greenglas 0.3.0

Data Preprocessing library for Machine Learning
Documentation 
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use crate::image_crate::{load_from_memory, open, DynamicImage, ImageBuffer};
use std::path::Path;

pub use self::modifiers::*;
use crate::transformer::TransformerError;
use crate::{Set, Transformer};

/// The Modifiers form `Image`
pub mod modifiers;

#[allow(missing_debug_implementations)]
/// The Transformable Data Type `Image`
pub struct Image {
    value: DynamicImage,
}

impl Set for Image {}

impl Transformer for Image {
    fn transform_to_vec(&self) -> Vec<f32> {
        self.value.to_bytes().iter().map(|&e| e as f32).collect()
    }
}

impl Image {
    /// Create a new Image from a DynamicImage
    pub fn new(image: DynamicImage) -> Image {
        Image { value: image }
    }

    /// Create a new Image from a Path
    pub fn from_path<P>(path: P) -> Image
    where
        P: AsRef<Path>,
    {
        Image {
            value: open(path).unwrap(),
        }
    }

    /// Create a new Image from Buffer
    pub fn from_buffer(buf: &[u8]) -> Image {
        Image {
            value: load_from_memory(buf).unwrap(),
        }
    }

    /// Create a new Image from RGB style pixel container such as `Vec`
    pub fn from_rgb_pixels(w: u32, h: u32, buf: Vec<u8>) -> Result<Image, TransformerError> {
        let dynamic_image = ImageBuffer::from_raw(w, h, buf).map(DynamicImage::ImageRgb8);
        match dynamic_image {
            Some(image) => Ok(Image { value: image }),
            None => Err(TransformerError::InvalidRgbPixels),
        }
    }

    /// Create a new Image from RGBa style pixel container such as `Vec`
    pub fn from_rgba_pixels(w: u32, h: u32, buf: Vec<u8>) -> Result<Image, TransformerError> {
        let dynamic_image = ImageBuffer::from_raw(w, h, buf).map(DynamicImage::ImageRgba8);
        match dynamic_image {
            Some(image) => Ok(Image { value: image }),
            None => Err(TransformerError::InvalidRgbaPixels),
        }
    }

    /// Create a new Image from Luma (greyscale) style pixel container such as `Vec`
    pub fn from_luma_pixels(w: u32, h: u32, buf: Vec<u8>) -> Result<Image, TransformerError> {
        let dynamic_image = ImageBuffer::from_raw(w, h, buf).map(DynamicImage::ImageLuma8);
        match dynamic_image {
            Some(image) => Ok(Image { value: image }),
            None => Err(TransformerError::InvalidLumaPixels),
        }
    }

    /// Create a new Image from LumaA style pixel container such as `Vec`
    pub fn from_lumaa_pixels(w: u32, h: u32, buf: Vec<u8>) -> Result<Image, TransformerError> {
        let dynamic_image = ImageBuffer::from_raw(w, h, buf).map(DynamicImage::ImageLumaA8);
        match dynamic_image {
            Some(image) => Ok(Image { value: image }),
            None => Err(TransformerError::InvalidLumaAlphaPixels),
        }
    }
}