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/*
* Copyright (C) 2024 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 "RangeBasedLineBuilder.h"
#include "InlineFormattingContext.h"
namespace WebCore {
namespace Layout {
static inline bool hasInlineBoxesOnly(size_t inlineBoxCount, size_t numberOfInlineItems)
{
return !(numberOfInlineItems % 2) && inlineBoxCount == numberOfInlineItems / 2;
}
RangeBasedLineBuilder::RangeBasedLineBuilder(InlineFormattingContext& inlineFormattingContext, HorizontalConstraints rootHorizontalConstraints, const InlineContentCache::InlineItems& inlineItems)
: AbstractLineBuilder(inlineFormattingContext, inlineFormattingContext.root(), rootHorizontalConstraints, inlineItems.content())
, m_textOnlySimpleLineBuilder(inlineFormattingContext, downcast<ElementBox>(inlineItems.content()[0].layoutBox()), rootHorizontalConstraints, inlineItems.content())
, m_inlineBoxCount(inlineItems.inlineBoxCount())
{
ASSERT(m_inlineBoxCount);
}
LineLayoutResult RangeBasedLineBuilder::layoutInlineContent(const LineInput& lineInput, const std::optional<PreviousLine>& previousLine)
{
auto numberOfInlineItems = m_inlineItemList.size();
if (hasInlineBoxesOnly(m_inlineBoxCount, numberOfInlineItems)) {
Line::RunList inlineBoxRuns;
inlineBoxRuns.reserveCapacity(numberOfInlineItems);
for (auto& inlineItem : m_inlineItemList) {
ASSERT(inlineItem.isInlineBoxStartOrEnd());
inlineBoxRuns.append({ Line::Run(inlineItem, inlineItem.firstLineStyle(), { }) });
}
auto lineRect = lineInput.initialLogicalRect;
auto contentLeft = InlineFormattingUtils::horizontalAlignmentOffset(rootStyle(), { }, lineRect.width(), { }, inlineBoxRuns, true);
return LineLayoutResult { lineInput.needsLayoutRange
, WTFMove(inlineBoxRuns)
, { }
, { contentLeft, { }, contentLeft, std::max(0.f, contentLeft - lineRect.right()) }
, { lineRect.topLeft(), lineRect.width(), lineRect.left() }
, { }
, { }
, { }
, { }
, { }
, m_inlineBoxCount
};
}
// 1. Shrink the layout range that we can run text-only builder on (currently it's just the opening/closing inline box)
// 2. Run text-only line builder
// 3. Insert/append the missing inline box run
auto isFirstLine = !lineInput.needsLayoutRange.startIndex();
auto adjustedNeedsLayoutRange = [&] {
auto needsLayoutRange = lineInput.needsLayoutRange;
if (isFirstLine) {
ASSERT(m_inlineItemList.front().isInlineBoxStart());
ASSERT(!needsLayoutRange.start.offset);
// Skip leading InlineItemStart (e.g. <span>)
++needsLayoutRange.start.index;
}
// SKip trailing InlineItemEnd (e.g. </span>)
ASSERT(m_inlineItemList.back().isInlineBoxEnd());
ASSERT(!needsLayoutRange.end.offset);
--needsLayoutRange.end.index;
return needsLayoutRange;
};
auto needsLayoutRange = adjustedNeedsLayoutRange();
ASSERT(!needsLayoutRange.isEmpty());
auto lineLayoutResult = m_textOnlySimpleLineBuilder.layoutInlineContent({ needsLayoutRange, lineInput.initialLogicalRect }, previousLine);
auto insertLeadingInlineBoxRun = [&] {
auto& leadingInlineItem = m_inlineItemList.front();
ASSERT(leadingInlineItem.isInlineBoxStart());
if (isFirstLine) {
ASSERT(!previousLine);
lineLayoutResult.inlineContent.insert(0, { leadingInlineItem, leadingInlineItem.firstLineStyle(), { } });
lineLayoutResult.inlineItemRange.start = lineInput.needsLayoutRange.start;
return;
}
// Subsequent lines need leading spanning inline box run.
lineLayoutResult.inlineContent.insert(0, { leadingInlineItem, { }, { } });
};
insertLeadingInlineBoxRun();
auto appendTrailingInlineBoxRunIfNeeded = [&] {
if (lineLayoutResult.inlineItemRange.end != needsLayoutRange.end)
return;
auto& trailingInlineItem = m_inlineItemList.back();
lineLayoutResult.inlineContent.append({ trailingInlineItem, isFirstLine ? trailingInlineItem.firstLineStyle() : trailingInlineItem.style(), lineLayoutResult.contentGeometry.logicalWidth });
lineLayoutResult.inlineItemRange.end = lineInput.needsLayoutRange.end;
};
appendTrailingInlineBoxRunIfNeeded();
return lineLayoutResult;
}
bool RangeBasedLineBuilder::isEligibleForRangeInlineLayout(const InlineFormattingContext& inlineFormattingContext, const InlineContentCache::InlineItems& inlineItems, const PlacedFloats& placedFloats)
{
if (inlineItems.isEmpty())
return false;
// Range based line builder only supports the following content <inline box>eligible for text only layout</inline box>
auto& inlineItemList = inlineItems.content();
auto numberOfInlineItems = inlineItemList.size();
auto isEmptyContent = hasInlineBoxesOnly(inlineItems.inlineBoxCount(), numberOfInlineItems);
auto isFullyNestedContent = inlineItems.inlineBoxCount() == 1 && inlineItemList.first().isInlineBoxStart() && inlineItemList.last().isInlineBoxEnd() && numberOfInlineItems > 2;
if (!isEmptyContent && !isFullyNestedContent)
return false;
auto hasDecorationOrBreak = [&] {
for (auto& inlineItem : inlineItemList) {
if (!inlineItem.isInlineBoxStart())
return false;
auto& inlineBox = inlineItem.layoutBox();
if (inlineFormattingContext.geometryForBox(inlineBox).horizontalMarginBorderAndPadding())
return true;
if (inlineBox.style().boxDecorationBreak() != RenderStyle::initialBoxDecorationBreak())
return true;
}
ASSERT_NOT_REACHED();
return true;
};
if (hasDecorationOrBreak()) {
// FIXME: Add start decoration support is just a matter of shrinking the available space for the first line (or on subsequent lines when decoration break is present)
return false;
}
if (inlineFormattingContext.layoutState().parentBlockLayoutState().lineClamp())
return false;
if (!isEmptyContent) {
// Check the nested text content.
if (!inlineItems.hasTextAndLineBreakOnlyContent() || inlineItems.requiresVisualReordering() || !placedFloats.isEmpty() || inlineItems.hasTextAutospace())
return false;
auto& rootStyle = inlineFormattingContext.root().style();
auto& inlineBoxStyle = inlineItemList.first().layoutBox().style();
if (inlineBoxStyle.textAlign() != rootStyle.textAlign())
return false;
if (!TextOnlySimpleLineBuilder::isEligibleForSimplifiedInlineLayoutByStyle(rootStyle) || !TextOnlySimpleLineBuilder::isEligibleForSimplifiedInlineLayoutByStyle(inlineBoxStyle))
return false;
}
return true;
}
}
}
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