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Three SIXEL improvements from nincsnevem662 at gmail dot com in GitHub issue

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4149:

- Pass P2 on the received image through when forwarding the image to the
  outside terminal to preserve transparency;

- Preserve raster attribute dimensions which may be smaller than the actual
  image (used to crop out parts of the image to work around the limitation that
  rows must come in groups of six);

- To avoid collapsing empty sixel lines, no longer ignore duplicate "-" new
  line specifiers.
This commit is contained in:
Nicholas Marriott
2024-10-04 07:49:07 +01:00
parent 2df15ad08c
commit 7a78cdf78c
3 changed files with 39 additions and 8 deletions
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37
image-sixel.c
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@ -37,8 +37,13 @@ struct sixel_image {
u_int xpixel;
u_int ypixel;
u_int set_ra;
u_int ra_x;
u_int ra_y;
u_int *colours;
u_int ncolours;
u_int p2;
u_int dx;
u_int dy;
@ -166,6 +171,10 @@ sixel_parse_attributes(struct sixel_image *si, const char *cp, const char *end)
si->x = x;
sixel_parse_expand_lines(si, y);
si->set_ra = 1;
si->ra_x = x;
si->ra_y = y;
return (last);
}
@ -268,7 +277,7 @@ sixel_parse_repeat(struct sixel_image *si, const char *cp, const char *end)
}
struct sixel_image *
sixel_parse(const char *buf, size_t len, u_int xpixel, u_int ypixel)
sixel_parse(const char *buf, size_t len, u_int p2, u_int xpixel, u_int ypixel)
{
struct sixel_image *si;
const char *cp = buf, *end = buf + len;
@ -282,6 +291,7 @@ sixel_parse(const char *buf, size_t len, u_int xpixel, u_int ypixel)
si = xcalloc (1, sizeof *si);
si->xpixel = xpixel;
si->ypixel = ypixel;
si->p2 = p2;
while (cp != end) {
ch = *cp++;
@ -423,6 +433,18 @@ sixel_scale(struct sixel_image *si, u_int xpixel, u_int ypixel, u_int ox,
new = xcalloc (1, sizeof *si);
new->xpixel = xpixel;
new->ypixel = ypixel;
new->p2 = si->p2;
new->set_ra = si->set_ra;
/* clamp to slice end */
new->ra_x = si->ra_x < psx ? si->ra_x : psx;
new->ra_y = si->ra_y < psy ? si->ra_y : psy;
/* subtract slice origin */
new->ra_x = new->ra_x > pox ? new->ra_x - pox : 0;
new->ra_y = new->ra_y > poy ? new->ra_y - poy : 0;
/* resize */
new->ra_x = new->ra_x * xpixel / si->xpixel;
new->ra_y = new->ra_y * ypixel / si->ypixel;
for (y = 0; y < tsy; y++) {
py = poy + ((double)y * psy / tsy);
@ -497,11 +519,15 @@ sixel_print(struct sixel_image *si, struct sixel_image *map, size_t *size)
len = 8192;
buf = xmalloc(len);
sixel_print_add(&buf, &len, &used, "\033Pq", 3);
tmplen = xsnprintf(tmp, sizeof tmp, "\"1;1;%u;%u", si->x, si->y);
tmplen = xsnprintf(tmp, sizeof tmp, "\033P0;%uq", si->p2);
sixel_print_add(&buf, &len, &used, tmp, tmplen);
if (si->set_ra) {
tmplen = xsnprintf(tmp, sizeof tmp, "\"1;1;%u;%u", si->ra_x,
si->ra_y);
sixel_print_add(&buf, &len, &used, tmp, tmplen);
}
for (i = 0; i < ncolours; i++) {
c = colours[i];
tmplen = xsnprintf(tmp, sizeof tmp, "#%u;%u;%u;%u;%u",
@ -552,8 +578,7 @@ sixel_print(struct sixel_image *si, struct sixel_image *map, size_t *size)
if (buf[used - 1] == '$')
used--;
if (buf[used - 1] != '-')
sixel_print_add(&buf, &len, &used, "-", 1);
sixel_print_add(&buf, &len, &used, "-", 1);
}
if (buf[used - 1] == '$' || buf[used - 1] == '-')
used--;