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Set the hint value before calling hint callbacks

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This allows the hint callbacks to perform more complicated logic involving multiple hints without worrying about which hint has been changed.
This commit is contained in:
Sam Lantinga 2023-06-28 08:53:48 -07:00
parent ad12bb4fd1
commit e643d28d9c
2 changed files with 9 additions and 3 deletions
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2
docs/README-migration.md
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@ -386,6 +386,8 @@ functionality to your app and aid migration. That is located in the
SDL_AddHintCallback() now returns a standard int result instead of void, returning 0 if the function succeeds or a negative error code if there was an error.
Calling SDL_GetHint() with the name of the hint being changed from within a hint callback will now return the new value rather than the old value. The old value is still passed as a parameter to the hint callback.
The following hints have been removed:
* SDL_HINT_VIDEO_HIGHDPI_DISABLED - high DPI support is always enabled
* SDL_HINT_IDLE_TIMER_DISABLED - use SDL_DisableScreenSaver instead

10
src/SDL_hints.c
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@ -65,14 +65,18 @@ SDL_bool SDL_SetHintWithPriority(const char *name, const char *value, SDL_HintPr
}
if (hint->value != value &&
(value == NULL || !hint->value || SDL_strcmp(hint->value, value) != 0)) {
char *old_value = hint->value;
hint->value = value ? SDL_strdup(value) : NULL;
for (entry = hint->callbacks; entry;) {
/* Save the next entry in case this one is deleted */
SDL_HintWatch *next = entry->next;
entry->callback(entry->userdata, name, hint->value, value);
entry->callback(entry->userdata, name, old_value, value);
entry = next;
}
SDL_free(hint->value);
hint->value = value ? SDL_strdup(value) : NULL;
if (old_value) {
SDL_free(old_value);
}
}
hint->priority = priority;
return SDL_TRUE;