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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NGLogicalOffset_h
#define NGLogicalOffset_h
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/text/text_direction.h"
#include "third_party/blink/renderer/platform/text/writing_mode.h"
namespace blink {
struct NGLogicalDelta;
struct NGLogicalSize;
struct NGPhysicalOffset;
struct NGPhysicalSize;
// NGLogicalOffset is the position of a rect (typically a fragment) relative to
// its parent rect in the logical coordinate system.
struct CORE_EXPORT NGLogicalOffset {
NGLogicalOffset() = default;
NGLogicalOffset(LayoutUnit inline_offset, LayoutUnit block_offset)
: inline_offset(inline_offset), block_offset(block_offset) {}
LayoutUnit inline_offset;
LayoutUnit block_offset;
// Converts a logical offset to a physical offset. See:
// https://drafts.csswg.org/css-writing-modes-3/#logical-to-physical
// PhysicalOffset will be the physical top left point of the rectangle
// described by offset + inner_size. Setting inner_size to 0,0 will return
// the same point.
// @param outer_size the size of the rect (typically a fragment).
// @param inner_size the size of the inner rect (typically a child fragment).
NGPhysicalOffset ConvertToPhysical(WritingMode,
TextDirection,
NGPhysicalSize outer_size,
NGPhysicalSize inner_size) const;
bool operator==(const NGLogicalOffset& other) const;
bool operator!=(const NGLogicalOffset& other) const;
NGLogicalOffset operator+(const NGLogicalOffset& other) const;
NGLogicalOffset operator+(const NGLogicalSize& size) const;
NGLogicalOffset& operator+=(const NGLogicalOffset& other);
NGLogicalOffset& operator+=(const NGLogicalSize& size);
NGLogicalDelta operator-(const NGLogicalOffset& other) const;
NGLogicalOffset& operator-=(const NGLogicalOffset& other);
bool operator>(const NGLogicalOffset& other) const;
bool operator>=(const NGLogicalOffset& other) const;
bool operator<(const NGLogicalOffset& other) const;
bool operator<=(const NGLogicalOffset& other) const;
String ToString() const;
};
CORE_EXPORT std::ostream& operator<<(std::ostream&, const NGLogicalOffset&);
} // namespace blink
#endif // NGLogicalOffset_h
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