[mutter] screen-cast/src: Add debug logging when creating buffers

[Marge Bot <marge-bot src gnome org>]

commit 38f3bf6ee289e4732029111d672c5d73bcf57a41
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Tue Jan 25 14:59:40 2022 +0100

    screen-cast/src: Add debug logging when creating buffers
    
    Add some debug logging that allows checking whether we're using DMA
    buffers for screencasting or system memory buffers. This can be useful
    for debugging screencasting performance and CPU usage.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2256>

 src/backends/meta-screen-cast-stream-src.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c
index 2efe7bc238..96fd35457e 100644
--- a/src/backends/meta-screen-cast-stream-src.c
+++ b/src/backends/meta-screen-cast-stream-src.c
@@ -859,6 +859,10 @@ on_stream_add_buffer (void             *data,
 
   if (dmabuf_handle)
     {
+      meta_topic (META_DEBUG_SCREEN_CAST,
+                  "Allocating DMA buffer for pw_stream %u",
+                  pw_stream_get_node_id (priv->pipewire_stream));
+
       spa_data[0].type = SPA_DATA_DmaBuf;
       spa_data[0].flags = SPA_DATA_FLAG_READWRITE;
       spa_data[0].fd = cogl_dma_buf_handle_get_fd (dmabuf_handle);
@@ -878,6 +882,10 @@ on_stream_add_buffer (void             *data,
           return;
         }
 
+      meta_topic (META_DEBUG_SCREEN_CAST,
+                  "Allocating MemFd buffer for pw_stream %u",
+                  pw_stream_get_node_id (priv->pipewire_stream));
+
       /* Fallback to a memfd buffer */
       spa_data[0].type = SPA_DATA_MemFd;
       spa_data[0].flags = SPA_DATA_FLAG_READWRITE;