[gtk+/wip/watson/progress-tracker: 1/5] csstransition: port to progress tracker

[Matthew Watson <watson src gnome org>]

commit 440ad7e544b49360d73f5875a3b17c05d3abc38f
Author: Matt Watson <mattdangerw gmail com>
Date:   Sun Mar 6 22:45:27 2016 -0800

    csstransition: port to progress tracker

 gtk/gtkcssanimatedstyle.c     |    5 +++--
 gtk/gtkcsstransition.c        |   39 +++++++++++++++++++++------------------
 gtk/gtkcsstransitionprivate.h |   15 ++++++++-------
 3 files changed, 32 insertions(+), 27 deletions(-)
---
diff --git a/gtk/gtkcssanimatedstyle.c b/gtk/gtkcssanimatedstyle.c
index 2c92fa7..e3a2260 100644
--- a/gtk/gtkcssanimatedstyle.c
+++ b/gtk/gtkcssanimatedstyle.c
@@ -301,8 +301,9 @@ gtk_css_animated_style_create_css_transitions (GSList              *animations,
       animation = _gtk_css_transition_new (i,
                                            gtk_css_style_get_value (source, i),
                                            _gtk_css_array_value_get_nth (timing_functions, i),
-                                           timestamp + delay * G_USEC_PER_SEC,
-                                           timestamp + (delay + duration) * G_USEC_PER_SEC);
+                                           timestamp,
+                                           duration * G_USEC_PER_SEC,
+                                           delay * G_USEC_PER_SEC);
       animations = g_slist_prepend (animations, animation);
     }
 
diff --git a/gtk/gtkcsstransition.c b/gtk/gtkcsstransition.c
index 747bac1..c9b3197 100644
--- a/gtk/gtkcsstransition.c
+++ b/gtk/gtkcsstransition.c
@@ -22,6 +22,7 @@
 #include "gtkcsstransitionprivate.h"
 
 #include "gtkcsseasevalueprivate.h"
+#include "gtkprogresstrackerprivate.h"
 
 G_DEFINE_TYPE (GtkCssTransition, _gtk_css_transition, GTK_TYPE_STYLE_ANIMATION)
 
@@ -33,31 +34,33 @@ gtk_css_transition_set_values (GtkStyleAnimation   *animation,
   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
   GtkCssValue *value, *end;
   double progress;
+  GtkProgressState state;
 
   end = gtk_css_animated_style_get_intrinsic_value (style, transition->property);
 
-  if (transition->start_time >= for_time_us)
+  gtk_progress_tracker_advance_frame (&transition->tracker, for_time_us);
+  state = gtk_progress_tracker_get_state (&transition->tracker);
+
+  if (state == GTK_PROGRESS_STATE_BEFORE)
     value = _gtk_css_value_ref (transition->start);
-  else if (transition->end_time > for_time_us)
+  else if (state == GTK_PROGRESS_STATE_DURING)
     {
-      progress = (double) (for_time_us - transition->start_time) / (transition->end_time - 
transition->start_time);
+      progress = gtk_progress_tracker_get_progress (&transition->tracker, FALSE);
       progress = _gtk_css_ease_value_transform (transition->ease, progress);
 
       value = _gtk_css_value_transition (transition->start,
                                          end,
                                          transition->property,
                                          progress);
-      if (value == NULL)
-        value = _gtk_css_value_ref (end);
     }
   else
-    value = NULL;
+    return;
 
-  if (value)
-    {
-      gtk_css_animated_style_set_animated_value (style, transition->property, value);
-      _gtk_css_value_unref (value);
-    }
+  if (value == NULL)
+    value = _gtk_css_value_ref (end);
+
+  gtk_css_animated_style_set_animated_value (style, transition->property, value);
+  _gtk_css_value_unref (value);
 }
 
 static gboolean
@@ -66,7 +69,7 @@ gtk_css_transition_is_finished (GtkStyleAnimation *animation,
 {
   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
 
-  return at_time_us >= transition->end_time;
+  return gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
 }
 
 static gboolean
@@ -75,7 +78,7 @@ gtk_css_transition_is_static (GtkStyleAnimation *animation,
 {
   GtkCssTransition *transition = GTK_CSS_TRANSITION (animation);
 
-  return at_time_us >= transition->end_time;
+  return gtk_progress_tracker_get_state (&transition->tracker) == GTK_PROGRESS_STATE_AFTER;
 }
 
 static void
@@ -111,22 +114,22 @@ GtkStyleAnimation *
 _gtk_css_transition_new (guint        property,
                          GtkCssValue *start,
                          GtkCssValue *ease,
-                         gint64       start_time_us,
-                         gint64       end_time_us)
+                         gint64       timestamp,
+                         gint64       duration_us,
+                         gint64       delay_us)
 {
   GtkCssTransition *transition;
 
   g_return_val_if_fail (start != NULL, NULL);
   g_return_val_if_fail (ease != NULL, NULL);
-  g_return_val_if_fail (start_time_us <= end_time_us, NULL);
 
   transition = g_object_new (GTK_TYPE_CSS_TRANSITION, NULL);
 
   transition->property = property;
   transition->start = _gtk_css_value_ref (start);
   transition->ease = _gtk_css_value_ref (ease);
-  transition->start_time = start_time_us;
-  transition->end_time = end_time_us;
+  gtk_progress_tracker_start (&transition->tracker, duration_us, delay_us, 1.0);
+  gtk_progress_tracker_advance_frame (&transition->tracker, timestamp);
 
   return GTK_STYLE_ANIMATION (transition);
 }
diff --git a/gtk/gtkcsstransitionprivate.h b/gtk/gtkcsstransitionprivate.h
index 2d075b0..822a824 100644
--- a/gtk/gtkcsstransitionprivate.h
+++ b/gtk/gtkcsstransitionprivate.h
@@ -21,6 +21,7 @@
 #define __GTK_CSS_TRANSITION_PRIVATE_H__
 
 #include "gtkstyleanimationprivate.h"
+#include "gtkprogresstrackerprivate.h"
 
 G_BEGIN_DECLS
 
@@ -38,11 +39,10 @@ struct _GtkCssTransition
 {
   GtkStyleAnimation parent;
 
-  guint        property;
-  GtkCssValue *start;
-  GtkCssValue *ease;
-  gint64       start_time;
-  gint64       end_time;
+  guint               property;
+  GtkCssValue        *start;
+  GtkCssValue        *ease;
+  GtkProgressTracker  tracker;
 };
 
 struct _GtkCssTransitionClass
@@ -55,8 +55,9 @@ GType                   _gtk_css_transition_get_type        (void) G_GNUC_CONST;
 GtkStyleAnimation *     _gtk_css_transition_new             (guint               property,
                                                              GtkCssValue        *start,
                                                              GtkCssValue        *ease,
-                                                             gint64              start_time_us,
-                                                             gint64              end_time_us);
+                                                             gint64              timestamp,
+                                                             gint64              duration_us,
+                                                             gint64              delay_us);
 
 guint                   _gtk_css_transition_get_property    (GtkCssTransition   *transition);