisibleDescendant() const { return m_hasVisibleDescendant; }
void setHasVisibleContent();
void dirtyVisibleContentStatus();
bool hasVisibleBoxDecorationsOrBackground() const;
bool hasVisibleBoxDecorations() const;
struct PaintedContentRequest {
void makeStatesUndetermined()
{
if (hasPaintedContent == RequestState::Unknown)
hasPaintedContent = RequestState::Undetermined;
if (hasSubpixelAntialiasedText == RequestState::Unknown)
hasSubpixelAntialiasedText = RequestState::Undetermined;
}
void setHasPaintedContent() { hasPaintedContent = RequestState::True; }
void setHasSubpixelAntialiasedText() { hasSubpixelAntialiasedText = RequestState::True; }
bool needToDeterminePaintedContentState() const { return hasPaintedContent == RequestState::Unknown; }
bool needToDetermineSubpixelAntialiasedTextState() const { return hasSubpixelAntialiasedText == RequestState::Unknown; }
bool probablyHasPaintedContent() const { return hasPaintedContent == RequestState::True || hasPaintedContent == RequestState::Undetermined; }
bool probablyHasSubpixelAntialiasedText() const { return hasSubpixelAntialiasedText == RequestState::True || hasSubpixelAntialiasedText == RequestState::Undetermined; }
bool isSatisfied() const { return hasPaintedContent != RequestState::Unknown && hasSubpixelAntialiasedText != RequestState::Unknown; }
RequestState hasPaintedContent { RequestState::Unknown };
RequestState hasSubpixelAntialiasedText { RequestState::DontCare };
};
// Returns true if this layer has visible content (ignoring any child layers).
bool isVisuallyNonEmpty(PaintedContentRequest* = nullptr) const;
// True if this layer container renderers that paint.
bool hasNonEmptyChildRenderers(PaintedContentRequest&) const;
// FIXME: We should ASSERT(!m_hasSelfPaintingLayerDescendantDirty); here but we hit the same bugs as visible content above.
// Part of the issue is with subtree relayout: we don't check if our ancestors have some descendant flags dirty, missing some updates.
bool hasSelfPaintingLayerDescendant() const { return m_hasSelfPaintingLayerDescendant; }
// This returns true if we have an out of flow positioned descendant whose
// containing block is not a descendant of ours. If this is true, we cannot
// automatically opt into composited scrolling since this out of flow
// positioned descendant would become clipped by us, possibly altering the
// rendering of the page.
// FIXME: We should ASSERT(!m_hasOutOfFlowPositionedDescendantDirty); here but we may hit the same bugs as visible content above.
bool hasOutOfFlowPositionedDescendant() const { return m_hasOutOfFlowPositionedDescendant; }
// Gets the nearest enclosing positioned ancestor layer (also includes
// the <html> layer and the root layer).
RenderLayer* enclosingAncestorForPosition(EPosition) const;
// Returns the nearest enclosing layer that is scrollable.
RenderLayer* enclosingScrollableLayer() const;
// The layer relative to which clipping rects for this layer are computed.
RenderLayer* clippingRootForPainting() const;
RenderLayer* enclosingOverflowClipLayer(IncludeSelfOrNot) const;
// Enclosing compositing layer; if includeSelf is true, may return this.
RenderLayer* enclosingCompositingLayer(IncludeSelfOrNot = IncludeSelf) const;
RenderLayer* enclosingCompositingLayerForRepaint(IncludeSelfOrNot = IncludeSelf) const;
// Ancestor compositing layer, excluding this.
RenderLayer* ancestorCompositingLayer() const { return enclosingCompositingLayer(ExcludeSelf); }
RenderLayer* enclosingFilterLayer(IncludeSelfOrNot = IncludeSelf) const;
RenderLayer* enclosingFilterRepaintLayer() const;
void setFilterBackendNeedsRepaintingInRect(const LayoutRect&);
bool hasAncestorWithFilterOutsets() const;
bool canUseConvertToLayerCoords() const
{
// These RenderObject have an impact on their layers' without them knowing about it.
return !renderer().hasTransform() && !renderer().isSVGRoot();
}
// FIXME: adjustForColumns allows us to position compositing layers in columns correctly, but eventually they need to be split across columns too.
enum ColumnOffsetAdjustment { DontAdjustForColumns, AdjustForColumns };
void convertToPixelSnappedLayerCoords(const RenderLayer* ancestorLayer, IntPoint& location, ColumnOffsetAdjustment adjustForColumns = DontAdjustForColumns) const;
LayoutPoint convertToLayerCoords(const RenderLayer* ancestorLayer, const LayoutPoint&, ColumnOffsetAdjustment adjustForColumns = DontAdjustForColumns) const;
LayoutSize offsetFromAncestor(const RenderLayer*, ColumnOffsetAdjustment = DontAdjustForColumns) const;
int zIndex() const { return renderer().style().zIndex(); }
enum PaintLayerFlag {
PaintLayerHaveTransparency = 1 << 0,
PaintLayerAppliedTransform = 1 << 1,
PaintLayerTemporaryClipRects = 1 << 2,
PaintLayerPaintingReflection = 1 << 3,
PaintLayerPaintingOverlayScrollbars = 1 << 4,
PaintLayerPaintingCompositingBackgroundPhase = 1 << 5,
PaintLayerPaintingCompositingForegroundPhase = 1 << 6,
PaintLayerPaintingCompositingMaskPhase = 1 << 7,
PaintLayerPaintingCompositingClipPathPhase = 1 << 8,
PaintLayerPaintingCompositingScrollingPhase = 1 << 9,
PaintLayerPaintingOverflowContents = 1 << 10,
PaintLayerPaintingRootBackgroundOnly = 1 << 11,
PaintLayerPaintingSkipRootBackground = 1 << 12,
PaintLayerPaintingChildClippingMaskPhase = 1 << 13,
PaintLayerPaintingCompositingAllPhases = PaintLayerPaintingCompositingBackgroundPhase | PaintLayerPaintingCompositingForegroundPhase
};
typedef unsigned PaintLayerFlags;
enum class SecurityOriginPaintPolicy { AnyOrigin, AccessibleOriginOnly };
// The two main functions that use the layer system. The paint method
// paints the layers that intersect the damage rect from back to
// front. The hitTest method looks for mouse events by walking
// layers that intersect the point from front to back.
void paint(GraphicsContext&, const LayoutRect& damageRect, const LayoutSize& subpixelOffset = LayoutSize(), PaintBehavior = PaintBehaviorNormal,
RenderObject* subtreePaintRoot = nullptr, PaintLayerFlags = 0, SecurityOriginPaintPolicy = SecurityOriginPaintPolicy::AnyOrigin);
bool hitTest(const HitTestRequest&, HitTestResult&);
bool hitTest(const HitTestRequest&, const HitTestLocation&, HitTestResult&);
void paintOverlayScrollbars(GraphicsContext&, const LayoutRect& damageRect, PaintBehavior, RenderObject* subtreePaintRoot = nullptr);
struct ClipRectsContext {
ClipRectsContext(const RenderLayer* inRootLayer, ClipRectsType inClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, ShouldRespectOverflowClip inRespectOverflowClip = RespectOverflowClip)
: rootLayer(inRootLayer)
, clipRectsType(inClipRectsType)
, overlayScrollbarSizeRelevancy(inOverlayScrollbarSizeRelevancy)
, respectOverflowClip(inRespectOverflowClip)
{ }
const RenderLayer* rootLayer;
ClipRectsType clipRectsType;
OverlayScrollbarSizeRelevancy overlayScrollbarSizeRelevancy;
ShouldRespectOverflowClip respectOverflowClip;
};
// This method figures out our layerBounds in coordinates relative to
// |rootLayer}. It also computes our background and foreground clip rects
// for painting/event handling.
// Pass offsetFromRoot if known.
void calculateRects(const ClipRectsContext&, const LayoutRect& paintDirtyRect, LayoutRect& layerBounds,
ClipRect& backgroundRect, ClipRect& foregroundRect, const LayoutSize& offsetFromRoot) const;
// Public just for RenderTreeAsText.
void collectFragments(LayerFragments&, const RenderLayer* rootLayer, const LayoutRect& dirtyRect,
PaginationInclusionMode,
ClipRectsType, OverlayScrollbarSizeRelevancy inOverlayScrollbarSizeRelevancy, ShouldRespectOverflowClip, const LayoutSize& offsetFromRoot,
const LayoutRect* layerBoundingBox = nullptr, ShouldApplyRootOffsetToFragments = IgnoreRootOffsetForFragments);
LayoutRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space.
LayoutRect selfClipRect() const; // Returns the background clip rect of the layer in the document's coordinate space.
LayoutRect localClipRect(bool& clipExceedsBounds) const; // Returns the background clip rect of the layer in the local coordinate space.
// Pass offsetFromRoot if known.
bool intersectsDamageRect(const LayoutRect& layerBounds, const LayoutRect& damageRect, const RenderLayer* rootLayer, const LayoutSize& offsetFromRoot, const LayoutRect* cachedBoundingBox = nullptr) const;
enum CalculateLayerBoundsFlag {
IncludeSelfTransform = 1 << 0,
UseLocalClipRectIfPossible = 1 << 1,
IncludeLayerFilterOutsets = 1 << 2,
ExcludeHiddenDescendants = 1 << 3,
DontConstrainForMask = 1 << 4,
IncludeCompositedDescendants = 1 << 5,
UseFragmentBoxesExcludingCompositing = 1 << 6,
UseFragmentBoxesIncludingCompositing = 1 << 7,
DefaultCalculateLayerBoundsFlags = IncludeSelfTransform | UseLocalClipRectIfPossible | IncludeLayerFilterOutsets | UseFragmentBoxesExcludingCompositing
};
typedef unsigned CalculateLayerBoundsFlags;
// Bounding box relative to some ancestor layer. Pass offsetFromRoot if known.
LayoutRect boundingBox(const RenderLayer* rootLayer, const LayoutSize& offsetFromRoot = LayoutSize(), CalculateLayerBoundsFlags = 0) const;
// Bounding box in the coordinates of this layer.
LayoutRect localBoundingBox(CalculateLayerBoundsFlags = 0) const;
// Deprecated: Pixel snapped bounding box relative to the root.
WEBCORE_EXPORT IntRect absoluteBoundingBox() const;
// Device pixel snapped bounding box relative to the root. absoluteBoundingBox() callers will be directed to this.
FloatRect absoluteBoundingBoxForPainting() const;
// Bounds used for layer overlap testing in RenderLayerCompositor.
LayoutRect overlapBounds() const { return overlapBoundsIncludeChildren() ? calculateLayerBounds(this, LayoutSize()) : localBoundingBox(); }
// Takes transform animations into account, returning true if they could be cheaply computed.
// Unlike overlapBounds, these bounds include descendant layers.
bool getOverlapBoundsIncludingChildrenAccountingForTransformAnimations(LayoutRect&, CalculateLayerBoundsFlags additionalFlags = 0) const;
// If true, this layer's children are included in its bounds for overlap testing.
// We can't rely on the children's positions if this layer has a filter that could have moved the children's pixels around.
bool overlapBoundsIncludeChildren() const { return hasFilter() && renderer().style().filter().hasFilterThatMovesPixels(); }
// Can pass offsetFromRoot if known.
LayoutRect calculateLayerBounds(const RenderLayer* ancestorLayer, const LayoutSize& offsetFromRoot, CalculateLayerBoundsFlags = DefaultCalculateLayerBoundsFlags) const;
// Return a cached repaint rect, computed relative to the layer renderer's containerForRepaint.
bool hasComputedRepaintRects() const { return renderer().hasRepaintLayoutRects(); }
LayoutRect repaintRectIncludingNonCompositingDescendants() const;
void setRepaintStatus(RepaintStatus status) { m_repaintStatus = status; }
RepaintStatus repaintStatus() const { return static_cast<RepaintStatus>(m_repaintStatus); }
LayoutUnit staticInlinePosition() const { return m_staticInlinePosition; }
LayoutUnit staticBlockPosition() const { return m_staticBlockPosition; }
void setStaticInlinePosition(LayoutUnit position) { m_staticInlinePosition = position; }
void setStaticBlockPosition(LayoutUnit position) { m_staticBlockPosition = position; }
#if PLATFORM(IOS)
bool adjustForIOSCaretWhenScrolling() const { return m_adjustForIOSCaretWhenScrolling; }
void setAdjustForIOSCaretWhenScrolling(bool adjustForIOSCaretWhenScrolling) { m_adjustForIOSCaretWhenScrolling = adjustForIOSCaretWhenScrolling; }
#endif
bool hasTransform() const { return renderer().hasTransform(); }
// Note that this transform has the transform-origin baked in.
TransformationMatrix* transform() const { return m_transform.get(); }
// currentTransform computes a transform which takes accelerated animations into account. The
// resulting transform has transform-origin baked in. If the layer does not have a transform,
// returns the identity matrix.
TransformationMatrix currentTransform(RenderStyle::ApplyTransformOrigin = RenderStyle::IncludeTransformOrigin) const;
TransformationMatrix renderableTransform(PaintBehavior) const;
// Get the perspective transform, which is applied to transformed sublayers.
// Returns true if the layer has a -webkit-perspective.
// Note that this transform has the perspective-origin baked in.
TransformationMatrix perspectiveTransform() const;
FloatPoint perspectiveOrigin() const;
bool preserves3D() const { return renderer().style().transformStyle3D() == TransformStyle3DPreserve3D; }
bool has3DTransform() const { return m_transform && !m_transform->isAffine(); }
void filterNeedsRepaint();
bool hasFilter() const { return renderer().hasFilter(); }
bool hasBackdropFilter() const
{
#if ENABLE(FILTERS_LEVEL_2)
return renderer().hasBackdropFilter();
#else
return false;
#endif
}
#if ENABLE(CSS_COMPOSITING)
bool hasBlendMode() const { return renderer().hasBlendMode(); }
BlendMode blendMode() const { return static_cast<BlendMode>(m_blendMode); }
bool isolatesCompositedBlending() const { return m_hasNotIsolatedCompositedBlendingDescendants && isStackingContext(); }
bool hasNotIsolatedCompositedBlendingDescendants() const { return m_hasNotIsolatedCompositedBlendingDescendants; }
void setHasNotIsolatedCompositedBlendingDescendants(bool hasNotIsolatedCompositedBlendingDescendants)
{
m_hasNotIsolatedCompositedBlendingDescendants = hasNotIsolatedCompositedBlendingDescendants;
}
bool isolatesBlending() const { return hasNotIsolatedBlendingDescendants() && isStackingContext(); }
// FIXME: We should ASSERT(!m_hasNotIsolatedBlendingDescendantsStatusDirty); here but we hit the same bugs as visible content above.
bool hasNotIsolatedBlendingDescendants() const { return m_hasNotIsolatedBlendingDescendants; }
bool hasNotIsolatedBlendingDescendantsStatusDirty() const { return m_hasNotIsolatedBlendingDescendantsStatusDirty; }
#else
bool hasBlendMode() const { return false; }
bool isolatesCompositedBlending() const { return false; }
bool isolatesBlending() const { return false; }
bool hasNotIsolatedBlendingDescendantsStatusDirty() const { return false; }
#endif
bool isComposited() const { return m_backing != 0; }
bool hasCompositingDescendant() const { return m_hasCompositingDescendant; }
bool hasCompositedMask() const;
RenderLayerBacking* backing() const { return m_backing.get(); }
RenderLayerBacking* ensureBacking();
void clearBacking(bool layerBeingDestroyed = false);
GraphicsLayer* layerForScrolling() const override;
GraphicsLayer* layerForHorizontalScrollbar() const override;
GraphicsLayer* layerForVerticalScrollbar() const override;
GraphicsLayer* layerForScrollCorner() const override;
bool usesCompositedScrolling() const override;
bool usesAsyncScrolling() const override;
WEBCORE_EXPORT bool needsCompositedScrolling() const;
bool paintsWithTransparency(PaintBehavior paintBehavior) const
{
return (isTransparent() || hasBlendMode() || (isolatesBlending() && !renderer().isDocumentElementRenderer())) && ((paintBehavior & PaintBehaviorFlattenCompositingLayers) || !isComposited());
}
bool paintsWithTransform(PaintBehavior) const;
bool shouldPaintMask(PaintBehavior, PaintLayerFlags) const;
bool shouldApplyClipPath(PaintBehavior, PaintLayerFlags) const;
// Returns true if background phase is painted opaque in the given rect.
// The query rect is given in local coordinates.
bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const;
bool scrollingMayRevealBackground() const;
bool containsDirtyOverlayScrollbars() const { return m_containsDirtyOverlayScrollbars; }
void setContainsDirtyOverlayScrollbars(bool dirtyScrollbars) { m_containsDirtyOverlayScrollbars = dirtyScrollbars; }
bool paintsWithFilters() const;
bool requiresFullLayerImageForFilters() const;
FilterEffectRenderer* filterRenderer() const;
#if !ASSERT_DISABLED
bool layerListMutationAllowed() const { return m_layerListMutationAllowed; }
void setLayerListMutationAllowed(bool flag) { m_layerListMutationAllowed = flag; }
#endif
Element* enclosingElement() const;
enum ViewportConstrainedNotCompositedReason {
NoNotCompositedReason,
NotCompositedForBoundsOutOfView,
NotCompositedForNonViewContainer,
NotCompositedForNoVisibleContent,
};
void setViewportConstrainedNotCompositedReason(ViewportConstrainedNotCompositedReason reason) { m_viewportConstrainedNotCompositedReason = reason; }
ViewportConstrainedNotCompositedReason viewportConstrainedNotCompositedReason() const { return static_cast<ViewportConstrainedNotCompositedReason>(m_viewportConstrainedNotCompositedReason); }
bool isRenderFragmentedFlow() const { return renderer().isRenderFragmentedFlow(); }
bool isOutOfFlowRenderFragmentedFlow() const { return renderer().isOutOfFlowRenderFragmentedFlow(); }
bool isInsideFragmentedFlow() const { return renderer().fragmentedFlowState() != RenderObject::NotInsideFragmentedFlow; }
bool isDirtyRenderFragmentedFlow() const
{
ASSERT(isRenderFragmentedFlow());
return m_zOrderListsDirty || m_normalFlowListDirty;
}
RenderLayer* enclosingFragmentedFlowAncestor() const;
bool shouldPlaceBlockDirectionScrollbarOnLeft() const final { return renderer().shouldPlaceBlockDirectionScrollbarOnLeft(); }
WEBCORE_EXPORT void simulateFrequentPaint();
WEBCORE_EXPORT bool paintingFrequently() const;
void clearPaintFrequencyInfo();
private:
enum CollectLayersBehavior { StopAtStackingContexts, StopAtStackingContainers };
struct LayerPaintingInfo {
LayerPaintingInfo(RenderLayer* inRootLayer, const LayoutRect& inDirtyRect, PaintBehavior inPaintBehavior, const LayoutSize& inSubpixelOffset, RenderObject* inSubtreePaintRoot = nullptr, OverlapTestRequestMap* inOverlapTestRequests = nullptr, bool inRequireSecurityOriginAccessForWidgets = false)
: rootLayer(inRootLayer)
, subtreePaintRoot(inSubtreePaintRoot)
, paintDirtyRect(inDirtyRect)
, subpixelOffset(inSubpixelOffset)
, overlapTestRequests(inOverlapTestRequests)
, paintBehavior(inPaintBehavior)
, requireSecurityOriginAccessForWidgets(inRequireSecurityOriginAccessForWidgets)
{ }
RenderLayer* rootLayer;
RenderObject* subtreePaintRoot; // Only paint descendants of this object.
LayoutRect paintDirtyRect; // Relative to rootLayer;
LayoutSize subpixelOffset;
OverlapTestRequestMap* overlapTestRequests; // May be null.
PaintBehavior paintBehavior;
bool requireSecurityOriginAccessForWidgets;
bool clipToDirtyRect { true };
};
// Compute, cache and return clip rects computed with the given layer as the root.
Ref<ClipRects> updateClipRects(const ClipRectsContext&);
// Compute and return the clip rects. If useCached is true, will used previously computed clip rects on ancestors
// (rather than computing them all from scratch up the parent chain).
void calculateClipRects(const ClipRectsContext&, ClipRects&) const;
ClipRects* clipRects(const ClipRectsContext&) const;
void updateZOrderLists();
void rebuildZOrderLists();
void rebuildZOrderLists(CollectLayersBehavior, std::unique_ptr<Vector<RenderLayer*>>&, std::unique_ptr<Vector<RenderLayer*>>&);
void clearZOrderLists();
void updateNormalFlowList();
// Non-auto z-index always implies stacking context here, because StyleResolver::adjustRenderStyle already adjusts z-index
// based on positioning and other criteria.
bool isStackingContext(const RenderStyle* style) const { return !style->hasAutoZIndex() || isRenderViewLayer() || m_forcedStackingContext; }
bool isDirtyStackingContainer() const { return m_zOrderListsDirty && isStackingContainer(); }
void setAncestorChainHasSelfPaintingLayerDescendant();
void dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
bool acceleratedCompositingForOverflowScrollEnabled() const;
void updateDescendantsAreContiguousInStackingOrder();
void updateDescendantsAreContiguousInStackingOrderRecursive(const HashMap<const RenderLayer*, int>&, int& minIndex, int& maxIndex, int& count, bool firstIteration);
void computeRepaintRects(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* = nullptr);
void computeRepaintRectsIncludingDescendants();
void clearRepaintRects();
LayoutRect clipRectRelativeToAncestor(RenderLayer* ancestor, LayoutSize offsetFromAncestor, const LayoutRect& constrainingRect) const;
void clipToRect(GraphicsContext&, const LayerPaintingInfo&, const ClipRect&, BorderRadiusClippingRule = IncludeSelfForBorderRadius);
void restoreClip(GraphicsContext&, const LayerPaintingInfo&, const ClipRect&);
bool shouldRepaintAfterLayout() const;
void updateSelfPaintingLayer();
void updateStackingContextsAfterStyleChange(const RenderStyle* oldStyle);
void updateScrollbarsAfterStyleChange(const RenderStyle* oldStyle);
void updateScrollbarsAfterLayout();
void setAncestorChainHasOutOfFlowPositionedDescendant(RenderBlock* containingBlock);
void dirtyAncestorChainHasOutOfFlowPositionedDescendantStatus();
void updateOutOfFlowPositioned(const RenderStyle* oldStyle);
void updateNeedsCompositedScrolling();
// Returns true if the position changed.
bool updateLayerPosition();
void updateLayerPositions(RenderGeometryMap* = nullptr, UpdateLayerPositionsFlags = defaultFlags);
enum UpdateLayerPositionsAfterScrollFlag {
NoFlag = 0,
IsOverflowScroll = 1 << 0,
HasSeenViewportConstrainedAncestor = 1 << 1,
HasSeenAncestorWithOverflowClip = 1 << 2,
HasChangedAncestor = 1 << 3
};
typedef unsigned UpdateLayerPositionsAfterScrollFlags;
void updateLayerPositionsAfterScroll(RenderGeometryMap*, UpdateLayerPositionsAfterScrollFlags = NoFlag);
ScrollOffset clampScrollOffset(const ScrollOffset&) const;
RenderLayer* enclosingPaginationLayerInSubtree(const RenderLayer* rootLayer, PaginationInclusionMode) const;
void setNextSibling(RenderLayer* next) { m_next = next; }
void setPreviousSibling(RenderLayer* prev) { m_previous = prev; }
void setParent(RenderLayer* parent);
void setFirstChild(RenderLayer* first) { m_first = first; }
void setLastChild(RenderLayer* last) { m_last = last; }
LayoutPoint renderBoxLocation() const { return is<RenderBox>(renderer()) ? downcast<RenderBox>(renderer()).location() : LayoutPoint(); }
void collectLayers(bool includeHiddenLayers, CollectLayersBehavior, std::unique_ptr<Vector<RenderLayer*>>&, std::unique_ptr<Vector<RenderLayer*>>&);
void updateCompositingAndLayerListsIfNeeded();
bool setupFontSubpixelQuantization(GraphicsContext&, bool& didQuantizeFonts);
Path computeClipPath(const LayoutSize& offsetFromRoot, LayoutRect& rootRelativeBounds, WindRule&) const;
bool setupClipPath(GraphicsContext&, const LayerPaintingInfo&, const LayoutSize& offsetFromRoot, LayoutRect& rootRelativeBounds, bool& rootRelativeBoundsComputed);
class FilterInfo;
std::pair<FilterInfo*, std::unique_ptr<FilterEffectRendererHelper>> filterPainter(GraphicsContext&, PaintLayerFlags) const;
bool hasFilterThatIsPainting(GraphicsContext&, PaintLayerFlags) const;
std::unique_ptr<FilterEffectRendererHelper> setupFilters(GraphicsContext&, LayerPaintingInfo&, PaintLayerFlags, const LayoutSize& offsetFromRoot, LayoutRect& rootRelativeBounds, bool& rootRelativeBoundsComputed);
void applyFilters(FilterEffectRendererHelper*, GraphicsContext& originalContext, const LayerPaintingInfo&, const LayerFragments&);
void paintLayer(GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags);
void paintLayerContentsAndReflection(GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags);
void paintLayerByApplyingTransform(GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags, const LayoutSize& translationOffset = LayoutSize());
void paintLayerContents(GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags);
void paintList(Vector<RenderLayer*>*, GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags);
void updatePaintingInfoForFragments(LayerFragments&, const LayerPaintingInfo&, PaintLayerFlags, bool shouldPaintContent, const LayoutSize& offsetFromRoot);
void paintBackgroundForFragments(const LayerFragments&, GraphicsContext&, GraphicsContext& transparencyLayerContext,
const LayoutRect& transparencyPaintDirtyRect, bool haveTransparency, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintForegroundForFragments(const LayerFragments&, GraphicsContext&, GraphicsContext& transparencyLayerContext,
const LayoutRect& transparencyPaintDirtyRect, bool haveTransparency, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintForegroundForFragmentsWithPhase(PaintPhase, const LayerFragments&, GraphicsContext&, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintOutlineForFragments(const LayerFragments&, GraphicsContext&, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintOverflowControlsForFragments(const LayerFragments&, GraphicsContext&, const LayerPaintingInfo&);
void paintMaskForFragments(const LayerFragments&, GraphicsContext&, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintChildClippingMaskForFragments(const LayerFragments&, GraphicsContext&, const LayerPaintingInfo&, PaintBehavior, RenderObject* paintingRootForRenderer);
void paintTransformedLayerIntoFragments(GraphicsContext&, const LayerPaintingInfo&, PaintLayerFlags);
RenderLayer* transparentPaintingAncestor();
void beginTransparencyLayers(GraphicsContext&, const LayerPaintingInfo&, const LayoutRect& dirtyRect);
RenderLayer* hitTestLayer(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation&, bool appliedTransform,
const HitTestingTransformState* = nullptr, double* zOffset = nullptr);
RenderLayer* hitTestLayerByApplyingTransform(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest&, HitTestResult&,
const LayoutRect& hitTestRect, const HitTestLocation&, const HitTestingTransformState* = nullptr, double* zOffset = nullptr,
const LayoutSize& translationOffset = LayoutSize());
RenderLayer* hitTestList(Vector<RenderLayer*>*, RenderLayer* rootLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation&,
const HitTestingTransformState*, double* zOffsetForDescendants, double* zOffset,
const HitTestingTransformState* unflattenedTransformState, bool depthSortDescendants);
Ref<HitTestingTransformState> createLocalTransformState(RenderLayer* rootLayer, RenderLayer* containerLayer,
const LayoutRect& hitTestRect, const HitTestLocation&,
const HitTestingTransformState* containerTransformState,
const LayoutSize& translationOffset = LayoutSize()) const;
bool hitTestContents(const HitTestRequest&, HitTestResult&, const LayoutRect& layerBounds, const HitTestLocation&, HitTestFilter) const;
bool hitTestContentsForFragments(const LayerFragments&, const HitTestRequest&, HitTestResult&, const HitTestLocation&, HitTestFilter, bool& insideClipRect) const;
bool hitTestResizerInFragments(const LayerFragments&, const HitTestLocation&) const;
RenderLayer* hitTestTransformedLayerInFragments(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest&, HitTestResult&,
const LayoutRect& hitTestRect, const HitTestLocation&, const HitTestingTransformState* = nullptr, double* zOffset = nullptr);
bool listBackgroundIsKnownToBeOpaqueInRect(const Vector<RenderLayer*>*, const LayoutRect&) const;
void computeScrollDimensions();
bool hasHorizontalOverflow() const;
bool hasVerticalOverflow() const;
bool hasScrollableHorizontalOverflow() const;
bool hasScrollableVerticalOverflow() const;
bool showsOverflowControls() const;
bool shouldBeNormalFlowOnly() const;
bool shouldBeSelfPaintingLayer() const;
int scrollOffset(ScrollbarOrientation) const override;
// ScrollableArea interface
void invalidateScrollbarRect(Scrollbar&, const IntRect&) override;
void invalidateScrollCornerRect(const IntRect&) override;
bool isActive() const override;
bool isScrollCornerVisible() const override;
IntRect scrollCornerRect() const override;
IntRect convertFromScrollbarToContainingView(const Scrollbar&, const IntRect&) const override;
IntRect convertFromContainingViewToScrollbar(const Scrollbar&, const IntRect&) const override;
IntPoint convertFromScrollbarToContainingView(const Scrollbar&, const IntPoint&) const override;
IntPoint convertFromContainingViewToScrollbar(const Scrollbar&, const IntPoint&) const override;
int scrollSize(ScrollbarOrientation) const override;
void setScrollOffset(const ScrollOffset&) override;
IntRect visibleContentRectInternal(VisibleContentRectIncludesScrollbars, VisibleContentRectBehavior) const override;
IntSize visibleSize() const override;
IntSize contentsSize() const override;
IntSize overhangAmount() const override;
IntPoint lastKnownMousePosition() const override;
bool isHandlingWheelEvent() const override;
bool shouldSuspendScrollAnimations() const override;
IntRect scrollableAreaBoundingBox(bool* isInsideFixed = nullptr) const override;
bool isRubberBandInProgress() const override;
bool forceUpdateScrollbarsOnMainThreadForPerformanceTesting() const override;
#if ENABLE(CSS_SCROLL_SNAP)
bool isScrollSnapInProgress() const override;
#endif
bool usesMockScrollAnimator() const override;
void logMockScrollAnimatorMessage(const String&) const override;
#if PLATFORM(IOS)
void registerAsTouchEventListenerForScrolling();
void unregisterAsTouchEventListenerForScrolling();
#endif
// Rectangle encompassing the scroll corner and resizer rect.
LayoutRect scrollCornerAndResizerRect() const;
// NOTE: This should only be called by the overriden setScrollOffset from ScrollableArea.
void scrollTo(const ScrollPosition&);
void updateCompositingLayersAfterScroll();
IntSize scrollbarOffset(const Scrollbar&) const;
void updateScrollableAreaSet(bool hasOverflow);
bool allowsCurrentScroll() const;
void dirtyAncestorChainVisibleDescendantStatus();
void setAncestorChainHasVisibleDescendant();
void updateDescendantDependentFlags(HashSet<const RenderObject*>* outOfFlowDescendantContainingBlocks = nullptr);
bool has3DTransformedDescendant() const { return m_has3DTransformedDescendant; }
bool hasTransformedAncestor() const { return m_hasTransformedAncestor; }
bool has3DTransformedAncestor() const { return m_has3DTransformedAncestor; }
void dirty3DTransformedDescendantStatus();
// Both updates the status, and returns true if descendants of this have 3d.
bool update3DTransformedDescendantStatus();
void createReflection();
void removeReflection();
RenderStyle createReflectionStyle();
bool paintingInsideReflection() const { return m_paintingInsideReflection; }
void setPaintingInsideReflection(bool b) { m_paintingInsideReflection = b; }
void updateOrRemoveFilterClients();
void updateOrRemoveFilterEffectRenderer();
#if ENABLE(CSS_COMPOSITING)
void updateAncestorChainHasBlendingDescendants();
void dirtyAncestorChainHasBlendingDescendants();
#endif
Ref<ClipRects> parentClipRects(const ClipRectsContext&) const;
ClipRect backgroundClipRect(const ClipRectsContext&) const;
RenderLayer* enclosingTransformedAncestor() const;
LayoutRect getRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, bool insideFixed, const ScrollAlignment& alignX, const ScrollAlignment& alignY) const;
// Convert a point in absolute coords into layer coords, taking transforms into account
LayoutPoint absoluteToContents(const LayoutPoint&) const;
void positionOverflowControls(const IntSize&);
void updateScrollCornerStyle();
void clearScrollCorner();
void updateResizerStyle();
void clearResizer();
void drawPlatformResizerImage(GraphicsContext&, const LayoutRect& resizerCornerRect);
void updatePagination();
void setHasCompositingDescendant(bool b) { m_hasCompositingDescendant = b; }
enum class IndirectCompositingReason {
None,
Stacking,
Overlap,
BackgroundLayer,
GraphicalEffect, // opacity, mask, filter, transform etc.
Perspective,
Preserve3D
};
void setIndirectCompositingReason(IndirectCompositingReason reason) { m_indirectCompositingReason = static_cast<unsigned>(reason); }
IndirectCompositingReason indirectCompositingReason() const { return static_cast<IndirectCompositingReason>(m_indirectCompositingReason); }
bool mustCompositeForIndirectReasons() const { return m_indirectCompositingReason; }
// Returns true if z ordering would not change if this layer were a stacking container.
bool canBeStackingContainer() const;
friend class RenderLayerBacking;
friend class RenderLayerCompositor;
friend class RenderLayerModelObject;
LayoutUnit overflowTop() const;
LayoutUnit overflowBottom() const;
LayoutUnit overflowLeft() const;
LayoutUnit overflowRight() const;
IntRect rectForHorizontalScrollbar(const IntRect& borderBoxRect) const;
IntRect rectForVerticalScrollbar(const IntRect& borderBoxRect) const;
LayoutUnit verticalScrollbarStart(int minX, int maxX) const;
LayoutUnit horizontalScrollbarStart(int minX) const;
bool overflowControlsIntersectRect(const IntRect& localRect) const;
// The bitfields are up here so they will fall into the padding from ScrollableArea on 64-bit.
const bool m_isRenderViewLayer : 1;
const bool m_forcedStackingContext : 1;
// Keeps track of whether the layer is currently resizing, so events can cause resizing to start and stop.
bool m_inResizeMode : 1;
bool m_scrollDimensionsDirty : 1;
bool m_zOrderListsDirty : 1;
bool m_normalFlowListDirty: 1;
bool m_isNormalFlowOnly : 1;
bool m_isSelfPaintingLayer : 1;
// If have no self-painting descendants, we don't have to walk our children during painting. This can lead to
// significant savings, especially if the tree has lots of non-self-painting layers grouped together (e.g. table cells).
bool m_hasSelfPaintingLayerDescendant : 1;
bool m_hasSelfPaintingLayerDescendantDirty : 1;
// If we have no out of flow positioned descendants and no non-descendant
// appears between our descendants in stacking order, then we may become a
// stacking context.
bool m_hasOutOfFlowPositionedDescendant : 1;
bool m_hasOutOfFlowPositionedDescendantDirty : 1;
bool m_needsCompositedScrolling : 1;
// If this is true, then no non-descendant appears between any of our
// descendants in stacking order. This is one of the requirements of being
// able to safely become a stacking context.
bool m_descendantsAreContiguousInStackingOrder : 1;
bool m_usedTransparency : 1; // Tracks whether we need to close a transparent layer, i.e., whether
// we ended up painting this layer or any descendants (and therefore need to
// blend).
bool m_paintingInsideReflection : 1; // A state bit tracking if we are painting inside a replica.
bool m_inOverflowRelayout : 1;
unsigned m_repaintStatus : 2; // RepaintStatus
bool m_visibleContentStatusDirty : 1;
bool m_hasVisibleContent : 1;
bool m_visibleDescendantStatusDirty : 1;
bool m_hasVisibleDescendant : 1;
bool m_registeredScrollableArea : 1;
bool m_3DTransformedDescendantStatusDirty : 1;
bool m_has3DTransformedDescendant : 1; // Set on a stacking context layer that has 3D descendants anywhere
// in a preserves3D hierarchy. Hint to do 3D-aware hit testing.
bool m_hasCompositingDescendant : 1; // In the z-order tree.
bool m_hasTransformedAncestor : 1;
bool m_has3DTransformedAncestor : 1;
unsigned m_indirectCompositingReason : 3;
unsigned m_viewportConstrainedNotCompositedReason : 2;
#if PLATFORM(IOS)
bool m_adjustForIOSCaretWhenScrolling : 1;
#if ENABLE(IOS_TOUCH_EVENTS)
bool m_registeredAsTouchEventListenerForScrolling : 1;
#endif
bool m_inUserScroll : 1;
bool m_requiresScrollBoundsOriginUpdate : 1;
#endif
bool m_containsDirtyOverlayScrollbars : 1;
bool m_updatingMarqueePosition : 1;
#if !ASSERT_DISABLED
bool m_layerListMutationAllowed : 1;
#endif
bool m_hasFilterInfo : 1;
#if ENABLE(CSS_COMPOSITING)
unsigned m_blendMode : 5;
bool m_hasNotIsolatedCompositedBlendingDescendants : 1;
bool m_hasNotIsolatedBlendingDescendants : 1;
bool m_hasNotIsolatedBlendingDescendantsStatusDirty : 1;
#endif
RenderLayerModelObject& m_renderer;
RenderLayer* m_parent;
RenderLayer* m_previous;
RenderLayer* m_next;
RenderLayer* m_first;
RenderLayer* m_last;
// Our current relative position offset.
LayoutSize m_offsetForInFlowPosition;
// Our (x,y) coordinates are in our parent layer's coordinate space.
LayoutPoint m_topLeft;
// The layer's width/height
IntSize m_layerSize;
ScrollPosition m_scrollPosition;
std::optional<ScrollPosition> m_postLayoutScrollPosition;
// The width/height of our scrolled area.
IntSize m_scrollSize;
// For layers with overflow, we have a pair of scrollbars.
RefPtr<Scrollbar> m_hBar;
RefPtr<Scrollbar> m_vBar;
// For layers that establish stacking contexts, m_posZOrderList holds a sorted list of all the
// descendant layers within the stacking context that have z-indices of 0 or greater
// (auto will count as 0). m_negZOrderList holds descendants within our stacking context with negative
// z-indices.
std::unique_ptr<Vector<RenderLayer*>> m_posZOrderList;
std::unique_ptr<Vector<RenderLayer*>> m_negZOrderList;
// This list contains child layers that cannot create stacking contexts. For now it is just
// overflow layers, but that may change in the future.
std::unique_ptr<Vector<RenderLayer*>> m_normalFlowList;
std::unique_ptr<ClipRectsCache> m_clipRectsCache;
IntPoint m_cachedOverlayScrollbarOffset;
std::unique_ptr<RenderMarquee> m_marquee; // Used for <marquee>.
// Cached normal flow values for absolute positioned elements with static left/top values.
LayoutUnit m_staticInlinePosition;
LayoutUnit m_staticBlockPosition;
std::unique_ptr<TransformationMatrix> m_transform;
// May ultimately be extended to many replicas (with their own paint order).
RenderPtr<RenderReplica> m_reflection;
// Renderers to hold our custom scroll corner and resizer.
RenderPtr<RenderScrollbarPart> m_scrollCorner;
RenderPtr<RenderScrollbarPart> m_resizer;
// Pointer to the enclosing RenderLayer that caused us to be paginated. It is 0 if we are not paginated.
RenderLayer* m_enclosingPaginationLayer;
IntRect m_blockSelectionGapsBounds;
std::unique_ptr<RenderLayerBacking> m_backing;
std::unique_ptr<PaintFrequencyInfo> m_paintFrequencyInfo;
};
inline void RenderLayer::clearZOrderLists()
{
ASSERT(!isStackingContainer());
ASSERT(m_layerListMutationAllowed);
m_posZOrderList = nullptr;
m_negZOrderList = nullptr;
}
inline void RenderLayer::updateZOrderLists()
{
if (!m_zOrderListsDirty)
return;
if (!isStackingContainer()) {
clearZOrderLists();
m_zOrderListsDirty = false;
return;
}
rebuildZOrderLists();
}
#if !ASSERT_DISABLED
class LayerListMutationDetector {
public:
LayerListMutationDetector(RenderLayer* layer)
: m_layer(layer)
, m_previousMutationAllowedState(layer->layerListMutationAllowed())
{
m_layer->setLayerListMutationAllowed(false);
}
~LayerListMutationDetector()
{
m_layer->setLayerListMutationAllowed(m_previousMutationAllowedState);
}
private:
RenderLayer* m_layer;
bool m_previousMutationAllowedState;
};
#endif
void makeMatrixRenderable(TransformationMatrix&, bool has3DRendering);
bool compositedWithOwnBackingStore(const RenderLayer&);
WTF::TextStream& operator<<(WTF::TextStream&, const RenderLayer&);
} // namespace WebCore
#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from lldb.
void showLayerTree(const WebCore::RenderLayer*);
void showLayerTree(const WebCore::RenderObject*);
#endif