[gtk/transform-fixes: 1/5] Use atomic boxing instead of manual refcounting

[Emmanuele Bassi <ebassi src gnome org>]

commit e7bb0068ccb6176536e2f13fdbc39c54af05cafb
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Mar 22 11:45:57 2019 +0000

    Use atomic boxing instead of manual refcounting
    
    Artisanal, homegrown, locally sourced, vegan reference counting has been
    replaced by the appropriate API in GLib, which does small things like
    saturation and type checking.

 gsk/gsktransform.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)
---
diff --git a/gsk/gsktransform.c b/gsk/gsktransform.c
index d5e4ac4e5a..e45f21edb7 100644
--- a/gsk/gsktransform.c
+++ b/gsk/gsktransform.c
@@ -42,8 +42,7 @@ typedef struct _GskTransformClass GskTransformClass;
 struct _GskTransform
 {
   const GskTransformClass *transform_class;
-  
-  volatile int ref_count;
+
   GskTransformCategory category;
   GskTransform *next;
 };
@@ -113,10 +112,9 @@ gsk_transform_alloc (const GskTransformClass *transform_class,
 
   g_return_val_if_fail (transform_class != NULL, NULL);
 
-  self = g_malloc0 (transform_class->struct_size);
+  self = g_atomic_rc_box_alloc0 (transform_class->struct_size);
 
   self->transform_class = transform_class;
-  self->ref_count = 1;
   self->category = next ? MIN (category, next->category) : category;
   self->next = gsk_transform_is_identity (next) ? NULL : next;
 
@@ -1217,8 +1215,6 @@ gsk_transform_finalize (GskTransform *self)
   self->transform_class->finalize (self);
 
   gsk_transform_unref (self->next);
-
-  g_free (self);
 }
 
 /**
@@ -1235,9 +1231,7 @@ gsk_transform_ref (GskTransform *self)
   if (self == NULL)
     return NULL;
 
-  g_atomic_int_inc (&self->ref_count);
-
-  return self;
+  return g_atomic_rc_box_acquire (self);
 }
 
 /**
@@ -1255,8 +1249,7 @@ gsk_transform_unref (GskTransform *self)
   if (self == NULL)
     return;
 
-  if (g_atomic_int_dec_and_test (&self->ref_count))
-    gsk_transform_finalize (self);
+  g_atomic_rc_box_release_full (self, (GDestroyNotify) gsk_transform_finalize);
 }
 
 /**