[clutter/remove-alpha: 1/3] Move the easing functions to their own file
- From: Emmanuele Bassi <ebassi src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [clutter/remove-alpha: 1/3] Move the easing functions to their own file
- Date: Fri, 7 Oct 2011 16:45:15 +0000 (UTC)
commit 632196e5af302b9ba0ac650e627f13c7ebfd93a2
Author: Emmanuele Bassi <ebassi gnome org>
Date: Tue Jul 12 12:32:18 2011 +0100
Move the easing functions to their own file
We can use a single wrapper to go from ClutterAlphaFunc to the common
format for easing functions.
clutter/Makefile.am | 2 +
clutter/clutter-alpha.c | 541 ++++------------------------------------------
clutter/clutter-easing.c | 380 ++++++++++++++++++++++++++++++++
clutter/clutter-easing.h | 73 +++++++
4 files changed, 503 insertions(+), 493 deletions(-)
---
diff --git a/clutter/Makefile.am b/clutter/Makefile.am
index d9b81a8..90512fd 100644
--- a/clutter/Makefile.am
+++ b/clutter/Makefile.am
@@ -228,6 +228,7 @@ source_h_priv = \
$(srcdir)/clutter-bezier.h \
$(srcdir)/clutter-debug.h \
$(srcdir)/clutter-device-manager-private.h \
+ $(srcdir)/clutter-easing.h \
$(srcdir)/clutter-effect-private.h \
$(srcdir)/clutter-event-translator.h \
$(srcdir)/clutter-event-private.h \
@@ -247,6 +248,7 @@ source_h_priv = \
# private source code; these should not be introspected
source_c_priv = \
+ $(srcdir)/clutter-easing.c \
$(srcdir)/clutter-event-translator.c \
$(srcdir)/clutter-id-pool.c \
$(srcdir)/clutter-profile.c \
diff --git a/clutter/clutter-alpha.c b/clutter/clutter-alpha.c
index a99cfc9..2624c21 100644
--- a/clutter/clutter-alpha.c
+++ b/clutter/clutter-alpha.c
@@ -108,6 +108,7 @@
#include "clutter-alpha.h"
#include "clutter-debug.h"
#include "clutter-enum-types.h"
+#include "clutter-easing.h"
#include "clutter-main.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
@@ -436,7 +437,7 @@ clutter_alpha_get_alpha (ClutterAlpha *alpha)
g_value_init (¶ms, CLUTTER_TYPE_ALPHA);
g_value_set_object (¶ms, alpha);
-
+
g_closure_invoke (priv->closure, &result_value, 1, ¶ms, NULL);
retval = g_value_get_double (&result_value);
@@ -486,7 +487,7 @@ clutter_alpha_set_closure_internal (ClutterAlpha *alpha,
{
GClosureMarshal marshal = _clutter_marshal_DOUBLE__VOID;
- g_closure_set_marshal (closure, marshal);
+ g_closure_set_marshal (priv->closure, marshal);
}
}
@@ -729,465 +730,6 @@ clutter_alpha_get_mode (ClutterAlpha *alpha)
return alpha->priv->mode;
}
-static gdouble
-clutter_linear (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
-
- return clutter_timeline_get_progress (timeline);
-}
-
-static gdouble
-clutter_ease_in_quad (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble progress = clutter_timeline_get_progress (timeline);
-
- return progress * progress;
-}
-
-static gdouble
-clutter_ease_out_quad (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return -1.0 * p * (p - 2);
-}
-
-static gdouble
-clutter_ease_in_out_quad (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
-
- if (p < 1)
- return 0.5 * p * p;
-
- p -= 1;
-
- return -0.5 * (p * (p - 2) - 1);
-}
-
-static gdouble
-clutter_ease_in_cubic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return p * p * p;
-}
-
-static gdouble
-clutter_ease_out_cubic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / d - 1;
-
- return p * p * p + 1;
-}
-
-static gdouble
-clutter_ease_in_out_cubic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
-
- if (p < 1)
- return 0.5 * p * p * p;
-
- p -= 2;
-
- return 0.5 * (p * p * p + 2);
-}
-
-static gdouble
-clutter_ease_in_quart (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return p * p * p * p;
-}
-
-static gdouble
-clutter_ease_out_quart (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / d - 1;
-
- return -1.0 * (p * p * p * p - 1);
-}
-
-static gdouble
-clutter_ease_in_out_quart (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
-
- if (p < 1)
- return 0.5 * p * p * p * p;
-
- p -= 2;
-
- return -0.5 * (p * p * p * p - 2);
-}
-
-static gdouble
-clutter_ease_in_quint (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
- {
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return p * p * p * p * p;
-}
-
-static gdouble
-clutter_ease_out_quint (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / d - 1;
-
- return p * p * p * p * p + 1;
-}
-
-static gdouble
-clutter_ease_in_out_quint (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
-
- if (p < 1)
- return 0.5 * p * p * p * p * p;
-
- p -= 2;
-
- return 0.5 * (p * p * p * p * p + 2);
-}
-
-static gdouble
-clutter_ease_in_sine (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return -1.0 * cos (t / d * G_PI_2) + 1.0;
-}
-
-static gdouble
-clutter_ease_out_sine (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return sin (t / d * G_PI_2);
-}
-
-static gdouble
-clutter_ease_in_out_sine (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return -0.5 * (cos (G_PI * t / d) - 1);
-}
-
-static gdouble
-clutter_ease_in_expo (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return (t == 0) ? 0.0 : pow (2, 10 * (t / d - 1));
-}
-
-static gdouble
-clutter_ease_out_expo (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return (t == d) ? 1.0 : -pow (2, -10 * t / d) + 1;
-}
-
-static gdouble
-clutter_ease_in_out_expo (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p;
-
- if (t == 0)
- return 0.0;
-
- if (t == d)
- return 1.0;
-
- p = t / (d / 2);
-
- if (p < 1)
- return 0.5 * pow (2, 10 * (p - 1));
-
- p -= 1;
-
- return 0.5 * (-pow (2, -10 * p) + 2);
-}
-
-static gdouble
-clutter_ease_in_circ (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return -1.0 * (sqrt (1 - p * p) - 1);
-}
-
-static gdouble
-clutter_ease_out_circ (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / d - 1;
-
- return sqrt (1 - p * p);
-}
-
-static gdouble
-clutter_ease_in_out_circ (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
-
- if (p < 1)
- return -0.5 * (sqrt (1 - p * p) - 1);
-
- p -= 2;
-
- return 0.5 * (sqrt (1 - p * p) + 1);
-}
-
-static gdouble
-clutter_ease_in_elastic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = d * .3;
- gdouble s = p / 4;
- gdouble q = t / d;
-
- if (q == 1)
- return 1.0;
-
- q -= 1;
-
- return -(pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
-}
-
-static gdouble
-clutter_ease_out_elastic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = d * .3;
- gdouble s = p / 4;
- gdouble q = t / d;
-
- if (q == 1)
- return 1.0;
-
- return pow (2, -10 * q) * sin ((q * d - s) * (2 * G_PI) / p) + 1.0;
-}
-
-static gdouble
-clutter_ease_in_out_elastic (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = d * (.3 * 1.5);
- gdouble s = p / 4;
- gdouble q = t / (d / 2);
-
- if (q == 2)
- return 1.0;
-
- if (q < 1)
- {
- q -= 1;
-
- return -.5 * (pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
- }
- else
- {
- q -= 1;
-
- return pow (2, -10 * q)
- * sin ((q * d - s) * (2 * G_PI) / p)
- * .5 + 1.0;
- }
-}
-
-static gdouble
-clutter_ease_in_back (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble p = clutter_timeline_get_progress (timeline);
-
- return p * p * ((1.70158 + 1) * p - 1.70158);
-}
-
-static gdouble
-clutter_ease_out_back (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / d - 1;
-
- return p * p * ((1.70158 + 1) * p + 1.70158) + 1;
-}
-
-static gdouble
-clutter_ease_in_out_back (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
- gdouble p = t / (d / 2);
- gdouble s = 1.70158 * 1.525;
-
- if (p < 1)
- return 0.5 * (p * p * ((s + 1) * p - s));
-
- p -= 2;
-
- return 0.5 * (p * p * ((s + 1) * p + s) + 2);
-}
-
-static gdouble
-ease_out_bounce_internal (gdouble t,
- gdouble d)
-{
- gdouble p = t / d;
-
- if (p < (1 / 2.75))
- return 7.5625 * p * p;
- else if (p < (2 / 2.75))
- {
- p -= (1.5 / 2.75);
-
- return 7.5625 * p * p + .75;
- }
- else if (p < (2.5 / 2.75))
- {
- p -= (2.25 / 2.75);
-
- return 7.5625 * p * p + .9375;
- }
- else
- {
- p -= (2.625 / 2.75);
-
- return 7.5625 * p * p + .984375;
- }
-}
-
-static gdouble
-ease_in_bounce_internal (gdouble t,
- gdouble d)
-{
- return 1.0 - ease_out_bounce_internal (d - t, d);
-}
-
-static gdouble
-clutter_ease_in_bounce (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return ease_in_bounce_internal (t, d);
-}
-
-static gdouble
-clutter_ease_out_bounce (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- return ease_out_bounce_internal (t, d);
-}
-
-static gdouble
-clutter_ease_in_out_bounce (ClutterAlpha *alpha,
- gpointer dummy G_GNUC_UNUSED)
-{
- ClutterTimeline *timeline = alpha->priv->timeline;
- gdouble t = clutter_timeline_get_elapsed_time (timeline);
- gdouble d = clutter_timeline_get_duration (timeline);
-
- if (t < d / 2)
- return ease_in_bounce_internal (t * 2, d) * 0.5;
- else
- return ease_out_bounce_internal (t * 2 - d, d) * 0.5 + 1.0 * 0.5;
-}
-
/* static enum/function mapping table for the animation modes
* we provide internally
*
@@ -1195,41 +737,41 @@ clutter_ease_in_out_bounce (ClutterAlpha *alpha,
*/
static const struct {
gulong mode;
- ClutterAlphaFunc func;
+ gpointer func;
} animation_modes[] = {
{ CLUTTER_CUSTOM_MODE, NULL },
- { CLUTTER_LINEAR, clutter_linear },
- { CLUTTER_EASE_IN_QUAD, clutter_ease_in_quad },
- { CLUTTER_EASE_OUT_QUAD, clutter_ease_out_quad },
- { CLUTTER_EASE_IN_OUT_QUAD, clutter_ease_in_out_quad },
- { CLUTTER_EASE_IN_CUBIC, clutter_ease_in_cubic },
- { CLUTTER_EASE_OUT_CUBIC, clutter_ease_out_cubic },
- { CLUTTER_EASE_IN_OUT_CUBIC, clutter_ease_in_out_cubic },
- { CLUTTER_EASE_IN_QUART, clutter_ease_in_quart },
- { CLUTTER_EASE_OUT_QUART, clutter_ease_out_quart },
- { CLUTTER_EASE_IN_OUT_QUART, clutter_ease_in_out_quart },
- { CLUTTER_EASE_IN_QUINT, clutter_ease_in_quint },
- { CLUTTER_EASE_OUT_QUINT, clutter_ease_out_quint },
- { CLUTTER_EASE_IN_OUT_QUINT, clutter_ease_in_out_quint },
- { CLUTTER_EASE_IN_SINE, clutter_ease_in_sine },
- { CLUTTER_EASE_OUT_SINE, clutter_ease_out_sine },
- { CLUTTER_EASE_IN_OUT_SINE, clutter_ease_in_out_sine },
- { CLUTTER_EASE_IN_EXPO, clutter_ease_in_expo },
- { CLUTTER_EASE_OUT_EXPO, clutter_ease_out_expo },
- { CLUTTER_EASE_IN_OUT_EXPO, clutter_ease_in_out_expo },
- { CLUTTER_EASE_IN_CIRC, clutter_ease_in_circ },
- { CLUTTER_EASE_OUT_CIRC, clutter_ease_out_circ },
- { CLUTTER_EASE_IN_OUT_CIRC, clutter_ease_in_out_circ },
- { CLUTTER_EASE_IN_ELASTIC, clutter_ease_in_elastic },
- { CLUTTER_EASE_OUT_ELASTIC, clutter_ease_out_elastic },
- { CLUTTER_EASE_IN_OUT_ELASTIC, clutter_ease_in_out_elastic },
- { CLUTTER_EASE_IN_BACK, clutter_ease_in_back },
- { CLUTTER_EASE_OUT_BACK, clutter_ease_out_back },
- { CLUTTER_EASE_IN_OUT_BACK, clutter_ease_in_out_back },
- { CLUTTER_EASE_IN_BOUNCE, clutter_ease_in_bounce },
- { CLUTTER_EASE_OUT_BOUNCE, clutter_ease_out_bounce },
- { CLUTTER_EASE_IN_OUT_BOUNCE, clutter_ease_in_out_bounce },
+ { CLUTTER_LINEAR, _clutter_linear },
+ { CLUTTER_EASE_IN_QUAD, _clutter_ease_in_quad },
+ { CLUTTER_EASE_OUT_QUAD, _clutter_ease_out_quad },
+ { CLUTTER_EASE_IN_OUT_QUAD, _clutter_ease_in_out_quad },
+ { CLUTTER_EASE_IN_CUBIC, _clutter_ease_in_cubic },
+ { CLUTTER_EASE_OUT_CUBIC, _clutter_ease_out_cubic },
+ { CLUTTER_EASE_IN_OUT_CUBIC, _clutter_ease_in_out_cubic },
+ { CLUTTER_EASE_IN_QUART, _clutter_ease_in_quart },
+ { CLUTTER_EASE_OUT_QUART, _clutter_ease_out_quart },
+ { CLUTTER_EASE_IN_OUT_QUART, _clutter_ease_in_out_quart },
+ { CLUTTER_EASE_IN_QUINT, _clutter_ease_in_quint },
+ { CLUTTER_EASE_OUT_QUINT, _clutter_ease_out_quint },
+ { CLUTTER_EASE_IN_OUT_QUINT, _clutter_ease_in_out_quint },
+ { CLUTTER_EASE_IN_SINE, _clutter_ease_in_sine },
+ { CLUTTER_EASE_OUT_SINE, _clutter_ease_out_sine },
+ { CLUTTER_EASE_IN_OUT_SINE, _clutter_ease_in_out_sine },
+ { CLUTTER_EASE_IN_EXPO, _clutter_ease_in_expo },
+ { CLUTTER_EASE_OUT_EXPO, _clutter_ease_out_expo },
+ { CLUTTER_EASE_IN_OUT_EXPO, _clutter_ease_in_out_expo },
+ { CLUTTER_EASE_IN_CIRC, _clutter_ease_in_circ },
+ { CLUTTER_EASE_OUT_CIRC, _clutter_ease_out_circ },
+ { CLUTTER_EASE_IN_OUT_CIRC, _clutter_ease_in_out_circ },
+ { CLUTTER_EASE_IN_ELASTIC, _clutter_ease_in_elastic },
+ { CLUTTER_EASE_OUT_ELASTIC, _clutter_ease_out_elastic },
+ { CLUTTER_EASE_IN_OUT_ELASTIC, _clutter_ease_in_out_elastic },
+ { CLUTTER_EASE_IN_BACK, _clutter_ease_in_back },
+ { CLUTTER_EASE_OUT_BACK, _clutter_ease_out_back },
+ { CLUTTER_EASE_IN_OUT_BACK, _clutter_ease_in_out_back },
+ { CLUTTER_EASE_IN_BOUNCE, _clutter_ease_in_bounce },
+ { CLUTTER_EASE_OUT_BOUNCE, _clutter_ease_out_bounce },
+ { CLUTTER_EASE_IN_OUT_BOUNCE, _clutter_ease_in_out_bounce },
{ CLUTTER_ANIMATION_LAST, NULL },
};
@@ -1245,6 +787,19 @@ typedef struct _AlphaData {
static GPtrArray *clutter_alphas = NULL;
+static gdouble
+clutter_alpha_easing (ClutterAlpha *alpha,
+ gpointer data)
+{
+ ClutterTimeline *timeline = alpha->priv->timeline;
+ gdouble (* easing_func) (gdouble, gdouble) = data;
+
+ g_assert (easing_func != NULL);
+
+ return easing_func (clutter_timeline_get_elapsed_time (timeline),
+ clutter_timeline_get_duration (timeline));
+}
+
/**
* clutter_alpha_set_mode:
* @alpha: a #ClutterAlpha
diff --git a/clutter/clutter-easing.c b/clutter/clutter-easing.c
new file mode 100644
index 0000000..a7452f3
--- /dev/null
+++ b/clutter/clutter-easing.c
@@ -0,0 +1,380 @@
+#include "config.h"
+
+#include "clutter-easing.h"
+
+#include <math.h>
+
+double
+_clutter_linear (double t,
+ double d)
+{
+ return t / d;
+}
+
+double
+_clutter_ease_in_quad (double t,
+ double d)
+{
+ double p = t / d;
+
+ return p * p;
+}
+
+double
+_clutter_ease_out_quad (double t,
+ double d)
+{
+ double p = t / d;
+
+ return -1.0 * p * (p - 2);
+}
+
+double
+_clutter_ease_in_out_quad (double t,
+ double d)
+{
+ double p = t / (d / 2);
+
+ if (p < 1)
+ return 0.5 * p * p;
+
+ p -= 1;
+
+ return -0.5 * (p * (p - 2) - 1);
+}
+
+double
+_clutter_ease_in_cubic (double t,
+ double d)
+{
+ double p = t / d;
+
+ return p * p * p;
+}
+
+double
+_clutter_ease_out_cubic (double t,
+ double d)
+{
+ double p = t / d - 1;
+
+ return p * p * p + 1;
+}
+
+double
+_clutter_ease_in_out_cubic (double t,
+ double d)
+{
+ double p = t / (d / 2);
+
+ if (p < 1)
+ return 0.5 * p * p * p;
+
+ p -= 2;
+
+ return 0.5 * (p * p * p + 2);
+}
+
+double
+_clutter_ease_in_quart (double t,
+ double d)
+{
+ double p = t / d;
+
+ return p * p * p * p;
+}
+
+double
+_clutter_ease_out_quart (double t,
+ double d)
+{
+ double p = t / d - 1;
+
+ return -1.0 * (p * p * p * p - 1);
+}
+
+double
+_clutter_ease_in_out_quart (double t,
+ double d)
+{
+ double p = t / (d / 2);
+
+ if (p < 1)
+ return 0.5 * p * p * p * p;
+
+ p -= 2;
+
+ return -0.5 * (p * p * p * p - 2);
+}
+
+double
+_clutter_ease_in_quint (double t,
+ double d)
+ {
+ double p = t / d;
+
+ return p * p * p * p * p;
+}
+
+double
+_clutter_ease_out_quint (double t,
+ double d)
+{
+ double p = t / d - 1;
+
+ return p * p * p * p * p + 1;
+}
+
+double
+_clutter_ease_in_out_quint (double t,
+ double d)
+{
+ double p = t / (d / 2);
+
+ if (p < 1)
+ return 0.5 * p * p * p * p * p;
+
+ p -= 2;
+
+ return 0.5 * (p * p * p * p * p + 2);
+}
+
+double
+_clutter_ease_in_sine (double t,
+ double d)
+{
+ return -1.0 * cos (t / d * G_PI_2) + 1.0;
+}
+
+double
+_clutter_ease_out_sine (double t,
+ double d)
+{
+ return sin (t / d * G_PI_2);
+}
+
+double
+_clutter_ease_in_out_sine (double t,
+ double d)
+{
+ return -0.5 * (cos (G_PI * t / d) - 1);
+}
+
+double
+_clutter_ease_in_expo (double t,
+ double d)
+{
+ return (t == 0) ? 0.0 : pow (2, 10 * (t / d - 1));
+}
+
+double
+_clutter_ease_out_expo (double t,
+ double d)
+{
+ return (t == d) ? 1.0 : -pow (2, -10 * t / d) + 1;
+}
+
+double
+_clutter_ease_in_out_expo (double t,
+ double d)
+{
+ double p;
+
+ if (t == 0)
+ return 0.0;
+
+ if (t == d)
+ return 1.0;
+
+ p = t / (d / 2);
+
+ if (p < 1)
+ return 0.5 * pow (2, 10 * (p - 1));
+
+ p -= 1;
+
+ return 0.5 * (-pow (2, -10 * p) + 2);
+}
+
+double
+_clutter_ease_in_circ (double t,
+ double d)
+{
+ double p = t / d;
+
+ return -1.0 * (sqrt (1 - p * p) - 1);
+}
+
+double
+_clutter_ease_out_circ (double t,
+ double d)
+{
+ double p = t / d - 1;
+
+ return sqrt (1 - p * p);
+}
+
+double
+_clutter_ease_in_out_circ (double t,
+ double d)
+{
+ double p = t / (d / 2);
+
+ if (p < 1)
+ return -0.5 * (sqrt (1 - p * p) - 1);
+
+ p -= 2;
+
+ return 0.5 * (sqrt (1 - p * p) + 1);
+}
+
+double
+_clutter_ease_in_elastic (double t,
+ double d)
+{
+ double p = d * .3;
+ double s = p / 4;
+ double q = t / d;
+
+ if (q == 1)
+ return 1.0;
+
+ q -= 1;
+
+ return -(pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
+}
+
+double
+_clutter_ease_out_elastic (double t,
+ double d)
+{
+ double p = d * .3;
+ double s = p / 4;
+ double q = t / d;
+
+ if (q == 1)
+ return 1.0;
+
+ return pow (2, -10 * q) * sin ((q * d - s) * (2 * G_PI) / p) + 1.0;
+}
+
+double
+_clutter_ease_in_out_elastic (double t,
+ double d)
+{
+ double p = d * (.3 * 1.5);
+ double s = p / 4;
+ double q = t / (d / 2);
+
+ if (q == 2)
+ return 1.0;
+
+ if (q < 1)
+ {
+ q -= 1;
+
+ return -.5 * (pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
+ }
+ else
+ {
+ q -= 1;
+
+ return pow (2, -10 * q)
+ * sin ((q * d - s) * (2 * G_PI) / p)
+ * .5 + 1.0;
+ }
+}
+
+double
+_clutter_ease_in_back (double t,
+ double d)
+{
+ double p = t / d;
+
+ return p * p * ((1.70158 + 1) * p - 1.70158);
+}
+
+double
+_clutter_ease_out_back (double t,
+ double d)
+{
+ double p = t / d - 1;
+
+ return p * p * ((1.70158 + 1) * p + 1.70158) + 1;
+}
+
+double
+_clutter_ease_in_out_back (double t,
+ double d)
+{
+ double p = t / (d / 2);
+ double s = 1.70158 * 1.525;
+
+ if (p < 1)
+ return 0.5 * (p * p * ((s + 1) * p - s));
+
+ p -= 2;
+
+ return 0.5 * (p * p * ((s + 1) * p + s) + 2);
+}
+
+static inline double
+ease_out_bounce_internal (double t,
+ double d)
+{
+ double p = t / d;
+
+ if (p < (1 / 2.75))
+ {
+ return 7.5625 * p * p;
+ }
+ else if (p < (2 / 2.75))
+ {
+ p -= (1.5 / 2.75);
+
+ return 7.5625 * p * p + .75;
+ }
+ else if (p < (2.5 / 2.75))
+ {
+ p -= (2.25 / 2.75);
+
+ return 7.5625 * p * p + .9375;
+ }
+ else
+ {
+ p -= (2.625 / 2.75);
+
+ return 7.5625 * p * p + .984375;
+ }
+}
+
+static inline double
+ease_in_bounce_internal (double t,
+ double d)
+{
+ return 1.0 - ease_out_bounce_internal (d - t, d);
+}
+
+double
+_clutter_ease_in_bounce (double t,
+ double d)
+{
+ return ease_in_bounce_internal (t, d);
+}
+
+double
+_clutter_ease_out_bounce (double t,
+ double d)
+{
+ return ease_out_bounce_internal (t, d);
+}
+
+double
+_clutter_ease_in_out_bounce (double t,
+ double d)
+{
+ if (t < d / 2)
+ return ease_in_bounce_internal (t * 2, d) * 0.5;
+ else
+ return ease_out_bounce_internal (t * 2 - d, d) * 0.5 + 1.0 * 0.5;
+}
diff --git a/clutter/clutter-easing.h b/clutter/clutter-easing.h
new file mode 100644
index 0000000..bcd044a
--- /dev/null
+++ b/clutter/clutter-easing.h
@@ -0,0 +1,73 @@
+#ifndef __CLUTTER_EASING_H__
+#define __CLUTTER_EASING_H__
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+double _clutter_linear (double t,
+ double d);
+double _clutter_ease_in_quad (double t,
+ double d);
+double _clutter_ease_out_quad (double t,
+ double d);
+double _clutter_ease_in_out_quad (double t,
+ double d);
+double _clutter_ease_in_cubic (double t,
+ double d);
+double _clutter_ease_out_cubic (double t,
+ double d);
+double _clutter_ease_in_out_cubic (double t,
+ double d);
+double _clutter_ease_in_quart (double t,
+ double d);
+double _clutter_ease_out_quart (double t,
+ double d);
+double _clutter_ease_in_out_quart (double t,
+ double d);
+double _clutter_ease_in_quint (double t,
+ double d);
+double _clutter_ease_out_quint (double t,
+ double d);
+double _clutter_ease_in_out_quint (double t,
+ double d);
+double _clutter_ease_in_sine (double t,
+ double d);
+double _clutter_ease_out_sine (double t,
+ double d);
+double _clutter_ease_in_out_sine (double t,
+ double d);
+double _clutter_ease_in_expo (double t,
+ double d);
+double _clutter_ease_out_expo (double t,
+ double d);
+double _clutter_ease_in_out_expo (double t,
+ double d);
+double _clutter_ease_in_circ (double t,
+ double d);
+double _clutter_ease_out_circ (double t,
+ double d);
+double _clutter_ease_in_out_circ (double t,
+ double d);
+double _clutter_ease_in_elastic (double t,
+ double d);
+double _clutter_ease_out_elastic (double t,
+ double d);
+double _clutter_ease_in_out_elastic (double t,
+ double d);
+double _clutter_ease_in_back (double t,
+ double d);
+double _clutter_ease_out_back (double t,
+ double d);
+double _clutter_ease_in_out_back (double t,
+ double d);
+double _clutter_ease_in_bounce (double t,
+ double d);
+double _clutter_ease_out_bounce (double t,
+ double d);
+double _clutter_ease_in_out_bounce (double t,
+ double d);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_EASING_H__ */
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