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sys: added color module

dev/timer
Hauke Petersen 9 years ago committed by Hauke Petersen
parent
commit
839955cd05
  1. 3
      sys/Makefile
  2. 2
      sys/color/Makefile
  3. 127
      sys/color/color.c
  4. 62
      sys/include/color.h

3
sys/Makefile

@ -91,5 +91,8 @@ endif
ifneq (,$(filter oneway_malloc,$(USEMODULE)))
DIRS += oneway-malloc
endif
ifneq (,$(filter color,$(USEMODULE)))
DIRS += color
endif
include $(RIOTBASE)/Makefile.base

2
sys/color/Makefile

@ -0,0 +1,2 @@
MODULE = color
include $(RIOTBASE)/Makefile.base

127
sys/color/color.c

@ -0,0 +1,127 @@
/*
* Copyright (C) 2014 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.
*/
/**
* @ingroup sys_color
* @{
*
* @file
* @brief Implementation of color module
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include "color.h"
void color_rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv)
{
float rd, gd, bd, delta, rc, gc, bc;
/* norm RGB colors to the range [0 - 1.0] */
rd = (float)rgb->r / 255.0f;
gd = (float)rgb->g / 255.0f;
bd = (float)rgb->b / 255.0f;
/* find value as maximum of the three colors */
if (rd >= gd) {
hsv->v = (rd >= bd) ? rd : bd;
}
else {
hsv->v = (gd >= bd) ? gd : bd;
}
/* compute delta from value and minimum of the three RGB colors */
if (rd <= gd) {
delta = (rd <= bd) ? (hsv->v - rd) : (hsv->v - bd);
}
else {
delta = (gd <= bd) ? (hsv->v - gd) : (hsv->v - bd);
}
/* find the saturation from value and delta */
hsv->s = (hsv->v != 0.0f) ? (delta / hsv->v) : 0x0f;
/* compute hue */
hsv->h = 0.0f;
if (hsv->s != 0.0) {
rc = (hsv->v - rd) / delta;
gc = (hsv->v - gd) / delta;
bc = (hsv->v - bd) / delta;
if (rd == hsv->v) {
hsv->h = bc - gc;
}
else if (gd == hsv->v) {
hsv->h = 2.0f + rc - bc;
}
else {
hsv->h = 4.0f + gc - rc;
}
hsv->h *= 60.0f;
if (hsv->h < 0.0f) {
hsv->h += 360.0;
}
}
}
void color_hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb)
{
int i;
float aa, bb, cc, f, h;
if (hsv->s == 0.0f) {
rgb->r = (uint8_t)(hsv->v * 255.0f);
rgb->g = (uint8_t)(hsv->v * 255.0f);
rgb->b = (uint8_t)(hsv->v * 255.0f);
}
else {
h = (hsv->h == 360.0f) ? 0.0 : hsv->h;
h /= 60.0f;
i = (int)h;
f = h - i;
aa = hsv->v * (1.0f - hsv->s);
bb = hsv->v * (1.0f - (hsv->s * f));
cc = hsv->v * (1.0f - (hsv->s * (1.0f - f)));
switch (i) {
case 0:
rgb->r = (uint8_t)(hsv->v * 255.0f);
rgb->g = (uint8_t)(cc * 255.0f);
rgb->b = (uint8_t)(aa * 255.0f);
break;
case 1:
rgb->r = (uint8_t)(bb * 255.0f);
rgb->g = (uint8_t)(hsv->v * 255.0f);
rgb->b = (uint8_t)(aa * 255.0f);
break;
case 2:
rgb->r = (uint8_t)(aa * 255.0f);
rgb->g = (uint8_t)(hsv->v * 255.0f);
rgb->b = (uint8_t)(cc * 255.0f);
break;
case 3:
rgb->r = (uint8_t)(aa * 255.0f);
rgb->g = (uint8_t)(bb * 255.0f);
rgb->b = (uint8_t)(hsv->v * 255.0f);
break;
case 4:
rgb->r = (uint8_t)(cc * 255.0f);
rgb->g = (uint8_t)(aa * 255.0f);
rgb->b = (uint8_t)(hsv->v * 255.0f);
break;
case 5:
rgb->r = (uint8_t)(hsv->v * 255.0f);
rgb->g = (uint8_t)(aa * 255.0f);
rgb->b = (uint8_t)(bb * 255.0f);
break;
}
}
}

62
sys/include/color.h

@ -0,0 +1,62 @@
/*
* Copyright (C) 2014 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.
*/
/**
* @defgroup sys_color Module for handling colors
* @ingroup sys
* @brief The color sys module supports handling RGB and HSV color
* @{
*
* @file
* @brief Headers for the color handling module
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef __COLOR_H
#define __COLOR_H
#include <stdint.h>
/**
* @name Data-structure describing a RGB color
*/
typedef struct {
uint8_t r; /**< red value [0 - 255] */
uint8_t g; /**< green value [0 - 255] */
uint8_t b; /**< blue value [0 - 255] */
} color_rgb_t;
/**
* @name Data-structure for holding HSV colors
*/
typedef struct {
float h; /**< hue value [0.0 - 360.0] */
float s; /**< saturation value [0.0 - 1.0] */
float v; /**< value [0.0 - 1.0] */
} color_hsv_t;
/**
* @brief Convert RGB color to HSV color
*
* @param[in] rgb Input color encoded in RGB space
* @param[out] hsv Output color encoded in HSV space
*/
void color_rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv);
/**
* @brief Convert HSV color to RGB color
*
* @param[in] hsv Input color encoded in HSV space
* @param[out] rgb Output color encoded in RGB space
*/
void color_hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb);
#endif /* __COLOR_H */
/** @} */
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