Enhancement: add tiled Buffer (and Stream) output

[lovell]

Will use vips_dzsave_buffer, forces container property to have a value of "zip".

Requires exposing the basename property (libvips default is "undefined").

:point_down: PROPOSED API - NOT YET AVAILABLE

const zipFileWithTiles = await sharp(input)
  .tile({ basename: "tiles" })
  .toBuffer();

const iiififier = sharp().tile({ layout: "iiif" });

readableStream
  .pipe(iiififier)
  .pipe(writeableStream);

:point_up: PROPOSED API - NOT YET AVAILABLE

[Talbot3]

Thank your tips.here is my code that run pass.

const img = require('sharp');
const fs = require('fs');
const imgStream = img().tile().toFormat('jpg').resize(320, 240);
console.log(imgStream.format)
const path = require('path');
let rStream = fs.createReadStream(path.join(__dirname, 'test.jpg').toString());
let wStream = fs.createWriteStream('./test.haha.jpg');
rStream.pipe(imgStream).pipe(wStream);

[lovell]

@Talbot3 This future possible enhancement is about Streaming a zip file containing multiple tile-based deep zoom (image pyramid) images with complete directory structure. The use of toFormat('jpg') in your sample code means it will only output one image.

[nikolay-atypon]

Any progress on this? Seems like a very useful feature.

[manfwh]

@lovell Is this ready to use?

[lovell]

Commit https://github.com/lovell/sharp/commit/b46ab510da4358ff6de32b8d23bc29882b1151af adds support for tile output via Stream and Buffer. This will be in v0.31.0.

[lovell]

v0.31.0 now available with this improvement.