/* 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 2006-2010 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
/* no properties */
#else
#define GEGL_CHANT_TYPE_POINT_COMPOSER3
#define GEGL_CHANT_C_FILE "remap.c"
#include "gegl-chant.h"
static void prepare (GeglOperation *operation)
{
const Babl *format = babl_format ("RGBA float");
gegl_operation_set_format (operation, "input", format);
gegl_operation_set_format (operation, "aux", format);
gegl_operation_set_format (operation, "aux2", format);
gegl_operation_set_format (operation, "output", format);
}
static gboolean
process (GeglOperation *op,
void *in_buf,
void *min_buf,
void *max_buf,
void *out_buf,
glong n_pixels,
const GeglRectangle *roi,
gint level)
{
gint i;
gfloat *in = in_buf;
gfloat *min = min_buf;
gfloat *max = max_buf;
gfloat *out = out_buf;
for (i = 0; i < n_pixels; i++)
{
gint c;
for (c = 0; c < 3; c++)
{
gfloat delta = max[c]-min[c];
if (delta > 0.0001 || delta < -0.0001)
out[c] = (in[c]-min[c]) / delta;
else
out[c] = in[c];
out[3] = in[3];
}
in += 4;
out += 4;
min += 4;
max += 4;
}
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointComposer3Class *point_composer3_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_composer3_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
operation_class->prepare = prepare;
point_composer3_class->process = process;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:remap",
"description",
_("stretch components of pixels individually based on luminance envelopes"),
"categories" , "compositors:porter-duff",
NULL);
}
#endif