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Add generate_256_palette_color for single-index color generation

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Co-authored-by: kovidgoyal <1308621+kovidgoyal@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-03-27 15:41:45 +00:00 • committed by GitHub
parent 7e5aac2e2b
commit 2f55eae27d
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1 changed files with 36 additions and 4 deletions
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40
kitty/colors.c
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@ -181,8 +181,7 @@ lerp_lab(float t, float *a, float *b, float *out) {
// For more information, see
// https://gist.github.com/jake-stewart/0a8ea46159a7da2c808e5be2177e1783
static void
generate_256_palette(ColorProfile *self, color_type *color_table, bool semantic) {
float base8_lab[8][3];
setup_256_palette_lab(ColorProfile *self, color_type *color_table, bool semantic, float base8_lab[8][3]) {
const color_type bg = colorprofile_to_color(self, self->overridden.default_bg, self->configured.default_bg).rgb;
const color_type fg = colorprofile_to_color(self, self->overridden.default_fg, self->configured.default_fg).rgb;
color_type_to_lab(bg, base8_lab[0]);
@ -197,6 +196,12 @@ generate_256_palette(ColorProfile *self, color_type *color_table, bool semantic)
memcpy(base8_lab[0], base8_lab[7], sizeof(tmp));
memcpy(base8_lab[7], tmp, sizeof(tmp));
}
}
static void
generate_256_palette(ColorProfile *self, color_type *color_table, bool semantic) {
float base8_lab[8][3];
setup_256_palette_lab(self, color_table, semantic, base8_lab);
int idx = 16;
for (int r = 0; r < 6; r++) {
@ -233,6 +238,31 @@ generate_256_palette(ColorProfile *self, color_type *color_table, bool semantic)
}
}
static color_type
generate_256_palette_color(ColorProfile *self, color_type *color_table, unsigned int idx, bool semantic) {
float base8_lab[8][3];
setup_256_palette_lab(self, color_table, semantic, base8_lab);
if (idx < 232) {
unsigned int i = idx - 16;
int r = i / 36, g = (i % 36) / 6, b = i % 6;
float c0[3], c1[3], c2[3], c3[3], c4[3], c5[3], c6[3];
lerp_lab(r / 5.0f, base8_lab[0], base8_lab[1], c0);
lerp_lab(r / 5.0f, base8_lab[2], base8_lab[3], c1);
lerp_lab(r / 5.0f, base8_lab[4], base8_lab[5], c2);
lerp_lab(r / 5.0f, base8_lab[6], base8_lab[7], c3);
lerp_lab(g / 5.0f, c0, c1, c4);
lerp_lab(g / 5.0f, c2, c3, c5);
lerp_lab(b / 5.0f, c4, c5, c6);
return lab_to_color_type(c6);
} else {
int i = idx - 232;
float lab[3];
lerp_lab((i + 1) / 25.0f, base8_lab[0], base8_lab[7], lab);
return lab_to_color_type(lab);
}
}
static void
fixed_color_palette(color_type *color_table) {
init_FG_BG_table();
@ -588,8 +618,10 @@ set_color(ColorProfile *self, PyObject *args) {
self->dirty = true;
if (val == NULL_COLOR_VALUE) {
bool semantic, dynamic = palette_generation_is_dynamic(global_state.options_object, &semantic);
if (dynamic) generate_256_palette(self, self->color_table, semantic);
else self->color_table[i] = FG_BG_256[i];
if (dynamic) {
if (i >= 16) self->color_table[i] = generate_256_palette_color(self, self->color_table, i, semantic);
else generate_256_palette(self, self->color_table, semantic);
} else self->color_table[i] = FG_BG_256[i];
}
Py_RETURN_NONE;
}