virtual display

app/src/cli.c

@@ -80,6 +80,8 @@ enum {
     OPT_KILL_ADB_ON_CLOSE,
     OPT_TIME_LIMIT,
     OPT_ROOT,
+    OPT_SU_QUIRK,
+    OPT_VIRTUAL_DISPLAY,
 };
 
 struct sc_option {
@@ -541,6 +543,19 @@ static const struct sc_option options[] = {
         .longopt = "root",
         .text = "Launch the server as root (disabled by default).",
     },
+    {
+        .longopt_id = OPT_SU_QUIRK,
+        .longopt = "su-quirk",
+        .text = "Enable workaround for quirky su (disabled by default).",
+    },
+    {
+        .longopt_id = OPT_VIRTUAL_DISPLAY,
+        .longopt = "virtual-display",
+        .argdesc = "properties",
+        .text = "Start a new virtual display for your applications to "
+                "launch into. Requires Android version >= 10."
+                "Display size and DPI may be specified. e.g. 1920x1080dpi300"
+    },
     {
         .shortopt = 's',
         .longopt = "serial",
@@ -1986,6 +2001,12 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_ROOT:
                 opts->root = true;
                 break;
+            case OPT_SU_QUIRK:
+                opts->su_quirk = true;
+                break;
+            case OPT_VIRTUAL_DISPLAY:
+                opts->virtual_display_params = optarg;
+                break;
             default:
                 // getopt prints the error message on stderr
                 return false;

app/src/options.c

@@ -83,4 +83,6 @@ const struct scrcpy_options scrcpy_options_default = {
     .list_displays = false,
     .kill_adb_on_close = false,
     .root = false,
+    .su_quirk = false,
+    .virtual_display_params = NULL,
 };

app/src/options.h

@@ -183,6 +183,8 @@ struct scrcpy_options {
     bool list_displays;
     bool kill_adb_on_close;
     bool root;
+    bool su_quirk;
+    const char *virtual_display_params;
 };
 
 extern const struct scrcpy_options scrcpy_options_default;

app/src/scrcpy.c

@@ -381,6 +381,8 @@ scrcpy(struct scrcpy_options *options) {
         .list_displays = options->list_displays,
         .kill_adb_on_close = options->kill_adb_on_close,
         .root = options->root,
+        .su_quirk = options->su_quirk,
+        .virtual_display_params = options->virtual_display_params,
     };
 
     static const struct sc_server_callbacks cbs = {

app/src/server.c

@@ -198,7 +198,8 @@ execute_server(struct sc_server *server,
     if (params->root) {
         cmd[count++] = "su";
         cmd[count++] = "1000"; // AID_SYSTEM, AID_GRAPHICS is also supported for FLAG_SECURE but lacks other perms
-        cmd[count++] = "-c";
+        if (!params->su_quirk) cmd[count++] = "-c";
+        cmd[count++] = "env";
     }
 
     cmd[count++] = "CLASSPATH=" SC_DEVICE_SERVER_PATH;
@@ -323,6 +324,10 @@ execute_server(struct sc_server *server,
     if (params->list_displays) {
         ADD_PARAM("list_displays=true");
     }
+    if (params->virtual_display_params) {
+        ADD_PARAM("virtual_display=%s", params->virtual_display_params);
+    }
+
 
 #undef ADD_PARAM
 

app/src/server.h

@@ -60,6 +60,8 @@ struct sc_server_params {
     bool list_displays;
     bool kill_adb_on_close;
     bool root;
+    bool su_quirk;
+    const char *virtual_display_params;
 };
 
 struct sc_server {

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

@@ -68,7 +68,10 @@ public final class Device {
     private final boolean supportsInputEvents;
 
     public Device(Options options) throws ConfigurationException {
-        displayId = options.getDisplayId();
+        String virtualDisplayParams = options.getVirtualDisplayParams();
+        displayId = virtualDisplayParams == null
+                ? options.getDisplayId()
+                : ServiceManager.getDisplayManager().createVirtualDisplay(virtualDisplayParams).getDisplay().getDisplayId();
         DisplayInfo displayInfo = ServiceManager.getDisplayManager().getDisplayInfo(displayId);
         if (displayInfo == null) {
             Ln.e("Display " + displayId + " not found\n" + LogUtils.buildDisplayListMessage());

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

@@ -44,6 +44,7 @@ public class Options {
     private boolean sendFrameMeta = true; // send PTS so that the client may record properly
     private boolean sendDummyByte = true; // write a byte on start to detect connection issues
     private boolean sendCodecMeta = true; // write the codec metadata before the stream
+    private String virtualDisplayParams = null;
 
     public Ln.Level getLogLevel() {
         return logLevel;
@@ -176,6 +177,9 @@ public class Options {
     public boolean getSendCodecMeta() {
         return sendCodecMeta;
     }
+    public String getVirtualDisplayParams() {
+        return virtualDisplayParams;
+    }
 
     @SuppressWarnings("MethodLength")
     public static Options parse(String... args) {
@@ -327,6 +331,9 @@ public class Options {
                         options.sendCodecMeta = false;
                     }
                     break;
+                case "virtual_display":
+                    options.virtualDisplayParams = value;
+                    break;
                 default:
                     Ln.w("Unknown server option: " + key);
                     break;

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

@@ -2,10 +2,15 @@ package com.genymobile.scrcpy.wrappers;
 
 import com.genymobile.scrcpy.Command;
 import com.genymobile.scrcpy.DisplayInfo;
+import com.genymobile.scrcpy.FakeContext;
 import com.genymobile.scrcpy.Ln;
 import com.genymobile.scrcpy.Size;
 
+import android.graphics.SurfaceTexture;
+import android.hardware.display.VirtualDisplay;
+import android.os.Build;
 import android.view.Display;
+import android.view.Surface;
 
 import java.lang.reflect.Field;
 import java.util.regex.Matcher;
@@ -18,6 +23,35 @@ public final class DisplayManager {
         this.manager = manager;
     }
 
+    public VirtualDisplay createVirtualDisplay(String displayParams) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) throw new RuntimeException("requires android 10+");
+        final int VIRTUAL_DISPLAY_FLAG_TRUSTED = 1 << 10;
+        final int VIRTUAL_DISPLAY_FLAG_ALWAYS_UNLOCKED = 1 << 12;
+        try {
+            if (displayParams == null || displayParams.isEmpty()) displayParams = "1920x1080dpi300";
+            String resolution = displayParams.toLowerCase().split("dpi")[0];
+            int width = Integer.parseInt(resolution.split("x")[0]);
+            int height = Integer.parseInt(resolution.split("x")[1]);
+            int dpi = Integer.parseInt(displayParams.toLowerCase().split("dpi")[1]);
+            android.hardware.display.DisplayManager displayManager = (android.hardware.display.DisplayManager)Class.forName("android.hardware.display.DisplayManager").getConstructor(Class.forName("android.content.Context")).newInstance(FakeContext.get());
+            SurfaceTexture surfaceTexture = new SurfaceTexture(false);
+            Surface surface = new Surface(surfaceTexture);
+            VirtualDisplay[] display = new VirtualDisplay[1];
+            display[0] = displayManager.createVirtualDisplay("scrcpy", width, height, dpi, surface,
+                android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC
+                        | android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR
+                        | android.hardware.display.DisplayManager.VIRTUAL_DISPLAY_FLAG_SECURE
+                        | VIRTUAL_DISPLAY_FLAG_TRUSTED
+                        | VIRTUAL_DISPLAY_FLAG_ALWAYS_UNLOCKED);
+            // start launcher
+            // TODO: replace shell commands with proper android framework api call
+            Command.exec("am", "start", "--user", "0", "--display", Integer.toString(display[0].getDisplay().getDisplayId()), "-a", "android.intent.action.MAIN", "-c", "android.intent.category.HOME", "-c", "android.intent.category.DEFAULT");
+            return display[0];
+        } catch (Exception e) {
+            throw new AssertionError(e);
+        }
+    }
+
     // public to call it from unit tests
     public static DisplayInfo parseDisplayInfo(String dumpsysDisplayOutput, int displayId) {
         Pattern regex = Pattern.compile(