From f19ada7b583e9bf78de38d228a956c365b5c417b Mon Sep 17 00:00:00 2001
From: DeadSix <DeadSix27@users.noreply.github.com>
Date: Fri, 22 Sep 2023 15:35:39 +0200
Subject: win32: add option to change backdrop style

---
 DOCS/man/options.rst   | 10 ++++++++++
 options/options.c      | 15 ++++++++++++---
 options/options.h      |  1 +
 video/out/w32_common.c | 17 +++++++++++++++++
 4 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index 8ffa5b3c34..681494a604 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -7110,6 +7110,16 @@ Miscellaneous
 
     This is a key/value list option. See `List Options`_ for details.
 
+``--backdrop-type=<auto|none|mica|acrylic|mica-alt>``
+    (Windows only)
+    Controls the backdrop/border style.
+
+    :auto: Default Windows behavior
+    :none: The backdrop will be black or white depending on the system's theme settings.
+    :mica: Enables the Mica style, which is the default on Windows 11.
+    :acrylic: Enables the Acrylic style (frosted glass look).
+    :mica-alt: Same as Mica, except reversed.
+
 ``--window-affinity=<default|excludefromcmcapture|monitor>``
     (Windows only)
     Controls the window affinity behavior of mpv.
diff --git a/options/options.c b/options/options.c
index 507b4b6067..e16a3a8d7d 100644
--- a/options/options.c
+++ b/options/options.c
@@ -190,14 +190,23 @@ static const m_option_t mp_vo_opt_list[] = {
         {"photo", 1}, {"video", 2}, {"game", 3})},
 #endif
 #if HAVE_WIN32_DESKTOP
-    {"window-affinity", OPT_CHOICE(window_affinity, {"default", WDA_NONE},
-        {"excludefromcapture", WDA_EXCLUDEFROMCAPTURE}, {"monitor", WDA_MONITOR})},
-    {"vo-mmcss-profile", OPT_STRING(mmcss_profile)},
 // For old MinGW-w64 compatibility
 #define DWMWCP_DEFAULT 0
 #define DWMWCP_DONOTROUND 1
 #define DWMWCP_ROUND 2
 #define DWMWCP_ROUNDSMALL 3
+
+#define DWMSBT_AUTO 0
+#define DWMSBT_NONE 1
+#define DWMSBT_MAINWINDOW 2
+#define DWMSBT_TRANSIENTWINDOW 3
+#define DWMSBT_TABBEDWINDOW 4
+
+    {"backdrop-type", OPT_CHOICE(backdrop_type, {"auto", DWMSBT_AUTO}, {"none", DWMSBT_NONE},
+        {"mica", DWMSBT_MAINWINDOW}, {"acrylic", DWMSBT_TRANSIENTWINDOW}, {"mica-alt", DWMSBT_TABBEDWINDOW})},
+    {"window-affinity", OPT_CHOICE(window_affinity, {"default", WDA_NONE},
+        {"excludefromcapture", WDA_EXCLUDEFROMCAPTURE}, {"monitor", WDA_MONITOR})},
+    {"vo-mmcss-profile", OPT_STRING(mmcss_profile)},
     {"window-corners", OPT_CHOICE(window_corners,
         {"default", DWMWCP_DEFAULT},
         {"donotround", DWMWCP_DONOTROUND},
diff --git a/options/options.h b/options/options.h
index 58c15b9f74..1453620c96 100644
--- a/options/options.h
+++ b/options/options.h
@@ -64,6 +64,7 @@ typedef struct mp_vo_opts {
     bool force_render;
     bool force_window_position;
 
+    int backdrop_type;
     int window_affinity;
     char *mmcss_profile;
     int window_corners;
diff --git a/video/out/w32_common.c b/video/out/w32_common.c
index 9664b4b980..0eafbcc4ae 100644
--- a/video/out/w32_common.c
+++ b/video/out/w32_common.c
@@ -58,7 +58,10 @@ EXTERN_C IMAGE_DOS_HEADER __ImageBase;
 #define DWMWA_USE_IMMERSIVE_DARK_MODE 20
 #endif
 
+
+//Older MinGW compatibility
 #define DWMWA_WINDOW_CORNER_PREFERENCE 33
+#define DWMWA_SYSTEMBACKDROP_TYPE 38
 
 #ifndef DPI_ENUMS_DECLARED
 typedef enum MONITOR_DPI_TYPE {
@@ -1096,6 +1099,16 @@ static void update_dark_mode(const struct vo_w32_state *w32)
                           &use_dark_mode, sizeof(use_dark_mode));
 }
 
+static void update_backdrop(const struct vo_w32_state *w32)
+{
+    if (w32->parent)
+        return;
+
+    int backdropType = w32->opts->backdrop_type;
+    DwmSetWindowAttribute(w32->window, DWMWA_SYSTEMBACKDROP_TYPE,
+                          &backdropType, sizeof(backdropType));
+}
+
 static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam,
                                 LPARAM lParam)
 {
@@ -1674,6 +1687,8 @@ static void *gui_thread(void *ptr)
     update_corners_pref(w32);
     if (w32->opts->window_affinity)
         update_affinity(w32);
+    if (w32->opts->backdrop_type)
+        update_backdrop(w32);
 
     if (SUCCEEDED(OleInitialize(NULL))) {
         ole_ok = true;
@@ -1852,6 +1867,8 @@ 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->backdrop_type) {
+                update_backdrop(w32);
             } else if (changed_option == &vo_opts->border ||
                        changed_option == &vo_opts->title_bar)
             {
-- 
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