45 lines
1.5 KiB
Rust
45 lines
1.5 KiB
Rust
use image::{DynamicImage, GenericImageView, Rgba};
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//todo: consider how to take care of the a channel => do we want to render that as background?
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fn get_color(pixel: (u32, u32, Rgba<u8>)) -> u8 {
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let vec = pixel.2.0;
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//luminosity method of getting lightness
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(vec[0] as f32 * 0.3 + vec[1] as f32 * 0.59 + vec[2] as f32 * 0.11) as u8
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}
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fn to_ascii(char_map: String, image: DynamicImage) -> Vec<String> {
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//todo: add color support
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let l = char_map.len() as f32;
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let mut str = String::new();
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let mut out: Vec<String> = Vec::new();
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for pixel in image.pixels() {
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let ch = char_map.as_bytes()[((get_color(pixel) as f32-1.0)/255f32 * l) as usize]; //fixme: might break with non-ASCII char_map (ie braille chars, possibly)
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str.push(char::from(ch)); //fixme: this is finicky and also very unsafe
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if pixel.0 == image.width()-1 {
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out.push(str);
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str = String::new();
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}
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}
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out
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}
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pub fn to_simple_ascii(image: DynamicImage) -> Vec<String> {
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to_ascii(" .:-=+*#%@".to_owned(), image)
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}
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pub fn to_complex_ascii(image: DynamicImage) -> Vec<String> {
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to_ascii(" .'`^\",:;Il!i><~+_-?][}{1)(|\\/tfjrxnuvczXYUJCLQ0OZmwqpdbkhao*#MW&8%B@$".to_owned(), image)
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}
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pub fn to_braille_ascii(image: DynamicImage) -> Vec<String> {
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//todo: figure out braille symbols
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vec!["not implemented".to_owned()]
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}
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pub fn to_custom_ascii(char_map: String, image: DynamicImage) -> Vec<String> {
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//todo: this
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vec!["not implemented".to_owned()]
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}
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