static inline int find_nearest_color(struct rgb *r, int l)
{
int dist, dst, min, i;
static struct rgb_cache_entry rgb_cache[RGB_HASH_SIZE];
static int cache_init = 0;
int h;
if (!cache_init) goto initialize;
back:
h = HASH_RGB(r, l);
if (rgb_cache[h].color != -1 && rgb_cache[h].l == l && rgb_cache[h].rgb.r == r->r && rgb_cache[h].rgb.g == r->g && rgb_cache[h].rgb.b == r->b) return rgb_cache[h].color;
dist = 0xffffff;
min = 0;
for (i = 0; i < l; i++) if ((dst = color_distance(r, &palette[i])) < dist)
dist = dst, min = i;
rgb_cache[h].color = min;
rgb_cache[h].l = l;
rgb_cache[h].rgb.r = r->r;
rgb_cache[h].rgb.g = r->g;
rgb_cache[h].rgb.b = r->b;
return min;
initialize:
for (h = 0; h < RGB_HASH_SIZE; h++) rgb_cache[h].color = -1;
cache_init = 1;
goto back;
}
/* Locates the nearest terminal color. */
static inline unsigned char
get_color(color_T color, struct rgb *palette, int level)
{
static struct rgb_cache_entry cache[RGB_HASH_SIZE];
struct rgb_cache_entry *rgb_cache = &cache[HASH_RGB(color, level)];
/* Uninitialized cache entries have level set to zero. */
if (rgb_cache->level == 0
|| rgb_cache->level != level
|| rgb_cache->rgb != color) {
struct rgb rgb = INIT_RGB(color);
unsigned char nearest_color = 0;
int min_dist = color_distance(&rgb, &palette[0]);
int i;
#ifdef CONFIG_DEBUG
if (level <= 0)
INTERNAL("get_color() called with @level <= 0");
#endif
for (i = 1; i < level; i++) {
int dist = color_distance(&rgb, &palette[i]);
if (dist < min_dist) {
min_dist = dist;
nearest_color = i;
}
}
rgb_cache->color = nearest_color;
rgb_cache->level = level;
rgb_cache->rgb = color;
}
return rgb_cache->color;
}
