Add decoding benchmarks

Cargo.toml

@@ -21,3 +21,10 @@ lzw = "0.10"
 [dependencies.miniz_oxide]
 version = "0.4.1"
 features = ["no_extern_crate_alloc"]
+
+[dev-dependencies]
+criterion = "0.3.1"
+
+[[bench]]
+name = "lzw"
+harness = false

benches/lzw.rs

@@ -0,0 +1,72 @@
+extern crate criterion;
+extern crate tiff;
+
+use criterion::{black_box, BenchmarkId, BenchmarkGroup, Criterion, Throughput, measurement::Measurement};
+use tiff::decoder::Decoder;
+
+fn read_image(image: &[u8]) {
+    let image = std::io::Cursor::new(image);
+    let decoder = Decoder::new(black_box(image));
+    let mut reader = decoder.unwrap();
+
+    while {
+        reader.read_image().unwrap();
+        reader.more_images()
+    } {}
+}
+
+fn main() {
+    struct BenchDef {
+        data: &'static [u8],
+        id: &'static str,
+        sample_size: usize,
+    }
+
+    fn run_bench_def<M: Measurement>(group: &mut BenchmarkGroup<M>, def: BenchDef) {
+        group
+            .sample_size(def.sample_size)
+            .throughput(Throughput::Bytes(def.data.len() as u64))
+            .bench_with_input(
+                BenchmarkId::new(def.id, def.data.len()),
+                def.data,
+                |b, input| {
+                    b.iter(|| read_image(input))
+                }
+            );
+    };
+
+    let mut c = Criterion::default().configure_from_args();
+    let mut group = c.benchmark_group("tiff-lzw");
+
+    /*
+    run_bench_def(&mut group, BenchDef {
+        data: include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/tests/images/quad-lzw-compat.tiff")),
+        id: "quad-lzw.tif",
+        sample_size: 500,
+    });
+    */
+
+    run_bench_def(&mut group, BenchDef {
+        data: include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/tests/images/issue_69_lzw.tiff")),
+        id: "issue-69-lzw.tif",
+        sample_size: 500,
+    });
+
+    run_bench_def(&mut group, BenchDef {
+        data: include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/tests/benches/kodim02-lzw.tif")),
+        id: "kodim02-lzw.tif",
+        sample_size: 20,
+    });
+
+    run_bench_def(&mut group, BenchDef {
+        data: include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/tests/benches/kodim07-lzw.tif")),
+        id: "kodim07-lzw.tif",
+        sample_size: 20,
+    });
+
+    run_bench_def(&mut group, BenchDef {
+        data: include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/tests/benches/Transparency-lzw.tif")),
+        id: "Transparency-lzw.tif",
+        sample_size: 20,
+    });
+}

tests/benches/README.md

@@ -0,0 +1,4 @@
+Copyrights:
+
+kodim*.png: Eastman Kodak Company, released for unrestricted use
+Transparency.png: Public Domain, according to Wikimedia