add display id param

app/src/cli.c

@@ -354,6 +354,18 @@ parse_port_range(const char *s, struct port_range *port_range) {
     return true;
 }
 
+static bool
+parse_display_id(const char *s, uint16_t *display_id) {
+    long value;
+    bool ok = parse_integer_arg(s, &value, false, 0, 0xFFFF, "display id");
+    if (!ok) {
+        return false;
+    }
+
+    *display_id = (uint16_t) value;
+    return true;
+}
+
 static bool
 parse_record_format(const char *optarg, enum recorder_format *format) {
     if (!strcmp(optarg, "mp4")) {
@@ -439,7 +451,7 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
     optind = 0; // reset to start from the first argument in tests
 
     int c;
-    while ((c = getopt_long(argc, argv, "b:c:fF:hm:nNp:r:s:StTv", long_options,
+    while ((c = getopt_long(argc, argv, "b:c:fF:hm:nNpd:r:s:StTv", long_options,
                             NULL)) != -1) {
         switch (c) {
             case 'b':
@@ -493,6 +505,11 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
                     return false;
                 }
                 break;
+            case 'd':
+                if (!parse_display_id(optarg, &opts->display_id)) {
+                    return false;
+                }
+                break;
             case 'r':
                 opts->record_filename = optarg;
                 break;

app/src/scrcpy.c

@@ -286,6 +286,7 @@ scrcpy(const struct scrcpy_options *options) {
         .max_fps = options->max_fps,
         .lock_video_orientation = options->lock_video_orientation,
         .control = options->control,
+        .display_id = options->display_id,
     };
     if (!server_start(&server, options->serial, &params)) {
         return false;

app/src/scrcpy.h

@@ -25,6 +25,7 @@ struct scrcpy_options {
     int16_t window_y;
     uint16_t window_width;
     uint16_t window_height;
+    uint16_t display_id;
     bool show_touches;
     bool fullscreen;
     bool always_on_top;
@@ -55,6 +56,7 @@ struct scrcpy_options {
     .window_y = -1, \
     .window_width = 0, \
     .window_height = 0, \
+    .display_id = 0, \
     .show_touches = false, \
     .fullscreen = false, \
     .always_on_top = false, \

app/src/server.c

@@ -234,10 +234,12 @@ execute_server(struct server *server, const struct server_params *params) {
     char bit_rate_string[11];
     char max_fps_string[6];
     char lock_video_orientation_string[3];
+    char display_id_string[6];
     sprintf(max_size_string, "%"PRIu16, params->max_size);
     sprintf(bit_rate_string, "%"PRIu32, params->bit_rate);
     sprintf(max_fps_string, "%"PRIu16, params->max_fps);
     sprintf(lock_video_orientation_string, "%"PRIi8, params->lock_video_orientation);
+    sprintf(display_id_string, "%"PRIu16, params->display_id);
     const char *const cmd[] = {
         "shell",
         "CLASSPATH=" DEVICE_SERVER_PATH,
@@ -264,6 +266,7 @@ execute_server(struct server *server, const struct server_params *params) {
         params->crop ? params->crop : "-",
         "true", // always send frame meta (packet boundaries + timestamp)
         params->control ? "true" : "false",
+        display_id_string,
     };
 #ifdef SERVER_DEBUGGER
     LOGI("Server debugger waiting for a client on device port "

app/src/server.h

@@ -44,6 +44,7 @@ struct server_params {
     uint16_t max_fps;
     int8_t lock_video_orientation;
     bool control;
+    uint16_t display_id;
 };
 
 // init default values

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

@@ -3,10 +3,12 @@ package com.genymobile.scrcpy;
 public final class DisplayInfo {
     private final Size size;
     private final int rotation;
+    private final int layerStack;
 
-    public DisplayInfo(Size size, int rotation) {
+    public DisplayInfo(Size size, int rotation, int layerStack) {
         this.size = size;
         this.rotation = rotation;
+        this.layerStack = layerStack;
     }
 
     public Size getSize() {
@@ -16,5 +18,9 @@ public final class DisplayInfo {
     public int getRotation() {
         return rotation;
     }
+
+    public int getLayerStack() {
+        return layerStack;
+    }
 }
 

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

@@ -11,6 +11,7 @@ public class Options {
     private Rect crop;
     private boolean sendFrameMeta; // send PTS so that the client may record properly
     private boolean control;
+    private int displayId;
 
     public int getMaxSize() {
         return maxSize;
@@ -75,4 +76,12 @@ public class Options {
     public void setControl(boolean control) {
         this.control = control;
     }
+
+    public int getDisplayId() {
+        return displayId;
+    }
+
+    public void setDisplayId(int displayId) {
+        this.displayId = displayId;
+    }
 }

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

@@ -178,12 +178,12 @@ public class ScreenEncoder implements Device.RotationListener {
         format.setInteger(MediaFormat.KEY_HEIGHT, height);
     }
 
-    private static void setDisplaySurface(IBinder display, Surface surface, int orientation, Rect deviceRect, Rect displayRect) {
+    private static void setDisplaySurface(IBinder display, Surface surface, int orientation, Rect deviceRect, Rect displayRect, int layerStack) {
         SurfaceControl.openTransaction();
         try {
             SurfaceControl.setDisplaySurface(display, surface);
             SurfaceControl.setDisplayProjection(display, orientation, deviceRect, displayRect);
-            SurfaceControl.setDisplayLayerStack(display, 0);
+            SurfaceControl.setDisplayLayerStack(display, layerStack);
         } finally {
             SurfaceControl.closeTransaction();
         }

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

@@ -14,6 +14,7 @@ public final class ScreenInfo {
      * However, it does not include the locked video orientation.
      */
     private final Size unlockedVideoSize;
+    private final int layerStack;
 
     /**
      * Device rotation, related to the natural device orientation (0, 1, 2 or 3)
@@ -30,6 +31,7 @@ public final class ScreenInfo {
         this.unlockedVideoSize = unlockedVideoSize;
         this.deviceRotation = deviceRotation;
         this.lockedVideoOrientation = lockedVideoOrientation;
+        this.layerStack = layerStack;
     }
 
     public Rect getContentRect() {

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

@@ -111,6 +111,9 @@ public final class Server {
         boolean control = Boolean.parseBoolean(args[8]);
         options.setControl(control);
 
+        int displayId = Integer.parseInt(args[8]);
+        options.setDisplayId(displayId);
+
         return options;
     }
 

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

@@ -12,15 +12,16 @@ public final class DisplayManager {
         this.manager = manager;
     }
 
-    public DisplayInfo getDisplayInfo() {
+    public DisplayInfo getDisplayInfo(int displayId) {
         try {
-            Object displayInfo = manager.getClass().getMethod("getDisplayInfo", int.class).invoke(manager, 0);
+            Object displayInfo = manager.getClass().getMethod("getDisplayInfo", int.class).invoke(manager, displayId);
             Class<?> cls = displayInfo.getClass();
             // width and height already take the rotation into account
             int width = cls.getDeclaredField("logicalWidth").getInt(displayInfo);
             int height = cls.getDeclaredField("logicalHeight").getInt(displayInfo);
             int rotation = cls.getDeclaredField("rotation").getInt(displayInfo);
-            return new DisplayInfo(new Size(width, height), rotation);
+            int layerStack = cls.getDeclaredField("layerStack").getInt(displayInfo);
+            return new DisplayInfo(new Size(width, height), rotation, layerStack);
         } catch (Exception e) {
             throw new AssertionError(e);
         }