/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
*/
#ifdef GEGL_CHANT_PROPERTIES
/* no properties */
#else
#define GEGL_CHANT_TYPE_POINT_FILTER
#define GEGL_CHANT_C_FILE "unpremul.c"
#define GEGLV4
#include "gegl-chant.h"
static gboolean
process (GeglOperation *op,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
glong i;
gfloat *in = in_buf;
gfloat *out = out_buf;
for (i=0; i<samples; i++)
{
int j;
for (j=0; j<3; j++)
{
if (in[3] != 0)
out[j] = in[j] / in[3];
else
out[j] = 0.0;
}
out[3]=in[3];
in += 4;
out+= 4;
}
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointFilterClass *point_filter_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
point_filter_class->process = process;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:unpremul",
"categories" , "color",
"description" , "Unpremultiplies a buffer that contains pre-multiplied colors (but is marked as not having it)",
NULL);
}
#endif