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108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "applib/app_logging.h"
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#include "applib/tick_timer_service_private.h"
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#include <emscripten/emscripten.h>
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#include <stdio.h>
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#include <time.h>
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time_t time(time_t *time);
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static TickTimerServiceState s_state;
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static void prv_schedule_next_update(void);
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static void prv_do_update(void *data) {
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if (!s_state.handler) {
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return;
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}
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// The data pointer value is used to pass a boolean value directly:
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const bool is_update_due_to_time_change = (uintptr_t)data;
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struct tm currtime;
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time_t t = time(NULL);
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localtime_r(&t, &currtime);
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TimeUnits units_changed;
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if (is_update_due_to_time_change) {
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units_changed = (SECOND_UNIT | MINUTE_UNIT | HOUR_UNIT | DAY_UNIT | YEAR_UNIT);
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} else {
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prv_schedule_next_update();
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units_changed = 0;
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if (!s_state.first_tick) {
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if (s_state.last_time.tm_sec != currtime.tm_sec) {
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units_changed |= SECOND_UNIT;
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}
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if (s_state.last_time.tm_min != currtime.tm_min) {
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units_changed |= MINUTE_UNIT;
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}
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if (s_state.last_time.tm_hour != currtime.tm_hour) {
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units_changed |= HOUR_UNIT;
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}
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if (s_state.last_time.tm_mday != currtime.tm_mday) {
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units_changed |= DAY_UNIT;
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}
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if (s_state.last_time.tm_mon != currtime.tm_mon) {
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units_changed |= MONTH_UNIT;
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}
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if (s_state.last_time.tm_year != currtime.tm_year) {
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units_changed |= YEAR_UNIT;
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}
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}
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}
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s_state.last_time = currtime;
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s_state.first_tick = false;
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if ((s_state.tick_units & units_changed) || (units_changed == 0)) {
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s_state.handler(&currtime, units_changed);
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}
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}
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static void prv_schedule_next_update(void) {
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// Schedule this to fire again at the top of the next second
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const int ms_into_s = EM_ASM_INT_V({
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return Date.now().getMilliseconds;
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});
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const double wait_ms = 1000 - ms_into_s;
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const bool is_update_due_to_time_change = false;
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emscripten_async_call(prv_do_update, (void *)(uintptr_t)is_update_due_to_time_change, wait_ms);
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}
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void tick_timer_service_handle_time_change(void) {
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const bool is_update_due_to_time_change = true;
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prv_do_update((void *)(uintptr_t)is_update_due_to_time_change);
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}
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void tick_timer_service_subscribe(TimeUnits tick_units, TickHandler handler) {
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const bool first = (s_state.handler == NULL);
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s_state = (TickTimerServiceState) {
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.handler = handler,
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.tick_units = tick_units,
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.first_tick = true,
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};
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if (first && handler != NULL) {
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prv_schedule_next_update();
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}
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}
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void emx_tick_timer_service_init(void) {
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s_state = (TickTimerServiceState){};
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}
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