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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationsubtractmode.c
* Copyright (C) 2008 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-plugin.h>
#include "gimp-gegl-types.h"
#include "gimpoperationsubtractmode.h"
static gboolean gimp_operation_subtract_mode_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (GimpOperationSubtractMode, gimp_operation_subtract_mode,
GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
static void
gimp_operation_subtract_mode_class_init (GimpOperationSubtractModeClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointComposerClass *point_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
gegl_operation_class_set_keys (operation_class,
"name" , "gimp:subtract-mode",
"description", "GIMP subtract mode operation",
NULL);
point_class->process = gimp_operation_subtract_mode_process;
}
static void
gimp_operation_subtract_mode_init (GimpOperationSubtractMode *self)
{
}
static gboolean
gimp_operation_subtract_mode_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
gfloat *in = in_buf;
gfloat *layer = aux_buf;
gfloat *out = out_buf;
while (samples--)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
out[ALPHA] = in[ALPHA];
in += 4;
layer += 4;
out += 4;
}
return TRUE;
}
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