sync with local; working normal/complex conversions

src/ascii_manipulation.rs

@@ -0,0 +1,44 @@
+use image::{DynamicImage, GenericImageView, Rgba};
+
+//todo: consider how to take care of the a channel => do we want to render that as background?
+fn get_color(pixel: (u32, u32, Rgba<u8>)) -> u8 {
+    let vec = pixel.2.0;
+    //luminosity method of getting lightness
+    (vec[0] as f32 * 0.3 + vec[1] as f32 * 0.59 + vec[2] as f32 * 0.11) as u8
+}
+
+fn to_ascii(char_map: String, image: DynamicImage) -> Vec<String> {
+    //todo: add color support
+    let l = char_map.len() as f32;
+    let mut str = String::new();
+    let mut out: Vec<String> = Vec::new();
+
+    for pixel in image.pixels() {
+        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)
+        str.push(char::from(ch));   //fixme: this is finicky and also very unsafe
+
+        if pixel.0 == image.width()-1 {
+            out.push(str);
+            str = String::new();
+        }
+    }
+    out
+}
+
+pub fn to_simple_ascii(image: DynamicImage) -> Vec<String> {
+    to_ascii(" .:-=+*#%@".to_owned(), image)
+}
+
+pub fn to_complex_ascii(image: DynamicImage) -> Vec<String> {
+    to_ascii(" .'`^\",:;Il!i><~+_-?][}{1)(|\\/tfjrxnuvczXYUJCLQ0OZmwqpdbkhao*#MW&8%B@$".to_owned(), image)
+}
+
+pub fn to_braille_ascii(image: DynamicImage) -> Vec<String> {
+    //todo: figure out braille symbols
+    vec!["not implemented".to_owned()]
+}
+
+pub fn to_custom_ascii(char_map: String, image: DynamicImage) -> Vec<String> {
+    //todo: this
+    vec!["not implemented".to_owned()]
+}