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webkit / WebKit / c1d908c6d09e57f5313762b1b02c5605b1594985 / . / Source / WebCore / rendering / RenderBoxModelObject.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, 2006, 2007, 2008, 2009, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2010 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 "RenderBoxModelObject.h"
#include "BorderEdge.h"
#include "FloatRoundedRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "GeometryUtilities.h"
#include "GraphicsContext.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLNames.h"
#include "ImageBuffer.h"
#include "ImageQualityController.h"
#include "Page.h"
#include "Path.h"
#include "RenderBlock.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderLayerBacking.h"
#include "RenderLayerCompositor.h"
#include "RenderMultiColumnFlowThread.h"
#include "RenderNamedFlowFragment.h"
#include "RenderNamedFlowThread.h"
#include "RenderRegion.h"
#include "RenderTable.h"
#include "RenderTableRow.h"
#include "RenderText.h"
#include "RenderTextFragment.h"
#include "RenderView.h"
#include "ScrollingConstraints.h"
#include "Settings.h"
#include "TransformState.h"
#include <wtf/NeverDestroyed.h>
namespace WebCore {
using namespace HTMLNames;
// The HashMap for storing continuation pointers.
// An inline can be split with blocks occuring in between the inline content.
// When this occurs we need a pointer to the next object. We can basically be
// split into a sequence of inlines and blocks. The continuation will either be
// an anonymous block (that houses other blocks) or it will be an inline flow.
// <b><i><p>Hello</p></i></b>. In this example the <i> will have a block as
// its continuation but the <b> will just have an inline as its continuation.
typedef HashMap<const RenderBoxModelObject*, RenderBoxModelObject*> ContinuationMap;
static ContinuationMap& continuationMap()
{
static NeverDestroyed<ContinuationMap> map;
return map;
}
// This HashMap is similar to the continuation map, but connects first-letter
// renderers to their remaining text fragments.
typedef HashMap<const RenderBoxModelObject*, RenderTextFragment*> FirstLetterRemainingTextMap;
static FirstLetterRemainingTextMap* firstLetterRemainingTextMap = 0;
void RenderBoxModelObject::setSelectionState(SelectionState state)
{
if (state == SelectionInside && selectionState() != SelectionNone)
return;
if ((state == SelectionStart && selectionState() == SelectionEnd)
|| (state == SelectionEnd && selectionState() == SelectionStart))
RenderLayerModelObject::setSelectionState(SelectionBoth);
else
RenderLayerModelObject::setSelectionState(state);
// FIXME: We should consider whether it is OK propagating to ancestor RenderInlines.
// This is a workaround for http://webkit.org/b/32123
// The containing block can be null in case of an orphaned tree.
RenderBlock* containingBlock = this->containingBlock();
if (containingBlock && !containingBlock->isRenderView())
containingBlock->setSelectionState(state);
}
void RenderBoxModelObject::contentChanged(ContentChangeType changeType)
{
if (!hasLayer())
return;
layer()->contentChanged(changeType);
}
bool RenderBoxModelObject::hasAcceleratedCompositing() const
{
return view().compositor().hasAcceleratedCompositing();
}
bool RenderBoxModelObject::startTransition(double timeOffset, CSSPropertyID propertyId, const RenderStyle* fromStyle, const RenderStyle* toStyle)
{
ASSERT(hasLayer());
ASSERT(isComposited());
return layer()->backing()->startTransition(timeOffset, propertyId, fromStyle, toStyle);
}
void RenderBoxModelObject::transitionPaused(double timeOffset, CSSPropertyID propertyId)
{
ASSERT(hasLayer());
ASSERT(isComposited());
layer()->backing()->transitionPaused(timeOffset, propertyId);
}
void RenderBoxModelObject::transitionFinished(CSSPropertyID propertyId)
{
ASSERT(hasLayer());
ASSERT(isComposited());
layer()->backing()->transitionFinished(propertyId);
}
bool RenderBoxModelObject::startAnimation(double timeOffset, const Animation* animation, const KeyframeList& keyframes)
{
ASSERT(hasLayer());
ASSERT(isComposited());
return layer()->backing()->startAnimation(timeOffset, animation, keyframes);
}
void RenderBoxModelObject::animationPaused(double timeOffset, const String& name)
{
ASSERT(hasLayer());
ASSERT(isComposited());
layer()->backing()->animationPaused(timeOffset, name);
}
void RenderBoxModelObject::animationFinished(const String& name)
{
ASSERT(hasLayer());
ASSERT(isComposited());
layer()->backing()->animationFinished(name);
}
void RenderBoxModelObject::suspendAnimations(double time)
{
ASSERT(hasLayer());
ASSERT(isComposited());
layer()->backing()->suspendAnimations(time);
}
bool RenderBoxModelObject::shouldPaintAtLowQuality(GraphicsContext* context, Image* image, const void* layer, const LayoutSize& size)
{
return view().imageQualityController().shouldPaintAtLowQuality(context, this, image, layer, size);
}
RenderBoxModelObject::RenderBoxModelObject(Element& element, Ref<RenderStyle>&& style, unsigned baseTypeFlags)
: RenderLayerModelObject(element, WTF::move(style), baseTypeFlags | RenderBoxModelObjectFlag)
{
}
RenderBoxModelObject::RenderBoxModelObject(Document& document, Ref<RenderStyle>&& style, unsigned baseTypeFlags)
: RenderLayerModelObject(document, WTF::move(style), baseTypeFlags | RenderBoxModelObjectFlag)
{
}
RenderBoxModelObject::~RenderBoxModelObject()
{
}
void RenderBoxModelObject::willBeDestroyed()
{
if (hasContinuation()) {
continuation()->destroy();
setContinuation(nullptr);
}
// If this is a first-letter object with a remaining text fragment then the
// entry needs to be cleared from the map.
if (firstLetterRemainingText())
setFirstLetterRemainingText(0);
if (!documentBeingDestroyed())
view().imageQualityController().rendererWillBeDestroyed(*this);
RenderLayerModelObject::willBeDestroyed();
}
bool RenderBoxModelObject::hasBoxDecorationStyle() const
{
return hasBackground() || style().hasBorder() || style().hasAppearance() || style().boxShadow();
}
void RenderBoxModelObject::updateFromStyle()
{
RenderLayerModelObject::updateFromStyle();
// Set the appropriate bits for a box model object. Since all bits are cleared in styleWillChange,
// we only check for bits that could possibly be set to true.
const RenderStyle& styleToUse = style();
setHasBoxDecorations(hasBoxDecorationStyle());
setInline(styleToUse.isDisplayInlineType());
setPositionState(styleToUse.position());
setHorizontalWritingMode(styleToUse.isHorizontalWritingMode());
}
static LayoutSize accumulateInFlowPositionOffsets(const RenderObject* child)
{
if (!child->isAnonymousBlock() || !child->isInFlowPositioned())
return LayoutSize();
LayoutSize offset;
for (RenderElement* parent = downcast<RenderBlock>(*child).inlineElementContinuation(); is<RenderInline>(parent); parent = parent->parent()) {
if (parent->isInFlowPositioned())
offset += downcast<RenderInline>(*parent).offsetForInFlowPosition();
}
return offset;
}
bool RenderBoxModelObject::hasAutoHeightOrContainingBlockWithAutoHeight() const
{
Length logicalHeightLength = style().logicalHeight();
if (logicalHeightLength.isAuto())
return true;
// For percentage heights: The percentage is calculated with respect to the height of the generated box's
// containing block. If the height of the containing block is not specified explicitly (i.e., it depends
// on content height), and this element is not absolutely positioned, the value computes to 'auto'.
if (!logicalHeightLength.isPercent() || isOutOfFlowPositioned() || document().inQuirksMode())
return false;
// Anonymous block boxes are ignored when resolving percentage values that would refer to it:
// the closest non-anonymous ancestor box is used instead.
RenderBlock* cb = containingBlock();
while (cb->isAnonymous() && !cb->isRenderView())
cb = cb->containingBlock();
// Matching RenderBox::percentageLogicalHeightIsResolvableFromBlock() by
// ignoring table cell's attribute value, where it says that table cells violate
// what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not.
if (cb->isTableCell())
return false;
// Match RenderBox::availableLogicalHeightUsing by special casing
// the render view. The available height is taken from the frame.
if (cb->isRenderView())
return false;
if (cb->isOutOfFlowPositioned() && !cb->style().logicalTop().isAuto() && !cb->style().logicalBottom().isAuto())
return false;
// If the height of the containing block computes to 'auto', then it hasn't been 'specified explictly'.
return cb->hasAutoHeightOrContainingBlockWithAutoHeight();
}
LayoutSize RenderBoxModelObject::relativePositionOffset() const
{
LayoutSize offset = accumulateInFlowPositionOffsets(this);
RenderBlock* containingBlock = this->containingBlock();
// Objects that shrink to avoid floats normally use available line width when computing containing block width. However
// in the case of relative positioning using percentages, we can't do this. The offset should always be resolved using the
// available width of the containing block. Therefore we don't use containingBlockLogicalWidthForContent() here, but instead explicitly
// call availableWidth on our containing block.
if (!style().left().isAuto()) {
if (!style().right().isAuto() && !containingBlock->style().isLeftToRightDirection())
offset.setWidth(-valueForLength(style().right(), containingBlock->availableWidth()));
else
offset.expand(valueForLength(style().left(), containingBlock->availableWidth()), 0);
} else if (!style().right().isAuto()) {
offset.expand(-valueForLength(style().right(), containingBlock->availableWidth()), 0);
}
// If the containing block of a relatively positioned element does not
// specify a height, a percentage top or bottom offset should be resolved as
// auto. An exception to this is if the containing block has the WinIE quirk
// where <html> and <body> assume the size of the viewport. In this case,
// calculate the percent offset based on this height.
// See <https://bugs.webkit.org/show_bug.cgi?id=26396>.
if (!style().top().isAuto()
&& (!containingBlock->hasAutoHeightOrContainingBlockWithAutoHeight()
|| !style().top().isPercent()
|| containingBlock->stretchesToViewport()))
offset.expand(0, valueForLength(style().top(), containingBlock->availableHeight()));
else if (!style().bottom().isAuto()
&& (!containingBlock->hasAutoHeightOrContainingBlockWithAutoHeight()
|| !style().bottom().isPercent()
|| containingBlock->stretchesToViewport()))
offset.expand(0, -valueForLength(style().bottom(), containingBlock->availableHeight()));
return offset;
}
LayoutPoint RenderBoxModelObject::adjustedPositionRelativeToOffsetParent(const LayoutPoint& startPoint) const
{
// If the element is the HTML body element or doesn't have a parent
// return 0 and stop this algorithm.
if (isBody() || !parent())
return LayoutPoint();
LayoutPoint referencePoint = startPoint;
// If the offsetParent of the element is null, or is the HTML body element,
// return the distance between the canvas origin and the left border edge
// of the element and stop this algorithm.
if (const RenderBoxModelObject* offsetParent = this->offsetParent()) {
if (is<RenderBox>(*offsetParent) && !offsetParent->isBody() && !is<RenderTable>(*offsetParent))
referencePoint.move(-downcast<RenderBox>(*offsetParent).borderLeft(), -downcast<RenderBox>(*offsetParent).borderTop());
if (!isOutOfFlowPositioned() || flowThreadContainingBlock()) {
if (isRelPositioned())
referencePoint.move(relativePositionOffset());
else if (isStickyPositioned())
referencePoint.move(stickyPositionOffset());
// CSS regions specification says that region flows should return the body element as their offsetParent.
// Since we will bypass the body’s renderer anyway, just end the loop if we encounter a region flow (named flow thread).
// See http://dev.w3.org/csswg/css-regions/#cssomview-offset-attributes
auto* ancestor = parent();
while (ancestor != offsetParent && !is<RenderNamedFlowThread>(*ancestor)) {
// FIXME: What are we supposed to do inside SVG content?
if (is<RenderMultiColumnFlowThread>(*ancestor)) {
// We need to apply a translation based off what region we are inside.
RenderRegion* region = downcast<RenderMultiColumnFlowThread>(*ancestor).physicalTranslationFromFlowToRegion(referencePoint);
if (region)
referencePoint.moveBy(region->topLeftLocation());
} else if (!isOutOfFlowPositioned()) {
if (is<RenderBox>(*ancestor) && !is<RenderTableRow>(*ancestor))
referencePoint.moveBy(downcast<RenderBox>(*ancestor).topLeftLocation());
}
ancestor = ancestor->parent();
}
// Compute the offset position for elements inside named flow threads for which the offsetParent was the body.
// See https://bugs.webkit.org/show_bug.cgi?id=115899
if (is<RenderNamedFlowThread>(*ancestor))
referencePoint = downcast<RenderNamedFlowThread>(*ancestor).adjustedPositionRelativeToOffsetParent(*this, referencePoint);
else if (is<RenderBox>(*offsetParent) && offsetParent->isBody() && !offsetParent->isPositioned())
referencePoint.moveBy(downcast<RenderBox>(*offsetParent).topLeftLocation());
}
}
return referencePoint;
}
void RenderBoxModelObject::computeStickyPositionConstraints(StickyPositionViewportConstraints& constraints, const FloatRect& constrainingRect) const
{
constraints.setConstrainingRectAtLastLayout(constrainingRect);
RenderBlock* containingBlock = this->containingBlock();
RenderLayer* enclosingClippingLayer = layer()->enclosingOverflowClipLayer(ExcludeSelf);
RenderBox& enclosingClippingBox = enclosingClippingLayer ? downcast<RenderBox>(enclosingClippingLayer->renderer()) : view();
LayoutRect containerContentRect;
if (!enclosingClippingLayer || (containingBlock != &enclosingClippingBox))
containerContentRect = containingBlock->contentBoxRect();
else {
containerContentRect = containingBlock->layoutOverflowRect();
LayoutPoint containerLocation = containerContentRect.location() + LayoutPoint(containingBlock->borderLeft() + containingBlock->paddingLeft(),
containingBlock->borderTop() + containingBlock->paddingTop());
containerContentRect.setLocation(containerLocation);
}
LayoutUnit maxWidth = containingBlock->availableLogicalWidth();
// Sticky positioned element ignore any override logical width on the containing block (as they don't call
// containingBlockLogicalWidthForContent). It's unclear whether this is totally fine.
LayoutBoxExtent minMargin(minimumValueForLength(style().marginTop(), maxWidth),
minimumValueForLength(style().marginRight(), maxWidth),
minimumValueForLength(style().marginBottom(), maxWidth),
minimumValueForLength(style().marginLeft(), maxWidth));
// Compute the container-relative area within which the sticky element is allowed to move.
containerContentRect.contract(minMargin);
// Finally compute container rect relative to the scrolling ancestor.
FloatRect containerRectRelativeToScrollingAncestor = containingBlock->localToContainerQuad(FloatRect(containerContentRect), &enclosingClippingBox).boundingBox();
if (enclosingClippingLayer) {
FloatPoint containerLocationRelativeToScrollingAncestor = containerRectRelativeToScrollingAncestor.location() -
FloatSize(enclosingClippingBox.borderLeft() + enclosingClippingBox.paddingLeft(),
enclosingClippingBox.borderTop() + enclosingClippingBox.paddingTop());
if (&enclosingClippingBox != containingBlock)
containerLocationRelativeToScrollingAncestor += enclosingClippingLayer->scrollOffset();
containerRectRelativeToScrollingAncestor.setLocation(containerLocationRelativeToScrollingAncestor);
}
constraints.setContainingBlockRect(containerRectRelativeToScrollingAncestor);
// Now compute the sticky box rect, also relative to the scrolling ancestor.
LayoutRect stickyBoxRect = frameRectForStickyPositioning();
LayoutRect flippedStickyBoxRect = stickyBoxRect;
containingBlock->flipForWritingMode(flippedStickyBoxRect);
FloatRect stickyBoxRelativeToScrollingAnecstor = flippedStickyBoxRect;
// FIXME: sucks to call localToContainerQuad again, but we can't just offset from the previously computed rect if there are transforms.
// Map to the view to avoid including page scale factor.
FloatPoint stickyLocationRelativeToScrollingAncestor = flippedStickyBoxRect.location() + containingBlock->localToContainerQuad(FloatRect(FloatPoint(), containingBlock->size()), &enclosingClippingBox).boundingBox().location();
if (enclosingClippingLayer) {
stickyLocationRelativeToScrollingAncestor -= FloatSize(enclosingClippingBox.borderLeft() + enclosingClippingBox.paddingLeft(),
enclosingClippingBox.borderTop() + enclosingClippingBox.paddingTop());
if (&enclosingClippingBox != containingBlock)
stickyLocationRelativeToScrollingAncestor += enclosingClippingLayer->scrollOffset();
}
// FIXME: For now, assume that |this| is not transformed.
stickyBoxRelativeToScrollingAnecstor.setLocation(stickyLocationRelativeToScrollingAncestor);
constraints.setStickyBoxRect(stickyBoxRelativeToScrollingAnecstor);
if (!style().left().isAuto()) {
constraints.setLeftOffset(valueForLength(style().left(), constrainingRect.width()));
constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeLeft);
}
if (!style().right().isAuto()) {
constraints.setRightOffset(valueForLength(style().right(), constrainingRect.width()));
constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeRight);
}
if (!style().top().isAuto()) {
constraints.setTopOffset(valueForLength(style().top(), constrainingRect.height()));
constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeTop);
}
if (!style().bottom().isAuto()) {
constraints.setBottomOffset(valueForLength(style().bottom(), constrainingRect.height()));
constraints.addAnchorEdge(ViewportConstraints::AnchorEdgeBottom);
}
}
FloatRect RenderBoxModelObject::constrainingRectForStickyPosition() const
{
RenderLayer* enclosingClippingLayer = layer()->enclosingOverflowClipLayer(ExcludeSelf);
if (enclosingClippingLayer) {
RenderBox& enclosingClippingBox = downcast<RenderBox>(enclosingClippingLayer->renderer());
LayoutRect clipRect = enclosingClippingBox.overflowClipRect(LayoutPoint(), 0); // FIXME: make this work in regions.
clipRect.contract(LayoutSize(enclosingClippingBox.paddingLeft() + enclosingClippingBox.paddingRight(),
enclosingClippingBox.paddingTop() + enclosingClippingBox.paddingBottom()));
FloatRect constrainingRect = enclosingClippingBox.localToContainerQuad(FloatRect(clipRect), &view()).boundingBox();
FloatPoint scrollOffset = FloatPoint() + enclosingClippingLayer->scrollOffset();
constrainingRect.setLocation(scrollOffset);
return constrainingRect;
}
return view().frameView().viewportConstrainedVisibleContentRect();
}
LayoutSize RenderBoxModelObject::stickyPositionOffset() const
{
ASSERT(hasLayer());
FloatRect constrainingRect = constrainingRectForStickyPosition();
StickyPositionViewportConstraints constraints;
computeStickyPositionConstraints(constraints, constrainingRect);
// The sticky offset is physical, so we can just return the delta computed in absolute coords (though it may be wrong with transforms).
return LayoutSize(constraints.computeStickyOffset(constrainingRect));
}
LayoutSize RenderBoxModelObject::offsetForInFlowPosition() const
{
if (isRelPositioned())
return relativePositionOffset();
if (isStickyPositioned())
return stickyPositionOffset();
return LayoutSize();
}
LayoutUnit RenderBoxModelObject::offsetLeft() const
{
// Note that RenderInline and RenderBox override this to pass a different
// startPoint to adjustedPositionRelativeToOffsetParent.
return adjustedPositionRelativeToOffsetParent(LayoutPoint()).x();
}
LayoutUnit RenderBoxModelObject::offsetTop() const
{
// Note that RenderInline and RenderBox override this to pass a different
// startPoint to adjustedPositionRelativeToOffsetParent.
return adjustedPositionRelativeToOffsetParent(LayoutPoint()).y();
}
int RenderBoxModelObject::pixelSnappedOffsetWidth() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(offsetWidth());
}
int RenderBoxModelObject::pixelSnappedOffsetHeight() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(offsetHeight());
}
LayoutUnit RenderBoxModelObject::computedCSSPadding(const Length& padding) const
{
LayoutUnit w = 0;
if (padding.isPercent())
w = containingBlockLogicalWidthForContent();
return minimumValueForLength(padding, w);
}
RoundedRect RenderBoxModelObject::getBackgroundRoundedRect(const LayoutRect& borderRect, InlineFlowBox* box, LayoutUnit inlineBoxWidth, LayoutUnit inlineBoxHeight,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
{
RoundedRect border = style().getRoundedBorderFor(borderRect, includeLogicalLeftEdge, includeLogicalRightEdge);
if (box && (box->nextLineBox() || box->prevLineBox())) {
RoundedRect segmentBorder = style().getRoundedBorderFor(LayoutRect(0, 0, inlineBoxWidth, inlineBoxHeight), includeLogicalLeftEdge, includeLogicalRightEdge);
border.setRadii(segmentBorder.radii());
}
return border;
}
void RenderBoxModelObject::clipRoundedInnerRect(GraphicsContext * context, const FloatRect& rect, const FloatRoundedRect& clipRect)
{
if (clipRect.isRenderable())
context->clipRoundedRect(clipRect);
else {
// We create a rounded rect for each of the corners and clip it, while making sure we clip opposing corners together.
if (!clipRect.radii().topLeft().isEmpty() || !clipRect.radii().bottomRight().isEmpty()) {
FloatRect topCorner(clipRect.rect().x(), clipRect.rect().y(), rect.maxX() - clipRect.rect().x(), rect.maxY() - clipRect.rect().y());
FloatRoundedRect::Radii topCornerRadii;
topCornerRadii.setTopLeft(clipRect.radii().topLeft());
context->clipRoundedRect(FloatRoundedRect(topCorner, topCornerRadii));
FloatRect bottomCorner(rect.x(), rect.y(), clipRect.rect().maxX() - rect.x(), clipRect.rect().maxY() - rect.y());
FloatRoundedRect::Radii bottomCornerRadii;
bottomCornerRadii.setBottomRight(clipRect.radii().bottomRight());
context->clipRoundedRect(FloatRoundedRect(bottomCorner, bottomCornerRadii));
}
if (!clipRect.radii().topRight().isEmpty() || !clipRect.radii().bottomLeft().isEmpty()) {
FloatRect topCorner(rect.x(), clipRect.rect().y(), clipRect.rect().maxX() - rect.x(), rect.maxY() - clipRect.rect().y());
FloatRoundedRect::Radii topCornerRadii;
topCornerRadii.setTopRight(clipRect.radii().topRight());
context->clipRoundedRect(FloatRoundedRect(topCorner, topCornerRadii));
FloatRect bottomCorner(clipRect.rect().x(), rect.y(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y());
FloatRoundedRect::Radii bottomCornerRadii;
bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
context->clipRoundedRect(FloatRoundedRect(bottomCorner, bottomCornerRadii));
}
}
}
static LayoutRect shrinkRectByOneDevicePixel(const GraphicsContext& context, const LayoutRect& rect, float devicePixelRatio)
{
LayoutRect shrunkRect = rect;
AffineTransform transform = context.getCTM();
shrunkRect.inflateX(-ceilToDevicePixel(LayoutUnit::fromPixel(1) / transform.xScale(), devicePixelRatio));
shrunkRect.inflateY(-ceilToDevicePixel(LayoutUnit::fromPixel(1) / transform.yScale(), devicePixelRatio));
return shrunkRect;
}
LayoutRect RenderBoxModelObject::borderInnerRectAdjustedForBleedAvoidance(const GraphicsContext& context, const LayoutRect& rect, BackgroundBleedAvoidance bleedAvoidance) const
{
if (bleedAvoidance != BackgroundBleedBackgroundOverBorder)
return rect;
// We shrink the rectangle by one device pixel on each side to make it fully overlap the anti-aliased background border
return shrinkRectByOneDevicePixel(context, rect, document().deviceScaleFactor());
}
RoundedRect RenderBoxModelObject::backgroundRoundedRectAdjustedForBleedAvoidance(const GraphicsContext& context, const LayoutRect& borderRect, BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox* box, const LayoutSize& boxSize, bool includeLogicalLeftEdge, bool includeLogicalRightEdge) const
{
if (bleedAvoidance == BackgroundBleedShrinkBackground) {
// We shrink the rectangle by one device pixel on each side because the bleed is one pixel maximum.
return getBackgroundRoundedRect(shrinkRectByOneDevicePixel(context, borderRect, document().deviceScaleFactor()), box, boxSize.width(), boxSize.height(),
includeLogicalLeftEdge, includeLogicalRightEdge);
}
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
return style().getRoundedInnerBorderFor(borderRect, includeLogicalLeftEdge, includeLogicalRightEdge);
return getBackgroundRoundedRect(borderRect, box, boxSize.width(), boxSize.height(), includeLogicalLeftEdge, includeLogicalRightEdge);
}
static void applyBoxShadowForBackground(GraphicsContext* context, RenderStyle* style)
{
const ShadowData* boxShadow = style->boxShadow();
while (boxShadow->style() != Normal)
boxShadow = boxShadow->next();
FloatSize shadowOffset(boxShadow->x(), boxShadow->y());
if (!boxShadow->isWebkitBoxShadow())
context->setShadow(shadowOffset, boxShadow->radius(), boxShadow->color(), style->colorSpace());
else
context->setLegacyShadow(shadowOffset, boxShadow->radius(), boxShadow->color(), style->colorSpace());
}
void RenderBoxModelObject::paintMaskForTextFillBox(ImageBuffer* maskImage, const IntRect& maskRect, InlineFlowBox* box, const LayoutRect& scrolledPaintRect)
{
GraphicsContext* maskImageContext = maskImage->context();
maskImageContext->translate(-maskRect.x(), -maskRect.y());
// Now add the text to the clip. We do this by painting using a special paint phase that signals to
// InlineTextBoxes that they should just add their contents to the clip.
PaintInfo info(maskImageContext, maskRect, PaintPhaseTextClip, PaintBehaviorForceBlackText, 0);
if (box) {
const RootInlineBox& rootBox = box->root();
box->paint(info, LayoutPoint(scrolledPaintRect.x() - box->x(), scrolledPaintRect.y() - box->y()), rootBox.lineTop(), rootBox.lineBottom());
} else if (isRenderNamedFlowFragmentContainer()) {
RenderNamedFlowFragment& region = *downcast<RenderBlockFlow>(*this).renderNamedFlowFragment();
if (region.isValid())
region.flowThread()->layer()->paintNamedFlowThreadInsideRegion(maskImageContext, &region, maskRect, maskRect.location(), PaintBehaviorForceBlackText, RenderLayer::PaintLayerTemporaryClipRects);
} else {
LayoutSize localOffset = is<RenderBox>(*this) ? downcast<RenderBox>(*this).locationOffset() : LayoutSize();
paint(info, scrolledPaintRect.location() - localOffset);
}
}
void RenderBoxModelObject::paintFillLayerExtended(const PaintInfo& paintInfo, const Color& color, const FillLayer* bgLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox* box, const LayoutSize& boxSize, CompositeOperator op, RenderElement* backgroundObject, BaseBackgroundColorUsage baseBgColorUsage)
{
GraphicsContext* context = paintInfo.context;
if (context->paintingDisabled() || rect.isEmpty())
return;
bool includeLeftEdge = box ? box->includeLogicalLeftEdge() : true;
bool includeRightEdge = box ? box->includeLogicalRightEdge() : true;
bool hasRoundedBorder = style().hasBorderRadius() && (includeLeftEdge || includeRightEdge);
bool clippedWithLocalScrolling = hasOverflowClip() && bgLayer->attachment() == LocalBackgroundAttachment;
bool isBorderFill = bgLayer->clip() == BorderFillBox;
bool isRoot = this->isRoot();
Color bgColor = color;
StyleImage* bgImage = bgLayer->image();
bool shouldPaintBackgroundImage = bgImage && bgImage->canRender(this, style().effectiveZoom());
bool forceBackgroundToWhite = false;
if (document().printing()) {
if (style().printColorAdjust() == PrintColorAdjustEconomy)
forceBackgroundToWhite = true;
if (frame().settings().shouldPrintBackgrounds())
forceBackgroundToWhite = false;
}
// When printing backgrounds is disabled or using economy mode,
// change existing background colors and images to a solid white background.
// If there's no bg color or image, leave it untouched to avoid affecting transparency.
// We don't try to avoid loading the background images, because this style flag is only set
// when printing, and at that point we've already loaded the background images anyway. (To avoid
// loading the background images we'd have to do this check when applying styles rather than
// while rendering.)
if (forceBackgroundToWhite) {
// Note that we can't reuse this variable below because the bgColor might be changed
bool shouldPaintBackgroundColor = !bgLayer->next() && bgColor.isValid() && bgColor.alpha();
if (shouldPaintBackgroundImage || shouldPaintBackgroundColor) {
bgColor = Color::white;
shouldPaintBackgroundImage = false;
}
}
bool baseBgColorOnly = (baseBgColorUsage == BaseBackgroundColorOnly);
if (baseBgColorOnly && (!isRoot || bgLayer->next() || (bgColor.isValid() && !bgColor.hasAlpha())))
return;
bool colorVisible = bgColor.isValid() && bgColor.alpha();
float deviceScaleFactor = document().deviceScaleFactor();
FloatRect pixelSnappedRect = snapRectToDevicePixels(rect, deviceScaleFactor);
// Fast path for drawing simple color backgrounds.
if (!isRoot && !clippedWithLocalScrolling && !shouldPaintBackgroundImage && isBorderFill && !bgLayer->next()) {
if (!colorVisible)
return;
bool boxShadowShouldBeAppliedToBackground = this->boxShadowShouldBeAppliedToBackground(bleedAvoidance, box);
GraphicsContextStateSaver shadowStateSaver(*context, boxShadowShouldBeAppliedToBackground);
if (boxShadowShouldBeAppliedToBackground)
applyBoxShadowForBackground(context, &style());
if (hasRoundedBorder && bleedAvoidance != BackgroundBleedUseTransparencyLayer) {
FloatRoundedRect pixelSnappedBorder = backgroundRoundedRectAdjustedForBleedAvoidance(*context, rect, bleedAvoidance, box, boxSize,
includeLeftEdge, includeRightEdge).pixelSnappedRoundedRectForPainting(deviceScaleFactor);
if (pixelSnappedBorder.isRenderable())
context->fillRoundedRect(pixelSnappedBorder, bgColor, style().colorSpace());
else {
context->save();
clipRoundedInnerRect(context, pixelSnappedRect, pixelSnappedBorder);
context->fillRect(pixelSnappedBorder.rect(), bgColor, style().colorSpace());
context->restore();
}
} else
context->fillRect(pixelSnappedRect, bgColor, style().colorSpace());
return;
}
// BorderFillBox radius clipping is taken care of by BackgroundBleedUseTransparencyLayer
bool clipToBorderRadius = hasRoundedBorder && !(isBorderFill && bleedAvoidance == BackgroundBleedUseTransparencyLayer);
GraphicsContextStateSaver clipToBorderStateSaver(*context, clipToBorderRadius);
if (clipToBorderRadius) {
RoundedRect border = isBorderFill ? backgroundRoundedRectAdjustedForBleedAvoidance(*context, rect, bleedAvoidance, box, boxSize, includeLeftEdge, includeRightEdge) : getBackgroundRoundedRect(rect, box, boxSize.width(), boxSize.height(), includeLeftEdge, includeRightEdge);
// Clip to the padding or content boxes as necessary.
if (bgLayer->clip() == ContentFillBox) {
border = style().getRoundedInnerBorderFor(border.rect(),
paddingTop() + borderTop(), paddingBottom() + borderBottom(), paddingLeft() + borderLeft(), paddingRight() + borderRight(), includeLeftEdge, includeRightEdge);
} else if (bgLayer->clip() == PaddingFillBox)
border = style().getRoundedInnerBorderFor(border.rect(), includeLeftEdge, includeRightEdge);
clipRoundedInnerRect(context, pixelSnappedRect, border.pixelSnappedRoundedRectForPainting(deviceScaleFactor));
}
LayoutUnit bLeft = includeLeftEdge ? borderLeft() : LayoutUnit::fromPixel(0);
LayoutUnit bRight = includeRightEdge ? borderRight() : LayoutUnit::fromPixel(0);
LayoutUnit pLeft = includeLeftEdge ? paddingLeft() : LayoutUnit();
LayoutUnit pRight = includeRightEdge ? paddingRight() : LayoutUnit();
GraphicsContextStateSaver clipWithScrollingStateSaver(*context, clippedWithLocalScrolling);
LayoutRect scrolledPaintRect = rect;
if (clippedWithLocalScrolling) {
// Clip to the overflow area.
auto& thisBox = downcast<RenderBox>(*this);
context->clip(thisBox.overflowClipRect(rect.location(), currentRenderNamedFlowFragment()));
// Adjust the paint rect to reflect a scrolled content box with borders at the ends.
IntSize offset = thisBox.scrolledContentOffset();
scrolledPaintRect.move(-offset);
scrolledPaintRect.setWidth(bLeft + layer()->scrollWidth() + bRight);
scrolledPaintRect.setHeight(borderTop() + layer()->scrollHeight() + borderBottom());
}
GraphicsContextStateSaver backgroundClipStateSaver(*context, false);
std::unique_ptr<ImageBuffer> maskImage;
IntRect maskRect;
if (bgLayer->clip() == PaddingFillBox || bgLayer->clip() == ContentFillBox) {
// Clip to the padding or content boxes as necessary.
if (!clipToBorderRadius) {
bool includePadding = bgLayer->clip() == ContentFillBox;
LayoutRect clipRect = LayoutRect(scrolledPaintRect.x() + bLeft + (includePadding ? pLeft : LayoutUnit()),
scrolledPaintRect.y() + borderTop() + (includePadding ? paddingTop() : LayoutUnit()),
scrolledPaintRect.width() - bLeft - bRight - (includePadding ? pLeft + pRight : LayoutUnit()),
scrolledPaintRect.height() - borderTop() - borderBottom() - (includePadding ? paddingTop() + paddingBottom() : LayoutUnit()));
backgroundClipStateSaver.save();
context->clip(clipRect);
}
} else if (bgLayer->clip() == TextFillBox) {
// We have to draw our text into a mask that can then be used to clip background drawing.
// First figure out how big the mask has to be. It should be no bigger than what we need
// to actually render, so we should intersect the dirty rect with the border box of the background.
maskRect = snappedIntRect(rect);
maskRect.intersect(snappedIntRect(paintInfo.rect));
// Now create the mask.
maskImage = context->createCompatibleBuffer(maskRect.size());
if (!maskImage)
return;
paintMaskForTextFillBox(maskImage.get(), maskRect, box, scrolledPaintRect);
// The mask has been created. Now we just need to clip to it.
backgroundClipStateSaver.save();
context->clip(maskRect);
context->beginTransparencyLayer(1);
}
// Only fill with a base color (e.g., white) if we're the root document, since iframes/frames with
// no background in the child document should show the parent's background.
bool isOpaqueRoot = false;
if (isRoot) {
isOpaqueRoot = true;
if (!bgLayer->next() && !(bgColor.isValid() && bgColor.alpha() == 255)) {
HTMLFrameOwnerElement* ownerElement = document().ownerElement();
if (ownerElement) {
if (!ownerElement->hasTagName(frameTag)) {
// Locate the <body> element using the DOM. This is easier than trying
// to crawl around a render tree with potential :before/:after content and
// anonymous blocks created by inline <body> tags etc. We can locate the <body>
// render object very easily via the DOM.
HTMLElement* body = document().body();
if (body) {
// Can't scroll a frameset document anyway.
isOpaqueRoot = body->hasTagName(framesetTag);
} else {
// SVG documents and XML documents with SVG root nodes are transparent.
isOpaqueRoot = !document().hasSVGRootNode();
}
}
} else
isOpaqueRoot = !view().frameView().isTransparent();
}
view().frameView().setContentIsOpaque(isOpaqueRoot);
}
// Paint the color first underneath all images, culled if background image occludes it.
// FIXME: In the bgLayer->hasFiniteBounds() case, we could improve the culling test
// by verifying whether the background image covers the entire layout rect.
if (!bgLayer->next()) {
LayoutRect backgroundRect(scrolledPaintRect);
bool boxShadowShouldBeAppliedToBackground = this->boxShadowShouldBeAppliedToBackground(bleedAvoidance, box);
if (boxShadowShouldBeAppliedToBackground || !shouldPaintBackgroundImage || !bgLayer->hasOpaqueImage(*this) || !bgLayer->hasRepeatXY()) {
if (!boxShadowShouldBeAppliedToBackground)
backgroundRect.intersect(paintInfo.rect);
// If we have an alpha and we are painting the root element, go ahead and blend with the base background color.
Color baseColor;
bool shouldClearBackground = false;
if ((baseBgColorUsage != BaseBackgroundColorSkip) && isOpaqueRoot) {
baseColor = view().frameView().baseBackgroundColor();
if (!baseColor.alpha())
shouldClearBackground = true;
}
GraphicsContextStateSaver shadowStateSaver(*context, boxShadowShouldBeAppliedToBackground);
if (boxShadowShouldBeAppliedToBackground)
applyBoxShadowForBackground(context, &style());
FloatRect backgroundRectForPainting = snapRectToDevicePixels(backgroundRect, deviceScaleFactor);
if (baseColor.alpha()) {
if (!baseBgColorOnly && bgColor.alpha())
baseColor = baseColor.blend(bgColor);
context->fillRect(backgroundRectForPainting, baseColor, style().colorSpace(), CompositeCopy);
} else if (!baseBgColorOnly && bgColor.alpha()) {
CompositeOperator operation = shouldClearBackground ? CompositeCopy : context->compositeOperation();
context->fillRect(backgroundRectForPainting, bgColor, style().colorSpace(), operation);
} else if (shouldClearBackground)
context->clearRect(backgroundRectForPainting);
}
}
// no progressive loading of the background image
if (!baseBgColorOnly && shouldPaintBackgroundImage) {
BackgroundImageGeometry geometry;
calculateBackgroundImageGeometry(paintInfo.paintContainer, bgLayer, scrolledPaintRect, geometry, backgroundObject);
geometry.clip(LayoutRect(pixelSnappedRect));
if (!geometry.destRect().isEmpty()) {
CompositeOperator compositeOp = op == CompositeSourceOver ? bgLayer->composite() : op;
auto clientForBackgroundImage = backgroundObject ? backgroundObject : this;
RefPtr<Image> image = bgImage->image(clientForBackgroundImage, geometry.tileSize());
context->setDrawLuminanceMask(bgLayer->maskSourceType() == MaskLuminance);
bool useLowQualityScaling = shouldPaintAtLowQuality(context, image.get(), bgLayer, geometry.tileSize());
if (image.get())
image->setSpaceSize(geometry.spaceSize());
context->drawTiledImage(image.get(), style().colorSpace(), geometry.destRect(), geometry.relativePhase(), geometry.tileSize(), ImagePaintingOptions(compositeOp, bgLayer->blendMode(), ImageOrientationDescription(), useLowQualityScaling));
}
}
if (bgLayer->clip() == TextFillBox) {
context->drawImageBuffer(maskImage.get(), ColorSpaceDeviceRGB, maskRect, CompositeDestinationIn);
context->endTransparencyLayer();
}
}
static inline int resolveWidthForRatio(LayoutUnit height, const FloatSize& intrinsicRatio)
{
return height * intrinsicRatio.width() / intrinsicRatio.height();
}
static inline int resolveHeightForRatio(LayoutUnit width, const FloatSize& intrinsicRatio)
{
return width * intrinsicRatio.height() / intrinsicRatio.width();
}
static inline LayoutSize resolveAgainstIntrinsicWidthOrHeightAndRatio(const LayoutSize& size, const FloatSize& intrinsicRatio, LayoutUnit useWidth, LayoutUnit useHeight)
{
if (intrinsicRatio.isEmpty()) {
if (useWidth)
return LayoutSize(useWidth, size.height());
return LayoutSize(size.width(), useHeight);
}
if (useWidth)
return LayoutSize(useWidth, resolveHeightForRatio(useWidth, intrinsicRatio));
return LayoutSize(resolveWidthForRatio(useHeight, intrinsicRatio), useHeight);
}
static inline LayoutSize resolveAgainstIntrinsicRatio(const LayoutSize& size, const FloatSize& intrinsicRatio)
{
// Two possible solutions: (size.width(), solutionHeight) or (solutionWidth, size.height())
// "... must be assumed to be the largest dimensions..." = easiest answer: the rect with the largest surface area.
LayoutUnit solutionWidth = resolveWidthForRatio(size.height(), intrinsicRatio);
LayoutUnit solutionHeight = resolveHeightForRatio(size.width(), intrinsicRatio);
if (solutionWidth <= size.width()) {
if (solutionHeight <= size.height()) {
// If both solutions fit, choose the one covering the larger area.
LayoutUnit areaOne = solutionWidth * size.height();
LayoutUnit areaTwo = size.width() * solutionHeight;
if (areaOne < areaTwo)
return LayoutSize(size.width(), solutionHeight);
return LayoutSize(solutionWidth, size.height());
}
// Only the first solution fits.
return LayoutSize(solutionWidth, size.height());
}
// Only the second solution fits, assert that.
ASSERT(solutionHeight <= size.height());
return LayoutSize(size.width(), solutionHeight);
}
LayoutSize RenderBoxModelObject::calculateImageIntrinsicDimensions(StyleImage* image, const LayoutSize& positioningAreaSize, ScaleByEffectiveZoomOrNot shouldScaleOrNot) const
{
// A generated image without a fixed size, will always return the container size as intrinsic size.
if (image->isGeneratedImage() && image->usesImageContainerSize())
return LayoutSize(positioningAreaSize.width(), positioningAreaSize.height());
Length intrinsicWidth;
Length intrinsicHeight;
FloatSize intrinsicRatio;
image->computeIntrinsicDimensions(this, intrinsicWidth, intrinsicHeight, intrinsicRatio);
ASSERT(!intrinsicWidth.isPercent());
ASSERT(!intrinsicHeight.isPercent());
LayoutSize resolvedSize(intrinsicWidth.value(), intrinsicHeight.value());
LayoutSize minimumSize(resolvedSize.width() > 0 ? 1 : 0, resolvedSize.height() > 0 ? 1 : 0);
if (shouldScaleOrNot == ScaleByEffectiveZoom)
resolvedSize.scale(style().effectiveZoom());
resolvedSize.clampToMinimumSize(minimumSize);
if (!resolvedSize.isEmpty())
return resolvedSize;
// If the image has one of either an intrinsic width or an intrinsic height:
// * and an intrinsic aspect ratio, then the missing dimension is calculated from the given dimension and the ratio.
// * and no intrinsic aspect ratio, then the missing dimension is assumed to be the size of the rectangle that
// establishes the coordinate system for the 'background-position' property.
if (resolvedSize.width() > 0 || resolvedSize.height() > 0)
return resolveAgainstIntrinsicWidthOrHeightAndRatio(positioningAreaSize, intrinsicRatio, resolvedSize.width(), resolvedSize.height());
// If the image has no intrinsic dimensions and has an intrinsic ratio the dimensions must be assumed to be the
// largest dimensions at that ratio such that neither dimension exceeds the dimensions of the rectangle that
// establishes the coordinate system for the 'background-position' property.
if (!intrinsicRatio.isEmpty())
return resolveAgainstIntrinsicRatio(positioningAreaSize, intrinsicRatio);
// If the image has no intrinsic ratio either, then the dimensions must be assumed to be the rectangle that
// establishes the coordinate system for the 'background-position' property.
return positioningAreaSize;
}
LayoutSize RenderBoxModelObject::calculateFillTileSize(const FillLayer* fillLayer, const LayoutSize& positioningAreaSize) const
{
StyleImage* image = fillLayer->image();
EFillSizeType type = fillLayer->size().type;
LayoutSize imageIntrinsicSize = calculateImageIntrinsicDimensions(image, positioningAreaSize, ScaleByEffectiveZoom);
imageIntrinsicSize.scale(1 / image->imageScaleFactor(), 1 / image->imageScaleFactor());
switch (type) {
case SizeLength: {
LayoutSize tileSize = positioningAreaSize;
Length layerWidth = fillLayer->size().size.width();
Length layerHeight = fillLayer->size().size.height();
if (layerWidth.isFixed())
tileSize.setWidth(layerWidth.value());
else if (layerWidth.isPercent())
tileSize.setWidth(valueForLength(layerWidth, positioningAreaSize.width()));
if (layerHeight.isFixed())
tileSize.setHeight(layerHeight.value());
else if (layerHeight.isPercent())
tileSize.setHeight(valueForLength(layerHeight, positioningAreaSize.height()));
// If one of the values is auto we have to use the appropriate
// scale to maintain our aspect ratio.
if (layerWidth.isAuto() && !layerHeight.isAuto()) {
if (imageIntrinsicSize.height())
tileSize.setWidth(imageIntrinsicSize.width() * tileSize.height() / imageIntrinsicSize.height());
} else if (!layerWidth.isAuto() && layerHeight.isAuto()) {
if (imageIntrinsicSize.width())
tileSize.setHeight(imageIntrinsicSize.height() * tileSize.width() / imageIntrinsicSize.width());
} else if (layerWidth.isAuto() && layerHeight.isAuto()) {
// If both width and height are auto, use the image's intrinsic size.
tileSize = imageIntrinsicSize;
}
tileSize.clampNegativeToZero();
return tileSize;
}
case SizeNone: {
// If both values are ‘auto’ then the intrinsic width and/or height of the image should be used, if any.
if (!imageIntrinsicSize.isEmpty())
return imageIntrinsicSize;
// If the image has neither an intrinsic width nor an intrinsic height, its size is determined as for ‘contain’.
type = Contain;
}
FALLTHROUGH;
case Contain:
case Cover: {
// Scale computation needs higher precision than what LayoutUnit can offer.
FloatSize localImageIntrinsicSize = imageIntrinsicSize;
FloatSize localPositioningAreaSize = positioningAreaSize;
float horizontalScaleFactor = localImageIntrinsicSize.width() ? (localPositioningAreaSize.width() / localImageIntrinsicSize.width()) : 1;
float verticalScaleFactor = localImageIntrinsicSize.height() ? (localPositioningAreaSize.height() / localImageIntrinsicSize.height()) : 1;
float scaleFactor = type == Contain ? std::min(horizontalScaleFactor, verticalScaleFactor) : std::max(horizontalScaleFactor, verticalScaleFactor);
float deviceScaleFactor = document().deviceScaleFactor();
return LayoutSize(std::max<LayoutUnit>(1 / deviceScaleFactor, localImageIntrinsicSize.width() * scaleFactor),
std::max<LayoutUnit>(1 / deviceScaleFactor, localImageIntrinsicSize.height() * scaleFactor));
}
}
ASSERT_NOT_REACHED();
return LayoutSize();
}
void BackgroundImageGeometry::setNoRepeatX(LayoutUnit xOffset)
{
m_destRect.move(std::max<LayoutUnit>(xOffset, 0), 0);
m_phase.setX(-std::min<LayoutUnit>(xOffset, 0));
m_destRect.setWidth(m_tileSize.width() + std::min<float>(xOffset, 0));
}
void BackgroundImageGeometry::setNoRepeatY(LayoutUnit yOffset)
{
m_destRect.move(0, std::max<LayoutUnit>(yOffset, 0));
m_phase.setY(-std::min<LayoutUnit>(yOffset, 0));
m_destRect.setHeight(m_tileSize.height() + std::min<float>(yOffset, 0));
}
void BackgroundImageGeometry::useFixedAttachment(const LayoutPoint& attachmentPoint)
{
FloatPoint alignedPoint = attachmentPoint;
m_phase.move(std::max<LayoutUnit>(alignedPoint.x() - m_destRect.x(), 0), std::max<LayoutUnit>(alignedPoint.y() - m_destRect.y(), 0));
}
void BackgroundImageGeometry::clip(const LayoutRect& clipRect)
{
m_destRect.intersect(clipRect);
}
LayoutPoint BackgroundImageGeometry::relativePhase() const
{
LayoutPoint phase = m_phase;
phase += m_destRect.location() - m_destOrigin;
return phase;
}
bool RenderBoxModelObject::fixedBackgroundPaintsInLocalCoordinates() const
{
if (!isRoot())
return false;
if (view().frameView().paintBehavior() & PaintBehaviorFlattenCompositingLayers)
return false;
RenderLayer* rootLayer = view().layer();
if (!rootLayer || !rootLayer->isComposited())
return false;
return rootLayer->backing()->backgroundLayerPaintsFixedRootBackground();
}
static inline LayoutUnit getSpace(LayoutUnit areaSize, LayoutUnit tileSize)
{
int numberOfTiles = areaSize / tileSize;
LayoutUnit space = -1;
if (numberOfTiles > 1)
space = (areaSize - numberOfTiles * tileSize) / (numberOfTiles - 1);
return space;
}
void RenderBoxModelObject::pixelSnapBackgroundImageGeometryForPainting(BackgroundImageGeometry& geometry) const
{
float deviceScaleFactor = document().deviceScaleFactor();
// FIXME: We need a better rounding strategy to round/space out tiles.
geometry.setTileSize(LayoutSize(snapRectToDevicePixels(LayoutRect(geometry.destRect().location(), geometry.tileSize()), deviceScaleFactor).size()));
geometry.setSpaceSize(LayoutSize(snapRectToDevicePixels(LayoutRect(LayoutPoint(), geometry.spaceSize()), deviceScaleFactor).size()));
geometry.setDestOrigin(LayoutPoint(roundPointToDevicePixels(geometry.destOrigin(), deviceScaleFactor)));
geometry.setDestRect(LayoutRect(snapRectToDevicePixels(geometry.destRect(), deviceScaleFactor)));
geometry.setPhase(LayoutPoint(roundPointToDevicePixels(geometry.phase(), deviceScaleFactor)));
}
void RenderBoxModelObject::calculateBackgroundImageGeometry(const RenderLayerModelObject* paintContainer, const FillLayer* fillLayer, const LayoutRect& paintRect,
BackgroundImageGeometry& geometry, RenderElement* backgroundObject) const
{
LayoutUnit left = 0;
LayoutUnit top = 0;
LayoutSize positioningAreaSize;
// Determine the background positioning area and set destRect to the background painting area.
// destRect will be adjusted later if the background is non-repeating.
// FIXME: transforms spec says that fixed backgrounds behave like scroll inside transforms. https://bugs.webkit.org/show_bug.cgi?id=15679
bool fixedAttachment = fillLayer->attachment() == FixedBackgroundAttachment;
if (!fixedAttachment) {
geometry.setDestRect(paintRect);
LayoutUnit right = 0;
LayoutUnit bottom = 0;
// Scroll and Local.
if (fillLayer->origin() != BorderFillBox) {
left = borderLeft();
right = borderRight();
top = borderTop();
bottom = borderBottom();
if (fillLayer->origin() == ContentFillBox) {
left += paddingLeft();
right += paddingRight();
top += paddingTop();
bottom += paddingBottom();
}
}
// The background of the box generated by the root element covers the entire canvas including
// its margins. Since those were added in already, we have to factor them out when computing
// the background positioning area.
if (isRoot()) {
positioningAreaSize = downcast<RenderBox>(*this).size() - LayoutSize(left + right, top + bottom);
if (view().frameView().hasExtendedBackgroundRectForPainting()) {
LayoutRect extendedBackgroundRect = view().frameView().extendedBackgroundRectForPainting();
left += (marginLeft() - extendedBackgroundRect.x());
top += (marginTop() - extendedBackgroundRect.y());
}
} else
positioningAreaSize = paintRect.size() - LayoutSize(left + right, top + bottom);
} else {
geometry.setHasNonLocalGeometry();
LayoutRect viewportRect;
if (frame().settings().fixedBackgroundsPaintRelativeToDocument())
viewportRect = view().unscaledDocumentRect();
else {
viewportRect.setSize(view().frameView().unscaledVisibleContentSizeIncludingObscuredArea());
if (fixedBackgroundPaintsInLocalCoordinates())
viewportRect.setLocation(LayoutPoint());
else {
viewportRect.setLocation(toLayoutPoint(view().frameView().documentScrollOffsetRelativeToViewOrigin()));
top += view().frameView().topContentInset(ScrollView::TopContentInsetType::WebCoreOrPlatformContentInset);
}
}
if (paintContainer)
viewportRect.moveBy(LayoutPoint(-paintContainer->localToAbsolute(FloatPoint())));
geometry.setDestRect(viewportRect);
positioningAreaSize = geometry.destRect().size();
}
auto clientForBackgroundImage = backgroundObject ? backgroundObject : this;
LayoutSize fillTileSize = calculateFillTileSize(fillLayer, positioningAreaSize);
fillLayer->image()->setContainerSizeForRenderer(clientForBackgroundImage, fillTileSize, style().effectiveZoom());
geometry.setTileSize(fillTileSize);
EFillRepeat backgroundRepeatX = fillLayer->repeatX();
EFillRepeat backgroundRepeatY = fillLayer->repeatY();
LayoutUnit availableWidth = positioningAreaSize.width() - geometry.tileSize().width();
LayoutUnit availableHeight = positioningAreaSize.height() - geometry.tileSize().height();
LayoutUnit computedXPosition = minimumValueForLength(fillLayer->xPosition(), availableWidth, false);
if (backgroundRepeatX == RoundFill && positioningAreaSize.width() > 0 && fillTileSize.width() > 0) {
int numTiles = std::max(1, roundToInt(positioningAreaSize.width() / fillTileSize.width()));
if (fillLayer->size().size.height().isAuto() && backgroundRepeatY != RoundFill)
fillTileSize.setHeight(fillTileSize.height() * positioningAreaSize.width() / (numTiles * fillTileSize.width()));
fillTileSize.setWidth(positioningAreaSize.width() / numTiles);
geometry.setTileSize(fillTileSize);
geometry.setPhaseX(geometry.tileSize().width() ? geometry.tileSize().width() - fmodf((computedXPosition + left), geometry.tileSize().width()) : 0);
geometry.setSpaceSize(LayoutSize());
}
LayoutUnit computedYPosition = minimumValueForLength(fillLayer->yPosition(), availableHeight, false);
if (backgroundRepeatY == RoundFill && positioningAreaSize.height() > 0 && fillTileSize.height() > 0) {
int numTiles = std::max(1, roundToInt(positioningAreaSize.height() / fillTileSize.height()));
if (fillLayer->size().size.width().isAuto() && backgroundRepeatX != RoundFill)
fillTileSize.setWidth(fillTileSize.width() * positioningAreaSize.height() / (numTiles * fillTileSize.height()));
fillTileSize.setHeight(positioningAreaSize.height() / numTiles);
geometry.setTileSize(fillTileSize);
geometry.setPhaseY(geometry.tileSize().height() ? geometry.tileSize().height() - fmodf((computedYPosition + top), geometry.tileSize().height()) : 0);
geometry.setSpaceSize(LayoutSize());
}
if (backgroundRepeatX == RepeatFill) {
geometry.setPhaseX(geometry.tileSize().width() ? geometry.tileSize().width() - fmodf(computedXPosition + left, geometry.tileSize().width()): 0);
geometry.setSpaceSize(LayoutSize(0, geometry.spaceSize().height()));
} else if (backgroundRepeatX == SpaceFill && fillTileSize.width() > 0) {
LayoutUnit space = getSpace(positioningAreaSize.width(), geometry.tileSize().width());
LayoutUnit actualWidth = geometry.tileSize().width() + space;
if (space >= 0) {
computedXPosition = minimumValueForLength(Length(), availableWidth, false);
geometry.setSpaceSize(LayoutSize(space, 0));
geometry.setPhaseX(actualWidth ? actualWidth - fmodf((computedXPosition + left), actualWidth) : 0);
} else
backgroundRepeatX = NoRepeatFill;
}
if (backgroundRepeatX == NoRepeatFill) {
LayoutUnit xOffset = fillLayer->backgroundXOrigin() == RightEdge ? availableWidth - computedXPosition : computedXPosition;
geometry.setNoRepeatX(left + xOffset);
geometry.setSpaceSize(LayoutSize(0, geometry.spaceSize().height()));
}
if (backgroundRepeatY == RepeatFill) {
geometry.setPhaseY(geometry.tileSize().height() ? geometry.tileSize().height() - fmodf(computedYPosition + top, geometry.tileSize().height()) : 0);
geometry.setSpaceSize(LayoutSize(geometry.spaceSize().width(), 0));
} else if (backgroundRepeatY == SpaceFill && fillTileSize.height() > 0) {
LayoutUnit space = getSpace(positioningAreaSize.height(), geometry.tileSize().height());
LayoutUnit actualHeight = geometry.tileSize().height() + space;
if (space >= 0) {
computedYPosition = minimumValueForLength(Length(), availableHeight, false);
geometry.setSpaceSize(LayoutSize(geometry.spaceSize().width(), space));
geometry.setPhaseY(actualHeight ? actualHeight - fmodf((computedYPosition + top), actualHeight) : 0);
} else
backgroundRepeatY = NoRepeatFill;
}
if (backgroundRepeatY == NoRepeatFill) {
LayoutUnit yOffset = fillLayer->backgroundYOrigin() == BottomEdge ? availableHeight - computedYPosition : computedYPosition;
geometry.setNoRepeatY(top + yOffset);
geometry.setSpaceSize(LayoutSize(geometry.spaceSize().width(), 0));
}
if (fixedAttachment)
geometry.useFixedAttachment(paintRect.location());
geometry.clip(paintRect);
geometry.setDestOrigin(geometry.destRect().location());
pixelSnapBackgroundImageGeometryForPainting(geometry);
}
void RenderBoxModelObject::getGeometryForBackgroundImage(const RenderLayerModelObject* paintContainer, FloatRect& destRect, FloatPoint& phase, FloatSize& tileSize) const
{
const FillLayer* backgroundLayer = style().backgroundLayers();
BackgroundImageGeometry geometry;
LayoutRect paintRect = LayoutRect(destRect);
calculateBackgroundImageGeometry(paintContainer, backgroundLayer, paintRect, geometry);
phase = geometry.phase();
tileSize = geometry.tileSize();
destRect = geometry.destRect();
}
static LayoutUnit computeBorderImageSide(Length borderSlice, LayoutUnit borderSide, LayoutUnit imageSide, LayoutUnit boxExtent)
{
if (borderSlice.isRelative())
return borderSlice.value() * borderSide;
if (borderSlice.isAuto())
return imageSide;
return valueForLength(borderSlice, boxExtent);
}
bool RenderBoxModelObject::paintNinePieceImage(GraphicsContext* graphicsContext, const LayoutRect& rect, const RenderStyle& style,
const NinePieceImage& ninePieceImage, CompositeOperator op)
{
StyleImage* styleImage = ninePieceImage.image();
if (!styleImage)
return false;
if (!styleImage->isLoaded())
return true; // Never paint a nine-piece image incrementally, but don't paint the fallback borders either.
if (!styleImage->canRender(this, style.effectiveZoom()))
return false;
// FIXME: border-image is broken with full page zooming when tiling has to happen, since the tiling function
// doesn't have any understanding of the zoom that is in effect on the tile.
float deviceScaleFactor = document().deviceScaleFactor();
LayoutRect rectWithOutsets = rect;
rectWithOutsets.expand(style.imageOutsets(ninePieceImage));
LayoutRect borderImageRect = LayoutRect(snapRectToDevicePixels(rectWithOutsets, deviceScaleFactor));
LayoutSize imageSize = calculateImageIntrinsicDimensions(styleImage, borderImageRect.size(), DoNotScaleByEffectiveZoom);
// If both values are ‘auto’ then the intrinsic width and/or height of the image should be used, if any.
styleImage->setContainerSizeForRenderer(this, imageSize, style.effectiveZoom());
LayoutUnit imageWidth = imageSize.width();
LayoutUnit imageHeight = imageSize.height();
float imageScaleFactor = styleImage->imageScaleFactor();
LayoutUnit topSlice = std::min<LayoutUnit>(imageHeight, valueForLength(ninePieceImage.imageSlices().top(), imageHeight)) * imageScaleFactor;
LayoutUnit rightSlice = std::min<LayoutUnit>(imageWidth, valueForLength(ninePieceImage.imageSlices().right(), imageWidth)) * imageScaleFactor;
LayoutUnit bottomSlice = std::min<LayoutUnit>(imageHeight, valueForLength(ninePieceImage.imageSlices().bottom(), imageHeight)) * imageScaleFactor;
LayoutUnit leftSlice = std::min<LayoutUnit>(imageWidth, valueForLength(ninePieceImage.imageSlices().left(), imageWidth)) * imageScaleFactor;
ENinePieceImageRule hRule = ninePieceImage.horizontalRule();
ENinePieceImageRule vRule = ninePieceImage.verticalRule();
LayoutUnit topWidth = computeBorderImageSide(ninePieceImage.borderSlices().top(), style.borderTopWidth(), topSlice, borderImageRect.height());
LayoutUnit rightWidth = computeBorderImageSide(ninePieceImage.borderSlices().right(), style.borderRightWidth(), rightSlice, borderImageRect.width());
LayoutUnit bottomWidth = computeBorderImageSide(ninePieceImage.borderSlices().bottom(), style.borderBottomWidth(), bottomSlice, borderImageRect.height());
LayoutUnit leftWidth = computeBorderImageSide(ninePieceImage.borderSlices().left(), style.borderLeftWidth(), leftSlice, borderImageRect.width());
// Reduce the widths if they're too large.
// The spec says: Given Lwidth as the width of the border image area, Lheight as its height, and Wside as the border image width
// offset for the side, let f = min(Lwidth/(Wleft+Wright), Lheight/(Wtop+Wbottom)). If f < 1, then all W are reduced by
// multiplying them by f.
LayoutUnit borderSideWidth = std::max<LayoutUnit>(1 / deviceScaleFactor, leftWidth + rightWidth);
LayoutUnit borderSideHeight = std::max<LayoutUnit>(1 / deviceScaleFactor, topWidth + bottomWidth);
float borderSideScaleFactor = std::min((float)borderImageRect.width() / borderSideWidth, (float)borderImageRect.height() / borderSideHeight);
if (borderSideScaleFactor < 1) {
topWidth *= borderSideScaleFactor;
rightWidth *= borderSideScaleFactor;
bottomWidth *= borderSideScaleFactor;
leftWidth *= borderSideScaleFactor;
}
bool drawLeft = leftSlice > 0 && leftWidth > 0;
bool drawTop = topSlice > 0 && topWidth > 0;
bool drawRight = rightSlice > 0 && rightWidth > 0;
bool drawBottom = bottomSlice > 0 && bottomWidth > 0;
bool drawMiddle = ninePieceImage.fill() && (imageWidth - leftSlice - rightSlice) > 0 && (borderImageRect.width() - leftWidth - rightWidth) > 0
&& (imageHeight - topSlice - bottomSlice) > 0 && (borderImageRect.height() - topWidth - bottomWidth) > 0;
RefPtr<Image> image = styleImage->image(this, imageSize);
ColorSpace colorSpace = style.colorSpace();
float destinationWidth = borderImageRect.width() - leftWidth - rightWidth;
float destinationHeight = borderImageRect.height() - topWidth - bottomWidth;
float sourceWidth = imageWidth - leftSlice - rightSlice;
float sourceHeight = imageHeight - topSlice - bottomSlice;
float leftSideScale = drawLeft ? (float)leftWidth / leftSlice : 1;
float rightSideScale = drawRight ? (float)rightWidth / rightSlice : 1;
float topSideScale = drawTop ? (float)topWidth / topSlice : 1;
float bottomSideScale = drawBottom ? (float)bottomWidth / bottomSlice : 1;
float x = borderImageRect.location().x();
float y = borderImageRect.location().y();
if (drawLeft) {
// Paint the top and bottom left corners.
// The top left corner rect is (tx, ty, leftWidth, topWidth)
// The rect to use from within the image is obtained from our slice, and is (0, 0, leftSlice, topSlice)
if (drawTop)
graphicsContext->drawImage(image.get(), colorSpace, snapRectToDevicePixels(x, y, leftWidth, topWidth, deviceScaleFactor),
snapRectToDevicePixels(0, 0, leftSlice, topSlice, deviceScaleFactor), op);
// The bottom left corner rect is (tx, ty + h - bottomWidth, leftWidth, bottomWidth)
// The rect to use from within the image is (0, imageHeight - bottomSlice, leftSlice, botomSlice)
if (drawBottom)
graphicsContext->drawImage(image.get(), colorSpace, snapRectToDevicePixels(x, borderImageRect.maxY() - bottomWidth, leftWidth, bottomWidth, deviceScaleFactor),
snapRectToDevicePixels(0, imageHeight - bottomSlice, leftSlice, bottomSlice, deviceScaleFactor), op);
// Paint the left edge.
// Have to scale and tile into the border rect.
if (sourceHeight > 0)
graphicsContext->drawTiledImage(image.get(), colorSpace, snapRectToDevicePixels(x, y + topWidth, leftWidth, destinationHeight, deviceScaleFactor),
snapRectToDevicePixels(0, topSlice, leftSlice, sourceHeight, deviceScaleFactor), FloatSize(leftSideScale, leftSideScale), Image::StretchTile, (Image::TileRule)vRule, op);
}
if (drawRight) {
// Paint the top and bottom right corners
// The top right corner rect is (tx + w - rightWidth, ty, rightWidth, topWidth)
// The rect to use from within the image is obtained from our slice, and is (imageWidth - rightSlice, 0, rightSlice, topSlice)
if (drawTop)
graphicsContext->drawImage(image.get(), colorSpace, snapRectToDevicePixels(borderImageRect.maxX() - rightWidth, y, rightWidth, topWidth, deviceScaleFactor),
snapRectToDevicePixels(imageWidth - rightSlice, 0, rightSlice, topSlice, deviceScaleFactor), op);
// The bottom right corner rect is (tx + w - rightWidth, ty + h - bottomWidth, rightWidth, bottomWidth)
// The rect to use from within the image is (imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, bottomSlice)
if (drawBottom)
graphicsContext->drawImage(image.get(), colorSpace, snapRectToDevicePixels(borderImageRect.maxX() - rightWidth, borderImageRect.maxY() - bottomWidth,
rightWidth, bottomWidth, deviceScaleFactor), snapRectToDevicePixels(imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, bottomSlice, deviceScaleFactor),
op);
// Paint the right edge.
if (sourceHeight > 0)
graphicsContext->drawTiledImage(image.get(), colorSpace, snapRectToDevicePixels(borderImageRect.maxX() - rightWidth, y + topWidth, rightWidth, destinationHeight, deviceScaleFactor),
snapRectToDevicePixels(imageWidth - rightSlice, topSlice, rightSlice, sourceHeight, deviceScaleFactor), FloatSize(rightSideScale, rightSideScale),
Image::StretchTile, (Image::TileRule)vRule, op);
}
// Paint the top edge.
if (drawTop && sourceWidth > 0)
graphicsContext->drawTiledImage(image.get(), colorSpace, snapRectToDevicePixels(x + leftWidth, y, destinationWidth, topWidth, deviceScaleFactor),
snapRectToDevicePixels(leftSlice, 0, sourceWidth, topSlice, deviceScaleFactor), FloatSize(topSideScale, topSideScale), (Image::TileRule)hRule, Image::StretchTile, op);
// Paint the bottom edge.
if (drawBottom && sourceWidth > 0)
graphicsContext->drawTiledImage(image.get(), colorSpace, snapRectToDevicePixels(x + leftWidth, borderImageRect.maxY() - bottomWidth, destinationWidth, bottomWidth, deviceScaleFactor),
snapRectToDevicePixels(leftSlice, imageHeight - bottomSlice, sourceWidth, bottomSlice, deviceScaleFactor), FloatSize(bottomSideScale, bottomSideScale),
(Image::TileRule)hRule, Image::StretchTile, op);
// Paint the middle.
if (drawMiddle) {
FloatSize middleScaleFactor(1, 1);
if (drawTop)
middleScaleFactor.setWidth(topSideScale);
else if (drawBottom)
middleScaleFactor.setWidth(bottomSideScale);
if (drawLeft)
middleScaleFactor.setHeight(leftSideScale);
else if (drawRight)
middleScaleFactor.setHeight(rightSideScale);
// For "stretch" rules, just override the scale factor and replace. We only had to do this for the
// center tile, since sides don't even use the scale factor unless they have a rule other than "stretch".
// The middle however can have "stretch" specified in one axis but not the other, so we have to
// correct the scale here.
if (hRule == StretchImageRule)
middleScaleFactor.setWidth(destinationWidth / sourceWidth);
if (vRule == StretchImageRule)
middleScaleFactor.setHeight(destinationHeight / sourceHeight);
graphicsContext->drawTiledImage(image.get(), colorSpace,
snapRectToDevicePixels(x + leftWidth, y + topWidth, destinationWidth, destinationHeight, deviceScaleFactor),
snapRectToDevicePixels(leftSlice, topSlice, sourceWidth, sourceHeight, deviceScaleFactor),
middleScaleFactor, (Image::TileRule)hRule, (Image::TileRule)vRule, op);
}
return true;
}
static bool allCornersClippedOut(const RoundedRect& border, const LayoutRect& clipRect)
{
LayoutRect boundingRect = border.rect();
if (clipRect.contains(boundingRect))
return false;
RoundedRect::Radii radii = border.radii();
LayoutRect topLeftRect(boundingRect.location(), radii.topLeft());
if (clipRect.intersects(topLeftRect))
return false;
LayoutRect topRightRect(boundingRect.location(), radii.topRight());
topRightRect.setX(boundingRect.maxX() - topRightRect.width());
if (clipRect.intersects(topRightRect))
return false;
LayoutRect bottomLeftRect(boundingRect.location(), radii.bottomLeft());
bottomLeftRect.setY(boundingRect.maxY() - bottomLeftRect.height());
if (clipRect.intersects(bottomLeftRect))
return false;
LayoutRect bottomRightRect(boundingRect.location(), radii.bottomRight());
bottomRightRect.setX(boundingRect.maxX() - bottomRightRect.width());
bottomRightRect.setY(boundingRect.maxY() - bottomRightRect.height());
if (clipRect.intersects(bottomRightRect))
return false;
return true;
}
static bool borderWillArcInnerEdge(const LayoutSize& firstRadius, const FloatSize& secondRadius)
{
return !firstRadius.isZero() || !secondRadius.isZero();
}
inline bool styleRequiresClipPolygon(EBorderStyle style)
{
return style == DOTTED || style == DASHED; // These are drawn with a stroke, so we have to clip to get corner miters.
}
static bool borderStyleFillsBorderArea(EBorderStyle style)
{
return !(style == DOTTED || style == DASHED || style == DOUBLE);
}
static bool borderStyleHasInnerDetail(EBorderStyle style)
{
return style == GROOVE || style == RIDGE || style == DOUBLE;
}
static bool borderStyleIsDottedOrDashed(EBorderStyle style)
{
return style == DOTTED || style == DASHED;
}
// OUTSET darkens the bottom and right (and maybe lightens the top and left)
// INSET darkens the top and left (and maybe lightens the bottom and right)
static inline bool borderStyleHasUnmatchedColorsAtCorner(EBorderStyle style, BoxSide side, BoxSide adjacentSide)
{
// These styles match at the top/left and bottom/right.
if (style == INSET || style == GROOVE || style == RIDGE || style == OUTSET) {
const BorderEdgeFlags topRightFlags = edgeFlagForSide(BSTop) | edgeFlagForSide(BSRight);
const BorderEdgeFlags bottomLeftFlags = edgeFlagForSide(BSBottom) | edgeFlagForSide(BSLeft);
BorderEdgeFlags flags = edgeFlagForSide(side) | edgeFlagForSide(adjacentSide);
return flags == topRightFlags || flags == bottomLeftFlags;
}
return false;
}
static inline bool colorsMatchAtCorner(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
if (edges[side].shouldRender() != edges[adjacentSide].shouldRender())
return false;
if (!edgesShareColor(edges[side], edges[adjacentSide]))
return false;
return !borderStyleHasUnmatchedColorsAtCorner(edges[side].style(), side, adjacentSide);
}
static inline bool colorNeedsAntiAliasAtCorner(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
if (!edges[side].color().hasAlpha())
return false;
if (edges[side].shouldRender() != edges[adjacentSide].shouldRender())
return false;
if (!edgesShareColor(edges[side], edges[adjacentSide]))
return true;
return borderStyleHasUnmatchedColorsAtCorner(edges[side].style(), side, adjacentSide);
}
// This assumes that we draw in order: top, bottom, left, right.
static inline bool willBeOverdrawn(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
switch (side) {
case BSTop:
case BSBottom:
if (edges[adjacentSide].presentButInvisible())
return false;
if (!edgesShareColor(edges[side], edges[adjacentSide]) && edges[adjacentSide].color().hasAlpha())
return false;
if (!borderStyleFillsBorderArea(edges[adjacentSide].style()))
return false;
return true;
case BSLeft:
case BSRight:
// These draw last, so are never overdrawn.
return false;
}
return false;
}
static inline bool borderStylesRequireMitre(BoxSide side, BoxSide adjacentSide, EBorderStyle style, EBorderStyle adjacentStyle)
{
if (style == DOUBLE || adjacentStyle == DOUBLE || adjacentStyle == GROOVE || adjacentStyle == RIDGE)
return true;
if (borderStyleIsDottedOrDashed(style) != borderStyleIsDottedOrDashed(adjacentStyle))
return true;
if (style != adjacentStyle)
return true;
return borderStyleHasUnmatchedColorsAtCorner(style, side, adjacentSide);
}
static bool joinRequiresMitre(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[], bool allowOverdraw)
{
if ((edges[side].isTransparent() && edges[adjacentSide].isTransparent()) || !edges[adjacentSide].isPresent())
return false;
if (allowOverdraw && willBeOverdrawn(side, adjacentSide, edges))
return false;
if (!edgesShareColor(edges[side], edges[adjacentSide]))
return true;
if (borderStylesRequireMitre(side, adjacentSide, edges[side].style(), edges[adjacentSide].style()))
return true;
return false;
}
void RenderBoxModelObject::paintOneBorderSide(GraphicsContext* graphicsContext, const RenderStyle& style, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
const LayoutRect& sideRect, BoxSide side, BoxSide adjacentSide1, BoxSide adjacentSide2, const BorderEdge edges[], const Path* path,
BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor)
{
const BorderEdge& edgeToRender = edges[side];
ASSERT(edgeToRender.widthForPainting());
const BorderEdge& adjacentEdge1 = edges[adjacentSide1];
const BorderEdge& adjacentEdge2 = edges[adjacentSide2];
bool mitreAdjacentSide1 = joinRequiresMitre(side, adjacentSide1, edges, !antialias);
bool mitreAdjacentSide2 = joinRequiresMitre(side, adjacentSide2, edges, !antialias);
bool adjacentSide1StylesMatch = colorsMatchAtCorner(side, adjacentSide1, edges);
bool adjacentSide2StylesMatch = colorsMatchAtCorner(side, adjacentSide2, edges);
const Color& colorToPaint = overrideColor ? *overrideColor : edgeToRender.color();
if (path) {
GraphicsContextStateSaver stateSaver(*graphicsContext);
if (innerBorder.isRenderable())
clipBorderSidePolygon(graphicsContext, outerBorder, innerBorder, side, adjacentSide1StylesMatch, adjacentSide2StylesMatch);
else
clipBorderSideForComplexInnerPath(graphicsContext, outerBorder, innerBorder, side, edges);
float thickness = std::max(std::max(edgeToRender.widthForPainting(), adjacentEdge1.widthForPainting()), adjacentEdge2.widthForPainting());
drawBoxSideFromPath(graphicsContext, outerBorder.rect(), *path, edges, edgeToRender.widthForPainting(), thickness, side, style,
colorToPaint, edgeToRender.style(), bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
} else {
bool clipForStyle = styleRequiresClipPolygon(edgeToRender.style()) && (mitreAdjacentSide1 || mitreAdjacentSide2);
bool clipAdjacentSide1 = colorNeedsAntiAliasAtCorner(side, adjacentSide1, edges) && mitreAdjacentSide1;
bool clipAdjacentSide2 = colorNeedsAntiAliasAtCorner(side, adjacentSide2, edges) && mitreAdjacentSide2;
bool shouldClip = clipForStyle || clipAdjacentSide1 || clipAdjacentSide2;
GraphicsContextStateSaver clipStateSaver(*graphicsContext, shouldClip);
if (shouldClip) {
bool aliasAdjacentSide1 = clipAdjacentSide1 || (clipForStyle && mitreAdjacentSide1);
bool aliasAdjacentSide2 = clipAdjacentSide2 || (clipForStyle && mitreAdjacentSide2);
clipBorderSidePolygon(graphicsContext, outerBorder, innerBorder, side, !aliasAdjacentSide1, !aliasAdjacentSide2);
// Since we clipped, no need to draw with a mitre.
mitreAdjacentSide1 = false;
mitreAdjacentSide2 = false;
}
drawLineForBoxSide(graphicsContext, sideRect.x(), sideRect.y(), sideRect.maxX(), sideRect.maxY(), side, colorToPaint, edgeToRender.style(),
mitreAdjacentSide1 ? adjacentEdge1.widthForPainting() : 0, mitreAdjacentSide2 ? adjacentEdge2.widthForPainting() : 0, antialias);
}
}
static LayoutRect calculateSideRect(const RoundedRect& outerBorder, const BorderEdge edges[], int side)
{
LayoutRect sideRect = outerBorder.rect();
float width = edges[side].widthForPainting();
if (side == BSTop)
sideRect.setHeight(width);
else if (side == BSBottom)
sideRect.shiftYEdgeTo(sideRect.maxY() - width);
else if (side == BSLeft)
sideRect.setWidth(width);
else
sideRect.shiftXEdgeTo(sideRect.maxX() - width);
return sideRect;
}
void RenderBoxModelObject::paintBorderSides(GraphicsContext* graphicsContext, const RenderStyle& style, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
const IntPoint& innerBorderAdjustment, const BorderEdge edges[], BorderEdgeFlags edgeSet, BackgroundBleedAvoidance bleedAvoidance,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor)
{
bool renderRadii = outerBorder.isRounded();
Path roundedPath;
if (renderRadii)
roundedPath.addRoundedRect(outerBorder);
// The inner border adjustment for bleed avoidance mode BackgroundBleedBackgroundOverBorder
// is only applied to sideRect, which is okay since BackgroundBleedBackgroundOverBorder
// is only to be used for solid borders and the shape of the border painted by drawBoxSideFromPath
// only depends on sideRect when painting solid borders.
if (edges[BSTop].shouldRender() && includesEdge(edgeSet, BSTop)) {
LayoutRect sideRect = outerBorder.rect();
sideRect.setHeight(edges[BSTop].widthForPainting() + innerBorderAdjustment.y());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSTop].style()) || borderWillArcInnerEdge(innerBorder.radii().topLeft(), innerBorder.radii().topRight()));
paintOneBorderSide(graphicsContext, style, outerBorder, innerBorder, sideRect, BSTop, BSLeft, BSRight, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSBottom].shouldRender() && includesEdge(edgeSet, BSBottom)) {
LayoutRect sideRect = outerBorder.rect();
sideRect.shiftYEdgeTo(sideRect.maxY() - edges[BSBottom].widthForPainting() - innerBorderAdjustment.y());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSBottom].style()) || borderWillArcInnerEdge(innerBorder.radii().bottomLeft(), innerBorder.radii().bottomRight()));
paintOneBorderSide(graphicsContext, style, outerBorder, innerBorder, sideRect, BSBottom, BSLeft, BSRight, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSLeft].shouldRender() && includesEdge(edgeSet, BSLeft)) {
LayoutRect sideRect = outerBorder.rect();
sideRect.setWidth(edges[BSLeft].widthForPainting() + innerBorderAdjustment.x());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSLeft].style()) || borderWillArcInnerEdge(innerBorder.radii().bottomLeft(), innerBorder.radii().topLeft()));
paintOneBorderSide(graphicsContext, style, outerBorder, innerBorder, sideRect, BSLeft, BSTop, BSBottom, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSRight].shouldRender() && includesEdge(edgeSet, BSRight)) {
LayoutRect sideRect = outerBorder.rect();
sideRect.shiftXEdgeTo(sideRect.maxX() - edges[BSRight].widthForPainting() - innerBorderAdjustment.x());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSRight].style()) || borderWillArcInnerEdge(innerBorder.radii().bottomRight(), innerBorder.radii().topRight()));
paintOneBorderSide(graphicsContext, style, outerBorder, innerBorder, sideRect, BSRight, BSTop, BSBottom, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
}
void RenderBoxModelObject::paintTranslucentBorderSides(GraphicsContext* graphicsContext, const RenderStyle& style, const RoundedRect& outerBorder, const RoundedRect& innerBorder, const IntPoint& innerBorderAdjustment,
const BorderEdge edges[], BorderEdgeFlags edgesToDraw, BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias)
{
// willBeOverdrawn assumes that we draw in order: top, bottom, left, right.
// This is different from BoxSide enum order.
static BoxSide paintOrder[] = { BSTop, BSBottom, BSLeft, BSRight };
while (edgesToDraw) {
// Find undrawn edges sharing a color.
Color commonColor;
BorderEdgeFlags commonColorEdgeSet = 0;
for (size_t i = 0; i < sizeof(paintOrder) / sizeof(paintOrder[0]); ++i) {
BoxSide currSide = paintOrder[i];
if (!includesEdge(edgesToDraw, currSide))
continue;
bool includeEdge;
if (!commonColorEdgeSet) {
commonColor = edges[currSide].color();
includeEdge = true;
} else
includeEdge = edges[currSide].color() == commonColor;
if (includeEdge)
commonColorEdgeSet |= edgeFlagForSide(currSide);
}
bool useTransparencyLayer = includesAdjacentEdges(commonColorEdgeSet) && commonColor.hasAlpha();
if (useTransparencyLayer) {
graphicsContext->beginTransparencyLayer(static_cast<float>(commonColor.alpha()) / 255);
commonColor = Color(commonColor.red(), commonColor.green(), commonColor.blue());
}
paintBorderSides(graphicsContext, style, outerBorder, innerBorder, innerBorderAdjustment, edges, commonColorEdgeSet, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, &commonColor);
if (useTransparencyLayer)
graphicsContext->endTransparencyLayer();
edgesToDraw &= ~commonColorEdgeSet;
}
}
void RenderBoxModelObject::paintBorder(const PaintInfo& info, const LayoutRect& rect, const RenderStyle& style,
BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
GraphicsContext* graphicsContext = info.context;
if (graphicsContext->paintingDisabled())
return;
if (rect.isEmpty())
return;
// border-image is not affected by border-radius.
if (paintNinePieceImage(graphicsContext, rect, style, style.borderImage()))
return;
BorderEdge edges[4];
BorderEdge::getBorderEdgeInfo(edges, style, document().deviceScaleFactor(), includeLogicalLeftEdge, includeLogicalRightEdge);
RoundedRect outerBorder = style.getRoundedBorderFor(rect, includeLogicalLeftEdge, includeLogicalRightEdge);
RoundedRect innerBorder = style.getRoundedInnerBorderFor(borderInnerRectAdjustedForBleedAvoidance(*graphicsContext, rect, bleedAvoidance), includeLogicalLeftEdge, includeLogicalRightEdge);
bool haveAlphaColor = false;
bool haveAllSolidEdges = true;
bool haveAllDoubleEdges = true;
int numEdgesVisible = 4;
bool allEdgesShareColor = true;
int firstVisibleEdge = -1;
BorderEdgeFlags edgesToDraw = 0;
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
if (edges[i].shouldRender())
edgesToDraw |= edgeFlagForSide(static_cast<BoxSide>(i));
if (currEdge.presentButInvisible()) {
--numEdgesVisible;
allEdgesShareColor = false;
continue;
}
if (!currEdge.widthForPainting()) {
--numEdgesVisible;
continue;
}
if (firstVisibleEdge == -1)
firstVisibleEdge = i;
else if (currEdge.color() != edges[firstVisibleEdge].color())
allEdgesShareColor = false;
if (currEdge.color().hasAlpha())
haveAlphaColor = true;
if (currEdge.style() != SOLID)
haveAllSolidEdges = false;
if (currEdge.style() != DOUBLE)
haveAllDoubleEdges = false;
}
// If no corner intersects the clip region, we can pretend outerBorder is
// rectangular to improve performance.
if (haveAllSolidEdges && outerBorder.isRounded() && allCornersClippedOut(outerBorder, info.rect))
outerBorder.setRadii(RoundedRect::Radii());
float deviceScaleFactor = document().deviceScaleFactor();
// isRenderable() check avoids issue described in https://bugs.webkit.org/show_bug.cgi?id=38787
if ((haveAllSolidEdges || haveAllDoubleEdges) && allEdgesShareColor && innerBorder.isRenderable()) {
// Fast path for drawing all solid edges and all unrounded double edges
if (numEdgesVisible == 4 && (outerBorder.isRounded() || haveAlphaColor)
&& (haveAllSolidEdges || (!outerBorder.isRounded() && !innerBorder.isRounded()))) {
Path path;
FloatRoundedRect pixelSnappedOuterBorder = outerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
if (pixelSnappedOuterBorder.isRounded() && bleedAvoidance != BackgroundBleedUseTransparencyLayer)
path.addRoundedRect(pixelSnappedOuterBorder);
else
path.addRect(pixelSnappedOuterBorder.rect());
if (haveAllDoubleEdges) {
LayoutRect innerThirdRect = outerBorder.rect();
LayoutRect outerThirdRect = outerBorder.rect();
for (int side = BSTop; side <= BSLeft; ++side) {
LayoutUnit outerWidth;
LayoutUnit innerWidth;
edges[side].getDoubleBorderStripeWidths(outerWidth, innerWidth);
if (side == BSTop) {
innerThirdRect.shiftYEdgeTo(innerThirdRect.y() + innerWidth);
outerThirdRect.shiftYEdgeTo(outerThirdRect.y() + outerWidth);
} else if (side == BSBottom) {
innerThirdRect.setHeight(innerThirdRect.height() - innerWidth);
outerThirdRect.setHeight(outerThirdRect.height() - outerWidth);
} else if (side == BSLeft) {
innerThirdRect.shiftXEdgeTo(innerThirdRect.x() + innerWidth);
outerThirdRect.shiftXEdgeTo(outerThirdRect.x() + outerWidth);
} else {
innerThirdRect.setWidth(innerThirdRect.width() - innerWidth);
outerThirdRect.setWidth(outerThirdRect.width() - outerWidth);
}
}
FloatRoundedRect pixelSnappedOuterThird = outerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
pixelSnappedOuterThird.setRect(snapRectToDevicePixels(outerThirdRect, deviceScaleFactor));
if (pixelSnappedOuterThird.isRounded() && bleedAvoidance != BackgroundBleedUseTransparencyLayer)
path.addRoundedRect(pixelSnappedOuterThird);
else
path.addRect(pixelSnappedOuterThird.rect());
FloatRoundedRect pixelSnappedInnerThird = innerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
pixelSnappedInnerThird.setRect(snapRectToDevicePixels(innerThirdRect, deviceScaleFactor));
if (pixelSnappedInnerThird.isRounded() && bleedAvoidance != BackgroundBleedUseTransparencyLayer)
path.addRoundedRect(pixelSnappedInnerThird);
else
path.addRect(pixelSnappedInnerThird.rect());
}
FloatRoundedRect pixelSnappedInnerBorder = innerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
if (pixelSnappedInnerBorder.isRounded())
path.addRoundedRect(pixelSnappedInnerBorder);
else
path.addRect(pixelSnappedInnerBorder.rect());
graphicsContext->setFillRule(RULE_EVENODD);
graphicsContext->setFillColor(edges[firstVisibleEdge].color(), style.colorSpace());
graphicsContext->fillPath(path);
return;
}
// Avoid creating transparent layers
if (haveAllSolidEdges && numEdgesVisible != 4 && !outerBorder.isRounded() && haveAlphaColor) {
Path path;
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
if (currEdge.shouldRender()) {
LayoutRect sideRect = calculateSideRect(outerBorder, edges, i);
path.addRect(sideRect);
}
}
graphicsContext->setFillRule(RULE_NONZERO);
graphicsContext->setFillColor(edges[firstVisibleEdge].color(), style.colorSpace());
graphicsContext->fillPath(path);
return;
}
}
bool clipToOuterBorder = outerBorder.isRounded();
GraphicsContextStateSaver stateSaver(*graphicsContext, clipToOuterBorder);
if (clipToOuterBorder) {
// Clip to the inner and outer radii rects.
if (bleedAvoidance != BackgroundBleedUseTransparencyLayer)
graphicsContext->clipRoundedRect(outerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor));
// isRenderable() check avoids issue described in https://bugs.webkit.org/show_bug.cgi?id=38787
// The inside will be clipped out later (in clipBorderSideForComplexInnerPath)
if (innerBorder.isRenderable())
graphicsContext->clipOutRoundedRect(innerBorder.pixelSnappedRoundedRectForPainting(deviceScaleFactor));
}
// If only one edge visible antialiasing doesn't create seams
bool antialias = shouldAntialiasLines(graphicsContext) || numEdgesVisible == 1;
RoundedRect unadjustedInnerBorder = (bleedAvoidance == BackgroundBleedBackgroundOverBorder) ? style.getRoundedInnerBorderFor(rect, includeLogicalLeftEdge, includeLogicalRightEdge) : innerBorder;
IntPoint innerBorderAdjustment(innerBorder.rect().x() - unadjustedInnerBorder.rect().x(), innerBorder.rect().y() - unadjustedInnerBorder.rect().y());
if (haveAlphaColor)
paintTranslucentBorderSides(graphicsContext, style, outerBorder, unadjustedInnerBorder, innerBorderAdjustment, edges, edgesToDraw, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias);
else
paintBorderSides(graphicsContext, style, outerBorder, unadjustedInnerBorder, innerBorderAdjustment, edges, edgesToDraw, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias);
}
void RenderBoxModelObject::drawBoxSideFromPath(GraphicsContext* graphicsContext, const LayoutRect& borderRect, const Path& borderPath, const BorderEdge edges[],
float thickness, float drawThickness, BoxSide side, const RenderStyle& style, Color color, EBorderStyle borderStyle, BackgroundBleedAvoidance bleedAvoidance,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
if (thickness <= 0)
return;
if (borderStyle == DOUBLE && thickness < 3)
borderStyle = SOLID;
switch (borderStyle) {
case BNONE:
case BHIDDEN:
return;
case DOTTED:
case DASHED: {
graphicsContext->setStrokeColor(color, style.colorSpace());
// The stroke is doubled here because the provided path is the
// outside edge of the border so half the stroke is clipped off.
// The extra multiplier is so that the clipping mask can antialias
// the edges to prevent jaggies.
graphicsContext->setStrokeThickness(drawThickness * 2 * 1.1f);
graphicsContext->setStrokeStyle(borderStyle == DASHED ? DashedStroke : DottedStroke);
// If the number of dashes that fit in the path is odd and non-integral then we
// will have an awkwardly-sized dash at the end of the path. To try to avoid that
// here, we simply make the whitespace dashes ever so slightly bigger.
// FIXME: This could be even better if we tried to manipulate the dash offset
// and possibly the gapLength to get the corners dash-symmetrical.
float dashLength = thickness * ((borderStyle == DASHED) ? 3.0f : 1.0f);
float gapLength = dashLength;
float numberOfDashes = borderPath.length() / dashLength;
// Don't try to show dashes if we have less than 2 dashes + 2 gaps.
// FIXME: should do this test per side.
if (numberOfDashes >= 4) {
bool evenNumberOfFullDashes = !((int)numberOfDashes % 2);
bool integralNumberOfDashes = !(numberOfDashes - (int)numberOfDashes);
if (!evenNumberOfFullDashes && !integralNumberOfDashes) {
float numberOfGaps = numberOfDashes / 2;
gapLength += (dashLength / numberOfGaps);
}
DashArray lineDash;
lineDash.append(dashLength);
lineDash.append(gapLength);
graphicsContext->setLineDash(lineDash, dashLength);
}
// FIXME: stroking the border path causes issues with tight corners:
// https://bugs.webkit.org/show_bug.cgi?id=58711
// Also, to get the best appearance we should stroke a path between the two borders.
graphicsContext->strokePath(borderPath);
return;
}
case DOUBLE: {
// Get the inner border rects for both the outer border line and the inner border line
LayoutUnit outerBorderTopWidth;
LayoutUnit innerBorderTopWidth;
edges[BSTop].getDoubleBorderStripeWidths(outerBorderTopWidth, innerBorderTopWidth);
LayoutUnit outerBorderRightWidth;
LayoutUnit innerBorderRightWidth;
edges[BSRight].getDoubleBorderStripeWidths(outerBorderRightWidth, innerBorderRightWidth);
LayoutUnit outerBorderBottomWidth;
LayoutUnit innerBorderBottomWidth;
edges[BSBottom].getDoubleBorderStripeWidths(outerBorderBottomWidth, innerBorderBottomWidth);
LayoutUnit outerBorderLeftWidth;
LayoutUnit innerBorderLeftWidth;
edges[BSLeft].getDoubleBorderStripeWidths(outerBorderLeftWidth, innerBorderLeftWidth);
// Draw inner border line
{
GraphicsContextStateSaver stateSaver(*graphicsContext);
RoundedRect innerClip = style.getRoundedInnerBorderFor(borderRect,
innerBorderTopWidth, innerBorderBottomWidth, innerBorderLeftWidth, innerBorderRightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipRoundedRect(FloatRoundedRect(innerClip));
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, SOLID, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
}
// Draw outer border line
{
GraphicsContextStateSaver stateSaver(*graphicsContext);
LayoutRect outerRect = borderRect;
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
outerRect.inflate(1);
++outerBorderTopWidth;
++outerBorderBottomWidth;
++outerBorderLeftWidth;
++outerBorderRightWidth;
}
RoundedRect outerClip = style.getRoundedInnerBorderFor(outerRect,
outerBorderTopWidth, outerBorderBottomWidth, outerBorderLeftWidth, outerBorderRightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipOutRoundedRect(FloatRoundedRect(outerClip));
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, SOLID, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
}
return;
}
case RIDGE:
case GROOVE:
{
EBorderStyle s1;
EBorderStyle s2;
if (borderStyle == GROOVE) {
s1 = INSET;
s2 = OUTSET;
} else {
s1 = OUTSET;
s2 = INSET;
}
// Paint full border
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, s1, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
// Paint inner only
GraphicsContextStateSaver stateSaver(*graphicsContext);
LayoutUnit topWidth = edges[BSTop].widthForPainting() / 2;
LayoutUnit bottomWidth = edges[BSBottom].widthForPainting() / 2;
LayoutUnit leftWidth = edges[BSLeft].widthForPainting() / 2;
LayoutUnit rightWidth = edges[BSRight].widthForPainting() / 2;
RoundedRect clipRect = style.getRoundedInnerBorderFor(borderRect,
topWidth, bottomWidth, leftWidth, rightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipRoundedRect(FloatRoundedRect(clipRect));
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, s2, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
return;
}
case INSET:
if (side == BSTop || side == BSLeft)
color = color.dark();
break;
case OUTSET:
if (side == BSBottom || side == BSRight)
color = color.dark();
break;
default:
break;
}
graphicsContext->setStrokeStyle(NoStroke);
graphicsContext->setFillColor(color, style.colorSpace());
graphicsContext->drawRect(snapRectToDevicePixels(borderRect, document().deviceScaleFactor()));
}
static void findInnerVertex(const FloatPoint& outerCorner, const FloatPoint& innerCorner, const FloatPoint& centerPoint, FloatPoint& result)
{
// If the line between outer and inner corner is towards the horizontal, intersect with a vertical line through the center,
// otherwise with a horizontal line through the center. The points that form this line are arbitrary (we use 0, 100).
// Note that if findIntersection fails, it will leave result untouched.
float diffInnerOuterX = fabs(innerCorner.x() - outerCorner.x());
float diffInnerOuterY = fabs(innerCorner.y() - outerCorner.y());
float diffCenterOuterX = fabs(centerPoint.x() - outerCorner.x());
float diffCenterOuterY = fabs(centerPoint.y() - outerCorner.y());
if (diffInnerOuterY * diffCenterOuterX < diffCenterOuterY * diffInnerOuterX)
findIntersection(outerCorner, innerCorner, FloatPoint(centerPoint.x(), 0), FloatPoint(centerPoint.x(), 100), result);
else
findIntersection(outerCorner, innerCorner, FloatPoint(0, centerPoint.y()), FloatPoint(100, centerPoint.y()), result);
}
void RenderBoxModelObject::clipBorderSidePolygon(GraphicsContext* graphicsContext, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
BoxSide side, bool firstEdgeMatches, bool secondEdgeMatches)
{
FloatPoint quad[4];
const LayoutRect& outerRect = outerBorder.rect();
const LayoutRect& innerRect = innerBorder.rect();
FloatPoint centerPoint(innerRect.location().x() + static_cast<float>(innerRect.width()) / 2, innerRect.location().y() + static_cast<float>(innerRect.height()) / 2);
// For each side, create a quad that encompasses all parts of that side that may draw,
// including areas inside the innerBorder.
//
// 0----------------3
// 0 \ / 0
// |\ 1----------- 2 /|
// | 1 1 |
// | | | |
// | | | |
// | 2 2 |
// |/ 1------------2 \|
// 3 / \ 3
// 0----------------3
//
switch (side) {
case BSTop:
quad[0] = outerRect.minXMinYCorner();
quad[1] = innerRect.minXMinYCorner();
quad[2] = innerRect.maxXMinYCorner();
quad[3] = outerRect.maxXMinYCorner();
if (!innerBorder.radii().topLeft().isZero())
findInnerVertex(outerRect.minXMinYCorner(), innerRect.minXMinYCorner(), centerPoint, quad[1]);
if (!innerBorder.radii().topRight().isZero())
findInnerVertex(outerRect.maxXMinYCorner(), innerRect.maxXMinYCorner(), centerPoint, quad[2]);
break;
case BSLeft:
quad[0] = outerRect.minXMinYCorner();
quad[1] = innerRect.minXMinYCorner();
quad[2] = innerRect.minXMaxYCorner();
quad[3] = outerRect.minXMaxYCorner();
if (!innerBorder.radii().topLeft().isZero())
findInnerVertex(outerRect.minXMinYCorner(), innerRect.minXMinYCorner(), centerPoint, quad[1]);
if (!innerBorder.radii().bottomLeft().isZero())
findInnerVertex(outerRect.minXMaxYCorner(), innerRect.minXMaxYCorner(), centerPoint, quad[2]);
break;
case BSBottom:
quad[0] = outerRect.minXMaxYCorner();
quad[1] = innerRect.minXMaxYCorner();
quad[2] = innerRect.maxXMaxYCorner();
quad[3] = outerRect.maxXMaxYCorner();
if (!innerBorder.radii().bottomLeft().isZero())
findInnerVertex(outerRect.minXMaxYCorner(), innerRect.minXMaxYCorner(), centerPoint, quad[1]);
if (!innerBorder.radii().bottomRight().isZero())
findInnerVertex(outerRect.maxXMaxYCorner(), innerRect.maxXMaxYCorner(), centerPoint, quad[2]);
break;
case BSRight:
quad[0] = outerRect.maxXMinYCorner();
quad[1] = innerRect.maxXMinYCorner();
quad[2] = innerRect.maxXMaxYCorner();
quad[3] = outerRect.maxXMaxYCorner();
if (!innerBorder.radii().topRight().isZero())
findInnerVertex(outerRect.maxXMinYCorner(), innerRect.maxXMinYCorner(), centerPoint, quad[1]);
if (!innerBorder.radii().bottomRight().isZero())
findInnerVertex(outerRect.maxXMaxYCorner(), innerRect.maxXMaxYCorner(), centerPoint, quad[2]);
break;
}
// If the border matches both of its adjacent sides, don't anti-alias the clip, and
// if neither side matches, anti-alias the clip.
if (firstEdgeMatches == secondEdgeMatches) {
graphicsContext->clipConvexPolygon(4, quad, !firstEdgeMatches);
return;
}
// Square off the end which shouldn't be affected by antialiasing, and clip.
FloatPoint firstQuad[4];
firstQuad[0] = quad[0];
firstQuad[1] = quad[1];
firstQuad[2] = side == BSTop || side == BSBottom ? FloatPoint(quad[3].x(), quad[2].y()) : FloatPoint(quad[2].x(), quad[3].y());
firstQuad[3] = quad[3];
graphicsContext->clipConvexPolygon(4, firstQuad, !firstEdgeMatches);
FloatPoint secondQuad[4];
secondQuad[0] = quad[0];
secondQuad[1] = side == BSTop || side == BSBottom ? FloatPoint(quad[0].x(), quad[1].y()) : FloatPoint(quad[1].x(), quad[0].y());
secondQuad[2] = quad[2];
secondQuad[3] = quad[3];
// Antialiasing affects the second side.
graphicsContext->clipConvexPolygon(4, secondQuad, !secondEdgeMatches);
}
static LayoutRect calculateSideRectIncludingInner(const RoundedRect& outerBorder, const BorderEdge edges[], BoxSide side)
{
LayoutRect sideRect = outerBorder.rect();
LayoutUnit width;
switch (side) {
case BSTop:
width = sideRect.height() - edges[BSBottom].widthForPainting();
sideRect.setHeight(width);
break;
case BSBottom:
width = sideRect.height() - edges[BSTop].widthForPainting();
sideRect.shiftYEdgeTo(sideRect.maxY() - width);
break;
case BSLeft:
width = sideRect.width() - edges[BSRight].widthForPainting();
sideRect.setWidth(width);
break;
case BSRight:
width = sideRect.width() - edges[BSLeft].widthForPainting();
sideRect.shiftXEdgeTo(sideRect.maxX() - width);
break;
}
return sideRect;
}
static RoundedRect calculateAdjustedInnerBorder(const RoundedRect&innerBorder, BoxSide side)
{
// Expand the inner border as necessary to make it a rounded rect (i.e. radii contained within each edge).
// This function relies on the fact we only get radii not contained within each edge if one of the radii
// for an edge is zero, so we can shift the arc towards the zero radius corner.
RoundedRect::Radii newRadii = innerBorder.radii();
LayoutRect newRect = innerBorder.rect();
float overshoot;
float maxRadii;
switch (side) {
case BSTop:
overshoot = newRadii.topLeft().width() + newRadii.topRight().width() - newRect.width();
if (overshoot > 0) {
ASSERT(!(newRadii.topLeft().width() && newRadii.topRight().width()));
newRect.setWidth(newRect.width() + overshoot);
if (!newRadii.topLeft().width())
newRect.move(-overshoot, 0);
}
newRadii.setBottomLeft(IntSize(0, 0));
newRadii.setBottomRight(IntSize(0, 0));
maxRadii = std::max(newRadii.topLeft().height(), newRadii.topRight().height());
if (maxRadii > newRect.height())
newRect.setHeight(maxRadii);
break;
case BSBottom:
overshoot = newRadii.bottomLeft().width() + newRadii.bottomRight().width() - newRect.width();
if (overshoot > 0) {
ASSERT(!(newRadii.bottomLeft().width() && newRadii.bottomRight().width()));
newRect.setWidth(newRect.width() + overshoot);
if (!newRadii.bottomLeft().width())
newRect.move(-overshoot, 0);
}
newRadii.setTopLeft(IntSize(0, 0));
newRadii.setTopRight(IntSize(0, 0));
maxRadii = std::max(newRadii.bottomLeft().height(), newRadii.bottomRight().height());
if (maxRadii > newRect.height()) {
newRect.move(0, newRect.height() - maxRadii);
newRect.setHeight(maxRadii);
}
break;
case BSLeft:
overshoot = newRadii.topLeft().height() + newRadii.bottomLeft().height() - newRect.height();
if (overshoot > 0) {
ASSERT(!(newRadii.topLeft().height() && newRadii.bottomLeft().height()));
newRect.setHeight(newRect.height() + overshoot);
if (!newRadii.topLeft().height())
newRect.move(0, -overshoot);
}
newRadii.setTopRight(IntSize(0, 0));
newRadii.setBottomRight(IntSize(0, 0));
maxRadii = std::max(newRadii.topLeft().width(), newRadii.bottomLeft().width());
if (maxRadii > newRect.width())
newRect.setWidth(maxRadii);
break;
case BSRight:
overshoot = newRadii.topRight().height() + newRadii.bottomRight().height() - newRect.height();
if (overshoot > 0) {
ASSERT(!(newRadii.topRight().height() && newRadii.bottomRight().height()));
newRect.setHeight(newRect.height() + overshoot);
if (!newRadii.topRight().height())
newRect.move(0, -overshoot);
}
newRadii.setTopLeft(IntSize(0, 0));
newRadii.setBottomLeft(IntSize(0, 0));
maxRadii = std::max(newRadii.topRight().width(), newRadii.bottomRight().width());
if (maxRadii > newRect.width()) {
newRect.move(newRect.width() - maxRadii, 0);
newRect.setWidth(maxRadii);
}
break;
}
return RoundedRect(newRect, newRadii);
}
void RenderBoxModelObject::clipBorderSideForComplexInnerPath(GraphicsContext* graphicsContext, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
BoxSide side, const class BorderEdge edges[])
{
graphicsContext->clip(calculateSideRectIncludingInner(outerBorder, edges, side));
graphicsContext->clipOutRoundedRect(FloatRoundedRect(calculateAdjustedInnerBorder(innerBorder, side)));
}
bool RenderBoxModelObject::borderObscuresBackgroundEdge(const FloatSize& contextScale) const
{
BorderEdge edges[4];
BorderEdge::getBorderEdgeInfo(edges, style(), document().deviceScaleFactor());
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
// FIXME: for vertical text
float axisScale = (i == BSTop || i == BSBottom) ? contextScale.height() : contextScale.width();
if (!currEdge.obscuresBackgroundEdge(axisScale))
return false;
}
return true;
}
bool RenderBoxModelObject::borderObscuresBackground() const
{
if (!style().hasBorder())
return false;
// Bail if we have any border-image for now. We could look at the image alpha to improve this.
if (style().borderImage().image())
return false;
BorderEdge edges[4];
BorderEdge::getBorderEdgeInfo(edges, style(), document().deviceScaleFactor());
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
if (!currEdge.obscuresBackground())
return false;
}
return true;
}
bool RenderBoxModelObject::boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox* inlineFlowBox) const
{
if (bleedAvoidance != BackgroundBleedNone)
return false;
if (style().hasAppearance())
return false;
bool hasOneNormalBoxShadow = false;
for (const ShadowData* currentShadow = style().boxShadow(); currentShadow; currentShadow = currentShadow->next()) {
if (currentShadow->style() != Normal)
continue;
if (hasOneNormalBoxShadow)
return false;
hasOneNormalBoxShadow = true;
if (currentShadow->spread())
return false;
}
if (!hasOneNormalBoxShadow)
return false;
Color backgroundColor = style().visitedDependentColor(CSSPropertyBackgroundColor);
if (!backgroundColor.isValid() || backgroundColor.hasAlpha())
return false;
const FillLayer* lastBackgroundLayer = style().backgroundLayers();
for (const FillLayer* next = lastBackgroundLayer->next(); next; next = lastBackgroundLayer->next())
lastBackgroundLayer = next;
if (lastBackgroundLayer->clip() != BorderFillBox)
return false;
if (lastBackgroundLayer->image() && style().hasBorderRadius())
return false;
if (inlineFlowBox && !inlineFlowBox->boxShadowCanBeAppliedToBackground(*lastBackgroundLayer))
return false;
if (hasOverflowClip() && lastBackgroundLayer->attachment() == LocalBackgroundAttachment)
return false;
return true;
}
static inline LayoutRect areaCastingShadowInHole(const LayoutRect& holeRect, int shadowExtent, int shadowSpread, const IntSize& shadowOffset)
{
LayoutRect bounds(holeRect);
bounds.inflate(shadowExtent);
if (shadowSpread < 0)
bounds.inflate(-shadowSpread);
LayoutRect offsetBounds = bounds;
offsetBounds.move(-shadowOffset);
return unionRect(bounds, offsetBounds);
}
void RenderBoxModelObject::paintBoxShadow(const PaintInfo& info, const LayoutRect& paintRect, const RenderStyle& style, ShadowStyle shadowStyle, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
// FIXME: Deal with border-image. Would be great to use border-image as a mask.
GraphicsContext* context = info.context;
if (context->paintingDisabled() || !style.boxShadow())
return;
RoundedRect border = (shadowStyle == Inset) ? style.getRoundedInnerBorderFor(paintRect, includeLogicalLeftEdge, includeLogicalRightEdge)
: style.getRoundedBorderFor(paintRect, includeLogicalLeftEdge, includeLogicalRightEdge);
bool hasBorderRadius = style.hasBorderRadius();
bool isHorizontal = style.isHorizontalWritingMode();
float deviceScaleFactor = document().deviceScaleFactor();
bool hasOpaqueBackground = style.visitedDependentColor(CSSPropertyBackgroundColor).isValid() && style.visitedDependentColor(CSSPropertyBackgroundColor).alpha() == 255;
for (const ShadowData* shadow = style.boxShadow(); shadow; shadow = shadow->next()) {
if (shadow->style() != shadowStyle)
continue;
// FIXME: Add subpixel support for the shadow values. Soon after the shadow offset becomes fractional,
// all the early snappings here need to be pushed to the actual painting operations.
IntSize shadowOffset(shadow->x(), shadow->y());
int shadowRadius = shadow->radius();
int shadowPaintingExtent = shadow->paintingExtent();
int shadowSpread = shadow->spread();
if (shadowOffset.isZero() && !shadowRadius && !shadowSpread)
continue;
const Color& shadowColor = shadow->color();
if (shadow->style() == Normal) {
RoundedRect fillRect = border;
fillRect.inflate(shadowSpread);
if (fillRect.isEmpty())
continue;
FloatRect pixelSnappedShadowRect = snapRectToDevicePixels(border.rect(), deviceScaleFactor);
pixelSnappedShadowRect.inflate(shadowPaintingExtent + shadowSpread);
pixelSnappedShadowRect.move(shadowOffset);
GraphicsContextStateSaver stateSaver(*context);
context->clip(pixelSnappedShadowRect);
// Move the fill just outside the clip, adding 1 pixel separation so that the fill does not
// bleed in (due to antialiasing) if the context is transformed.
IntSize extraOffset(roundToInt(paintRect.width()) + std::max(0, shadowOffset.width()) + shadowPaintingExtent + 2 * shadowSpread + 1, 0);
shadowOffset -= extraOffset;
fillRect.move(extraOffset);
if (shadow->isWebkitBoxShadow())
context->setLegacyShadow(shadowOffset, shadowRadius, shadowColor, style.colorSpace());
else
context->setShadow(shadowOffset, shadowRadius, shadowColor, style.colorSpace());
FloatRoundedRect rectToClipOut = border.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
FloatRoundedRect pixelSnappedFillRect = fillRect.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
if (hasBorderRadius) {
// If the box is opaque, it is unnecessary to clip it out. However, doing so saves time
// when painting the shadow. On the other hand, it introduces subpixel gaps along the
// corners. Those are avoided by insetting the clipping path by one pixel.
if (hasOpaqueBackground)
rectToClipOut.inflateWithRadii(LayoutUnit::fromPixel(-1));
if (!rectToClipOut.isEmpty())
context->clipOutRoundedRect(rectToClipOut);
RoundedRect influenceRect(LayoutRect(pixelSnappedShadowRect), border.radii());
influenceRect.expandRadii(2 * shadowPaintingExtent + shadowSpread);
if (allCornersClippedOut(influenceRect, info.rect))
context->fillRect(pixelSnappedFillRect.rect(), Color::black, style.colorSpace());
else {
pixelSnappedFillRect.expandRadii(shadowSpread);
if (!pixelSnappedFillRect.isRenderable())
pixelSnappedFillRect.adjustRadii();
context->fillRoundedRect(pixelSnappedFillRect, Color::black, style.colorSpace());
}
} else {
// If the box is opaque, it is unnecessary to clip it out. However, doing so saves time
// when painting the shadow. On the other hand, it introduces subpixel gaps along the
// edges if they are not pixel-aligned. Those are avoided by insetting the clipping path
// by one pixel.
if (hasOpaqueBackground) {
// FIXME: The function to decide on the policy based on the transform should be a named function.
// FIXME: It's not clear if this check is right. What about integral scale factors?
AffineTransform transform = context->getCTM();
if (transform.a() != 1 || (transform.d() != 1 && transform.d() != -1) || transform.b() || transform.c())
rectToClipOut.inflate(LayoutUnit::fromPixel(-1).toFloat());
}
if (!rectToClipOut.isEmpty())
context->clipOut(rectToClipOut.rect());
context->fillRect(pixelSnappedFillRect.rect(), Color::black, style.colorSpace());
}
} else {
// Inset shadow.
FloatRoundedRect pixelSnappedBorderRect = border.pixelSnappedRoundedRectForPainting(deviceScaleFactor);
FloatRect pixelSnappedHoleRect = pixelSnappedBorderRect.rect();
pixelSnappedHoleRect.inflate(-shadowSpread);
if (pixelSnappedHoleRect.isEmpty()) {
if (hasBorderRadius)
context->fillRoundedRect(pixelSnappedBorderRect, shadowColor, style.colorSpace());
else
context->fillRect(pixelSnappedBorderRect.rect(), shadowColor, style.colorSpace());
continue;
}
if (!includeLogicalLeftEdge) {
if (isHorizontal) {
pixelSnappedHoleRect.move(-std::max(shadowOffset.width(), 0) - shadowPaintingExtent, 0);
pixelSnappedHoleRect.setWidth(pixelSnappedHoleRect.width() + std::max(shadowOffset.width(), 0) + shadowPaintingExtent);
} else {
pixelSnappedHoleRect.move(0, -std::max(shadowOffset.height(), 0) - shadowPaintingExtent);
pixelSnappedHoleRect.setHeight(pixelSnappedHoleRect.height() + std::max(shadowOffset.height(), 0) + shadowPaintingExtent);
}
}
if (!includeLogicalRightEdge) {
if (isHorizontal)
pixelSnappedHoleRect.setWidth(pixelSnappedHoleRect.width() - std::min(shadowOffset.width(), 0) + shadowPaintingExtent);
else
pixelSnappedHoleRect.setHeight(pixelSnappedHoleRect.height() - std::min(shadowOffset.height(), 0) + shadowPaintingExtent);
}
Color fillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), 255);
FloatRect pixelSnappedOuterRect = snapRectToDevicePixels(areaCastingShadowInHole(LayoutRect(pixelSnappedBorderRect.rect()), shadowPaintingExtent, shadowSpread, shadowOffset), deviceScaleFactor);
FloatRoundedRect pixelSnappedRoundedHole = FloatRoundedRect(pixelSnappedHoleRect, pixelSnappedBorderRect.radii());
GraphicsContextStateSaver stateSaver(*context);
if (hasBorderRadius) {
Path path;
path.addRoundedRect(pixelSnappedBorderRect);
context->clip(path);
pixelSnappedRoundedHole.shrinkRadii(shadowSpread);
} else
context->clip(pixelSnappedBorderRect.rect());
IntSize extraOffset(2 * roundToInt(paintRect.width()) + std::max(0, shadowOffset.width()) + shadowPaintingExtent - 2 * shadowSpread + 1, 0);
context->translate(extraOffset.width(), extraOffset.height());
shadowOffset -= extraOffset;
if (shadow->isWebkitBoxShadow())
context->setLegacyShadow(shadowOffset, shadowRadius, shadowColor, style.colorSpace());
else
context->setShadow(shadowOffset, shadowRadius, shadowColor, style.colorSpace());
context->fillRectWithRoundedHole(pixelSnappedOuterRect, pixelSnappedRoundedHole, fillColor, style.colorSpace());
}
}
}
LayoutUnit RenderBoxModelObject::containingBlockLogicalWidthForContent() const
{
return containingBlock()->availableLogicalWidth();
}
RenderBoxModelObject* RenderBoxModelObject::continuation() const
{
if (!hasContinuation())
return nullptr;
return continuationMap().get(this);
}
void RenderBoxModelObject::setContinuation(RenderBoxModelObject* continuation)
{
if (continuation)
continuationMap().set(this, continuation);
else if (hasContinuation())
continuationMap().remove(this);
setHasContinuation(!!continuation);
}
RenderTextFragment* RenderBoxModelObject::firstLetterRemainingText() const
{
if (!firstLetterRemainingTextMap)
return 0;
return firstLetterRemainingTextMap->get(this);
}
void RenderBoxModelObject::setFirstLetterRemainingText(RenderTextFragment* remainingText)
{
if (remainingText) {
if (!firstLetterRemainingTextMap)
firstLetterRemainingTextMap = new FirstLetterRemainingTextMap;
firstLetterRemainingTextMap->set(this, remainingText);
} else if (firstLetterRemainingTextMap)
firstLetterRemainingTextMap->remove(this);
}
LayoutRect RenderBoxModelObject::localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset)
{
ASSERT(!firstChild());
// FIXME: This does not take into account either :first-line or :first-letter
// However, as soon as some content is entered, the line boxes will be
// constructed and this kludge is not called any more. So only the caret size
// of an empty :first-line'd block is wrong. I think we can live with that.
const RenderStyle& currentStyle = firstLineStyle();
LayoutUnit height = lineHeight(true, currentStyle.isHorizontalWritingMode() ? HorizontalLine : VerticalLine);
enum CaretAlignment { alignLeft, alignRight, alignCenter };
CaretAlignment alignment = alignLeft;
switch (currentStyle.textAlign()) {
case LEFT:
case WEBKIT_LEFT:
break;
case CENTER:
case WEBKIT_CENTER:
alignment = alignCenter;
break;
case RIGHT:
case WEBKIT_RIGHT:
alignment = alignRight;
break;
case JUSTIFY:
case TASTART:
if (!currentStyle.isLeftToRightDirection())
alignment = alignRight;
break;
case TAEND:
if (currentStyle.isLeftToRightDirection())
alignment = alignRight;
break;
}
LayoutUnit x = borderLeft() + paddingLeft();
LayoutUnit maxX = width - borderRight() - paddingRight();
switch (alignment) {
case alignLeft:
if (currentStyle.isLeftToRightDirection())
x += textIndentOffset;
break;
case alignCenter:
x = (x + maxX) / 2;
if (currentStyle.isLeftToRightDirection())
x += textIndentOffset / 2;
else
x -= textIndentOffset / 2;
break;
case alignRight:
x = maxX - caretWidth;
if (!currentStyle.isLeftToRightDirection())
x -= textIndentOffset;
break;
}
x = std::min(x, std::max<LayoutUnit>(maxX - caretWidth, 0));
LayoutUnit y = paddingTop() + borderTop();
return currentStyle.isHorizontalWritingMode() ? LayoutRect(x, y, caretWidth, height) : LayoutRect(y, x, height, caretWidth);
}
bool RenderBoxModelObject::shouldAntialiasLines(GraphicsContext* context)
{
// FIXME: We may want to not antialias when scaled by an integral value,
// and we may want to antialias when translated by a non-integral value.
return !context->getCTM().isIdentityOrTranslationOrFlipped();
}
void RenderBoxModelObject::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
{
RenderElement* container = this->container();
if (!container)
return;
// FIXME: This code is wrong for named flow threads since it only works for content in the first region.
// We also don't want to run it for multicolumn flow threads, since we can use our knowledge of column
// geometry to actually get a better result.
// The point inside a box that's inside a region has its coordinates relative to the region,
// not the FlowThread that is its container in the RenderObject tree.
if (is<RenderBox>(*this) && container->isOutOfFlowRenderFlowThread()) {
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (downcast<RenderFlowThread>(*container).getRegionRangeForBox(downcast<RenderBox>(this), startRegion, endRegion))
container = startRegion;
}
container->mapAbsoluteToLocalPoint(mode, transformState);
LayoutSize containerOffset = offsetFromContainer(*container, LayoutPoint());
bool preserve3D = mode & UseTransforms && (container->style().preserves3D() || style().preserves3D());
if (mode & UseTransforms && shouldUseTransformFromContainer(container)) {
TransformationMatrix t;
getTransformFromContainer(container, containerOffset, t);
transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
} else
transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
}
void RenderBoxModelObject::moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, RenderObject* beforeChild, bool fullRemoveInsert)
{
// We assume that callers have cleared their positioned objects list for child moves (!fullRemoveInsert) so the
// positioned renderer maps don't become stale. It would be too slow to do the map lookup on each call.
ASSERT(!fullRemoveInsert || !is<RenderBlock>(*this) || !downcast<RenderBlock>(*this).hasPositionedObjects());
ASSERT(this == child->parent());
ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
if (fullRemoveInsert && (toBoxModelObject->isRenderBlock() || toBoxModelObject->isRenderInline())) {
// Takes care of adding the new child correctly if toBlock and fromBlock
// have different kind of children (block vs inline).
removeChildInternal(*child, NotifyChildren);
toBoxModelObject->addChild(child, beforeChild);
} else {
NotifyChildrenType notifyType = fullRemoveInsert ? NotifyChildren : DontNotifyChildren;
removeChildInternal(*child, notifyType);
toBoxModelObject->insertChildInternal(child, beforeChild, notifyType);
}
}
void RenderBoxModelObject::moveChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* startChild, RenderObject* endChild, RenderObject* beforeChild, bool fullRemoveInsert)
{
// This condition is rarely hit since this function is usually called on
// anonymous blocks which can no longer carry positioned objects (see r120761)
// or when fullRemoveInsert is false.
if (fullRemoveInsert && is<RenderBlock>(*this)) {
downcast<RenderBlock>(*this).removePositionedObjects(nullptr);
if (is<RenderBlockFlow>(*this))
downcast<RenderBlockFlow>(*this).removeFloatingObjects();
}
ASSERT(!beforeChild || toBoxModelObject == beforeChild->parent());
for (RenderObject* child = startChild; child && child != endChild; ) {
// Save our next sibling as moveChildTo will clear it.
RenderObject* nextSibling = child->nextSibling();
// Check to make sure we're not saving the firstLetter as the nextSibling.
// When the |child| object will be moved, its firstLetter will be recreated,
// so saving it now in nextSibling would let us with a destroyed object.
if (is<RenderTextFragment>(*child) && is<RenderText>(nextSibling)) {
RenderObject* firstLetterObj = nullptr;
if (RenderBlock* block = downcast<RenderTextFragment>(*child).blockForAccompanyingFirstLetter()) {
RenderElement* firstLetterContainer = nullptr;
block->getFirstLetter(firstLetterObj, firstLetterContainer, child);
}
// This is the first letter, skip it.
if (firstLetterObj == nextSibling)
nextSibling = nextSibling->nextSibling();
}
moveChildTo(toBoxModelObject, child, beforeChild, fullRemoveInsert);
child = nextSibling;
}
}
} // namespace WebCore