Clutter::Cogl::Color(3) COGL Color representation


Colors in COGL are described as arrays of four values, one for each channel of the RGBA representation.

The values can either be expressed as a byte value, going from 0 to 255, or as normalized floating point values, between 0 and 1.


(red, green, blue, alpha) = Clutter::Cogl::Color->premultiply ($color)

  • $color (array of R, G, B, A values)

Converts a non-premultiplied color to a pre-multiplied color. For example, semi-transparent red is (1.0, 0, 0, 0.5) when non-premultiplied and (0.5, 0, 0, 0.5) when premultiplied.


Copyright (C) 2006, 2007, 2008 OpenedHand Ltd

Copyright (C) 2009 Intel Corporation

This module is free software; you can redistribute it and/or modify it under the terms of either:

  • the GNU Lesser General Public Library version 2.1; or
  • the Artistic License, version 2.0.

See Clutter for the full copyright notice.