458054 Fix JPEG-XL HDR support
The version of libjxl we were using had broken support for linear HDR, and updating it revealed some last-minute ABI breaks upstream.
To fix it, I'm updating libjxl to the 0.7 RC and highway to latest main.
I've also fixed an import error, where I didn't account for 16-bit float nor if the requisite OpenEXR support was in place.
Test Plan
Build Krita and run the new tests.
Formalities Checklist
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I confirmed this builds. -
I confirmed Krita ran and the relevant functions work. -
I tested the relevant unit tests and can confirm they are not broken. (If not possible, don't hesitate to ask for help!) -
I made sure my commits build individually and have good descriptions as per KDE guidelines. -
I made sure my code conforms to the standards set in the HACKING file. -
I can confirm the code is licensed and attributed appropriately, and that unattributed code is mine, as per KDE Licensing Policy.
Edited by Amy spark