Call Looper.prepareMainLooper() to avoid exception

Some devices internally create a Handler when creating an input Surface,
causing an exception:

> Surface: java.lang.RuntimeException: Can't create handler inside
> thread that has not called Looper.prepare()

As a workaround, call Looper.prepareMainLooper() beforehand.

Fixes:
 - <https://github.com/Genymobile/scrcpy/issues/240>
 - <https://github.com/Genymobile/scrcpy/issues/921>

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

README.md

@@ -143,7 +143,6 @@ This is useful for example to mirror only one eye of the Oculus Go:
 
 ```bash
 scrcpy --crop 1224:1440:0:0   # 1224x1440 at offset (0,0)
-scrcpy -c 1224:1440:0:0       # short version
 ```
 
 If `--max-size` is also specified, resizing is applied after cropping.
@@ -226,7 +225,6 @@ The window of app can always be above others by:
 
 ```bash
 scrcpy --always-on-top
-scrcpy -T  # short version
 ```
 
 

app/meson.build

@@ -109,15 +109,15 @@ conf.set('DEFAULT_MAX_SIZE', '0')  # 0: unlimited
 # overridden by option --bit-rate
 conf.set('DEFAULT_BIT_RATE', '8000000')  # 8Mbps
 
+# enable High DPI support
+conf.set('HIDPI_SUPPORT', get_option('hidpi_support'))
+
 # disable console on Windows
 conf.set('WINDOWS_NOCONSOLE', get_option('windows_noconsole'))
 
 # run a server debugger and wait for a client to be attached
 conf.set('SERVER_DEBUGGER', get_option('server_debugger'))
 
-# enable a workaround for bug #15
-conf.set('HIDPI_WORKAROUND', get_option('hidpi_workaround'))
-
 configure_file(configuration: conf, output: 'config.h')
 
 src_dir = include_directories('src')

app/scrcpy.1

@@ -61,6 +61,13 @@ Set the TCP port the client listens on.
 
 Default is 27183.
 
+.TP
+.B \-\-prefer\-text
+Inject alpha characters and space as text events instead of key events.
+
+This avoids issues when combining multiple keys to enter special characters,
+but breaks the expected behavior of alpha keys in games (typically WASD).
+
 .TP
 .BI "\-\-push\-target " path
 Set the target directory for pushing files to the device by drag & drop. It is passed as\-is to "adb push".

app/src/event_converter.c

@@ -75,7 +75,8 @@ convert_meta_state(SDL_Keymod mod) {
 }
 
 bool
-convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod) {
+convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod,
+                bool prefer_text) {
     switch (from) {
         MAP(SDLK_RETURN,       AKEYCODE_ENTER);
         MAP(SDLK_KP_ENTER,     AKEYCODE_NUMPAD_ENTER);
@@ -92,6 +93,12 @@ convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod) {
         MAP(SDLK_DOWN,         AKEYCODE_DPAD_DOWN);
         MAP(SDLK_UP,           AKEYCODE_DPAD_UP);
     }
+
+    if (prefer_text) {
+        // do not forward alpha and space key events
+        return false;
+    }
+
     if (mod & (KMOD_LALT | KMOD_RALT | KMOD_LGUI | KMOD_RGUI)) {
         return false;
     }

app/src/event_converter.h

@@ -14,7 +14,8 @@ enum android_metastate
 convert_meta_state(SDL_Keymod mod);
 
 bool
-convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod);
+convert_keycode(SDL_Keycode from, enum android_keycode *to, uint16_t mod,
+                bool prefer_text);
 
 enum android_motionevent_buttons
 convert_mouse_buttons(uint32_t state);

app/src/input_manager.c

@@ -214,12 +214,15 @@ clipboard_paste(struct controller *controller) {
 void
 input_manager_process_text_input(struct input_manager *im,
                                  const SDL_TextInputEvent *event) {
-    char c = event->text[0];
+    if (!im->prefer_text) {
-    if (isalpha(c) || c == ' ') {
+        char c = event->text[0];
-        SDL_assert(event->text[1] == '\0');
+        if (isalpha(c) || c == ' ') {
-        // letters and space are handled as raw key event
+            SDL_assert(event->text[1] == '\0');
-        return;
+            // letters and space are handled as raw key event
+            return;
+        }
     }
+
     struct control_msg msg;
     msg.type = CONTROL_MSG_TYPE_INJECT_TEXT;
     msg.inject_text.text = SDL_strdup(event->text);
@@ -234,7 +237,8 @@ input_manager_process_text_input(struct input_manager *im,
 }
 
 static bool
-convert_input_key(const SDL_KeyboardEvent *from, struct control_msg *to) {
+convert_input_key(const SDL_KeyboardEvent *from, struct control_msg *to,
+                  bool prefer_text) {
     to->type = CONTROL_MSG_TYPE_INJECT_KEYCODE;
 
     if (!convert_keycode_action(from->type, &to->inject_keycode.action)) {
@@ -242,7 +246,8 @@ convert_input_key(const SDL_KeyboardEvent *from, struct control_msg *to) {
     }
 
     uint16_t mod = from->keysym.mod;
-    if (!convert_keycode(from->keysym.sym, &to->inject_keycode.keycode, mod)) {
+    if (!convert_keycode(from->keysym.sym, &to->inject_keycode.keycode, mod,
+                         prefer_text)) {
         return false;
     }
 
@@ -393,7 +398,7 @@ input_manager_process_key(struct input_manager *im,
     }
 
     struct control_msg msg;
-    if (convert_input_key(event, &msg)) {
+    if (convert_input_key(event, &msg, im->prefer_text)) {
         if (!controller_push_msg(controller, &msg)) {
             LOGW("Could not request 'inject keycode'");
         }

app/src/input_manager.h

@@ -14,6 +14,7 @@ struct input_manager {
     struct controller *controller;
     struct video_buffer *video_buffer;
     struct screen *screen;
+    bool prefer_text;
 };
 
 void

app/src/main.c

@@ -14,24 +14,9 @@
 #include "recorder.h"
 
 struct args {
-    const char *serial;
+    struct scrcpy_options opts;
-    const char *crop;
-    const char *record_filename;
-    const char *window_title;
-    const char *push_target;
-    enum recorder_format record_format;
-    bool fullscreen;
-    bool no_control;
-    bool no_display;
     bool help;
     bool version;
-    bool show_touches;
-    uint16_t port;
-    uint16_t max_size;
-    uint32_t bit_rate;
-    bool always_on_top;
-    bool turn_screen_off;
-    bool render_expired_frames;
 };
 
 static void usage(const char *arg0) {
@@ -82,6 +67,13 @@ static void usage(const char *arg0) {
         "        Set the TCP port the client listens on.\n"
         "        Default is %d.\n"
         "\n"
+        "    --prefer-text\n"
+        "        Inject alpha characters and space as text events instead of\n"
+        "        key events.\n"
+        "        This avoids issues when combining multiple keys to enter a\n"
+        "        special character, but breaks the expected behavior of alpha\n"
+        "        keys in games (typically WASD).\n"
+        "\n"
         "    --push-target path\n"
         "        Set the target directory for pushing files to the device by\n"
         "        drag & drop. It is passed as-is to \"adb push\".\n"
@@ -312,50 +304,63 @@ guess_record_format(const char *filename) {
 #define OPT_RENDER_EXPIRED_FRAMES 1000
 #define OPT_WINDOW_TITLE          1001
 #define OPT_PUSH_TARGET           1002
+#define OPT_ALWAYS_ON_TOP         1003
+#define OPT_CROP                  1004
+#define OPT_RECORD_FORMAT         1005
+#define OPT_PREFER_TEXT           1006
 
 static bool
 parse_args(struct args *args, int argc, char *argv[]) {
     static const struct option long_options[] = {
-        {"always-on-top",         no_argument,       NULL, 'T'},
+        {"always-on-top",         no_argument,       NULL, OPT_ALWAYS_ON_TOP},
         {"bit-rate",              required_argument, NULL, 'b'},
-        {"crop",                  required_argument, NULL, 'c'},
+        {"crop",                  required_argument, NULL, OPT_CROP},
         {"fullscreen",            no_argument,       NULL, 'f'},
         {"help",                  no_argument,       NULL, 'h'},
         {"max-size",              required_argument, NULL, 'm'},
         {"no-control",            no_argument,       NULL, 'n'},
         {"no-display",            no_argument,       NULL, 'N'},
         {"port",                  required_argument, NULL, 'p'},
-        {"push-target",           required_argument, NULL,
+        {"push-target",           required_argument, NULL, OPT_PUSH_TARGET},
-                                                 OPT_PUSH_TARGET},
         {"record",                required_argument, NULL, 'r'},
-        {"record-format",         required_argument, NULL, 'F'},
+        {"record-format",         required_argument, NULL, OPT_RECORD_FORMAT},
         {"render-expired-frames", no_argument,       NULL,
-                                                 OPT_RENDER_EXPIRED_FRAMES},
+                                                     OPT_RENDER_EXPIRED_FRAMES},
         {"serial",                required_argument, NULL, 's'},
         {"show-touches",          no_argument,       NULL, 't'},
         {"turn-screen-off",       no_argument,       NULL, 'S'},
+        {"prefer-text",           no_argument,       NULL, OPT_PREFER_TEXT},
         {"version",               no_argument,       NULL, 'v'},
         {"window-title",          required_argument, NULL,
-                                                 OPT_WINDOW_TITLE},
+                                                     OPT_WINDOW_TITLE},
         {NULL,                    0,                 NULL, 0  },
     };
+
+    struct scrcpy_options *opts = &args->opts;
+
     int c;
     while ((c = getopt_long(argc, argv, "b:c:fF:hm:nNp:r:s:StTv", long_options,
                             NULL)) != -1) {
         switch (c) {
             case 'b':
-                if (!parse_bit_rate(optarg, &args->bit_rate)) {
+                if (!parse_bit_rate(optarg, &opts->bit_rate)) {
                     return false;
                 }
                 break;
             case 'c':
-                args->crop = optarg;
+                LOGW("Deprecated option -c. Use --crop instead.");
+                // fall through
+            case OPT_CROP:
+                opts->crop = optarg;
                 break;
             case 'f':
-                args->fullscreen = true;
+                opts->fullscreen = true;
                 break;
             case 'F':
-                if (!parse_record_format(optarg, &args->record_format)) {
+                LOGW("Deprecated option -F. Use --record-format instead.");
+                // fall through
+            case OPT_RECORD_FORMAT:
+                if (!parse_record_format(optarg, &opts->record_format)) {
                     return false;
                 }
                 break;
@@ -363,47 +368,53 @@ parse_args(struct args *args, int argc, char *argv[]) {
                 args->help = true;
                 break;
             case 'm':
-                if (!parse_max_size(optarg, &args->max_size)) {
+                if (!parse_max_size(optarg, &opts->max_size)) {
                     return false;
                 }
                 break;
             case 'n':
-                args->no_control = true;
+                opts->control = false;
                 break;
             case 'N':
-                args->no_display = true;
+                opts->display = false;
                 break;
             case 'p':
-                if (!parse_port(optarg, &args->port)) {
+                if (!parse_port(optarg, &opts->port)) {
                     return false;
                 }
                 break;
             case 'r':
-                args->record_filename = optarg;
+                opts->record_filename = optarg;
                 break;
             case 's':
-                args->serial = optarg;
+                opts->serial = optarg;
                 break;
             case 'S':
-                args->turn_screen_off = true;
+                opts->turn_screen_off = true;
                 break;
             case 't':
-                args->show_touches = true;
+                opts->show_touches = true;
                 break;
             case 'T':
-                args->always_on_top = true;
+                LOGW("Deprecated option -T. Use --always-on-top instead.");
+                // fall through
+            case OPT_ALWAYS_ON_TOP:
+                opts->always_on_top = true;
                 break;
             case 'v':
                 args->version = true;
                 break;
             case OPT_RENDER_EXPIRED_FRAMES:
-                args->render_expired_frames = true;
+                opts->render_expired_frames = true;
                 break;
             case OPT_WINDOW_TITLE:
-                args->window_title = optarg;
+                opts->window_title = optarg;
                 break;
             case OPT_PUSH_TARGET:
-                args->push_target = optarg;
+                opts->push_target = optarg;
+                break;
+            case OPT_PREFER_TEXT:
+                opts->prefer_text = true;
                 break;
             default:
                 // getopt prints the error message on stderr
@@ -411,12 +422,12 @@ parse_args(struct args *args, int argc, char *argv[]) {
         }
     }
 
-    if (args->no_display && !args->record_filename) {
+    if (!opts->display && !opts->record_filename) {
         LOGE("-N/--no-display requires screen recording (-r/--record)");
         return false;
     }
 
-    if (args->no_display && args->fullscreen) {
+    if (!opts->display && opts->fullscreen) {
         LOGE("-f/--fullscreen-window is incompatible with -N/--no-display");
         return false;
     }
@@ -427,21 +438,21 @@ parse_args(struct args *args, int argc, char *argv[]) {
         return false;
     }
 
-    if (args->record_format && !args->record_filename) {
+    if (opts->record_format && !opts->record_filename) {
         LOGE("Record format specified without recording");
         return false;
     }
 
-    if (args->record_filename && !args->record_format) {
+    if (opts->record_filename && !opts->record_format) {
-        args->record_format = guess_record_format(args->record_filename);
+        opts->record_format = guess_record_format(opts->record_filename);
-        if (!args->record_format) {
+        if (!opts->record_format) {
             LOGE("No format specified for \"%s\" (try with -F mkv)",
-                 args->record_filename);
+                 opts->record_filename);
             return false;
         }
     }
 
-    if (args->no_control && args->turn_screen_off) {
+    if (!opts->control && opts->turn_screen_off) {
         LOGE("Could not request to turn screen off if control is disabled");
         return false;
     }
@@ -458,24 +469,11 @@ main(int argc, char *argv[]) {
     setbuf(stderr, NULL);
 #endif
     struct args args = {
-        .serial = NULL,
+        .opts = SCRCPY_OPTIONS_DEFAULT,
-        .crop = NULL,
-        .record_filename = NULL,
-        .window_title = NULL,
-        .push_target = NULL,
-        .record_format = 0,
         .help = false,
         .version = false,
-        .show_touches = false,
-        .port = DEFAULT_LOCAL_PORT,
-        .max_size = DEFAULT_MAX_SIZE,
-        .bit_rate = DEFAULT_BIT_RATE,
-        .always_on_top = false,
-        .no_control = false,
-        .no_display = false,
-        .turn_screen_off = false,
-        .render_expired_frames = false,
     };
+
     if (!parse_args(&args, argc, argv)) {
         return 1;
     }
@@ -504,25 +502,7 @@ main(int argc, char *argv[]) {
     SDL_LogSetAllPriority(SDL_LOG_PRIORITY_DEBUG);
 #endif
 
-    struct scrcpy_options options = {
+    int res = scrcpy(&args.opts) ? 0 : 1;
-        .serial = args.serial,
-        .crop = args.crop,
-        .port = args.port,
-        .record_filename = args.record_filename,
-        .window_title = args.window_title,
-        .push_target = args.push_target,
-        .record_format = args.record_format,
-        .max_size = args.max_size,
-        .bit_rate = args.bit_rate,
-        .show_touches = args.show_touches,
-        .fullscreen = args.fullscreen,
-        .always_on_top = args.always_on_top,
-        .control = !args.no_control,
-        .display = !args.no_display,
-        .turn_screen_off = args.turn_screen_off,
-        .render_expired_frames = args.render_expired_frames,
-    };
-    int res = scrcpy(&options) ? 0 : 1;
 
     avformat_network_deinit(); // ignore failure
 

app/src/recorder.c

@@ -174,9 +174,14 @@ recorder_open(struct recorder *recorder, const AVCodec *input_codec) {
 
 void
 recorder_close(struct recorder *recorder) {
-    int ret = av_write_trailer(recorder->ctx);
+    if (recorder->header_written) {
-    if (ret < 0) {
+        int ret = av_write_trailer(recorder->ctx);
-        LOGE("Failed to write trailer to %s", recorder->filename);
+        if (ret < 0) {
+            LOGE("Failed to write trailer to %s", recorder->filename);
+            recorder->failed = true;
+        }
+    } else {
+        // the recorded file is empty
         recorder->failed = true;
     }
     avio_close(recorder->ctx->pb);

app/src/recorder.h

@@ -11,7 +11,8 @@
 #include "queue.h"
 
 enum recorder_format {
-    RECORDER_FORMAT_MP4 = 1,
+    RECORDER_FORMAT_AUTO,
+    RECORDER_FORMAT_MP4,
     RECORDER_FORMAT_MKV,
 };
 

app/src/scrcpy.c

@@ -42,6 +42,7 @@ static struct input_manager input_manager = {
     .controller = &controller,
     .video_buffer = &video_buffer,
     .screen = &screen,
+    .prefer_text = false, // initialized later
 };
 
 // init SDL and set appropriate hints
@@ -145,10 +146,8 @@ handle_event(SDL_Event *event, bool control) {
         case SDL_WINDOWEVENT:
             switch (event->window.event) {
                 case SDL_WINDOWEVENT_EXPOSED:
-                    screen_render(&screen);
-                    break;
                 case SDL_WINDOWEVENT_SIZE_CHANGED:
-                    screen_window_resized(&screen);
+                    screen_render(&screen);
                     break;
             }
             break;
@@ -416,6 +415,8 @@ scrcpy(const struct scrcpy_options *options) {
         show_touches_waited = true;
     }
 
+    input_manager.prefer_text = options->prefer_text;
+
     ret = event_loop(options->display, options->control);
     LOGD("quit...");
 

app/src/scrcpy.h

@@ -3,9 +3,10 @@
 
 #include <stdbool.h>
 #include <stdint.h>
-#include <recorder.h>
 
 #include "config.h"
+#include "input_manager.h"
+#include "recorder.h"
 
 struct scrcpy_options {
     const char *serial;
@@ -24,8 +25,29 @@ struct scrcpy_options {
     bool display;
     bool turn_screen_off;
     bool render_expired_frames;
+    bool prefer_text;
 };
 
+#define SCRCPY_OPTIONS_DEFAULT { \
+    .serial = NULL, \
+    .crop = NULL, \
+    .record_filename = NULL, \
+    .window_title = NULL, \
+    .push_target = NULL, \
+    .record_format = RECORDER_FORMAT_AUTO, \
+    .port = DEFAULT_LOCAL_PORT, \
+    .max_size = DEFAULT_LOCAL_PORT, \
+    .bit_rate = DEFAULT_BIT_RATE, \
+    .show_touches = false, \
+    .fullscreen = false, \
+    .always_on_top = false, \
+    .control = true, \
+    .display = true, \
+    .turn_screen_off = false, \
+    .render_expired_frames = false, \
+    .prefer_text = false, \
+}
+
 bool
 scrcpy(const struct scrcpy_options *options);
 

app/src/screen.c

@@ -134,57 +134,16 @@ create_texture(SDL_Renderer *renderer, struct size frame_size) {
                              frame_size.width, frame_size.height);
 }
 
-#ifdef HIDPI_WORKAROUND
-static void
-screen_get_sizes(struct screen *screen, struct screen_sizes *out) {
-    int ww, wh, dw, dh;
-    SDL_GetWindowSize(screen->window, &ww, &wh);
-    SDL_GL_GetDrawableSize(screen->window, &dw, &dh);
-    out->window.width = ww;
-    out->window.height = wh;
-    out->window.width = dw;
-    out->window.height = dh;
-}
-#endif
-
-// This may be called more than once to work around SDL bugs
-static bool
-screen_init_renderer_and_texture(struct screen *screen) {
-    screen->renderer = SDL_CreateRenderer(screen->window, -1,
-                                          SDL_RENDERER_ACCELERATED);
-    if (!screen->renderer) {
-        LOGC("Could not create renderer: %s", SDL_GetError());
-        return false;
-    }
-
-    if (SDL_RenderSetLogicalSize(screen->renderer, screen->frame_size.width,
-                                 screen->frame_size.height)) {
-        LOGE("Could not set renderer logical size: %s", SDL_GetError());
-        return false;
-    }
-
-    screen->texture = create_texture(screen->renderer, screen->frame_size);
-    if (!screen->texture) {
-        LOGC("Could not create texture: %s", SDL_GetError());
-        return false;
-    }
-
-#ifdef HIDPI_WORKAROUND
-    screen_get_sizes(screen, &screen->sizes);
-#endif
-
-    return true;
-}
-
 bool
 screen_init_rendering(struct screen *screen, const char *window_title,
                       struct size frame_size, bool always_on_top) {
     screen->frame_size = frame_size;
 
     struct size window_size = get_initial_optimal_size(frame_size);
-    uint32_t window_flags = SDL_WINDOW_HIDDEN
+    uint32_t window_flags = SDL_WINDOW_HIDDEN | SDL_WINDOW_RESIZABLE;
-                          | SDL_WINDOW_RESIZABLE
+#ifdef HIDPI_SUPPORT
-                          | SDL_WINDOW_ALLOW_HIGHDPI;
+    window_flags |= SDL_WINDOW_ALLOW_HIGHDPI;
+#endif
     if (always_on_top) {
 #ifdef SCRCPY_SDL_HAS_WINDOW_ALWAYS_ON_TOP
         window_flags |= SDL_WINDOW_ALWAYS_ON_TOP;
@@ -203,6 +162,21 @@ screen_init_rendering(struct screen *screen, const char *window_title,
         return false;
     }
 
+    screen->renderer = SDL_CreateRenderer(screen->window, -1,
+                                          SDL_RENDERER_ACCELERATED);
+    if (!screen->renderer) {
+        LOGC("Could not create renderer: %s", SDL_GetError());
+        screen_destroy(screen);
+        return false;
+    }
+
+    if (SDL_RenderSetLogicalSize(screen->renderer, frame_size.width,
+                                 frame_size.height)) {
+        LOGE("Could not set renderer logical size: %s", SDL_GetError());
+        screen_destroy(screen);
+        return false;
+    }
+
     SDL_Surface *icon = read_xpm(icon_xpm);
     if (icon) {
         SDL_SetWindowIcon(screen->window, icon);
@@ -213,7 +187,9 @@ screen_init_rendering(struct screen *screen, const char *window_title,
 
     LOGI("Initial texture: %" PRIu16 "x%" PRIu16, frame_size.width,
                                                   frame_size.height);
-    if (!screen_init_renderer_and_texture(screen)) {
+    screen->texture = create_texture(screen->renderer, frame_size);
+    if (!screen->texture) {
+        LOGC("Could not create texture: %s", SDL_GetError());
         screen_destroy(screen);
         return false;
     }
@@ -302,43 +278,6 @@ screen_update_frame(struct screen *screen, struct video_buffer *vb) {
     return true;
 }
 
-#ifdef HIDPI_WORKAROUND
-// workaround for <https://github.com/Genymobile/scrcpy/issues/15>
-static inline bool
-screen_fix_hidpi(struct screen *screen) {
-    struct screen_sizes cur;
-    screen_get_sizes(screen, &cur);
-
-    struct screen_sizes *prev = &screen->sizes;
-
-    bool width_ratio_changed = cur.window.width * prev->drawable.width !=
-                               cur.drawable.width * prev->window.width;
-    bool height_ratio_changed = cur.window.height * prev->drawable.height !=
-                                cur.drawable.height * prev->window.height;
-    if (width_ratio_changed || height_ratio_changed) {
-        SDL_DestroyTexture(screen->texture);
-        SDL_DestroyRenderer(screen->renderer);
-        if (!screen_init_renderer_and_texture(screen)) {
-            screen->texture = NULL;
-            screen->renderer = NULL;
-            return false;
-        }
-
-        LOGI("Renderer reset after hidpi scaling changed");
-    }
-
-    return true;
-}
-#endif
-
-void
-screen_window_resized(struct screen *screen) {
-#ifdef HIDPI_WORKAROUND
-    screen_fix_hidpi(screen);
-#endif
-    screen_render(screen);
-}
-
 void
 screen_render(struct screen *screen) {
     SDL_RenderClear(screen->renderer);

app/src/screen.h

@@ -20,12 +20,6 @@ struct screen {
     bool has_frame;
     bool fullscreen;
     bool no_window;
-#ifdef HIDPI_WORKAROUND
-    struct screen_sizes {
-        struct size window;
-        struct size drawable;
-    } sizes;
-#endif
 };
 
 #define SCREEN_INITIALIZER {  \
@@ -66,10 +60,6 @@ screen_destroy(struct screen *screen);
 bool
 screen_update_frame(struct screen *screen, struct video_buffer *vb);
 
-// update content after window resizing
-void
-screen_window_resized(struct screen *screen);
-
 // render the texture to the renderer
 void
 screen_render(struct screen *screen);

meson_options.txt

@@ -4,5 +4,5 @@ option('crossbuild_windows', type: 'boolean', value: false, description: 'Build
 option('windows_noconsole', type: 'boolean', value: false, description: 'Disable console on Windows (pass -mwindows flag)')
 option('prebuilt_server', type: 'string', description: 'Path of the prebuilt server')
 option('portable', type: 'boolean', value: false, description: 'Use scrcpy-server from the same directory as the scrcpy executable')
+option('hidpi_support', type: 'boolean', value: true, description: 'Enable High DPI support')
 option('server_debugger', type: 'boolean', value: false, description: 'Run a server debugger and wait for a client to be attached')
-option('hidpi_workaround', type: 'boolean', value: true, description: 'Enable a workaround for bug #15')

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

@@ -7,6 +7,7 @@ import android.media.MediaCodec;
 import android.media.MediaCodecInfo;
 import android.media.MediaFormat;
 import android.os.IBinder;
+import android.os.Looper;
 import android.view.Surface;
 
 import java.io.FileDescriptor;
@@ -54,6 +55,11 @@ public class ScreenEncoder implements Device.RotationListener {
     }
 
     public void streamScreen(Device device, FileDescriptor fd) throws IOException {
+        // Some devices internally create a Handler when creating an input Surface, causing an exception:
+        // "Can't create handler inside thread that has not called Looper.prepare()"
+        // <https://github.com/Genymobile/scrcpy/issues/240>
+        Looper.prepareMainLooper();
+
         MediaFormat format = createFormat(bitRate, frameRate, iFrameInterval);
         device.setRotationListener(this);
         boolean alive;