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SIXEL draw bits.

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This commit is contained in:
Nicholas Marriott
2026-10-14 11:40:55 +01:00
parent 464f404b85
commit 1e294b175f
4 changed files with 141 additions and 2 deletions
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68
image-grid.c
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@@ -88,6 +88,9 @@ struct image_backend {
const char *name;
int flags;
int (*select)(struct tty *);
const struct grid_cell *(*map_cell)(struct tty *, struct grid *, u_int,
u_int, const struct grid_cell *, struct grid_cell *,
int *);
void (*draw_rect)(struct tty *, struct image_rect *);
void (*start_draw)(struct tty *, u_int, u_int, u_int, u_int);
void (*flush)(struct tty *);
@@ -99,6 +102,7 @@ static struct image_backend image_backend_fallback = {
"fallback",
IMAGE_BACKEND_SCROLLS,
fallback_select,
fallback_map_cell,
NULL,
NULL,
NULL,
@@ -108,6 +112,7 @@ static struct image_backend image_backend_sixel = {
"sixel",
IMAGE_BACKEND_GRAPHICAL,
sixel_select,
NULL,
sixel_draw_rect,
sixel_start_draw,
sixel_flush_pending,
@@ -142,6 +147,69 @@ image_tty_update(struct tty *tty)
return (1);
}
/* Map an image grid cell to text for the selected backend. */
const struct grid_cell *
image_map_cell(struct tty *tty, struct grid *gd, u_int x, u_int y,
const struct grid_cell *gc, struct grid_cell *out, int *empty)
{
image_tty_update(tty);
if (tty->image_backend->map_cell == NULL)
return (gc);
return (tty->image_backend->map_cell(tty, gd, x, y, gc, out, empty));
}
/* Draw a clipped part of one image span. */
static void
image_draw_span(struct image_backend *backend, struct tty *tty,
struct image_span *span, u_int start, u_int end, u_int px, u_int atx,
u_int aty)
{
struct image_rect rect;
rect.image = span->placement->image;
rect.src_x = span->source_x + start - span->x;
rect.src_y = span->source_y;
rect.sx = end - start;
rect.sy = 1;
rect.dst_x = atx + start - px;
rect.dst_y = aty;
backend->draw_rect(tty, &rect);
}
/* Draw images in the visible part of one screen line. */
void
image_draw_line(struct tty *tty, struct screen *s, u_int px, u_int py,
u_int nx, u_int atx, u_int aty)
{
struct image_backend *backend;
struct image_line *line;
struct image_span *span;
u_int start, end, span_end;
image_tty_update(tty);
backend = tty->image_backend;
if (backend->draw_rect == NULL)
return;
if (py >= s->grid->sy)
return;
line = s->grid->linedata[s->grid->hsize + py].images;
if (line == NULL)
return;
end = px + nx;
TAILQ_FOREACH(span, &line->spans, line_entry) {
span_end = span->x + span->sx;
start = span->x;
if (start < px)
start = px;
if (start >= end || span_end <= px)
continue;
if (span_end > end)
span_end = end;
image_draw_span(backend, tty, span, start, span_end, px, atx,
aty);
}
}
/* Clear old image pixels before redrawing a terminal area. */
void
image_redraw_start(struct tty *tty, u_int x, u_int y, u_int w, u_int h)