Operation()source/Raster.js, line 21
A function that takes an array of input data, performs some operation, and returns an array of output data. For
pixeltype operations, the function will be called with an array of pixels, where each pixel is an array of four numbers (
[r, g, b, a]) in the range of 0 - 255. It should return a single pixel array. For
'image'type operations, functions will be called with an array of
https://developer.mozilla.org/en-US/docs/Web/API/ImageDataand should return a single
https://developer.mozilla.org/en-US/docs/Web/API/ImageData. The operations are called with a second "data" argument, which can be used for storage. The data object is accessible from raster events, where it can be initialized in "beforeoperations" and accessed again in "afteroperations".
Name Type Argument Default Description
Input sources or layers. For vector data, use an VectorImage layer.
Raster operation. The operation will be called with data from input sources and the output will be assigned to the raster source.
Functions that will be made available to operations run in a worker.
By default, operations will be run in a single worker thread. To avoid using workers altogether, set
threads: 0. For pixel operations, operations can be run in multiple worker threads. Note that there is additional overhead in transferring data to multiple workers, and that depending on the user's system, it may not be possible to parallelize the work.
Operation type. Supported values are
'image'. By default,
'pixel'operations are assumed, and operations will be called with an array of pixels from input sources. If set to
'image', operations will be called with an array of ImageData objects from input sources.