fix: make mimalloc and rayon conditional for wasm32 target

Author: taskylizard

.cargo/config.toml

@@ -1,2 +1,11 @@
-[build]
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "target-cpu=native"]
+
+[target.aarch64-unknown-linux-gnu]
+rustflags = ["-C", "target-cpu=native"]
+
+[target.x86_64-apple-darwin]
+rustflags = ["-C", "target-cpu=native"]
+
+[target.aarch64-apple-darwin]
 rustflags = ["-C", "target-cpu=native"]

Cargo.toml

@@ -33,9 +33,9 @@ lto = "fat"
 codegen-units = 1
 panic = "abort"
 
-[dependencies.mimalloc]
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies.mimalloc]
 version = "0.1"
 default-features = false
 
-[dependencies.rayon]
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies.rayon]
 version = "1.10"

src/main.rs

@@ -3,6 +3,7 @@ use std::{
     path::{Path, PathBuf},
 };
 
+#[cfg(not(target_arch = "wasm32"))]
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
 

src/render.rs

@@ -1,6 +1,7 @@
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 use image::{Rgba, RgbaImage};
+#[cfg(not(target_arch = "wasm32"))]
 use rayon::prelude::*;
 
 use crate::{
@@ -93,10 +94,12 @@ impl Render {
         let row_stride = out_w * 4;
         let out_raw = self.out.as_mut();
 
-        out_raw
-            .par_chunks_mut(row_stride)
-            .enumerate()
-            .for_each(|(y, row)| {
+        #[cfg(not(target_arch = "wasm32"))]
+        let iter = out_raw.par_chunks_mut(row_stride).enumerate();
+        #[cfg(target_arch = "wasm32")]
+        let iter = out_raw.chunks_mut(row_stride).enumerate();
+
+        iter.for_each(|(y, row)| {
                 let map_y_base = (y as i32 + off) as u32;
                 if map_y_base >= mapping.map1.height() || map_y_base >= mapping.map2.height() {
                     return;