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c04e09a770
type.h: 针对c++使用了c++23的using语法定义typedef memory.h/memory.c 提供了不对齐拷贝32位值的实现 其他大部分头文件，只是提供了c++的头文件支持
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
#pragma once
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/*
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* This file is part of libn3ds
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* Copyright (C) 2024 profi200
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "types.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**
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* @brief Converts 8-bit RGBA components to 4-bit with nearest rounding.
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*
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* @param[in] c The 8-bit color component.
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*
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* @return The color component converted to 4-bit format.
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*/
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static inline u32 rgbEight2Four(const u32 c)
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{
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// No rounding errors for 0-255.
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return (15 * c + 135)>>8;
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}
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/**
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* @brief Converts 8-bit RGBA components to 5-bit with nearest rounding.
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*
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* @param[in] c The 8-bit color component.
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*
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* @return The color component converted to 5-bit format.
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*/
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static inline u32 rgbEight2Five(const u32 c)
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{
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// No rounding errors for 0-255.
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return (249 * c + 1024)>>11;
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}
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/**
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* @brief Converts 8-bit RGBA components to 6-bit with nearest rounding.
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*
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* @param[in] c The 8-bit color component.
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*
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* @return The color component converted to 6-bit format.
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*/
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static inline u32 rgbEight2Six(const u32 c)
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{
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// No rounding errors for 0-255.
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return (253 * c + 512)>>10;
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}
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/**
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* @brief Converts 4-bit RGBA components to 8-bit with nearest rounding.
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*
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* @param[in] c The 4-bit color component.
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*
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* @return The color component converted to 8-bit format.
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*/
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static inline u32 rgbFour2Eight(const u32 c)
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{
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// No rounding errors for 0-15.
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return 17 * c;
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}
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/**
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* @brief Converts 5-bit RGBA components to 8-bit with nearest rounding.
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*
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* @param[in] c The 5-bit color component.
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*
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* @return The color component converted to 8-bit format.
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*/
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static inline u32 rgbFive2Eight(const u32 c)
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{
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// No rounding errors for 0-31.
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return (527 * c + 23)>>6;
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}
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/**
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* @brief Converts 6-bit RGBA components to 8-bit with nearest rounding.
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*
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* @param[in] c The 6-bit color component.
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*
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* @return The color component converted to 8-bit format.
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*/
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static inline u32 rgbSix2Eight(const u32 c)
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{
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// No rounding errors for 0-63.
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return (259 * c + 33)>>6;
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif |