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