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[gtk/wip/baedert/for-master: 28/35] css: Make GtkStyleAnimation and subclasses non-objects

commit 1b10020b6e0853f92f75c7b9bae9d08acff2b5f6
Author: Timm Bäder <mail baedert org>
Date:   Wed May 6 19:17:11 2020 +0200

    css: Make GtkStyleAnimation and subclasses non-objects
    
    Making them GObjects is unnecessary. This enables further optimizations
    down the road. The only place we use them in is gtkcssanimatedstyle.c
    after all.

 gtk/gtkcssanimatedstyle.c      | 25 ++++++++----
 gtk/gtkcssanimation.c          | 69 ++++++++++++++------------------
 gtk/gtkcssanimationprivate.h   |  8 +---
 gtk/gtkcssdynamic.c            | 40 ++++++++++---------
 gtk/gtkcssdynamicprivate.h     | 20 ----------
 gtk/gtkcsstransition.c         | 90 +++++++++++++++++++++++------------------
 gtk/gtkcsstransitionprivate.h  | 21 +---------
 gtk/gtkstyleanimation.c        | 91 ++++++++++++------------------------------
 gtk/gtkstyleanimationprivate.h | 17 ++++----
 9 files changed, 156 insertions(+), 225 deletions(-)
---
diff --git a/gtk/gtkcssanimatedstyle.c b/gtk/gtkcssanimatedstyle.c
index c04f040b0b..bef4a9028c 100644
--- a/gtk/gtkcssanimatedstyle.c
+++ b/gtk/gtkcssanimatedstyle.c
@@ -81,7 +81,7 @@ gtk_css_animated_style_dispose (GObject *object)
   guint i;
 
   for (i = 0; i < style->n_animations; i ++)
-    g_object_unref (style->animations[i]);
+    gtk_style_animation_unref (style->animations[i]);
 
   style->n_animations = 0;
   g_free (style->animations);
@@ -646,7 +646,7 @@ gtk_css_animated_style_find_transition (GtkCssAnimatedStyle *style,
     {
       GtkStyleAnimation *animation = style->animations[i];
 
-      if (!GTK_IS_CSS_TRANSITION (animation))
+      if (!_gtk_css_transition_is_transition (animation))
         continue;
 
       if (_gtk_css_transition_get_property ((GtkCssTransition *)animation) == property_id)
@@ -745,7 +745,7 @@ gtk_css_animated_style_find_animation (GtkStyleAnimation **animations,
     {
       GtkStyleAnimation *animation = animations[i];
 
-      if (!GTK_IS_CSS_ANIMATION (animation))
+      if (!_gtk_css_animation_is_animation (animation))
         continue;
 
       if (g_str_equal (_gtk_css_animation_get_name ((GtkCssAnimation *)animation), name))
@@ -765,9 +765,19 @@ gtk_css_animated_style_create_css_animations (GPtrArray        *animations,
 {
   GtkCssValue *durations, *delays, *timing_functions, *animation_names;
   GtkCssValue *iteration_counts, *directions, *play_states, *fill_modes;
+  gboolean source_is_animated;
   guint i;
 
   animation_names = base_style->animation->animation_name;
+
+  if (_gtk_css_array_value_get_n_values (animation_names) == 1)
+    {
+      const char *name = _gtk_css_ident_value_get (_gtk_css_array_value_get_nth (animation_names, 0));
+
+      if (g_ascii_strcasecmp (name, "none") == 0)
+        return animations;
+    }
+
   durations = base_style->animation->animation_duration;
   delays = base_style->animation->animation_delay;
   timing_functions = base_style->animation->animation_timing_function;
@@ -775,6 +785,7 @@ gtk_css_animated_style_create_css_animations (GPtrArray        *animations,
   directions = base_style->animation->animation_direction;
   play_states = base_style->animation->animation_play_state;
   fill_modes = base_style->animation->animation_fill_mode;
+  source_is_animated = GTK_IS_CSS_ANIMATED_STYLE (source);
 
   for (i = 0; i < _gtk_css_array_value_get_n_values (animation_names); i++)
     {
@@ -792,14 +803,14 @@ gtk_css_animated_style_create_css_animations (GPtrArray        *animations,
       if (animation)
         continue;
 
-      if (GTK_IS_CSS_ANIMATED_STYLE (source))
+      if (source_is_animated)
         animation = gtk_css_animated_style_find_animation ((GtkStyleAnimation **)GTK_CSS_ANIMATED_STYLE 
(source)->animations,
                                                            GTK_CSS_ANIMATED_STYLE (source)->n_animations,
                                                            name);
 
       if (animation)
         {
-          animation = _gtk_css_animation_advance_with_play_state (GTK_CSS_ANIMATION (animation),
+          animation = _gtk_css_animation_advance_with_play_state ((GtkCssAnimation *)animation,
                                                                   timestamp,
                                                                   _gtk_css_play_state_value_get 
(_gtk_css_array_value_get_nth (play_states, i)));
         }
@@ -825,7 +836,7 @@ gtk_css_animated_style_create_css_animations (GPtrArray        *animations,
         }
 
       if (!animations)
-        animations = g_ptr_array_new ();
+        animations = g_ptr_array_sized_new (16);
 
       g_ptr_array_add (animations, animation);
     }
@@ -928,7 +939,7 @@ gtk_css_animated_style_new_advance (GtkCssAnimatedStyle *source,
         continue;
 
       if (!animations)
-        animations = g_ptr_array_new ();
+        animations = g_ptr_array_sized_new (16);
 
       animation = _gtk_style_animation_advance (animation, timestamp);
       g_ptr_array_add (animations, animation);
diff --git a/gtk/gtkcssanimation.c b/gtk/gtkcssanimation.c
index 445b58d24d..076abd950a 100644
--- a/gtk/gtkcssanimation.c
+++ b/gtk/gtkcssanimation.c
@@ -26,8 +26,6 @@
 
 #include <math.h>
 
-G_DEFINE_TYPE (GtkCssAnimation, _gtk_css_animation, GTK_TYPE_STYLE_ANIMATION)
-
 static gboolean
 gtk_css_animation_is_executing (GtkCssAnimation *animation)
 {
@@ -80,7 +78,7 @@ static GtkStyleAnimation *
 gtk_css_animation_advance (GtkStyleAnimation    *style_animation,
                            gint64                timestamp)
 {
-  GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
+  GtkCssAnimation *animation = (GtkCssAnimation *)style_animation;
 
   return _gtk_css_animation_advance_with_play_state (animation,
                                                      timestamp,
@@ -91,7 +89,7 @@ static void
 gtk_css_animation_apply_values (GtkStyleAnimation    *style_animation,
                                 GtkCssAnimatedStyle  *style)
 {
-  GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
+  GtkCssAnimation *animation = (GtkCssAnimation *)style_animation;
   double progress;
   guint i;
 
@@ -125,7 +123,7 @@ gtk_css_animation_is_finished (GtkStyleAnimation *style_animation)
 static gboolean
 gtk_css_animation_is_static (GtkStyleAnimation *style_animation)
 {
-  GtkCssAnimation *animation = GTK_CSS_ANIMATION (style_animation);
+  GtkCssAnimation *animation = (GtkCssAnimation *)style_animation;
 
   if (animation->play_state == GTK_CSS_PLAY_STATE_PAUSED)
     return TRUE;
@@ -134,35 +132,26 @@ gtk_css_animation_is_static (GtkStyleAnimation *style_animation)
 }
 
 static void
-gtk_css_animation_finalize (GObject *object)
+gtk_css_animation_free (GtkStyleAnimation *animation)
 {
-  GtkCssAnimation *animation = GTK_CSS_ANIMATION (object);
+  GtkCssAnimation *self = (GtkCssAnimation *)animation;
 
-  g_free (animation->name);
-  _gtk_css_keyframes_unref (animation->keyframes);
-  _gtk_css_value_unref (animation->ease);
+  g_free (self->name);
+  _gtk_css_keyframes_unref (self->keyframes);
+  _gtk_css_value_unref (self->ease);
 
-  G_OBJECT_CLASS (_gtk_css_animation_parent_class)->finalize (object);
+  g_slice_free (GtkCssAnimation, self);
 }
 
-static void
-_gtk_css_animation_class_init (GtkCssAnimationClass *klass)
-{
-  GObjectClass *object_class = G_OBJECT_CLASS (klass);
-  GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
-
-  object_class->finalize = gtk_css_animation_finalize;
+static const GtkStyleAnimationClass GTK_CSS_ANIMATION_CLASS = {
+  "GtkCssAnimation",
+  gtk_css_animation_free,
+  gtk_css_animation_is_finished,
+  gtk_css_animation_is_static,
+  gtk_css_animation_apply_values,
+  gtk_css_animation_advance,
+};
 
-  animation_class->advance = gtk_css_animation_advance;
-  animation_class->apply_values = gtk_css_animation_apply_values;
-  animation_class->is_finished = gtk_css_animation_is_finished;
-  animation_class->is_static = gtk_css_animation_is_static;
-}
-
-static void
-_gtk_css_animation_init (GtkCssAnimation *animation)
-{
-}
 
 GtkStyleAnimation *
 _gtk_css_animation_new (const char      *name,
@@ -183,7 +172,9 @@ _gtk_css_animation_new (const char      *name,
   g_return_val_if_fail (ease != NULL, NULL);
   g_return_val_if_fail (iteration_count >= 0, NULL);
 
-  animation = g_object_new (GTK_TYPE_CSS_ANIMATION, NULL);
+  animation = g_slice_alloc (sizeof (GtkCssAnimation));
+  animation->parent.class = &GTK_CSS_ANIMATION_CLASS;
+  animation->parent.ref_count = 1;
 
   animation->name = g_strdup (name);
   animation->keyframes = _gtk_css_keyframes_ref (keyframes);
@@ -198,14 +189,12 @@ _gtk_css_animation_new (const char      *name,
   else
     gtk_progress_tracker_advance_frame (&animation->tracker, timestamp);
 
-  return GTK_STYLE_ANIMATION (animation);
+  return (GtkStyleAnimation *)animation;
 }
 
 const char *
 _gtk_css_animation_get_name (GtkCssAnimation *animation)
 {
-  g_return_val_if_fail (GTK_IS_CSS_ANIMATION (animation), NULL);
-
   return animation->name;
 }
 
@@ -214,11 +203,9 @@ _gtk_css_animation_advance_with_play_state (GtkCssAnimation *source,
                                             gint64           timestamp,
                                             GtkCssPlayState  play_state)
 {
-  GtkCssAnimation *animation;
-
-  g_return_val_if_fail (GTK_IS_CSS_ANIMATION (source), NULL);
-
-  animation = g_object_new (GTK_TYPE_CSS_ANIMATION, NULL);
+  GtkCssAnimation *animation = g_slice_alloc (sizeof (GtkCssAnimation));
+  animation->parent.class = &GTK_CSS_ANIMATION_CLASS;
+  animation->parent.ref_count = 1;
 
   animation->name = g_strdup (source->name);
   animation->keyframes = _gtk_css_keyframes_ref (source->keyframes);
@@ -233,5 +220,11 @@ _gtk_css_animation_advance_with_play_state (GtkCssAnimation *source,
   else
     gtk_progress_tracker_advance_frame (&animation->tracker, timestamp);
 
-  return GTK_STYLE_ANIMATION (animation);
+  return (GtkStyleAnimation *)animation;
+}
+
+gboolean
+_gtk_css_animation_is_animation (GtkStyleAnimation *animation)
+{
+  return animation->class == &GTK_CSS_ANIMATION_CLASS;
 }
diff --git a/gtk/gtkcssanimationprivate.h b/gtk/gtkcssanimationprivate.h
index 811cddfcce..ab47be8c9c 100644
--- a/gtk/gtkcssanimationprivate.h
+++ b/gtk/gtkcssanimationprivate.h
@@ -27,13 +27,6 @@
 
 G_BEGIN_DECLS
 
-#define GTK_TYPE_CSS_ANIMATION           (_gtk_css_animation_get_type ())
-#define GTK_CSS_ANIMATION(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_ANIMATION, 
GtkCssAnimation))
-#define GTK_CSS_ANIMATION_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_ANIMATION, 
GtkCssAnimationClass))
-#define GTK_IS_CSS_ANIMATION(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_ANIMATION))
-#define GTK_IS_CSS_ANIMATION_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_ANIMATION))
-#define GTK_CSS_ANIMATION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_ANIMATION, 
GtkCssAnimationClass))
-
 typedef struct _GtkCssAnimation           GtkCssAnimation;
 typedef struct _GtkCssAnimationClass      GtkCssAnimationClass;
 
@@ -73,6 +66,7 @@ GtkStyleAnimation *     _gtk_css_animation_advance_with_play_state (GtkCssAnimat
                                                                     GtkCssPlayState    play_state);
 
 const char *            _gtk_css_animation_get_name        (GtkCssAnimation   *animation);
+gboolean                _gtk_css_animation_is_animation    (GtkStyleAnimation *animation);
 
 G_END_DECLS
 
diff --git a/gtk/gtkcssdynamic.c b/gtk/gtkcssdynamic.c
index 89243b701c..5dc65101ab 100644
--- a/gtk/gtkcssdynamic.c
+++ b/gtk/gtkcssdynamic.c
@@ -20,10 +20,13 @@
 #include "config.h"
 
 #include "gtkcssdynamicprivate.h"
-
 #include "gtkprogresstrackerprivate.h"
 
-G_DEFINE_TYPE (GtkCssDynamic, gtk_css_dynamic, GTK_TYPE_STYLE_ANIMATION)
+struct _GtkCssDynamic
+{
+  GtkStyleAnimation parent;
+  gint64            timestamp;
+};
 
 static GtkStyleAnimation *
 gtk_css_dynamic_advance (GtkStyleAnimation    *style_animation,
@@ -36,13 +39,13 @@ static void
 gtk_css_dynamic_apply_values (GtkStyleAnimation    *style_animation,
                               GtkCssAnimatedStyle  *style)
 {
-  GtkCssDynamic *dynamic = GTK_CSS_DYNAMIC (style_animation);
+  GtkCssDynamic *dynamic = (GtkCssDynamic *)style_animation;
   guint i;
 
   for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i++)
     {
       GtkCssValue *value, *dynamic_value;
-      
+
       value = gtk_css_style_get_value (GTK_CSS_STYLE (style), i);
       dynamic_value = gtk_css_value_get_dynamic_value (value, dynamic->timestamp);
       if (value != dynamic_value)
@@ -65,30 +68,29 @@ gtk_css_dynamic_is_static (GtkStyleAnimation *style_animation)
 }
 
 static void
-gtk_css_dynamic_class_init (GtkCssDynamicClass *klass)
+gtk_css_dynamic_free (GtkStyleAnimation *animation)
 {
-  GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
-
-  animation_class->advance = gtk_css_dynamic_advance;
-  animation_class->apply_values = gtk_css_dynamic_apply_values;
-  animation_class->is_finished = gtk_css_dynamic_is_finished;
-  animation_class->is_static = gtk_css_dynamic_is_static;
+  g_slice_free (GtkCssDynamic, (GtkCssDynamic *)animation);
 }
 
-static void
-gtk_css_dynamic_init (GtkCssDynamic *dynamic)
-{
-}
+static const GtkStyleAnimationClass GTK_CSS_DYNAMIC_CLASS = {
+  "GtkCssDynamic",
+  gtk_css_dynamic_free,
+  gtk_css_dynamic_is_finished,
+  gtk_css_dynamic_is_static,
+  gtk_css_dynamic_apply_values,
+  gtk_css_dynamic_advance,
+};
 
 GtkStyleAnimation *
 gtk_css_dynamic_new (gint64 timestamp)
 {
-  GtkCssDynamic *dynamic;
-
-  dynamic = g_object_new (GTK_TYPE_CSS_DYNAMIC, NULL);
+  GtkCssDynamic *dynamic = g_slice_alloc (sizeof (GtkCssDynamic));
 
+  dynamic->parent.class = &GTK_CSS_DYNAMIC_CLASS;
+  dynamic->parent.ref_count = 1;
   dynamic->timestamp = timestamp;
 
-  return GTK_STYLE_ANIMATION (dynamic);
+  return (GtkStyleAnimation *)dynamic;
 }
 
diff --git a/gtk/gtkcssdynamicprivate.h b/gtk/gtkcssdynamicprivate.h
index 5b91baa32c..8f356c265a 100644
--- a/gtk/gtkcssdynamicprivate.h
+++ b/gtk/gtkcssdynamicprivate.h
@@ -26,27 +26,7 @@
 
 G_BEGIN_DECLS
 
-#define GTK_TYPE_CSS_DYNAMIC           (gtk_css_dynamic_get_type ())
-#define GTK_CSS_DYNAMIC(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_DYNAMIC, 
GtkCssDynamic))
-#define GTK_CSS_DYNAMIC_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_DYNAMIC, 
GtkCssDynamicClass))
-#define GTK_IS_CSS_DYNAMIC(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_DYNAMIC))
-#define GTK_IS_CSS_DYNAMIC_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_DYNAMIC))
-#define GTK_CSS_DYNAMIC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_DYNAMIC, 
GtkCssDynamicClass))
-
 typedef struct _GtkCssDynamic           GtkCssDynamic;
-typedef struct _GtkCssDynamicClass      GtkCssDynamicClass;
-
-struct _GtkCssDynamic
-{
-  GtkStyleAnimation   parent;
-
-  gint64              timestamp;
-};
-
-struct _GtkCssDynamicClass
-{
-  GtkStyleAnimationClass parent_class;
-};
 
 GType                   gtk_css_dynamic_get_type        (void) G_GNUC_CONST;
 
diff --git a/gtk/gtkcsstransition.c b/gtk/gtkcsstransition.c
index bb872a0b17..fee6d66d71 100644
--- a/gtk/gtkcsstransition.c
+++ b/gtk/gtkcsstransition.c
@@ -24,27 +24,22 @@
 #include "gtkcsseasevalueprivate.h"
 #include "gtkprogresstrackerprivate.h"
 
-G_DEFINE_TYPE (GtkCssTransition, _gtk_css_transition, GTK_TYPE_STYLE_ANIMATION)
-
-static GtkStyleAnimation *
-gtk_css_transition_advance (GtkStyleAnimation    *style_animation,
-                           gint64                timestamp)
+struct _GtkCssTransition
 {
-  GtkCssTransition *source = (GtkCssTransition *)style_animation;
-  GtkCssTransition *transition;
+  GtkStyleAnimation parent;
 
-  transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
+  guint               property;
+  GtkCssValue        *start;
+  GtkCssValue        *ease;
+  GtkProgressTracker  tracker;
+  guint               finished;
+};
 
-  transition->property = source->property;
-  transition->start = _gtk_css_value_ref (source->start);
-  transition->ease = _gtk_css_value_ref (source->ease);
 
-  gtk_progress_tracker_init_copy (&source->tracker, &transition->tracker);
-  gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
-  transition->finished = gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
+static GtkStyleAnimation *   gtk_css_transition_advance  (GtkStyleAnimation    *style_animation,
+                                                          gint64                timestamp);
+
 
-  return (GtkStyleAnimation *)transition;
-}
 
 static void
 gtk_css_transition_apply_values (GtkStyleAnimation   *style_animation,
@@ -99,35 +94,46 @@ gtk_css_transition_is_static (GtkStyleAnimation *animation)
 }
 
 static void
-gtk_css_transition_finalize (GObject *object)
+gtk_css_transition_free (GtkStyleAnimation *animation)
 {
-  GtkCssTransition *transition = GTK_CSS_TRANSITION (object);
+  GtkCssTransition *self = (GtkCssTransition *)animation;
 
-  _gtk_css_value_unref (transition->start);
-  _gtk_css_value_unref (transition->ease);
+  gtk_css_value_unref (self->start);
+  gtk_css_value_unref (self->ease);
 
-  G_OBJECT_CLASS (_gtk_css_transition_parent_class)->finalize (object);
+  g_slice_free (GtkCssTransition, self);
 }
 
-static void
-_gtk_css_transition_class_init (GtkCssTransitionClass *klass)
+static const GtkStyleAnimationClass GTK_CSS_TRANSITION_CLASS = {
+  "GtkCssTransition",
+  gtk_css_transition_free,
+  gtk_css_transition_is_finished,
+  gtk_css_transition_is_static,
+  gtk_css_transition_apply_values,
+  gtk_css_transition_advance,
+};
+
+static GtkStyleAnimation *
+gtk_css_transition_advance (GtkStyleAnimation    *style_animation,
+                            gint64                timestamp)
 {
-  GObjectClass *object_class = G_OBJECT_CLASS (klass);
-  GtkStyleAnimationClass *animation_class = GTK_STYLE_ANIMATION_CLASS (klass);
+  GtkCssTransition *source = (GtkCssTransition *)style_animation;
+  GtkCssTransition *transition;
 
-  object_class->finalize = gtk_css_transition_finalize;
+  transition = g_slice_alloc (sizeof (GtkCssTransition));
+  transition->parent.class = &GTK_CSS_TRANSITION_CLASS;
+  transition->parent.ref_count = 1;
 
-  animation_class->advance = gtk_css_transition_advance;
-  animation_class->apply_values = gtk_css_transition_apply_values;
-  animation_class->is_finished = gtk_css_transition_is_finished;
-  animation_class->is_static = gtk_css_transition_is_static;
-}
+  transition->property = source->property;
+  transition->start = _gtk_css_value_ref (source->start);
+  transition->ease = _gtk_css_value_ref (source->ease);
 
-static void
-_gtk_css_transition_init (GtkCssTransition *transition)
-{
-}
+  gtk_progress_tracker_init_copy (&source->tracker, &transition->tracker);
+  gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
+  transition->finished = gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
 
+  return (GtkStyleAnimation *)transition;
+}
 GtkStyleAnimation *
 _gtk_css_transition_new (guint        property,
                          GtkCssValue *start,
@@ -141,7 +147,9 @@ _gtk_css_transition_new (guint        property,
   g_return_val_if_fail (start != NULL, NULL);
   g_return_val_if_fail (ease != NULL, NULL);
 
-  transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
+  transition = g_slice_alloc (sizeof (GtkCssTransition));
+  transition->parent.class = &GTK_CSS_TRANSITION_CLASS;
+  transition->parent.ref_count = 1;
 
   transition->property = property;
   transition->start = _gtk_css_value_ref (start);
@@ -150,13 +158,17 @@ _gtk_css_transition_new (guint        property,
   gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
   transition->finished = gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
 
-  return GTK_STYLE_ANIMATION (transition);
+  return (GtkStyleAnimation*)transition;
 }
 
 guint
 _gtk_css_transition_get_property (GtkCssTransition *transition)
 {
-  g_return_val_if_fail (GTK_IS_CSS_TRANSITION (transition), 0);
-
   return transition->property;
 }
+
+gboolean
+_gtk_css_transition_is_transition (GtkStyleAnimation  *animation)
+{
+  return animation->class == &GTK_CSS_TRANSITION_CLASS;
+}
diff --git a/gtk/gtkcsstransitionprivate.h b/gtk/gtkcsstransitionprivate.h
index 6f722023a1..f50f070c7e 100644
--- a/gtk/gtkcsstransitionprivate.h
+++ b/gtk/gtkcsstransitionprivate.h
@@ -25,26 +25,8 @@
 
 G_BEGIN_DECLS
 
-#define GTK_TYPE_CSS_TRANSITION           (_gtk_css_transition_get_type ())
-#define GTK_CSS_TRANSITION(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_CSS_TRANSITION, 
GtkCssTransition))
-#define GTK_CSS_TRANSITION_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_CSS_TRANSITION, 
GtkCssTransitionClass))
-#define GTK_IS_CSS_TRANSITION(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_CSS_TRANSITION))
-#define GTK_IS_CSS_TRANSITION_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_CSS_TRANSITION))
-#define GTK_CSS_TRANSITION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_CSS_TRANSITION, 
GtkCssTransitionClass))
-
-typedef struct _GtkCssTransition           GtkCssTransition;
 typedef struct _GtkCssTransitionClass      GtkCssTransitionClass;
-
-struct _GtkCssTransition
-{
-  GtkStyleAnimation parent;
-
-  guint               property;
-  GtkCssValue        *start;
-  GtkCssValue        *ease;
-  GtkProgressTracker  tracker;
-  guint               finished;
-};
+typedef struct _GtkCssTransition           GtkCssTransition;
 
 struct _GtkCssTransitionClass
 {
@@ -61,6 +43,7 @@ GtkStyleAnimation *     _gtk_css_transition_new             (guint
                                                              gint64              delay_us);
 
 guint                   _gtk_css_transition_get_property    (GtkCssTransition   *transition);
+gboolean                _gtk_css_transition_is_transition   (GtkStyleAnimation  *animation);
 
 G_END_DECLS
 
diff --git a/gtk/gtkstyleanimation.c b/gtk/gtkstyleanimation.c
index 754f09b0c0..0ad4667b7f 100644
--- a/gtk/gtkstyleanimation.c
+++ b/gtk/gtkstyleanimation.c
@@ -21,84 +21,47 @@
 
 #include "gtkstyleanimationprivate.h"
 
-G_DEFINE_ABSTRACT_TYPE (GtkStyleAnimation, _gtk_style_animation, G_TYPE_OBJECT)
-
-static GtkStyleAnimation *
-gtk_style_animation_real_advance (GtkStyleAnimation    *animation,
-                                  gint64                timestamp)
-{
-  return NULL;
-}
-
-static void
-gtk_style_animation_real_apply_values (GtkStyleAnimation    *animation,
-                                       GtkCssAnimatedStyle  *style)
-{
-}
-
-static gboolean
-gtk_style_animation_real_is_finished (GtkStyleAnimation *animation)
-{
-  return TRUE;
-}
-
-static gboolean
-gtk_style_animation_real_is_static (GtkStyleAnimation *animation)
-{
-  return FALSE;
-}
-
-static void
-_gtk_style_animation_class_init (GtkStyleAnimationClass *klass)
-{
-  klass->advance = gtk_style_animation_real_advance;
-  klass->apply_values = gtk_style_animation_real_apply_values;
-  klass->is_finished = gtk_style_animation_real_is_finished;
-  klass->is_static = gtk_style_animation_real_is_static;
-}
-
-static void
-_gtk_style_animation_init (GtkStyleAnimation *animation)
-{
-}
-
 GtkStyleAnimation *
-_gtk_style_animation_advance (GtkStyleAnimation    *animation,
-                              gint64                timestamp)
+_gtk_style_animation_advance (GtkStyleAnimation *animation,
+                              gint64             timestamp)
 {
-  GtkStyleAnimationClass *klass;
-
-  g_return_val_if_fail (GTK_IS_STYLE_ANIMATION (animation), NULL);
+  g_assert (animation != NULL);
 
-  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
-
-  return klass->advance (animation, timestamp);
+  return animation->class->advance (animation, timestamp);
 }
 
 void
 _gtk_style_animation_apply_values (GtkStyleAnimation    *animation,
                                    GtkCssAnimatedStyle  *style)
 {
-  GtkStyleAnimationClass *klass;
-
-  g_return_if_fail (GTK_IS_STYLE_ANIMATION (animation));
-  g_return_if_fail (GTK_IS_CSS_ANIMATED_STYLE (style));
-
-  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
-
-  klass->apply_values (animation, style);
+  animation->class->apply_values (animation, style);
 }
 
 gboolean
 _gtk_style_animation_is_finished (GtkStyleAnimation *animation)
 {
-  GtkStyleAnimationClass *klass;
+  return animation->class->is_finished (animation);
+}
 
-  g_return_val_if_fail (GTK_IS_STYLE_ANIMATION (animation), TRUE);
 
-  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
+GtkStyleAnimation *
+gtk_style_animation_ref (GtkStyleAnimation *animation)
+{
+  animation->ref_count++;
+  return animation;
+}
 
-  return klass->is_finished (animation);
+GtkStyleAnimation *
+gtk_style_animation_unref (GtkStyleAnimation *animation)
+{
+  animation->ref_count--;
+
+  if (animation->ref_count == 0)
+    {
+      animation->class->free (animation);
+      return NULL;
+    }
+  return animation;
 }
 
 /**
@@ -115,9 +78,5 @@ _gtk_style_animation_is_finished (GtkStyleAnimation *animation)
 gboolean
 _gtk_style_animation_is_static (GtkStyleAnimation *animation)
 {
-  GtkStyleAnimationClass *klass;
-
-  klass = GTK_STYLE_ANIMATION_GET_CLASS (animation);
-
-  return klass->is_static (animation);
+  return animation->class->is_static (animation);
 }
diff --git a/gtk/gtkstyleanimationprivate.h b/gtk/gtkstyleanimationprivate.h
index dacb159e60..dbf8dbce40 100644
--- a/gtk/gtkstyleanimationprivate.h
+++ b/gtk/gtkstyleanimationprivate.h
@@ -24,25 +24,19 @@
 
 G_BEGIN_DECLS
 
-#define GTK_TYPE_STYLE_ANIMATION           (_gtk_style_animation_get_type ())
-#define GTK_STYLE_ANIMATION(obj)           (G_TYPE_CHECK_INSTANCE_CAST (obj, GTK_TYPE_STYLE_ANIMATION, 
GtkStyleAnimation))
-#define GTK_STYLE_ANIMATION_CLASS(cls)     (G_TYPE_CHECK_CLASS_CAST (cls, GTK_TYPE_STYLE_ANIMATION, 
GtkStyleAnimationClass))
-#define GTK_IS_STYLE_ANIMATION(obj)        (G_TYPE_CHECK_INSTANCE_TYPE (obj, GTK_TYPE_STYLE_ANIMATION))
-#define GTK_IS_STYLE_ANIMATION_CLASS(obj)  (G_TYPE_CHECK_CLASS_TYPE (obj, GTK_TYPE_STYLE_ANIMATION))
-#define GTK_STYLE_ANIMATION_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_STYLE_ANIMATION, 
GtkStyleAnimationClass))
-
 typedef struct _GtkStyleAnimation           GtkStyleAnimation;
 typedef struct _GtkStyleAnimationClass      GtkStyleAnimationClass;
 
 struct _GtkStyleAnimation
 {
-  GObject parent;
+  const GtkStyleAnimationClass *class;
+  guint ref_count;
 };
 
 struct _GtkStyleAnimationClass
 {
-  GObjectClass parent_class;
-
+  const char *type_name;
+  void          (* free)                                (GtkStyleAnimation      *animation);
   gboolean      (* is_finished)                         (GtkStyleAnimation      *animation);
   gboolean      (* is_static)                           (GtkStyleAnimation      *animation);
   void          (* apply_values)                        (GtkStyleAnimation      *animation,
@@ -60,6 +54,9 @@ void            _gtk_style_animation_apply_values       (GtkStyleAnimation
 gboolean        _gtk_style_animation_is_finished        (GtkStyleAnimation      *animation);
 gboolean        _gtk_style_animation_is_static          (GtkStyleAnimation      *animation);
 
+GtkStyleAnimation * gtk_style_animation_ref             (GtkStyleAnimation      *animation);
+GtkStyleAnimation * gtk_style_animation_unref           (GtkStyleAnimation      *animation);
+
 
 G_END_DECLS
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