/* 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 (C) 2011 Barak Itkin <lightningismyname@gmail.org>
*
* Based on "Maximum RGB" GIMP plugin
* Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
* Copyright (C) 2000 tim copperfield <timecop@japan.co.jp>
*
* The common/brightness-contrast.c operation by Øyvind Kolås was used
* as a template for this op file.
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_boolean (min, _("Minimal"), FALSE,
_("Hold the minimal values instead of the maximal values"))
#else
#define GEGL_CHANT_TYPE_POINT_FILTER
#define GEGL_CHANT_C_FILE "max-rgb.c"
#include "gegl-chant.h"
static void prepare (GeglOperation *operation)
{
gegl_operation_set_format (operation, "input", babl_format ("RGBA float"));
gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
}
static gboolean
process (GeglOperation *op,
void *in_buf,
void *out_buf,
glong n_pixels,
const GeglRectangle *roi,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (op);
gfloat * GEGL_ALIGNED in_pixel;
gfloat * GEGL_ALIGNED out_pixel;
gfloat val;
glong i;
in_pixel = in_buf;
out_pixel = out_buf;
/* The code could be compacted by inserting the if into the loop, but
* it's more efficient if we do it like this. Note also that in cases
* of equality between the maximal/minimal channels, we want to keep
* them all.
*/
if (!o->min)
{
for (i=0; i<n_pixels; i++)
{
val = MAX (in_pixel[0], MAX (in_pixel[1], in_pixel[2]));
out_pixel[0] = (in_pixel[0] == val) ? val : 0;
out_pixel[1] = (in_pixel[1] == val) ? val : 0;
out_pixel[2] = (in_pixel[2] == val) ? val : 0;
out_pixel[3] = in_pixel[3]; /* copy the alpha */
in_pixel += 4;
out_pixel += 4;
}
}
else
{
for (i=0; i<n_pixels; i++)
{
val = MIN (in_pixel[0], MIN (in_pixel[1], in_pixel[2]));
out_pixel[0] = (in_pixel[0] == val) ? val : 0;
out_pixel[1] = (in_pixel[1] == val) ? val : 0;
out_pixel[2] = (in_pixel[2] == val) ? val : 0;
out_pixel[3] = in_pixel[3]; /* copy the alpha */
in_pixel += 4;
out_pixel += 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);
operation_class->prepare = prepare;
point_filter_class->process = process;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:max-rgb",
"categories" , "color",
"description" , _("Reduce image to pure red, green, and blue"),
NULL);
}
#endif