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[animation] Move the alpha value to floating point

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The current Alpha value is an unsigned integer that can be used
implicitly as a fixed point value. This makes writing an alpha
function overshooting below and above the current range basically
impossible without complicating an already complex code, and
creating weird corner cases.

For this reason, the Alpha value should be defined as a floating
point normalized value, spanning a range between 0.0 and 1.0; in
order to allow overshooting, the valid range is extended one unit
below and one unit above, thus making it -1.0 .. 2.0.

This commit updates the various users of the ClutterAlpha API
and the tests cases.

This commit also removes all the current alpha functions exposed
in the public API.
This commit is contained in:
Emmanuele Bassi
2009-01-20 16:42:49 +00:00
parent 6d4cd416ec
commit 7d7372af43
18 changed files with 107 additions and 1050 deletions
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7
clutter/clutter-behaviour-path.c
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@ -123,7 +123,7 @@ actor_apply_knot_foreach (ClutterBehaviour *behaviour,
static void
clutter_behaviour_path_alpha_notify (ClutterBehaviour *behave,
guint32 alpha_value)
gdouble alpha_value)
{
ClutterBehaviourPath *pathb = CLUTTER_BEHAVIOUR_PATH (behave);
ClutterBehaviourPathPrivate *priv = pathb->priv;
@ -131,10 +131,7 @@ clutter_behaviour_path_alpha_notify (ClutterBehaviour *behave,
guint knot_num;
if (priv->path)
knot_num = clutter_path_get_position (priv->path,
alpha_value
/ (gdouble) CLUTTER_ALPHA_MAX_ALPHA,
&position);
knot_num = clutter_path_get_position (priv->path, alpha_value, &position);
else
{
memset (&position, 0, sizeof (position));