improve apply_filters performance

1 files changed, 20 insertions, 0 deletions

diff --git a/examples/profile.rs b/examples/profile.rs
new file mode 100644
index 0000000..acc8154
--- /dev/null
+++ b/examples/profile.rs
@@ -0,0 +1,20 @@
+//! this file is just meant for profiling
+
+use std::hint::black_box;
+
+fn main() {
+	if cfg!(debug_assertions) {
+		eprintln!("this should only be run in release mode");
+	} else {
+		println!("pid = {}", std::process::id());
+		let large_image = black_box(std::fs::read("benches/large.png").unwrap());
+
+		for _ in 0..100 {
+			let mut png = &large_image[..];
+			let header = tiny_png::read_png_header(&mut png).unwrap();
+			let mut buf = vec![0; header.required_bytes()];
+			let data = tiny_png::read_png(&mut png, Some(&header), &mut buf).unwrap();
+			std::hint::black_box(data);
+		}
+	}
+}