/* 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 .
*
* Copyright 2009 Øyvind Kolås
*/
#include "config.h"
#include
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_int_ui (levels, _("Levels"), 1, 64, 8, 1, 64, 2,
_("number of levels per component"))
#else
#define GEGL_CHANT_TYPE_POINT_FILTER
#define GEGL_CHANT_C_FILE "posterize.c"
#define GEGLV4
#include "gegl-chant.h"
#ifndef RINT
#define RINT(a) ((gint)(a+0.5))
#endif
static gboolean process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat levels = o->levels;
while (samples--)
{
gint i;
for (i=0; i < 3; i++)
dest[i] = RINT (src[i] * levels) / levels;
dest[3] = src[3];
src += 4;
dest += 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:posterize",
"categories" , "color",
"description",
_("Reduces the number of levels in each color component of the image."),
NULL);
}
#endif