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sixel: pre-calculate color before calling sixel_add()

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This improves performance of DECGRI, since we now only need to
calculate the color once for the entire repeat sequence.
This commit is contained in:
Daniel Eklöf 2021-03-06 19:49:04 +01:00
parent 47e4cfbf5c
commit 869743060e
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GPG key ID: 5BBD4992C116573F
1 changed files with 11 additions and 3 deletions
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14
sixel.c
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@ -926,7 +926,7 @@ sixel_add(struct terminal *term, uint32_t color, uint8_t sixel)
for (int i = 0; i < 6; i++, sixel >>= 1) {
if (sixel & 1)
term->sixel.image.data[ofs] = color_with_alpha(term, color);
term->sixel.image.data[ofs] = color;
ofs += term->sixel.image.width;
}
@ -980,7 +980,11 @@ decsixel(struct terminal *term, uint8_t c)
case 'p': case 'q': case 'r': case 's': case 't': case 'u': case 'v':
case 'w': case 'x': case 'y': case 'z': case '{': case '|': case '}':
case '~':
sixel_add(term, term->sixel.palette[term->sixel.color_idx], c - 63);
sixel_add(
term,
color_with_alpha(
term, term->sixel.palette[term->sixel.color_idx]),
c - 63);
break;
case ' ':
@ -1060,8 +1064,12 @@ decgri(struct terminal *term, uint8_t c)
case 'w': case 'x': case 'y': case 'z': case '{': case '|': case '}':
case '~': {
//LOG_DBG("repeating '%c' %u times", c, term->sixel.param);
uint32_t color = color_with_alpha(
term, term->sixel.palette[term->sixel.color_idx]);
for (unsigned i = 0; i < term->sixel.param; i++)
decsixel(term, c);
sixel_add(term, color, c - 63);
term->sixel.state = SIXEL_DECSIXEL;
break;
}