gimp/app/gegl/gimpoperationposterize.c

108 lines
3.8 KiB
C

/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationposterize.c
* Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gegl.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "gegl-types.h"
#include "gimpoperationposterize.h"
#include "gimpposterizeconfig.h"
static gboolean gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples);
G_DEFINE_TYPE (GimpOperationPosterize, gimp_operation_posterize,
GIMP_TYPE_OPERATION_POINT_FILTER)
#define parent_class gimp_operation_posterize_parent_class
static void
gimp_operation_posterize_class_init (GimpOperationPosterizeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
object_class->set_property = gimp_operation_point_filter_set_property;
object_class->get_property = gimp_operation_point_filter_get_property;
operation_class->name = "gimp-posterize";
operation_class->categories = "color";
operation_class->description = "GIMP Posterize operation";
point_class->process = gimp_operation_posterize_process;
g_object_class_install_property (object_class,
GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
g_param_spec_object ("config",
"Config",
"The config object",
GIMP_TYPE_POSTERIZE_CONFIG,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_operation_posterize_init (GimpOperationPosterize *self)
{
}
static gboolean
gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpPosterizeConfig *config = GIMP_POSTERIZE_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat levels;
if (! config)
return FALSE;
levels = config->levels - 1.0;
while (samples--)
{
dest[RED_PIX] = RINT (src[RED_PIX] * levels) / levels;
dest[GREEN_PIX] = RINT (src[GREEN_PIX] * levels) / levels;
dest[BLUE_PIX] = RINT (src[BLUE_PIX] * levels) / levels;
dest[ALPHA_PIX] = src[ALPHA_PIX];
src += 4;
dest += 4;
}
return TRUE;
}