Function decrease_usages

butano/src/bn_bgs_manager.cpp:804–832

}

void decrease_usages(id_type id)
{
    auto item = static_cast<item_type*>(id);
    --item->usages;

    if(! item->usages) [[likely]]
    {
        static_data& data = data_ref();

        if(! data.rebuild_handles && item->visible)
        {
            data.rebuild_handles = true;
        }

        erase(data.items_vector, item);
        data.items_pool.destroy(*item);

        if(data.bitmap_affine_bg_tiles_handle != -1)
        {
            bg_blocks_manager::decrease_usages(data.bitmap_affine_bg_tiles_handle);
            data.bitmap_affine_bg_tiles_handle = -1;

            sprite_tiles_manager::decrease_usages(data.bitmap_sprite_tiles_handle);
            data.bitmap_sprite_tiles_handle = -1;

            data.bitmap_palette.reset();
        }
    }
}

int hw_id(id_type id)
{