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backend: add output state allow-lists

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Right now, when a new output state field is added, all backends by
default won't reject it. This means we need to add new checks to
each and every backend when we introduce a new state field.

Instead, introduce a bitmask of supported output state fields in
each backend, and error out if the user has submitted an unknown
field.

Some fields don't need any backend involvment to work. These are
listed in WLR_OUTPUT_STATE_BACKEND_OPTIONAL as a convenience.
This commit is contained in:
Simon Ser 2021-06-18 12:15:08 +02:00 • committed by Kenny Levinsen
parent 15c8453ba1
commit 2f615468b6
6 changed files with 63 additions and 8 deletions
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12
backend/headless/output.c
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@ -7,6 +7,11 @@
#include "backend/headless.h"
#include "util/signal.h"
static const uint32_t SUPPORTED_OUTPUT_STATE =
WLR_OUTPUT_STATE_BACKEND_OPTIONAL |
WLR_OUTPUT_STATE_BUFFER |
WLR_OUTPUT_STATE_MODE;
static struct wlr_headless_output *headless_output_from_output(
struct wlr_output *wlr_output) {
assert(wlr_output_is_headless(wlr_output));
@ -29,8 +34,11 @@ static bool output_set_custom_mode(struct wlr_output *wlr_output, int32_t width,
}
static bool output_test(struct wlr_output *wlr_output) {
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_ENABLED) {
wlr_log(WLR_DEBUG, "Cannot disable a headless output");
uint32_t unsupported =
wlr_output->pending.committed & ~SUPPORTED_OUTPUT_STATE;
if (unsupported != 0) {
wlr_log(WLR_DEBUG, "Unsupported output state fields: 0x%"PRIx32,
unsupported);
return false;
}