/* 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>

 * Copyright 2006 Geert Jordaens <geert.jordaens@telenet.be>

 */

#include "config.h"

#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

gegl_chant_string (values, _("Values"), "", _("list of <number>s"))

#else

#define GEGL_CHANT_TYPE_POINT_FILTER

#define GEGL_CHANT_C_FILE       "svg-luminancetoalpha.c"

#include "gegl-chant.h"

#include <math.h>

#include <stdlib.h>

static void prepare (GeglOperation *operation)

{

  const Babl *format = babl_format ("RaGaBaA float");

  gegl_operation_set_format (operation, "input", format);

  gegl_operation_set_format (operation, "output", format);

}

static gboolean

process (GeglOperation       *op,

         void                *in_buf,

         void                *out_buf,

         glong                n_pixels,

         const GeglRectangle *roi,

         gint                 level)

{

  gfloat      *in = in_buf;

  gfloat      *out = out_buf;

  gfloat      *m;

  gfloat ma[25] = { 0.0,      0.0,      0.0,     0.0, 0.0,

                    0.0,      0.0,      0.0,     0.0, 0.0,

                    0.0,      0.0,      0.0,     0.0, 0.0,

                    0.2125,   0.7154,   0.0721,  0.0, 0.0,

                    0.0,      0.0,      0.0,     0.0, 1.0};

  glong        i;

  m = ma;

  for (i=0; i

    {

      out[0] =  m[0]  * in[0] +  m[1]  * in[1] + m[2]  * in[2] + m[3]  * in[3] + m[4];

      out[1] =  m[5]  * in[0] +  m[6]  * in[1] + m[7]  * in[2] + m[8]  * in[3] + m[9];

      out[2] =  m[10] * in[0] +  m[11] * in[1] + m[12] * in[2] + m[13] * in[3] + m[14];

      out[3] =  m[15] * in[0] +  m[16] * in[1] + m[17] * in[2] + m[18] * in[3] + m[19];

      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;

  operation_class->prepare = prepare;

  gegl_operation_class_set_keys (operation_class,

    "name"       , "gegl:svg-luminancetoalpha",

    "categories" , "compositors:svgfilter",

    "description",

       _("SVG color matrix operation svg_luminancetoalpha"),

        NULL);

}

#endif