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Implement generalised image support

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Support Kitty and SIXEL input and output with grid-resident image layers, history and copy-mode integration, text fallback rendering, and damage-rectangle redraws.

Consolidate the image work through 250f96b4b onto the redraw-damage-rectangles-new base, excluding the superseded redraw implementation and its historical merges. The original history is preserved in backup/4902-image-support-before-master-rebase-20261003.
This commit is contained in:
Michael Grant
2026-10-03 22:46:01 +01:00
parent 9286115b43
commit cfd1b81dc7
44 changed files with 7586 additions and 677 deletions
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67
tty-acs.c
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@@ -64,9 +64,65 @@ static const struct tty_acs_entry tty_acs_table[] = {
{ '{', "\317\200" }, /* greek pi */
{ '|', "\342\211\240" }, /* not-equal */
{ '}', "\302\243" }, /* UK pound sign */
{ '~', "\302\267" } /* bullet */
{ '~', "\302\267" }, /* bullet */
#ifdef ENABLE_IMAGES
{ TTY_ACS_IMAGE_SHADE_LIGHT, "\342\226\221" },
{ TTY_ACS_IMAGE_SHADE_MEDIUM, "\342\226\222" },
{ TTY_ACS_IMAGE_SHADE_DARK, "\342\226\223" },
{ TTY_ACS_IMAGE_BLOCK, "\342\226\210" },
{ TTY_ACS_IMAGE_HALF_UPPER, "\342\226\200" },
{ TTY_ACS_IMAGE_HALF_LOWER, "\342\226\204" },
{ TTY_ACS_IMAGE_HALF_LEFT, "\342\226\214" },
{ TTY_ACS_IMAGE_HALF_RIGHT, "\342\226\220" },
{ TTY_ACS_IMAGE_QUADRANT_LOWER_LEFT, "\342\226\226" },
{ TTY_ACS_IMAGE_QUADRANT_LOWER_RIGHT, "\342\226\227" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_LEFT, "\342\226\230" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_LEFT_LOWER_LEFT_LOWER_RIGHT,
"\342\226\231" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_LEFT_LOWER_RIGHT, "\342\226\232" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_LEFT_UPPER_RIGHT_LOWER_LEFT,
"\342\226\233" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_LEFT_UPPER_RIGHT_LOWER_RIGHT,
"\342\226\234" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_RIGHT, "\342\226\235" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_RIGHT_LOWER_LEFT, "\342\226\236" },
{ TTY_ACS_IMAGE_QUADRANT_UPPER_RIGHT_LOWER_LEFT_LOWER_RIGHT,
"\342\226\237" }
#endif
};
#ifdef ENABLE_IMAGES
static char tty_acs_image_sextants[60][5];
static void
tty_acs_image_sextants_init(void)
{
u_int cp, i;
if (tty_acs_image_sextants[0][0] != '\0')
return;
for (i = 0; i < nitems(tty_acs_image_sextants); i++) {
cp = 0x1fb00 + i;
tty_acs_image_sextants[i][0] = 0xf0 | (cp >> 18);
tty_acs_image_sextants[i][1] = 0x80 | ((cp >> 12) & 0x3f);
tty_acs_image_sextants[i][2] = 0x80 | ((cp >> 6) & 0x3f);
tty_acs_image_sextants[i][3] = 0x80 | (cp & 0x3f);
}
}
u_char
tty_acs_image_sextant(u_int mask)
{
if (mask == 0 || mask == 21 || mask == 42 || mask >= 63)
return (0);
if (mask < 21)
return (TTY_ACS_IMAGE_SEXTANT_FIRST + mask - 1);
if (mask < 42)
return (TTY_ACS_IMAGE_SEXTANT_FIRST + mask - 2);
return (TTY_ACS_IMAGE_SEXTANT_FIRST + mask - 3);
}
#endif
/* Table mapping UTF-8 to ACS entries. */
struct tty_acs_reverse_entry {
const char *string;
@@ -239,6 +295,15 @@ tty_acs_get(struct tty *tty, u_char ch)
return (&tty->term->acs[ch][0]);
}
#ifdef ENABLE_IMAGES
if (ch >= TTY_ACS_IMAGE_SEXTANT_FIRST &&
ch <= TTY_ACS_IMAGE_SEXTANT_LAST) {
tty_acs_image_sextants_init();
return (tty_acs_image_sextants[
ch - TTY_ACS_IMAGE_SEXTANT_FIRST]);
}
#endif
/* Otherwise look up the UTF-8 translation. */
entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
sizeof tty_acs_table[0], tty_acs_cmp);