From ddd9a27cdb48be5bf7305613746da8a2c3f92d24 Mon Sep 17 00:00:00 2001
From: artdeell <ultramaksim@gmail.com>
Date: Sat, 16 Jan 2021 21:48:25 +0300
Subject: [PATCH] Add automatic memory adjuster

---
 .../main/java/net/kdt/pojavlaunch/Tools.java  |  3 ++-
 .../net/kdt/pojavlaunch/utils/JREUtils.java   | 26 +++++++++++++++++--
 .../src/main/res/values/strings.xml           |  3 +++
 .../src/main/res/xml/pref_main.xml            |  5 ++++
 4 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
index d600cbc8d..72097087a 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Tools.java
@@ -21,6 +21,7 @@ import net.kdt.pojavlaunch.utils.*;
 import net.kdt.pojavlaunch.value.*;
 import org.lwjgl.glfw.*;
 import android.view.*;
+import android.widget.Toast;
 
 public final class Tools
 {
@@ -103,7 +104,7 @@ public final class Tools
         ctx.appendlnToLog("full args: "+javaArgList.toString());
         JREUtils.launchJavaVM(ctx, javaArgList);
     }
-    
+
     public static void getJavaArgs(Context ctx, List<String> javaArgList) {
         List<String> overrideableArgList = new ArrayList<String>();
 
diff --git a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java
index 62b7864aa..38cd24cd6 100644
--- a/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java
+++ b/app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java
@@ -4,6 +4,7 @@ import android.app.*;
 import android.content.*;
 import android.system.*;
 import android.util.*;
+import android.widget.Toast;
 
 import androidx.annotation.Nullable;
 
@@ -264,7 +265,20 @@ public class JREUtils
         List<String> javaArgList = new ArrayList<String>();
         javaArgList.add(Tools.DIR_HOME_JRE + "/bin/java");
         Tools.getJavaArgs(ctx, javaArgList);
-
+        if(LauncherPreferences.DEFAULT_PREF.getBoolean("autoRam",true)) {
+            ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
+            ((ActivityManager)ctx.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryInfo(mi);
+            purgeArg(javaArgList,"-Xms");
+            purgeArg(javaArgList,"-Xmx");
+            javaArgList.add("-Xms"+((mi.availMem / 1048576L)-50)+"M");
+            javaArgList.add("-Xmx"+((mi.availMem / 1048576L)-50)+"M");
+            ctx.runOnUiThread(new Runnable() {
+                public void run() {
+                    Toast.makeText(ctx, ctx.getString(R.string.autoram_info_msg,((mi.availMem / 1048576L)-50)), Toast.LENGTH_SHORT).show();
+                }
+            });
+            System.out.println(javaArgList);
+        }
         javaArgList.addAll(args);
         
         // For debugging only!
@@ -275,6 +289,7 @@ public class JREUtils
         }
         ctx.appendlnToLog("Executing JVM: \"" + sbJavaArgs.toString() + "\"");
 */
+
         JREUtils.setJavaEnvironment(ctx, null);
         JREUtils.initJavaRuntime();
         JREUtils.chdir(Tools.DIR_GAME_NEW);
@@ -300,7 +315,14 @@ public class JREUtils
         }
         return exitCode;
     }
-
+    private static void purgeArg(List<String> argList, String argStart) {
+        for(int i = 0; i < argList.size(); i++) {
+            final String arg = argList.get(i);
+            if(arg.startsWith(argStart)) {
+                argList.remove(i);
+            }
+        }
+    }
     public static native int chdir(String path);
     public static native boolean dlopen(String libPath);
     public static native void redirectLogcat();
diff --git a/app_pojavlauncher/src/main/res/values/strings.xml b/app_pojavlauncher/src/main/res/values/strings.xml
index 3dfe54018..14adaf6af 100644
--- a/app_pojavlauncher/src/main/res/values/strings.xml
+++ b/app_pojavlauncher/src/main/res/values/strings.xml
@@ -221,4 +221,7 @@
     <string name="main_nocrash">No crash detected</string>
     <string name="main_nolog">No log.</string>
     <string name="main_no_news_feed">Failed to fetch the news feed !</string>
+    <string name="auto_ram_subtitle">Enables automatic RAM adjuster</string>
+    <string name="auto_ram_title">Auto RAM</string>
+    <string name="autoram_info_msg">Memory set to %d MB</string>
 </resources>
diff --git a/app_pojavlauncher/src/main/res/xml/pref_main.xml b/app_pojavlauncher/src/main/res/xml/pref_main.xml
index 1e955686c..7ade628f5 100644
--- a/app_pojavlauncher/src/main/res/xml/pref_main.xml
+++ b/app_pojavlauncher/src/main/res/xml/pref_main.xml
@@ -32,6 +32,11 @@
             android:summary="@string/mcl_setting_subtitle_hide_sidebar"
             android:title="@string/mcl_setting_title_hide_sidebar"
             app2:icon="@drawable/hide_sidebar" />
+        <androidx.preference.SwitchPreferenceCompat
+            android:defaultValue="true"
+            android:key="autoRam"
+            android:summary="@string/auto_ram_subtitle"
+            android:title="@string/auto_ram_title" />
 
         <EditTextPreference
             android:dialogTitle="@string/mcl_setting_title_javaargs"