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decode.rs
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decode.rs
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use std::fs::read;
use std::time::Duration;
use criterion::{black_box, criterion_group, criterion_main, Criterion, Throughput};
fn decode_ref(data: &[u8]) -> Vec<u8>
{
let decoder = png::Decoder::new(data);
let mut reader = decoder.read_info().unwrap();
// Allocate the output buffer.
let mut buf = vec![0; reader.output_buffer_size()];
// Read the next frame. An APNG might contain multiple frames.
let _ = reader.next_frame(&mut buf).unwrap();
buf
}
fn decode_zune(data: &[u8]) -> Vec<u8>
{
zune_png::PngDecoder::new(data).decode_raw().unwrap()
}
fn decode_spng(data: &[u8]) -> Vec<u8>
{
let cursor = std::io::Cursor::new(data);
let decoder = spng::Decoder::new(cursor);
let (_, mut reader) = decoder.read_info().unwrap();
let output_buffer_size = reader.output_buffer_size();
let mut out = vec![0; output_buffer_size];
reader.next_frame(&mut out).unwrap();
out
}
fn decode_lodepng(data: &[u8]) -> lodepng::Image
{
lodepng::Decoder::new().decode(data).unwrap()
}
fn decode_test(c: &mut Criterion)
{
let path = env!("CARGO_MANIFEST_DIR").to_string() + "/tests/benchmarks/speed_bench.png";
let data = read(path).unwrap();
let mut group = c.benchmark_group("png: PNG decoding baseline");
group.throughput(Throughput::Bytes(data.len() as u64));
group.bench_function("zune-png", |b| {
b.iter(|| black_box(decode_zune(data.as_slice())))
});
group.bench_function("image-rs/png", |b| {
b.iter(|| black_box(decode_ref(data.as_slice())))
});
group.bench_function("spng", |b| {
b.iter(|| black_box(decode_spng(data.as_slice())))
});
group.bench_function("lodepng", |b| {
b.iter(|| black_box(decode_lodepng(data.as_slice())))
});
}
fn decode_test_interlaced(c: &mut Criterion)
{
let path =
env!("CARGO_MANIFEST_DIR").to_string() + "/tests/benchmarks/speed_bench_interlaced.png";
let data = read(path).unwrap();
let mut group = c.benchmark_group("png: PNG decoding interlaced 8bpp");
group.throughput(Throughput::Bytes(data.len() as u64));
group.bench_function("zune-png", |b| {
b.iter(|| black_box(decode_zune(data.as_slice())))
});
group.bench_function("image-rs/png", |b| {
b.iter(|| black_box(decode_ref(data.as_slice())))
});
group.bench_function("spng", |b| {
b.iter(|| black_box(decode_spng(data.as_slice())))
});
group.bench_function("lodepng", |b| {
b.iter(|| black_box(decode_lodepng(data.as_slice())))
});
}
fn decode_test_16_bit(c: &mut Criterion)
{
let path = env!("CARGO_MANIFEST_DIR").to_string() + "/tests/benchmarks/speed_bench_16.png";
let data = read(path).unwrap();
let mut group = c.benchmark_group("png: PNG decoding 16 bpp");
group.throughput(Throughput::Bytes(data.len() as u64));
group.bench_function("zune-png", |b| {
b.iter(|| black_box(decode_zune(data.as_slice())))
});
group.bench_function("image-rs/png", |b| {
b.iter(|| black_box(decode_ref(data.as_slice())))
});
group.bench_function("spng", |b| {
b.iter(|| black_box(decode_spng(data.as_slice())))
});
group.bench_function("lodepng", |b| {
b.iter(|| black_box(decode_lodepng(data.as_slice())))
});
}
criterion_group!(name=benches;
config={
let c = Criterion::default();
c.measurement_time(Duration::from_secs(20))
};
targets=decode_test_16_bit);
criterion_main!(benches);