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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_PHYSICAL_OFFSET_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_PHYSICAL_OFFSET_H_
#include "third_party/blink/renderer/platform/geometry/layout_point.h"
#include "third_party/blink/renderer/platform/geometry/layout_unit.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace WTF {
class String;
} // namespace WTF
namespace blink {
// PhysicalOffset is the position of a rect (typically a fragment) relative to
// its parent rect in the physical coordinate system.
// For more information about physical and logical coordinate systems, see:
// https://chromium.googlesource.com/chromium/src/+/main/third_party/blink/renderer/core/layout/README.md#coordinate-spaces
template <typename ValueType>
struct PLATFORM_EXPORT PhysicalFixedOffset {
constexpr PhysicalFixedOffset() = default;
constexpr PhysicalFixedOffset(ValueType left, ValueType top)
: left(left), top(top) {}
// This is deleted to avoid unwanted lossy conversion from float or double to
// LayoutUnit or int. Use explicit LayoutUnit constructor for each parameter,
// or use FromPointF*() instead.
PhysicalFixedOffset(double, double) = delete;
// For testing only. It's defined in core/testing/core_unit_test_helper.h.
// 'constexpr' is to let compiler detect usage from production code.
constexpr PhysicalFixedOffset(int left, int top);
ValueType left;
ValueType top;
constexpr bool IsZero() const { return !left && !top; }
constexpr bool HasFraction() const {
return left.HasFraction() || top.HasFraction();
}
void ClampNegativeToZero() {
left = std::max(left, ValueType());
top = std::max(top, ValueType());
}
constexpr bool operator==(const PhysicalFixedOffset& other) const = default;
PhysicalFixedOffset operator+(const PhysicalFixedOffset& other) const {
return PhysicalFixedOffset{this->left + other.left, this->top + other.top};
}
PhysicalFixedOffset& operator+=(const PhysicalFixedOffset& other) {
*this = *this + other;
return *this;
}
PhysicalFixedOffset operator-() const {
return PhysicalFixedOffset{-this->left, -this->top};
}
PhysicalFixedOffset operator-(const PhysicalFixedOffset& other) const {
return PhysicalFixedOffset{this->left - other.left, this->top - other.top};
}
PhysicalFixedOffset& operator-=(const PhysicalFixedOffset& other) {
*this = *this - other;
return *this;
}
// Conversions from/to existing code. New code prefers type safety for
// logical/physical distinctions.
constexpr explicit PhysicalFixedOffset(const DeprecatedLayoutPoint& point)
: left(point.X()), top(point.Y()) {}
// Conversions from/to existing code. New code prefers type safety for
// logical/physical distinctions.
constexpr DeprecatedLayoutPoint FaultyToDeprecatedLayoutPoint() const {
return {left, top};
}
explicit PhysicalFixedOffset(const gfx::Point& point)
: left(point.x()), top(point.y()) {}
explicit PhysicalFixedOffset(const gfx::Vector2d& vector)
: left(vector.x()), top(vector.y()) {}
static PhysicalFixedOffset FromPointFFloor(const gfx::PointF& point) {
return {ValueType::FromFloatFloor(point.x()),
ValueType::FromFloatFloor(point.y())};
}
static PhysicalFixedOffset FromPointFRound(const gfx::PointF& point) {
return {ValueType::FromFloatRound(point.x()),
ValueType::FromFloatRound(point.y())};
}
static PhysicalFixedOffset FromVector2dFFloor(const gfx::Vector2dF& vector) {
return {ValueType::FromFloatFloor(vector.x()),
ValueType::FromFloatFloor(vector.y())};
}
static PhysicalFixedOffset FromVector2dFRound(const gfx::Vector2dF& vector) {
return {ValueType::FromFloatRound(vector.x()),
ValueType::FromFloatRound(vector.y())};
}
void Scale(float s) {
left *= s;
top *= s;
}
constexpr explicit operator gfx::PointF() const { return {left, top}; }
constexpr explicit operator gfx::Vector2dF() const { return {left, top}; }
WTF::String ToString() const;
};
using PhysicalOffset = PhysicalFixedOffset<LayoutUnit>;
// TODO(crbug.com/41458361): These functions should upgraded to force correct
// pixel snapping in a type-safe way.
template <typename ValueType>
inline gfx::Point ToRoundedPoint(const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Round(), o.top.Round()};
}
template <typename ValueType>
inline gfx::Point ToFlooredPoint(const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Floor(), o.top.Floor()};
}
template <typename ValueType>
inline gfx::Point ToCeiledPoint(const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Ceil(), o.top.Ceil()};
}
template <typename ValueType>
inline gfx::Vector2d ToRoundedVector2d(
const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Round(), o.top.Round()};
}
template <typename ValueType>
inline gfx::Vector2d ToFlooredVector2d(
const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Floor(), o.top.Floor()};
}
template <typename ValueType>
inline gfx::Vector2d ToCeiledVector2d(const PhysicalFixedOffset<ValueType>& o) {
return {o.left.Ceil(), o.top.Ceil()};
}
template <typename ValueType>
PLATFORM_EXPORT std::ostream& operator<<(std::ostream&,
const PhysicalFixedOffset<ValueType>&);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_PHYSICAL_OFFSET_H_
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