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sixel: add sixel_delete_at_row and sixel_delete_in_range

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These are utility functions to erase sixel images that are at the
specified row, or in a row range.
This commit is contained in:
Daniel Eklöf 2020-02-24 18:39:14 +01:00
parent d804bc8579
commit 95f7c5586c
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GPG key ID: 5BBD4992C116573F
2 changed files with 69 additions and 8 deletions
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74
sixel.c
View file

@ -52,25 +52,83 @@ sixel_destroy(struct sixel *sixel)
sixel->data = NULL;
}
void
sixel_delete_at_cursor(struct terminal *term)
static void
sixel_erase(struct terminal *term, struct sixel *sixel)
{
const int row = term->grid->offset + term->cursor.point.row;
for (int i = 0; i < sixel->rows; i++) {
int r = (sixel->pos.row + i) & (term->grid->num_rows - 1);
struct row *row = term->grid->rows[r];
row->dirty = true;
for (int c = 0; c < term->grid->num_cols; c++)
row->cells[c].attrs.clean = 0;
}
sixel_destroy(sixel);
}
void
sixel_delete_at_row(struct terminal *term, int _row)
{
if (likely(tll_length(term->sixel_images) == 0))
return;
tll_foreach(term->sixel_images, it) {
if (it->item.grid != term->grid)
struct sixel *six = &it->item;
if (six->grid != term->grid)
continue;
const int start = it->item.pos.row;
const int end = start + it->item.rows;
const int row = (term->grid->offset + _row) & (term->grid->num_rows - 1);
const int six_start = six->pos.row;
const int six_end = six_start + six->rows - 1;
if (row >= start && row < end) {
sixel_destroy(&it->item);
if (row >= six_start && row <= six_end) {
sixel_erase(term, six);
tll_remove(term->sixel_images, it);
}
}
}
void
sixel_delete_in_range(struct terminal *term, int _start, int _end)
{
assert(_end >= _start);
if (likely(tll_length(term->sixel_images) == 0))
return;
if (_start == _end)
return sixel_delete_at_row(term, _start);
tll_foreach(term->sixel_images, it) {
struct sixel *six = &it->item;
if (six->grid != term->grid)
continue;
const int start = (term->grid->offset + _start) & (term->grid->num_rows - 1);
const int end = start + (_end - _start);
const int six_start = six->pos.row;
const int six_end = six_start + six->rows - 1;
if ((start <= six_start && end >= six_start) || /* Crosses sixel start boundary */
(start <= six_end && end >= six_end) || /* Crosses sixel end boundary */
(start >= six_start && end <= six_end)) /* Fully within sixel range */
{
sixel_erase(term, six);
tll_remove(term->sixel_images, it);
}
}
}
void
sixel_delete_at_cursor(struct terminal *term)
{
sixel_delete_at_row(term, term->cursor.point.row);
}
void
sixel_unhook(struct terminal *term)
{

3
sixel.h
View file

@ -9,6 +9,9 @@ void sixel_put(struct terminal *term, uint8_t c);
void sixel_unhook(struct terminal *term);
void sixel_destroy(struct sixel *sixel);
void sixel_delete_in_range(struct terminal *term, int start, int end);
void sixel_delete_at_row(struct terminal *term, int _row);
void sixel_delete_at_cursor(struct terminal *term);
void sixel_colors_report_current(struct terminal *term);