Add --no-key-repeat cli option

Add an option to avoid forwarding repeated key events.

PR #1623 <https://github.com/Genymobile/scrcpy/pull/1623>
Refs #1013 <https://github.com/Genymobile/scrcpy/issues/1013>

Signed-off-by: Romain Vimont <rom@rom1v.com>

README.md

@@ -558,6 +558,18 @@ scrcpy --prefer-text
 [prefertext]: https://github.com/Genymobile/scrcpy/issues/650#issuecomment-512945343
 
 
+#### Key repeat
+
+By default, holding a key down generates repeated key events. This can cause
+performance problems in some games, where these events are useless anyway.
+
+To avoid forwarding repeated key events:
+
+```bash
+scrcpy --no-key-repeat
+```
+
+
 ### File drop
 
 #### Install APK

app/scrcpy.1

@@ -96,6 +96,10 @@ Do not display device (only when screen recording is enabled).
 .B \-\-no\-mipmaps
 If the renderer is OpenGL 3.0+ or OpenGL ES 2.0+, then mipmaps are automatically generated to improve downscaling quality. This option disables the generation of mipmaps.
 
+.TP
+.B \-\-no\-key\-repeat
+Do not forward repeated key events when a key is held down.
+
 .TP
 .BI "\-p, \-\-port " port[:port]
 Set the TCP port (range) used by the client to listen.

app/src/cli.c

@@ -92,6 +92,9 @@ scrcpy_print_usage(const char *arg0) {
         "        mipmaps are automatically generated to improve downscaling\n"
         "        quality. This option disables the generation of mipmaps.\n"
         "\n"
+        "    --no-key-repeat\n"
+        "        Do not forward repeated key events when a key is held down.\n"
+        "\n"
         "    -p, --port port[:port]\n"
         "        Set the TCP port (range) used by the client to listen.\n"
         "        Default is %d:%d.\n"
@@ -642,6 +645,7 @@ guess_record_format(const char *filename) {
 #define OPT_FORCE_ADB_FORWARD      1019
 #define OPT_DISABLE_SCREENSAVER    1020
 #define OPT_SHORTCUT_MOD           1021
+#define OPT_NO_KEY_REPEAT          1022
 
 bool
 scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
@@ -664,6 +668,7 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
         {"no-control",             no_argument,       NULL, 'n'},
         {"no-display",             no_argument,       NULL, 'N'},
         {"no-mipmaps",             no_argument,       NULL, OPT_NO_MIPMAPS},
+        {"no-key-repeat",          no_argument,       NULL, OPT_NO_KEY_REPEAT},
         {"port",                   required_argument, NULL, 'p'},
         {"prefer-text",            no_argument,       NULL, OPT_PREFER_TEXT},
         {"push-target",            required_argument, NULL, OPT_PUSH_TARGET},
@@ -829,6 +834,9 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
             case OPT_NO_MIPMAPS:
                 opts->mipmaps = false;
                 break;
+            case OPT_NO_KEY_REPEAT:
+                opts->forward_key_repeat = false;
+                break;
             case OPT_CODEC_OPTIONS:
                 opts->codec_options = optarg;
                 break;

app/src/input_manager.c

@@ -58,6 +58,7 @@ input_manager_init(struct input_manager *im,
                    const struct scrcpy_options *options)
 {
     im->control = options->control;
+    im->forward_key_repeat = options->forward_key_repeat;
     im->prefer_text = options->prefer_text;
 
     const struct sc_shortcut_mods *shortcut_mods = &options->shortcut_mods;
@@ -461,6 +462,9 @@ input_manager_process_key(struct input_manager *im,
     }
 
     if (event->repeat) {
+        if (!im->forward_key_repeat) {
+            return;
+        }
         ++im->repeat;
     } else {
         im->repeat = 0;

app/src/input_manager.h

@@ -23,6 +23,7 @@ struct input_manager {
     unsigned repeat;
 
     bool control;
+    bool forward_key_repeat;
     bool prefer_text;
 
     struct {

app/src/scrcpy.h

@@ -78,6 +78,7 @@ struct scrcpy_options {
     bool stay_awake;
     bool force_adb_forward;
     bool disable_screensaver;
+    bool forward_key_repeat;
 };
 
 #define SCRCPY_OPTIONS_DEFAULT { \
@@ -121,6 +122,7 @@ struct scrcpy_options {
     .stay_awake = false, \
     .force_adb_forward = false, \
     .disable_screensaver = false, \
+    .forward_key_repeat = true, \
 }
 
 bool