Add fast exp + minor fixes

Author: Snehal-Reddy

exp_lut_macro/src/lib.rs

@@ -3,7 +3,7 @@ extern crate proc_macro;
 use proc_macro::TokenStream;
 use quote::quote;
 use syn::{
-    Ident, LitFloat, LitInt, LitStr, Result, Token, parse::{Parse, ParseStream}, parse_macro_input
+    Ident, LitFloat, LitInt, Result, Token, parse::{Parse, ParseStream}, parse_macro_input
 };
 
 #[derive(Debug, Clone)]

src/lib.rs

@@ -57,6 +57,16 @@ exp_lut_macro::exp_lut_macro!(
     steps: 1000
 );
 
+#[inline(always)]
+fn fast_exp(x: f32) -> f32 {
+    if x >= EXP_LOOKUP_START && x <= EXP_LOOKUP_END {
+        let index = ((x - EXP_LOOKUP_START) / EXP_LOOKUP_STEP_SIZE) as usize;
+        EXP_LOOKUP_LUT[index]
+    } else {
+        x.exp()
+    }
+}
+
 
 #[inline(always)]
 /// We use a logistic function as the transformation function.

src/main.rs

@@ -4,7 +4,6 @@ use evdev::{Device, EventType, RelativeAxisCode, uinput::VirtualDevice};
 use log::{error, info};
 use mouse_scroll_daemon::{AnxiousParams, AnxiousState, process_events};
 use std::path::PathBuf;
-use std::path::Path;
 
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]