From 2f615468b68d49c8ec03ceffa751f8425d4c9b6b Mon Sep 17 00:00:00 2001 From: Simon Ser Date: Fri, 18 Jun 2021 12:15:08 +0200 Subject: backend: add output state allow-lists 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. --- backend/headless/output.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'backend/headless/output.c') diff --git a/backend/headless/output.c b/backend/headless/output.c index 2e4dee2d..9ec6ce50 100644 --- a/backend/headless/output.c +++ b/backend/headless/output.c @@ -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; } -- cgit v1.2.3