operations/common/hue-chroma.c

   1 /* This file is an image processing operation for GEGL
   2  *
   3  * GEGL is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 3 of the License, or (at your option) any later version.
   7  *
   8  * GEGL is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with GEGL; if not, see <https://www.gnu.org/licenses/>.
  15  *
  16  * Copyright 2017 Elle Stone <ellestone@ninedegreesbelow.com>
  17  *                Michael Natterer <mitch@gimp.org>
  18  */
  19
  20 #include "config.h"
  21 #include <glib/gi18n-lib.h>
  22
  23 #ifdef GEGL_PROPERTIES
  24
  25 property_double (hue, _("Hue"),  0.0)
  26    description  (_("Hue adjustment"))
  27    value_range  (-180.0, 180.0)
  28
  29 property_double (chroma, _("Chroma"), 0.0)
  30    description  (_("Chroma adjustment"))
  31    value_range  (-100.0, 100.0)
  32
  33 property_double (lightness, _("Lightness"), 0.0)
  34    description  (_("Lightness adjustment"))
  35    value_range  (-100.0, 100.0)
  36
  37 #else
  38
  39 #define GEGL_OP_POINT_FILTER
  40
  41 #define GEGL_OP_NAME     hue_chroma
  42 #define GEGL_OP_C_SOURCE hue-chroma.c
  43
  44 #include "gegl-op.h"
  45
  46 #define EPSILON     1e-4f
  47
  48 static void
  49 prepare (GeglOperation *operation)
  50 {
  51   const Babl *space = gegl_operation_get_source_space (operation, "input");
  52   gegl_operation_set_format (operation, "input",
  53                    babl_format_with_space ("CIE LCH(ab) alpha float", space));
  54   gegl_operation_set_format (operation, "output",
  55                    babl_format_with_space ("CIE LCH(ab) alpha float", space));
  56 }
  57
  58 static gboolean
  59 process (GeglOperation       *op,
  60          void                *in_buf,
  61          void                *out_buf,
  62          glong                n_pixels,
  63          const GeglRectangle *roi,
  64          gint                 level)
  65 {
  66   GeglProperties *o = GEGL_PROPERTIES (op);
  67   gfloat         *GEGL_ALIGNED in_pixel;
  68   gfloat         *GEGL_ALIGNED out_pixel;
  69   gfloat          hue;
  70   gfloat          chroma;
  71   gfloat          lightness;
  72
  73   in_pixel   = in_buf;
  74   out_pixel  = out_buf;
  75
  76   hue       = o->hue;
  77   chroma    = o->chroma;
  78   lightness = o->lightness;
  79
  80   while (n_pixels--)
  81     {
  82       if ((fabsf(in_pixel[1])>EPSILON))
  83         {
  84           out_pixel[0] = in_pixel[0] + lightness;
  85           out_pixel[1] = in_pixel[1] + chroma;
  86           out_pixel[2] = in_pixel[2] + hue;
  87         }
  88       else
  89         {
  90           out_pixel[0] = in_pixel[0] + lightness;
  91           out_pixel[1] = in_pixel[1];
  92           out_pixel[2] = in_pixel[2];
  93         }
  94
  95       out_pixel[1] = CLAMP (out_pixel[1], 0, 300.0);
  96       out_pixel[3] = in_pixel[3];
  97
  98       in_pixel  += 4;
  99       out_pixel += 4;
 100     }
 101   return TRUE;
 102 }
 103
 104 #include "opencl/hue-chroma.cl.h"
 105
 106 static void
 107 gegl_op_class_init (GeglOpClass *klass)
 108 {
 109   GeglOperationClass            *operation_class;
 110   GeglOperationPointFilterClass *point_filter_class;
 111
 112   operation_class    = GEGL_OPERATION_CLASS (klass);
 113   point_filter_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
 114
 115   operation_class->prepare    = prepare;
 116   point_filter_class->process = process;
 117
 118   gegl_operation_class_set_keys (operation_class,
 119       "name",           "gegl:hue-chroma",
 120       "title",          _("Hue-Chroma"),
 121       "categories",     "color",
 122       "reference-hash", "ffb9e86edb25bc92e8d4e68f59bbb04b",
 123       "cl-source",      hue_chroma_cl_source,
 124       "description",    _("Adjust LCH Hue, Chroma, and Lightness"),
 125       NULL);
 126 }
 127
 128 #endif