Function vulkano::swapchain::present_incremental

pub fn present_incremental<F, W>(
    swapchain: Arc<Swapchain<W>>, 
    before: F, 
    queue: Arc<Queue>, 
    index: usize, 
    present_region: PresentRegion
) -> PresentFuture<F, W> where
    F: GpuFuture, 

Same as swapchain::present, except it allows specifying a present region. Areas outside the present region may be ignored by Vulkan in order to optimize presentation.

This is just an optimization hint, as the Vulkan driver is free to ignore the given present region.

If VK_KHR_incremental_present is not enabled on the device, the parameter will be ignored.