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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationthreshold.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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
#include "operations-types.h"
#include "gimpoperationthreshold.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_CHANNEL,
PROP_LOW,
PROP_HIGH
};
static void gimp_operation_threshold_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_operation_threshold_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static gboolean gimp_operation_threshold_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (GimpOperationThreshold, gimp_operation_threshold,
GIMP_TYPE_OPERATION_POINT_FILTER)
#define parent_class gimp_operation_threshold_parent_class
static void
gimp_operation_threshold_class_init (GimpOperationThresholdClass *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_threshold_set_property;
object_class->get_property = gimp_operation_threshold_get_property;
point_class->process = gimp_operation_threshold_process;
gegl_operation_class_set_keys (operation_class,
"name", "gimp:threshold",
"categories", "color",
"description", _("Reduce image to two colors using a threshold"),
NULL);
GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
"channel",
_("Channel"),
NULL,
GIMP_TYPE_HISTOGRAM_CHANNEL,
GIMP_HISTOGRAM_VALUE,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW,
"low",
_("Low threshold"),
NULL,
0.0, 1.0, 0.5,
GIMP_PARAM_STATIC_STRINGS);
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH,
"high",
_("High threshold"),
NULL,
0.0, 1.0, 1.0,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_operation_threshold_init (GimpOperationThreshold *self)
{
}
static void
gimp_operation_threshold_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
switch (property_id)
{
case PROP_CHANNEL:
g_value_set_enum (value, self->channel);
break;
case PROP_LOW:
g_value_set_double (value, self->low);
break;
case PROP_HIGH:
g_value_set_double (value, self->high);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_operation_threshold_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpOperationThreshold *self = GIMP_OPERATION_THRESHOLD (object);
switch (property_id)
{
case PROP_CHANNEL:
self->channel = g_value_get_enum (value);
break;
case PROP_LOW:
self->low = g_value_get_double (value);
break;
case PROP_HIGH:
self->high = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gimp_operation_threshold_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationThreshold *threshold = GIMP_OPERATION_THRESHOLD (operation);
gfloat *src = in_buf;
gfloat *dest = out_buf;
while (samples--)
{
gfloat value = 0.0;
switch (threshold->channel)
{
case GIMP_HISTOGRAM_VALUE:
value = MAX (src[RED], src[GREEN]);
value = MAX (value, src[BLUE]);
break;
case GIMP_HISTOGRAM_RED:
value = src[RED];
break;
case GIMP_HISTOGRAM_GREEN:
value = src[GREEN];
break;
case GIMP_HISTOGRAM_BLUE:
value = src[BLUE];
break;
case GIMP_HISTOGRAM_ALPHA:
value = src[ALPHA];
break;
case GIMP_HISTOGRAM_RGB:
value = MIN (src[RED], src[GREEN]);
value = MIN (value, src[BLUE]);
break;
case GIMP_HISTOGRAM_LUMINANCE:
value = GIMP_RGB_LUMINANCE (src[RED], src[GREEN], src[BLUE]);
break;
}
value = (value >= threshold->low && value <= threshold->high) ? 1.0 : 0.0;
dest[RED] = value;
dest[GREEN] = value;
dest[BLUE] = value;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
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