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https://github.com/JamieMason/blurhash-to-css
Convert BlurHashes to CSS Objects using TypeScript, Rust, and WebAssembly.
https://github.com/JamieMason/blurhash-to-css
blurhash rust typescript wasm webperf
Last synced: about 2 months ago
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Convert BlurHashes to CSS Objects using TypeScript, Rust, and WebAssembly.
- Host: GitHub
- URL: https://github.com/JamieMason/blurhash-to-css
- Owner: JamieMason
- Created: 2021-02-17T08:28:05.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-02-16T23:28:14.000Z (over 1 year ago)
- Last Synced: 2024-07-10T10:59:05.190Z (2 months ago)
- Topics: blurhash, rust, typescript, wasm, webperf
- Language: TypeScript
- Homepage:
- Size: 248 KB
- Stars: 55
- Watchers: 3
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
Awesome Lists containing this project
README
# blurhash-to-css
> Converts a [BlurHash](https://blurha.sh) to a [CSS Object](https://developer.mozilla.org/en-US/docs/Web/API/ElementCSSInlineStyle/style) using [TypeScript](https://www.typescriptlang.org/), [Rust](https://www.rust-lang.org/), and [WebAssembly](https://github.com/rustwasm/wasm-pack).
[](https://www.npmjs.com/package/blurhash-to-css) [](https://www.npmjs.com/package/blurhash-to-css) [](https://github.com/JamieMason) [](https://twitter.com/fold_left)
## 🌩 Installation
```
npm install blurhash-to-css
```
## 📣 Summary
[BlurHash](https://blurha.sh) is a compact representation of a placeholder for an image, which makes it a great option to [improve perceived load times](https://blog.imgix.com/2021/01/26/blurhash). But, a BlurHash is rendered using a `` element, which means client-side JavaScript is needed on the critical path when loading our application.
This tool creates the same visual effect using CSS, which can be rendered on the Server without any dependency on client-side JavaScript.
An example can be seen at https://blurhash-to-css.vercel.app and the source is in this repo at [`/example`](https://github.com/JamieMason/blurhash-to-css/tree/main/example).
## 🤝 Credit
- The image buffer to CSS conversion is a port to Rust of [this Script](https://github.com/joe-bell/plaiceholder/blob/d09df807df5d11c5d91a7971c2f90e2faa845843/packages/css/src/index.ts#L18-L51) originally by [**@joe-bell**](https://github.com/joe-bell) for [plaiceholder: Beautiful image placeholders, without the hassle](https://plaiceholder.co/).
- A lot of help came from the source code in [wasm-image](https://github.com/peerigon/wasm-image) by [**@acidicX**](https://github.com/acidicX).
## 🕹 Usage
```ts
import { blurhashToCss } from 'blurhash-to-css';
const css = blurhashToCss('eCF6B#-:0JInxr?@s;nmIoWUIko1%NocRk.8xbIUaxR*^+s;RiWAWU');
```
↓↓↓↓↓
```json
{
"backgroundImage": "linear-gradient(90deg, rgb(139,153,96) 10%,rgb(153,160,118) 10% 20%,rgb(170,172,142) 20% 30%,rgb(177,180,151) 30% 40%,rgb(174,180,146) 40% 50%,rgb(162,172,130) 50% 60%,rgb(148,162,114) 60% 70%,rgb(136,150,104) 70% 80%,rgb(131,145,95) 80% 90%,rgb(130,144,91) 90% 100%),linear-gradient(90deg, rgb(109,129,65) 10%,rgb(117,131,80) 10% 20%,rgb(130,138,101) 20% 30%,rgb(142,148,113) 30% 40%,rgb(146,150,114) 40% 50%,rgb(136,144,103) 50% 60%,rgb(116,130,88) 60% 70%,rgb(102,119,75) 70% 80%,rgb(104,118,71) 80% 90%,rgb(112,123,72) 90% 100%),linear-gradient(90deg, rgb(110,122,70) 10%,rgb(114,122,85) 10% 20%,rgb(126,129,106) 20% 30%,rgb(143,140,122) 30% 40%,rgb(151,147,128) 40% 50%,rgb(144,142,122) 50% 60%,rgb(123,126,107) 60% 70%,rgb(106,111,90) 70% 80%,rgb(108,109,83) 80% 90%,rgb(118,117,83) 90% 100%),linear-gradient(90deg, rgb(134,133,102) 10%,rgb(141,138,120) 10% 20%,rgb(155,150,144) 20% 30%,rgb(172,164,161) 30% 40%,rgb(179,173,168) 40% 50%,rgb(173,168,162) 50% 60%,rgb(156,151,146) 60% 70%,rgb(137,132,127) 70% 80%,rgb(127,124,110) 80% 90%,rgb(128,124,101) 90% 100%),linear-gradient(90deg, rgb(116,124,95) 10%,rgb(125,129,112) 10% 20%,rgb(143,141,135) 20% 30%,rgb(160,156,153) 30% 40%,rgb(169,164,160) 40% 50%,rgb(165,161,155) 50% 60%,rgb(148,145,141) 60% 70%,rgb(124,125,118) 70% 80%,rgb(107,110,97) 80% 90%,rgb(99,106,82) 90% 100%),linear-gradient(90deg, rgb(95,105,51) 10%,rgb(99,105,66) 10% 20%,rgb(110,111,88) 20% 30%,rgb(125,122,107) 30% 40%,rgb(136,131,115) 40% 50%,rgb(134,129,111) 50% 60%,rgb(120,116,98) 60% 70%,rgb(97,97,77) 70% 80%,rgb(78,84,51) 80% 90%,rgb(70,78,30) 90% 100%),linear-gradient(90deg, rgb(109,106,21) 10%,rgb(109,104,44) 10% 20%,rgb(112,104,67) 20% 30%,rgb(122,109,83) 30% 40%,rgb(131,114,88) 40% 50%,rgb(130,112,83) 50% 60%,rgb(119,103,70) 60% 70%,rgb(104,91,51) 70% 80%,rgb(93,84,34) 80% 90%,rgb(92,84,24) 90% 100%)",
"backgroundPosition": "0 0 ,0 16.666666666666664%,0 33.33333333333333%,0 50%,0 66.66666666666666%,0 83.33333333333334%,0 100%",
"backgroundSize": "100% 14.285714285714286%",
"backgroundRepeat": "no-repeat",
"filter": "blur(24px)",
"transform": "scale(1.2)"
}
```
To use this a CommonJS project, you should destructure it like so:
```ts
const { blurhashToCss } = require('blurhash-to-css');
```
## 🛠 Options
### `blurhash` (required)
A small string (or array of strings) generated to represent a blurry version of an image which will download sometime soon. Have a play around on [BlurHash](https://blurha.sh), [plaiceholder.co](https://plaiceholder.co/), and have a read of [BlurHash for imgix: An Alternative to Generic Image Placeholders](https://blog.imgix.com/2021/01/26/blurhash) to try them out and find out more.
### `width` and `height` (optional)
The BlurHash is decoded into a 10 x 10 image by default, you can make this larger and it will look more like the final image, but it will also generate a lot more CSS.
```ts
const css = blurhashToCss('LEHLh[WB2yk8pyoJadR*.7kCMdnj', {
height: 30,
width: 30,
});
```