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generate 256 palette

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This commit is contained in:
Jake Stewart 2026-02-19 19:27:51 +08:00
parent c291194a4e
commit cc0a4ba756
7 changed files with 202 additions and 2 deletions
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97
config.c
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@ -28,6 +28,7 @@
#include "tokenize.h"
#include "util.h"
#include "xmalloc.h"
#include "lab.h"
#include "xsnprintf.h"
static const uint32_t default_foreground = 0xffffff;
@ -1156,6 +1157,9 @@ parse_section_main(struct context *ctx)
return true;
}
else if (streq(key, "generate-256-palette"))
return value_to_bool(ctx, &conf->generate_256_palette);
else if (streq(key, "uppercase-regex-insert"))
return value_to_bool(ctx, &conf->uppercase_regex_insert);
@ -1410,6 +1414,7 @@ parse_color_theme(struct context *ctx, struct color_theme *theme)
size_t key_len = strlen(key);
uint8_t last_digit = (unsigned char)key[key_len - 1] - '0';
uint32_t *color = NULL;
int table_index = -1;
if (isdigit(key[0])) {
unsigned long index;
@ -1420,13 +1425,18 @@ parse_color_theme(struct context *ctx, struct color_theme *theme)
return false;
}
color = &theme->table[index];
table_index = (int)index;
}
else if (key_len == 8 && str_has_prefix(key, "regular") && last_digit < 8)
else if (key_len == 8 && str_has_prefix(key, "regular") && last_digit < 8) {
color = &theme->table[last_digit];
table_index = last_digit;
}
else if (key_len == 7 && str_has_prefix(key, "bright") && last_digit < 8)
else if (key_len == 7 && str_has_prefix(key, "bright") && last_digit < 8) {
color = &theme->table[8 + last_digit];
table_index = 8 + last_digit;
}
else if (key_len == 4 && str_has_prefix(key, "dim") && last_digit < 8) {
if (!value_to_color(ctx, &theme->dim[last_digit], false))
@ -1586,6 +1596,10 @@ parse_color_theme(struct context *ctx, struct color_theme *theme)
return false;
*color = color_value;
if (table_index >= 0)
theme->table_mask[table_index / 32] |= 1u << (table_index % 32);
return true;
}
@ -3432,6 +3446,75 @@ config_font_list_clone(struct config_font_list *dst,
}
}
static bool
table_mask_is_set(const uint32_t *mask, unsigned idx)
{
return (mask[idx / 32] >> (idx % 32)) & 1;
}
static void
generate_256_palette(uint32_t *table, const uint32_t *mask,
uint32_t bg, uint32_t fg)
{
/*
* Generate colors 16-255 by interpolating in CIELAB space.
*
* Corner mapping for trilinear interpolation:
* bg -> (r=0, g=0, b=0)
* palette[1] -> (r=1, g=0, b=0) red
* palette[2] -> (r=0, g=1, b=0) green
* palette[3] -> (r=1, g=1, b=0) yellow
* palette[4] -> (r=0, g=0, b=1) blue
* palette[5] -> (r=1, g=0, b=1) magenta
* palette[6] -> (r=0, g=1, b=1) cyan
* fg -> (r=1, g=1, b=1)
*/
struct lab base8_lab[8];
for (int i = 0; i < 8; i++)
base8_lab[i] = lab_from_rgb(table[i]);
struct lab bg_lab = lab_from_rgb(bg);
struct lab fg_lab = lab_from_rgb(fg);
/* Colors 16-231: 6x6x6 color cube via trilinear interpolation */
unsigned idx = 16;
for (unsigned ri = 0; ri < 6; ri++) {
float tr = (float)ri / 5.0f;
/* Interpolate along R axis (4 edges) */
struct lab c0 = lab_lerp(tr, bg_lab, base8_lab[1]);
struct lab c1 = lab_lerp(tr, base8_lab[2], base8_lab[3]);
struct lab c2 = lab_lerp(tr, base8_lab[4], base8_lab[5]);
struct lab c3 = lab_lerp(tr, base8_lab[6], fg_lab);
for (unsigned gi = 0; gi < 6; gi++) {
float tg = (float)gi / 5.0f;
/* Interpolate along G axis (2 edges) */
struct lab c4 = lab_lerp(tg, c0, c1);
struct lab c5 = lab_lerp(tg, c2, c3);
for (unsigned bi = 0; bi < 6; bi++) {
if (!table_mask_is_set(mask, idx)) {
/* Interpolate along B axis */
struct lab c6 = lab_lerp((float)bi / 5.0f, c4, c5);
table[idx] = lab_to_rgb(c6);
}
idx++;
}
}
}
/* Colors 232-255: grayscale ramp from bg to fg */
for (unsigned i = 0; i < 24; i++) {
if (!table_mask_is_set(mask, idx)) {
float t = (float)(i + 1) / 25.0f;
table[idx] = lab_to_rgb(lab_lerp(t, bg_lab, fg_lab));
}
idx++;
}
}
bool
config_load(struct config *conf, const char *conf_path,
user_notifications_t *initial_user_notifications,
@ -3528,6 +3611,7 @@ config_load(struct config *conf, const char *conf_path,
},
},
.initial_color_theme = COLOR_THEME_DARK,
.generate_256_palette = true,
.cursor = {
.style = CURSOR_BLOCK,
.unfocused_style = CURSOR_UNFOCUSED_HOLLOW,
@ -3715,6 +3799,15 @@ config_load(struct config *conf, const char *conf_path,
if (!config_override_apply(conf, overrides, errors_are_fatal))
ret = !errors_are_fatal;
if (conf->generate_256_palette) {
generate_256_palette(
conf->colors_dark.table, conf->colors_dark.table_mask,
conf->colors_dark.bg, conf->colors_dark.fg);
generate_256_palette(
conf->colors_light.table, conf->colors_light.table_mask,
conf->colors_light.bg, conf->colors_light.fg);
}
if (ret && conf->fonts[0].count == 0) {
struct config_font font;
if (!config_font_parse("monospace", &font)) {