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Diffstat (limited to 'src/ipa/rkisp1/utils.h')
-rw-r--r-- | src/ipa/rkisp1/utils.h | 65 |
1 files changed, 0 insertions, 65 deletions
diff --git a/src/ipa/rkisp1/utils.h b/src/ipa/rkisp1/utils.h deleted file mode 100644 index 5f38b50b..00000000 --- a/src/ipa/rkisp1/utils.h +++ /dev/null @@ -1,65 +0,0 @@ -/* SPDX-License-Identifier: LGPL-2.1-or-later */ -/* - * Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com> - * - * Miscellaneous utility functions specific to rkisp1 - */ - -#pragma once - -#include <cmath> -#include <type_traits> - -namespace libcamera { - -namespace ipa::rkisp1::utils { - -#ifndef __DOXYGEN__ -template<unsigned int I, unsigned int F, typename R, typename T, - std::enable_if_t<std::is_integral_v<R> && - std::is_floating_point_v<T>> * = nullptr> -#else -template<unsigned int I, unsigned int F, typename R, typename T> -#endif -constexpr R floatingToFixedPoint(T number) -{ - static_assert(sizeof(int) >= sizeof(R)); - static_assert(I + F <= sizeof(R) * 8); - - /* - * The intermediate cast to int is needed on arm platforms to properly - * cast negative values. See - * https://embeddeduse.com/2013/08/25/casting-a-negative-float-to-an-unsigned-int/ - */ - R mask = (1 << (F + I)) - 1; - R frac = static_cast<R>(static_cast<int>(std::round(number * (1 << F)))) & mask; - - return frac; -} - -#ifndef __DOXYGEN__ -template<unsigned int I, unsigned int F, typename R, typename T, - std::enable_if_t<std::is_floating_point_v<R> && - std::is_integral_v<T>> * = nullptr> -#else -template<unsigned int I, unsigned int F, typename R, typename T> -#endif -constexpr R fixedToFloatingPoint(T number) -{ - static_assert(sizeof(int) >= sizeof(T)); - static_assert(I + F <= sizeof(T) * 8); - - /* - * Recreate the upper bits in case of a negative number by shifting the sign - * bit from the fixed point to the first bit of the unsigned and then right shifting - * by the same amount which keeps the sign bit in place. - * This can be optimized by the compiler quite well. - */ - int remaining_bits = sizeof(int) * 8 - (I + F); - int t = static_cast<int>(static_cast<unsigned>(number) << remaining_bits) >> remaining_bits; - return static_cast<R>(t) / static_cast<R>(1 << F); -} - -} /* namespace ipa::rkisp1::utils */ - -} /* namespace libcamera */ |