• Emmanuele Bassi's avatar
    [animation] Move the alpha value to floating point · 7d7372af
    Emmanuele Bassi authored
    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.
    7d7372af
clutter-alpha.c 18.1 KB