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|
extern crate criterion;
use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};
use image::{codecs::bmp::BmpEncoder, codecs::jpeg::JpegEncoder, ColorType};
use std::fs::File;
use std::io::{BufWriter, Seek, SeekFrom, Write};
trait Encoder {
fn encode_raw(&self, into: &mut Vec<u8>, im: &[u8], dims: u32, color: ColorType);
fn encode_bufvec(&self, into: &mut Vec<u8>, im: &[u8], dims: u32, color: ColorType);
fn encode_file(&self, file: &File, im: &[u8], dims: u32, color: ColorType);
}
#[derive(Clone, Copy)]
struct BenchDef {
with: &'static dyn Encoder,
name: &'static str,
sizes: &'static [u32],
colors: &'static [ColorType],
}
fn encode_all(c: &mut Criterion) {
const BENCH_DEFS: &'static [BenchDef] = &[
BenchDef {
with: &Bmp,
name: "bmp",
sizes: &[100u32, 200, 400],
colors: &[ColorType::L8, ColorType::Rgb8, ColorType::Rgba8],
},
BenchDef {
with: &Jpeg,
name: "jpeg",
sizes: &[64u32, 128, 256],
colors: &[ColorType::L8, ColorType::Rgb8, ColorType::Rgba8],
},
];
for definition in BENCH_DEFS {
encode_definition(c, definition)
}
}
criterion_group!(benches, encode_all);
criterion_main!(benches);
type BenchGroup<'a> = criterion::BenchmarkGroup<'a, criterion::measurement::WallTime>;
/// Benchmarks encoding a zeroed image.
///
/// For compressed formats this is surely not representative of encoding a normal image but it's a
/// start for benchmarking.
fn encode_zeroed(group: &mut BenchGroup, with: &dyn Encoder, size: u32, color: ColorType) {
let bytes = size as usize * usize::from(color.bytes_per_pixel());
let im = vec![0; bytes * bytes];
group.bench_with_input(
BenchmarkId::new(format!("zero-{:?}-rawvec", color), size),
&im,
|b, image| {
let mut v = vec![];
with.encode_raw(&mut v, &im, size, color);
b.iter(|| with.encode_raw(&mut v, image, size, color));
},
);
group.bench_with_input(
BenchmarkId::new(format!("zero-{:?}-bufvec", color), size),
&im,
|b, image| {
let mut v = vec![];
with.encode_raw(&mut v, &im, size, color);
b.iter(|| with.encode_bufvec(&mut v, image, size, color));
},
);
group.bench_with_input(
BenchmarkId::new(format!("zero-{:?}-file", color), size),
&im,
|b, image| {
let file = File::create("temp.bmp").unwrap();
b.iter(|| with.encode_file(&file, image, size, color));
},
);
}
fn encode_definition(criterion: &mut Criterion, def: &BenchDef) {
let mut group = criterion.benchmark_group(format!("encode-{}", def.name));
for &color in def.colors {
for &size in def.sizes {
encode_zeroed(&mut group, def.with, size, color);
}
}
}
struct Bmp;
struct Jpeg;
trait EncoderBase {
fn encode(&self, into: impl Write, im: &[u8], dims: u32, color: ColorType);
}
impl<T: EncoderBase> Encoder for T {
fn encode_raw(&self, into: &mut Vec<u8>, im: &[u8], dims: u32, color: ColorType) {
into.clear();
self.encode(into, im, dims, color);
}
fn encode_bufvec(&self, into: &mut Vec<u8>, im: &[u8], dims: u32, color: ColorType) {
into.clear();
let buf = BufWriter::new(into);
self.encode(buf, im, dims, color);
}
fn encode_file(&self, mut file: &File, im: &[u8], dims: u32, color: ColorType) {
file.seek(SeekFrom::Start(0)).unwrap();
let buf = BufWriter::new(file);
self.encode(buf, im, dims, color);
}
}
impl EncoderBase for Bmp {
fn encode(&self, mut into: impl Write, im: &[u8], size: u32, color: ColorType) {
let mut x = BmpEncoder::new(&mut into);
x.encode(im, size, size, color).unwrap();
}
}
impl EncoderBase for Jpeg {
fn encode(&self, mut into: impl Write, im: &[u8], size: u32, color: ColorType) {
let mut x = JpegEncoder::new(&mut into);
x.encode(im, size, size, color).unwrap();
}
}
|
