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<!-- introduction start -->
## Benchmarks of fast_image_resize crate for Wasm32 architecture
Environment:
- CPU: AMD Ryzen 9 5950X
- RAM: DDR4 4000 MHz
- Ubuntu 24.04 (linux 6.8.0)
- Rust 1.81.0
- criterion = "0.5.1"
- fast_image_resize = "5.0.0"
- wasmtime = "25.0.1"
Other libraries used to compare of resizing speed:
- image = "0.25.2" (<https://crates.io/crates/image>)
- resize = "0.8.7" (<https://crates.io/crates/resize>, single-threaded mode)
Resize algorithms:
- Nearest
- Box - convolution with minimal kernel size 1x1 px
- Bilinear - convolution with minimal kernel size 2x2 px
- Bicubic (CatmullRom) - convolution with minimal kernel size 4x4 px
- Lanczos3 - convolution with minimal kernel size 6x6 px
<!-- introduction end -->
<!-- bench_compare_rgb start -->
### Resize RGB8 image (U8x3) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 25.61 | - | 111.45 | 199.95 | 281.24 |
| resize | 11.32 | 33.48 | 60.90 | 113.34 | 166.20 |
| fir rust | 0.36 | 40.56 | 76.04 | 148.68 | 223.70 |
| fir simd128 | 0.36 | 5.19 | 7.93 | 14.07 | 20.86 |
<!-- bench_compare_rgb end -->
<!-- bench_compare_rgba start -->
### Resize RGBA8 image (U8x4) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| resize | 12.36 | 39.11 | 73.57 | 140.10 | 216.32 |
| fir rust | 0.23 | 96.26 | 143.11 | 240.79 | 338.59 |
| fir simd128 | 0.23 | 15.98 | 18.99 | 25.80 | 33.58 |
<!-- bench_compare_rgba end -->
<!-- bench_compare_l start -->
### Resize L8 image (U8) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
has converted into grayscale image with one byte per pixel.
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 23.29 | - | 87.60 | 150.35 | 211.42 |
| resize | 7.79 | 17.22 | 27.25 | 50.98 | 74.74 |
| fir rust | 0.21 | 15.15 | 27.92 | 54.02 | 81.12 |
| fir simd128 | 0.21 | 2.65 | 3.32 | 5.36 | 7.97 |
<!-- bench_compare_l end -->
<!-- bench_compare_la start -->
### Resize LA8 image (U8x2) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
has converted into grayscale image with an alpha channel (two bytes per pixel).
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
- The `resize` crate does not support this pixel format.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| fir rust | 0.19 | 49.46 | 74.31 | 124.11 | 175.58 |
| fir simd128 | 0.19 | 8.02 | 9.41 | 12.85 | 17.58 |
<!-- bench_compare_la end -->
<!-- bench_compare_rgb16 start -->
### Resize RGB16 image (U16x3) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
has converted into RGB16 image.
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 26.75 | - | 107.99 | 188.76 | 270.38 |
| resize | 11.39 | 30.97 | 53.58 | 106.09 | 157.82 |
| fir rust | 0.42 | 34.58 | 58.12 | 107.33 | 157.86 |
| fir simd128 | 0.42 | 28.62 | 48.16 | 87.52 | 126.68 |
<!-- bench_compare_rgb16 end -->
<!-- bench_compare_rgba16 start -->
### Resize RGBA16 image (U16x4) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| resize | 12.73 | 39.77 | 75.15 | 140.39 | 214.27 |
| fir rust | 0.39 | 89.75 | 123.03 | 185.52 | 250.31 |
| fir simd128 | 0.39 | 46.65 | 70.80 | 121.69 | 170.89 |
<!-- bench_compare_rgba16 end -->
<!-- bench_compare_l16 start -->
### Resize L16 image (U16) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
has converted into grayscale image with two bytes per pixel.
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 23.45 | - | 79.42 | 134.57 | 188.61 |
| resize | 8.33 | 16.79 | 26.60 | 50.54 | 73.93 |
| fir rust | 0.19 | 18.79 | 26.98 | 46.01 | 64.94 |
| fir simd128 | 0.19 | 10.14 | 17.11 | 29.49 | 42.87 |
<!-- bench_compare_l16 end -->
<!-- bench_compare_la16 start -->
### Resize LA16 (luma with alpha channel) image (U16x2) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
has converted into grayscale image with an alpha channel (four bytes per pixel).
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
- The `resize` crate does not support this pixel format.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|-------------|:-------:|:-----:|:--------:|:-------:|:--------:|
| fir rust | 0.25 | 44.15 | 59.50 | 91.27 | 125.41 |
| fir simd128 | 0.25 | 26.02 | 38.49 | 65.75 | 92.37 |
<!-- bench_compare_la16 end -->
<!-- bench_compare_l32f start -->
### Resize L32F image (F32) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
has converted into grayscale image with two bytes per pixel.
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|----------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 13.04 | - | 63.40 | 116.33 | 167.53 |
| resize | 7.31 | 15.27 | 22.17 | 42.93 | 65.69 |
| fir rust | 0.25 | 10.20 | 18.49 | 35.77 | 59.88 |
<!-- bench_compare_l32f end -->
Note:
The `resize` crate uses `f32` for intermediate calculations.
The `fast_image_resize` uses `f64`. This is a reason why `fast_image_resize`
is slower or equal in cases with `f32`-based pixels.
<!-- bench_compare_la32f start -->
### Resize LA32F (luma with alpha channel) image (F32x2) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
has converted into grayscale image with an alpha channel (two `f32` values per pixel).
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
- The `resize` crate does not support this pixel format.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|----------|:-------:|:-----:|:--------:|:-------:|:--------:|
| fir rust | 0.41 | 30.13 | 42.49 | 69.34 | 98.15 |
<!-- bench_compare_la32f end -->
<!-- bench_compare_rgb32f start -->
### Resize RGB32F image (F32x3) 4928x3279 => 852x567
Pipeline:
`src_image => resize => dst_image`
- Source image [nasa-4928x3279.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279.png)
has converted into RGB32F image.
- Numbers in the table mean a duration of image resizing in milliseconds.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|----------|:-------:|:-----:|:--------:|:-------:|:--------:|
| image | 16.34 | - | 67.78 | 123.04 | 180.03 |
| resize | 10.39 | 21.49 | 35.88 | 65.69 | 95.80 |
| fir rust | 1.02 | 25.55 | 45.73 | 86.30 | 128.94 |
<!-- bench_compare_rgb32f end -->
<!-- bench_compare_rgba32f start -->
### Resize RGBA32F image (F32x4) 4928x3279 => 852x567
Pipeline:
`src_image => multiply by alpha => resize => divide by alpha => dst_image`
- Source image
[nasa-4928x3279-rgba.png](https://github.com/Cykooz/fast_image_resize/blob/main/data/nasa-4928x3279-rgba.png)
- Numbers in the table mean a duration of image resizing in milliseconds.
- The `image` crate does not support multiplying and dividing by alpha channel.
- The `resize` crate does not support multiplying and dividing by alpha channel
for this pixel format.
| | Nearest | Box | Bilinear | Bicubic | Lanczos3 |
|----------|:-------:|:-----:|:--------:|:-------:|:--------:|
| fir rust | 1.20 | 50.35 | 73.55 | 118.86 | 168.11 |
<!-- bench_compare_rgba32f end -->
|
