[Gegl-developer] Proposition : GeglInterpolator

[Geert Jordaens]

In order not to rewrite interpolation fnctionality for every operation I 
would like to propose following API.

GeglInterpolator
+- GeglInterpolatorLinear
| 
+ GeglInterpolatorCubic
| 
+ GeglInterpolatorLanczos

usage :

/* first create the interpolator */
GeglInterpolatorLinear *interpolator = g_object_new 
(GEGL_TYPE_INTERPLATOR_LINEAR,
                                                    "source", buffer,
                                                    "format", 
babl_format ("RaGaBaA float"),
                                                    NULL);


gegl_interpolator_prepare(interpolator); /* prepares a linear buffer in 
the format suitable for the interpolation routine. */

gegl_interpolator_get(interpolator, x, y, dst); /* returns a 
interpolated pixel in dst */

x,y = source coördinates type double
dst = interpolate pixel in format specified by "format" property.

Please comment on this, untested code can be found at  : 
http://users.telenet.be/geert.jordaens/gegl_interpolator

Geert
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