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RenderBox.cpp
5762 lines (4941 loc) · 276 KB
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RenderBox.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005-2023 Apple Inc. All rights reserved.
* Copyright (C) 2015-2018 Google Inc. All rights reserved.
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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.
*
*/
#include "config.h"
#include "RenderBox.h"
#include "BackgroundPainter.h"
#include "BorderPainter.h"
#include "CSSFontSelector.h"
#include "ControlStates.h"
#include "Document.h"
#include "Editing.h"
#include "EventHandler.h"
#include "FloatQuad.h"
#include "FloatRoundedRect.h"
#include "FontBaseline.h"
#include "GraphicsContext.h"
#include "HTMLBodyElement.h"
#include "HTMLButtonElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLImageElement.h"
#include "HTMLInputElement.h"
#include "HTMLLegendElement.h"
#include "HTMLNames.h"
#include "HTMLSelectElement.h"
#include "HTMLTextAreaElement.h"
#include "HitTestResult.h"
#include "InlineIteratorInlineBox.h"
#include "InlineIteratorLineBox.h"
#include "InlineRunAndOffset.h"
#include "LayoutIntegrationLineLayout.h"
#include "LocalFrame.h"
#include "LocalFrameView.h"
#include "Page.h"
#include "PaintInfo.h"
#include "PathOperation.h"
#include "RenderBoxFragmentInfo.h"
#include "RenderChildIterator.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderFragmentContainer.h"
#include "RenderGeometryMap.h"
#include "RenderGrid.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayerCompositor.h"
#include "RenderLayerScrollableArea.h"
#include "RenderLayoutState.h"
#include "RenderMultiColumnFlow.h"
#include "RenderSVGResourceClipper.h"
#include "RenderTableCell.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "ResizeObserverSize.h"
#include "RuntimeApplicationChecks.h"
#include "SVGClipPathElement.h"
#include "SVGElementTypeHelpers.h"
#include "ScrollAnimator.h"
#include "ScrollbarTheme.h"
#include "Settings.h"
#include "StyleScrollSnapPoints.h"
#include "TextDirection.h"
#include "TransformState.h"
#include <algorithm>
#include <math.h>
#include <wtf/Assertions.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/StackStats.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderBox);
struct SameSizeAsRenderBox : public RenderBoxModelObject {
virtual ~SameSizeAsRenderBox() = default;
LayoutRect frameRect;
LayoutBoxExtent marginBox;
LayoutUnit preferredLogicalWidths[2];
void* pointers[2];
};
static_assert(sizeof(RenderBox) == sizeof(SameSizeAsRenderBox), "RenderBox should stay small");
using namespace HTMLNames;
typedef HashMap<const RenderBox*, LayoutUnit> OverrideSizeMap;
static OverrideSizeMap* gOverridingLogicalHeightMap = nullptr;
static OverrideSizeMap* gOverridingLogicalWidthMap = nullptr;
typedef HashMap<const RenderBox*, Length> OverridingLengthMap;
static OverridingLengthMap* gOverridingLogicalHeightLengthMap = nullptr;
static OverridingLengthMap* gOverridingLogicalWidthLengthMap = nullptr;
// FIXME: We should store these based on physical direction.
typedef HashMap<const RenderBox*, std::optional<LayoutUnit>> OverrideOptionalSizeMap;
static OverrideOptionalSizeMap* gOverridingContainingBlockContentLogicalHeightMap = nullptr;
static OverrideOptionalSizeMap* gOverridingContainingBlockContentLogicalWidthMap = nullptr;
// Size of border belt for autoscroll. When mouse pointer in border belt,
// autoscroll is started.
static const int autoscrollBeltSize = 20;
static const unsigned backgroundObscurationTestMaxDepth = 4;
using ControlStatesRendererMap = HashMap<const RenderObject*, std::unique_ptr<ControlStates>>;
static ControlStatesRendererMap& controlStatesRendererMap()
{
static NeverDestroyed<ControlStatesRendererMap> map;
return map;
}
static ControlStates* controlStatesForRenderer(const RenderBox& renderer)
{
return controlStatesRendererMap().ensure(&renderer, [] {
return makeUnique<ControlStates>();
}).iterator->value.get();
}
static void removeControlStatesForRenderer(const RenderBox& renderer)
{
controlStatesRendererMap().remove(&renderer);
}
bool RenderBox::s_hadNonVisibleOverflow = false;
RenderBox::RenderBox(Element& element, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBoxModelObject(element, WTFMove(style), baseTypeFlags)
{
setIsBox();
}
RenderBox::RenderBox(Document& document, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBoxModelObject(document, WTFMove(style), baseTypeFlags)
{
setIsBox();
}
RenderBox::~RenderBox()
{
// Do not add any code here. Add it to willBeDestroyed() instead.
}
void RenderBox::willBeDestroyed()
{
if (frame().eventHandler().autoscrollRenderer() == this)
frame().eventHandler().stopAutoscrollTimer(true);
clearOverridingContentSize();
clearOverridingContainingBlockContentSize();
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
ShapeOutsideInfo::removeInfo(*this);
view().unscheduleLazyRepaint(*this);
removeControlStatesForRenderer(*this);
if (hasInitializedStyle()) {
if (style().hasSnapPosition())
view().unregisterBoxWithScrollSnapPositions(*this);
if (style().containerType() != ContainerType::Normal)
view().unregisterContainerQueryBox(*this);
}
RenderBoxModelObject::willBeDestroyed();
}
RenderFragmentContainer* RenderBox::clampToStartAndEndFragments(RenderFragmentContainer* fragment) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
ASSERT(isRenderView() || (fragment && fragmentedFlow));
if (isRenderView())
return fragment;
// We need to clamp to the block, since we want any lines or blocks that overflow out of the
// logical top or logical bottom of the block to size as though the border box in the first and
// last fragments extended infinitely. Otherwise the lines are going to size according to the fragments
// they overflow into, which makes no sense when this block doesn't exist in |fragment| at all.
RenderFragmentContainer* startFragment = nullptr;
RenderFragmentContainer* endFragment = nullptr;
if (!fragmentedFlow->getFragmentRangeForBox(this, startFragment, endFragment))
return fragment;
if (fragment->logicalTopForFragmentedFlowContent() < startFragment->logicalTopForFragmentedFlowContent())
return startFragment;
if (fragment->logicalTopForFragmentedFlowContent() > endFragment->logicalTopForFragmentedFlowContent())
return endFragment;
return fragment;
}
bool RenderBox::hasFragmentRangeInFragmentedFlow() const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (!fragmentedFlow || !fragmentedFlow->hasValidFragmentInfo())
return false;
return fragmentedFlow->hasCachedFragmentRangeForBox(*this);
}
LayoutRect RenderBox::clientBoxRectInFragment(RenderFragmentContainer* fragment) const
{
if (!fragment)
return clientBoxRect();
LayoutRect clientBox = borderBoxRectInFragment(fragment);
clientBox.setLocation(clientBox.location() + LayoutSize(borderLeft(), borderTop()));
clientBox.setSize(clientBox.size() - LayoutSize(borderLeft() + borderRight() + verticalScrollbarWidth(), borderTop() + borderBottom() + horizontalScrollbarHeight()));
return clientBox;
}
LayoutRect RenderBox::borderBoxRectInFragment(RenderFragmentContainer*, RenderBoxFragmentInfoFlags) const
{
return borderBoxRect();
}
static RenderBlockFlow* outermostBlockContainingFloatingObject(RenderBox& box)
{
ASSERT(box.isFloating());
RenderBlockFlow* parentBlock = nullptr;
for (auto& ancestor : ancestorsOfType<RenderBlockFlow>(box)) {
if (!parentBlock || ancestor.containsFloat(box))
parentBlock = &ancestor;
}
return parentBlock;
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (renderTreeBeingDestroyed())
return;
if (isFloating()) {
if (RenderBlockFlow* parentBlock = outermostBlockContainingFloatingObject(*this)) {
parentBlock->markSiblingsWithFloatsForLayout(this);
parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(*this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
s_hadNonVisibleOverflow = hasNonVisibleOverflow();
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
if (oldStyle) {
// The background of the root element or the body element could propagate up to
// the canvas. Issue full repaint, when our style changes substantially.
if (diff >= StyleDifference::Repaint && (isDocumentElementRenderer() || isBody())) {
view().repaintRootContents();
if (oldStyle->hasEntirelyFixedBackground() != newStyle.hasEntirelyFixedBackground())
view().compositor().rootLayerConfigurationChanged();
}
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifference::Layout && parent() && oldStyle->position() != newStyle.position()) {
if (!oldStyle->hasOutOfFlowPosition() && newStyle.hasOutOfFlowPosition()) {
// We are about to go out of flow. Before that takes place, we need to mark the
// current containing block chain for preferred widths recalculation.
setNeedsLayoutAndPrefWidthsRecalc();
} else
markContainingBlocksForLayout();
if (oldStyle->position() != PositionType::Static && newStyle.hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
if (isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (isBody())
view().repaintRootContents();
bool boxContributesSnapPositions = newStyle.hasSnapPosition();
if (boxContributesSnapPositions || (oldStyle && oldStyle->hasSnapPosition())) {
if (boxContributesSnapPositions)
view().registerBoxWithScrollSnapPositions(*this);
else
view().unregisterBoxWithScrollSnapPositions(*this);
}
if (newStyle.containerType() != ContainerType::Normal)
view().registerContainerQueryBox(*this);
else if (oldStyle && oldStyle->containerType() != ContainerType::Normal)
view().unregisterContainerQueryBox(*this);
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// Horizontal writing mode definition is updated in RenderBoxModelObject::updateFromStyle,
// (as part of the RenderBoxModelObject::styleDidChange call below). So, we can safely cache the horizontal
// writing mode value before style change here.
bool oldHorizontalWritingMode = isHorizontalWritingMode();
RenderBoxModelObject::styleDidChange(diff, oldStyle);
const RenderStyle& newStyle = style();
if (needsLayout() && oldStyle) {
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isOutOfFlowPositioned() && newStyle.hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != newStyle.marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
if (RenderBlock::hasPercentHeightContainerMap() && firstChild()
&& oldHorizontalWritingMode != isHorizontalWritingMode())
RenderBlock::clearPercentHeightDescendantsFrom(*this);
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasNonVisibleOverflow() && layer() && oldStyle && oldStyle->effectiveZoom() != newStyle.effectiveZoom()) {
if (auto* scrollableArea = layer()->scrollableArea()) {
ScrollPosition scrollPosition = scrollableArea->scrollPosition();
float zoomScaleFactor = newStyle.effectiveZoom() / oldStyle->effectiveZoom();
scrollPosition.scale(zoomScaleFactor);
scrollableArea->setPostLayoutScrollPosition(scrollPosition);
}
}
// Our opaqueness might have changed without triggering layout.
if (diff >= StyleDifference::Repaint && diff <= StyleDifference::RepaintLayer) {
auto parentToInvalidate = parent();
for (unsigned i = 0; i < backgroundObscurationTestMaxDepth && parentToInvalidate; ++i) {
parentToInvalidate->invalidateBackgroundObscurationStatus();
parentToInvalidate = parentToInvalidate->parent();
}
}
bool isBodyRenderer = isBody();
bool isDocElementRenderer = isDocumentElementRenderer();
if (isDocElementRenderer || isBodyRenderer) {
#if ENABLE(DARK_MODE_CSS)
view().frameView().recalculateBaseBackgroundColor();
#endif
view().frameView().recalculateScrollbarOverlayStyle();
if (diff != StyleDifference::Equal)
view().compositor().rootOrBodyStyleChanged(*this, oldStyle);
}
if ((oldStyle && oldStyle->shapeOutside()) || style().shapeOutside())
updateShapeOutsideInfoAfterStyleChange(style(), oldStyle);
updateGridPositionAfterStyleChange(style(), oldStyle);
// Changing the position from/to absolute can potentially create/remove flex/grid items, as absolutely positioned
// children of a flex/grid box are out-of-flow, and thus, not flex/grid items. This means that we need to clear
// any override content size set by our container, because it would likely be incorrect after the style change.
if (isOutOfFlowPositioned() && parent() && parent()->style().isDisplayFlexibleBoxIncludingDeprecatedOrGridBox())
clearOverridingContentSize();
if (auto* lineLayout = LayoutIntegration::LineLayout::containing(*this))
lineLayout->updateStyle(*this, *oldStyle);
}
void RenderBox::updateGridPositionAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
if (!oldStyle || !is<RenderGrid>(parent()))
return;
if (oldStyle->gridItemColumnStart() == style.gridItemColumnStart()
&& oldStyle->gridItemColumnEnd() == style.gridItemColumnEnd()
&& oldStyle->gridItemRowStart() == style.gridItemRowStart()
&& oldStyle->gridItemRowEnd() == style.gridItemRowEnd()
&& oldStyle->order() == style.order()
&& oldStyle->hasOutOfFlowPosition() == style.hasOutOfFlowPosition())
return;
// Positioned items don't participate on the layout of the grid,
// so we don't need to mark the grid as dirty if they change positions.
if (oldStyle->hasOutOfFlowPosition() && style.hasOutOfFlowPosition())
return;
// It should be possible to not dirty the grid in some cases (like moving an
// explicitly placed grid item).
// For now, it's more simple to just always recompute the grid.
downcast<RenderGrid>(*parent()).dirtyGrid();
}
void RenderBox::updateShapeOutsideInfoAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
const ShapeValue* shapeOutside = style.shapeOutside();
const ShapeValue* oldShapeOutside = oldStyle ? oldStyle->shapeOutside() : nullptr;
Length shapeMargin = style.shapeMargin();
Length oldShapeMargin = oldStyle ? oldStyle->shapeMargin() : RenderStyle::initialShapeMargin();
float shapeImageThreshold = style.shapeImageThreshold();
float oldShapeImageThreshold = oldStyle ? oldStyle->shapeImageThreshold() : RenderStyle::initialShapeImageThreshold();
// FIXME: A future optimization would do a deep comparison for equality. (bug 100811)
if (shapeOutside == oldShapeOutside && shapeMargin == oldShapeMargin && shapeImageThreshold == oldShapeImageThreshold)
return;
if (!shapeOutside)
ShapeOutsideInfo::removeInfo(*this);
else
ShapeOutsideInfo::ensureInfo(*this).markShapeAsDirty();
if (shapeOutside || shapeOutside != oldShapeOutside)
markShapeOutsideDependentsForLayout();
}
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
const RenderStyle& styleToUse = style();
bool isDocElementRenderer = isDocumentElementRenderer();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isDocElementRenderer || isViewObject)
setHasVisibleBoxDecorations(true);
setFloating(!isOutOfFlowPositioned() && styleToUse.isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (!(effectiveOverflowX() == Overflow::Visible && effectiveOverflowY() == Overflow::Visible) && !isDocElementRenderer && isRenderBlock()) {
bool boxHasNonVisibleOverflow = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
// (4) No containment is set either on the body or on the html document element.
auto& documentElement = *document().documentElement();
auto& documentElementRenderer = *documentElement.renderer();
if (is<HTMLHtmlElement>(documentElement)
&& document().body() == element()
&& documentElementRenderer.effectiveOverflowX() == Overflow::Visible
&& !styleToUse.effectiveContainment()
&& !documentElementRenderer.style().effectiveContainment()) {
boxHasNonVisibleOverflow = false;
}
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasNonVisibleOverflow) {
if (!s_hadNonVisibleOverflow && hasRenderOverflow()) {
// Erase the overflow.
// Overflow changes have to result in immediate repaints of the entire layout overflow area because
// repaints issued by removal of descendants get clipped using the updated style when they shouldn't.
issueRepaint(visualOverflowRect(), ClipRepaintToLayer::Yes, ForceRepaint::Yes);
issueRepaint(layoutOverflowRect(), ClipRepaintToLayer::Yes, ForceRepaint::Yes);
}
setHasNonVisibleOverflow();
}
}
setHasTransformRelatedProperty(styleToUse.hasTransformRelatedProperty());
setHasReflection(styleToUse.boxReflect());
}
void RenderBox::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
ASSERT(needsLayout());
RenderObject* child = firstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutStateMaintainer statePusher(*this, locationOffset(), style().isFlippedBlocksWritingMode());
while (child) {
if (child->needsLayout())
downcast<RenderElement>(*child).layout();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
invalidateBackgroundObscurationStatus();
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return paddingBoxWidth();
}
LayoutUnit RenderBox::clientHeight() const
{
return paddingBoxHeight();
}
int RenderBox::scrollWidth() const
{
if (hasPotentiallyScrollableOverflow() && layer())
return layer()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style().isLeftToRightDirection()) {
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientWidth(), layoutOverflowRect().maxX() - borderLeft()));
}
return roundToInt(clientWidth() - std::min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft()));
}
int RenderBox::scrollHeight() const
{
if (hasPotentiallyScrollableOverflow() && layer())
return layer()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientHeight(), layoutOverflowRect().maxY() - borderTop()));
}
int RenderBox::scrollLeft() const
{
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
return (hasNonVisibleOverflow() && scrollableArea) ? scrollableArea->scrollPosition().x() : 0;
}
int RenderBox::scrollTop() const
{
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
return (hasNonVisibleOverflow() && scrollableArea) ? scrollableArea->scrollPosition().y() : 0;
}
void RenderBox::resetLogicalHeightBeforeLayoutIfNeeded()
{
if (shouldResetLogicalHeightBeforeLayout() || (is<RenderBlock>(parent()) && downcast<RenderBlock>(*parent()).shouldResetChildLogicalHeightBeforeLayout(*this)))
setLogicalHeight(0_lu);
}
static void setupWheelEventMonitor(RenderLayerScrollableArea& scrollableArea)
{
Page& page = scrollableArea.layer().renderer().page();
if (!page.isMonitoringWheelEvents())
return;
scrollableArea.scrollAnimator().setWheelEventTestMonitor(page.wheelEventTestMonitor());
}
void RenderBox::setScrollLeft(int newLeft, const ScrollPositionChangeOptions& options)
{
if (!hasPotentiallyScrollableOverflow() || !layer())
return;
auto* scrollableArea = layer()->scrollableArea();
ASSERT(scrollableArea);
setupWheelEventMonitor(*scrollableArea);
scrollableArea->scrollToXPosition(newLeft, options);
}
void RenderBox::setScrollTop(int newTop, const ScrollPositionChangeOptions& options)
{
if (!hasPotentiallyScrollableOverflow() || !layer())
return;
auto* scrollableArea = layer()->scrollableArea();
ASSERT(scrollableArea);
setupWheelEventMonitor(*scrollableArea);
scrollableArea->scrollToYPosition(newTop, options);
}
void RenderBox::setScrollPosition(const ScrollPosition& position, const ScrollPositionChangeOptions& options)
{
if (!hasPotentiallyScrollableOverflow() || !layer())
return;
auto* scrollableArea = layer()->scrollableArea();
ASSERT(scrollableArea);
setupWheelEventMonitor(*scrollableArea);
scrollableArea->setScrollPosition(position, options);
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
rects.append(snappedIntRect(accumulatedOffset, size()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
RenderFragmentedFlow* fragmentedFlow = enclosingFragmentedFlow();
if (fragmentedFlow && fragmentedFlow->absoluteQuadsForBox(quads, wasFixed, this))
return;
auto localRect = FloatRect { 0, 0, width(), height() };
quads.append(localToAbsoluteQuad(localRect, UseTransforms, wasFixed));
}
void RenderBox::applyTransform(TransformationMatrix& t, const RenderStyle& style, const FloatRect& boundingBox, OptionSet<RenderStyle::TransformOperationOption> options) const
{
style.applyTransform(t, boundingBox, options);
}
void RenderBox::constrainLogicalMinMaxSizesByAspectRatio(LayoutUnit& computedMinSize, LayoutUnit& computedMaxSize, LayoutUnit computedSize, MinimumSizeIsAutomaticContentBased minimumSizeType, ConstrainDimension dimension) const
{
// TODO: Here we use isSpecified() to present the definite value. This is not quite correct, for the definite value should also include
// a size of the initial containing block and the “stretch-fit” sizing of non-replaced blocks if they have definite values.
// See https://www.w3.org/TR/css-sizing-3/#definite
const RenderStyle& styleToUse = style();
ASSERT(styleToUse.hasAspectRatio() || isRenderReplacedWithIntrinsicRatio());
auto logicalSize = dimension == ConstrainDimension::Width ? styleToUse.logicalWidth() : styleToUse.logicalHeight();
// https://www.w3.org/TR/css-sizing-4/#aspect-ratio-minimum
if (minimumSizeType == MinimumSizeIsAutomaticContentBased::Yes) {
// Only use Automatic Content-based Minimum Sizes in the ratio-dependent axis.
if (logicalSize.isSpecified())
computedMinSize = std::min(computedMinSize, computedSize);
computedMinSize = std::min(computedMinSize, computedMaxSize);
}
if (logicalSize.isSpecified())
return;
// Sizing constraints in either axis (the origin axis) should be transferred through the preferred aspect ratio. See https://www.w3.org/TR/css-sizing-4/#aspect-ratio-size-transfers
bool shouldCheckTransferredMinSize = dimension == ConstrainDimension::Width ? !styleToUse.logicalMinWidth().isSpecified() : !styleToUse.logicalMinHeight().isSpecified();
bool shouldCheckTransferredMaxSize = dimension == ConstrainDimension::Width ? !styleToUse.logicalMaxWidth().isSpecified() : !styleToUse.logicalMaxHeight().isSpecified();
if (!shouldCheckTransferredMaxSize && !shouldCheckTransferredMinSize)
return;
auto [transferredLogicalMinSize, transferredLogicalMaxSize] = dimension == ConstrainDimension::Width ? computeMinMaxLogicalWidthFromAspectRatio() : computeMinMaxLogicalHeightFromAspectRatio();
if (shouldCheckTransferredMaxSize && transferredLogicalMaxSize != LayoutUnit::max()) {
// The transferred max size should be floored by the definite minimum size.
if (!shouldCheckTransferredMinSize && minimumSizeType == MinimumSizeIsAutomaticContentBased::No)
transferredLogicalMaxSize = std::max(transferredLogicalMaxSize, computedMinSize);
computedMaxSize = std::min(computedMaxSize, transferredLogicalMaxSize);
if (minimumSizeType == MinimumSizeIsAutomaticContentBased::Yes)
computedMinSize = std::min(computedMinSize, computedMaxSize);
}
if (shouldCheckTransferredMinSize && transferredLogicalMinSize > LayoutUnit()) {
// The transferred min size should be capped by the definite maximum size.
if (!shouldCheckTransferredMaxSize)
transferredLogicalMinSize = std::min(transferredLogicalMinSize, computedMaxSize);
computedMinSize = std::max(computedMinSize, transferredLogicalMinSize);
}
}
LayoutUnit RenderBox::constrainLogicalWidthInFragmentByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock& cb, RenderFragmentContainer* fragment, AllowIntrinsic allowIntrinsic) const
{
const RenderStyle& styleToUse = style();
LayoutUnit computedMaxWidth = LayoutUnit::max();
if (!styleToUse.logicalMaxWidth().isUndefined() && (allowIntrinsic == AllowIntrinsic::Yes || !styleToUse.logicalMaxWidth().isIntrinsic()))
computedMaxWidth = computeLogicalWidthInFragmentUsing(MaxSize, styleToUse.logicalMaxWidth(), availableWidth, cb, fragment);
if (allowIntrinsic == AllowIntrinsic::No && styleToUse.logicalMinWidth().isIntrinsic())
return std::min(logicalWidth, computedMaxWidth);
auto logicalMinWidth = styleToUse.logicalMinWidth();
LayoutUnit computedMinWidth;
MinimumSizeIsAutomaticContentBased minimumSizeType = MinimumSizeIsAutomaticContentBased::No;
if (logicalMinWidth.isAuto() && shouldComputeLogicalWidthFromAspectRatio() && (styleToUse.logicalWidth().isAuto() || styleToUse.logicalWidth().isMinContent() || styleToUse.logicalWidth().isMaxContent()) && !is<RenderReplaced>(*this) && effectiveOverflowInlineDirection() == Overflow::Visible) {
// The automatic minimum size in the ratio-dependent axis is its min-content size. See https://www.w3.org/TR/css-sizing-4/#aspect-ratio-minimum
logicalMinWidth = Length(LengthType::MinContent);
minimumSizeType = MinimumSizeIsAutomaticContentBased::Yes;
}
computedMinWidth = computeLogicalWidthInFragmentUsing(MinSize, logicalMinWidth, availableWidth, cb, fragment);
if (styleToUse.hasAspectRatio())
constrainLogicalMinMaxSizesByAspectRatio(computedMinWidth, computedMaxWidth, logicalWidth, minimumSizeType, ConstrainDimension::Width);
logicalWidth = std::min(logicalWidth, computedMaxWidth);
return std::max(logicalWidth, computedMinWidth);
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const
{
const RenderStyle& styleToUse = style();
std::optional<LayoutUnit> computedLogicalMaxHeight;
if (!styleToUse.logicalMaxHeight().isUndefined())
computedLogicalMaxHeight = computeLogicalHeightUsing(MaxSize, styleToUse.logicalMaxHeight(), intrinsicContentHeight);
MinimumSizeIsAutomaticContentBased minimumSizeType = MinimumSizeIsAutomaticContentBased::No;
auto logicalMinHeight = styleToUse.logicalMinHeight();
if (logicalMinHeight.isAuto() && shouldComputeLogicalHeightFromAspectRatio() && intrinsicContentHeight && !is<RenderReplaced>(*this) && effectiveOverflowBlockDirection() == Overflow::Visible) {
auto heightFromAspectRatio = blockSizeFromAspectRatio(borderAndPaddingLogicalWidth(), borderAndPaddingLogicalHeight(), style().logicalAspectRatio(), style().boxSizingForAspectRatio(), logicalWidth(), style().aspectRatioType(), isRenderReplaced()) - borderAndPaddingLogicalHeight();
if (firstChild())
heightFromAspectRatio = std::max(heightFromAspectRatio, *intrinsicContentHeight);
logicalMinHeight = Length(heightFromAspectRatio, LengthType::Fixed);
minimumSizeType = MinimumSizeIsAutomaticContentBased::Yes;
}
if (logicalMinHeight.isMinContent() || logicalMinHeight.isMaxContent())
logicalMinHeight = Length();
std::optional<LayoutUnit> computedLogicalMinHeight = computeLogicalHeightUsing(MinSize, logicalMinHeight, intrinsicContentHeight);
LayoutUnit maxHeight = computedLogicalMaxHeight ? computedLogicalMaxHeight.value() : LayoutUnit::max();
LayoutUnit minHeight = computedLogicalMinHeight ? computedLogicalMinHeight.value() : LayoutUnit();
if (styleToUse.hasAspectRatio())
constrainLogicalMinMaxSizesByAspectRatio(minHeight, maxHeight, logicalHeight, minimumSizeType, ConstrainDimension::Height);
logicalHeight = std::min(logicalHeight, maxHeight);
return std::max(logicalHeight, minHeight);
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxHeight().isUndefined()) {
if (std::optional<LayoutUnit> maxH = computeContentLogicalHeight(MaxSize, styleToUse.logicalMaxHeight(), intrinsicContentHeight))
logicalHeight = std::min(logicalHeight, maxH.value());
}
if (std::optional<LayoutUnit> computedContentLogicalHeight = computeContentLogicalHeight(MinSize, styleToUse.logicalMinHeight(), intrinsicContentHeight))
return std::max(logicalHeight, computedContentLogicalHeight.value());
return logicalHeight;
}
RoundedRect::Radii RenderBox::borderRadii() const
{
auto& style = this->style();
LayoutRect bounds = frameRect();
unsigned borderLeft = style.borderLeftWidth();
unsigned borderTop = style.borderTopWidth();
bounds.moveBy(LayoutPoint(borderLeft, borderTop));
bounds.contract(borderLeft + style.borderRightWidth(), borderTop + style.borderBottomWidth());
return style.getRoundedBorderFor(bounds).radii();
}
RoundedRect RenderBox::roundedBorderBoxRect() const
{
return style().getRoundedInnerBorderFor(borderBoxRect());
}
LayoutRect RenderBox::paddingBoxRect() const
{
auto verticalScrollbarWidth = this->verticalScrollbarWidth();
LayoutUnit offsetForScrollbar = shouldPlaceVerticalScrollbarOnLeft() ? verticalScrollbarWidth : 0;
return LayoutRect(borderLeft() + offsetForScrollbar, borderTop(),
width() - borderLeft() - borderRight() - verticalScrollbarWidth,
height() - borderTop() - borderBottom() - horizontalScrollbarHeight());
}
LayoutPoint RenderBox::contentBoxLocation() const
{
LayoutUnit scrollbarSpace = shouldPlaceVerticalScrollbarOnLeft() ? verticalScrollbarWidth() : 0;
return { borderLeft() + paddingLeft() + scrollbarSpace, borderTop() + paddingTop() };
}
FloatRect RenderBox::referenceBoxRect(CSSBoxType boxType) const
{
switch (boxType) {
case CSSBoxType::ContentBox:
case CSSBoxType::FillBox:
return contentBoxRect();
case CSSBoxType::PaddingBox:
return paddingBoxRect();
case CSSBoxType::MarginBox:
return marginBoxRect();
// stroke-box, view-box compute to border-box for HTML elements.
case CSSBoxType::StrokeBox:
case CSSBoxType::ViewBox:
case CSSBoxType::BorderBox:
case CSSBoxType::BoxMissing:
return borderBoxRect();
}
ASSERT_NOT_REACHED();
return { };
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = snappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
{
LayoutRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
if (repaintContainer != this) {
FloatQuad containerRelativeQuad;
if (geometryMap)
containerRelativeQuad = geometryMap->mapToContainer(box, repaintContainer);
else
containerRelativeQuad = localToContainerQuad(FloatRect(box), repaintContainer);
box = LayoutRect(containerRelativeQuad.boundingBox());
}
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view().frameView().layoutContext().layoutDelta());
return LayoutRect(snapRectToDevicePixels(box, document().deviceScaleFactor()));
}
void RenderBox::addFocusRingRects(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*) const
{
if (!size().isEmpty())
rects.append(LayoutRect(additionalOffset, size()));
}
int RenderBox::reflectionOffset() const
{
if (!style().boxReflect())
return 0;
if (style().boxReflect()->direction() == ReflectionDirection::Left || style().boxReflect()->direction() == ReflectionDirection::Right)
return valueForLength(style().boxReflect()->offset(), borderBoxRect().width());
return valueForLength(style().boxReflect()->offset(), borderBoxRect().height());
}
LayoutRect RenderBox::reflectedRect(const LayoutRect& r) const
{
if (!style().boxReflect())
return LayoutRect();
LayoutRect box = borderBoxRect();
LayoutRect result = r;
switch (style().boxReflect()->direction()) {
case ReflectionDirection::Below:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionDirection::Above:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionDirection::Left:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionDirection::Right:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
bool RenderBox::fixedElementLaysOutRelativeToFrame(const LocalFrameView& frameView) const
{
return isFixedPositioned() && container()->isRenderView() && frameView.fixedElementsLayoutRelativeToFrame();
}
bool RenderBox::includeVerticalScrollbarSize() const
{
return hasNonVisibleOverflow() && layer() && !layer()->hasOverlayScrollbars()
&& (style().overflowY() == Overflow::Scroll || style().overflowY() == Overflow::Auto);
}
bool RenderBox::includeHorizontalScrollbarSize() const
{
return hasNonVisibleOverflow() && layer() && !layer()->hasOverlayScrollbars()
&& (style().overflowX() == Overflow::Scroll || style().overflowX() == Overflow::Auto);
}
int RenderBox::verticalScrollbarWidth() const
{
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
if (!scrollableArea)
return 0;
return includeVerticalScrollbarSize() ? scrollableArea->verticalScrollbarWidth() : 0;
}
int RenderBox::horizontalScrollbarHeight() const
{
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
if (!scrollableArea)
return 0;
return includeHorizontalScrollbarSize() ? scrollableArea->horizontalScrollbarHeight() : 0;
}
int RenderBox::intrinsicScrollbarLogicalWidth() const
{
if (!hasNonVisibleOverflow())
return 0;
if (isHorizontalWritingMode() && (style().overflowY() == Overflow::Scroll && !canUseOverlayScrollbars())) {
ASSERT(layer() && layer()->scrollableArea() && layer()->scrollableArea()->hasVerticalScrollbar());
return verticalScrollbarWidth();
}
if (!isHorizontalWritingMode() && (style().overflowX() == Overflow::Scroll && !canUseOverlayScrollbars())) {
ASSERT(layer() && layer()->scrollableArea() && layer()->scrollableArea()->hasHorizontalScrollbar());
return horizontalScrollbarHeight();
}
return 0;
}
bool RenderBox::scrollLayer(ScrollDirection direction, ScrollGranularity granularity, unsigned stepCount, Element** stopElement)
{
auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr;
if (scrollableArea && scrollableArea->scroll(direction, granularity, stepCount)) {
if (stopElement)
*stopElement = element();
return true;
}
return false;
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, unsigned stepCount, Element** stopElement, RenderBox* startBox, const IntPoint& wheelEventAbsolutePoint)
{
if (scrollLayer(direction, granularity, stepCount, stopElement))
return true;
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* nextScrollBlock = containingBlock();
if (nextScrollBlock && !nextScrollBlock->isRenderView())
return nextScrollBlock->scroll(direction, granularity, stepCount, stopElement, startBox, wheelEventAbsolutePoint);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, unsigned stepCount, Element** stopElement)
{
bool scrolled = false;
if (auto* scrollableArea = layer() ? layer()->scrollableArea() : nullptr) {
#if PLATFORM(COCOA)
// On Mac only we reset the inline direction position when doing a document scroll (e.g., hitting Home/End).
if (granularity == ScrollGranularity::Document)
scrolled = scrollableArea->scroll(logicalToPhysical(ScrollInlineDirectionBackward, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), ScrollGranularity::Document, stepCount);
#endif
if (scrollableArea->scroll(logicalToPhysical(direction, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), granularity, stepCount))
scrolled = true;
if (scrolled) {
if (stopElement)
*stopElement = element();
return true;
}
}
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, stepCount, stopElement);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (hasHorizontalOverflow() || hasVerticalOverflow());
}
bool RenderBox::isScrollableOrRubberbandableBox() const
{
return canBeScrolledAndHasScrollableArea();
}
bool RenderBox::requiresLayerWithScrollableArea() const
{
// FIXME: This is wrong; these boxes' layers should not need ScrollableAreas via RenderLayer.
if (isRenderView() || isDocumentElementRenderer())
return true;
if (hasPotentiallyScrollableOverflow())
return true;
if (style().resize() != Resize::None)
return true;
if (isHTMLMarquee() && style().marqueeBehavior() != MarqueeBehavior::None)
return true;
return false;
}
// FIXME: This is badly named. overflow:hidden can be programmatically scrolled, yet this returns false in that case.