transform.h

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Raspberry Pi Ltd
 *
 * 2D plane transforms
 */
 
#pragma once
 
#include <optional>
 
namespace libcamera {
 
enum class Orientation;
 
enum class Transform : int {
    Identity = 0,
    Rot0 = Identity,
    HFlip = 1,
    VFlip = 2,
    HVFlip = HFlip | VFlip,
    Rot180 = HVFlip,
    Transpose = 4,
    Rot270 = HFlip | Transpose,
    Rot90 = VFlip | Transpose,
    Rot180Transpose = HFlip | VFlip | Transpose
};
 
constexpr Transform operator&(Transform t0, Transform t1)
{
    return static_cast<Transform>(static_cast<int>(t0) & static_cast<int>(t1));
}
 
constexpr Transform operator|(Transform t0, Transform t1)
{
    return static_cast<Transform>(static_cast<int>(t0) | static_cast<int>(t1));
}
 
constexpr Transform operator^(Transform t0, Transform t1)
{
    return static_cast<Transform>(static_cast<int>(t0) ^ static_cast<int>(t1));
}
 
constexpr Transform &operator&=(Transform &t0, Transform t1)
{
    return t0 = t0 & t1;
}
 
constexpr Transform &operator|=(Transform &t0, Transform t1)
{
    return t0 = t0 | t1;
}
 
constexpr Transform &operator^=(Transform &t0, Transform t1)
{
    return t0 = t0 ^ t1;
}
 
Transform operator*(Transform t0, Transform t1);
 
Transform operator-(Transform t);
 
constexpr bool operator!(Transform t)
{
    return t == Transform::Identity;
}
 
constexpr Transform operator~(Transform t)
{
    return static_cast<Transform>(~static_cast<int>(t) & 7);
}
 
std::optional<Transform> transformFromRotation(int angle);
 
Transform operator/(const Orientation &o1, const Orientation &o2);
Orientation operator*(const Orientation &o, const Transform &t);
 
const char *transformToString(Transform t);
 
} /* namespace libcamera */