PNG Chunks

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While trying another project, I found that I do not

understand PNG. As for that, I started writing a PNG TChunk investigating 

in  Vcl.Imaging.pngimage and found out that it lacks

many chunks. 

I used this pngnet-code-r26-trunk.zip c++ program as a reference and more.

So my basic question is (if anyone knows) that

Vcl.Imaging.pngimage has a full PNG specification, and

if it lacks more chunks, does any other PAS PNG file have a full spec?

Any recommendation?

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This is what I wrote

[Anders Melander 2073]

I doubt that you will find anything that implements everything since there's really no need or practical use for that.

 

You can have a look at the PNG implementation in Graphics32:

  https://github.com/graphics32/graphics32/blob/master/Source/GR32_PortableNetworkGraphic.pas

I don't know if it covers more or less of the specs than TPNGImage but at least it's fully extensible so you can add anything that it's missing if you want to.

Edited August 15 by Anders Melander

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GR32_PortableNetworkGraphic.pas seems to be more extensive