Android: Detect and report power save mode.

This shows a message when it's on, or when power drops to low.

Core/Core.cpp

@@ -56,9 +56,10 @@ static bool windowHidden = false;
 static double lastActivity = 0.0;
 static double lastKeepAwake = 0.0;
 static GraphicsContext *graphicsContext;
+static bool powerSaving = false;
 
 void Core_SetGraphicsContext(GraphicsContext *ctx) {
-  graphicsContext = ctx;
+	graphicsContext = ctx;
 }
 
 void Core_NotifyWindowHidden(bool hidden) {
@@ -120,6 +121,14 @@ void Core_WaitInactive(int milliseconds) {
 	}
 }
 
+void Core_SetPowerSaving(bool mode) {
+	powerSaving = mode;
+}
+
+bool Core_GetPowerSaving() {
+	return powerSaving;
+}
+
 bool UpdateScreenScale(int width, int height, bool smallWindow) {
 	g_dpi = 72;
 	g_dpi_scale = 1.0f;

Core/Core.h

@@ -52,3 +52,6 @@ bool UpdateScreenScale(int width, int height, bool smallWindow);
 // Don't run the core when minimized etc.
 void Core_NotifyWindowHidden(bool hidden);
 void Core_NotifyActivity();
+
+void Core_SetPowerSaving(bool mode);
+bool Core_GetPowerSaving();

UI/EmuScreen.cpp

@@ -196,6 +196,11 @@ void EmuScreen::bootComplete() {
 		}
 	}
 
+	if (Core_GetPowerSaving()) {
+		I18NCategory *sy = GetI18NCategory("System");
+		osm.Show(sy->T("WARNING: Battery save mode is on"), 2.0f, 0xFFFFFF, -1, true, "core_powerSaving");
+	}
+
 	System_SendMessage("event", "startgame");
 }
 

UI/NativeApp.cpp

@@ -784,6 +784,14 @@ void HandleGlobalMessage(const std::string &msg, const std::string &value) {
 		// Show for the same duration as the preview.
 		osm.Show(msg, 2.0f, 0xFFFFFF, -1, true, "savestate_slot");
 	}
+	if (msg == "core_powerSaving") {
+		if (value != "false") {
+			I18NCategory *sy = GetI18NCategory("System");
+			osm.Show(sy->T("WARNING: Battery save mode is on"), 2.0f, 0xFFFFFF, -1, true, "core_powerSaving");
+		}
+
+		Core_SetPowerSaving(value != "false");
+	}
 }
 
 void NativeUpdate(InputState &input) {

android/AndroidManifest.xml

@@ -96,6 +96,14 @@
             </intent-filter>
         </activity>
 
+        <receiver android:name=".PowerSaveModeReceiver">
+            <intent-filter>
+                <action android:name="android.os.action.POWER_SAVE_MODE_CHANGED" />
+                <action android:name="android.intent.action.BATTERY_LOW" />
+                <action android:name="android.intent.action.BATTERY_OKAY" />
+            </intent-filter>
+        </receiver>
+
         <meta-data
             android:name="xperiaplayoptimized_content"
             android:resource="@drawable/ic_launcher" />

android/src/org/ppsspp/ppsspp/NativeActivity.java

@@ -28,6 +28,7 @@ import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Environment;
+import android.os.PowerManager;
 import android.os.Vibrator;
 import android.text.InputType;
 import android.util.DisplayMetrics;
@@ -124,6 +125,16 @@ public class NativeActivity extends Activity implements SurfaceHolder.Callback {
 		}
 	}
 
+	@TargetApi(21)
+	private void sendPowerSaving() {
+		final PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
+		if (pm.isPowerSaveMode()) {
+			NativeApp.sendMessage("core_powerSaving", "true");
+		} else {
+			NativeApp.sendMessage("core_powerSaving", "false");
+		}
+	}
+
 	String getApplicationLibraryDir(ApplicationInfo application) {
 	    String libdir = null;
 	    try {
@@ -272,6 +283,9 @@ public class NativeActivity extends Activity implements SurfaceHolder.Callback {
 		javaGL = "true".equalsIgnoreCase(NativeApp.queryConfig("androidJavaGL"));
 
 		sendInitialGrants();
+		if (Build.VERSION.SDK_INT >= 21) {
+			sendPowerSaving();
+		}
 
 		// OK, config should be initialized, we can query for screen rotation.
 		if (Build.VERSION.SDK_INT >= 9) {

android/src/org/ppsspp/ppsspp/PowerSaveModeReceiver.java

@@ -0,0 +1,41 @@
+package org.ppsspp.ppsspp;
+
+import android.annotation.TargetApi;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Build;
+import android.os.PowerManager;
+
+public class PowerSaveModeReceiver extends BroadcastReceiver {
+	private boolean isPowerSaving = false;
+	private boolean isBatteryLow = false;
+
+	@Override
+	public void onReceive(final Context context, final Intent intent) {
+		if (Build.VERSION.SDK_INT >= 21) {
+			isPowerSaving = getPowerSaving(context);
+		} else {
+			isPowerSaving = false;
+		}
+
+		final String action = intent.getAction();
+		if (action.equals(Intent.ACTION_BATTERY_LOW)) {
+			isBatteryLow = true;
+		} else if (action.equals(Intent.ACTION_BATTERY_OKAY)) {
+			isBatteryLow = false;
+		}
+
+		if (isBatteryLow || isPowerSaving) {
+			NativeApp.sendMessage("core_powerSaving", "true");
+		} else {
+			NativeApp.sendMessage("core_powerSaving", "false");
+		}
+	}
+
+	@TargetApi(21)
+	private boolean getPowerSaving(final Context context) {
+		final PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
+		return pm.isPowerSaveMode();
+	}
+}