The phone magnifies the 600-high 40250 UI about 1.8x, so the 1x window art
and icons look soft next to the oversampled text. scripts/build_hd_ui.py
upscales every UI image the zh client loads (d:/ymir work/ui/, icon/,
locale/zh/) with realesrgan-x4plus, reduces it to 2x and back-projects the
residual so the board grain the network denoises away comes back; the host
uploads a texture found in hd_ui.pak in place of the pack file. Layout,
sizes and UVs stay the engine's 1x ones. MT_HD_UI=0 disables it; the pak
(135 MB, Ymir art) is built into the client dir and synced to the phone,
never committed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
