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3 Commits

Author SHA1 Message Date
Nico Weber
7296b0fa43 LibGfx/JPEG2000: Implement tag trees 
A tag tree is a data structure used for deserializing JPEG2000
packet headers.

We don't use them for anything yet, except from tests.

The implementation feels a bit awkward to me, but we can always polish
it later.

The spec thankfully includes two concrete examples. The code is
correct enough to pass those -- I added them as test.
 2024-04-16 00:40:16 +02:00
Nico Weber
a92d887ee3 LibGfx/JPEG2000: Read file structure 
This is enough for `file` to print the dimensions of .jp2 / .jpx files,
and for `icc` to print color profile information embedded in the
'colr' box.
 2024-03-25 20:35:00 +01:00
Nico Weber
1ab28276f6 LibGfx: Add the start of a JPEG2000 loader 
JPEG2000 is the last image format used in PDF filters that we
don't have a loader for. Let's change that.

This adds all the scaffolding, but no actual implementation yet.
 2024-03-25 20:35:00 +01:00