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    use vulkano::image::{ImmutableImage, AttachmentImage};
    use std::sync::Arc;
    use vulkano::format::{Format, R8Unorm};
    use vulkano::sampler::Sampler;
    use vulkano::descriptor::DescriptorSet;
    use vulkano::descriptor::descriptor_set::PersistentDescriptorSet;
    use vulkano::buffer::{CpuAccessibleBuffer, BufferAccess};
    use vulkano::pipeline::GraphicsPipelineAbstract;
    use rusttype::Font;
    use crate::canvas::{CanvasTextureHandle, CanvasImageHandle, CanvasFontHandle};

    /// Canvas buffer which represents an allocated Texture with a key and dimensions
    #[derive(Clone)]
    pub struct CanvasTexture {
        pub(crate) handle: Arc<CanvasTextureHandle>,
        pub(crate) buffer: Arc<ImmutableImage<Format>>,
        pub(crate) name: String,
        pub(crate) size: (u32, u32),
    }

    impl CanvasTexture {
        pub fn get_descriptor_set(&self,
                                  pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>,
                                  sampler: Arc<Sampler>) -> Box<dyn DescriptorSet + Send + Sync> {
            let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
                PersistentDescriptorSet::start(
                    pipeline.clone(), 0,
                )
                    .add_sampled_image(self.buffer.clone(), sampler.clone()).unwrap()
                    .build().unwrap());
            o
        }
    }

    /// Canvas buffer which represents an allocated image and dimension
    #[derive(Clone)]
    pub struct CanvasImage {
        pub(crate) handle: Arc<CanvasImageHandle>,
        pub(crate) buffer: Arc<AttachmentImage>,
        pub(crate) size: (u32, u32),
    }

    impl CanvasImage {
        pub fn get_descriptor_set(&self, pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>)
                                  -> Box<dyn DescriptorSet + Send + Sync> {
            let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
                PersistentDescriptorSet::start(
                    pipeline.clone(), 0,
                )
                    .add_image(self.buffer.clone()).unwrap()
                    .build().unwrap());
            o
        }
    }

    #[derive(Clone)]
    pub struct CanvasFont {
        pub(crate) handle: Arc<CanvasFontHandle>,
        pub(crate) buffer: Arc<(dyn BufferAccess + Send + Sync)>, // Font atlas
        pub(crate) font: Font<'static>,
        pub(crate) name: String,

    }

    impl CanvasFont {
        pub fn get_descriptor_set(pipeline: Arc<dyn GraphicsPipelineAbstract + Sync + Send>)
                                  -> Box<dyn DescriptorSet + Send + Sync> {
            let o: Box<dyn DescriptorSet + Send + Sync> = Box::new(
                PersistentDescriptorSet::start(
                    pipeline.clone(), 0,
                )
                    .build().unwrap());
            o
        }
    }

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