xref: /OK3568_Linux_fs/yocto/meta-rockchip/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.20/0036-waylandsink-Support-transparent-video.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From 499e9f7b9caa1e47194f8043d607f71eef2248bb Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Fri, 5 Aug 2022 11:39:00 +0800
Subject: [PATCH 36/36] waylandsink: Support transparent video

Tested with transparent png picture.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 ext/wayland/wlwindow.c | 32 ++++++++++++++++++++++----------
 ext/wayland/wlwindow.h |  3 +++
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/ext/wayland/wlwindow.c b/ext/wayland/wlwindow.c
index ba1046a..330579f 100644
--- a/ext/wayland/wlwindow.c
+++ b/ext/wayland/wlwindow.c
@@ -528,17 +528,19 @@ gst_wl_window_resize_video_surface (GstWlWindow * window, gboolean commit)
 }

 static void
-gst_wl_window_set_opaque (GstWlWindow * window, const GstVideoInfo * info)
+gst_wl_window_set_opaque (GstWlWindow * window)
 {
   struct wl_region *region;

-  /* Set area opaque */
-  region = wl_compositor_create_region (window->display->compositor);
-  wl_region_add (region, 0, 0, G_MAXINT32, G_MAXINT32);
-  wl_surface_set_opaque_region (window->area_surface, region);
-  wl_region_destroy (region);
+  if (window->area_opaque) {
+    /* Set area opaque */
+    region = wl_compositor_create_region (window->display->compositor);
+    wl_region_add (region, 0, 0, G_MAXINT32, G_MAXINT32);
+    wl_surface_set_opaque_region (window->area_surface, region);
+    wl_region_destroy (region);
+  }

-  if (!GST_VIDEO_INFO_HAS_ALPHA (info)) {
+  if (window->video_opaque) {
     /* Set video opaque */
     region = wl_compositor_create_region (window->display->compositor);
     wl_region_add (region, 0, 0, G_MAXINT32, G_MAXINT32);
@@ -554,10 +556,15 @@ gst_wl_window_render (GstWlWindow * window, GstWlBuffer * buffer,
   if (G_UNLIKELY (info)) {
     window->video_width = info->width;
     window->video_height = info->height;
+    window->video_opaque = !GST_VIDEO_INFO_HAS_ALPHA (info);
+    window->area_opaque = window->video_opaque;
+
+    if (g_getenv ("WAYLANDSINK_FORCE_OPAQUE"))
+      window->area_opaque = window->video_opaque = TRUE;

     wl_subsurface_set_sync (window->video_subsurface);
     gst_wl_window_resize_video_surface (window, FALSE);
-    gst_wl_window_set_opaque (window, info);
+    gst_wl_window_set_opaque (window);
   } else if (window->crop_dirty) {
     gst_wl_window_resize_video_surface (window, FALSE);
   }
@@ -624,8 +631,13 @@ gst_wl_window_update_borders (GstWlWindow * window)
     height = window->render_rectangle.h;
   }

-  /* we want WL_SHM_FORMAT_XRGB8888 */
-  format = GST_VIDEO_FORMAT_BGRx;
+  if (window->area_opaque) {
+    /* we want WL_SHM_FORMAT_XRGB8888 */
+    format = GST_VIDEO_FORMAT_BGRx;
+  } else {
+    /* we want WL_SHM_FORMAT_ARGB8888 */
+    format = GST_VIDEO_FORMAT_BGRA;
+  }

   /* draw the area_subsurface */
   gst_video_info_set_format (&info, format, width, height);
diff --git a/ext/wayland/wlwindow.h b/ext/wayland/wlwindow.h
index 672e15a..66b69f4 100644
--- a/ext/wayland/wlwindow.h
+++ b/ext/wayland/wlwindow.h
@@ -77,6 +77,9 @@ struct _GstWlWindow
   gint crop_x, crop_y, crop_w, crop_h;
   gboolean crop_dirty;

+  gboolean video_opaque;
+  gboolean area_opaque;
+
   /* when this is not set both the area_surface and the video_surface are not
    * visible and certain steps should be skipped */
   gboolean is_area_surface_mapped;
--
2.20.1