color.h

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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.
 */
 
#ifndef COLOR_H
#define COLOR_H
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
typedef struct {
    uint8_t r;          
    uint8_t g;          
    uint8_t b;          
} color_rgb_t;
 
typedef struct {
    color_rgb_t color;  
    uint8_t alpha;      
} color_rgba_t;
 
typedef struct {
    float h;            
    float s;            
    float v;            
} color_hsv_t;
 
void color_rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv);
 
void color_hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb);
 
void color_hex2rgb(const uint32_t hex, color_rgb_t *rgb);
 
void color_rgb2hex(const color_rgb_t *rgb, uint32_t *hex);
 
void color_str2rgb(const char *str, color_rgb_t *color);
 
void color_rgb2str(const color_rgb_t *rgb, char *str);
 
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;
}
 
static inline void color_rgb_shift(const color_rgb_t *rgb, color_rgb_t *out, int8_t shift)
{
    if (shift > 0) {
        out->r = rgb->r << shift;
        out->g = rgb->g << shift;
        out->b = rgb->b << shift;
    } else {
        out->r = rgb->r >> -shift;
        out->g = rgb->g >> -shift;
        out->b = rgb->b >> -shift;
    }
}
 
static inline void color_rgb_set_brightness(const color_rgb_t *rgb, color_rgb_t *out, uint8_t level)
{
    out->r = ((unsigned)rgb->r * level + 128) >> 8;
    out->g = ((unsigned)rgb->g * level + 128) >> 8;
    out->b = ((unsigned)rgb->b * level + 128) >> 8;
}
 
void color_rgb_complementary(const color_rgb_t *rgb, color_rgb_t *comp_rgb);
 
#ifdef __cplusplus
}
#endif
 
#endif /* COLOR_H */