Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/image/benches/README.md

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+# Getting started with benchmarking
+
+To run the benchmarks you need a nightly rust toolchain.
+Then you launch it with
+
+    cargo +nightly bench --features=benchmarks

vendor/image/benches/copy_from.rs

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+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use image::{GenericImage, ImageBuffer, Rgba};
+
+pub fn bench_copy_from(c: &mut Criterion) {
+    let src = ImageBuffer::from_pixel(2048, 2048, Rgba([255u8, 0, 0, 255]));
+    let mut dst = ImageBuffer::from_pixel(2048, 2048, Rgba([0u8, 0, 0, 255]));
+
+    c.bench_function("copy_from", |b| {
+        b.iter(|| dst.copy_from(black_box(&src), 0, 0))
+    });
+}
+
+criterion_group!(benches, bench_copy_from);
+criterion_main!(benches);

vendor/image/benches/decode.rs

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+use std::{fs, iter, path};
+
+use criterion::{criterion_group, criterion_main, Criterion};
+use image::ImageFormat;
+
+#[derive(Clone, Copy)]
+struct BenchDef {
+    dir: &'static [&'static str],
+    files: &'static [&'static str],
+    format: ImageFormat,
+}
+
+fn load_all(c: &mut Criterion) {
+    const BENCH_DEFS: &'static [BenchDef] = &[
+        BenchDef {
+            dir: &["bmp", "images"],
+            files: &[
+                "Core_1_Bit.bmp",
+                "Core_4_Bit.bmp",
+                "Core_8_Bit.bmp",
+                "rgb16.bmp",
+                "rgb24.bmp",
+                "rgb32.bmp",
+                "pal4rle.bmp",
+                "pal8rle.bmp",
+                "rgb16-565.bmp",
+                "rgb32bf.bmp",
+            ],
+            format: ImageFormat::Bmp,
+        },
+        BenchDef {
+            dir: &["gif", "simple"],
+            files: &["alpha_gif_a.gif", "sample_1.gif"],
+            format: ImageFormat::Gif,
+        },
+        BenchDef {
+            dir: &["hdr", "images"],
+            files: &["image1.hdr", "rgbr4x4.hdr"],
+            format: ImageFormat::Hdr,
+        },
+        BenchDef {
+            dir: &["ico", "images"],
+            files: &[
+                "bmp-24bpp-mask.ico",
+                "bmp-32bpp-alpha.ico",
+                "png-32bpp-alpha.ico",
+                "smile.ico",
+            ],
+            format: ImageFormat::Ico,
+        },
+        BenchDef {
+            dir: &["jpg", "progressive"],
+            files: &["3.jpg", "cat.jpg", "test.jpg"],
+            format: ImageFormat::Jpeg,
+        },
+        // TODO: pnm
+        // TODO: png
+        BenchDef {
+            dir: &["tga", "testsuite"],
+            files: &["cbw8.tga", "ctc24.tga", "ubw8.tga", "utc24.tga"],
+            format: ImageFormat::Tga,
+        },
+        BenchDef {
+            dir: &["tiff", "testsuite"],
+            files: &[
+                "hpredict.tiff",
+                "hpredict_packbits.tiff",
+                "mandrill.tiff",
+                "rgb-3c-16b.tiff",
+            ],
+            format: ImageFormat::Tiff,
+        },
+        BenchDef {
+            dir: &["webp", "images"],
+            files: &[
+                "simple-gray.webp",
+                "simple-rgb.webp",
+                "vp8x-gray.webp",
+                "vp8x-rgb.webp",
+            ],
+            format: ImageFormat::WebP,
+        },
+    ];
+
+    for bench in BENCH_DEFS {
+        bench_load(c, bench);
+    }
+}
+
+criterion_group!(benches, load_all);
+criterion_main!(benches);
+
+fn bench_load(c: &mut Criterion, def: &BenchDef) {
+    let group_name = format!("load-{:?}", def.format);
+    let mut group = c.benchmark_group(&group_name);
+    let paths = IMAGE_DIR.iter().chain(def.dir);
+
+    for file_name in def.files {
+        let path: path::PathBuf = paths.clone().chain(iter::once(file_name)).collect();
+        let buf = fs::read(path).unwrap();
+        group.bench_function(file_name.to_owned(), |b| {
+            b.iter(|| {
+                image::load_from_memory_with_format(&buf, def.format).unwrap();
+            })
+        });
+    }
+}
+
+const IMAGE_DIR: [&'static str; 3] = [".", "tests", "images"];

vendor/image/benches/encode.rs

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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();
+    }
+}