win32: add an option to change window affinity

options/options.c

@@ -115,6 +115,9 @@ 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)},
+    #if HAVE_WIN32_DESKTOP
+    {"window-affinity", OPT_CHOICE(window_affinity, {"default", WDA_NONE}, {"excludefromcapture", WDA_EXCLUDEFROMCAPTURE}, {"monitor", WDA_MONITOR})},
+    #endif
     {"fit-border", OPT_BOOL(fit_border),
      .deprecation_message = "the option is ignored and no longer needed"},
     {"on-all-workspaces", OPT_BOOL(all_workspaces)},
@@ -216,6 +219,9 @@ const struct m_sub_options vo_sub_opts = {
         .hidpi_window_scale = true,
         .native_fs = true,
         .taskbar_progress = true,
+        #if HAVE_WIN32_DESKTOP
+        .window_affinity = WDA_NONE,
+		#endif
         .border = true,
         .fit_border = true,
         .appid = "mpv",

video/out/w32_common.c

@@ -963,6 +963,21 @@ static bool is_visible(HWND window)
     return GetWindowLongPtrW(window, GWL_STYLE) & WS_VISIBLE;
 }
 
+//Set the mpv window's affinity.
+//This will affect how it's displayed on the desktop and in system-level operations like taking screenshots.
+//During startup of mpv we want to avoid changing anything when its not needed, that is toggled by handleDefault
+static bool update_affinity(struct vo_w32_state *w32, bool handleDefault)
+{
+    bool affinity_result = false;
+    if (!w32 || w32->parent) {
+        return affinity_result;
+    }
+    if (w32->opts->window_affinity != WDA_NONE || handleDefault) {
+        affinity_result = SetWindowDisplayAffinity(w32->window, w32->opts->window_affinity);
+    }
+    return affinity_result;
+}
+
 static void update_window_state(struct vo_w32_state *w32)
 {
     if (w32->parent)