melvin_ob::imaging::map_image

Struct ThumbnailMapImage

Source 
pub(crate) struct ThumbnailMapImage {
    image_buffer: RgbImage,
}
Expand description

Represents a thumbnail image generated from a full-size map image.

This struct is designed to manage scaled-down versions of map images, which are useful for generating previews or comparing snapshots.

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§image_buffer: RgbImage

The underlying image buffer storing the pixel data of the thumbnail.

Implementations§

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impl ThumbnailMapImage

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pub(crate) const THUMBNAIL_SCALE_FACTOR: u32 = 25u32

Defines the scale factor for generating a thumbnail from a full-size map image.

The dimensions of the thumbnail are calculated by dividing the full-sized map dimensions by this constant.

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pub(crate) fn thumbnail_size() -> Vec2D<u32>

Calculates the size of the thumbnail based on the full-size map dimensions.

This method uses the THUMBNAIL_SCALE_FACTOR to scale down the map size.

§Returns

A Vec2D<u32> representing the dimensions of the thumbnail.

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pub(crate) fn from_fullsize(fullsize_map_image: &FullsizeMapImage) -> Self

Generates a thumbnail from a given full-sized map image.

This method scales down the provided FullsizeMapImage to create a thumbnail using the pre-defined thumbnail_size.

§Arguments
  • fullsize_map_image - A reference to the FullsizeMapImage to be converted.
§Returns

A ThumbnailMapImage containing the scaled-down image.

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pub(crate) fn from_snapshot<P: AsRef<Path>>(snapshot_path: P) -> Self

Generates a thumbnail from a previously saved snapshot.

If the snapshot file exists, it is loaded and converted into a thumbnail. If it does not exist, a blank image with the dimensions of the thumbnail is created.

§Arguments
  • snapshot_path - The file path to the snapshot PNG.
§Returns

A ThumbnailMapImage containing either the loaded thumbnail image or a blank thumbnail.

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pub(crate) async fn diff_with_snapshot<P: AsRef<Path>>( &self, base_snapshot_path: P, ) -> Result<EncodedImageExtract, Box<dyn Error>>

Computes the difference between the current thumbnail and a snapshot.

This method compares the pixel data of the current thumbnail against a previously saved snapshot and creates a new image showing the differences. Pixels that are identical are marked as transparent, and differing pixels retain their values.

If the snapshot file does not exist, the current thumbnail is exported as a PNG.

§Arguments
  • base_snapshot_path - The file path to the base snapshot PNG.
§Returns

An EncodedImageExtract containing the diff image as a PNG.

§Errors

Returns an error if the snapshot file cannot be read or the PNG encoding fails.

Trait Implementations§

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impl MapImage for ThumbnailMapImage

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type Pixel = Rgb<u8>

The pixel type used, which is RGBA with 8-bit sub-pixels.

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type Container = Vec<u8>

The container type for the pixel data, represented as a vector of bytes.

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type ViewSubBuffer = ImageBuffer<Rgb<u8>, Vec<u8>>

The view type for sub-regions of the thumbnail, implemented as an ImageBuffer.

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fn mut_vec_view( &mut self, offset: Vec2D<u32>, ) -> SubBuffer<&mut ImageBuffer<Rgb<u8>, Vec<u8>>>

Provides a mutable view of the thumbnail at the specified offset.

§Arguments
  • offset - The top-left corner of the requested sub-region.
§Returns

A SubBuffer representing the specified sub-region of the thumbnail.

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fn vec_view( &self, offset: Vec2D<u32>, size: Vec2D<u32>, ) -> SubBuffer<&ImageBuffer<Rgb<u8>, Vec<u8>>>

Provides a view of a sub-region of the thumbnail.

§Arguments
  • offset - The top-left corner of the requested sub-region.
  • size - The dimensions of the requested sub-region.
§Returns

A SubBuffer representing the specified sub-region of the thumbnail.

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fn buffer(&self) -> &ImageBuffer<Self::Pixel, Self::Container>

Returns a reference to the entire image buffer of the thumbnail.

§Returns

A reference to the image buffer storing the thumbnail’s pixel data.

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fn export_as_png(&self) -> Result<EncodedImageExtract, Box<dyn Error>>
where [<Self::Pixel as Pixel>::Subpixel]: EncodableLayout,

Exports the entire image buffer as a PNG. Read more
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fn export_area_as_png( &self, offset: Vec2D<u32>, size: Vec2D<u32>, ) -> Result<EncodedImageExtract, Box<dyn Error>>
where [<<Self::ViewSubBuffer as GenericImageView>::Pixel as Pixel>::Subpixel]: EncodableLayout,

Exports a specific sub-region of the image as a PNG. Read more
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fn create_snapshot<P: AsRef<Path>>(&self, path: P) -> Result<(), Box<dyn Error>>
where [<Self::Pixel as Pixel>::Subpixel]: EncodableLayout,

Saves the current image buffer as a snapshot in PNG format. Read more
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fn update_area<I: GenericImageView<Pixel = Self::Pixel>>( &mut self, offset: Vec2D<u32>, image: &I, )

Updates a specific sub-region of the image with the given data. Read more

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