[mutter] util: Add a SCREEN_CAST debug topic

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

commit a869df1dd7163b0d937f92230958c8a7e817e128
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Fri Feb 5 09:51:08 2021 +0100

    util: Add a SCREEN_CAST debug topic
    
    This is going to be useful to log dropped frames and other more common
    errors about screencasting.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1709>

 src/core/main.c | 1 +
 src/core/util.c | 2 ++
 src/meta/util.h | 2 ++
 3 files changed, 5 insertions(+)
---
diff --git a/src/core/main.c b/src/core/main.c
index f4ead0645e..859345af0a 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -121,6 +121,7 @@ static const GDebugKey meta_debug_keys[] = {
   { "input", META_DEBUG_INPUT },
   { "wayland", META_DEBUG_WAYLAND },
   { "kms", META_DEBUG_KMS },
+  { "screen-cast", META_DEBUG_SCREEN_CAST },
 };
 
 /*
diff --git a/src/core/util.c b/src/core/util.c
index b10f54f478..2357414936 100644
--- a/src/core/util.c
+++ b/src/core/util.c
@@ -278,6 +278,8 @@ topic_name (MetaDebugTopic topic)
       return "INPUT";
     case META_DEBUG_KMS:
       return "KMS";
+    case META_DEBUG_SCREEN_CAST:
+      return "SCREEN_CAST";
     case META_DEBUG_VERBOSE:
       return "VERBOSE";
     case META_DEBUG_WAYLAND:
diff --git a/src/meta/util.h b/src/meta/util.h
index 814d144791..a0c3edd6d8 100644
--- a/src/meta/util.h
+++ b/src/meta/util.h
@@ -77,6 +77,7 @@ void meta_fatal      (const char *format,
  * @META_DEBUG_EDGE_RESISTANCE: edge resistance
  * @META_DEBUG_WAYLAND: Wayland
  * @META_DEBUG_KMS: kernel mode setting
+ * @META_DEBUG_SCREEN_CAST: screencasting
  */
 typedef enum
 {
@@ -103,6 +104,7 @@ typedef enum
   META_DEBUG_INPUT           = 1 << 19,
   META_DEBUG_WAYLAND         = 1 << 20,
   META_DEBUG_KMS             = 1 << 21,
+  META_DEBUG_SCREEN_CAST     = 1 << 22,
 } MetaDebugTopic;
 
 /**