Added a new option : -n/--no-window

This option allows scrcpy to be run headless : we can now use
scrcpy only for screen recording as an example

app/src/main.c

@@ -13,6 +13,7 @@ struct args {
     const char *crop;
     const char *record_filename;
     SDL_bool fullscreen;
+    SDL_bool no_window;
     SDL_bool help;
     SDL_bool version;
     SDL_bool show_touches;
@@ -50,6 +51,11 @@ static void usage(const char *arg0) {
         "        is preserved.\n"
         "        Default is %d%s.\n"
         "\n"
+        "    -n, --no-window\n"
+        "        Do not show window. This is useful, as an example\n"
+        "        combined with -r/--record option to record screen without displaying\n"
+        "        video feedback\n"
+        "\n"
         "    -p, --port port\n"
         "        Set the TCP port the client listens on.\n"
         "        Default is %d.\n"
@@ -209,6 +215,7 @@ static SDL_bool parse_args(struct args *args, int argc, char *argv[]) {
         {"bit-rate",     required_argument, NULL, 'b'},
         {"crop",         required_argument, NULL, 'c'},
         {"fullscreen",   no_argument,       NULL, 'f'},
+        {"no-window",   no_argument,       NULL, 'n'},
         {"help",         no_argument,       NULL, 'h'},
         {"max-size",     required_argument, NULL, 'm'},
         {"port",         required_argument, NULL, 'p'},
@@ -219,7 +226,7 @@ static SDL_bool parse_args(struct args *args, int argc, char *argv[]) {
         {NULL,           0,                 NULL, 0  },
     };
     int c;
-    while ((c = getopt_long(argc, argv, "b:c:fhm:p:r:s:tv", long_options, NULL)) != -1) {
+    while ((c = getopt_long(argc, argv, "b:c:fnhm:p:r:s:tv", long_options, NULL)) != -1) {
         switch (c) {
             case 'b':
                 if (!parse_bit_rate(optarg, &args->bit_rate)) {
@@ -232,6 +239,9 @@ static SDL_bool parse_args(struct args *args, int argc, char *argv[]) {
             case 'f':
                 args->fullscreen = SDL_TRUE;
                 break;
+            case 'n':
+                args->no_window = SDL_TRUE;
+                break;
             case 'h':
                 args->help = SDL_TRUE;
                 break;
@@ -324,6 +334,7 @@ int main(int argc, char *argv[]) {
         .bit_rate = args.bit_rate,
         .show_touches = args.show_touches,
         .fullscreen = args.fullscreen,
+        .no_window = args.no_window
     };
     int res = scrcpy(&options) ? 0 : 1;
 

app/src/scrcpy.c

@@ -33,6 +33,8 @@ static struct controller controller;
 static struct file_handler file_handler;
 static struct recorder recorder;
 
+SDL_bool no_window;
+
 static struct input_manager input_manager = {
     .controller = &controller,
     .frames = &frames,
@@ -80,7 +82,9 @@ static SDL_bool event_loop(void) {
                 if (!screen.has_frame) {
                     screen.has_frame = SDL_TRUE;
                     // this is the very first frame, show the window
-                    screen_show_window(&screen);
+                    if (!no_window) {
+                        screen_show_window(&screen);
+                    }
                 }
                 if (!screen_update_frame(&screen, &frames)) {
                     return SDL_FALSE;
@@ -237,6 +241,8 @@ SDL_bool scrcpy(const struct scrcpy_options *options) {
         screen_switch_fullscreen(&screen);
     }
 
+    no_window = options->no_window;
+
     ret = event_loop();
     LOGD("quit...");
 

app/src/scrcpy.h

@@ -12,6 +12,7 @@ struct scrcpy_options {
     Uint32 bit_rate;
     SDL_bool show_touches;
     SDL_bool fullscreen;
+    SDL_bool no_window;
 };
 
 SDL_bool scrcpy(const struct scrcpy_options *options);