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sys/color: add color_rgb_shift()

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Add a function to quickly shift a RGB color up or down.
This commit is contained in:
Benjamin Valentin 2019-11-16 16:12:18 +01:00
parent ce1f383f90
commit 19e8d02715
1 changed files with 23 additions and 0 deletions
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23
sys/include/color.h
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@ -127,6 +127,29 @@ static inline void color_rgb_invert(const color_rgb_t *rgb, color_rgb_t *inv_rgb
inv_rgb->b = rgb->b ^ 0xFF; inv_rgb->b = rgb->b ^ 0xFF;
} }
/**
* @brief Shifts a given rgb color to change it's brightness
*
* @pre ((rgb != NULL) && (out != NULL))
*
* @param[in] rgb Input rgb color, that should be shifted. Must be NOT NULL
* @param[out] out Output rgb color, result of the shift. Must be NOT NULL
* @param[in] shift Amount by which the color components should be shifted.
* May be positive (shift to left) or negative (shift to right).
*/
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;
}
}
/** /**
* @brief Calculate the complementary color of a given rgb color. * @brief Calculate the complementary color of a given rgb color.
* *