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/*
* Copyright (C) 2023 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 "AbstractLineBuilder.h"
#include "FontCascade.h"
#include "InlineContentBreaker.h"
#include "InlineFormattingContext.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Layout {
AbstractLineBuilder::AbstractLineBuilder(InlineFormattingContext& inlineFormattingContext, const ElementBox& rootBox, HorizontalConstraints rootHorizontalConstraints, const InlineItemList& inlineItemList)
: m_line(inlineFormattingContext)
, m_inlineItemList(inlineItemList.span())
, m_inlineFormattingContext(inlineFormattingContext)
, m_rootBox(rootBox)
, m_rootHorizontalConstraints(rootHorizontalConstraints)
{
}
void AbstractLineBuilder::reset()
{
m_wrapOpportunityList.shrink(0);
m_partialLeadingTextItem = { };
m_previousLine = { };
m_isFirstFormattedLineCandidate = false;
}
std::optional<InlineLayoutUnit> AbstractLineBuilder::overflowWidthAsLeadingForNextLine(const InlineContentBreaker::ContinuousContent::RunList& candidateRuns, const InlineContentBreaker::Result& lineBreakingResult) const
{
auto trailingTextRunIndexAsLeadingCandidate = [&]() -> std::optional<size_t> {
ASSERT(lineBreakingResult.action == InlineContentBreaker::Result::Action::Wrap || lineBreakingResult.action == InlineContentBreaker::Result::Action::Break);
auto trailingRunIndex = [&]() -> std::optional<size_t> {
if (candidateRuns.size() == 1)
return { 0 };
if (lineBreakingResult.action == InlineContentBreaker::Result::Action::Break && lineBreakingResult.partialTrailingContent)
return lineBreakingResult.partialTrailingContent->trailingRunIndex;
return { };
};
auto candidateIndex = trailingRunIndex();
if (!candidateIndex || !candidateRuns[*candidateIndex].inlineItem.isText())
return { };
auto& inlineTextItem = downcast<InlineTextItem>(candidateRuns[*candidateIndex].inlineItem);
// For whitespace content we can only re-use measured width when no position dependent character(s) is present.
return !inlineTextItem.isWhitespace() || inlineTextItem.width().has_value() ? candidateIndex : std::nullopt;
};
auto index = trailingTextRunIndexAsLeadingCandidate();
if (!index)
return { };
auto& overflowingRun = candidateRuns[*index];
auto* inlineTextItem = dynamicDowncast<InlineTextItem>(overflowingRun.inlineItem);
if (!inlineTextItem) {
ASSERT_NOT_REACHED();
return { };
}
if (isFirstFormattedLineCandidate()) {
auto& usedStyle = overflowingRun.style;
auto& style = overflowingRun.inlineItem.style();
if (&usedStyle != &style && !usedStyle.fontCascadeEqual(style)) {
// We may have the incorrect text width when styles differ. Just re-measure the text content when we place it on the next line.
return { };
}
}
auto logicalWidthForNextLineAsLeading = overflowingRun.contentWidth();
if (lineBreakingResult.action == InlineContentBreaker::Result::Action::Wrap)
return logicalWidthForNextLineAsLeading;
if (lineBreakingResult.action == InlineContentBreaker::Result::Action::Break && lineBreakingResult.partialTrailingContent->partialRun)
return logicalWidthForNextLineAsLeading - lineBreakingResult.partialTrailingContent->partialRun->logicalWidth;
return { };
}
void AbstractLineBuilder::setIntrinsicWidthMode(IntrinsicWidthMode intrinsicWidthMode)
{
m_intrinsicWidthMode = intrinsicWidthMode;
m_inlineContentBreaker.setIsMinimumInIntrinsicWidthMode(m_intrinsicWidthMode == IntrinsicWidthMode::Minimum);
}
const RenderStyle& AbstractLineBuilder::rootStyle() const
{
return isFirstFormattedLineCandidate() ? root().firstLineStyle() : root().style();
}
const InlineLayoutState& AbstractLineBuilder::layoutState() const
{
return formattingContext().layoutState();
}
InlineLayoutState& AbstractLineBuilder::layoutState()
{
return formattingContext().layoutState();
}
}
}
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