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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
* Copyright (C) 2024 Igalia S.L.
*
* 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 "PositionArea.h"
#include <wtf/EnumTraits.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
PositionAreaSpan::PositionAreaSpan(PositionAreaAxis axis, PositionAreaTrack track, PositionAreaSelf self)
: m_axis(enumToUnderlyingType(axis))
, m_track(enumToUnderlyingType(track))
, m_self(enumToUnderlyingType(self))
{
}
static bool UNUSED_FUNCTION axisIsBlockOrX(PositionAreaAxis axis)
{
switch (axis) {
case PositionAreaAxis::Horizontal:
case PositionAreaAxis::X:
case PositionAreaAxis::Block:
return true;
default:
return false;
}
}
static bool UNUSED_FUNCTION axisIsInlineOrY(PositionAreaAxis axis)
{
switch (axis) {
case PositionAreaAxis::Vertical:
case PositionAreaAxis::Y:
case PositionAreaAxis::Inline:
return true;
default:
return false;
}
}
PositionArea::PositionArea(PositionAreaSpan blockOrXAxis, PositionAreaSpan inlineOrYAxis)
: m_blockOrXAxis(blockOrXAxis)
, m_inlineOrYAxis(inlineOrYAxis)
{
ASSERT(axisIsBlockOrX(m_blockOrXAxis.axis()));
ASSERT(axisIsInlineOrY(m_inlineOrYAxis.axis()));
}
PositionAreaSpan PositionArea::spanForAxis(BoxAxis physicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const
{
bool useSelfWritingMode = m_blockOrXAxis.self() == PositionAreaSelf::Yes;
auto writingMode = useSelfWritingMode ? selfWritingMode : containerWritingMode;
return physicalAxis == mapPositionAreaAxisToPhysicalAxis(m_blockOrXAxis.axis(), writingMode)
? m_blockOrXAxis : m_inlineOrYAxis;
}
PositionAreaSpan PositionArea::spanForAxis(LogicalBoxAxis logicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const
{
bool useSelfWritingMode = m_blockOrXAxis.self() == PositionAreaSelf::Yes;
auto writingMode = useSelfWritingMode ? selfWritingMode : containerWritingMode;
return logicalAxis == mapPositionAreaAxisToLogicalAxis(m_blockOrXAxis.axis(), writingMode)
? m_blockOrXAxis : m_inlineOrYAxis;
}
PositionAreaTrack PositionArea::coordMatchedTrackForAxis(BoxAxis physicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const
{
auto relevantSpan = spanForAxis(physicalAxis, containerWritingMode, selfWritingMode);
auto positionAxis = relevantSpan.axis();
auto track = relevantSpan.track();
bool shouldFlip = false;
if (LogicalBoxAxis::Inline == mapAxisPhysicalToLogical(containerWritingMode, physicalAxis)) {
if (isPositionAreaDirectionLogical(positionAxis)) {
shouldFlip = containerWritingMode.isInlineFlipped();
if (relevantSpan.self() == PositionAreaSelf::Yes
&& !containerWritingMode.isInlineMatchingAny(selfWritingMode))
shouldFlip = !shouldFlip;
}
} else {
shouldFlip = !isPositionAreaDirectionLogical(positionAxis)
&& containerWritingMode.isBlockFlipped();
if (relevantSpan.self() == PositionAreaSelf::Yes
&& !containerWritingMode.isBlockMatchingAny(selfWritingMode))
shouldFlip = !shouldFlip;
}
return shouldFlip ? flipPositionAreaTrack(track) : track;
}
static ItemPosition flip(ItemPosition alignment)
{
return ItemPosition::Start == alignment ? ItemPosition::End : ItemPosition::Start;
};
ItemPosition PositionArea::defaultAlignmentForAxis(BoxAxis physicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const
{
auto relevantSpan = spanForAxis(physicalAxis, containerWritingMode, selfWritingMode);
ItemPosition alignment;
switch (relevantSpan.track()) {
case PositionAreaTrack::Start:
case PositionAreaTrack::SpanStart:
alignment = ItemPosition::End;
break;
case PositionAreaTrack::End:
case PositionAreaTrack::SpanEnd:
alignment = ItemPosition::Start;
break;
case PositionAreaTrack::Center:
return ItemPosition::Center;
case PositionAreaTrack::SpanAll:
return ItemPosition::AnchorCenter;
}
// Remap for self alignment.
auto axis = relevantSpan.axis();
bool shouldFlip = false;
if (relevantSpan.self() == PositionAreaSelf::Yes && containerWritingMode != selfWritingMode) {
auto logicalAxis = mapPositionAreaAxisToLogicalAxis(axis, selfWritingMode);
if (containerWritingMode.isOrthogonal(selfWritingMode)) {
if (LogicalBoxAxis::Inline == logicalAxis)
shouldFlip = !selfWritingMode.isInlineMatchingAny(containerWritingMode);
else
shouldFlip = !selfWritingMode.isBlockMatchingAny(containerWritingMode);
} else if (LogicalBoxAxis::Inline == logicalAxis)
shouldFlip = selfWritingMode.isInlineOpposing(containerWritingMode);
else
shouldFlip = selfWritingMode.isBlockOpposing(containerWritingMode);
}
if (isPositionAreaDirectionLogical(axis))
return shouldFlip ? flip(alignment) : alignment;
ASSERT(PositionAreaAxis::Horizontal == axis || PositionAreaAxis::Vertical == axis);
if ((PositionAreaAxis::Horizontal == axis) == containerWritingMode.isHorizontal())
return containerWritingMode.isInlineFlipped() ? flip(alignment) : alignment;
return containerWritingMode.isBlockFlipped() ? flip(alignment) : alignment;
}
WTF::TextStream& operator<<(WTF::TextStream& ts, PositionAreaAxis axis)
{
switch (axis) {
case PositionAreaAxis::Horizontal: ts << "horizontal"_s; break;
case PositionAreaAxis::Vertical: ts << "vertical"_s; break;
case PositionAreaAxis::X: ts << 'x'; break;
case PositionAreaAxis::Y: ts << 'y'; break;
case PositionAreaAxis::Block: ts << "block"_s; break;
case PositionAreaAxis::Inline: ts << "inline"_s; break;
}
return ts;
}
WTF::TextStream& operator<<(WTF::TextStream& ts, PositionAreaTrack track)
{
switch (track) {
case PositionAreaTrack::Start: ts << "start"_s; break;
case PositionAreaTrack::SpanStart: ts << "span-start"_s; break;
case PositionAreaTrack::End: ts << "end"_s; break;
case PositionAreaTrack::SpanEnd: ts << "span-end"_s; break;
case PositionAreaTrack::Center: ts << "center"_s; break;
case PositionAreaTrack::SpanAll: ts << "span-all"_s; break;
}
return ts;
}
WTF::TextStream& operator<<(WTF::TextStream& ts, PositionAreaSelf self)
{
switch (self) {
case PositionAreaSelf::No: ts << "no"_s; break;
case PositionAreaSelf::Yes: ts << "yes"_s; break;
}
return ts;
}
WTF::TextStream& operator<<(WTF::TextStream& ts, PositionAreaSpan span)
{
ts << "{ axis: "_s << span.axis() << ", track: "_s << span.track() << ", self: "_s << span.self() << " }"_s;
return ts;
}
WTF::TextStream& operator<<(WTF::TextStream& ts, PositionArea positionArea)
{
ts << "{ span1: "_s << positionArea.blockOrXAxis() << ", span2: "_s << positionArea.inlineOrYAxis() << " }"_s;
return ts;
}
} // namespace WebCore
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