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/*
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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,
* 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.
*/
#pragma once
#include <WebCore/WritingMode.h>
namespace WebCore {
namespace Style {
// The axis that the span specifies.
// Represented as 3 bits: axis type, direction type, [Logical]BoxAxis value.
enum class PositionAreaAxis : uint8_t {
// Physical axes × Physical directions.
Horizontal = 0b000,
Vertical = 0b001,
// Physical axes × Logical directions.
X = 0b010,
Y = 0b011,
// Logical axes × Logical directions.
Inline = 0b110,
Block = 0b111,
};
// Get the opposite axis of a given axis.
constexpr PositionAreaAxis oppositePositionAreaAxis(PositionAreaAxis axis)
{
switch (axis) {
case PositionAreaAxis::Horizontal:
return PositionAreaAxis::Vertical;
case PositionAreaAxis::Vertical:
return PositionAreaAxis::Horizontal;
case PositionAreaAxis::X:
return PositionAreaAxis::Y;
case PositionAreaAxis::Y:
return PositionAreaAxis::X;
case PositionAreaAxis::Block:
return PositionAreaAxis::Inline;
case PositionAreaAxis::Inline:
return PositionAreaAxis::Block;
}
ASSERT_NOT_REACHED_UNDER_CONSTEXPR_CONTEXT();
return PositionAreaAxis::Horizontal;
}
constexpr bool isPositionAreaAxisLogical(PositionAreaAxis positionAxis)
{
constexpr uint8_t axisBit = 0b100;
return static_cast<uint8_t>(positionAxis) & axisBit;
}
constexpr bool isPositionAreaDirectionLogical(PositionAreaAxis positionAxis)
{
constexpr uint8_t directionBit = 0b010;
return static_cast<uint8_t>(positionAxis) & directionBit;
}
constexpr BoxAxis mapPositionAreaAxisToPhysicalAxis(PositionAreaAxis positionAxis, WritingMode writingMode)
{
constexpr uint8_t orientationBit = 0b001;
auto physicalAxis = static_cast<uint8_t>(positionAxis) & orientationBit;
if (isPositionAreaAxisLogical(positionAxis) && writingMode.isVertical())
physicalAxis = !physicalAxis;
return static_cast<BoxAxis>(physicalAxis);
}
constexpr LogicalBoxAxis mapPositionAreaAxisToLogicalAxis(PositionAreaAxis positionAxis, WritingMode writingMode)
{
constexpr uint8_t orientationBit = 0b001;
auto logicalAxis = static_cast<uint8_t>(positionAxis) & orientationBit;
if (!isPositionAreaAxisLogical(positionAxis) && writingMode.isVertical())
logicalAxis = !logicalAxis;
return static_cast<LogicalBoxAxis>(logicalAxis);
}
// MARK: - Logging
WTF::TextStream& operator<<(WTF::TextStream&, PositionAreaAxis);
} // namespace Style
} // namespace WebCore
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