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/*
* Copyright (C) 2023 Apple Inc.
*
* 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. ``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
* 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 "BaselineAlignment.h"
#include "BaselineAlignmentInlines.h"
#include "RenderBox.h"
#include "RenderStyleInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(BaselineGroup);
WTF_MAKE_TZONE_ALLOCATED_IMPL(BaselineAlignmentState);
BaselineGroup::BaselineGroup(FlowDirection blockFlow, ItemPosition childPreference)
: m_maxAscent(0), m_items()
{
m_blockFlow = blockFlow;
m_preference = childPreference;
}
void BaselineGroup::update(const RenderBox& child, LayoutUnit ascent)
{
if (m_items.add(child).isNewEntry)
m_maxAscent = std::max(m_maxAscent, ascent);
}
bool BaselineGroup::isOppositeBlockFlow(FlowDirection blockFlow) const
{
switch (blockFlow) {
case FlowDirection::TopToBottom:
return false;
case FlowDirection::LeftToRight:
return m_blockFlow == FlowDirection::RightToLeft;
case FlowDirection::RightToLeft:
return m_blockFlow == FlowDirection::LeftToRight;
default:
ASSERT_NOT_REACHED();
return false;
}
}
bool BaselineGroup::isOrthogonalBlockFlow(FlowDirection blockFlow) const
{
switch (blockFlow) {
case FlowDirection::TopToBottom:
return m_blockFlow != FlowDirection::TopToBottom;
case FlowDirection::LeftToRight:
case FlowDirection::RightToLeft:
return m_blockFlow == FlowDirection::TopToBottom;
default:
ASSERT_NOT_REACHED();
return false;
}
}
bool BaselineGroup::isCompatible(FlowDirection childBlockFlow, ItemPosition childPreference) const
{
ASSERT(isBaselinePosition(childPreference));
ASSERT(computeSize() > 0);
return ((m_blockFlow == childBlockFlow || isOrthogonalBlockFlow(childBlockFlow)) && m_preference == childPreference) || (isOppositeBlockFlow(childBlockFlow) && m_preference != childPreference);
}
BaselineAlignmentState::BaselineAlignmentState(const RenderBox& child, ItemPosition preference, LayoutUnit ascent)
{
ASSERT(isBaselinePosition(preference));
updateSharedGroup(child, preference, ascent);
}
const BaselineGroup& BaselineAlignmentState::sharedGroup(const RenderBox& child, ItemPosition preference) const
{
ASSERT(isBaselinePosition(preference));
return const_cast<BaselineAlignmentState*>(this)->findCompatibleSharedGroup(child, preference);
}
Vector<BaselineGroup>& BaselineAlignmentState::sharedGroups()
{
return m_sharedGroups;
}
void BaselineAlignmentState::updateSharedGroup(const RenderBox& child, ItemPosition preference, LayoutUnit ascent)
{
ASSERT(isBaselinePosition(preference));
BaselineGroup& group = findCompatibleSharedGroup(child, preference);
group.update(child, ascent);
}
// FIXME: Properly implement baseline-group compatibility.
// See https://github.com/w3c/csswg-drafts/issues/721
BaselineGroup& BaselineAlignmentState::findCompatibleSharedGroup(const RenderBox& child, ItemPosition preference)
{
auto blockFlowDirection = child.writingMode().blockDirection();
for (auto& group : m_sharedGroups) {
if (group.isCompatible(blockFlowDirection, preference))
return group;
}
m_sharedGroups.insert(0, BaselineGroup(blockFlowDirection, preference));
return m_sharedGroups[0];
}
} // namespace WebCore
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