Add shortcuts to switch the camera torch

MOD+l turns on the camera torch, MOD+Shift+l turns it off.

TODO ref 6243

Co-authored-by: Tommie <teh420@gmail.com>

app/scrcpy.1

@@ -819,6 +819,14 @@ Install APK from computer
 .B Drag & drop non-APK file
 Push file to device (see \fB\-\-push\-target\fR)
 
+.TP
+.B MOD+l
+Turn on the camera torch (camera mode only)
+
+.TP
+.B MOD+Shift+l
+Turn off the camera torch (camera mode only)
+
 
 .SH Environment variables
 

app/src/cli.c

@@ -1213,6 +1213,14 @@ static const struct sc_shortcut shortcuts[] = {
         .shortcuts = { "Drag & drop non-APK file" },
         .text = "Push file to device (see --push-target)",
     },
+    {
+        .shortcuts = { "MOD+l" },
+        .text = "Turn on the camera torch (camera mode only)",
+    },
+    {
+        .shortcuts = { "MOD+Shift+l" },
+        .text = "Turn off the camera torch (camera mode only)",
+    },
 };
 
 static const struct sc_envvar envvars[] = {

app/src/control_msg.c

@@ -182,6 +182,9 @@ sc_control_msg_serialize(const struct sc_control_msg *msg, uint8_t *buf) {
             size_t len = write_string_tiny(&buf[1], msg->start_app.name, 255);
             return 1 + len;
         }
+        case SC_CONTROL_MSG_TYPE_CAMERA_SET_TORCH:
+            buf[1] = msg->camera_set_torch.on ? 1 : 0;
+            return 2;
         case SC_CONTROL_MSG_TYPE_EXPAND_NOTIFICATION_PANEL:
         case SC_CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL:
         case SC_CONTROL_MSG_TYPE_COLLAPSE_PANELS:

app/src/control_msg.h

@@ -43,6 +43,7 @@ enum sc_control_msg_type {
     SC_CONTROL_MSG_TYPE_OPEN_HARD_KEYBOARD_SETTINGS,
     SC_CONTROL_MSG_TYPE_START_APP,
     SC_CONTROL_MSG_TYPE_RESET_VIDEO,
+    SC_CONTROL_MSG_TYPE_CAMERA_SET_TORCH,
 };
 
 enum sc_copy_key {
@@ -111,6 +112,9 @@ struct sc_control_msg {
         struct {
             char *name;
         } start_app;
+        struct {
+            bool on;
+        } camera_set_torch;
     };
 };
 

app/src/input_manager.c

@@ -302,6 +302,19 @@ reset_video(struct sc_input_manager *im) {
     }
 }
 
+static void
+camera_set_torch(struct sc_input_manager *im, bool on) {
+    assert(im->controller && im->camera);
+
+    struct sc_control_msg msg;
+    msg.type = SC_CONTROL_MSG_TYPE_CAMERA_SET_TORCH;
+    msg.camera_set_torch.on = on;
+
+    if (!sc_controller_push_msg(im->controller, &msg)) {
+        LOGW("Could not request setting camera torch");
+    }
+}
+
 static void
 apply_orientation_transform(struct sc_input_manager *im,
                             enum sc_orientation transform) {
@@ -572,6 +585,16 @@ sc_input_manager_process_key(struct sc_input_manager *im,
             }
         }
 
+        if (control && im->camera) {
+            switch (sdl_keycode) {
+                case SDLK_L:
+                    if (!repeat && down) {
+                        camera_set_torch(im, !shift);
+                    }
+                    return;
+            }
+        }
+
         return;
     }
 

app/tests/test_control_msg_serialize.c

@@ -446,6 +446,25 @@ static void test_serialize_reset_video(void) {
     assert(!memcmp(buf, expected, sizeof(expected)));
 }
 
+static void test_serialize_camera_set_torch(void) {
+    struct sc_control_msg msg = {
+        .type = SC_CONTROL_MSG_TYPE_CAMERA_SET_TORCH,
+        .camera_set_torch = {
+            .on = true,
+        },
+    };
+
+    uint8_t buf[SC_CONTROL_MSG_MAX_SIZE];
+    size_t size = sc_control_msg_serialize(&msg, buf);
+    assert(size == 2);
+
+    const uint8_t expected[] = {
+        SC_CONTROL_MSG_TYPE_CAMERA_SET_TORCH,
+        0x01, // true
+    };
+    assert(!memcmp(buf, expected, sizeof(expected)));
+}
+
 int main(int argc, char *argv[]) {
     (void) argc;
     (void) argv;
@@ -470,5 +489,6 @@ int main(int argc, char *argv[]) {
     test_serialize_open_hard_keyboard();
     test_serialize_start_app();
     test_serialize_reset_video();
+    test_serialize_camera_set_torch();
     return 0;
 }