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LibGfx+icc: Read cicpType

This is a very new tag used for HDR content. The only files I know that
use it are the jpegs on https://ccameron-chromium.github.io/hdr-jpeg/
But they have an invalid ICC creation date, so `icc` can't process them.
(Commenting out the check for that does allow to print them.)

If the CIPC tag is present, it takes precedence about the actual data
in the profile and from what I understand, the ICC profile is
basically ignored. See https://www.color.org/events/HDR_experts.xalter
for background, in particular
https://www.color.org/hdr/02-Luke_Wallis.pdf (but the other talks
are very interesting too).

(PNG also has a cICP chunk that's supposed to take precedence over
iCCP.)
This commit is contained in:
Nico Weber 2023-02-07 21:35:14 -05:00 committed by Linus Groh
parent a434b89521
commit e8bbb3d915
5 changed files with 64 additions and 2 deletions

View file

@ -572,6 +572,8 @@ ErrorOr<NonnullRefPtr<TagData>> Profile::read_tag(ReadonlyBytes bytes, u32 offse
auto type = tag_type(tag_bytes);
switch (type) {
case CicpTagData::Type:
return CicpTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
case CurveTagData::Type:
return CurveTagData::from_bytes(tag_bytes, offset_to_beginning_of_tag_data_element, size_of_tag_data_element);
case Lut16TagData::Type: