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Some of SIXEL output path.

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This commit is contained in:
Nicholas Marriott
2026-10-14 11:04:00 +01:00
parent 9a37890133
commit d68e56f130
7 changed files with 307 additions and 9 deletions
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106
image-grid.c
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@@ -83,6 +83,105 @@ struct image_recover_row {
u_int source_y;
};
/* A backend to draw an image. */
struct image_backend {
const char *name;
int flags;
int (*select)(struct tty *);
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 *);
void (*free)(struct tty *);
};
/* Backend definitions. */
static struct image_backend image_backend_fallback = {
"fallback",
IMAGE_BACKEND_SCROLLS,
fallback_select,
NULL,
NULL,
NULL,
NULL
};
static struct image_backend image_backend_sixel = {
"sixel",
IMAGE_BACKEND_GRAPHICAL,
sixel_select,
sixel_draw_rect,
sixel_start_draw,
sixel_flush_pending,
sixel_free_pending
};
/* Backends in order of preference. */
static struct image_backend *image_backends[] = {
&image_backend_sixel,
&image_backend_fallback
};
/* Update the image backend. */
int
image_tty_update(struct tty *tty)
{
struct image_backend *backend;
u_int i;
for (i = 0; i < nitems(image_backends); i++) {
backend = image_backends[i];
if (backend->select(tty))
break;
}
if (tty->image_backend == backend)
return (0);
if (tty->image_backend != NULL && tty->image_backend->free != NULL)
tty->image_backend->free(tty);
tty->image_data = NULL;
tty->image_backend = backend;
return (1);
}
/* 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)
{
image_tty_update(tty);
if (tty->image_backend->start_draw != NULL)
tty->image_backend->start_draw(tty, x, y, w, h);
}
/* Write pending image output to the terminal. */
void
image_draw_flush(struct tty *tty)
{
image_tty_update(tty);
if (tty->image_backend->flush != NULL)
tty->image_backend->flush(tty);
}
/* Discard image backend state after a terminal size change. */
void
image_tty_size_changed(struct tty *tty)
{
if (!image_tty_update(tty)) {
if (tty->image_backend->free != NULL)
tty->image_backend->free(tty);
}
}
/* Free image backend state for a terminal. */
void
image_tty_free(struct tty *tty)
{
if (tty->image_backend != NULL) {
if (tty->image_backend->free != NULL)
tty->image_backend->free(tty);
tty->image_backend = NULL;
tty->image_data = NULL;
}
}
/* Get the placement store for a grid. */
static struct image_store *
image_store_get(struct grid *gd)
@@ -401,6 +500,7 @@ image_grid_copy_area(struct grid *dst, u_int dx, u_int dy, struct grid *src,
struct image_copy_map *maps = NULL;
struct image_placement *plmt;
struct image_line *src_line, *dst_line;
struct grid_line *gl;
struct image_span *span;
u_int nmaps = 0, row, start, end, span_end;
@@ -428,8 +528,10 @@ image_grid_copy_area(struct grid *dst, u_int dx, u_int dy, struct grid *src,
continue;
if (span_end > end)
span_end = end;
if (dst_line == NULL)
dst_line = image_line_get(&dst->linedata[dy + row]);
if (dst_line == NULL) {
gl = &dst->linedata[dy + row];
dst_line = image_line_get(gl);
}
plmt = image_copy_placement(dst, span->placement, &maps,
&nmaps);
plmt->recover_from = 0;