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sixel: fix hls-to-rgb and color count issues (#185)

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This fixes the following sixel issues:

- The HLS to RGB color conversion is broken.
  Ref. d4ade1fe3c

- Not enough color registers have been allocated for 1024 colors.
  Ref. 97f93e8436
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veltza 2026-01-15 12:11:04 +02:00 • committed by GitHub
parent 37bc089f1d
commit 490d2440da
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3 changed files with 25 additions and 20 deletions
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7
sixel.c
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@ -100,9 +100,13 @@ set_default_color(sixel_image_t *image)
image->palette[n++] = SIXEL_RGB(i * 11, i * 11, i * 11);
}
/* sixels rarely use more than 256 colors and if they do, they use a custom
* palette, so we don't need to initialize these colors */
/*
for (; n < DECSIXEL_PALETTE_MAX; n++) {
image->palette[n] = SIXEL_RGB(255, 255, 255);
}
*/
return (0);
}
@ -610,11 +614,12 @@ sixel_parser_parse(sixel_state_t *st, const unsigned char *p, size_t len)
st->param = 0;
if (st->nparams > 0) {
st->color_index = 1 + st->params[0]; /* offset 1(background color) added */
st->color_index = st->params[0];
if (st->color_index < 0)
st->color_index = 0;
else if (st->color_index >= DECSIXEL_PALETTE_MAX)
st->color_index = DECSIXEL_PALETTE_MAX - 1;
st->color_index++; /* offset by 1 (background) */
}
if (st->nparams > 4) {