create-image

Create an RGBA image compatible with the ImageData Web API interface

The image will be filled with transparent black - [ 0, 0, 0, 0 ]

All fields are readonly:

{
  width: number
  height: number
  data: Uint8ClampedArray
}

If the ImageData constructor is found in the global object, eg in the browser or with a patched global in node, it will return an instance of that constructor, otherwise it will return a plain javascript object

install

npm install @rgba-image/create-image

usage

const { createImage } = require( '@rgba-image/create-image' )

const imageData = createImage( 300, 150 )

Populate from an existing Uint8ClampedArray (must be width * height * 4 in length):

const imageData = createImage( 300, 150, data )

This module also provides CreateImageFactory, so you can create a createImage function which fills the initial data with a different color, eg to emulate ImageData in the browser, which fills the image with opaque black:

const { CreateImageFactory } = require( '@rgba-image/create-image' )

const createImage = CreateImageFactory( [ 0, 0, 0, 255 ] )

const imageData = createImage( 300, 150 )

You can also create images with a different number of channels, but these will not be compatible with other modules in rgba-image:

const { CreateImageFactory } = require( '@rgba-image/create-image' )

const rgbChannels = 3

const createRgbImage = CreateImageFactory( [ 0, 0, 0 ], rgbChannels )

const imageData = createImage( 300, 150 )

license

MIT License

Copyright (c) 2021 Nik Coughlin

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.