Big image cover

[suslik-50]

Summary

Added the ability to select the size of the book cover image when opening the book and in sleep mode

[pliashkov-spm]

Hey, thanks for the PR! The idea of fitting covers to the full screen is nice.

However there's a fundamental problem with the approach. Right now covers go through a conversion pipeline (JPEG/PNG → dithered 2-bit BMP) at 450x750. Your code then takes that already-dithered BMP and upscales it at render time with nearest-neighbor. Scaling a dithered image like that produces visible blocky artifacts on the e-ink display — the dithering pattern was computed for 1:1 pixel output.

The fix should happen in the conversion layer, not the renderer. The ImageConvertConfig already has maxWidth/maxHeight — for aspect-fit mode we just need to pass screen dimensions (480x800) there, so the dithering is calculated at the correct output size. No need for a new drawBitmapBySize function at all.

Would you like to rework this using the conversion pipeline approach? Happy to help if you have questions about the codebase.