add check for presentaion display and prompt about available display id

app/src/cli.c

@@ -60,6 +60,9 @@ scrcpy_print_usage(const char *arg0) {
         "    -n, --no-control\n"
         "        Disable device control (mirror the device in read-only).\n"
         "\n"
+        "    -d, --display\n"
+        "        Specify the display id to mirror, default 0\n"
+        "\n"
         "    -N, --no-display\n"
         "        Do not display device (only when screen recording is\n"
         "        enabled).\n"

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -2,7 +2,6 @@ package com.genymobile.scrcpy;
 
 import com.genymobile.scrcpy.wrappers.InputManager;
 
-import android.os.Build;
 import android.os.SystemClock;
 import android.view.InputDevice;
 import android.view.InputEvent;
@@ -11,8 +10,6 @@ import android.view.KeyEvent;
 import android.view.MotionEvent;
 
 import java.io.IOException;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 
 public class Controller {
 
@@ -222,10 +219,10 @@ public class Controller {
     }
 
     private boolean injectEvent(InputEvent event) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
+        if (device.isSupportInputEvents())
-            InputManager.setDisplayId(event, device.getDisplayId());
+            return device.injectInputEvent(event, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
-        }
+        else
-        return device.injectInputEvent(event, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
+            return false;
     }
 
     private boolean pressBackOrTurnScreenOn() {

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -1,5 +1,6 @@
 package com.genymobile.scrcpy;
 
+import com.genymobile.scrcpy.wrappers.InputManager;
 import com.genymobile.scrcpy.wrappers.ServiceManager;
 import com.genymobile.scrcpy.wrappers.SurfaceControl;
 import com.genymobile.scrcpy.wrappers.WindowManager;
@@ -22,7 +23,7 @@ public final class Device {
 
     private final ServiceManager serviceManager = new ServiceManager();
 
-    private final int displayId;
+    private final DisplayInfo displayInfo;
     private ScreenInfo screenInfo;
     private RotationListener rotationListener;
 
@@ -42,6 +43,12 @@ public final class Device {
                 }
             }
         });
+        if (!displayInfo.isSupportProtectedBuffers()) {
+            Ln.w("Display doesn't have FLAG_SUPPORTS_PROTECTED_BUFFERS flag, mirroring can be restricted");
+        }
+        if (!isSupportInputEvents()) {
+            Ln.w("Input events for display with flag FLAG_PRESENTATION, can be supported since API 29");
+        }
     }
 
     public synchronized ScreenInfo getScreenInfo() {
@@ -77,11 +84,12 @@ public final class Device {
         return Build.MODEL;
     }
 
-    public int getDisplayId() {
-        return displayId;
-    }
-
     public boolean injectInputEvent(InputEvent inputEvent, int mode) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
+            InputManager.setDisplayId(inputEvent, displayInfo.getDisplayId());
+        }
+
+
         return serviceManager.getInputManager().injectInputEvent(inputEvent, mode);
     }
 
@@ -89,6 +97,13 @@ public final class Device {
         return serviceManager.getPowerManager().isScreenOn();
     }
 
+    public boolean isSupportInputEvents(){
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
+            return true;
+        else
+            return !displayInfo.isPresentation();
+    }
+
     public void registerRotationWatcher(IRotationWatcher rotationWatcher) {
         serviceManager.getWindowManager().registerRotationWatcher(rotationWatcher);
     }

server/src/main/java/com/genymobile/scrcpy/DisplayInfo.java

@@ -1,14 +1,28 @@
 package com.genymobile.scrcpy;
 
 public final class DisplayInfo {
+    private final int displayId;
     private final Size size;
     private final int rotation;
     private final int layerStack;
+    private final int flags;
 
-    public DisplayInfo(Size size, int rotation, int layerStack) {
+    public static final int DEFAULT_DISPLAY = 0x00000000;
+
+    public static final int FLAG_PRESENTATION = 0x00000008;
+
+    public static final int FLAG_SUPPORTS_PROTECTED_BUFFERS = 0x00000001;
+
+    public DisplayInfo(int displayId, Size size, int rotation, int layerStack, int flags) {
+        this.displayId = displayId;
         this.size = size;
         this.rotation = rotation;
         this.layerStack = layerStack;
+        this.flags = flags;
+    }
+
+    public int getDisplayId() {
+        return displayId;
     }
 
     public Size getSize() {
@@ -22,5 +36,13 @@ public final class DisplayInfo {
     public int getLayerStack() {
         return layerStack;
     }
+
+    public boolean isPresentation() {
+        return (flags & FLAG_PRESENTATION) == FLAG_PRESENTATION;
+    }
+
+    public boolean isSupportProtectedBuffers() {
+        return (flags & FLAG_SUPPORTS_PROTECTED_BUFFERS) == FLAG_SUPPORTS_PROTECTED_BUFFERS;
+    }
 }
 

server/src/main/java/com/genymobile/scrcpy/wrappers/DisplayManager.java

@@ -1,10 +1,11 @@
 package com.genymobile.scrcpy.wrappers;
 
-import com.genymobile.scrcpy.DisplayInfo;
-import com.genymobile.scrcpy.Size;
-
 import android.os.IInterface;
 
+import com.genymobile.scrcpy.DisplayInfo;
+import com.genymobile.scrcpy.Ln;
+import com.genymobile.scrcpy.Size;
+
 public final class DisplayManager {
     private final IInterface manager;
 
@@ -21,9 +22,33 @@ public final class DisplayManager {
             int height = cls.getDeclaredField("logicalHeight").getInt(displayInfo);
             int rotation = cls.getDeclaredField("rotation").getInt(displayInfo);
             int layerStack = cls.getDeclaredField("layerStack").getInt(displayInfo);
-            return new DisplayInfo(new Size(width, height), rotation, layerStack);
+            int flags = cls.getDeclaredField("flags").getInt(displayInfo);
+            return new DisplayInfo(displayId, new Size(width, height), rotation, layerStack, flags);
+        } catch (Exception e) {
+            if (e instanceof NullPointerException) suggestFix(displayId, getDisplayIds());
+            throw new AssertionError(e);
+        }
+    }
+
+    public int[] getDisplayIds() {
+        try {
+            return (int[]) manager.getClass().getMethod("getDisplayIds").invoke(manager);
         } catch (Exception e) {
             throw new AssertionError(e);
         }
     }
+
+    private void suggestFix(int displayId, int[] displayIds) {
+        if (displayIds == null || displayIds.length == 0)
+            return;
+
+        StringBuilder sb = new StringBuilder();
+        sb.append("Failed to get displayId=[")
+                .append(displayId)
+                .append("]\nTry to user one of these available display ids:\n");
+        for (int id : displayIds) {
+            sb.append("scrcpy --display ").append(id).append("\n");
+        }
+        Ln.e(sb.toString());
+    }
 }