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/*
* Copyright (C) 2019 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 "InlineLine.h"
#include "LayoutState.h"
namespace WebCore {
namespace Layout {
bool InlineFormattingContext::Quirks::lineDescentNeedsCollapsing(const Line::RunList& runList) const
{
// Collapse line descent in limited and full quirk mode when there's no baseline aligned content or
// the baseline aligned content has no descent.
auto& layoutState = this->layoutState();
if (!layoutState.inQuirksMode() && !layoutState.inLimitedQuirksMode())
return false;
for (auto& run : runList) {
auto& layoutBox = run->layoutBox();
if (run->isContainerEnd() || layoutBox.style().verticalAlign() != VerticalAlign::Baseline)
continue;
if (run->isLineBreak())
return false;
if (run->isText()) {
if (!run->isVisuallyEmpty())
return false;
continue;
}
if (run->isContainerStart()) {
auto& boxGeometry = formattingContext().geometryForBox(layoutBox);
if (boxGeometry.horizontalBorder() || (boxGeometry.horizontalPadding() && boxGeometry.horizontalPadding().value()))
return false;
continue;
}
if (run->isBox()) {
if (layoutBox.isInlineBlockBox() && layoutBox.establishesInlineFormattingContext()) {
auto& formattingState = downcast<InlineFormattingState>(layoutState.establishedFormattingState(downcast<Container>(layoutBox)));
ASSERT(!formattingState.lineBoxes().isEmpty());
auto inlineBlockBaseline = formattingState.lineBoxes().last().baseline();
if (inlineBlockBaseline.descent())
return false;
}
continue;
}
ASSERT_NOT_REACHED();
}
return true;
}
Line::InitialConstraints::HeightAndBaseline InlineFormattingContext::Quirks::lineHeightConstraints(const Box& formattingRoot) const
{
// computedLineHeight takes font-size into account when line-height is not set.
// Strut is the imaginary box that we put on every line. It sets the initial vertical constraints for each new line.
auto strutHeight = formattingRoot.style().computedLineHeight();
auto strutBaselineOffset = Line::halfLeadingMetrics(formattingRoot.style().fontMetrics(), strutHeight).ascent();
if (layoutState().inNoQuirksMode())
return { strutHeight, strutBaselineOffset, { } };
auto lineHeight = formattingRoot.style().lineHeight();
if (lineHeight.isPercentOrCalculated()) {
auto initialBaselineOffset = Line::halfLeadingMetrics(formattingRoot.style().fontMetrics(), { }).ascent();
return { initialBaselineOffset, initialBaselineOffset, LineBox::Baseline { strutBaselineOffset, strutHeight - strutBaselineOffset } };
}
// FIXME: The only reason why we use intValue() here is to match current inline tree (integral)behavior.
auto initialLineHeight = LayoutUnit { lineHeight.intValue() };
auto initialBaselineOffset = Line::halfLeadingMetrics(formattingRoot.style().fontMetrics(), initialLineHeight).ascent();
return { initialLineHeight, initialBaselineOffset, LineBox::Baseline { strutBaselineOffset, strutHeight - strutBaselineOffset } };
}
}
}
#endif