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/*
* Copyright (C) 2014 - 2016 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @defgroup sys_color Color
* @ingroup sys
* @brief The color sys module supports handling RGB and HSV color
* @{
*
* @file
* @brief Headers for the color handling module
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @author Cenk Gündoğan <mail@cgundogan.de>
* @author Simon Brummer <brummer.simon@googlemail.com>
*/
#ifndef COLOR_H
#define COLOR_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Data-structure describing a RGB color
*/
typedef struct {
uint8_t r; /**< red value [0 - 255] */
uint8_t g; /**< green value [0 - 255] */
uint8_t b; /**< blue value [0 - 255] */
} color_rgb_t;
/**
* @brief Data-structure for holding HSV colors
*/
typedef struct {
float h; /**< hue value [0.0 - 360.0] */
float s; /**< saturation value [0.0 - 1.0] */
float v; /**< value [0.0 - 1.0] */
} color_hsv_t;
/**
* @brief Convert RGB color to HSV color
*
* @param[in] rgb Input color encoded in RGB space
* @param[out] hsv Output color encoded in HSV space
*/
void color_rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv);
/**
* @brief Convert HSV color to RGB color
*
* @param[in] hsv Input color encoded in HSV space
* @param[out] rgb Output color encoded in RGB space
*/
void color_hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb);
/**
* @brief Convert a @p hex value of the form 0x00RRGGBB to an RGB color struct
*
* @note the two most significant bytes of @p hex will be ignored
*
* @param[in] hex Input color encoded in hex
* @param[out] rgb Output color encoded in RGB space
*/
void color_hex2rgb(const uint32_t hex, color_rgb_t *rgb);
/**
* @brief Convert a @p rgb struct to a @p hex value of the form 0x00RRGGBB
*
* @note the two most significant bytes of @p hex will be 0
*
* @param[in] rgb Input color encoded in RGB space
* @param[out] hex Output color encoded in hex
*/
void color_rgb2hex(const color_rgb_t *rgb, uint32_t *hex);
/**
* @brief Convert a hex color string of the form 'RRGGBB' to a color_rgb_t struct
*
* @note @p str MUST contain only hexadecimal digits.
* Expect unexpected behaviour, otherwise.
*
* @param[in] str Input color encoded as string of the form 'RRGGBB'
* @param[out] rgb Output color encoded in RGB space
*/
void color_str2rgb(const char *str, color_rgb_t *color);
/**
* @brief Convert a color_rgb_t struct to a hex color string of the form 'RRGGBB'
*
* @note @p str MUST be big enough to hold 6 characters
*
* @param[in] rgb Input color encoded in RGB space
* @param[out] str Output color encoded as string of the form 'RRGGBB'
*/
void color_rgb2str(const color_rgb_t *rgb, char *str);
/**
* @brief Invert a given rgb color
*
* @pre ((rgb != NULL) && (inv_rgb != NULL))
*
* @param[in] rgb Input rgb color, that should be converted. Must be NOT NULL
* @param[out] inv_rgb Output rgb color, result of the conversion. Must be NOT NULL
*/
static inline void color_rgb_invert(const color_rgb_t *rgb, color_rgb_t *inv_rgb)
{
inv_rgb->r = rgb->r ^ 0xFF;
inv_rgb->g = rgb->g ^ 0xFF;
inv_rgb->b = rgb->b ^ 0xFF;
}
/**
* @brief Calculate the complementary color of a given rgb color.
*
* @note Complementary color calculation according to adobe illustator calculations.
* See https://helpx.adobe.com/illustrator/using/adjusting-colors.html
*
* @pre ((rgb != NULL) && (comp_rgb != NULL))
*
* @param[in] rgb Input rgb color. Must be NOT NULL
* @param[out] comp_rgb Output rgb color, result of the complementary color calculation. Must be NOT NULL
*/
void color_rgb_complementary(const color_rgb_t *rgb, color_rgb_t *comp_rgb);
#ifdef __cplusplus
}
#endif
#endif /* COLOR_H */
/** @} */
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