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InlineFormattingContext.cpp
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InlineFormattingContext.cpp
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/*
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "InlineFormattingContext.h"
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "FloatingContext.h"
#include "FontCascade.h"
#include "InlineFormattingState.h"
#include "InlineLineBox.h"
#include "InlineLineRun.h"
#include "InlineTextItem.h"
#include "InvalidationState.h"
#include "LayoutBox.h"
#include "LayoutContainerBox.h"
#include "LayoutContext.h"
#include "LayoutInitialContainingBlock.h"
#include "LayoutInlineTextBox.h"
#include "LayoutLineBreakBox.h"
#include "LayoutReplacedBox.h"
#include "LayoutState.h"
#include "Logging.h"
#include "RuntimeEnabledFeatures.h"
#include "TextUtil.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(InlineFormattingContext);
InlineFormattingContext::InlineFormattingContext(const ContainerBox& formattingContextRoot, InlineFormattingState& formattingState)
: FormattingContext(formattingContextRoot, formattingState)
, m_inlineFormattingGeometry(*this)
, m_inlineFormattingQuirks(*this)
{
}
static inline const Box* nextInlineLevelBoxToLayout(const Box& layoutBox, const ContainerBox& stayWithin)
{
// Atomic inline-level boxes and floats are opaque boxes meaning that they are
// responsible for their own content (do not need to descend into their subtrees).
// Only inline boxes may have relevant descendant content.
if (layoutBox.isInlineBox()) {
if (is<ContainerBox>(layoutBox) && downcast<ContainerBox>(layoutBox).hasInFlowOrFloatingChild()) {
// Anonymous inline text boxes/line breaks can't have descendant content by definition.
ASSERT(!layoutBox.isInlineTextBox() && !layoutBox.isLineBreakBox());
return downcast<ContainerBox>(layoutBox).firstInFlowOrFloatingChild();
}
}
for (auto* nextInPreOrder = &layoutBox; nextInPreOrder && nextInPreOrder != &stayWithin; nextInPreOrder = &nextInPreOrder->parent()) {
if (auto* nextSibling = nextInPreOrder->nextInFlowOrFloatingSibling())
return nextSibling;
}
return nullptr;
}
void InlineFormattingContext::layoutInFlowContent(InvalidationState& invalidationState, const ConstraintsForInFlowContent& constraints)
{
LOG_WITH_STREAM(FormattingContextLayout, stream << "[Start] -> inline formatting context -> formatting root(" << &root() << ")");
ASSERT(root().hasInFlowOrFloatingChild());
invalidateFormattingState(invalidationState);
auto* layoutBox = root().firstInFlowOrFloatingChild();
// 1. Visit each inline box and partially compute their geometry (margins, padding and borders).
// 2. Collect the inline items (flatten the the layout tree) and place them on lines in bidirectional order.
while (layoutBox) {
ASSERT(layoutBox->isInlineLevelBox() || layoutBox->isFloatingPositioned());
if (layoutBox->isAtomicInlineLevelBox() || layoutBox->isFloatingPositioned()) {
// Inline-blocks, inline-tables and replaced elements (img, video) can be sized but not yet positioned.
if (is<ContainerBox>(layoutBox) && layoutBox->establishesFormattingContext()) {
ASSERT(layoutBox->isInlineBlockBox() || layoutBox->isInlineTableBox() || layoutBox->isFloatingPositioned());
auto& formattingRoot = downcast<ContainerBox>(*layoutBox);
computeBorderAndPadding(formattingRoot, constraints.horizontal());
computeWidthAndMargin(formattingRoot, constraints.horizontal());
if (formattingRoot.hasChild()) {
auto formattingContext = LayoutContext::createFormattingContext(formattingRoot, layoutState());
if (formattingRoot.hasInFlowOrFloatingChild())
formattingContext->layoutInFlowContent(invalidationState, formattingGeometry().constraintsForInFlowContent(formattingRoot));
computeHeightAndMargin(formattingRoot, constraints.horizontal());
formattingContext->layoutOutOfFlowContent(invalidationState, formattingGeometry().constraintsForOutOfFlowContent(formattingRoot));
} else
computeHeightAndMargin(formattingRoot, constraints.horizontal());
} else {
// Replaced and other type of leaf atomic inline boxes.
computeBorderAndPadding(*layoutBox, constraints.horizontal());
computeWidthAndMargin(*layoutBox, constraints.horizontal());
computeHeightAndMargin(*layoutBox, constraints.horizontal());
}
} else if (layoutBox->isLineBreakBox()) {
auto& boxGeometry = formattingState().boxGeometry(*layoutBox);
boxGeometry.setHorizontalMargin({ });
boxGeometry.setBorder({ });
boxGeometry.setPadding({ });
boxGeometry.setContentBoxWidth({ });
boxGeometry.setVerticalMargin({ });
} else if (layoutBox->isInlineBox()) {
// Text wrapper boxes (anonymous inline level boxes) don't have box geometries (they only generate runs).
if (!layoutBox->isInlineTextBox()) {
// Inline boxes (<span>) can't get sized/positioned yet. At this point we can only compute their margins, borders and padding.
computeBorderAndPadding(*layoutBox, constraints.horizontal());
computeHorizontalMargin(*layoutBox, constraints.horizontal());
formattingState().boxGeometry(*layoutBox).setVerticalMargin({ });
}
} else
ASSERT_NOT_REACHED();
layoutBox = nextInlineLevelBoxToLayout(*layoutBox, root());
}
collectInlineContentIfNeeded();
auto& inlineItems = formattingState().inlineItems();
lineLayout(inlineItems, { 0, inlineItems.size() }, constraints);
LOG_WITH_STREAM(FormattingContextLayout, stream << "[End] -> inline formatting context -> formatting root(" << &root() << ")");
}
void InlineFormattingContext::lineLayoutForIntergration(InvalidationState& invalidationState, const ConstraintsForInFlowContent& constraints)
{
invalidateFormattingState(invalidationState);
collectInlineContentIfNeeded();
auto& inlineItems = formattingState().inlineItems();
lineLayout(inlineItems, { 0, inlineItems.size() }, constraints);
}
LayoutUnit InlineFormattingContext::usedContentHeight() const
{
// 10.6.7 'Auto' heights for block formatting context roots
// If it only has inline-level children, the height is the distance between the top of the topmost line box and the bottom of the bottommost line box.
// In addition, if the element has any floating descendants whose bottom margin edge is below the element's bottom content edge,
// then the height is increased to include those edges. Only floats that participate in this block formatting context are taken
// into account, e.g., floats inside absolutely positioned descendants or other floats are not.
auto& lines = formattingState().lines();
// Even empty content generates a line.
ASSERT(!lines.isEmpty());
auto top = LayoutUnit { lines.first().lineBoxLogicalRect().top() };
auto bottom = LayoutUnit { lines.last().lineBoxLogicalRect().bottom() + formattingState().clearGapAfterLastLine() };
auto floatingContext = FloatingContext { *this, formattingState().floatingState() };
if (auto floatBottom = floatingContext.bottom()) {
bottom = std::max(*floatBottom, bottom);
top = std::min(*floatingContext.top(), top);
}
return bottom - top;
}
void InlineFormattingContext::lineLayout(InlineItems& inlineItems, LineBuilder::InlineItemRange needsLayoutRange, const ConstraintsForInFlowContent& constraints)
{
auto& formattingState = this->formattingState();
formattingState.lineRuns().reserveInitialCapacity(formattingState.inlineItems().size());
InlineLayoutUnit lineLogicalTop = constraints.logicalTop();
struct PreviousLine {
LineBuilder::InlineItemRange range;
size_t overflowContentLength { 0 };
std::optional<InlineLayoutUnit> overflowLogicalWidth;
};
std::optional<PreviousLine> previousLine;
auto& floatingState = formattingState.floatingState();
auto floatingContext = FloatingContext { *this, floatingState };
auto isFirstLine = formattingState.lines().isEmpty();
auto lineBuilder = LineBuilder { *this, floatingState, constraints.horizontal(), inlineItems };
while (!needsLayoutRange.isEmpty()) {
// Turn previous line's overflow content length into the next line's leading content partial length.
// "sp[<-line break->]lit_content" -> overflow length: 11 -> leading partial content length: 11.
auto partialLeadingContentLength = previousLine ? previousLine->overflowContentLength : 0;
auto leadingLogicalWidth = previousLine ? previousLine->overflowLogicalWidth : std::nullopt;
auto initialLineHeight = [&]() -> InlineLayoutUnit {
if (layoutState().inStandardsMode())
return root().style().computedLineHeight();
return formattingQuirks().initialLineHeight();
}();
auto initialLineConstraints = InlineRect { lineLogicalTop, constraints.horizontal().logicalLeft, constraints.horizontal().logicalWidth, initialLineHeight };
auto lineContent = lineBuilder.layoutInlineContent(needsLayoutRange, partialLeadingContentLength, leadingLogicalWidth, initialLineConstraints, isFirstLine);
auto lineLogicalRect = computeGeometryForLineContent(lineContent, constraints.horizontal());
auto lineContentRange = lineContent.inlineItemRange;
if (!lineContentRange.isEmpty()) {
ASSERT(needsLayoutRange.start < lineContentRange.end);
isFirstLine = false;
lineLogicalTop = formattingGeometry().logicalTopForNextLine(lineContent, lineLogicalRect.bottom(), floatingContext);
if (lineContent.isLastLineWithInlineContent) {
// The final content height of this inline formatting context should include the cleared floats as well.
formattingState.setClearGapAfterLastLine(lineLogicalTop - lineLogicalRect.bottom());
}
// When the trailing content is partial, we need to reuse the last InlineTextItem.
auto lastInlineItemNeedsPartialLayout = lineContent.partialTrailingContentLength;
if (lastInlineItemNeedsPartialLayout) {
auto lineLayoutHasAdvanced = !previousLine
|| lineContentRange.end > previousLine->range.end
|| (previousLine->overflowContentLength && previousLine->overflowContentLength > lineContent.partialTrailingContentLength);
if (!lineLayoutHasAdvanced) {
ASSERT_NOT_REACHED();
// Move over to the next run if we are stuck on this partial content (when the overflow content length remains the same).
// We certainly lose some content, but we would be busy looping otherwise.
lastInlineItemNeedsPartialLayout = false;
}
}
needsLayoutRange.start = lastInlineItemNeedsPartialLayout ? lineContentRange.end - 1 : lineContentRange.end;
previousLine = PreviousLine { lineContentRange, lineContent.partialTrailingContentLength, lineContent.overflowLogicalWidth };
continue;
}
// Floats prevented us placing any content on the line.
ASSERT(lineContent.runs.isEmpty());
ASSERT(lineContent.hasIntrusiveFloat);
// Move the next line below the intrusive float(s).
auto logicalTopCandidateForNextLine = [&] {
auto lineBottomWithNoInlineContent = LayoutUnit { std::max(lineLogicalRect.bottom(), initialLineConstraints.bottom()) };
auto floatConstraints = floatingContext.constraints(toLayoutUnit(lineLogicalTop), lineBottomWithNoInlineContent);
ASSERT(floatConstraints.left || floatConstraints.right);
if (floatConstraints.left && floatConstraints.right) {
// In case of left and right constraints, we need to pick the one that's closer to the current line.
return std::min(floatConstraints.left->y, floatConstraints.right->y);
}
if (floatConstraints.left)
return floatConstraints.left->y;
if (floatConstraints.right)
return floatConstraints.right->y;
ASSERT_NOT_REACHED();
return lineBottomWithNoInlineContent;
};
lineLogicalTop = logicalTopCandidateForNextLine();
}
}
IntrinsicWidthConstraints InlineFormattingContext::computedIntrinsicWidthConstraints()
{
auto& layoutState = this->layoutState();
ASSERT(!formattingState().intrinsicWidthConstraints());
if (!root().hasInFlowOrFloatingChild()) {
auto constraints = formattingGeometry().constrainByMinMaxWidth(root(), { });
formattingState().setIntrinsicWidthConstraints(constraints);
return constraints;
}
Vector<const Box*> formattingContextRootList;
auto horizontalConstraints = HorizontalConstraints { 0_lu, 0_lu };
auto* layoutBox = root().firstInFlowOrFloatingChild();
// In order to compute the max/min widths, we need to compute margins, borders and padding for certain inline boxes first.
while (layoutBox) {
if (layoutBox->isInlineTextBox()) {
layoutBox = nextInlineLevelBoxToLayout(*layoutBox, root());
continue;
}
if (layoutBox->isReplacedBox()) {
computeBorderAndPadding(*layoutBox, horizontalConstraints);
computeWidthAndMargin(*layoutBox, horizontalConstraints);
} else if (layoutBox->isFloatingPositioned() || layoutBox->isAtomicInlineLevelBox()) {
ASSERT(layoutBox->establishesFormattingContext());
formattingContextRootList.append(layoutBox);
computeBorderAndPadding(*layoutBox, horizontalConstraints);
computeHorizontalMargin(*layoutBox, horizontalConstraints);
computeIntrinsicWidthForFormattingRoot(*layoutBox);
} else if (layoutBox->isInlineBox()) {
computeBorderAndPadding(*layoutBox, horizontalConstraints);
computeHorizontalMargin(*layoutBox, horizontalConstraints);
} else
ASSERT_NOT_REACHED();
layoutBox = nextInlineLevelBoxToLayout(*layoutBox, root());
}
collectInlineContentIfNeeded();
auto maximumLineWidth = [&](auto availableWidth) {
// Switch to the min/max formatting root width values before formatting the lines.
for (auto* formattingRoot : formattingContextRootList) {
auto intrinsicWidths = layoutState.formattingStateForBox(*formattingRoot).intrinsicWidthConstraintsForBox(*formattingRoot);
auto& boxGeometry = formattingState().boxGeometry(*formattingRoot);
auto contentWidth = (availableWidth ? intrinsicWidths->maximum : intrinsicWidths->minimum) - boxGeometry.horizontalMarginBorderAndPadding();
boxGeometry.setContentBoxWidth(contentWidth);
}
return computedIntrinsicWidthForConstraint(availableWidth);
};
auto minimumContentWidth = ceiledLayoutUnit(maximumLineWidth(0));
auto maximumContentWidth = ceiledLayoutUnit(maximumLineWidth(maxInlineLayoutUnit()));
auto constraints = formattingGeometry().constrainByMinMaxWidth(root(), { minimumContentWidth, maximumContentWidth });
formattingState().setIntrinsicWidthConstraints(constraints);
return constraints;
}
InlineLayoutUnit InlineFormattingContext::computedIntrinsicWidthForConstraint(InlineLayoutUnit availableWidth) const
{
auto& inlineItems = formattingState().inlineItems();
auto lineBuilder = LineBuilder { *this, inlineItems };
auto layoutRange = LineBuilder::InlineItemRange { 0 , inlineItems.size() };
auto maximumLineWidth = InlineLayoutUnit { };
auto maximumFloatWidth = LayoutUnit { };
while (!layoutRange.isEmpty()) {
auto intrinsicContent = lineBuilder.computedIntrinsicWidth(layoutRange, availableWidth);
layoutRange.start = intrinsicContent.inlineItemRange.end;
maximumLineWidth = std::max(maximumLineWidth, intrinsicContent.logicalWidth);
// FIXME: Add support for clear.
for (auto* floatBox : intrinsicContent.floats)
maximumFloatWidth += geometryForBox(*floatBox).marginBoxWidth();
}
return maximumLineWidth + maximumFloatWidth;
}
void InlineFormattingContext::computeIntrinsicWidthForFormattingRoot(const Box& formattingRoot)
{
ASSERT(formattingRoot.establishesFormattingContext());
auto constraints = IntrinsicWidthConstraints { };
if (auto fixedWidth = formattingGeometry().fixedValue(formattingRoot.style().logicalWidth()))
constraints = { *fixedWidth, *fixedWidth };
else {
auto hasInflowOrFloatingContent = is<ContainerBox>(formattingRoot) && downcast<ContainerBox>(formattingRoot).hasInFlowOrFloatingChild();
// The intrinsic sizes of the size containment box are determined as if the element had no content.
auto shouldIgnoreChildContent = formattingRoot.isSizeContainmentBox();
if (hasInflowOrFloatingContent && !shouldIgnoreChildContent)
constraints = LayoutContext::createFormattingContext(downcast<ContainerBox>(formattingRoot), layoutState())->computedIntrinsicWidthConstraints();
}
constraints = formattingGeometry().constrainByMinMaxWidth(formattingRoot, constraints);
constraints.expand(geometryForBox(formattingRoot).horizontalMarginBorderAndPadding());
formattingState().setIntrinsicWidthConstraintsForBox(formattingRoot, constraints);
}
void InlineFormattingContext::computeHorizontalMargin(const Box& layoutBox, const HorizontalConstraints& horizontalConstraints)
{
auto computedHorizontalMargin = formattingGeometry().computedHorizontalMargin(layoutBox, horizontalConstraints);
formattingState().boxGeometry(layoutBox).setHorizontalMargin({ computedHorizontalMargin.start.value_or(0), computedHorizontalMargin.end.value_or(0) });
}
void InlineFormattingContext::computeWidthAndMargin(const Box& layoutBox, const HorizontalConstraints& horizontalConstraints)
{
auto compute = [&](std::optional<LayoutUnit> usedWidth) {
if (layoutBox.isFloatingPositioned())
return formattingGeometry().floatingContentWidthAndMargin(layoutBox, horizontalConstraints, { usedWidth, { } });
if (layoutBox.isInlineBlockBox())
return formattingGeometry().inlineBlockContentWidthAndMargin(layoutBox, horizontalConstraints, { usedWidth, { } });
if (layoutBox.isReplacedBox())
return formattingGeometry().inlineReplacedContentWidthAndMargin(downcast<ReplacedBox>(layoutBox), horizontalConstraints, { }, { usedWidth, { } });
ASSERT_NOT_REACHED();
return ContentWidthAndMargin { };
};
auto contentWidthAndMargin = compute({ });
auto availableWidth = horizontalConstraints.logicalWidth;
if (auto maxWidth = formattingGeometry().computedMaxWidth(layoutBox, availableWidth)) {
auto maxWidthAndMargin = compute(maxWidth);
if (contentWidthAndMargin.contentWidth > maxWidthAndMargin.contentWidth)
contentWidthAndMargin = maxWidthAndMargin;
}
auto minWidth = formattingGeometry().computedMinWidth(layoutBox, availableWidth).value_or(0);
auto minWidthAndMargin = compute(minWidth);
if (contentWidthAndMargin.contentWidth < minWidthAndMargin.contentWidth)
contentWidthAndMargin = minWidthAndMargin;
auto& boxGeometry = formattingState().boxGeometry(layoutBox);
boxGeometry.setContentBoxWidth(contentWidthAndMargin.contentWidth);
boxGeometry.setHorizontalMargin({ contentWidthAndMargin.usedMargin.start, contentWidthAndMargin.usedMargin.end });
}
void InlineFormattingContext::computeHeightAndMargin(const Box& layoutBox, const HorizontalConstraints& horizontalConstraints)
{
auto compute = [&](std::optional<LayoutUnit> usedHeight) {
if (layoutBox.isFloatingPositioned())
return formattingGeometry().floatingContentHeightAndMargin(layoutBox, horizontalConstraints, { usedHeight });
if (layoutBox.isInlineBlockBox())
return formattingGeometry().inlineBlockContentHeightAndMargin(layoutBox, horizontalConstraints, { usedHeight });
if (layoutBox.isReplacedBox())
return formattingGeometry().inlineReplacedContentHeightAndMargin(downcast<ReplacedBox>(layoutBox), horizontalConstraints, { }, { usedHeight });
ASSERT_NOT_REACHED();
return ContentHeightAndMargin { };
};
auto contentHeightAndMargin = compute({ });
if (auto maxHeight = formattingGeometry().computedMaxHeight(layoutBox)) {
auto maxHeightAndMargin = compute(maxHeight);
if (contentHeightAndMargin.contentHeight > maxHeightAndMargin.contentHeight)
contentHeightAndMargin = maxHeightAndMargin;
}
if (auto minHeight = formattingGeometry().computedMinHeight(layoutBox)) {
auto minHeightAndMargin = compute(minHeight);
if (contentHeightAndMargin.contentHeight < minHeightAndMargin.contentHeight)
contentHeightAndMargin = minHeightAndMargin;
}
auto& boxGeometry = formattingState().boxGeometry(layoutBox);
boxGeometry.setContentBoxHeight(contentHeightAndMargin.contentHeight);
boxGeometry.setVerticalMargin({ contentHeightAndMargin.nonCollapsedMargin.before, contentHeightAndMargin.nonCollapsedMargin.after });
}
void InlineFormattingContext::collectInlineContentIfNeeded()
{
auto& formattingState = this->formattingState();
if (!formattingState.inlineItems().isEmpty())
return;
// Traverse the tree and create inline items out of inline boxes and leaf nodes. This essentially turns the tree inline structure into a flat one.
// <span>text<span></span><img></span> -> [InlineBoxStart][InlineLevelBox][InlineBoxStart][InlineBoxEnd][InlineLevelBox][InlineBoxEnd]
ASSERT(root().hasInFlowOrFloatingChild());
LayoutQueue layoutQueue;
layoutQueue.append(root().firstInFlowOrFloatingChild());
while (!layoutQueue.isEmpty()) {
while (true) {
auto& layoutBox = *layoutQueue.last();
auto isBoxWithInlineContent = layoutBox.isInlineBox() && !layoutBox.isInlineTextBox() && !layoutBox.isLineBreakBox();
if (!isBoxWithInlineContent)
break;
// This is the start of an inline box (e.g. <span>).
formattingState.addInlineItem({ layoutBox, InlineItem::Type::InlineBoxStart });
auto& inlineBoxWithInlineContent = downcast<ContainerBox>(layoutBox);
if (!inlineBoxWithInlineContent.hasInFlowOrFloatingChild())
break;
layoutQueue.append(inlineBoxWithInlineContent.firstInFlowOrFloatingChild());
}
while (!layoutQueue.isEmpty()) {
auto& layoutBox = *layoutQueue.takeLast();
if (is<LineBreakBox>(layoutBox)) {
auto& lineBreakBox = downcast<LineBreakBox>(layoutBox);
formattingState.addInlineItem({ layoutBox, lineBreakBox.isOptional() ? InlineItem::Type::WordBreakOpportunity : InlineItem::Type::HardLineBreak });
} else if (layoutBox.isFloatingPositioned())
formattingState.addInlineItem({ layoutBox, InlineItem::Type::Float });
else if (layoutBox.isAtomicInlineLevelBox())
formattingState.addInlineItem({ layoutBox, InlineItem::Type::Box });
else if (layoutBox.isInlineTextBox()) {
InlineTextItem::createAndAppendTextItems(formattingState.inlineItems(), downcast<InlineTextBox>(layoutBox));
} else if (layoutBox.isInlineBox())
formattingState.addInlineItem({ layoutBox, InlineItem::Type::InlineBoxEnd });
else
ASSERT_NOT_REACHED();
if (auto* nextSibling = layoutBox.nextInFlowOrFloatingSibling()) {
layoutQueue.append(nextSibling);
break;
}
}
}
}
InlineRect InlineFormattingContext::computeGeometryForLineContent(const LineBuilder::LineContent& lineContent, const HorizontalConstraints& horizontalConstraints)
{
auto& formattingState = this->formattingState();
auto& formattingGeometry = this->formattingGeometry();
auto lineIndex = formattingState.lines().size();
auto lineBoxAndGeometry = formattingGeometry.lineBoxForLineContent(lineContent);
formattingState.addLineBox(WTFMove(lineBoxAndGeometry.lineBox));
formattingState.addLine(lineBoxAndGeometry.lineGeometry);
const auto& lineBox = formattingState.lineBoxes().last();
auto lineBoxLogicalRect = lineBoxAndGeometry.lineGeometry.lineBoxLogicalRect();
if (!lineBox.hasContent()) {
// Fast path for lines with no content e.g. <div><span></span><span></span></div> or <span><div></div></span> where we construct empty pre and post blocks.
ASSERT(!lineBox.rootInlineBox().hasContent() && !lineBoxLogicalRect.height());
auto updateInlineBoxesGeometryIfApplicable = [&] {
if (!lineBox.hasInlineBox())
return;
Vector<const Box*> layoutBoxList;
// Collect the empty inline boxes that showed up first on this line.
// Note that an inline box end on an empty line does not make the inline box taller.
// (e.g. <div>text<span><br></span></div>) <- the <span> inline box is as tall as the line even though the </span> is after a <br> so technically is on the following (empty)line.
for (auto& lineRun : lineContent.runs) {
if (lineRun.isInlineBoxStart())
layoutBoxList.append(&lineRun.layoutBox());
}
for (auto* layoutBox : layoutBoxList) {
auto& boxGeometry = formattingState.boxGeometry(*layoutBox);
auto inlineBoxLogicalHeight = LayoutUnit::fromFloatCeil(lineBox.logicalBorderBoxForInlineBox(*layoutBox, boxGeometry).height());
boxGeometry.setContentBoxHeight(inlineBoxLogicalHeight);
boxGeometry.setContentBoxWidth({ });
boxGeometry.setLogicalTopLeft(toLayoutPoint(lineBoxLogicalRect.topLeft()));
}
};
updateInlineBoxesGeometryIfApplicable();
return lineBoxLogicalRect;
}
HashSet<const Box*> inlineBoxStartSet;
auto constructLineRunsAndUpdateBoxGeometry = [&] {
// Create the inline runs on the current line. This is mostly text and atomic inline runs.
for (auto& lineRun : lineContent.runs) {
// FIXME: We should not need to construct a line run for <br>.
auto& layoutBox = lineRun.layoutBox();
if (lineRun.isText()) {
formattingState.addLineRun({ lineIndex, layoutBox, lineBox.logicalRectForTextRun(lineRun), lineRun.expansion(), lineRun.textContent() });
continue;
}
if (lineRun.isLineBreak()) {
if (layoutBox.isLineBreakBox()) {
// Only hard linebreaks have associated layout boxes.
auto lineBreakBoxRect = lineBox.logicalRectForLineBreakBox(layoutBox);
formattingState.addLineRun({ lineIndex, layoutBox, lineBreakBoxRect, lineRun.expansion(), { } });
auto& boxGeometry = formattingState.boxGeometry(layoutBox);
lineBreakBoxRect.moveBy(lineBoxLogicalRect.topLeft());
boxGeometry.setLogicalTopLeft(toLayoutPoint(lineBreakBoxRect.topLeft()));
boxGeometry.setContentBoxHeight(toLayoutUnit(lineBreakBoxRect.height()));
} else
formattingState.addLineRun({ lineIndex, layoutBox, lineBox.logicalRectForTextRun(lineRun), lineRun.expansion(), lineRun.textContent() });
continue;
}
if (lineRun.isBox()) {
ASSERT(layoutBox.isAtomicInlineLevelBox());
auto& boxGeometry = formattingState.boxGeometry(layoutBox);
auto logicalBorderBox = lineBox.logicalBorderBoxForAtomicInlineLevelBox(layoutBox, boxGeometry);
formattingState.addLineRun({ lineIndex, layoutBox, logicalBorderBox, lineRun.expansion(), { } });
auto borderBoxLogicalTopLeft = logicalBorderBox.topLeft();
// Note that inline boxes are relative to the line and their top position can be negative.
borderBoxLogicalTopLeft.moveBy(lineBoxLogicalRect.topLeft());
if (layoutBox.isInFlowPositioned())
borderBoxLogicalTopLeft += formattingGeometry.inFlowPositionedPositionOffset(layoutBox, horizontalConstraints);
// Atomic inline boxes are all set. Their margin/border/content box geometries are already computed. We just have to position them here.
boxGeometry.setLogicalTopLeft(toLayoutPoint(borderBoxLogicalTopLeft));
continue;
}
if (lineRun.isInlineBoxStart()) {
auto& boxGeometry = formattingState.boxGeometry(layoutBox);
auto inlineBoxLogicalRect = lineBox.logicalBorderBoxForInlineBox(layoutBox, boxGeometry);
formattingState.addLineRun({ lineIndex, layoutBox, inlineBoxLogicalRect, lineRun.expansion(), { } });
inlineBoxStartSet.add(&layoutBox);
continue;
}
ASSERT(lineRun.isInlineBoxEnd() || lineRun.isWordBreakOpportunity());
}
};
constructLineRunsAndUpdateBoxGeometry();
auto updateBoxGeometryForInlineBoxes = [&] {
// FIXME: We may want to keep around an inline box only set.
if (!lineBox.hasInlineBox())
return;
// Grab the inline boxes (even those that don't have associated layout boxes on the current line due to line wrapping)
// and update their geometries.
for (auto& inlineLevelBox : lineBox.nonRootInlineLevelBoxes()) {
if (!inlineLevelBox.isInlineBox())
continue;
auto& layoutBox = inlineLevelBox.layoutBox();
auto& boxGeometry = formattingState.boxGeometry(layoutBox);
// Inline boxes may or may not be wrapped and have runs on multiple lines (e.g. <span>first line<br>second line<br>third line</span>)
auto inlineBoxBorderBox = lineBox.logicalBorderBoxForInlineBox(layoutBox, boxGeometry);
auto inlineBoxSize = LayoutSize { LayoutUnit::fromFloatCeil(inlineBoxBorderBox.width()), LayoutUnit::fromFloatCeil(inlineBoxBorderBox.height()) };
auto logicalRect = Rect { LayoutPoint { inlineBoxBorderBox.topLeft() }, inlineBoxSize };
logicalRect.moveBy(LayoutPoint { lineBoxLogicalRect.topLeft() });
if (inlineBoxStartSet.contains(&layoutBox)) {
// This inline box showed up first on this line.
boxGeometry.setLogicalTopLeft(logicalRect.topLeft());
auto contentBoxHeight = logicalRect.height() - (boxGeometry.verticalBorder() + boxGeometry.verticalPadding().value_or(0_lu));
boxGeometry.setContentBoxHeight(contentBoxHeight);
auto contentBoxWidth = logicalRect.width() - (boxGeometry.horizontalBorder() + boxGeometry.horizontalPadding().value_or(0_lu));
boxGeometry.setContentBoxWidth(contentBoxWidth);
continue;
}
// Middle or end of the inline box. Let's stretch the box as needed.
auto enclosingBorderBoxRect = BoxGeometry::borderBoxRect(boxGeometry);
enclosingBorderBoxRect.expandToContain(logicalRect);
boxGeometry.setLogicalLeft(enclosingBorderBoxRect.left());
boxGeometry.setContentBoxHeight(enclosingBorderBoxRect.height() - (boxGeometry.verticalBorder() + boxGeometry.verticalPadding().value_or(0_lu)));
boxGeometry.setContentBoxWidth(enclosingBorderBoxRect.width() - (boxGeometry.horizontalBorder() + boxGeometry.horizontalPadding().value_or(0_lu)));
}
};
updateBoxGeometryForInlineBoxes();
return lineBoxLogicalRect;
}
void InlineFormattingContext::invalidateFormattingState(const InvalidationState&)
{
// Find out what we need to invalidate. This is where we add some smarts to do partial line layout.
// For now let's just clear the runs.
formattingState().clearLineAndRuns();
// FIXME: This is also where we would delete inline items if their content changed.
}
}
}
#endif