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[Feature] Export PNG with multiple DAT chunks #385

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VRPunk9036 wants to merge 2 commits into pngjs:main from VRPunk9036:export-into-multiple-datachunks

VRPunk9036 commented Mar 23, 2024

This allows the data in the PNG to be split up over multiple DAT chunks.

For my use case I used the option maximumDataChunkSize: 32768

let outputBuffer = PNG.sync.write(fullPunksPNG, {deflateStrategy: 0, filterType: 0, maximumDataChunkSize: 32768});

Motivation

I'm trying to recreate a PNG exactly how it was from pixel data. I noticed the exported PNG using pngjs had a single DAT chunk while the original file I try to recreate has multiple DAT chunks. With this fix I managed to make an exact replica of the original using the pixel data and the right compression settings.

VRPunk added 2 commits

March 23, 2024 08:58


          maximumDataChunkSize property for packer, allows to split the resulti…

868dfdc

…ng PNG up in multiple DAT chunks


          ran prettier

ebd6f16

Author

VRPunk9036 commented Mar 23, 2024

ping @lukeapage , not sure if I have to ping but I'm quite excited about having a PR 😅

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