[gtk/transform-fixes: 635/639] Use atomic boxing instead of manual refcounting

[Benjamin Otte <otte src gnome org>]

commit 478fdaa63237d726850dd94c5bb4f486f3027952
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    Artisanal, homegrown, locally sourced, vegan reference counting has been
    replaced by the appropriate API in GLib, which does small things like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 1dfd9b9740..428132bdfb 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);
 }
 
 /**