#!/usr/bin/env ruby

# encoding: utf-8

copyright = '

/* !!!! AUTOGENERATED FILE generated by svg-12-porter-duff.rb !!!!!

 *

 * 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, 2007 Øyvind Kolås <pippin@gimp.org>

 *            2007 John Marshall

 *

 * SVG rendering modes; see:

 *     http://www.w3.org/TR/SVG12/rendering.html

 *     http://www.w3.org/TR/2004/WD-SVG12-20041027/rendering.html#comp-op-prop

 *

 *     aA = aux(src) alpha      aB = in(dst) alpha      aD = out alpha

 *     cA = aux(src) colour     cB = in(dst) colour     cD = out colour

 *

 * !!!! AUTOGENERATED FILE !!!!!

 */'

a = [

      ['clear',         '0.0f',

                        '0.0f'],

      ['src',           'cA',

                        'aA'],

      ['dst',           'cB',

                        'aB'],

#      ['src_over',      'cA + cB * (1.0f - aA)',

#                        'aA + aB - aA * aB'],

      ['dst_over',      'cB + cA * (1.0f - aB)',

                        'aA + aB - aA * aB'],

      ['dst_in',        'cB * aA', # <- XXX: typo?

                        'aA * aB'],

      ['src_out',       'cA * (1.0f - aB)',

                        'aA * (1.0f - aB)'],

      ['dst_out',       'cB * (1.0f - aA)',

                        'aB * (1.0f - aA)'],

      ['src_atop',      'cA * aB + cB * (1.0f - aA)',

                        'aB'],

      ['dst_atop',      'cB * aA + cA * (1.0f - aB)',

                        'aA'],

      ['xor',           'cA * (1.0f - aB)+ cB * (1.0f - aA)',

                        'aA + aB - 2.0f * aA * aB'],

    ]

b = [ ['src_in',        'cA * aB',  # the bounding box of this mode is the

                        'aA * aB']]  # bounding box of the input only.

file_head1 = '

#include "config.h"

#include <glib/gi18n-lib.h>

#ifdef GEGL_CHANT_PROPERTIES

/* no properties */

#else

'

file_head2 = '

static void prepare (GeglOperation *operation)

{

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

  gegl_operation_set_format (operation, "input", format);

  gegl_operation_set_format (operation, "aux", format);

  gegl_operation_set_format (operation, "output", format);

}

static gboolean

process (GeglOperation        *op,

          void                *in_buf,

          void                *aux_buf,

          void                *out_buf,

          glong                n_pixels,

          const GeglRectangle *roi,

          gint                 level)

{

  gint i;

  gfloat * GEGL_ALIGNED in = in_buf;

  gfloat * GEGL_ALIGNED aux = aux_buf;

  gfloat * GEGL_ALIGNED out = out_buf;

  if (aux==NULL)

    return TRUE;

'

file_tail1 = '

static void

gegl_chant_class_init (GeglChantClass *klass)

{

  GeglOperationClass              *operation_class;

  GeglOperationPointComposerClass *point_composer_class;

  operation_class      = GEGL_OPERATION_CLASS (klass);

  point_composer_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);

  point_composer_class->process = process;

  operation_class->prepare = prepare;

'

file_tail2 = ' 

}

#endif

'

a.each do

    |item|

    name     = item[0] + ''

    name.gsub!(/_/, '-')

    filename = name + '.c'

    puts "generating #{filename}"

    file = File.open(filename, 'w')

    capitalized = name.capitalize

    swapcased   = name.swapcase

    c_formula   = item[1]

    a_formula   = item[2]

    file.write copyright

    file.write file_head1

    file.write "

#define GEGL_CHANT_TYPE_POINT_COMPOSER

#define GEGL_CHANT_C_FILE        \"#{filename}\"

#include \"gegl-chant.h\"

"

    file.write file_head2

    file.write "

  for (i = 0; i < n_pixels; i++)

    {

      gint   j;

      gfloat aA G_GNUC_UNUSED, aB G_GNUC_UNUSED, aD G_GNUC_UNUSED;

      aB = in[3];

      aA = aux[3];

      aD = #{a_formula};

      for (j = 0; j < 3; j++)

        {

          gfloat cA G_GNUC_UNUSED, cB G_GNUC_UNUSED;

          cB = in[j];

          cA = aux[j];

          out[j] = #{c_formula};

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

  return TRUE;

}

"

  file.write file_tail1

  file.write "

  operation_class->compat_name = \"gegl:#{name}\";

  gegl_operation_class_set_keys (operation_class,

    \"name\"      , \"svg:#{name}\",

    \"categories\", \"compositors:porter-duff\",

    \"description\",

        _(\"Porter Duff operation #{name} (d = #{c_formula})\"),

        NULL);

"

  file.write file_tail2

  file.close

end

b.each do

    |item|

    name     = item[0] + ''

    name.gsub!(/_/, '-')

    filename = name + '.c'

    puts "generating #{filename}"

    file = File.open(filename, 'w')

    capitalized = name.capitalize

    swapcased   = name.swapcase

    c_formula   = item[1]

    a_formula   = item[2]

    file.write copyright

    file.write file_head1

    file.write "

#define GEGL_CHANT_TYPE_POINT_COMPOSER

#define GEGL_CHANT_C_FILE        \"#{filename}\"

#include \"gegl-chant.h\"

"

    file.write file_head2

    file.write "

  for (i = 0; i < n_pixels; i++)

    {

      gint   j;

      gfloat aA G_GNUC_UNUSED, aB G_GNUC_UNUSED, aD G_GNUC_UNUSED;

      aB = in[3];

      aA = aux[3];

      aD = #{a_formula};

      for (j = 0; j < 3; j++)

        {

          gfloat cA G_GNUC_UNUSED, cB G_GNUC_UNUSED;

          cB = in[j];

          cA = aux[j];

          out[j] = #{c_formula};

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

  return TRUE;

}

static GeglRectangle get_bounding_box (GeglOperation *self)

{

  GeglRectangle *in_rect = gegl_operation_source_get_bounding_box (self, \"input\");

  return *in_rect;

}

"

  file.write file_tail1

  file.write "

  operation_class->compat_name = \"gegl:#{name}\";

  gegl_operation_class_set_keys (operation_class,

  \"name\"      , \"svg:#{name}\",

  \"get_bounding_box\" , get_bounding_box,

  \"categories\", \"compositors:porter-duff\",

  \"description\" ,

        _(\"Porter Duff operation #{name} (d = #{c_formula})\"),

        NULL);

"

  file.write file_tail2

  file.close

end