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StackBlur.js

StackBlur.js is a fast, almost Gaussian blur created by Mario Klingemann.

More informations: http://incubator.quasimondo.com/processing/fast_blur_deluxe.php
Algorithm: https://medium.com/better-programming/blurring-image-algorithm-example-in-android-cec81911cd5e
Demo: http://www.quasimondo.com/StackBlurForCanvas/StackBlurDemo.html

Original source:

http://www.quasimondo.com/StackBlurForCanvas/StackBlur.js

Getting Started

Standalone version

To use the standalone version,

download the latest zip from Github or clone the repository

git clone git@github.com:flozz/StackBlur.git

and include the dist/stackblur.js or dist/stackblur.min.js file in your HTML page:

<script src="StackBlur/dist/stackblur.js"></script>

Node

To use the NPM package,

install the package:

npm install --save stackblur-canvas

and require it where needed

const StackBlur = require('stackblur-canvas');

Browsers

If you are only supporting modern browsers, you may use ES6 Modules directly:

import * as StackBlur from
  './node_modules/stackblur-canvas/dist/stackblur-es.min.js';

Or, if you are using Rollup in your own project, use the node-resolve plugin, and import by just referencing the module:

import * as StackBlur from 'stackblur-canvas';

API

See also the docs in docs/jsdoc.

Image as source:

StackBlur.image(sourceImage, targetCanvas, radius, blurAlphaChannel);

sourceImage: the HTMLImageElement or its id.
targetCanvas: the HTMLCanvasElement or its id.
radius: the radius of the blur.
blurAlphaChannel: Set it to true if you want to blur a RGBA image (optional, default = false)

RGBA Canvas as source:

StackBlur.canvasRGBA(targetCanvas, top_x, top_y, width, height, radius);

targetCanvas: the HTMLCanvasElement.
top_x: the horizontal coordinate of the top-left corner of the rectangle to blur.
top_y: the vertical coordinate of the top-left corner of the rectangle to blur.
width: the width of the rectangle to blur.
height: the height of the rectangle to blur.
radius: the radius of the blur.

RGB Canvas as source:

StackBlur.canvasRGB(targetCanvas, top_x, top_y, width, height, radius);

targetCanvas: the HTMLCanvasElement.
top_x: the horizontal coordinate of the top-left corner of the rectangle to blur.
top_y: the vertical coordinate of the top-left corner of the rectangle to blur.
width: the width of the rectangle to blur.
height: the height of the rectangle to blur.
radius: the radius of the blur.

RGBA ImageData as source:

StackBlur.imageDataRGBA(imageData, top_x, top_y, width, height, radius);

imageData: the canvas' ImageData.
top_x: the horizontal coordinate of the top-left corner of the rectangle to blur.
top_y: the vertical coordinate of the top-left corner of the rectangle to blur.
width: the width of the rectangle to blur.
height: the height of the rectangle to blur.
radius: the radius of the blur.

RGB ImageData as source:

StackBlur.imageDataRGB(imageData, top_x, top_y, width, height, radius);

imageData: the canvas' ImageData.
top_x: the horizontal coordinate of the top-left corner of the rectangle to blur.
top_y: the vertical coordinate of the top-left corner of the rectangle to blur.
width: the width of the rectangle to blur.
height: the height of the rectangle to blur.
radius: the radius of the blur.

Hacking

Building

This library is built using Rollup. If you change something in the src/ folder, use the following command to re-build the files in the dist/ folder:

npm run rollup

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