new/yocto/meta-rockchip/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.20/0019-waylandsink-Support-window-alpha-property.patch

From 2319581d4848e5763abe25059ad43148baa95aaf Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Tue, 28 Dec 2021 14:06:19 +0800
Subject: [PATCH 19/33] waylandsink: Support window alpha property

Tested with:
gst-launch-1.0 videotestsrc ! waylandsink alpha=0.5

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 ext/wayland/gstwaylandsink.c | 32 ++++++++++++++++++++++++++++++++
 ext/wayland/gstwaylandsink.h |  1 +
 ext/wayland/wlwindow.c       | 23 ++++++++++++++++-------
 ext/wayland/wlwindow.h       |  1 +
 4 files changed, 50 insertions(+), 7 deletions(-)

diff --git a/ext/wayland/gstwaylandsink.c b/ext/wayland/gstwaylandsink.c
index 1bf4511..ff79ddf 100644
--- a/ext/wayland/gstwaylandsink.c
+++ b/ext/wayland/gstwaylandsink.c
@@ -65,6 +65,7 @@ enum
   PROP_DISPLAY,
   PROP_FULLSCREEN,
   PROP_LAYER,
+  PROP_ALPHA,
   PROP_LAST
 };
 
@@ -238,6 +239,11 @@ gst_wayland_sink_class_init (GstWaylandSinkClass * klass)
           GST_TYPE_WL_WINDOW_LAYER, GST_WL_WINDOW_LAYER_NORMAL,
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
+  g_object_class_install_property (gobject_class, PROP_ALPHA,
+      g_param_spec_double ("alpha", "Window alpha",
+          "Wayland window alpha", 0.0, 1.0, 1.0,
+          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
+
   gst_video_overlay_install_properties (gobject_class, PROP_LAST);
 
   gst_type_mark_as_plugin_api (GST_TYPE_WAYLAND_VIDEO, 0);
@@ -251,6 +257,7 @@ gst_wayland_sink_init (GstWaylandSink * sink)
 
   sink->window_handle = 1;
   sink->layer = GST_WL_WINDOW_LAYER_NORMAL;
+  sink->alpha = 1.0;
 }
 
 static void
@@ -277,6 +284,18 @@ gst_wayland_sink_set_layer (GstWaylandSink * sink, GstWlWindowLayer layer)
   g_mutex_unlock (&sink->render_lock);
 }
 
+static void
+gst_wayland_sink_set_alpha (GstWaylandSink * sink, gdouble alpha)
+{
+  if (alpha == sink->alpha)
+    return;
+
+  g_mutex_lock (&sink->render_lock);
+  sink->alpha = alpha;
+  gst_wl_window_ensure_alpha (sink->window, alpha);
+  g_mutex_unlock (&sink->render_lock);
+}
+
 static void
 gst_wayland_sink_get_property (GObject * object,
     guint prop_id, GValue * value, GParamSpec * pspec)
@@ -299,6 +318,11 @@ gst_wayland_sink_get_property (GObject * object,
       g_value_set_enum (value, sink->layer);
       GST_OBJECT_UNLOCK (sink);
       break;
+    case PROP_ALPHA:
+      GST_OBJECT_LOCK (sink);
+      g_value_set_double (value, sink->alpha);
+      GST_OBJECT_UNLOCK (sink);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
@@ -327,6 +351,11 @@ gst_wayland_sink_set_property (GObject * object,
       gst_wayland_sink_set_layer (sink, g_value_get_enum (value));
       GST_OBJECT_UNLOCK (sink);
       break;
+    case PROP_ALPHA:
+      GST_OBJECT_LOCK (sink);
+      gst_wayland_sink_set_alpha (sink, g_value_get_double (value));
+      GST_OBJECT_UNLOCK (sink);
+      break;
     default:
       if (!gst_video_overlay_set_property (object, PROP_LAST, prop_id, value))
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
@@ -783,6 +812,8 @@ gst_wayland_sink_show_frame (GstVideoSink * vsink, GstBuffer * buffer)
       sink->window = gst_wl_window_new_toplevel (sink->display,
           &sink->video_info, sink->fullscreen, sink->layer,
           &sink->render_lock, &sink->render_rectangle);
+      gst_wl_window_ensure_alpha (sink->window, sink->alpha);
+
       g_signal_connect_object (sink->window, "closed",
           G_CALLBACK (on_window_closed), sink, 0);
     }
@@ -1035,6 +1066,7 @@ gst_wayland_sink_set_window_handle (GstVideoOverlay * overlay, guintptr handle)
       } else {
         sink->window = gst_wl_window_new_in_surface (sink->display, surface,
             &sink->render_lock);
+        gst_wl_window_ensure_alpha (sink->window, sink->alpha);
 
         if (sink->last_buffer) {
           /* Resend video info to force resize video surface */
diff --git a/ext/wayland/gstwaylandsink.h b/ext/wayland/gstwaylandsink.h
index 3adddf2..f798969 100644
--- a/ext/wayland/gstwaylandsink.h
+++ b/ext/wayland/gstwaylandsink.h
@@ -63,6 +63,7 @@ struct _GstWaylandSink
   GstVideoInfo video_info;
   gboolean fullscreen;
   GstWlWindowLayer layer;
+  gdouble alpha;
 
   gchar *display_name;
 
diff --git a/ext/wayland/wlwindow.c b/ext/wayland/wlwindow.c
index 7f7f3b6..58e65dd 100644
--- a/ext/wayland/wlwindow.c
+++ b/ext/wayland/wlwindow.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "wlwindow.h"
@@ -235,19 +236,25 @@ gst_wl_window_new_internal (GstWlDisplay * display, GMutex * render_lock)
 }
 
 static void
-gst_wl_window_set_flags (GstWlWindow * window, const char *flags)
+gst_wl_window_set_config (GstWlWindow * window, const char *config)
 {
-  /* HACK: set window flags through title */
-  char s[128] = "flags=";
-  strcat (s, flags);
-
+  /* HACK: set window config through title */
   if (!window)
     return;
 
   if (window->xdg_toplevel)
-    xdg_toplevel_set_title (window->xdg_toplevel, s);
+    xdg_toplevel_set_title (window->xdg_toplevel, config);
   else if (window->wl_shell_surface)
-    wl_shell_surface_set_title (window->wl_shell_surface, s);
+    wl_shell_surface_set_title (window->wl_shell_surface, config);
+}
+
+void
+gst_wl_window_ensure_alpha (GstWlWindow * window, gdouble alpha)
+{
+  char s[128];
+
+  snprintf (s, sizeof (s), "attrs=alpha:%f;", alpha);
+  gst_wl_window_set_config (window, s);
 }
 
 void
@@ -268,6 +275,8 @@ gst_wl_window_ensure_layer (GstWlWindow * window, GstWlWindowLayer layer)
     default:
       return;
   }
+
+  gst_wl_window_set_config (window, s);
 }
 
 void
diff --git a/ext/wayland/wlwindow.h b/ext/wayland/wlwindow.h
index 97ea79e..6fb8285 100644
--- a/ext/wayland/wlwindow.h
+++ b/ext/wayland/wlwindow.h
@@ -87,6 +87,7 @@ typedef enum
   GST_WL_WINDOW_LAYER_BOTTOM = 2,
 } GstWlWindowLayer;
 
+void gst_wl_window_ensure_alpha (GstWlWindow * window, gdouble alpha);
 void gst_wl_window_ensure_layer (GstWlWindow * window,
         GstWlWindowLayer layer);
 void gst_wl_window_ensure_fullscreen (GstWlWindow * window,
-- 
2.20.1