移动端界面大小设置：默认 600 逻辑高，系统选项可选 600/700/800

Android 上 40250 界面原先固定按 800 逻辑像素高排版，弹窗文字在手机上只有约 1 mm 高。
- UIScaleMode.h + host ui_scale.cpp：逻辑高度来自保存的设置（默认 600），ui_height.cfg 保存，下次启动生效；
  桌面可用 MT_UI_HEIGHT 测试
- app.GetUIHeight/GetAppliedUIHeight/SetUIHeight
- mt_uiscale PORT 模块：系统选项对话框加高一行，"界面大小 大/中/小"，修改后聊天提示重启生效

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/platform/EterBase/UIScaleMode.h

@@ -0,0 +1,45 @@
+#pragma once
+// PORT: the player's UI size setting (system option dialog, app.Get/SetUIHeight), shared between the
+// script thread and the host (src/host/ui_scale.cpp), which lays the 40250 UI out that many logical
+// pixels high and scales it onto the screen, and saves the choice. 40250 has no counterpart: the PC
+// client's UI pixels were screen pixels. A lower height draws every window and text larger.
+
+#include <atomic>
+
+namespace MtUIScale {
+
+// The choices, lowest (largest UI) first. 600 is the 40250 minimum resolution's height: the inventory
+// and character windows need about that much.
+inline constexpr int c_aiHeights[] = {600, 700, 800};
+inline constexpr int c_iDefaultHeight = 600;
+
+inline bool IsValid(int height)
+{
+	for (int choice : c_aiHeights)
+		if (choice == height)
+			return true;
+	return false;
+}
+
+// The height the running client lays out at (0 = the setting is unavailable: a desktop window lays
+// out at its own size). Set once by the host at startup; a new choice applies at the next start.
+inline std::atomic<int>& Applied()
+{
+	static std::atomic<int> height{0};
+	return height;
+}
+
+// The player's choice, saved by the host when it changes.
+inline std::atomic<int>& Chosen()
+{
+	static std::atomic<int> height{0};
+	return height;
+}
+
+inline void Set(int height)
+{
+	if (IsValid(height) && Applied().load(std::memory_order_relaxed))
+		Chosen().store(height, std::memory_order_relaxed);
+}
+
+} // namespace MtUIScale

src/platform/ScriptLib/PythonBoot.cpp

@@ -877,6 +877,7 @@ namespace PythonBoot
 #include "AutoHuntScript.inc"
 #include "RegisterScript.inc"
 #include "FrameRateOptionScript.inc"
+#include "UIScaleOptionScript.inc"
 #include "InventoryPagesScript.inc"
 
 static void install_script_module(const char* c_szModule, const char* c_szScript)
@@ -934,6 +935,7 @@ bool RunMainScript(const char* lpCmdLine, std::string* error)
 		install_script_module("mt_autohunt", c_szAutoHuntScript);
 		install_script_module("mt_register", c_szRegisterScript);
 		install_script_module("mt_framerate", c_szFrameRateOptionScript);
+		install_script_module("mt_uiscale", c_szUIScaleOptionScript);
 		install_script_module("mt_inventory", c_szInventoryPagesScript);
 	}
 	return true;

src/platform/ScriptLib/UIScaleOptionScript.inc

@@ -0,0 +1,92 @@
+// The UI-size row of the system option dialog (PORT; 40250 has no counterpart, its UI pixels were screen
+// pixels), run by PythonBoot::RunMainScript as module mt_uiscale after mt_framerate. It wraps
+// uiSystemOption.OptionDialog's __Load, grows the dialog by one row below the frame-rate row and fills it
+// in the same style. The value is app.Get/SetUIHeight (platform/EterBase/UIScaleMode.h): the logical
+// height the host lays the UI out at, saved by the host and applied at the next start. The row is only
+// added where the setting exists (Android, or MT_UI_HEIGHT on the desktop).
+// Strings are UTF-8 here and go through player.AutoHuntLocalize into the locale's code page.
+static const char c_szUIScaleOptionScript[] = R"PY(# -*- coding: utf-8 -*-
+import app
+import chat
+import player
+import ui
+import uiSystemOption
+
+L = player.AutoHuntLocalize
+
+SMALL_BUTTON = "d:/ymir work/ui/public/small_button_%02d.sub"
+ROW_Y = 235
+ROW_H = 25
+HEIGHTS = (600, 700, 800)
+HEIGHT_TEXTS = ("大", "中", "小")
+
+
+def _Refresh(buttons):
+	height = app.GetUIHeight()
+	for i in xrange(len(buttons)):
+		if HEIGHTS[i] == height:
+			buttons[i].Down()
+		else:
+			buttons[i].SetUp()
+
+
+def _Select(buttons, height):
+	changed = height != app.GetUIHeight()
+	app.SetUIHeight(height)
+	_Refresh(buttons)
+	if changed:
+		if height == app.GetAppliedUIHeight():
+			chat.AppendChat(chat.CHAT_TYPE_INFO, L("界面大小已恢复为当前设置"))
+		else:
+			chat.AppendChat(chat.CHAT_TYPE_INFO, L("界面大小将在重新启动游戏后生效"))
+
+
+def _Attach(dialog):
+	if not app.GetAppliedUIHeight():
+		return
+	board = dialog.GetChild("board")
+	width = dialog.GetWidth()
+	height = dialog.GetHeight() + ROW_H
+	dialog.SetSize(width, height)
+	board.SetSize(width, height)
+	dialog.SetCenterPosition()
+
+	label = ui.TextLine()
+	label.SetParent(board)
+	label.SetPosition(30, ROW_Y + 2)
+	label.SetText(L("界面大小"))
+	label.Show()
+
+	buttons = []
+	for i in xrange(len(HEIGHTS)):
+		button = ui.RadioButton()
+		button.SetParent(board)
+		button.SetUpVisual(SMALL_BUTTON % 1)
+		button.SetOverVisual(SMALL_BUTTON % 2)
+		button.SetDownVisual(SMALL_BUTTON % 3)
+		button.SetPosition(110 + 50 * i, ROW_Y)
+		button.SetText(L(HEIGHT_TEXTS[i]))
+		button.SetEvent(lambda height=HEIGHTS[i]: _Select(buttons, height))
+		button.Show()
+		buttons.append(button)
+	_Refresh(buttons)
+
+	dialog.mtUIScaleLabel = label
+	dialog.mtUIScaleButtons = buttons
+
+
+def __Install():
+	load = uiSystemOption.OptionDialog._OptionDialog__Load
+
+	def Load(self):
+		load(self)
+		try:
+			_Attach(self)
+		except:
+			import dbg
+			dbg.TraceError("mt_uiscale: cannot add the UI size row")
+
+	uiSystemOption.OptionDialog._OptionDialog__Load = Load
+
+__Install()
+)PY";