Reduce bundle size

[NicolasRannou]

Lots of code from THREEJS is not shaked-out and OpenJPEG is way too big.

> yarn analyze:ami:prod 

[NicolasRannou]

https://github.com/FNNDSC/ami/pull/326

[NicolasRannou]

[NicolasRannou]

Pako is being included 2 times. (-200kB)

OpenJPEG is huge. Can we get rid of JPX/JPEG decoder then?

Freesurder segmentation preset should not be part of the bundle. (-100kB)

[JSibir]

OpenJPEG can be excluded from package. If users want to work with J2K, AMI documentation will force them to load OpenJPEG script before AMI, like it done in Cornerstone.

[NicolasRannou]

Interesting - do you have a link to where they would do in Cornerstone?

In AMI, the data "parsers" and "decoders" is the most expensive thing

[JSibir]

https://github.com/cornerstonejs/cornerstoneWADOImageLoader/blob/master/docs/Codecs.md https://rawgit.com/cornerstonejs/cornerstoneWADOImageLoader/master/examples/dicomfile/index.html L112-L133

[NicolasRannou]

Thanks that's useful!

What I am thinking now is that: 1- load all codecs on demand in ami (somehow)

// in dicom parser
if (j2k) {
  // get j2k decoder through ajax file, then when loaded, continue
}

or 2- provide codecs in the loader/parser constructors

const volumeLoader = new VolumeLoader({
  decoders:
  { 
    j2k: J2K, // J2K constructor
  }
})