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output-management-v1: add wlr_output_configuration_v1_build_state()

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A convenience function to make it easier for compositors to
implement the protocol.
This commit is contained in:
Simon Ser 2022-09-14 11:56:01 +02:00 committed by Kenny Levinsen
parent 917c650903
commit 2ff3479558
2 changed files with 35 additions and 0 deletions
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12
include/wlr/types/wlr_output_management_v1.h
View file

@ -154,4 +154,16 @@ void wlr_output_head_v1_state_apply(
const struct wlr_output_head_v1_state *head_state,
struct wlr_output_state *output_state);
/**
* Build an array of struct wlr_output_state reflecting the new configuration.
*
* The states_len pointer will be populated with the number of elements in the
* array. The caller is responsible for freeing the array.
*
* The returned array can be passed to wlr_backend_test() and
* wlr_backend_commit().
*/
struct wlr_backend_output_state *wlr_output_configuration_v1_build_state(
const struct wlr_output_configuration_v1 *config, size_t *states_len);
#endif

23
types/wlr_output_management_v1.c
View file

@ -1,6 +1,7 @@
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <wlr/backend.h>
#include <wlr/types/wlr_output_management_v1.h>
#include <wlr/util/log.h>
#include "wlr-output-management-unstable-v1-protocol.h"
@ -1027,3 +1028,25 @@ void wlr_output_head_v1_state_apply(
wlr_output_state_set_adaptive_sync_enabled(output_state,
head_state->adaptive_sync_enabled);
}
struct wlr_backend_output_state *wlr_output_configuration_v1_build_state(
const struct wlr_output_configuration_v1 *config, size_t *states_len) {
*states_len = wl_list_length(&config->heads);
struct wlr_backend_output_state *states = calloc(*states_len, sizeof(states[0]));
if (states == NULL) {
return NULL;
}
size_t i = 0;
const struct wlr_output_configuration_head_v1 *config_head;
wl_list_for_each(config_head, &config->heads, link) {
struct wlr_backend_output_state *state = &states[i];
i++;
state->output = config_head->state.output;
wlr_output_state_init(&state->base);
wlr_output_head_v1_state_apply(&config_head->state, &state->base);
}
return states;
}