#!/usr/bin/env ruby

copyright = '

/* !!!! AUTOGENERATED FILE generated by svg12-blend.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 = [

      ['multiply',      'cA * cB +  cA * (1 - aB) + cB * (1 - aA)'],

      ['screen',        'cA + cB - cA * cB'],

      ['darken',        'MIN (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA)'],

      ['lighten',       'MAX (cA * aB, cB * aA) + cA * (1 - aB) + cB * (1 - aA)'],

      ['difference',    'cA + cB - 2 * (MIN (cA * aB, cB * aA))'],

      ['exclusion',     '(cA * aB + cB * aA - 2 * cA * cB) + cA * (1 - aB) + cB * (1 - aA)']

    ]

b = [

      ['overlay',       '2 * cB > aB',

                        '2 * cA * cB + cA * (1 - aB) + cB * (1 - aA)',

                        'aA * aB - 2 * (aB - cB) * (aA - cA) + cA * (1 - aB) + cB * (1 - aA)'],

      ['color_dodge',   'cA * aB + cB * aA >= aA * aB',

                        'aA * aB + cA * (1 - aB) + cB * (1 - aA)',

                        '(cA == aA ? 1 : cB * aA / (aA == 0 ? 1 : 1 - cA / aA)) + cA * (1 - aB) + cB * (1 - aA)'],

      ['color_burn',    'cA * aB + cB * aA <= aA * aB',

                        'cA * (1 - aB) + cB * (1 - aA)',

                        '(cA == 0 ? 1 : (aA * (cA * aB + cB * aA - aA * aB) / cA) + cA * (1 - aB) + cB * (1 - aA))'],

      ['hard_light',    '2 * cA < aA',

                        '2 * cA * cB + cA * (1 - aB) + cB * (1 - aA)',

                        'aA * aB - 2 * (aB - cB) * (aA - cA) + cA * (1 - aB) + cB * (1 - aA)']

    ]

c = [

      ['soft_light',    '2 * cA < aA',

                        'cB * (aA - (aB == 0 ? 1 : 1 - cB / aB) * (2 * cA - aA)) + cA * (1 - aB) + cB * (1 - aA)',

                        '8 * cB <= aB',

                        'cB * (aA - (aB == 0 ? 1 : 1 - cB / aB) * (2 * cA - aA) * (aB == 0 ? 3 : 3 - 8 * cB / aB)) + cA * (1 - aB) + cB * (1 - aA)',

                        '(aA * cB + (aB == 0 ? 0 : sqrt (cB / aB) * aB - cB) * (2 * cA - aA)) + cA * (1 - aB) + cB * (1 - aA)']

    ]

d = [

      ['plus',          'cA + cB',

                        'MIN (aA + aB, 1)']

    ]

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)

{

  gfloat * GEGL_ALIGNED in = in_buf;

  gfloat * GEGL_ALIGNED aux = aux_buf;

  gfloat * GEGL_ALIGNED out = out_buf;

  gint    i;

  if (aux==NULL)

    return TRUE;

'

file_tail1 = '

  return TRUE;

}

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 = '  gegl_operation_class_set_key (operation_class, "categories", "compositors:svgfilter");

}

#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

    formula1    = item[1]

    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++)

    {

      gfloat aA, aB, aD;

      gint   j;

      aB = in[3];

      aA = aux[3];

      aD = aA + aB - aA * aB;

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

        {

          gfloat cA, cB;

          cB = in[j];

          cA = aux[j];

          out[j] = CLAMP (#{formula1}, 0, aD);

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

"

  file.write file_tail1

  file.write "

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

  gegl_operation_class_set_keys (operation_class,

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

  \"description\" ,

        _(\"SVG blend operation #{name} (<tt>d = #{formula1}</tt>)\"),

        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

    cond1       = item[1]

    formula1    = item[2]

    formula2    = item[3]

    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++)

    {

      gfloat aA, aB, aD;

      gint   j;

      aB = in[3];

      aA = aux[3];

      aD = aA + aB - aA * aB;

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

        {

          gfloat cA, cB;

          cB = in[j];

          cA = aux[j];

          if (#{cond1})

            out[j] = CLAMP (#{formula1}, 0, aD);

          else

            out[j] = CLAMP (#{formula2}, 0, aD);

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

"

  file.write file_tail1

  file.write "

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

  gegl_operation_class_set_keys (operation_class,

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

  \"description\" ,

        _(\"SVG blend operation #{name} (<tt>if #{cond1}: d = #{formula1} otherwise: d = #{formula2}</tt>)\"),

        NULL);

"

  file.write file_tail2

  file.close

end

c.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

    cond1       = item[1]

    formula1    = item[2]

    cond2       = item[3]

    formula2    = item[4]

    formula3    = item[5]

    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\"

#include <math.h>

"

    file.write file_head2

    file.write "

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

    {

      gfloat aA, aB, aD;

      gint   j;

      aB = in[3];

      aA = aux[3];

      aD = aA + aB - aA * aB;

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

        {

          gfloat cA, cB;

          cB = in[j];

          cA = aux[j];

          if (#{cond1})

            out[j] = CLAMP (#{formula1}, 0, aD);

          else if (#{cond2})

            out[j] = CLAMP (#{formula2}, 0, aD);

          else

            out[j] = CLAMP (#{formula3}, 0, aD);

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

"

  file.write file_tail1

  file.write "

  gegl_operation_class_set_keys (operation_class,

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

  \"description\" ,

        _(\"SVG blend operation #{name} (<tt>if #{cond1}: d = #{formula1}; if #{cond2}: d = #{formula2}; otherwise: d = #{formula3}</tt>)\"),

        NULL);

"

  file.write file_tail2

  file.close

end

d.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

    formula1    = item[1]

    formula2    = 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++)

    {

      gfloat aA, aB, aD;

      gint   j;

      aB = in[3];

      aA = aux[3];

      aD = #{formula2};

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

        {

          gfloat cA, cB;

          cB = in[j];

          cA = aux[j];

          out[j] = CLAMP (#{formula1}, 0, aD);

        }

      out[3] = aD;

      in  += 4;

      aux += 4;

      out += 4;

    }

"

  file.write file_tail1

  file.write "

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

  gegl_operation_class_set_keys (operation_class,

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

    \"description\" ,

    _(\"SVG blend operation #{name} (<tt>d = #{formula1}</tt>)\"),

    NULL);

"

  file.write file_tail2

  file.close

end