Fast and safe image scaling in Rust

This crate provides zero unsafe fast rescaling.

Example

let img = ImageReader::open("./assets/nasa-4928x3279.png")
    .unwrap()
    .decode()
    .unwrap();
let dimensions = img.dimensions();
let transient = img.to_rgb8();

let start = Instant::now();

let src_size = ImageSize::new(dimensions.0 as usize, dimensions.1 as usize);
let dst_size = ImageSize::new(dimensions.0 as usize / 4, dimensions.1 as usize / 4);

let resized = resize_rgb8(&transient, src_size, dst_size, 
                          ResamplingFunction::Lanczos3).unwrap();

Example comparison time for downscale RGBA 4928x3279 8 bit image in 4 times.

cargo bench --bench resize_rgba --manifest-path ./app/Cargo.toml

	Lanczos3	Bilinear
image(aarch64)	121.19	48.89
pic-scale(aarch64)	26.90	15.13
fir(aarch64)	25.93	11.30
image(x86)	192.52	88.63
pic-scale(x86)	49.79	35.98
pic-scale(x86-cpu-native)	27.21	20.48
fir(x86)	42.89	24.13
fir(x86-cpu-native)	41.17	23.62

Example comparison time for downscale RGB 4928x3279 8 bit image in 4 times.

cargo bench --bench resize_rgb --manifest-path ./app/Cargo.toml

	Lanczos3	Bilinear
image(aarch64)	123.85	51.30
pic-scale(aarch64)	31.73	18.20
fir(aarch64)	24.04	11.37
image(x86)	201.52	90.82
pic-scale(x86)	34.54	25.05
fir(x86)	41.97	25.21

Example comparison time for downscale RGBA 4928x3279 16 bit image in 4 times.

cargo bench --bench resize_rgba_u16 --manifest-path ./app/Cargo.toml

	Lanczos3	Bilinear
image(aarch64)	123.27	52.91
pic-scale(aarch64)	28.041	18.89
fir(aarch64)	149.87	50.08
image(x86)	196.28	194.75
pic-scale(x86)	59.89	57.99
pic-scale(x86-cpu-native)	44.07	57.99
fir(x86)	52.73	28.35

Example comparison time for downscale RGB 4928x3279 16 bit image in 4 times.

cargo bench --bench resize_rgb_u16 --manifest-path ./app/Cargo.toml

	Lanczos3	Bilinear
image(aarch64)	130.45	61.06
pic-scale(aarch64)	36.10	23.80
fir(aarch64)	122.01	43.36

Example comparison time for downscale RGBA 4928x3279 f32 image in 4 times.

cargo bench --bench resize_rgba_f32 --manifest-path ./app/Cargo.toml

	Lanczos3	Bilinear
image(aarch64)	100.16	51.21
pic-scale(aarch64)	43.04	19.16
fir(aarch64)	114.35	37.75
image(x86)	164.04	98.90
pic-scale(x86)	57.39	43.84
fir(x86)	60.30	29.92

This project is licensed under either of

BSD-3-Clause License (see LICENSE)
Apache License, Version 2.0 (see LICENSE)

at your option.

pic-scale-safe 0.1.1

Fast and safe image scaling in Rust

Example