paste

Paste a region from one ImageData to another with optional composite mode

With the default mode (normal) the pixels copied from the source image are alpha composited with the pixels in the destination image

Composite modes include:

darken, difference, exclusion, hardLight, lighten, multiply, normal, overlay, screen

install

npm install @rgba-image/paste

usage

Pastes one image over another:

const { paste } = require( '@rgba-image/copy' )

paste( source, dest )

Paste from a source region to a location on the destination image:

const sourceX = 10
const sourceY = 20
const sourceWidth = 50
const sourceHeight = 100
const destX = 30
const destY = 40

paste( source, dest, sourceX, sourceY, sourceWidth, sourceHeight, destX, destY )

Paste with the source at half opacity:

const sourceX = 10
const sourceY = 20
const sourceWidth = 50
const sourceHeight = 100
const destX = 30
const destY = 40
const alpha = 0.5

paste( 
  source, dest, sourceX, sourceY, sourceWidth, sourceHeight, destX, destY, alpha
)

Paste with the source at normal opacity using screen composite mode:

const sourceX = 10
const sourceY = 20
const sourceWidth = 50
const sourceHeight = 100
const destX = 30
const destY = 40
const alpha = 1
const mode = 'screen'

paste( 
  source, dest, sourceX, sourceY, sourceWidth, sourceHeight, destX, destY, 
  alpha, mode
)

Arguments following dest are optional

If omitted:

sourceX = 0
sourceY = 0
sourceWidth = source.width - sourceX
sourceHeight = source.height - sourceY
destX = 0
destY = 0
alpha = 1
mode = 'normal'

Also exported for convenience:

pasteDarken, pasteDifference, pasteExclusion, pasteHardLight, pasteLighten, pasteMultiply, pasteNormal, pasteOverlay, pasteScreen

License

MIT License

Copyright (c) 2018 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.