Add safe indexer access methods

rust-toolchain.toml

-[toolchain]
-channel = "nightly"
\ No newline at end of file

src/system/utils.rs

@@ -54,6 +54,18 @@ impl Indexer {
 		((y.as_() * self.width) + x.as_()).as_()
 	}
 
+	pub fn index_checked(
+		&self,
+		x: impl AsPrimitive<i64>,
+		y: impl AsPrimitive<i64>,
+	) -> Option<usize> {
+		if self.is_valid(x, y) {
+			Some(self.index(x, y))
+		} else {
+			None
+		}
+	}
+
 	pub fn reverse(&self, index: impl AsPrimitive<i64>) -> (usize, usize) {
 		(
 			(index.as_() % self.width).max(0) as usize,
@@ -67,4 +79,11 @@ impl Indexer {
 	pub fn height(&self) -> i64 {
 		self.height
 	}
+
+	pub fn is_valid(&self, x: impl AsPrimitive<i64>, y: impl AsPrimitive<i64>) -> bool {
+		let x = x.as_();
+		let y = y.as_();
+
+		x >= 0 && x < self.width && y >= 0 && y < self.height
+	}
 }