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backend/multi: Advance index on backend_commit

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wlr_multi_backend sorts the states it is given and tries to perform
sequential backend-wide commits for each sub-backend with the states
that belong to it.

It did not manage the index correctly for the next iteration, so given N
states for a backend it would perform N backend-wide commits.

Clarify the logic by calculating a length rather than an end pointer and
update the index after each iteration.
This commit is contained in:
Kenny Levinsen 2024-10-15 17:06:32 +02:00
parent 7952658367
commit ba0cc8eb05
1 changed files with 8 additions and 6 deletions
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14
backend/multi/backend.c
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@ -126,22 +126,24 @@ static bool commit(struct wlr_backend *backend,
qsort(by_backend, states_len, sizeof(by_backend[0]), compare_output_state_backend);
bool ok = true;
for (size_t i = 0; i < states_len; i++) {
for (size_t i = 0; i < states_len;) {
struct wlr_backend *sub = by_backend[i].output->backend;
size_t j = i;
while (j < states_len && by_backend[j].output->backend == sub) {
j++;
size_t len = 1;
while (i + len < states_len &&
by_backend[i + len].output->backend == sub) {
len++;
}
if (test_only) {
ok = wlr_backend_test(sub, &by_backend[i], j - i);
ok = wlr_backend_test(sub, &by_backend[i], len);
} else {
ok = wlr_backend_commit(sub, &by_backend[i], j - i);
ok = wlr_backend_commit(sub, &by_backend[i], len);
}
if (!ok) {
break;
}
i += len;
}
free(by_backend);