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sixel: ovewrite-by-rectangle: in debug builds, cross-reference against pixman

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Use pixman to calculate the intersection of the rectangle being
overwritten, and the sixel(s). Verify our code matches.
This commit is contained in:
Daniel Eklöf 2020-10-05 18:30:23 +02:00
parent 5ebab9dea9
commit 91c0aed26e
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GPG key ID: 5BBD4992C116573F
1 changed files with 38 additions and 2 deletions
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40
sixel.c
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@ -427,6 +427,13 @@ static void
_sixel_overwrite_by_rectangle(
struct terminal *term, int row, int col, int height, int width)
{
verify_sixels(term);
#if defined(_DEBUG)
pixman_region32_t overwrite_rect;
pixman_region32_init_rect(&overwrite_rect, col, row, width, height);
#endif
const int start = row;
const int end = row + height - 1;
@ -435,6 +442,8 @@ _sixel_overwrite_by_rectangle(
const int scrollback_rel_start = rebase_row(term, start);
bool UNUSED would_have_breaked = false;
tll_foreach(term->grid->sixel_images, it) {
struct sixel *six = &it->item;
@ -447,9 +456,23 @@ _sixel_overwrite_by_rectangle(
if (six_scrollback_rel_end < scrollback_rel_start) {
/* All remaining sixels are *before* our rectangle */
would_have_breaked = true;
break;
}
#if defined(_DEBUG)
pixman_region32_t six_rect;
pixman_region32_init_rect(&six_rect, six->pos.col, six->pos.row, six->cols, six->rows);
pixman_region32_t intersection;
pixman_region32_init(&intersection);
pixman_region32_intersect(&intersection, &six_rect, &overwrite_rect);
const bool collides = pixman_region32_not_empty(&intersection);
#else
const bool UNUSED collides = false;
#endif
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 */
@ -461,14 +484,27 @@ _sixel_overwrite_by_rectangle(
(col <= col_end && col + width - 1 >= col_end) ||
(col >= col_start && col + width - 1 <= col_end))
{
assert(!would_have_breaked);
struct sixel to_be_erased = *six;
tll_remove(term->grid->sixel_images, it);
sixel_overwrite(term, &to_be_erased, start, col, height, width);
sixel_erase(term, &to_be_erased);
}
}
} else
assert(!collides);
} else
assert(!collides);
#if defined(_DEBUG)
pixman_region32_fini(&intersection);
pixman_region32_fini(&six_rect);
#endif
}
#if defined(_DEBUG)
pixman_region32_fini(&overwrite_rect);
#endif
}
void