PIKApp/app/operations/pikaoperationposterize.c

171 lines
5.9 KiB
C

/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikaoperationposterize.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 "libpikabase/pikabase.h"
#include "libpikaconfig/pikaconfig.h"
#include "libpikamath/pikamath.h"
#include "operations-types.h"
#include "pikaoperationposterize.h"
#include "pika-intl.h"
enum
{
PROP_0,
PROP_LEVELS
};
static void pika_operation_posterize_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_operation_posterize_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static gboolean pika_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (PikaOperationPosterize, pika_operation_posterize,
PIKA_TYPE_OPERATION_POINT_FILTER)
#define parent_class pika_operation_posterize_parent_class
static void
pika_operation_posterize_class_init (PikaOperationPosterizeClass *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 = pika_operation_posterize_set_property;
object_class->get_property = pika_operation_posterize_get_property;
point_class->process = pika_operation_posterize_process;
gegl_operation_class_set_keys (operation_class,
"name", "pika:posterize",
"categories", "color",
"description", _("Reduce to a limited set of colors"),
NULL);
PIKA_CONFIG_PROP_INT (object_class, PROP_LEVELS,
"levels",
_("Posterize levels"),
NULL,
2, 256, 3,
PIKA_PARAM_STATIC_STRINGS);
}
static void
pika_operation_posterize_init (PikaOperationPosterize *self)
{
}
static void
pika_operation_posterize_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaOperationPosterize *posterize = PIKA_OPERATION_POSTERIZE (object);
switch (property_id)
{
case PROP_LEVELS:
g_value_set_int (value, posterize->levels);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_operation_posterize_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaOperationPosterize *posterize = PIKA_OPERATION_POSTERIZE (object);
switch (property_id)
{
case PROP_LEVELS:
posterize->levels = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
pika_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
PikaOperationPosterize *posterize = PIKA_OPERATION_POSTERIZE (operation);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat levels;
levels = posterize->levels - 1.0;
while (samples--)
{
dest[RED] = RINT (src[RED] * levels) / levels;
dest[GREEN] = RINT (src[GREEN] * levels) / levels;
dest[BLUE] = RINT (src[BLUE] * levels) / levels;
dest[ALPHA] = RINT (src[ALPHA] * levels) / levels;
src += 4;
dest += 4;
}
return TRUE;
}