gimp/app/operations/gimpoperationposterize.c

180 lines
6.1 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 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 "libgimpbase/gimpbase.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpmath/gimpmath.h"
#include "operations-types.h"
#include "gimpoperationposterize.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_LEVELS
};
static void gimp_operation_posterize_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_operation_posterize_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_operation_posterize_prepare (GeglOperation *operation);
static gboolean gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
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_posterize_set_property;
object_class->get_property = gimp_operation_posterize_get_property;
operation_class->prepare = gimp_operation_posterize_prepare;
point_class->process = gimp_operation_posterize_process;
gegl_operation_class_set_keys (operation_class,
"name", "gimp:posterize",
"categories", "color",
"description", _("Reduce to a limited set of colors"),
NULL);
GIMP_CONFIG_PROP_INT (object_class, PROP_LEVELS,
"levels",
_("Posterize levels"),
NULL,
2, 256, 3,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_operation_posterize_init (GimpOperationPosterize *self)
{
}
static void
gimp_operation_posterize_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpOperationPosterize *posterize = GIMP_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
gimp_operation_posterize_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpOperationPosterize *posterize = GIMP_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 void
gimp_operation_posterize_prepare (GeglOperation *operation)
{
const Babl *format = babl_format_with_space ("R~G~B~A float",
gegl_operation_get_format (operation, "input"));
gegl_operation_set_format (operation, "input", format);
gegl_operation_set_format (operation, "output", format);
}
static gboolean
gimp_operation_posterize_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationPosterize *posterize = GIMP_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;
}