Add criterion benchmark

Cargo.toml

@@ -16,3 +16,8 @@ bytemuck = "1.12"
 
 [dev-dependencies]
 image = "0.24"
+criterion = "0.3"
+
+[[bench]]
+name = "decoding"
+harness = false

benches/decoding.rs

@@ -0,0 +1,27 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use dtm::DTM;
+
+fn decode_full_png() {
+    let _data_png = image::open("data/N265E425.png").unwrap();
+}
+
+fn decode_full_dtm() {
+    let (_descriptor, _data_dtm) = DTM::decode_file("data/N265E425.dtm").unwrap();
+}
+
+fn decode_full_tif() {
+    let _data_tif = image::open("data/N265E425.tif").unwrap();
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("png full", |b| b.iter(|| decode_full_png()));
+    c.bench_function("dtm full", |b| b.iter(|| decode_full_dtm()));
+    c.bench_function("tif full", |b| b.iter(|| decode_full_tif()));
+}
+
+criterion_group! {
+    name = benches;
+    config = Criterion::default().sample_size(10);
+    targets = criterion_benchmark
+}
+criterion_main!(benches);