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use image::{png::PNGEncoder, DynamicImage, ImageBuffer};
use sha2::{Digest, Sha512};
use palette::LinSrgb;
mod color;
mod grid;
mod map_values;
pub enum Symmetry {
None,
X,
Y,
}
pub struct Identicon {
hash: Vec<u8>,
symmetry: Symmetry,
border: u32,
size: u32,
scale: u32,
background_color: (u8, u8, u8),
}
impl Identicon {
pub fn new(
input_value: &str,
symmetry: Symmetry,
border: u32,
size: u32,
scale: u32,
background_color: (u8, u8, u8),
) -> Identicon {
let hash = Identicon::get_hash_value(input_value);
Identicon {
hash,
symmetry,
border,
size,
scale,
background_color,
}
}
pub fn new_default(input_value: &str) -> Identicon {
let hash = Identicon::get_hash_value(input_value);
let background_color = 240;
Identicon {
hash,
symmetry: Symmetry::None,
border: 50,
size: 5,
scale: 500,
background_color: (background_color, background_color, background_color),
}
}
pub fn new_no_border(input_value: &str) -> Identicon {
let hash = Identicon::get_hash_value(input_value);
let background_color = 240;
Identicon {
hash,
symmetry: Symmetry::None,
border: 0,
size: 5,
scale: 500,
background_color: (background_color, background_color, background_color),
}
}
fn get_hash_value(input_value: &str) -> Vec<u8> {
let input_trimmed = input_value.trim();
Sha512::digest(input_trimmed.as_bytes()).as_slice().to_vec()
}
fn get_background_color(&self) -> LinSrgb<u8> {
let background_color = self.background_color;
LinSrgb::new(background_color.0, background_color.1, background_color.2)
}
pub fn generate_image(&self) -> DynamicImage {
let size = self.scale + self.border * 2;
let mut imgbuf = ImageBuffer::new(size, size);
let grid = grid::generate_full_grid(self.size, &self.hash);
let check_within_border = |location: u32| -> bool {
location < self.border || location >= self.border + self.scale
};
let color = color::generate_color(&self.hash);
let background_color = self.get_background_color();
let pixel_active = image::Rgb([color.red, color.green, color.blue]);
let pixel_background = image::Rgb([
background_color.red,
background_color.green,
background_color.blue,
]);
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
if check_within_border(x) || check_within_border(y) {
*pixel = pixel_background;
} else {
let location_scale = self.scale / self.size;
let x_location = (x - self.border) / location_scale;
let y_location = (y - self.border) / location_scale;
let grid_location = (x_location + y_location * self.size) % self.size.pow(2);
if grid[grid_location as usize] {
*pixel = pixel_active;
} else {
*pixel = pixel_background;
}
}
}
DynamicImage::ImageRgb8(imgbuf)
}
pub fn save_image(&self, output_filename: &str) {
self.generate_image().save(output_filename).unwrap();
}
pub fn export_file_data(&self) -> Vec<u8> {
let image = self.generate_image();
let image_size = image.to_rgb().width();
let mut file = Vec::new();
PNGEncoder::new(&mut file)
.encode(
image.to_rgb().into_raw().as_slice(),
image_size,
image_size,
image::RGB(8),
)
.unwrap();
file
}
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
use crate::Identicon;
#[test]
fn trim_of_input_works() {
let image_normal = Identicon::new_default("test").generate_image();
let image_padded = Identicon::new_default(" test ").generate_image();
assert_eq!(
image_normal.to_rgb().into_raw(),
image_padded.to_rgb().into_raw()
);
}
#[test]
fn trim_of_input_failure_works() {
let image_normal = Identicon::new_default("test").generate_image();
let image_padded = Identicon::new_default(" test1 ").generate_image();
assert_ne!(
image_normal.to_rgb().into_raw(),
image_padded.to_rgb().into_raw()
);
}
}