sc7-testo-firmware/include/hsv2rgb.h

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#ifndef _INC_HSV2RGB_H
#define _INC_HSV2RGB_H
#include <stdint.h>
typedef struct color_rgb {
uint8_t r;
uint8_t g;
uint8_t b;
} color_rgb;
typedef struct color_hsv {
int16_t h;
uint8_t s;
uint8_t v;
} color_hsv;
#define HSV_HUE_SEXTANT 256
#define HSV_HUE_STEPS (6 * HSV_HUE_SEXTANT)
#define HSV_HUE_MIN 0
#define HSV_HUE_MAX (HSV_HUE_STEPS - 1)
#define HSV_SAT_MIN 0
#define HSV_SAT_MAX 255
#define HSV_VAL_MIN 0
#define HSV_VAL_MAX 255
/* Options: */
#define HSV_USE_SEXTANT_TEST /* Limit the hue to 0...360 degrees */
void hsv2rgb_8b(int16_t h, uint8_t s, uint8_t v, uint8_t *r, uint8_t *g , uint8_t *b);
/*
* Macros that are common to all implementations
*/
#ifdef HSV_USE_SEXTANT_TEST
#define HSV_SEXTANT_TEST(sextant) \
if((sextant) > 5) { \
(sextant) = 5; \
}
#else
#define HSV_SEXTANT_TEST(sextant)
#endif
/*
* Pointer swapping:
* sext. r g b r<>b g<>b r <> g result
* 0 0 0 v u c !u v c u v c
* 0 0 1 d v c d v c
* 0 1 0 c v u u v c u v c
* 0 1 1 c d v v d c d v c d v c
* 1 0 0 u c v u v c u v c
* 1 0 1 v c d v d c d v c d v c
*
* if(sextant & 2)
* r <-> b
*
* if(sextant & 4)
* g <-> b
*
* if(!(sextant & 6) {
* if(!(sextant & 1))
* r <-> g
* } else {
* if(sextant & 1)
* r <-> g
* }
*/
#define HSV_SWAPPTR(a,b) do { uint8_t *tmp = (a); (a) = (b); (b) = tmp; } while(0)
#define HSV_POINTER_SWAP(sextant,r,g,b) \
do { \
if((sextant) & 2) { \
HSV_SWAPPTR((r), (b)); \
} \
if((sextant) & 4) { \
HSV_SWAPPTR((g), (b)); \
} \
if(!((sextant) & 6)) { \
if(!((sextant) & 1)) { \
HSV_SWAPPTR((r), (g)); \
} \
} else { \
if((sextant) & 1) { \
HSV_SWAPPTR((r), (g)); \
} \
} \
} while(0)
#endif /* _INC_HSV2RGB_H */