[Feature Request] Add "Nearest Neighbor" interpolation option for Scaled Resolution mode

[Flen-Plnens]

Device / Environment:

I am running Termux-X11 on a high-resolution tablet (Xiaomi Pad 6, 2880x1800).

Problem Description:

• Native 2880x1800: Performance is sluggish due to high GPU load.
• Scaled 1440x900 (150% or 200% scale): Performance is great, but the image is blurry because the current scaling algorithm seems to be Bilinear/Linear.

Requested Feature:

Please add an option in Preferences -> Output display resolution mode to toggle the scaling algorithm. specifically, a "Nearest Neighbor" (Integer Scaling) option is needed.

Workarounds Tried:

• Changing Android system resolution via ADB (wm size): Caused system-wide blur and broke full-screen gestures on MIUI.
• Changing Xfce DPI: Solves UI size but does not reduce GPU rendering load.

Why This Feature Matters:

Adding Nearest Neighbor interpolation would allow users with high-PPI screens (tablets/phones) to run desktops at 1/2 resolution (e.g. 1440x900 on a 2880x1800 screen) with crisp pixels and high performance, making it perfect for emulating retro games or reducing render overhead.

[robertkirkman]

@Flen-Plnens I have managed to create a way of doing it, but unfortunately, my version is not very good and it has some bugs. If you know how to test Termux:X11 PRs then you can test it though and check if it helps you yet. It does sort of work.

Unfortunately, one of the bugs is that when you first switch the setting from Bilinear to Nearest, in my version the change does not dynamically apply properly, so it's currently necessary to go to the Android Settings page of Termux:X11 and touch "force stop" on it, and then open it again, and then it will be switched to Nearest.

I don't know how to fix that yet but I may keep trying.