initial commit, 4.5 stable
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This commit is contained in:
143
thirdparty/sdl/events/SDL_eventwatch.c
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143
thirdparty/sdl/events/SDL_eventwatch.c
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#include "SDL_eventwatch_c.h"
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bool SDL_InitEventWatchList(SDL_EventWatchList *list)
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{
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if (list->lock == NULL) {
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list->lock = SDL_CreateMutex();
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if (list->lock == NULL) {
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return false;
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}
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}
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return true;
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}
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void SDL_QuitEventWatchList(SDL_EventWatchList *list)
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{
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if (list->lock) {
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SDL_DestroyMutex(list->lock);
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list->lock = NULL;
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}
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if (list->watchers) {
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SDL_free(list->watchers);
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list->watchers = NULL;
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list->count = 0;
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}
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SDL_zero(list->filter);
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}
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bool SDL_DispatchEventWatchList(SDL_EventWatchList *list, SDL_Event *event)
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{
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SDL_EventWatcher *filter = &list->filter;
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if (!filter->callback && list->count == 0) {
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return true;
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}
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SDL_LockMutex(list->lock);
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{
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// Make sure we only dispatch the current watcher list
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int i, count = list->count;
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if (filter->callback && !filter->callback(filter->userdata, event)) {
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SDL_UnlockMutex(list->lock);
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return false;
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}
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list->dispatching = true;
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for (i = 0; i < count; ++i) {
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if (!list->watchers[i].removed) {
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list->watchers[i].callback(list->watchers[i].userdata, event);
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}
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}
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list->dispatching = false;
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if (list->removed) {
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for (i = list->count; i--;) {
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if (list->watchers[i].removed) {
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--list->count;
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if (i < list->count) {
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SDL_memmove(&list->watchers[i], &list->watchers[i + 1], (list->count - i) * sizeof(list->watchers[i]));
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}
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}
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}
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list->removed = false;
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}
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}
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SDL_UnlockMutex(list->lock);
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return true;
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}
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bool SDL_AddEventWatchList(SDL_EventWatchList *list, SDL_EventFilter filter, void *userdata)
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{
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bool result = true;
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SDL_LockMutex(list->lock);
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{
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SDL_EventWatcher *watchers;
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watchers = (SDL_EventWatcher *)SDL_realloc(list->watchers, (list->count + 1) * sizeof(*watchers));
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if (watchers) {
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SDL_EventWatcher *watcher;
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list->watchers = watchers;
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watcher = &list->watchers[list->count];
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watcher->callback = filter;
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watcher->userdata = userdata;
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watcher->removed = false;
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++list->count;
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} else {
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result = false;
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}
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}
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SDL_UnlockMutex(list->lock);
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return result;
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}
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void SDL_RemoveEventWatchList(SDL_EventWatchList *list, SDL_EventFilter filter, void *userdata)
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{
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SDL_LockMutex(list->lock);
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{
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int i;
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for (i = 0; i < list->count; ++i) {
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if (list->watchers[i].callback == filter && list->watchers[i].userdata == userdata) {
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if (list->dispatching) {
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list->watchers[i].removed = true;
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list->removed = true;
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} else {
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--list->count;
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if (i < list->count) {
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SDL_memmove(&list->watchers[i], &list->watchers[i + 1], (list->count - i) * sizeof(list->watchers[i]));
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}
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}
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break;
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}
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}
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}
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SDL_UnlockMutex(list->lock);
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}
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