colors

extract colors from pictures
git clone git://git.2f30.org/colors.git
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commit 9397ccddc296f69bb2e159313383dcf646f258b3
parent d2660bf89da280e85ebb114f2e85845486e9d1e9
Author: lostd <lostd@2f30.org>
Date:   Sat Jun  6 10:39:49 +0100

Hue selector on the whole rgb hue range

Diffstat:
colors.c | 50+++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 39 insertions(+), 11 deletions(-)
diff --git a/colors.c b/colors.c @@ -102,25 +102,53 @@ initcluster_rand(struct cluster *c, int unused) c->center = *p; } -struct point huetab[] = { - { .x = 0xff, .y = 0x00, .z = 0x00 }, /* red */ - { .x = 0xff, .y = 0x00, .z = 0xff }, /* purple */ - { .x = 0x00, .y = 0x00, .z = 0xff }, /* blue */ - { .x = 0x00, .y = 0xff, .z = 0xff }, /* cyan */ - { .x = 0x00, .y = 0xff, .z = 0x00 }, /* green */ - { .x = 0xff, .y = 0xff, .z = 0x00 }, /* yellow */ +struct hue { + int rgb[3]; + int i; /* index in rgb[] of color to change next */ +} huetab[] = { + { { 0xff, 0x00, 0x00 }, 2 }, /* red */ + { { 0xff, 0x00, 0xff }, 0 }, /* purple */ + { { 0x00, 0x00, 0xff }, 1 }, /* blue */ + { { 0x00, 0xff, 0xff }, 2 }, /* cyan */ + { { 0x00, 0xff, 0x00 }, 0 }, /* green */ + { { 0xff, 0xff, 0x00 }, 1 }, /* yellow */ }; +struct point +hueselect(int i) +{ + struct point p; + struct hue h; + int idx, mod; + + idx = i / 256; + mod = i % 256; + h = huetab[idx]; + + switch (h.rgb[h.i]) { + case 0x00: + h.rgb[h.i] += mod; + break; + case 0xff: + h.rgb[h.i] -= mod; + break; + } + p.x = h.rgb[0]; + p.y = h.rgb[1]; + p.z = h.rgb[2]; + return p; +} + void initcluster_hue(struct cluster *c, int i) { TAILQ_INIT(&c->members); c->nmembers = 0; - c->center = huetab[i]; + c->center = hueselect(i); } void (*initcluster)(struct cluster *c, int i) = initcluster_brightness; -size_t initspace = 0xff; +size_t initspace = 256; void initclusters(struct cluster *c, size_t n) @@ -267,11 +295,11 @@ main(int argc, char *argv[]) if (rflag) { srand(time(NULL)); initcluster = initcluster_rand; - initspace = 0xff * 0xff * 0xff; + initspace = 256 * 256 * 256; } if (hflag) { initcluster = initcluster_hue; - initspace = LEN(huetab); + initspace = LEN(huetab) * 256; } /* cap number of clusters */ if (nclusters > initspace)