Color

The color sys module supports handling RGB and HSV color.

void color_rgb2hsv(color_rgb_t * rgb, color_hsv_t * hsv)

Convert RGB color to HSV color.

Parameters

rgb:Input color encoded in RGB space hsv:Output color encoded in HSV space

void color_hsv2rgb(color_hsv_t * hsv, color_rgb_t * rgb)

Convert HSV color to RGB color.

Parameters

hsv:Input color encoded in HSV space rgb:Output color encoded in RGB space

void color_hex2rgb(const uint32_t hex, color_rgb_t * rgb)

Convert a hex value of the form 0x00RRGGBB to an RGB color struct.

Note

the two most significant bytes of hex will be ignored

Parameters

hex:Input color encoded in hex rgb:Output color encoded in RGB space

void color_rgb2hex(const color_rgb_t * rgb, uint32_t * hex)

Convert a rgb struct to a hex value of the form 0x00RRGGBB.

Note

the two most significant bytes of hex will be 0

Parameters

rgb:Input color encoded in RGB space hex:Output color encoded in hex

void color_str2rgb(const char * str, color_rgb_t * color)

Convert a hex color string of the form ‘RRGGBB’ to a color_rgb_t struct.

Note

str MUST contain only hexadecimal digits. Expect unexpected behaviour, otherwise.

Parameters

str:Input color encoded as string of the form ‘RRGGBB’ color:Output color encoded in RGB space

void color_rgb2str(const color_rgb_t * rgb, char * str)

Convert a color_rgb_t struct to a hex color string of the form ‘RRGGBB’.

Note

str MUST be big enough to hold 6 characters

Parameters

rgb:Input color encoded in RGB space str:Output color encoded as string of the form ‘RRGGBB’

void color_rgb_invert(const color_rgb_t * rgb, color_rgb_t * inv_rgb)

Invert a given rgb color.

Parameters

rgb:Input rgb color, that should be converted. Must be NOT NULL inv_rgb:Output rgb color, result of the conversion. Must be NOT NULL

void color_rgb_complementary(const color_rgb_t * rgb, color_rgb_t * comp_rgb)

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

Parameters

rgb:Input rgb color. Must be NOT NULL comp_rgb:Output rgb color, result of the complementary color calculation. Must be NOT NULL

struct color_rgb_t

Data-structure describing a RGB color.

uint8_t r

red value [0 - 255]

uint8_t g

green value [0 - 255]

uint8_t b

blue value [0 - 255]

struct color_rgba_t

RGBA color value.

color_rgb_t color

RGB value.

uint8_t alpha

alpha value [0 - 255]

struct color_hsv_t

Data-structure for holding HSV colors.

float h

hue value [0.0 - 360.0]

float s

saturation value [0.0 - 1.0]

float v

value [0.0 - 1.0]