win32: add an option to control window title bar state

Fixes: #11432

DOCS/interface-changes.rst

@@ -87,6 +87,7 @@ Interface changes
     - remove deprecated `--vf-defaults` and `--af-defaults` options
     - `--drm-connector` no longer allows selecting the card number (use `--drm-device`
       instead)
+    - add `--title-bar` option
  --- mpv 0.36.0 ---
     - add `--target-contrast`
     - Target luminance value is now also applied when ICC profile is used.

DOCS/man/options.rst

@@ -3135,6 +3135,12 @@ Window
     Play video with window border and decorations. Since this is on by
     default, use ``--no-border`` to disable the standard window decorations.
 
+``--title-bar``, ``--no-title-bar``
+    (Windows only)
+    Play video with the window title bar. Since this is on by default,
+    use --no-title-bar to hide the title bar. The --no-border option takes
+    precedence.
+
 ``--on-all-workspaces``
     (X11 and macOS only)
     Show the video window on all virtual desktops.

options/options.c

@@ -114,6 +114,7 @@ static const m_option_t mp_vo_opt_list[] = {
     {"ontop-level", OPT_CHOICE(ontop_level, {"window", -1}, {"system", -2},
         {"desktop", -3}), M_RANGE(0, INT_MAX)},
     {"border", OPT_BOOL(border)},
+    {"title-bar", OPT_BOOL(title_bar)},
     {"on-all-workspaces", OPT_BOOL(all_workspaces)},
     {"geometry", OPT_GEOMETRY(geometry)},
     {"autofit", OPT_SIZE_BOX(autofit)},
@@ -216,6 +217,7 @@ const struct m_sub_options vo_sub_opts = {
         .native_fs = true,
         .taskbar_progress = true,
         .border = true,
+        .title_bar = true,
         .appid = "mpv",
         .content_type = -1,
         .WinID = -1,

options/options.h

@@ -16,6 +16,7 @@ typedef struct mp_vo_opts {
     int ontop_level;
     bool fullscreen;
     bool border;
+    bool title_bar;
     bool all_workspaces;
     bool window_minimized;
     bool window_maximized;

video/out/w32_common.c

@@ -805,6 +805,8 @@ static DWORD update_style(struct vo_w32_state *w32, DWORD style)
         style |= FULLSCREEN;
     } else {
         style |= w32->opts->border ? FRAME : NO_FRAME;
+        if (!w32->opts->title_bar)
+            style &= ~WS_CAPTION;
     }
     return style;
 }
@@ -1802,7 +1804,9 @@ static int gui_thread_control(struct vo_w32_state *w32, int request, void *arg)
                 update_affinity(w32);
             } else if (changed_option == &vo_opts->ontop) {
                 update_window_state(w32);
-            } else if (changed_option == &vo_opts->border) {
+            } else if (changed_option == &vo_opts->border ||
+                       changed_option == &vo_opts->title_bar)
+            {
                 update_window_style(w32);
                 update_window_state(w32);
             } else if (changed_option == &vo_opts->window_minimized) {