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render: add code that calculates current position in scrollback

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Daniel Eklöf 2020-07-24 17:51:40 +02:00
parent c50a442810
commit b1950ac222
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1 changed files with 46 additions and 0 deletions
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46
render.c
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@ -1287,6 +1287,50 @@ render_csd(struct terminal *term)
render_csd_title(term);
}
static void
render_scrollback_position(struct terminal *term)
{
#if 0
if (!term->conf->show_scrollback_position)
return;
#endif
/* Find absolute row number of the scrollback start */
int scrollback_start = term->grid->offset + term->rows;
while (term->grid->rows[scrollback_start & (term->grid->num_rows - 1)] == NULL)
scrollback_start++;
/* Rebase viewport against scrollback start (so that 0 is at
* the beginning of the scrollback) */
int rebased_view = term->grid->view - scrollback_start + term->grid->num_rows;
rebased_view &= term->grid->num_rows - 1;
/*
* How far down in the scrollback we are.
*
* 0% -> at the beginning of the scrollback
* 100% -> at the bottom, i.e. where new lines are inserted
*/
int percentage __attribute__((unused)) =
rebased_view + term->rows == term->grid->num_rows
? 100
: 100 * rebased_view / term->grid->num_rows;
int next_row_no = term->grid->view + term->rows;
next_row_no &= term->grid->num_rows - 1;
/* Are we at the end of the scrollback? */
bool at_bottom = rebased_view + term->rows == term->grid->num_rows ||
term->grid->rows[next_row_no] == NULL;
LOG_DBG("scrollback position: %d/%d (%d%%), at-bottom: %d",
rebased_view, term->grid->num_rows, percentage, at_bottom);
if (!at_bottom) {
/* TODO: insert rendering code here */
}
}
static void frame_callback(
void *data, struct wl_callback *wl_callback, uint32_t callback_data);
@ -1498,6 +1542,8 @@ grid_render(struct terminal *term)
term->window->surface, 0, 0, term->width, term->height);
}
render_scrollback_position(term);
assert(term->grid->offset >= 0 && term->grid->offset < term->grid->num_rows);
assert(term->grid->view >= 0 && term->grid->view < term->grid->num_rows);