[mutter] cogl/snippet: Make API introspectable

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

commit 2fd63724af53805cbd0d33059d21ca4fb7896bc5
Author: Simon Schneegans <code simonschneegans de>
Date:   Wed May 18 07:43:58 2022 +0200

    cogl/snippet: Make API introspectable
    
    This change ensures that the Snippet API of Cogl is exposed to GJS,
    making it possible to create custom shader programs in GJS.
    
    Related: https://gitlab.gnome.org/GNOME/mutter/-/issues/2280
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2422>

 cogl/cogl/cogl-snippet.h | 18 +++++++++---------
 cogl/cogl/meson.build    |  2 +-
 2 files changed, 10 insertions(+), 10 deletions(-)
---
diff --git a/cogl/cogl/cogl-snippet.h b/cogl/cogl/cogl-snippet.h
index 2d14b91fba..5965fc6297 100644
--- a/cogl/cogl/cogl-snippet.h
+++ b/cogl/cogl/cogl-snippet.h
@@ -679,14 +679,14 @@ typedef enum
  * cogl_snippet_new:
  * @hook: The point in the pipeline that this snippet will wrap around
  *   or replace.
- * @declarations: The source code for the declarations for this
+ * @declarations: (nullable): The source code for the declarations for this
  *   snippet or %NULL. See cogl_snippet_set_declarations().
- * @post: The source code to run after the hook point where this
+ * @post: (nullable): The source code to run after the hook point where this
  *   shader snippet is attached or %NULL. See cogl_snippet_set_post().
  *
  * Allocates and initializes a new snippet with the given source strings.
  *
- * Return value: a pointer to a new #CoglSnippet
+ * Return value: (transfer full): a pointer to a new #CoglSnippet
  *
  * Since: 1.10
  * Stability: Unstable
@@ -700,8 +700,8 @@ cogl_snippet_new (CoglSnippetHook hook,
  * cogl_snippet_get_hook:
  * @snippet: A #CoglSnippet
  *
- * Return value: the hook that was set when cogl_snippet_new() was
- *   called.
+ * Return value: (transfer none): the hook that was set when cogl_snippet_new()
+ *   was called.
  * Since: 1.10
  * Stability: Unstable
  */
@@ -749,7 +749,7 @@ cogl_snippet_set_declarations (CoglSnippet *snippet,
  * cogl_snippet_get_declarations:
  * @snippet: A #CoglSnippet
  *
- * Return value: the source string that was set with
+ * Return value: (transfer none): the source string that was set with
  *   cogl_snippet_set_declarations() or %NULL if none was set.
  *
  * Since: 1.10
@@ -783,7 +783,7 @@ cogl_snippet_set_pre (CoglSnippet *snippet,
  * cogl_snippet_get_pre:
  * @snippet: A #CoglSnippet
  *
- * Return value: the source string that was set with
+ * Return value: (transfer none): the source string that was set with
  *   cogl_snippet_set_pre() or %NULL if none was set.
  *
  * Since: 1.10
@@ -817,7 +817,7 @@ cogl_snippet_set_replace (CoglSnippet *snippet,
  * cogl_snippet_get_replace:
  * @snippet: A #CoglSnippet
  *
- * Return value: the source string that was set with
+ * Return value: (transfer none): the source string that was set with
  *   cogl_snippet_set_replace() or %NULL if none was set.
  *
  * Since: 1.10
@@ -851,7 +851,7 @@ cogl_snippet_set_post (CoglSnippet *snippet,
  * cogl_snippet_get_post:
  * @snippet: A #CoglSnippet
  *
- * Return value: the source string that was set with
+ * Return value: (transfer none): the source string that was set with
  *   cogl_snippet_set_post() or %NULL if none was set.
  *
  * Since: 1.10
diff --git a/cogl/cogl/meson.build b/cogl/cogl/meson.build
index fa34eac52d..3618524a9e 100644
--- a/cogl/cogl/meson.build
+++ b/cogl/cogl/meson.build
@@ -82,6 +82,7 @@ cogl_headers = [
   'cogl-pipeline-state.h',
   'cogl-pipeline-layer-state.h',
   'cogl-pixel-format.h',
+  'cogl-snippet.h',
   'cogl-texture.h',
   'cogl-texture-2d.h',
   'cogl-texture-2d-sliced.h',
@@ -96,7 +97,6 @@ cogl_nonintrospected_headers = [
   'cogl-onscreen-template.h',
   'cogl-dma-buf-handle.h',
   'cogl-display.h',
-  'cogl-snippet.h',
   'cogl-index-buffer.h',
   'cogl-attribute-buffer.h',
   'cogl-indices.h',