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sixel: application configurable palette size (color count)

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This implements the CSI escapes for retrieving and (re)setting the
palette size.
This commit is contained in:
Daniel Eklöf 2020-02-22 14:02:00 +01:00
parent 5e65db3b07
commit 8e37a18083
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GPG key ID: 5BBD4992C116573F
5 changed files with 73 additions and 6 deletions
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41
sixel.c
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@ -11,7 +11,6 @@
#define max(x, y) ((x) > (y) ? (x) : (y))
#define min(x, y) ((x) < (y) ? (x) : (y))
static const size_t COLOR_COUNT = 1024;
static size_t count;
@ -20,6 +19,7 @@ sixel_init(struct terminal *term)
{
assert(term->sixel.palette == NULL);
assert(term->sixel.image.data == NULL);
assert(term->sixel.palette_size <= SIXEL_MAX_COLORS);
term->sixel.state = SIXEL_DECSIXEL;
term->sixel.pos = (struct coord){0, 0};
@ -28,7 +28,7 @@ sixel_init(struct terminal *term)
term->sixel.param = 0;
term->sixel.param_idx = 0;
memset(term->sixel.params, 0, sizeof(term->sixel.params));
term->sixel.palette = calloc(COLOR_COUNT, sizeof(term->sixel.palette[0]));
term->sixel.palette = calloc(term->sixel.palette_size, sizeof(term->sixel.palette[0]));
term->sixel.image.data = malloc(1 * 6 * sizeof(term->sixel.image.data[0]));
term->sixel.image.width = 1;
term->sixel.image.height = 6;
@ -309,10 +309,8 @@ decgci(struct terminal *term, uint8_t c)
int nparams = term->sixel.param_idx;
if (nparams > 0) {
/* Add one, as we use idx==0 for background color (TODO) */
term->sixel.color_idx = min(1 + term->sixel.params[0], COLOR_COUNT - 1);
}
if (nparams > 0)
term->sixel.color_idx = min(term->sixel.params[0], term->sixel.palette_size - 1);
if (nparams > 4) {
unsigned format = term->sixel.params[1];
@ -360,3 +358,34 @@ sixel_put(struct terminal *term, uint8_t c)
count++;
}
void
sixel_colors_report_current(struct terminal *term)
{
char reply[24];
snprintf(reply, sizeof(reply), "\033[?1;0;%uS", term->sixel.palette_size);
term_to_slave(term, reply, strlen(reply));
}
void
sixel_colors_reset(struct terminal *term)
{
term->sixel.palette_size = SIXEL_MAX_COLORS;
LOG_DBG("sixel palette size reset to %u", SIXEL_MAX_COLORS);
}
void
sixel_colors_set(struct terminal *term, unsigned count)
{
unsigned new_palette_size = min(max(2, count), SIXEL_MAX_COLORS);
term->sixel.palette_size = new_palette_size;
LOG_DBG("sixel palette size set to %u", new_palette_size);
}
void
sixel_colors_report_max(struct terminal *term)
{
char reply[24];
snprintf(reply, sizeof(reply), "\033[?1;0;%uS", SIXEL_MAX_COLORS);
term_to_slave(term, reply, strlen(reply));
}