423389 TIFF: support signed integer formats
This MR enables support for signed integer TIFF files.
I've not been able to resize, trim, or generate a signed integer image using ImageMagick or Pillow, hence I've not added a test to the suite. (Please feel free to push such an addition to the MR!)
Test Plan
Load the file attached in the bug report. Check that it displays as a grayscale image.
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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.