Initial commit

.cargo/config

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+[build]
+target = "i686-pc-windows-msvc"
+rustflags = ["-C", "link-args=/debug:none"]

.gitignore

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+target/*

Cargo.toml

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+[package]
+name = "mod"
+version = "0.1.0"
+authors = ["lcdr"]
+edition = "2018"
+description = "A mod to change LU's UI scale."
+readme = "README.md"
+license = "AGPL-3.0-or-later"
+repository = "https://github.com/lcdr/ui_scaler/"
+
+[dependencies]
+winapi = { version = "0.3.9", features = ["libloaderapi", "memoryapi"] }
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+lto = true

README.md

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+A mod to change LU's UI scale.
+
+# Installation:
+
+If you haven't installed my modloader yet, install it from https://github.com/lcdr/mod_loader/releases/, following the instructions there.
+
+Download this mod from https://github.com/lcdr/ui_scaler/releases/, following the instructions there.
+
+# Usage:
+
+Open your client's boot.cfg file and add a new config entry named `UI_SCALE` with type 3 (float) and the scaling factor as the value, e.g. append `,UI_SCALE=3:2.0` to the file for x2 scaling.

src/lib.rs

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+mod patch;
+mod scale_ui;
+use scale_ui::patch_ui_scale;
+
+use winapi::{
+	shared::minwindef::{BOOL, DWORD, HINSTANCE, LPVOID, TRUE},
+	um::libloaderapi::GetModuleHandleA,
+};
+
+static mut BASE: usize = 0;
+
+#[no_mangle]
+pub extern "system" fn DllMain(
+	_dll_module: HINSTANCE,
+	call_reason: DWORD,
+	_reserved: LPVOID)
+	-> BOOL {
+	const DLL_PROCESS_ATTACH: DWORD = 1;
+
+	match call_reason {
+		DLL_PROCESS_ATTACH => init(),
+		_ => TRUE
+	}
+}
+
+fn init() -> BOOL {
+	unsafe { BASE = GetModuleHandleA(std::ptr::null()) as usize; }
+	patch_ui_scale();
+	TRUE
+}

src/patch.rs

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+use winapi::shared::minwindef::{DWORD, LPVOID};
+use winapi::um::memoryapi::VirtualProtect;
+use winapi::um::winnt::PAGE_EXECUTE_READWRITE;
+
+use crate::BASE;
+
+pub fn patch<T>(dst: usize, new: T) {
+	unsafe {
+		let dst = (dst + BASE) as LPVOID;
+		let mut old_protect: DWORD = PAGE_EXECUTE_READWRITE;
+		VirtualProtect(dst, std::mem::size_of::<T>(), PAGE_EXECUTE_READWRITE, &mut old_protect);
+		*(dst as *mut T) = new;
+		VirtualProtect(dst, std::mem::size_of::<T>(), old_protect, &mut old_protect);
+	}
+}

src/scale_ui.rs

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+use std::fs::read_to_string;
+
+use crate::patch::patch;
+
+const VIEWPORT_HEIGHT_OFFSET: usize = 0x7939ce;
+const VIEWPORT_HEIGHT_VALUE: usize = 0x7939d2;
+
+pub fn patch_ui_scale() {
+	let lnv = read_to_string("boot.cfg").expect("could not open boot.cfg");
+
+	for name_value in lnv.split(",") {
+		let name_value = name_value.trim();
+		let (name, value) = name_value.split_at(name_value.find(":").expect(&format!("malformed boot.cfg entry, colon missing: {}", name_value))+1);
+
+		if name == "UI_SCALE=3:" {
+			let scale: f32 = value.parse().expect(&format!("could not parse boot.cfg UI_SCALE value as float: {}", value));
+			let scale = 1.0 / scale;
+			patch(VIEWPORT_HEIGHT_OFFSET, 0x00_00_01_50_u32);
+			patch(VIEWPORT_HEIGHT_VALUE, scale);
+		}
+	}
+}