img_by_internal_id(GraphicsManager *self, id_type id) {
    for (size_t i = 0; i < self->image_count; i++) {
        if (self->images[i].internal_id == id) return self->images + i;
    }
    return NULL;
}
img_by_internal_id(GraphicsManager *self, id_type id) {
    for (size_t i = 0; i < self->image_count; i++) {
        if (self->images[i].internal_id == id) return self->images + i;
    }
    return NULL;
}