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[alpha] Sanitize easing equations

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Bug 1561 - Bad code in clutter-alpha.c

The implementation of the easing modes equations followed closely
the JavaScript and ActionScript counterparts. Obviously, JS and AS
are not C-compatible, so later versions of gcc (4.4.0 for instance)
would complain about uninitialized variables and such. The code is
also obfuscated and hard to debug/understand.

For these reasons, the implementation should be unobfuscated and
sanitized.
This commit is contained in:
Emmanuele Bassi 2009-04-23 11:35:10 +01:00
parent 1d2ac51ea3
commit d6ccecd79e
1 changed files with 108 additions and 49 deletions
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157
clutter/clutter-alpha.c
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@ -605,8 +605,9 @@ clutter_ease_out_quad (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return -1.0 * (t /= d) * (t - 2);
return -1.0 * p * (p - 2);
}
static gdouble
@ -616,11 +617,14 @@ clutter_ease_in_out_quad (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / (d / 2);
if ((t /= d / 2) < 1)
return 0.5 * t * t;
if (p < 1)
return 0.5 * p * p;
return -0.5 * ((--t) * (t - 2) - 1);
p -= 1;
return -0.5 * (p * (p - 2) - 1);
}
static gdouble
@ -630,8 +634,9 @@ clutter_ease_in_cubic (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return (t /= d) * t * t;
return p * p * p;
}
static gdouble
@ -641,8 +646,9 @@ clutter_ease_out_cubic (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d - 1;
return (t = t / d - 1) * t * t + 1;
return p * p * p + 1;
}
static gdouble
@ -652,11 +658,14 @@ clutter_ease_in_out_cubic (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / (d / 2);
if ((t /= d / 2) < 1)
return 0.5 * t * t * t;
if (p < 1)
return 0.5 * p * p * p;
return 0.5 * ((t -= 2) * t * t + 2);
p -= 2;
return 0.5 * (p * p * p + 2);
}
static gdouble
@ -666,8 +675,9 @@ clutter_ease_in_quart (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return (t /= d) * t * t * t;
return p * p * p * p;
}
static gdouble
@ -677,8 +687,9 @@ clutter_ease_out_quart (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d - 1;
return -0.5 * ((t = t / d - 1) * t * t * t - 1);
return -1.0 * (p * p * p * p - 1);
}
static gdouble
@ -688,11 +699,14 @@ clutter_ease_in_out_quart (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / (d / 2);
if ((t /= d / 2) < 1)
return 0.5 * t * t * t * t;
if (p < 1)
return 0.5 * p * p * p * p;
return -0.5 * ((t -= 2) * t * t * t - 2);
p -= 2;
return -0.5 * (p * p * p * p - 2);
}
static gdouble
@ -702,8 +716,9 @@ clutter_ease_in_quint (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return (t /= d) * t * t * t * t;
return p * p * p * p * p;
}
static gdouble
@ -713,8 +728,9 @@ clutter_ease_out_quint (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d - 1;
return (t = t / d - 1) * t * t * t * t + 1;
return p * p * p * p * p + 1;
}
static gdouble
@ -724,11 +740,14 @@ clutter_ease_in_out_quint (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / (d / 2);
if ((t /= d / 2) < 1)
return 0.5 * t * t * t * t * t;
if (p < 1)
return 0.5 * p * p * p * p * p;
return 0.5 * ((t -= 2) * t * t * t * t + 2);
p -= 2;
return 0.5 * (p * p * p * p * p + 2);
}
static gdouble
@ -793,6 +812,7 @@ clutter_ease_in_out_expo (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p;
if (t == 0)
return 0.0;
@ -800,10 +820,14 @@ clutter_ease_in_out_expo (ClutterAlpha *alpha,
if (t == d)
return 1.0;
if ((t /= d / 2) < 1)
return 0.5 * pow (2, 10 * (t - 1));
p = t / (d / 2);
return 0.5 * (-pow (2, -10 * --t) + 2);
if (p < 1)
return 0.5 * pow (2, 10 * (p - 1));
p -= 1;
return 0.5 * (-pow (2, -10 * p) + 2);
}
static gdouble
@ -813,8 +837,9 @@ clutter_ease_in_circ (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return -1.0 * (sqrt (1 - (t /= d) * t) - 1);
return -1.0 * (sqrt (1 - p * p) - 1);
}
static gdouble
@ -824,8 +849,9 @@ clutter_ease_out_circ (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d - 1;
return sqrt (1 - (t = t / d - 1) * t);
return sqrt (1 - p * p);
}
static gdouble
@ -835,11 +861,14 @@ clutter_ease_in_out_circ (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / (d / 2);
if ((t /= d / 2) < 1)
return -0.5 * (sqrt (1 - t * t) - 1);
if (p < 1)
return -0.5 * (sqrt (1 - p * p) - 1);
return 0.5 * (sqrt (1 - (t -= 2) * t) + 1);
p -= 2;
return 0.5 * (sqrt (1 - p * p) + 1);
}
static gdouble
@ -851,11 +880,14 @@ clutter_ease_in_elastic (ClutterAlpha *alpha,
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = d * .3;
gdouble s = p / 4;
gdouble q = t / d;
if ((t /= d) == 1)
if (q == 1)
return 1.0;
return -(pow (2, 10 * (t -= 1)) * sin ((t * d - s) * (2 * G_PI) / p));
q -= 1;
return -(pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
}
static gdouble
@ -867,11 +899,12 @@ clutter_ease_out_elastic (ClutterAlpha *alpha,
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = d * .3;
gdouble s = p / 4;
gdouble q = t / d;
if ((t /= d) == 1)
if (q == 1)
return 1.0;
return pow (2, -10 * t) * sin ((t * d - s) * (2 * G_PI) / p) + 1.0;
return pow (2, -10 * q) * sin ((q * d - s) * (2 * G_PI) / p) + 1.0;
}
static gdouble
@ -883,16 +916,23 @@ clutter_ease_in_out_elastic (ClutterAlpha *alpha,
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = d * (.3 * 1.5);
gdouble s = p / 4;
gdouble q = t / (d / 2);
if ((t /= d / 2) == 2)
if (q == 2)
return 1.0;
if (t < 1)
return -.5 * (pow (2, 10 * (t -= 1)) * sin ((t * d - s) * (2 * G_PI) / p));
if (q < 1)
{
q -= 1;
return -.5 * (pow (2, 10 * q) * sin ((q * d - s) * (2 * G_PI) / p));
}
else
{
return pow (2, -10 * (t -= 1))
* sin ((t * d - s) * (2 * G_PI) / p)
q -= 1;
return pow (2, -10 * q)
* sin ((q * d - s) * (2 * G_PI) / p)
* .5 + 1.0;
}
}
@ -904,8 +944,9 @@ clutter_ease_in_back (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d;
return (t /= d) * t * ((1.70158 + 1) * t - 1.70158);
return p * p * ((1.70158 + 1) * p - 1.70158);
}
static gdouble
@ -915,8 +956,9 @@ clutter_ease_out_back (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble p = t / d - 1;
return (t = t / d - 1) * t * ((1.70158 + 1) * t + 1.70158) + 1;
return p * p * ((1.70158 + 1) * p + 1.70158) + 1;
}
static gdouble
@ -926,26 +968,43 @@ clutter_ease_in_out_back (ClutterAlpha *alpha,
ClutterTimeline *timeline = alpha->priv->timeline;
gdouble t = clutter_timeline_get_current_frame (timeline);
gdouble d = clutter_timeline_get_n_frames (timeline);
gdouble s = 1.70158;
gdouble p = t / (d / 2);
gdouble s = 1.70158 * 1.525;
if ((t /= d / 2) < 1)
return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
if (p < 1)
return 0.5 * (p * p * ((s + 1) * p - s));
return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
p -= 2;
return 0.5 * (p * p * ((s + 1) * p + s) + 2);
}
static gdouble
ease_out_bounce_internal (gdouble t,
gdouble d)
{
if ((t /= d) < (1 / 2.75))
return 7.5625 * t * t;
else if (t < (2 / 2.75))
return 7.5625 * (t -= (1.5 / 2.75)) * t + .75;
else if (t < (2.5 / 2.75))
return 7.5625 * (t -= (2.25 / 2.75)) * t + .9375;
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
return 7.5625 * (t -= (2.625 / 2.75)) * t + .984375;
{
p -= (2.625 / 2.75);
return 7.5625 * p * p + .984375;
}
}
static gdouble