# transferables.rs - source
Source of the Rust file `maplibre/src/raster/transferables.rs`.

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    use std::fmt::{Debug, Formatter};

    use image::RgbaImage;

    use crate::{
        coords::WorldTileCoords,
        io::apc::{IntoMessage, Message, MessageTag},
        raster::{AvailableRasterLayerData, MissingRasterLayerData},
    };

    #[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
    pub enum RasterMessageTag {
        LayerRaster,
        LayerRasterMissing,
    }

    impl MessageTag for RasterMessageTag {
        fn dyn_clone(&self) -> Box<dyn MessageTag> {
            Box::new(*self)
        }
    }

    pub trait LayerRaster: IntoMessage + Debug + Send {
        fn message_tag() -> &'static dyn MessageTag;

        fn build_from(coords: WorldTileCoords, layer_name: String, image: RgbaImage) -> Self;

        fn coords(&self) -> WorldTileCoords;

        fn to_layer(self) -> AvailableRasterLayerData;
    }

    pub trait LayerRasterMissing: IntoMessage + Debug + Send {
        fn message_tag() -> &'static dyn MessageTag;

        fn build_from(coords: WorldTileCoords) -> Self;

        fn coords(&self) -> WorldTileCoords;

        fn to_layer(self) -> MissingRasterLayerData;
    }

    pub struct DefaultLayerRaster {
        pub coords: WorldTileCoords,
        pub layer_name: String,
        pub image: RgbaImage,
    }

    impl Debug for DefaultLayerRaster {
        fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
            write!(f, "DefaultRasterLayer({})", self.coords)
        }
    }

    impl IntoMessage for DefaultLayerRaster {
        fn into(self) -> Message {
            Message::new(Self::message_tag(), Box::new(self))
        }
    }

    impl LayerRaster for DefaultLayerRaster {
        fn message_tag() -> &'static dyn MessageTag {
            &RasterMessageTag::LayerRaster
        }

        fn build_from(coords: WorldTileCoords, layer_name: String, image: RgbaImage) -> Self {
            Self {
                coords,
                layer_name,
                image,
            }
        }

        fn coords(&self) -> WorldTileCoords {
            self.coords
        }

        fn to_layer(self) -> AvailableRasterLayerData {
            AvailableRasterLayerData {
                coords: self.coords,
                source_layer: "raster".to_string(),
                image: self.image,
            }
        }
    }

    pub struct DefaultLayerRasterMissing {
        pub coords: WorldTileCoords,
    }

    impl Debug for DefaultLayerRasterMissing {
        fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
            write!(f, "DefaultRasterLayerMissing({})", self.coords)
        }
    }

    impl IntoMessage for DefaultLayerRasterMissing {
        fn into(self) -> Message {
            Message::new(Self::message_tag(), Box::new(self))
        }
    }

    impl LayerRasterMissing for DefaultLayerRasterMissing {
        fn message_tag() -> &'static dyn MessageTag {
            &RasterMessageTag::LayerRasterMissing
        }

        fn build_from(coords: WorldTileCoords) -> Self {
            Self { coords }
        }

        fn coords(&self) -> WorldTileCoords {
            self.coords
        }

        fn to_layer(self) -> MissingRasterLayerData {
            MissingRasterLayerData {
                coords: self.coords,
                source_layer: "raster".to_string(),
            }
        }
    }

    pub trait RasterTransferables: Copy + Clone + 'static {
        type LayerRaster: LayerRaster;
        type LayerRasterMissing: LayerRasterMissing;
    }

    #[derive(Copy, Clone)]
    pub struct DefaultRasterTransferables;

    impl RasterTransferables for DefaultRasterTransferables {
        type LayerRaster = DefaultLayerRaster;
        type LayerRasterMissing = DefaultLayerRasterMissing;
    }