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sixel: reflow: drop sixels that crosses the scrollback history’s end

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This fixes various crashes that occurred after a reflow due to the
sixel image list invariants no longer being true.
This commit is contained in:
Daniel Eklöf 2020-10-05 18:33:50 +02:00
parent d54adc5263
commit d0c5cf6e9f
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1 changed files with 23 additions and 0 deletions
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sixel.c
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@ -643,6 +643,29 @@ sixel_reflow(struct terminal *term)
continue;
}
/* Drop sixels that now cross the current scrollback end
* border. This is similar to a sixel that have been
* scrolled out */
/* TODO: should be possible to optimize this */
bool sixel_destroyed = false;
int last_row = -1;
for (int j = 0; j < six->rows; j++) {
int row_no = rebase_row(term, six->pos.row + j);
if (last_row != -1 && last_row >= row_no) {
sixel_destroy(six);
sixel_destroyed = true;
break;
}
last_row = row_no;
}
if (sixel_destroyed) {
LOG_WARN("destroyed sixel that now crossed history");
continue;
}
/* Sixels that didn’t overlap may now do so, which isn’t
* allowed of course */
_sixel_overwrite_by_rectangle(